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453 results about "Random vibration" patented technology
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In mechanical engineering, random vibration is motion which is non-deterministic, meaning that future behavior cannot be precisely predicted. The randomness is a characteristic of the excitation or input, not the mode shapes or natural frequencies. Some common examples include an automobile riding on a rough road, wave height on the water, or the load induced on an airplane wing during flight. Structural response to random vibration is usually treated using statistical or probabilistic approaches. In mathematical terms, random vibration is characterized as an ergodic and stationary process.
Vibration fatigue life predication method and system for micro-packaging assembly
ActiveCN104268335ASolving the Difficulty of Vibration Fatigue Life PredictionAvoid data difficultiesSpecial data processing applicationsTime domainElement model
The invention provides a vibration fatigue life predication method and system for a micro-packaging assembly. The method comprises the following steps: creating a vibration simulating finite element model according to the structures of the micro-packaging assembly and a fixing part; extracting the verification characteristics parameters; modifying the vibration simulating finite element model according to the verification characteristics parameters and the experimental characteristics parameters of the micro-packaging assembly to obtain a vibration simulating model; performing random vibration stress response simulation analysis for the micro-packaging assembly according to the vibration simulation model to obtain a dangerous vibration fatigue point; extracting equivalent stress power spectrum density of the dangerous vibration fatigue point under the random vibration load; converting the equivalent stress power spectrum density to obtain cyclic stress time domain data; calculating the vibration fatigue life of the dangerous vibration fatigue point under the random vibration load according to an S-N curve and the cyclic stress time domain data of the dangerous vibration fatigue point; predicating the vibration fatigue life of the micro-packaging assembly by the method of synchronously extracting the response data of the fixing part and the micro-packaging assembly. With the adoption of the method and system, the testing accuracy is improved.
Owner:FIFTH ELECTRONICS RES INST OF MINIST OF IND & INFORMATION TECH
System and method for simultaneously controlling spectrum and kurtosis of a random vibration
ActiveUS7426426B2Sampled-variable control systemsAmplifier modifications to reduce noise influenceFast Fourier transformAdaptive filter
Owner:VIBRATION RES CORP
Finite element analysis based pipeline random-vibration fatigue life analyzing method
ActiveCN102567567ASolve the problem of vibration fatigue life analysis and predictionRandom fatigue lifeSpecial data processing applicationsWork statusRandom vibration
The invention relates to a finite element analysis based pipeline random vibration fatigue life analyzing method, which mainly includes: by finite element analysis, after acquiring response of structural dynamic stress power spectrum density (PSD) on the condition of random vibration of pipelines, combining a damage model and a material S-N curve (stress-number of cycles curve) to compute fatigue life of a pipeline structure, and accordingly, judging whether the pipeline structure stays at the safety working state or not, if not, optimizing the pipeline structure until the pipeline structure is qualified. The finite element analysis based pipeline random-vibration fatigue life analyzing method solves the problem about vibration fatigue life analysis prediction of existing launcher model pipelines and provides guidance and verification for design and test of pipeline vibration fatigue life, can effectively analyze and predict the fatigue lives of the liquid launcher pipelines under the action of random-vibration load, provides guidance and verification for fatigue design of the pipeline structures, is sufficiently applied in the computing analysis of conveying pipes of manned space launchers and achieves excellent effect.
Owner:BEIJING INST OF ASTRONAUTICAL SYST ENG +1
Random vibration and shock compensator using a disturbance observer
InactiveUS7319570B2Record information storageAlignment for track following on disksComputer hardwareRandom vibration
Owner:SEAGATE TECH LLC
Vibration element coupled with non-linear force to improve non-resonant frequency response
InactiveUS20110048133A1Improve overall non-resonant responseEfficient in scavenging energyAcceleration measurement using interia forcesPiezoelectric/electrostriction/magnetostriction machinesElectricityPiezoelectric cantilever
Embodiments of the invention couple a non-linear force to a vibration element such as a piezoelectric cantilever to introduce chaotic, i.e., non-resonant vibration in the vibration element and thereby improve the non-resonant response of the vibration element. By doing so, the vibration element is responsive to a wider frequency range of vibrations and thus may be more efficient in scavenging energy in environments where the vibration frequency is not constant, e.g., in environment subject to multi-mode or random vibration sources.
