44 results about "Transient kinetics" patented technology

The invention discloses a complete and high-resolution test method for the motion characteristics of particles in turbid media. The method comprises the following steps of: performing continuous, complete and real-time detection on the motion characteristics of the particles in the process of 'solution-colloid-sediment' of the turbid media by combining the resolution relation between the characteristic value of a speckle pattern and particle motion and utilizing a dynamic speckle test light path according to the particle light scattering theory; simultaneously, performing transient study on different critical points of the particle motion in the process by using a femtosecond laser test light path to perform the analysis of high spatial and temporal resolution on transient dynamics of the particles in the turbid media; and combining the two steps to realize the complete test with high spatial and temporal resolution characteristic on motion images of the particles in the process of 'solution-colloid-sediment' of the turbid media finally. The method is a non-contact, high-accuracy and real-time online detection method, has the characteristics that the operation is simple and the application range is wide, and can be widely used in the fields of medical science, pharmacy, chemical production and the like.

The invention discloses a vehicle collision transient kinetic energy reduction magnetic force buffering system and method. The system comprises a data collection module, a collision prediction module, a magnetic force buffering device and an Internet of Vehicles, wherein the data collection module obtains travelling data of a present vehicle and a vehicle travelling in the front and separately transmits the travelling data to the Internet of Vehicles and the collision prediction module; the collision prediction module analyzes the travelling data of the present vehicle and the vehicle travelling in the front and performs collision prediction of the present vehicle and the vehicle travelling in the front by using a physical pursuit problem algorithm when the relative distance between the vehicles is smaller than 1m; and the magnetic force buffering device is used for performing data conversion calculation of magnetic-electricity of the system, signal transmission and reception, and magnetic force generation. By the adoption of the vehicle collision transient kinetic energy reduction magnetic force buffering system and method disclosed by the invention, the vehicles having a collision risk form a magnetic field with the same polarity through magnetic disks, so that the accident loss is reduced and the safety of life and the property of drivers and passengers can be ensured.

The invention discloses a power grid system transient destabilization differentiation method, is applicable to a power grid dispatching and control center provided with a wide area measuring system. Based on the transient destabilization differentiation method for the conventional tract geometry characteristic, the invention introduces the micro-variable quantity of the transient kinetic energy and the transient total energy to serve as differentiation reference so as to improve the accuracy of the differentiation result, and further improves the differentiation effect via tract fitting and grouping re-evaluation. Compared with the prior art, the invention can obtain more accurate and reliable transient destabilization differentiation effect.

The invention provides a method and system for evaluating the effect of a power system emergency control strategy. The method comprises: invoking a fault emergency control strategy table according tothe fault scenario information when the power system fails, and determining an online matching emergency control strategy, a simulation equivalent power angle trajectory Pfz (Deltafz), an expected transient kinetic energy Vfz trajectory and an expected transient stability margin Sxn; obtaining an actual equivalent power angle Deltasj, an actual equivalent rotational speed deviation Omegasj and transient deviation energy Vpc(Deltasj) according to the actual power angle and the rotational speed deviation of a generator at the current time of the power system; determining the effect of the emergency control strategy according to the value of Vpc(Deltasj) and comparing the absolute value of the Vpc(Deltasj) and Sxn; and determining the operating status of the power system, and determining whether to end the evaluation according to the effect of the emergency control strategy and the operating status of the system. The method and system can evaluate the prevention and control effect of theemergency control strategy of the power system in real time, and find the fault scene with invalid strategy as early as possible, which provides valuable decision time for adopting additional controlor active de-allocation.

The invention belongs to the technical field of helicopter designs and analysis, and relates to a full-helicopter anti-crash hierarchical simulation method. The full-helicopter anti-crash hierarchical simulation method comprises the following steps: using a finite element analysis pre-processing software Patran, and respectively establishing a flexible landing gear simulation model, a helicopter fuselage rigid material model and an anti-crash seat rigid material model, then using a transient dynamics analysis software Dytran to carry out helicopter crash simulation, and then removing a landing gear model, using the finite element analysis pre-processing software Patran, changing the helicopter fuselage rigid material model to a fuselage flexible model, then removing a fuselage model, using the finite element analysis pre-processing software Patran, changing the seat rigid material model to a flexible model, and finally completing the full-helicopter anti-crash simulation. The full-helicopter anti-crash hierarchical simulation method disclosed by the invention uses a method of combination of the rigid-flexible models and hierarchical processing, thereby being capable of greatly reducing the required simulation time, lowering the analysis cost, meeting the precision requirement and accurately simulating helicopter crash gestures.

