129results about How to "Solve the unmeasurable" patented technology

The invention relates to a method for controlling an index time-varying slide mode of flexible spacecraft characteristic shaft attitude maneuver, and belongs to the technical field of spacecraft control. The method comprises the steps that firstly, a system dynamically equivalent model, a dynamic model and a flexible vibration model are established under a spacecraft system, then, the vibration frequency and the damping ratio parameter of a closed loop system with the index time-varying slide mode control law are calculated, and a single-shaft multi-modality filtering input shaping device with a characteristic shaft as a rotary shaft is designed according to the designing method of the single-shaft input shaping device to restrain flexible vibration in three-shaft motion. Meanwhile, a state observer is designed to estimate flexible modal information in real time, and the method for controlling an output feedback index time-varying slide mode is formed. At last, saturability analysis is conducted on control torque so as to satisfy the physical saturation constraint of the control torque. By means of the method, the application range of existing input shaping is expanded, the input shaping technology is expanded from single-shaft maneuver to three-shaft maneuver, the self-robustness of filter input shaping is enhanced, and the purpose that the attitude maneuver path of the spacecraft is the shortest is achieved.

The invention relates to an overlong workpiece linearity detection device driven by a composite micro-feeding axis. A guide rail is fixedly connected to an experiment table lathe bed; the guide rail is connected with a sliding table in a sliding and matching mode; four laser interferometers are arranged on a test table support which is arranged on one side of the guide rail; a drive device consisting of a vertical linear motor and a horizontal linear motor is arranged on the front end surface of the sliding table; reflecting mirrors are respectively arranged on the upper side, the lower side, the left side and the right side of a rotor of the vertical linear motor; the first to fourth laser interferometers are used for respectively reflecting laser beams sent by the first to fourth laser interferometers back to the corresponding laser interferometers through the first to fourth reflecting mirrors; a data control system receives data of the laser interferometers in two directions to acquire deviation directions and deviation amount of the linearity of the guide rail in the two directions; and the data control system transmits mobile signals to a driving unit which transmits pulse signals to the vertical linear motor and the horizontal linear motor, and thus the vertical linear motor and the horizontal linear motor move to correct linearity errors in the vertical and horizontal directions.

A hydrodynamic test model transverse moment measuring device comprises a pair of fixed connection plates (1), a connection steel rope guide pulley (2), an unloading unit fixing shaft (3), an unloading weight (4), an unloading unit sliding seat (5), a supporting unit fixing shaft (6), a supporting unit sliding seat (7), a supporting spindle (8), a supporting spindle guide (9), a right-angle adapter seat (10), a pitching direction rotating bracket (11), a cross connection shaft (12), a transverse direction rotating bracket (13), a transverse angle adjustment sheet (14) and a six-component measuring balance (15). The hydrodynamic test model transverse moment measuring device has the advantages that a model can freely move in the pitching direction in a hydrodynamic test, a needed transverse angle can be kept, the blank of a water test model transverse moment measuring measure in a towing tank is filled in, the transverse moment of a zero-speed model can be measured, and the transverse moment of a high-speed model can also be measured.

The invention discloses a phase delay extraction and compensation method for PGC phase demodulation. A sinusoidal phase modulation interferometric signal is converted into a digital interferometric signal through an analog-to-digital converter after amplifying and filtering, first-order, second-order and fourth-order harmonics of the digital interferometric signal are subjected to orthogonal downmixing simultaneously, and three pairs of orthogonal harmonic amplitude signals are obtained. Phase delays are extracted from the three pairs of orthogonal harmonic amplitude signals, and corresponding phase delay correction coefficients are calculated out by using the phase delays. The phase delay correction coefficients are multiplied by the absolute harmonic amplitude signal equal to the sum ofthe absolute values of the orthogonal harmonic amplitude signals to obtain new harmonic amplitude signals which are not affected by the phase delays, and then a to-be-measured phase is obtained through antitangent operation. The problems are solved that in the PGC phase demodulation technology, phase delay is difficult to measure and non-linear errors caused by the phase delay are difficult to compensate for in real time, the phase measurement accuracy is improved, and the method is widely applied to the technical field of sinusoidal modulation interference.