Owner:UNIV OF LOUISVILLE RES FOUND INC
Method for predicting fatigue life of BGA (Ball Grid Array) welding spot under heat-vibration combined loads
ActiveCN103778292AThe calculation result is accurateSpecial data processing applicationsElement modelFinite element analysis software
The invention provides a method for predicting the fatigue life of a BGA (Ball Grid Array) welding spot under heat-vibration combined loads, comprising the following steps of (1), establishing the finite element model of a single BGA welding spot by adopting finite element analysis software; (2), carrying out heat cycle simulation on the BGA welding spot according to the conditions of a working environment; (3), calculating the damage rate of the BGA welding spot under heat cycle loads according to the result of heat cycle simulation; (4), carrying out random vibration simulation on the BGA welding spot under various temperature conditions; (5), calculating the damage rate caused by random vibration loads, of the BGA welding spot under the influence of heat cycle loads; (6) calculating the total damage rate of the BGA welding spot under the common action of the heat cycle loads and the random vibration loads; (7), calculating and obtaining the predicted service life of the BGA welding spot under the heat-vibration combined loads. By the adoption of the method, the precision of predicting the fatigue life of the BGA welding spot under the heat-vibration combined loads in practical production can be improved, and certain project application values are provided.
Owner:BEIHANG UNIV
Analysis method for testing fatigue life of components based on vibration signals
InactiveCN105651478ASolve the problem that it is difficult to directly obtain structural stress amplitude informationExtended service lifeVibration testingLoad timeEngineering
Owner:QINGDAO R & D INST XIAN JIAOTONG UNIV
Movable cold atom absolute gravitational acceleration sensor
ActiveCN106959473AHigh degree of freedom of light transmissionLight in massGravitational wave measurementAccelerometerAbsolute gravity
The invention discloses a movable cold atom absolute gravitational acceleration sensor, which belongs to the field of precise measurement of absolute gravitational acceleration. The sensor is composed of a vacuum unit, an optical path unit, a magnetic shielding unit, a passive vibration isolation platform, an accelerometer, an inclinometer and the like. Among them, the vacuum unit is mainly made of glass materials, and it is directly connected with the optical path unit in free space; the magnetic shielding unit is used to reduce the influence of the external magnetic field on the absolute gravity measurement; the passive vibration isolation platform is used to suppress Interference from ground vibration and noise; in addition, the accelerometer and inclinometer are mainly used for active compensation of random vibration and acquisition of vertical lines, and are assisted in absolute gravity measurement. The present invention is characterized in that the vacuum unit has a high degree of freedom for light transmission, is small in size and light in weight, and is directly connected with the optical path unit so that the measurement system is compact, stable and highly adaptable to the environment. The invention mainly solves key technical problems such as miniaturization, light weight and mobility of the cold atom absolute gravimeter.
Owner:杭州微伽量子科技有限公司
Accelerated endurance test method for catalytic converter assembly of commercial vehicle
InactiveCN102798508AImprove relevanceImprove accuracyVehicle testingVibration testingTime domainBench test
The invention discloses an accelerated endurance test method for a catalytic converter assembly of a commercial vehicle. The method comprises the steps of: collecting time domain acceleration signals by using a test track road based on a principle of same failure mode and equivalent damages; carrying out synthesis and accelerated computing to obtain an acceleration power spectral density (PSD) so as to guide an electromagnetic vibration bench to carry out a frequency domain accelerated test method of random vibration on the catalytic converter assembly. By using the method, vibration bench tests and test track road tests are correlated; because of the same failure mode and equivalent damages, the test time is greatly shortened, the endurance development cycle of a product is reduced, and the test cost is lowered; and the accelerated endurance test method has the three remarkable advantages of economy, practicability and accuracy.
Owner:SHANGHAI TENNECO EXHAUST SYST
Method for predicting influence of vibration deformation on electric performance of array antenna
InactiveCN102890741AElectrical Performance PredictionThe process is simple and fastSpecial data processing applicationsElement modelRandom vibration
The invention discloses a method for predicting influence of vibration deformation on electric performance of an array antenna. The method comprises the following steps of: 1) determining a geometric model file of the array antenna; 2) establishing a finite element model of the array antenna in ANSYS; 3) presetting an acceleration power spectrum, calculating random vibration deformation, and extracting position offset of each radiation unit; 4) calculating a pattern function of the array antenna; and 5) judging whether the pattern function satisfies design requirements. According to the conventional method, whether the structure strength of the antenna satisfies the requirement is analyzed according to the acceleration power spectrum, and the electrical performance cannot be determined according to array plane deformation errors. The method provided by the invention can realize the prediction on the electrical performance of the antenna according to the offset caused by random vibration; the method provided by the invention is more succinct, can introduce the offset into an electromechanical coupling model to calculate the electrical performance, and does not need to repeat electromagnetic modeling according to the change of the offset; and the method provided by the invention is used for analyzing the influence of vibration on the antenna and finding main structural factors, thereby ensuring that the antenna is protected from being damaged, and the electrical performance of the antenna in a working state is improved.
