41results about How to "Meet the test accuracy requirements" patented technology

The invention is a microtype bearing friction moment measurer, belonging to the field of measuring and control technique. And the invention comprises: mechanical part, electrical part and embedded system, where the mechanical part is connected with the input end of the electrical part through lead wires and USB interface, and the input and output ends of the electrical part are connected the input and output ends of the embedded system, respectively. And the invention adopts digital image processing technique, embedding technique and auto control technique to be able to accurately measure friction moment of a microtype bearing. And the measurer has simple structure, operating convenience and high measuring accuracy.

The invention relates to a digital array radar amplitude-phase monitoring and calibration method based on an optical fiber delay system. The method mainly includes the steps that a radar array front array element and an array front monitoring coupled array element are utilized to collect amplitude-phase data of all uplink channels and all downlink channels of the radar array front array element in a mutual coupling mode, amplitude-phase monitoring of all the uplinks and the downlinks of a radar array front is finished, when amplitude-phase correction and calibration need to be conducted on the array front, the difference value between the amplitude-phase data and factory data is acquired through amplitude-phase monitoring, and then amplitude-phase calibration of the uplinks and the downlinks of the array front is finished after the difference value is corrected. According to the method, the optical fiber delay system is introduced to separate transmitting time from receiving time, within a transmitting monitoring operation time sequence, the monitored channels work in a deep blanking state, optical fiber amplitude-phase drifting self-calibration is finished, and accuracy of monitored data is guaranteed. The method has the advantages of being good in real-time performance, convenient and quick to operate, and good in cost performance. The presentation and engineering realization of the method have high practical application value in the field of digital array radar monitoring and calibration.

The invention provides a method and device for automatically calibrating micro-ammeters, which relate to the technical field of micro-ammeter calibration equipment. The method comprises the following steps that: firstly, through using a precision voltage source and a standard resistor, a voltage-current curve is obtained through measurement by using a precision ammeter; then, through using the precision voltage source, a voltage-current curve is obtained through measurement implemented by an ammeter to be calibrated; through data fitting, the parameters of the two curves are obtained; and through coefficient correction, the curve of the ammeter to be calibrated is close to that of a standard ammeter as far as possible. A hardware part of the device provided by the invention mainly comprises a computer, a precision voltage source, a standard resistor, a conversion module, a precision ammeter and an ammeter to be calibrated. By using the method and device provided by the invention, the test accuracy of a micro ammeter can be greatly improved, even close to that of a precision electrometer-level ammeter; the method is simple and reasonable, unique in principle and high in accuracy; the device is simple in structure and stable in performance; and the test accuracy requirements of the micro ammeter used in a depolarized relaxation current test for the insulation performance of high voltage equipment can be satisfied.

The invention provides medical rigid endoscope detection equipment. An endoscope holder is arranged on one X-Y-Z three-dimensional moving and spinning test floor which is arranged on a guide rail of an optical test floor; and a locating device and a testing device frame are arranged on an uppermost platform of the other X-Y-Z three-dimensional moving and spinning test floor. The center of the locating device is coincide with the spinning axis of the test floor, a testing device frame installing hole is arranged in a 90-DEG bent-board perpendicular plate, and a fastening bolt is arranged on the 90-DEG bent-board perpendicular plate. The front end of the testing device frame can be provided with testing devices of a resolution plate lens cone, an illuminometer measuring head, an equal spectrum diffuse reflection screen, a collimator, a diffuse transmission screen, a diaphragm and the like in a replacing manner. The medical rigid endoscope detection equipment can be used for testing all measuring technical data contents of a rigid endoscope of a medical endoscope, partial optical properties and testing methods thereof in national standardYY0068-2008 in a once-clamped rigid endoscope, is convenient for use and rapid in testing, and accords with all testing accuracy requirements.