The invention relates to a large-diameter stray light measuring device and a testing method. The large-diameter stray light measuring device comprises a target simulator, a spherical collimator tube, a detection system and a data acquisition and processing system. The target simulator is disposed on an incident path of the spherical collimator tube. An optical system to be detected is disposed on an emergent path of the spherical collimator tube. The detection system is disposed on an image surface of the optical system to be detected. The detection system is connected with the data acquisition and processing system. The large-diameter stray light measuring device and the testing method can be used to effectively assess stray light inhibiting ability of the optical system structure.

The invention discloses an indirect measurement method based tool parameter calibration method for a high-precision drilling robot, which relates to two TCPs (tool center points), wherein one TCP can be determined by directly measuring while the other TCP is a virtual tool point on the axis of a tool of a drilling device. A calibration flat plate is drilled to fix the position of the virtual tool point when the tail end of the robot is controlled to reach a certain position, and a robot kinematic model is used for determining parameters of the virtual tool point. Procedures which are difficulty in guaranteeing of precision of point alignment and the like during tool parameter calibration of a traditional robot are avoided, so that calibration precision is improved. Application range of the method is widened, the problem that the virtual tool point cannot be measured is solved, the whole calibration process can be programmed to be fixed, and corresponding program parameters can be modified for adaption even productive tasks change, so that application of the method in industrial fields can be facilitated.

The invention belongs to the technical field of electric appliance control and coal mine safety, and relates to an S-shaped pitot tube based wind direction and velocity measurement device and method used for monitoring gas back flow in coal mine environments with explosive gases such as coal dust and the gas. The measurement device comprises an S-shaped pitot tube, reducing direct connections, a differential pressure transducer and a microcontroller. By the device and method, the problem that wind velocity transducers widely used in the field of coal mine safety monitoring at present can only measure unidirectional wind velocity and cannot judge wind directions is solved; by the design according to the differential pressure principle, a present wind current can be accurately judged whether to be ingoing wind or outgoing wind, and the wind velocity can be measured accurately. Besides, the device and method is not just limited to the field of coal mine safety monitoring, but also applicable to measurement of bidirectional wind speed in pipeline forms. The device is free of movable parts, simple and reliable in structure, accurate in measurement, good in long-term stability, high in anti-electromagnetic interference capability, dustproof and anti-blocking, and suitable for high-humidity and high-dust-content underground environments.

The invention discloses a reactor pressure vessel experimental simulation body for a pressurized water reactor water loss accident. The reactor pressure vessel experimental simulation body comprises areactor pressure vessel simulation body mass and a reactor core detection apparatus, wherein the reactor pressure vessel experimental simulation body mass comprises a pressure vessel simulation bodyand a bracketplant simulation body located in an inner cavity of the pressure vessel simulation body, the bracketplant simulation body is provided with a reactor core assembly simulation body inside,the pressure vessel simulation body comprises an upper end enclosure, a middle cylindrical barrel and a lower end enclosure, the reactor core assembly simulation body comprises a casing pipe and an electric heating element, the top of the casing pipe is a closed end, the bottom of the casing pipe is an open end, the bottom of the casing pipe extends downwardly and extends out of the lower end enclosure, and a data acquisition end of the reactor core detection apparatus is inserted into the casing pipe from the open end of the casing pipe. By adopting the reactor pressure vessel experimental simulation body for the pressurized water reactor water loss accident, the sealing performance between the reactor pressure vessel barrel and the reactor core can be prevented from being influenced by an acquisition route of the detection apparatus of the reactor core assembly simulation body.

An auxiliary measuring device of torque spanner used in narrow region in ship is composed of an electric torque spanner and its control indicator, and a torque transfer unit with input gear, intermediate gear and output gear.