Owner:XIDIAN UNIV
Real-time diagnosis method for random vibration fault of steam generator set
InactiveCN101430247AMethod scienceConclusion scienceEngine testingVibration testingFrequency spectrumFourier transform on finite groups
The invention discloses a real-time random vibration fault diagnosis method for a turbo generator set, relates to the automatic on-line vibration state monitoring of the turbo generator set, and belongs to the fields of vibration state monitoring and fault diagnosis of large rotating machinery. The method comprises the following steps: acquiring bearing pedestal bush vibration signals and shaft vibration signals of a shaft system of the turbo generator set; performing necessary data preprocessing on the vibration data such as calibration conversion, abnormal point elimination and the like; adopting the Fast Fourier Transform (FFT) spectrum analysis method to perform relevance analysis between the bush vibration low frequency vibration and the shaft vibration on the vibration data, and further performing real-time quantitative computation and analysis on the bearing pedestal bush vibration data such as condition verification of low frequency vibration amplitude, the condition verification of the main frequency for the low frequency vibration, the dispersibility verification of low frequency vibration frequency components and the like, and automatically diagnosing in real time whether the random vibration fault occurs in the set by combining various verification results based on the real-time quantitative computation and analysis.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Deformed array antenna scattering performance analyzing method based on electromechanical coupling
ActiveCN104038295ASolve computing problemsShorten the development cycleTransmission monitoringElement modelPhase difference
The invention discloses a deformed array antenna scattering performance analyzing method based on electromechanical coupling. The deformed array antenna scattering performance analyzing method based on the electromechanical coupling includes that determining geometrical model parameters, material attributes and electromagnetic working parameters of an array antenna; building a finite element model of the antenna; determining constraint conditions and random vibration load, gravity load and thermal load environments of the finite element model, calculating the array surface deformation of the array antenna under the constraint conditions and load environments, and extracting the position offsets of antenna center nodes of the finite element model of the antenna under the conditions; accumulating to obtain the total position offset of the antenna; calculating the spatial phase difference of two adjacent antenna unit scatting fields in the array surface to obtain an aperture phase difference; calculating an antenna unit scattering pattern; calculating an array antenna scattering field pattern; analyzing the influence of the array structure deformation on the antenna scattering performance under the load environments. The deformed array antenna scattering performance analyzing method based on the electromechanical coupling is used for quantitatively evaluating the influence of the array surface structure deformation on the antenna scattering performance under the load environments and guiding the array antenna structure design, cooling design and scattering performance simulation analysis and evaluation.
Owner:XIDIAN UNIV
Method and system for predicting random vibration life of PCB solder point
ActiveCN105022860AAccurate acquisitionEasy to operateSpecial data processing applicationsTime responseData acquisition
The invention provides a method and a system for predicting random vibration life of a PCB solder point. Based on a sinusoidal vibration test and harmonic response simulation analysis, a stress-life curve of the PCB solder point is determined; According to a stress-time curve of a random vibration fatigue dangerous part of the PCB solder point or a strain-life curve of a PCB, the cycle number, stress amplitude and mean distribution of the random vibration fatigue dangerous part of the PCB solder point are determined with a rain-flow counting method; the random vibration fatigue loss of the PCB solder point is determined; and finally based on a Miner rule, according to the random vibration fatigue loss of the PCB solder point, the random vibration life of the PCB solder point is predicted. The whole process is based on precise data processing, the operability is strong, and a stress and time response signal is subjected to cycle number statistics and sorting with the rain-flow counting method, so that the data acquisition accuracy in the process for predicting the random vibration life of the PCB solder point is ensured.