The invention relates to a rock-like material for simulating reservoir rock heterogeneity and a test piece preparation method, and belongs to the field of rock-like material preparation. The method comprises the following steps: measuring reservoir rock heterogeneity, particle size distribution condition and mechanical parameters; analyzing the influence of the particle size ratio degree on the reservoir rock heterogeneity and the mechanical parameter sensitivity of the rock-like material, and establishing a grading model and a mathematical relationship curve of the rock-like material with different heterogeneity degrees under different particle size ratio conditions by taking the particle size of the quartz sand particles as an index; referring to a fracturing test, and selecting quartz sand particles with corresponding particle sizes to perform aggregate proportioning by using a heterogeneous degree of rock and a rock-like specimen aggregate particle size grading schematic table; preparing a rock-like test piece by taking the quartz sand particles as aggregate, and carrying out maintaining and demolding operation to obtain the rock-like material. The heterogeneous rock-like material provided by the invention can well reflect the control effect of the particle size on the rock heterogeneity, and can accurately describe heterogeneity characteristics of a complex lithologic stratum.

The invention discloses a technical scheme and a high-precision measuring method of a measuring device for measuring low-heat-conduction thermal insulation materials, provides a device and a method for measuring the heat conductivity of an active heat-protection type calorimeter by virtue of a quasi-steady-state method as well as a calorimeter correction method and technical scheme based on ASTME2584. Aiming at the shapes and types of different testing materials, an active heat-protection type structural design of a measuring device including a single panel sample, a dual-panel sample and a cylindrical sample is provided. According to the technical scheme, the lateral heat loss can be effectively eliminated, one-dimensional heat flow can be effectively guaranteed, the low heat conductivity measurement and the ultralow heat conductivity measurement on the thermal insulation materials can be realized under high-temperature and ultrahigh-temperature conditions, the continuous dynamic measurement on the heat conductivity in the whole temperature range can be realized, and meanwhile, the measurement accuracy is relatively high.

The invention discloses a submerged floating tunnel pipe section attitude measuring device and a submerged floating tunnel pipe section attitude test system and method. The submerged floating tunnel pipe section attitude measuring device comprises a bracket fixedly connected with a submerged floating tunnel model pipe section, a background plate fixedly connected to the bracket, at least two characteristic points arranged on the background plate and an image acquisition device for acquiring real-time images of the characteristic points. The submerged floating tunnel pipe section attitude testsystem comprises a water pool, a model pipe section and any measuring device, wherein the model pipe section is placed in the water pool, and the bracket of the measuring device is fixedly installed on the model pipe section. The submerged floating tunnel pipe section attitude test method comprises the steps that the bracket and the background plate are manufactured, the background plate is fixedly installed on the bracket, the bracket is fixedly installed on the model pipe section, and the model pipe section is placed in the water pool; initial data of the characteristic points are recorded by using the image acquisition device to level the attitude of the pipe section; the water pool is filled with water to ensure that the characteristic points are located above the water surface; and the working condition test is carried out, and the change of the positions of the characteristic points is recorded by the image acquisition device.

The invention relates to the field of detection of filter membranes, and particularly relates to a trapping efficiency and resistance detection device for a filter membrane / filter cartridge. The trapping efficiency and resistance detection device comprises a main shell, wherein a mixing chamber part, a filter membrane / filter cartridge clamp pressing part, a clamp part, a testing part, a sampling part and a controlling part; the mixing chamber part is connected with the testing part; the filter membrane / filter cartridge clamp pressing part is connected with the clamp part; the testing part is connected with the sampling part; the mixing chamber part comprises a mixing chamber, a trapping efficiency detection solenoid valve and a resistance detection solenoid valve; two inlets, including anair inlet and an aerosol inlet, are formed in the mixing chamber; a high-efficient filter I is arranged at the air inlet; the trapping efficiency detection solenoid valve is connected with an outlet of the mixing chamber part; the resistance detection solenoid valve is connected with a high-efficient filter II; the resistance detection solenoid valve is connected in parallel with the trapping efficiency detection solenoid valve. The trapping efficiency and resistance detection device has the advantages of simpleness in structure and low cost, and moreover, the detection precision, the operation security and the service efficiency of detection personnel are greatly improved.