The invention discloses a swinging detection device for a vertical shaft cage guide steel wire rope. The swinging detection device comprises a photoelectric detection system, wherein the photoelectric detection system comprises a parallel light source generator and a photoelectric conversion device, the parallel light source generator and the photoelectric conversion device are respectively positioned at the two opposite sides on the well wall in the position at the same height as a point to be measured, in addition, the parallel light source generator is aligned with the photoelectric conversion device, the vertical shaft cage guide steel wire rope part is positioned between the parallel light source generator and the photoelectric conversion device, and the photoelectric conversion device is connected to an upper computer. Through the adoption of a photoelectric non-contact measuring mode, the dynamic swinging of the middle part of the cage guide steel wire rope in one or a plurality of hosting strokes of a hosting machine can be effectively detected, the problem that the key swinging of the vertical shaft cage guide steel wire rope cannot be measured is solved, meanwhile, under the regulation of a multi-freedom hanging centering device, the emission centering precision can be ensured, the structure is simple, the installation and the use are convenient, and the measuring efficiency is high.

The invention relates to a test system for simulating transient unloading of excavation of a chamber face under different geostress conditions. The test system is capable of simulating a transient unloading process of excavation of the diverticulum face to complete transient unloading of surrounding rocks with different excavation surface shapes under different geostress conditions and different unloading rates, and can record the whole process of the overall displacement variation of the surrounding rocks of a chamber. The test system comprises an in-situ stress simulation device, a transientunloading device and a surrounding rock overall displacement monitoring device. The in-situ stress simulation device is composed of a ground stress loading device and a chamber surrounding rock model. Four loading surfaces in the chamber surrounding rock model directly contact four hydraulic heads of the ground stress loading device. The ground stress loading device and the chamber surrounding rock model are used together and placed on the same plane perpendicular to a horizontal plane. The transient unloading device and the surrounding rock overall displacement monitoring device are placed in the front and rear directions of the plane respectively. The test can indirectly solve the problem that the displacement of surrounding rocks cannot be measured at the moment of excavation and unloading of drilling and blasting in actual engineering.

The invention relates to a detection tool for the groove medium diameter of a disc insulator. The detection tool comprises an upper beam and a first measuring arm and a second measuring arm which are respectively arranged at the two ends of the upper beam; one end, far away from the upper beam of the first measuring arm is provided with a first positioning pin; a tuning rod and a detection positioning pin are arranged on the second measuring arm; the two ends of the tuning rod are respectively provided with a second positioning pin; a guide pipe is fixedly positioned on the second measuring arm; the center line of the guide pipe is parallel to the center lines of the first positioning pin and the detection positioning pin; the tuning rod is arranged on the guide pipe along a moving sleeve; a sliding rod is positioned inside the guide pipe in a moving and guiding manner; one end of the sliding rod is provided with a detection end surface in contact matching with a measuring head of a dial indicator; a positioning hole is formed in the circumferential direction of the sliding rod; a third positioning pin is inserted into the sliding rod through the positioning hole; the detection positioning pin is inserted into the sliding rod; a slot hole is formed in a pipe wall of the guide pipe; and one end of the guide pipe is provided with a socket used for inserting and fixing the dial indicator. By the detection tool, the problem of incapability of measuring the groove medium diameter of an annular groove on an external edge of the disc insulator is solved.

The invention relates to a mechanical type end surface sealing specific pressure measuring device for a high-speed liquid oxygen turbine pump. The mechanical type end sealing specific pressure measuring device is used for accurately measuring end surface sealing specific pressure data. The device comprises a sealed static ring assembly, a movable ring, a first shaft sleeve, a housing, a shaft, a pressurizing mouthpiece, a sealing gasket, a second shaft sleeve and a pressure sensor. According to the mechanical type end surface sealing specific pressure measuring device of the invention, the problem that specific pressure data cannot be accurately measured in original sealing design can be solved, a piston shaft can be stressed in a balanced manner, and measurement accuracy is improved. The mechanical type end surface sealing specific pressure measuring device is suitable for the mechanical sealing of the high-speed oxygen turbine pump and can meet the requirements of a variety of liquid and gas media; the mechanical type end surface sealing specific pressure measuring device is easy to operate and simple in processing, and can adapt to engine operating conditions; and the mechanical type end surface sealing specific pressure measuring device can meet sealing end surface specific pressure tests for product tests and has a wider application range.