Owner:FIFTH ELECTRONICS RES INST OF MINIST OF IND & INFORMATION TECH
Electronic product vibration DLP method based on cross-power spectrum function mode parameter identification
ActiveCN106482827AAvoid disadvantagesAccurate Vibration Remaining Life Prediction ResultsSubsonic/sonic/ultrasonic wave measurementFinite element analysis softwareDamping ratio
The invention provides an electronic product vibration DLP method based on cross-power spectrum function mode parameter identification. The method comprises the following steps of arranging acceleration sensors on a circuit board; uniformly arranging the acceleration sensors on a single-surface testing circuit board; selecting an online monitoring device, and performing connecting mounting on the online monitoring device; determining a cross-power spectrum function algorithm on a random vibration condition, and generating a cross-power spectrum density function; performing derivation of a mode parameter identification algorithm, and obtaining a first-order frequency and a damping ratio; and performing residual service life estimation by means of a Steinberg model. According to the electronic product vibration DLP method, finite-element analysis software such as vibration analysis software and simulation software are not required for simulating a vibration response mode. A vibration response data collecting operation can be finished just through the acceleration sensors and data collecting equipment. The electronic product vibration DLP method overcomes a defect that partial parameters of existing service life prediction software are empirical parameters which cannot be accurately calculated. Furthermore the first-order frequency and the damping ratio can be calculated through applying a mode identification method.
Owner:BEIHANG UNIV
Detection method for damage of random vibration structure based on correlation function amplitude vector
InactiveCN1804612AShort test timeThe identification method is simpleAnalysing solids using sonic/ultrasonic/infrasonic wavesProcessing detected response signalFrequency spectrumMeasurement point
The invention relates to a method for testing random vibration structure damage based on cross-correlation function peak value vector. It uses the relation between the frequency respond function of the cross-correlation function of the two points respond signal of the vibration structure and the structure out-exiting frequency spectrum to collect the respond signal of a period times of a plurality of measuring points, it dose cross-correlation function computing to one point respond signal with other points respond signals, it uses the largest peak of each cross-correlation function to construct the cross-correlation function peak value vector, it compares the relative factor of the intact structure and the current structure cross-correlation function peak value vector to quote weather the structure is damaged, it analyzes the content change of the corresponding elements to ascertain the damaged location.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
System for testing rotation and vibration performance of inertia device
InactiveCN101545790AImprove vibration performanceNo twistVibration testingRandom vibrationSystem testing
The invention discloses system for testing the rotation and vibration performance of an inertia device, which consists of a rotation driving system, a vibration test system, a rotation and vibration tool and a data testing system. In the rotation driving system, a motor drives the inertia device to be tested to rotate through a flexible shaft; in the vibration test system, a vibration table drives the inertia device to be tested to vibrate through a gapless bearing; and in the data test system, the output data of the inertia device to be tested are tested by a conducting slip ring. In the system for testing the rotation and vibration performance of the inertia device, the motor operates in a non-vibration environment, the bearing has excellent vibration performance, and the data test system is free from data wire torsion. The system testing the rotation and vibration performance of the inertia device can be used to test the performance of various inertia devices when the inertia devices rotate on any shaft and vibrate along a direction parallel or perpendicular to the shaft, and has a rotation speed of 0 to 10,000 degrees per second, a rotation angle free from limitation, a random vibration of 1 g<2> / Hz within a range from 10 to 2,000 HZ, and the sine sweep vibration of 30 g within a range from 10 to 2,000. At present, no other system can achieve the same goal.
Owner:ZHEJIANG UNIV
Electric automobile battery pack random vibration fatigue acceleration method based on real road spectrum
InactiveCN108036908AGuaranteed accuracyStrong engineering practicabilityVibration testingShock testingFatigue damageCar driving
The invention discloses an electric automobile battery pack random vibration fatigue acceleration method based on a real road spectrum. The method comprises the steps of (1) acquisition and analysis of the road load spectrum; (2) calculation of full life circle fatigue damage spectrum of the battery pack; and (3) formation of battery pack vibration fatigue acceleration (laboratory standard). Electric automobile battery pack laboratory stand vibration fatigue acceleration is performed for different installing positions of different automobile battery packs according to the actually measured road spectrum of the electric automobile driving so that the problem of single evaluation standard can be solved, and the China's electric automobile operation condition can be further met on the basis of the domestic road condition and the battery manufacturing level of the domestic enterprise.