The invention relates to the technical field of test, and relates to a mechanical transmission gap measuring method for an angular displacement steering engine. The mechanical transmission gap measuring method for the angular displacement steering engine comprises the steps that a measuring device is connected and mechanical transmission gap is measured. According to the mechanical transmission gap measuring method for the angular displacement steering engine, the manufacture of high precision test equipment is omitted, which saves manpower, financial resources, material resources and time; the measurement accuracy is improved; and the test precision requirement of a new developed angular displacement steering engine is met.

The invention relates to an angular position feedback system for automatically testing step angle precision and a testing method. The angular position feedback system comprises an extended stepping motor controller, a coupling, an angular position sensor, an angular position indicator and an upper computer, wherein the extended stepping motor controller is used for controlling stepping drive of astepping motor, the angular position sensor is a synchro transmitter or a multistage rotary transformer, and the angular position sensor is used for being coaxially connected with the stepping motor through the coupling, synchronously outputting electric signal data corresponding to a step angle and sending the electric signal data to the angular position indicator; the angular position indicatoris used for converting the electric signal data acquired by the angular position sensor into actual step angle data and sending the actual step angle data to the upper computer; and the upper computerreceives and records the actual step angle data sent by the angular position indicator, compares the actual step angle data with the set step angle data of the stepping motor to be measured, and calculates to obtain the step angle precision. According to the invention, high-precision testing of the step angle precision can be realized, and the requirement of a user on step angle testing is met.

The invention belongs to the field of microwave testing and relates to a microwave anechoic chamber for third-order intermodulation and standing wave testing. The microwave anechoic chamber is composed of the main body of the anechoic chamber and the absorbing material arranged in the main body of the anechoic chamber. space, the surface of the shielding shell facing the closed space is provided with a shielding layer, the absorbing material is fixed on the shielding layer, the material of the shielding shell is steel plate, and the shielding layer The structure is a sandwich plywood, the inner and outer layers of the sandwich plywood are wood plywood, and the sandwich layer is aluminum foil. The microwave anechoic chamber of the present invention is not only low in cost, easy to process, unrestricted in the manufacture of the anechoic chamber space, and can be manufactured into a large-scale microwave test anechoic chamber, but also has high shielding efficiency, can shield magnetic fields, and forms a non-magnetic environment, which will not cause new problems for antenna testing. The intermodulation effect can meet the test accuracy requirements.

The invention discloses a projection-type point distribution position device of aircraft ground vibration experiment. The projection-type point distribution position device comprises a slide film, a card support, a card adjustment mechanism and / or light source projection equipment, wherein the slide film is provided with an airfoil profile line or a plurality of typical positioning points, sensorarrangement points are arranged at predetermined positions of the slide film, the card support is used for fixedly installing the slide film, the card adjustment mechanism is used for installing the card support and can drive the card support to move and / or rotate, and the light source projection equipment is used for allowing a light beam to transmit through the aerofoil profile line or the typical positioning points on the slide film and project an aircraft airfoil to be provided with sensors.

The invention provides continuous online monitoring equipment and method for concentration of fluoride in environment air. The equipment comprises a gas sampling system, a fluoride trapping system, asolution neutralizing system, a solution measuring system, a solution storing and delivery system and a main control system, and the gas sampling system, the fluoride trapping system, the solution neutralizing system, the solution measuring system and the solution storing and delivery system are connected in sequence through a pipeline. The online monitoring equipment integrates outdoor sampling equipment, laboratory analysis equipment and a data processing and calculating process, and online continuous monitoring can be automatically and remotely achieved. During on-spot detection, what is simply needed is to replace prepared liquor periodically, personnel do not need to be on duty, the monitoring working efficiency is greatly improved, the labor and material resources are saved, and thecontinuous online monitoring equipment and method have high application and popularization value.