The invention relates to a parameter optimization method based on Pareto optimality under a dual-mode configuration multi-target condition, and belongs to the field of new energy vehicles. The method comprises the following steps: S1, constructing a steady-state kinetic equation under different configuration modes of a dual-mode configuration and a mode switching strategy based on transmission efficiency maximization; S2, establishing a hybrid power transmission system transient kinetic equation considering the rotational inertia of components; S3, based on a dynamic programming algorithm, constructing economic evaluation indexes including working condition related economic cost and transmission system part cost and a dynamic property evaluation index quantified by hundred kilometers of acceleration time; and S4, constructing a multi-objective optimization function through a Chebyshev aggregation method, and obtaining the economic cost related to the dual-mode configuration related working condition, the power transmission system part cost and the optimal Pareto leading edge of the dynamic property taking the acceleration performance as an evaluation index based on a multi-objective evolutionary algorithm MOEA / D. According to the method, a wider design space is provided for configuration optimization.

The invention discloses a bridge condition rapid rating method based on influence line recognition. The invention discloses a bridge condition rapid rating method, belongs to the field of bridge detection, and aims to provide a bridge condition rapid rating method capable of accurately and efficiently identifying bridge displacement influence, and the method is characterized by comprising the following steps: S1, calculating a theoretical influence line, and obtaining the theoretical influence line through finite element transient dynamics solution; S2, actual measurement influence lines are obtained, deflection time history data of the whole running process are obtained in real time, the test cross section is a midspan position, and the cross section is transversely arranged for 2-2 h; Three measuring points; S3, extracting a static load influence line, removing wavelet coefficients corresponding to the noise on each frequency band, keeping wavelet decomposition coefficients of the original signals, and performing wavelet coefficient reconstruction on the processed coefficients to obtain denoised signals; And S4, constructing a verification coefficient index, and carrying out bridge condition rating according to the verification coefficient index. The method is suitable for rapid rating of bridge conditions.

The invention discloses a dynamics optimization method for vibration reduction of large-scale trusses. The method comprises the following steps of: establishing a finite element model; carrying out modal analysis and transient dynamics analysis on the established model; analyzing each order of modal energy according to a modal energy method, intercepting several orders of modals which occupy relatively large energy, and analyzing a vibration mode to determine a weak link; aiming at the weak link, improving structural dynamic stiffness through adding a beam, carrying out optimal design on the added beam by taking quality minimization as a design target, taking allowable stress and structural oscillation amplitude of steel as constraint conditions and taking a sectional dimension as a designvariable; and establishing an optimized finite element model, and carrying out dynamics analysis to verify effectiveness of the dynamics optimization. Compared with the prior art, the method has theadvantages that added mass caused to structure by structure optimization is small, the structure complexity is not increased, and strength and dynamic stiffness analysis are finally carried out to ensure favorable dynamics performance and statics performance of trusses.

The invention provides a vibration simulation analysis method and device of a vane pump rotor system. The method comprises the following steps of: utilizing a three-dimensional water body grid to establish a computational fluid mechanics model; taking a steady state calculation result as an initial value, obtaining the transient state calculation result of each vane grid unit and each hub grid unit according to preset parameters, and obtaining the transient state stress of a vane wheel through an integral method; taking the transient state stress of the vane wheel as a loading condition of a vane wheel mass point, adopting finite element analysis to carry out transient state kinetic analysis on the rotor system consisting of a main shaft, a bearing and the vane wheel mass point according to preset rotor system information, and obtaining a transient state kinetic analysis result; and according to the transient state kinetic analysis result, obtaining the vibration situation of the rotor system. By use of the method, the computational fluid mechanics model and a rotor kinetic finite element analysis model can be combined to quickly and accurately obtain the vibration situation of the vane pump rotor system under hydraulic induction, and the design requirement of the vane pump rotor system is met.

