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

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 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 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 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 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.

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.