The invention provides a no-load parameter detecting device for a DC motor and belongs to the field of motor no-load parameter detection, and solves the inconvenient use of a current switching operation order pallet in special circumstances. The no-load parameter detecting device comprises a frequency-domain signal acquisition module, a motor no-load starting voltage detection module, a motor no-load starting current detection module and a motor no-load speed measuring module. The frequency-domain signal acquisition module converts the operating current of the motor to be detected in a no-load state into a frequency-domain signal. The motor no-load starting voltage detection module and the motor no-load starting current detection module monitor the peak value of the frequency-domain signal. When the peak value exceeds a preset value, the supply voltage and the supply current are the motor no-load starting voltage and the motor no-load starting current respectively. The motor no-load speed measuring module selects the fundamental wave of the frequency-domain signal, reads out the frequency value of the fundamental wave, and obtains the motor no-load speed according to the frequency value and the number of pole pairs of the detected motor. The no-load parameter detecting device has the advantages of fast test speed, high measurement precision and low test error.

The invention discloses a self-adjusting clamp head for a macromolecular material multi-sample friction and abrasion tester for an oilfield, and belongs to the field of friction and abrasion testing devices. The self-adjusting clamp head comprises a transmission shaft, a cross shaft universal joint, an upper friction plate, a lower friction plate and a sleeve cylinder, wherein the upper end of the transmission shaft is fixedly connected with a rotary power shaft of the friction and abrasion tester, and the lower end of the transmission shaft is fixedly connected with the cross shaft universal joint; the lower end of the cross shaft universal joint is fixedly connected with the upper friction plate, a sample clamping hole is formed in the upper friction plate, and a sample is arranged in the sample clamping hole; the lower end of the lower friction plate is fixedly connected with a loading shaft, and the upper end of the lower friction plate is attached to the sample. The self-adjusting clamp head has the advantages that the requirement of friction and abrasion test on one or multiple macromolecular material samples with height size deviation at the oilfield site is met, and the loads on the samples are uniform; the structure is simple, and the testing efficiency is high.

The invention relates to the stability test device for the household appliances and the electric appliances for similar purposes, in particular to a stability test bed. The stability test bed is mainly composed of a frame platform, a test bed plate, a hand-operated inclination angle setting mechanism and a motor slow-rotation mechanism, wherein the hand-operated inclination angle setting mechanism is mainly composed of a screw transmission case, a limiting nut, a mounting frame, a connector, a supporting shaft, a supporting plate and a bearing block; the motor slow-rotation mechanism is mainly composed of a motor, a worm wheel-worm reduction box, a mounting plate and a transmission group; the test bed plate is connected to the upper surface of the supporting plate; the supporting shaft isfixed to the frame platform through the bearing block, and is capable of swinging and penetrates through the frame platform; the upper end of the supporting shaft is connected to the supporting platethrough a bolt; the motor slow-rotation mechanism is located on the lower surface of the supporting plate; the worm wheel-worm reduction box is fixedly connected to the upper end of the supporting shaft through the mounting plate; the screw transmission case is fixed to the lower surface of the frame platform through the mounting frame; and the lower end of the supporting shaft is articulated to a screw in the screw transmission case through the connector.

The invention relates to a load loading system for a hatch lock reliability testing device and a butterfly-shaped spring assembly selecting method of the load loading system, belongs to load loading technologies of a hatch lock, and aims at solving the problems that a load born by a lock ring changes widely when a load loading spring of a present hatch lock reliability testing device is stretched or compressed. An intermediate joint of a first guide rail is fixedly connected to the middle of the first guide rail, two first slide blocks are arranged at the two sides of the intermediate joint of the first guide rail respectively, and first connecting rods are connected to the slide blocks and a lock ring; a second guide rail is vertical to the first guide rail, and a second slide block, a butterfly-shaped sprig assembly and a load adjusting block sleeve the second guide rail successively; and a load adjusting rod is positioned over the second guide rail. The butterfly-shaped spring assembly is determined by determining an initial elastic coefficient of the spring assembly, establishing an initial function relation between FTH and VHK2, determining a correcting elastic coefficient of the butterfly-shaped spring assembly, and determining the number of spring leaves. The system and method are used for load loading in hatch lock reliability test.