Owner:开沃新能源汽车集团股份有限公司
High-precision calculating method of random vibration dynamic stress of mechanical structure
InactiveCN104850713AImprove calculation accuracyImprove computing efficiencySpecial data processing applicationsRandom vibrationStress mode
The invention discloses a high-precision calculating method of a random vibration dynamic stress of a mechanical structure. The random excitation is converted into certainty excitation, and calculation efficiency is improved when mode-coupling effect is completely taken into consideration. By the mode stress coefficient calculation, precision reduction during stress calculation by displacement derivation is avoided; static force is corrected, neglected influence of high-order modes in mode interception is considered, and calculation accuracy of random dynamic stress is improved. Cross-correlation terms among all vibration-involved modes are included during calculation, and exact solution is obtained. For large-scale and complex projects, the high-precision calculating method is easy to operate and implement and is higher in calculation efficiency than a conventional algorithm. In addition, calculation accuracy is improved by introducing a stress mode matrix and static force correction terms of the high-order modes.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Multi-beam-hole splicing and synthesizing system based on stable control of light beam directing
ActiveCN102608764ASynthetic strongIncrease duty cycleUsing optical meansOptical elementsOptical axisLight beam
A multi-beam-hole splicing and synthesizing system based on the stable control of light beam directing comprises a multi-channel laser, a light-beam-expanding collimator, a plurality of titling mirrors, a plurality of reflecting mirrors, a base, a light beam synthesizing sensor, a light beam splitter, a control computer and a multi-channel tilting mirror amplifying power supply. According to the multi-beam-hole splicing and synthesizing system, the multi-channel light beam with high duty ratio is realized by utilizing the step-shaped base and the special-shaped design of the plurality of reflecting mirrors; and the light beam synthesizing sensor is used for detecting the vibration and the drifting of each light beam, and the plurality of titling mirrors are utilized for realizing the stable control of an optical axis of each light beam, so that the high-precision light beam synthesizing of the multi-channel light beam can be realized. The system can be used for the synthesizing emission of multiple paths of light beams and also can be sued for occasions such as the communication of multiple paths of laser. The system also can be used for moving platforms such as vehicles, ships, airplanes and the like as the dynamic random vibration and the drifting of each light beam can be controlled.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Method for controlling random vibration of electrohydraulic servo system based on RLS filters
InactiveCN101697084AShorten the running cycleMeet real-time requirementsMechanical oscillations controlAdaptive filtering algorithmTime domain
The invention discloses a method for controlling the random vibration of an electrohydraulic servo system based on RLS filters, which comprises the following steps: converting an acceleration power spectral density reference signal into an acceleration time domain driving signal; taking an acceleration input signal of the electrohydraulic servo system as that of an RLS filter I; online regulating weights of the RLS filter I and an RLS filter II in real time by using an RLS adaptive filter algorithm and performing identification on a frequency response function of the electrohydraulic servo system and an impedance function of the RLS filter I respectively; and constructing a filter III based on the identification result of the impedance function of the RLS filter II, filtering the acceleration time domain driving signal and taking an output signal of the filtration as the acceleration input signal of the electrohydraulic system. The convergence property of the RLS adaptive filter algorithm adopted by the method guarantees the convergence property of the real-time online iteration of acceleration power spectral density when the characteristics of the electrohydraulic servo system and a test piece are changed.