The invention discloses a detection device for hole capturing dynamics of surfaces of quantum dots. The detection device comprises a first pumping light pulse, a second pumping light pulse, a detection light pulse, an electromagnet, a half-wavelength plate, a polarized beam splitter, a differential balance detector and a phase-locked amplifier, wherein the first pumping light pulse is generated by an ultrashort pulse laser device through frequency conversion of an optical parameter amplifier, and the change of amplitude of an electronic spinning coherent signal along the delay time can be detected by changing the delay time between the first pumping light pulse and the second pumping light pulse through the differential balance detector. According to the detection device and the detection method, the weak light excitation is not utilized, the influence from recombination of carrier radiation and auger non-radiation can be completely eliminated, and the transient dynamic characteristics captured by the surface holes of the quantum dots can be directly reflected through monitoring the transient change of the electronic spinning signal amplitude. The invention further discloses a detection method for hole capturing dynamics on surfaces of quantum dots.

The invention relates to a braking flutter inhibition method based on chassis angle assembly transient dynamics. The method comprises the following steps that: performing a braking flutter finished automobile road experiment; obtaining experiment data, according to the obtained data, obtaining a working condition parameter and a flutter evaluation index when flutter happens; establishing a finiteelement model of the chassis angle assembly transient dynamics, setting an input parameter according to the working condition parameter when the flutter happens, and verifying the model; according tothe finite element model, obtaining stick slip motion characteristics when the flutter happens, and determining a relationship among a system structure parameter input by the model, frictional characteristics and stick slip motion; and inputting the parameters into the model, and according to a model output result, selecting the input parameter which exhibits a highest influence amplitude value onthe flutter evaluation index output by the model, and obtaining a method for inhibiting the flutter of a vibrator. Compared with the prior art, the method has the advantages that a flutter problem ina braking process is effectively solved from a principle, automobile improvement cost is low, feasibility is high and the like.

The invention discloses a life analysis method of a pumped storage unit based on a hydro-mechanical coupling model, which includes establishing finite element model of a hydro-generator and a water body model of whole flow channel of a pumped storage unit, simulating transient electromagnetic field and transient flow field respectively, obtaining electromagnetic field distribution and electromagnetic force density between stator and rotor air gap of hydro-generator, pressure distribution and velocity distribution in flow field of whole flow channel; transforming the electromagnetic field distribution and electromagnetic force density between stator and rotor air gap, the pressure distribution and velocity distribution in the whole flow field into transient excitation. The transient excitation is applied to the finite element model of pumped storage power station shafting, and the transient dynamics simulation is carried out to obtain the stress-strain nephogram and stress-strain curveof shafting. The fatigue life of the pumped storage unit is calculated by using the load spectrum which is obtained from the statistical analysis of the stress curve. The invention obtains the life analysis result with higher precision and closer to the engineering practice.

The invention discloses a method for repairing copper film sample fatigue damage by multiple vibration treatment, and belongs to the technical field of machinery manufacture and vibration treatment application. A device comprises a sample isolating device, a modal exciter, a power amplifier and a signal generator. According to the method, fatigue damage processes of original samples are statically analyzed and simulated by the aid of finite element analysis software, vibration treating processes are analyzed and simulated by the aid of transient dynamics, stress conditions of the samples are analyzed, so that optimal repairing effects and corresponding parameters are acquired, changes of microstructures of the inside of the copper film samples are different after fatigue damage is formed once, transient analysis is performed by the finite element analysis software, so that vibration repairing and treating tests are simulated, the optimal repairing effects and the corresponding parameters are acquired, and each acquired optimal parameters serve as device output parameters. According to the method, multiple vibration repairing treatment tests are guided by the optimal parameters acquired in a finite element simulation manner, damage of the samples is constantly wiped, and each repairing effect is optimal, so that remaining life is continuously prolonged.

The invention discloses a method for reducing a transient impact load of a switch operating mechanism insulating pull rod and belongs to the field of high-voltage switch and digital simulation study. The method comprises a first step of establishing a transient dynamics finite element model according to a geometric model of a switch, implementing dynamic calculation of the high-voltage switch separating brake process, and extracting a transient impact load peak of the insulating pull rod; a second step of parameterizing a contact surface shape; a third step of performing design of experiment (DOE) calculation and sensitivity analysis; and a fourth step of utilizing an optimization algorithm to search an optimal reference point and producing an optimal spline. According to the method, impact stress generated on the insulating pull rod during switch motion can be effectively reduced, and switch reliability is improved.