The invention provides a reflection type multi-target targeting coordinate testing device and method, and relates to the field of photoelectric testing and weapon shooting range testing. The reflection type multi-target targeting coordinate testing device comprises a main body frame and an upper computer, wherein the testing device is composed of two linear lasers, two cylindrical reflectors, a four-side rectangular reflector, two L-shaped photosensitive diode coding arrays and two signal acquisition instruments; the two linear lasers are located at the two ends of the lower portion of the testing device respectively; a laser light source forms a fan-shaped light curtain at an angle of 90 degrees through the cylindrical reflectors; and the fan-shaped light curtain is subjected to mirror reflection through a rectangular reflector method to form a detection light curtain. The reflection type multi-target targeting coordinate testing device and method can be used for testing the targeting coordinates of a plurality of small-caliber bullets of a continuous firing weapon with high precision, and reliable data support is provided for research of a high-radio-frequency continuous firing weapon.

The invention relates to a load sensor of a multi-ring structure. The load sensor comprises two or more bearing rings, the bearing rings are sleeved from inside to outside successively, the adjacent bearing rings are connected via multiple spokes, and when the bearing rings bear a load, the spokes play a connection role rather than bearing the load, the bearing surfaces of the bearing rings are positioned in the same plane, and multiple resistance foil gauges are arranged in the circumferences of the bearing rings. The load sensor of the multi-ring structure has the following advantages that the size is reduced obviously, the thickness is reduced obviously to 1 / 10 of a traditional cylindrical sensor, the sensor of the invention can be applied to many fields not suitable for the traditionalload sensor as in the condition that the load is very high and the sensor needs to be extremely short; and the sensor is high in structural rigidity and stability, low in weight and convenient to process and install.

Disclosed is a fixing device for a round-bar stretching sample with a gap. The fixing device includes a base and two tip cones. The base is a cuboid with a groove and the bottom part of the groove is provided with a light hole. The two tip cones are arranged at the two sides of the base respectively and capable of penetrating through the base and moving horizontally. Conical tips of the two tip cones are at the same axis which is above the light hole. Cone parts of the tip cones both face the inner sides of the base. The fixing device is applied to testing of sample manufacturing and capable of ensuring that the diameter at the gap of a manufactured round-bar stretching sample with the gap meets design requirements. The fixing device is applied to sample measurement and capable of measuring diameters at the gap part of the sample before and after a test so that test precision requirements are met and accuracy and reliability of test data are ensured.

The invention discloses a method for detecting a shape of a large-diameter vertical shaft hole. The method for detecting the shape of the large-diameter vertical shaft hole comprises the following steps that the vertical shaft hole is regarded as two concentric shaft holes, the size of the diameter of the inner shaft hole is set, and the inner shaft hole is regarded as a perpendicular shaft hole; the center of the shaft hole is set as the origin of coordinates, a WE direction and an NS direction which are perpendicular to each other are determined on the circumference of the inner shaft hole to serve as coordinate axes, and the four intersection points with the circumference are X, X', Y and Y' respectively and are regarded as detection points; a logging instrument is arranged in a shaft mouth and is adjusted to be level, detection parameters are set, detection probes are lowered at the four detection points of the shaft hole respectively and are maintained to be in a natural sagging state, hole diameter detection is carried out by using ultrasonic waves along with the lowering of the probes, and distance curves of the four points to the wall of the shaft hole are obtained respectively; hole shape detection images formed by the four detection points are spliced in the WE direction and the NS direction, and lastly a complete shaft hole shape image is displayed. The method for detecting the shape of the large-diameter vertical shaft hole is especially suitable for shape detection of holes of large-diameter vertical shafts with high-concentration media.