Owner:DALIAN MARITIME UNIVERSITY
Collimating and beam expanding device for semiconductor laser sources of laser radar
ActiveCN103633557AGood collimationGuaranteed divergence angle requirementsLaser output parameters controlOptical elementsDivergence angleRandom vibration
The invention discloses a collimating and beam expanding device for semiconductor laser sources of a laser radar. The collimating and beam expanding device is mainly composed of an aspherical lens, a quartz positive lens, a tunable flange and the like. The collimating and beam expanding device is simple in structure, low in cost and good in beam collimation performance, a divergence angle of a semiconductor laser is compressed from 0.2X0.4rad to below 0.2mrad, and the requirement of the laser radar for probing light sources is met; the device is stable in optical and mechanical properties, can be used under level-18 random vibration at the environment temperature from minus 30 DEG C to minus 50 DEG C, and meets the requirement of the laser radar on stability in bad conditions; the device is provided with the flange, semiconductor laser sources different in divergence angle can be obtained by fine tuning of the flange of the beam expanding device; by tuning of the flange, the device can also be applied to beam collimation of other different-wavelength light sources.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Vehicle suspension leaf spring frequency domain fatigue analysis method
ActiveCN105808872AHeavy calculationHigh accuracy of resultsDesign optimisation/simulationSpecial data processing applicationsDiagnostic Radiology ModalityInterval method
The present invention discloses a vehicle suspension leaf spring frequency domain fatigue analysis method. The method is characterized by comprising: targeted at a pre-stress and a large transformation effect of a leaf spring, establishing a leaf spring geometric model in a free state and importing the leaf spring geometric model into finite element software for analysis; by applying a displacement constraint on a plate spring seat and applying a theoretical axle load on front and rear lugs, obtaining stress distribution in an operating state of the leaf spring, so as to obtain a leaf spring modality result file; by acquiring experimental data of a vehicle on a durability test road, obtaining a power spectrum density of a relative acceleration; and targeted at the obtained leaf spring modality result file, by using the obtained power spectrum density as a load input, executing a random vibration analysis in the finite element software, extracting a dynamic response result of a virtual prototype under a random excitation and estimating fatigue performance of the leaf spring on the durability test road according to a Gaussian three interval method. The method disclosed by the present invention is accurate in result and high in operation efficiency.
Owner:HEFEI UNIV OF TECH
Six-freedom vibration excitation system
InactiveCN104865034ASix degrees of freedom of movementOmnidirectional vibration excitationVibration testingEngineeringElectric control
The invention discloses a six-freedom vibration excitation system. The six-freedom vibration excitation system is composed of a mechanical structure subsystem, an air floating support subsystem and an electric control hardware subsystem. The mechanical structure subsystem comprises an upper platform, a lower platform and six motion branched chains, wherein each motion branched chain is composed of a two-freedom hook joint, a three-freedom hook joint and a voice coil motor actuator. The air floating support subsystem comprises air spring elements, thread screw elevators and a corresponding pneumatic control loop, for offsetting the gravity of a load in case of motion and non-motion conditions of the six-freedom vibration excitation system. The electric control hardware subsystem comprises sensors, signal conditioners, a control computer, a D / A board, an A / D board and a power amplifier, for controlling the six-freedom vibration excitation system. The six-freedom vibration excitation system has the following advantages: multi-freedom high-precision small-magnitude vibration excitation (including sine, frequency sweep and random vibration) under various conditions is provided for correlation precision instruments in the field of a spaceflight technology, and an on-orbit vibration environment is simulated and the instrument reliability is examined in a laboratory environment.
Owner:BEIHANG UNIV
Random vibration and shock compensator using a disturbance observer
InactiveUS20070064334A1Shock and vibrationRecord information storageAlignment for track following on disksComputer hardwareRandom vibration
A data storage device adapted to compensate for physical disturbances has a storage medium, a read-write mechanism positionable relative to the storage medium, and a disturbance observer. The read-write mechanism is adapted to read and write data. The disturbance observer compensates a position of the read-write mechanism according to low-frequency components of physical disturbances.
Owner:SEAGATE TECH LLC
Avionic device operating modal measuring method for vibration finite element model correction
ActiveCN103983412ASpeed up the development processSave testing timeVibration testingModal testingElement model
The invention provides an avionic device operating modal measuring method for vibration finite element model correction. The method includes the following steps that firstly, response test points are arranged, and piezoelectric acceleration transducers are pasted, wherein the n response test points are arranged on a circuit board, and the piezoelectric acceleration transducers are pasted on the response test points respectively; secondly, an avionic device and a test device are installed, and an operating modal test platform is built; thirdly, time domain response data of the avionic device under the random vibration condition are acquired; fourthly, data processing is conducted through modal recognition software, and operating modal parameters of the avionic device are acquired. Through the steps, an avionic device operating modal measuring system for vibration finite element model correction is established, and the overall process from generation of random vibration signals to acquisition of the time domain response data and from generation of a time domain response data sample and a cross-spectrum function to recognition of the operating modal parameters of the avionic device is finished. According to the method, online modal recognition is achieved, and test time is saved and test cost is reduced.