The invention discloses a device used for observing of a ventilating cavitation flow-field regularity, and belongs to the technical field of flow measurement. The device comprises a pulsed laser, a cavitation water tunnel, a test component, fluorescent paint and a CCD camera. The pulsed laser emits a sheet light source, wherein the wave length of the sheet light source is L1. The surface of the test component is coated with the fluorescent paint. The sheet light source emitted by the pulsed laser irradiates the fluorescent paint on the surface of the test component, and light with the L2 wave length is reflected. The test component is arranged inside the cavitation water tunnel. The front end of the test component faces the water flow direction. The pulsed laser is arranged above the cavitation water tunnel. A light outlet of the pulsed laser directly faces to the test component, and the test component is placed in the plane, wherein the central axis is placed in the plane which is placed with the sheet light source emitted by the pulsed laser. An optical axis is perpendicular to the plane which is placed with the sheet light source emitted by the pulsed laser. The light reflecting phenomenon in a flow-field can be solved, and the device is of the great significant for improving the PIV accuracy.

The invention discloses a testing system for testing the thermoelectric conversion efficiency of a miniature temperature-difference battery and a method thereof. The testing system for testing the thermoelectric conversion efficiency of the miniature temperature-difference battery comprises three parts which are a testing fixture, a vacuum system and a controlling and testing circuit system. A miniature temperature-difference battery to be tested is placed in the testing fixture, and the testing process is positioned in a vacuum environment. According to the testing system, current flowing through a heating block can be regulated and controlled by the controlling and testing circuit system, the control of the flow rate of heat in the testing process and the collection of relevant testing data are realized, the testing data are also transmitted to a microcomputer in real time, and the controlling of the entire testing process, the processing of the testing data and the real-time displaying of the testing data and a calculating result on a computer display are realized by the microcomputer. According to the system, the accurate measurement of the thermoelectric conversion efficiency of the miniature temperature-difference battery can be realized.

The invention relates to a detection device, in particular, a detection device for measuring the contour of a non-circular inner hole and a detection method. The detection device comprises a workbenchand a supporting frame fixed onto the workbench; the supporting frame is provided with a laser displacement sensor; the workbench is provided with a platform for carrying a part to be tested; positioning blocks used for clamping the part to be tested and arranged at two sides of the part to be tested are located above the platform; the positioning blocks comprise a first V-shaped positioning block and a second V-shaped positioning block which are slidably arranged on the workbench; the positioning blocks are connected with driving devices for driving the positioning blocks to move; the laserdisplacement sensor is located above the part to be tested; and at least one of the laser displacement sensor or the platform is rotatable. According to the detection device of the invention, laser oblique line projection measurement is adopted to measure the inner diameter of an ellipse, so that the radial length of the contour of the ellipse can be measured through indirect conversion, and failure to realize measurement which is caused by a condition that the laser displacement sensor is larger than the inner hole can be avoided.

The invention relates to a bearing current protection device of a three-phase cage induction motor, is used for measuring the bearing current of a three-phase cage induction motor which provides power for an inverter and comprises a signal collection circuit, a data processing module e and an execution protection element; wherein, a data collection circuit collects the current signals of common mode and ground wires, sends the signals to the data processing module, compares the currents of the common mode and the ground wires to determine the distribution of bearing current, test whether the grounding system is good and carry out the power-cut protection when the protection needs to be implemented. The bearing current protection device includes the main program flows of judging from (initialization) 1 to (current sampling) 2, (virtual value calculation) 3, (common-mode current calculation) 4 and to (whether faults exist); if yes, entering the (power-cut protection); if not, entering the (ending). The bearing current protection device has the beneficial effects of small volume and practicality and solves the problem that the bearing current can not be measured.