The invention provides a radiation source generation system based on pulse periodical phase modulation. The radiation source generation system can be applied to research about the transient dynamic process. The radiation source generation system based on pulse periodical phase modulation comprises a nanosecond pulse laser, a 2*2 optical switch, an adjustable time delayer, a broadband phase modulator, a gain compensation amplifier, a preamplifier, a main amplifier, a pulse compressor, an ultra-short laser pulse sequence, a pulse electron beam and an X-ray source pulse sequence. A repetitive pulse shaping narrow band nanosecond pulse generated by the nanosecond pulse laser enters an annular cavity formed by the adjustable time delayer, the broadband phase modulator and the gain compensation amplifier through the 2*2 optical switch, circulates for multiple times in the cavity and then is output as a periodical linear chirp pulse sequence; the periodical linear chirp pulse sequence is amplified in the preamplifier and the main amplifier and then is compressed by the pulse compressor to generate the ultra-short laser pulse sequence, and the ultra-short laser pulse sequence interacts with the synchronous pulse electron beam to generate the X-ray source pulse sequence.

The invention discloses a converter multi-scale modeling method based on microscopic and macroscopic description. The converter multi-scale modeling method comprises the steps: 1) selecting a topological structure and an auxiliary circuit of a converter, and analyzing the to-be-observed scale of the converter; (2) determining a level needing to be developed in research, and selecting a multi-scalecomponent according to the level; 3) selecting a physical field factor according to the converter operation environment; 4) determining a research mode by utilizing the information; 5) selecting components and nodes for multi-scale observation, and respectively setting a consistency observation point, a reliability observation point and a corresponding error rate delta; and (6) judging an error between the macroscale and a set reference value through an observation point, switching the microscale for calculation when the error of the macroscale is greater than a set error rate delta, and correcting parameters of the macroscale by utilizing an obtained result to finish data conversion between the scales. According to the converter multi-scale modeling method, the coupling relation betweentransient dynamic characteristics of all components and circuits is introduced into modeling of the power electronic converter, and accurate simulation, control and reliability analysis of the systemare achieved.

The invention discloses a visual modeling method for simulating stress change of a building in a moving process, which comprises the following steps of: establishing a model for simulating the building moving by using ANSYS software, adding restriction and application conditions with different substeps according to the rail unevenness for carrying out transient kinetic analysis on the model, storing node displacements of substep analysis results; and establishing a three-dimensional solid model of the building moving by using 3DMAX (three-dimensional animation), endowing the material attributes, storing as an ASE (Active Seeker Electronics) format. Compared with the prior art, the invention can more accurately predict the position of a danger point of the building, greatly reduce the read data volume, lighten the load of a CPU, highlighting key parts, and solve the problem of incontinuous read numbers by adopting a successive reading method and a segmented displaying method through defining a structure body and a map structure. Meanwhile, the successive reading method and the segmented displaying method are used for displaying stress change of the building, i.e. read displacement variable and color depth.

The invention discloses an ANSYS based digital simulation method of building migration for carrying out digital simulation in building migration realized by using hydraulic cylinder jacking. The method comprises the following steps of: programming by using the APDL (Ansys Parametric Design Language) language of the ANSYS, establishing a migrated building model and carrying out statics analysis; extracting the resultant force of bearing reaction forces in an analysis result and the bearing reaction forces of all jacking points; programming a digital road program; setting data actually required to be tested according to the information established by the ANSYS and an obtained result; and carrying out transient kinetics solving to obtain a digital simulation result in the process of the building migration. Compared with the prior art, the invention can be used for carrying out digital simulation of buildings with different lengths and widths and has wider applicability; the road unevenness can be arbitrarily modified, and the influences of various roads on the stress of the buildings can be simulated; the influence of the reaction time of a hydraulic cylinder is added, thus the simulation is closer to the reality; and the powerful analysis function of the ANSYS is utilized, and results are more visual through outputting the graphs of relative results by utilizing the ANSYS.