Owner:BEIHANG UNIV
Combined environment test method for integrated circuit
InactiveCN101957426AAccurately evaluate qualityAccurately evaluate reliabilityElectronic circuit testingTest powerFunctional testing
The invention discloses a combined environment test method for an integrated circuit, which comprises the following steps of: S1) acquiring the highest test temperature, the lowest test temperature, the highest test temperature change rate delta TE, a test power density spectrum, a test humidity and a test electric stress according to the basic product information of the integrated circuit and the used environment information, S2) according to the test data, performing a temperature cycling test, a random vibration test and a humid test while respectively exerting a rated operational voltage, the maximum operating voltage and the minimum operating voltage on the integrated circuit, and S3) after finishing the tests, performing a functional test on the integrated circuit, confirming the integrated circuit invalid if the integrated circuit loses the function or any property parameter value exceeds a designed scope, otherwise, confirming the integrated circuit being in good condition. The invention can really simulate the actual using environment of the integrated circuit, quickly and completely arouse the faults of the products and provide a reference to improve the design and the manufacturing shortcomings of the integrated circuit.
Owner:BEIJING SHENGTAOPING TEST ENG TECH RES INST
Control device and control method used for multi-dimensional random vibration test
InactiveCN102122151AImprove stabilityImprove reliabilityTotal factory controlVibration testingTime domainControl system
The invention discloses a control device and a control method used for a multi-dimensional random vibration test. The device comprises a Personal Computer (PC) or an industry control computer and a VXI measurement and control system. The PC or the industry control computer comprises a display interactive module and a calculation control module. The method comprises the following steps of: setting the condition of the multi-dimensional random vibration test, and the reference spectrum matrix of a controlling point; calculating a frequency domain driving signal by the calculation control module; generating continuous time domain random driving signals, and driving the vibration of the controlled objective; forming a control spectrum matrix; calculating an error matrix between the control spectrum and the reference spectrum on each control frequency point; judging the threshold value of the error matrix; modifying the spectrum modified matrix in an iterative manner; and calculating a new random driving signal of the modified matrix. The control device and the control method have high performance in the functions of collecting and processing the dynamic signal and generating the arbitrary waveform with high stability, reliability and openness, and can ensure the precision and the real-time performance of collecting the vibration response signal and transmitting the driving signal.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Power transmission line wind vibration control method based on simulated random gust field calculation
ActiveCN102623939AThe implementation effect is goodDevices for damping mechanical oscillationsLoad timeFluid solid coupling
Owner:ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
Automatic feeding device
The invention belongs to the field of automatic machinery and provides an automatic feeding device. The automatic feeding device comprises a vibrating feeding device, a material conveying device, an automatic material taking device and a circulating feeding device. The vibrating feeding device is used for conducting vibration feeding on materials so that the materials can be fed in a random vibration mode. The material conveying device is used for receiving the materials from the vibrating feeding device. The automatic material taking device is used for taking the materials with the postures capable of meeting the requirement from the material conveying device. The material conveying device is further used for conveying the materials with the posture incapable of meeting the requirement to the circulating feeding device. The circulating feeding device conveys the materials with the postures incapable of meeting the requirement to the vibrating feeding device again. By the adoption of the automatic feeding device, random feeding is conducted on the materials in a mechanical vibration mode, vibration feeding is conducted on the materials with the postures incapable of meeting the requirement again, and therefore the automatic feeding device is high in universality and suitable for various materials with different shapes.
Owner:SHENZHEN AMI TECH CO LTD
Random vibration analysis and calculation method of free body multi-point correlated pulsating pressures
ActiveCN107480322ACalculation speedEasy to scale in parallelGeometric CADSustainable transportationElement modelStructural dynamics
The invention discloses a random vibration analysis and calculation method of free body multi-point correlated pulsating pressures. The method comprises the steps that firstly, a finite element discrete model of free body structure dynamics is established; secondly, modal analysis of a free body is conducted; thirdly, a dynamic equation of rigid body motion and elastic motion of a free body structure is established; fourthly, corresponding modal of the pulsating pressures participates in the calculation of coefficients; fifthly, the random vibration power spectral density response calculation is conducted on the rigid body response, the elastic response and the coupling response under the pulsing pressure effect; sixthly, root mean square equivalent response of the whole structure is calculated. The random vibration analysis and calculation method has the advantages that the proposed method is fast in calculation speed, easy to expand and large in computation scale and the like, meanwhile considering the influence of the rigid body modal and the elastic modal, the response characteristic of an aircraft reentering a flying process is more accurately simulated, and the fast vibration response can be solved for the fine finite element model of an aircraft structure.
Owner:GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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