The invention relates to a signal generation circuit for detecting electrical properties of a hall device, which comprises a main circuit power supply unit, a sine wave oscillation unit, a sine wave signal generation unit, a current signal generation unit and a voltage signal generation unit, the sine wave oscillation unit outputs sine waves, a singlechip controls the predetermined frequency of the sine waves output by the sine wave oscillation unit, the sine wave signal generation unit generates voltage control sine wave signals with adjustable amplitude and current control sine wave signals,the current signal generation unit and the voltage signal generation unit respectively output current and voltage signals required when detecting hall CT and PT and having the predetermined frequency(ranging from 0 to 1KHz) and adjustable amplitude. The invention also includes an adjustable direct current power supply unit which can output stable and adjustable direct current voltage for supplying a transmission device when in over-current or over-voltage protection regulation experiment. The signal generation circuit and the power supply unit can ensure the smooth output of sine waves, andhave advantages of relative small size and weight, convenient carrying and reduced costs.

The invention relates to a jig for checking the driving torque of a small and micro motor. Comprising a bottom plate, a first clamping mechanism and a second clamping mechanism are arranged above the bottom plate, the second clamping mechanism is fixed to the bottom plate through a Y-axis moving mechanism, the first clamping mechanism is connected with a Z-axis adjusting mechanism, and the Z-axis adjusting mechanism is fixed to the Y-axis moving mechanism; the device further comprises a fixed plate and a tension meter moving plate which are arranged on the two sides of the second clamping mechanism respectively, the fixed plate is fixed to the bottom plate through a first longitudinal adjusting mechanism, the tension meter moving plate is fixed to an X-axis moving plate through a second longitudinal adjusting mechanism, and the X-axis moving plate is fixed to the bottom plate through an X-axis adjusting mechanism. The fixed plate and the tension meter moving plate are provided with through holes, tension meters are respectively arranged on the through holes of the fixed plate and the tension meter moving plate in a penetrating manner, a rope is wound on the rope wheel, one end of the rope is connected with the tension meter fixed on the fixed plate, and the other end of the rope is connected with the tension meter fixed on the tension meter moving plate.

The invention discloses an underground irrigation suitable test community determining method, and relates to the technical field of agricultural water-soil engineering. The method comprises the stepsof preparation, specifically, a test area is selected, the test area is ridged up and irrigated with water; measuring, specifically, the test area is divided into a plurality of basic units, and the soil moisture rate is measured by sampling respectively; sorting, specifically, the adjacent basic units are combined according to the spatial position of the test area, and the corresponding soil moisture rate and the soil moisture rate variable coefficient are calculated; and result obtaining, specifically, a first equation is fitted on the treatment area and the corresponding soil moisture ratevariable coefficient, a second equation is fitted on the basic units and the corresponding soil moisture rate variable coefficient point of a combined maximum treatment area, a tangent line of the second equation tangent to the first equation is obtained, and the suitable treatment area is obtained. The test precision requirement can be met by using the method to determine the test community area,meanwhile, unnecessary labor and financial investment can be reduced, and the method has the crucial meaning on the standardized popularization and data containment of future irrigation tests.

The invention discloses a suspension tunnel pipe section attitude measurement device, a test system and a test method. The measurement device includes a bracket for fixedly connecting with a suspension tunnel model pipe section, a background plate fixedly connected to the bracket, and a background plate provided on the background plate. At least two feature points, and an image acquisition device for performing real-time image acquisition on the feature points; the test system includes a pool, a model pipe section, and any of the measurement devices, the model pipe section is placed in the pool, and the support of the measurement device is fixedly installed on the model The test method is to make a bracket and a background plate; the background plate is fixedly installed on the bracket, the bracket is fixedly installed on the model pipe section, and the model pipe section is placed in the pool; the initial data of the feature points are recorded by the image acquisition device, and the The attitude of the pipe section is leveled; the pool is filled with water to ensure that the feature points are located above the water surface, and a working condition test is carried out, and the image acquisition device is used to record the position changes of the feature points.