The invention discloses a process method for detecting enzyme intermediates in real time by use of an electrochemical biosensor. The process method is realized by continuous measurement of a reduction current on sensor poles relevant to the intermediates. In an H2O2 redox reaction system catalyzed by an immobilized horseradish peroxidase, quantitative relationship is present between electron transfer and quantity of enzyme intermediates during the reaction process. Through examination of influence on enzymatic activity by a substrate, an inhibitor and both the substrate and the inhibitor, the method is proved to track the change of the enzymatic activity and the relative amount of the intermediates in real time. Compared with the traditional intermediate detection method, the method provided by the invention has the characteristics of high sensitivity and low cost, can be used as the standard for transient dynamics detection and can be further applied in laboratories, medical tests and industries.

The embodiment of the invention discloses an aerodynamic damping calculation method for an impeller machine, and relates to an aerodynamic stability analysis technology for the impeller machine, and the method comprises the steps: carrying out the dynamic modal analysis of an isolated blade, and obtaining the vibration mode and frequency characteristics of the blade; constructing a modal excitingforce through modal data, writing the modal exciting force into a transient structure dynamic calculation command, and performing motion coupling iterative calculation on unsteady flow field calculation and transient structure dynamic calculation through a blade to obtain a response of the blade in a flow field; solving the transient kinetic equation in the vacuum to obtain the response of the blade in the vacuum; fitting a displacement response envelope line of a monitoring point in vacuum and a flow field through the logarithmic basis function to obtain non-pneumatic damping and total damping, and further calculating and obtaining the pneumatic damping.

The invention discloses a manufacturing method of an ankle-foot orthosis based on a 3D printing technology and relates to the field of rehabilitation therapy. The improved manufacturing method of theankle-foot orthosis mainly comprises the following steps that (1) an ankle joint walking gait is researched; (2) an initial three-dimensional model of the ankle-foot orthosis is established based on analysis and research of the ankle joint walking gait; (3) the initial three-dimensional model of the ankle-foot orthosis is subjected to dynamic analysis; (4) a prop part of the ankle-foot orthosis issubjected to topological optimization; (5) the optimized ankle-foot orthosis is reconstructed geometrically; (6) a reconstructed ankle-foot orthosis model is subjected to transient dynamic analysis;and (7) a 3D printer is used for conducting 3D printing on the final model. The 3D-printed ankle-foot orthosis is small in mass and good in air permeability, can achieve the power assisting effect andhas a good rehabilitation therapy effect.

The invention discloses a multi-stability problem matrix type quantification index calculation and AC-DC coordination control method, and belongs to the power system and automation technical filed; the multi-stability problem matrix type quantification evaluation index and method based on transient kinetic energy improvement and perturbation sensitivity can fully consider single stability and integral stability control effect, control negative effect and overshoot control; the method uses a multi-stability problem influence factor matrix to evaluate the stability-problem dynamic improvement effect in a control measure application process, considers target functions with the smallest control cost and the biggest multi-stability problem weight index, thus determining the best AC-DC emergency control strategy, and improving the adaptability of the emergency control algorithm processing complex stability conditions. The method allows power system operation personnel to handle complex system internal running rules, and provides basis for coordinating and making the transient stability emergency control strategy, thus improving the system safety stability control validity and online automation calculating level.

The invention relates to a method for calculating the fatigue life of a belt type CVT steel belt ring under a high rotating speed condition. The method comprises the following steps: carrying out belt type CVT transient dynamic analysis; obtaining a load spectrum of the infinitesimal section of the steel belt ring running for one circle by using an equivalent method, and then calculating the fatigue life of the belt ring under the specified condition; respectively considering two types of conditions of rotating speed, torque change and speed ratio change under a fixed speed ratio, and obtaining a theoretical life image of the CVT belt ring by using a life calculation method which is the same as the previous two steps and combining a data interpolation method; the method comprises the following steps: firstly, obtaining probability distribution obeyed by a general working condition speed ratio, an input torque and an input rotating speed by using a statistical method; calculating the life of a belt ring at a constant speed ratio by considering the probability of a CVT theoretical life image and an input condition; and finally, obtaining the actual service life of the belt ring under general working conditions by using the service life of the belt ring with different speed ratios and the probability distribution obeyed by the speed ratios. The method for calculating the fatigue life of the steel belt ring is provided from the theoretical angle, and the fatigue life of the steel belt ring can be accurately estimated.