The embodiment of the invention provides an unsupervised joint modeling method based on an ARM architecture chip. The method comprises the steps of providing a trusted execution environment based on an ARM architecture chip, a distributed unsupervised machine learning framework and a privacy computing interconnection system, wherein the trusted execution environment based on the ARM architecture chip comprises a plurality of servers based on the ARM architecture chip, one server serves as a service party, and the other servers serve as computing parties; realizing local data-based unsupervised model training of multiple computing parties locally, interacting with a parameter service party, realizing multi-party local model security aggregation, and constructing a global model; and enabling the service party and each computing party to perform data transmission and model parameter aggregation through a privacy computing interconnection system constructed based on MPC, a trusted execution environment and an encrypted connection mode, so that the privacy of related data is ensured. While privacy data of all parties are protected, multi-party data joint modeling is realized, and multi-party data islands are broken through.

The invention relates to a liquid level-type settlement observation auxiliary apparatus and a usage method thereof. According to the invention, an adjustable tripod is used for indirectly inducing a measure position of a measuring head from equipment or a building, direct measure of the measuring head is changed to indirect measure, so that problem of difficult measure due to different visual field scope of a measure basic point and the measuring head can be solved. The liquid level-type settlement observation auxiliary apparatus comprises a water injection column, a fixed block, the tripod and a water pipe. The top of the water injection column is a tunnel-shaped taper port, an outlet pipe communicated to the taper port is arranged at side surface; the water injection column is arranged on the tripod, an leveling-aid spherical level meter is arranged on the tripod, a location hole used for fixing the measuring head is arranged in the fixed block, a fastening screw used for tightly screwing and fixing the measuring head is arranged at one side, a water discharge pipe is arranged at opposite side, the water discharge pipe is communicated to a vertically arranged inlet pipe at lower side of the fixed block, and a water pipe is connected between the inlet pipe and the water discharge pipe. The invention also provides the usage method of the apparatus, the apparatus has simple structure, and the enforcement method is simple.

The invention discloses a convenient-to-use recording pen assembly for connecting an electric fusion pipe. The convenient-to-use recording pen assembly comprises a scale plate. A clamping device and a positioning device are arranged on the scale plate. A sliding chute is formed in the middle of the scale plate in the length direction of the scale plate. A sliding sleeve is arranged in the sliding chute, and comprises a guiding block and a positioning column. The guiding block is arranged in the sliding chute. The positioning column is connected with the upper end of the guiding block. The positioning column is clamped on the upper end surface of the sliding chute. Rack slots are respectively formed in two opposite inside surfaces of the inner side of the sliding chute of the scale plate, and are formed with the sliding chute in the same direction. Fixed racks are arranged on the vertical side surfaces in the rack slots. Positioning blocks are arranged on two sides at the lower end of the guiding block. Rotating gears are arranged in the positioning blocks. The interior of the positioning column is hollowed to form an accommodating cavity. A retractable spring is arranged in the accommodating cavity. A recording pen is arranged in the sliding sleeve, is positioned in the accommodating cavity and is provided with a positioning ring. The positioning ring is positioned at the upper end of the retractable spring. The convenient-to-use recording pen assembly is stable to translate, and the recording pen can be always arranged vertically, so that the recording is more accurate.

The invention discloses a pipeline test method and system. At first, analysis is performed according to the finite element analysis method to obtain the maximum displacement point and the stress dangerous point of the pipeline, and then, accelerated speeds at the maximum displacement point and the stress dangerous point of the pipeline are detected separately with a three-directional acceleration sensor, measurement is effectively performed for the maximum displacement point and the stress dangerous point of the pipeline, the measurement result is accurate; and the three-directional acceleration sensor has the anti-interference and shielding performances, so the problem of inaccurate measurement result caused by external interferences can be solved; and the three-directional acceleration sensor can be arranged on a small-diameter pipeline, so the measurement of the small-diameter pipeline can be realized; the broken or short-circuit failure is not easy to occur, so the problem that the measurement cannot be performed due to the broken or short-circuit failure in the prior art can be solved.

The invention discloses a measuring method and apparatus for the size of a raceway of a one-way sleeve in a one-way clutch of an automobile starting engine and provides a simple, convenient and rapid method for measuring the size of the raceway of the one-way sleeve, which can be used for directly measuring on a production field, stopping unqualified products and increasing the production efficiency. The measuring apparatus provided by the invention comprises a locating core 1, an irregularly-shaped locating ring 3, a joint screw 4, a support 5, a long pin 6, a measurement oscillating bar and a bottom plate 8, wherein the support 5 is arranged on the bottom plate 8, the irregularly-shaped locating ring 3is jointed onto the support 5 by using the joint screw 4, the locating core 1 is inserted to the irregularly-shaped locating ring 3, the measurement oscillating bar 7 is fixed on the support 5 by using the long pin 6, and a meter frame and a dial indicator are well assembled together and fixed on the bottom plate 8. The measuring apparatus can be used for measuring the sizes of different raceways of one-way sleeves. The measuring method and apparatus are applied to a production field, are remarkable in effect and are used for solving the problem that an irregularly-shaped raceway of the one-way sleeve cannot be measured.

The invention relates to the technical field of oil and gas field development, and discloses a measurement method for an oil-water two-phase interference pressure gradient. The method comprises the following steps that: a1: obtaining the pore structure model of porous media; a2: importing the pore structure model into phase field simulation software, and setting phase field simulation basic parameters to obtain a phase field model of the porous media; a3: in the phase field model, setting the outlet end pressure and the inlet end pressure of the pore structure model, carrying out phase field simulation on the phase field model, and obtaining the oil-water two-phase interference pressure gradient under given water saturation; and a4: changing the inlet end pressure of the pore structure model, and repeating the step a3 to obtain the oil-water two-phase interference pressure gradient under different water saturations. The measurement method disclosed by the invention is convenient, effective and high in operability, can truly reflect the permeability rule of two-phase fluid in the porous media and can provide technical support for the accurate prediction of oil deposit development dynamics and the design of a development and regulation scheme.

The invention relates to a method for measuring a modulation transfer function of a telephoto lens through concave mirror imaging, and a device for realizing the method. The method comprises the following steps: 1) arranging a light source, a light uniform plate and a reticle at an image side of a detected lens; 2) arranging a concave reflection mirror at an object side of the detected lens; 3) distributing a plurality of image sensors on a focal plane of the concave reflection mirror; 4) adjusting the position of the reticle and the position of the detected lens until the reticle is arranged in the focal plane of the detected lens; 5) calculating MTF values corresponding to different line pair densities through corresponding digital image processing units; and 6) generating a modulation transfer function curve of the detected lens through an MTF data analyzer. The method and device adopt a mode that a plurality of image sensors share one concave reflection mirror as the optical imaging lens, can be used for small-field-angle telephoto lens multi-point modulation transfer function measurement, not only are fast in measurement speed, but also solve the problem that the small-field-angle telephoto lens cannot be measured due to structure interference of a plurality of optical lenses.

The invention relates to a non-contact freely-locatable method for measuring the deformation of a cylinder, which is characterized in that: the specific measurement process comprises the following steps: a fixture for the deformation of the cylinder is sheathed on the cylinder so that the upper part of the T-shaped fixture is lapped at the edge of the cylinder and the lower part of the T-shaped fixed is extended into the cylinder and is jointed therewith; the fixture is filled into the end of the cylinder and is provided with an elastic soft medium; the fixture is put into the cylinder of an engine after being pasted with the soft medium so that the inner wall and the outer edge of the cylinder are located; after that, a measuring head is directly clamped in the fixture for the deformation of the cylinder; and after ensuring the measuring head is clamped, the measuring head and the cylinder are concentric so as to start to measure. The invention is convenient for free fixation, is not limited by the type of the engine and the length of the cylinder, can measure the cylinders of the any engines, and can save time, labor and great development cost.