The invention provides a radiation source generation system based on a stacked chirp pulse sequence. The system can be applied to research about a transient dynamic mechanism. The radiation source generation system based on the stacked chirp pulse sequence comprises a mode-locked laser, a pulse frequency demultiplier, a pulse stacker, a pulse stretcher, a preamplifier, a main amplifier, a pulse compressor, an ultra-short laser pulse sequence, a pulse electron beam and an X-ray source pulse sequence. A high-repetition-frequency broadband chirp pulse source generated by the mode-locked laser is subjected to frequency demultiplication through the pulse frequency demultiplier, passes through the pulse stacker to obtain the stacked chirp pulse sequence, passes through the preamplifier and the main amplifier and then enters the pulse compressor, and the compressed ultra-short laser pulse sequence interacts with the pulse electron beam to generate the X-ray source pulse sequence.

The invention relates to a roller coaster track vibration response test method based on wheel-rail coupling. The method comprises the following steps: 1) establishing a roller coaster dynamics simulation model; 2) setting constraints for simulating the actual running condition of the roller coaster in the roller coaster dynamics simulation model, wherein the constraints comprise point-line constraints for simulating wheel-rail coupling between a roller coaster wheel and a rail; 3) adding a load to the roller coaster dynamics simulation model; 4) solving the roller coaster dynamics simulation model to obtain wheel-rail contact force under different wheel sets, different wind power and different loads; the method comprises the steps of (1) establishing a finite element simulation model of atypical track unit section, and (6) carrying out transient dynamics analysis in the finite element simulation model based on the wheel track contact force obtained in the step (4) to obtain the vibration response of each structure of the track, and compared with the prior art, the method has the advantages of strong pertinence, high accuracy and the like.

The invention discloses a method for reducing a transient impact load of a switch operating mechanism insulating pull rod and belongs to the field of high-voltage switch and digital simulation study. The method comprises a first step of establishing a transient dynamics finite element model according to a geometric model of a switch, implementing dynamic calculation of the high-voltage switch separating brake process, and extracting a transient impact load peak of the insulating pull rod; a second step of parameterizing a contact surface shape; a third step of performing design of experiment (DOE) calculation and sensitivity analysis; and a fourth step of utilizing an optimization algorithm to search an optimal reference point and producing an optimal spline. According to the method, impact stress generated on the insulating pull rod during switch motion can be effectively reduced, and switch reliability is improved.

The invention provides a CAE analysis method for motorcycle strength based on a virtual pavement and explicit transient dynamics, and the method comprises the following steps: S1, constructing a virtual pavement for testing the fatigue strength of a motorcycle, and determining a stress-strain curve corresponding to a material used by the motorcycle; s2, determining a rigidity and damping force curve of a shock absorber of the motorcycle; s3, building a tire model of the motorcycle through finite element software; s4, constructing a whole motorcycle 3D model matched with the motorcycle through finite element software; s5, constructing a driving system model of the whole vehicle and the virtual road surface in finite element software; s6, calculating the running process of the whole vehicle on the virtual road surface through finite element software, and obtaining acceleration, displacement and stress information in the calculation process; and S7, through the acceleration, displacement and stress information, optimizing and improving the whole vehicle by utilizing an optimization function of the finite element software, entering the step S4 until the optimization is completed, obtaining the optimal acceleration, displacement and stress information, and ending.

The invention discloses a derrick steel structure damage identification method based on an IMF (Intrinsic Mode Function) instantaneous energy curvature difference value. The method comprises the following steps of: carrying out modal analysis on a derrick steel structure to determine the low-order vibration modal of the derrick steel structure, and carrying out transient dynamic analysis on the derrick steel structure to extract the vibration responses of different positions of the derrick steel structure; utilizing a band-pass filtering method to extract the low-order vibration signals of different positions of the derrick steel structure, carrying out EMD (Empirical Mode Decomposition) decomposition on the low-order vibration signals to select main IMF components, and adopting a central difference method to calculate the IMF instantaneous energy curvature; and taking the IMF instantaneous energy curvature difference value obtained before and after the derrick steel structure is damaged as a damage sensitive index so as to realize the identification and the analysis of derrick steel structure damage positions and degrees. By use of the method, only the low-order vibration information of the derrick steel structure needs to be used for realizing damage position identification, identification accuracy is high, and the problem that the damage can not be accurately identified since large complex steel structure high-order vibration information is difficult in obtaining is solved.