98 results about "Laser displacement meter" patented technology

The invention relates to the technical field of laser displacement meters, discloses a calibration method of a laser displacement meter for a Beidou device based on multi-data coupling, and effectively solves the problems of time delay compensation and data synchronization of cooperative work of multiple devices in a dynamic environment. According to the invention, when a carrier moves at a high speed or environmental parameters suddenly change, submillimeter-level positioning precision can still be maintained, meanwhile, data processing delay is controlled within a millisecond-level range, the reliability of a measurement system under a complex working condition is remarkably improved, and through double marking of a GNSS timestamp and a local clock, the measurement precision is greatly improved. And an accurate time deviation observation value is provided for a subsequent time delay compensation algorithm, so that a time-space unified data basis is established in a data preprocessing stage, and the feasibility of multi-source heterogeneous data fusion is remarkably improved.

The invention relates to the technical field of ceramic intelligent manufacturing, in particular to a ceramic firing process thermal deformation intelligent prediction and self-adaptive temperature precise regulation and control system, which comprises a multi-source sensing module (a thermal infrared camera array, a temperature sensor, a laser displacement meter and a powder characteristic analyzer); a hybrid prediction model (a space-time convolutional neural network constrained by a physical mechanism); and the self-adaptive temperature control actuator comprises a partitioned burner group, a quenching / slow cooling pipeline and a gas-air volume decoupling controller. According to the scheme, through a multi-mode perception-hybrid modeling-dynamic optimization full-process closed-loop architecture, the single-point technical limitation of existing patents is broken through, and the zero-defect precise manufacturing target of ceramic firing is achieved.

The invention relates to a displacement and pneumatic pressure synchronous measurement method and system, an external trigger system triggers a multi-channel dynamic signal data acquisition system and a pressure scanning valve to synchronously start measurement, and the pressure scanning valve and a laser displacement meter can synchronously measure the pressure and displacement of all pressure measurement points; the pressure scanning valve and the single-channel piezoresistive differential pressure sensor can synchronously measure pressure information of a reference pressure measuring point, and the pressure information serves as accurate basic signal reference data. Time difference calculation is carried out on pressure signals of a reference pressure measuring point measured by the single-channel piezoresistive differential pressure transducer and the pressure scanning valve through a cross-correlation method and a manual alignment method, so that time sequence alignment is carried out on a displacement signal measured by the laser displacement meter and a pneumatic pressure signal measured by the pressure scanning valve. The time difference of the measured signals is calculated accurately, the signal time sequence consistency can be remarkably improved, the accuracy of a final result obtained through synchronous measurement is higher, and more reliable data support is provided for subsequent vibration analysis.

The invention relates to the technical field of informatization and intelligent construction, and provides a concrete structure disease real-time visual perception method and handheld equipment. The handheld equipment comprises a data acquisition system and a data analysis system; the data acquisition system comprises a visual sensor, a miniature industrial personal computer, a laser displacement meter, a wireless transmission module, a low-power illuminating lamp and a power supply module; the data analysis system comprises a multi-type disease identification module and a fine crack high-precision quantification module; the multi-type disease identification module adopts a lightweight Faster-RTDETR deep learning model; the fine crack high-precision quantization module adopts a fine crack high-precision segmentation Half-AU2 model, and adopts an eight-direction search method to calculate crack width, length and area information. According to the method, the concrete structure diseases can be better and visually displayed.

The invention discloses an omni-directional high-precision inclination angle monitoring device based on a laser displacement meter and a monitoring method of the omni-directional high-precision inclination angle monitoring device. The monitoring device comprises a support assembly, a transverse gravity balancing rod is arranged on the support assembly, a longitudinal gravity balancing rod is arranged on the transverse gravity balancing rod, a plumb bob vertical rod is arranged on the longitudinal gravity balancing rod, a gravity balancing block is arranged at the short end of the lower portion of the plumb bob vertical rod, and a laser reflecting plate is arranged at the long end of the upper portion of the plumb bob vertical rod. The support assembly is further provided with a transverse laser displacement meter and a longitudinal laser displacement meter which are opposite to the laser reflecting plate. The monitoring device is adopted in the monitoring method. The inclination degree of the monitoring device after slight inclination is obtained as delta L / H, and the azimuth angle A of the angle change direction of the slope is calculated through an anti-trigonometric function # imgabs0 #. The method has the beneficial effects that the inclination condition of the surface of the landslide and the azimuth angle of the inclination angle change direction can be dynamically detected.

The invention relates to the technical field of strain monitoring, and provides a jacking pipe convergence and strain monitoring method, which realizes omnibearing monitoring of a jacking pipe structure and environment by reasonably deploying a vibration sensor, a fiber grating strain gauge, a laser displacement meter and a gas and temperature and humidity sensor, and avoids the potential safety hazard of omission caused by incomplete monitoring information. Multi-dimensional data is transmitted to a processing node in real time, it is ensured that the data is accurately transmitted in the data transmission process, meanwhile, comprehensive preprocessing is conducted on the multi-dimensional data, and a solid foundation is provided for subsequent accurate analysis; the convergence strain information of the jacking pipe can be accurately generated by extracting the characteristics of the multi-dimensional data; according to the convergence strain information of the jacking pipe, the operation state of the heat distribution pipeline is scientifically evaluated and accurately predicted, early warning and visual display are carried out in time, safe and stable operation of the heat distribution pipeline is effectively guaranteed, accident risks are reduced, and economic losses and social influences are reduced.

The invention belongs to the technical field of aerospace force measurement test power measurement, and discloses a three-component micro-load balance calibration device and a three-component micro-load balance calibration method. The three-component micro-load balance calibration device comprises a pulley, an air bearing, a vibration exciter, a loading head, a calibration support rod, a six-degree-of-freedom adjusting mechanism, a laser positioning source, a nylon rope, a spherical loading point and the like. The six-degree-of-freedom adjusting mechanism is connected with the balance, the balance is fixedly connected with the calibration supporting rod, one end of the calibration supporting rod is fixedly connected with the balance, the other end of the calibration supporting rod is connected with the loading head, the loading head is connected with the pulley through the nylon rope, the air bearing is arranged in the pulley, the vibration exciter is arranged on the pulley base, and the laser positioning source is installed on the support. And the light source of the laser displacement meter can be projected to the loading head. According to the invention, the balance calibration of the micro-load balance with the measuring range within 10mN can be realized, and the defects that the loading cannot be realized due to the too small measuring range of the micro-load balance, the calibration result of the micro-load balance is influenced due to the too large uncertainty of the calibration system and the like are overcome.

The invention relates to the technical field of tunnel repair, in particular to a tunnel post-earthquake repair system and a tunnel post-earthquake repair method. The tunnel post-earthquake repair system comprises a waterproof plate, a lining ring, a reinforcement meter, a concrete strain meter and a laser displacement meter. The waterproof plate is adhered to the original tunnel lining, the lining ring is arranged on the inner side of the original tunnel lining, and the lining ring abuts against the waterproof plate; the steel bar meter, the concrete strain meter and the laser displacement meter are all arranged on the lining ring. Through the arrangement, the original lining with the cracks can still exert the bearing capacity, and through the arrangement of the steel bar meter, the concrete strain meter and the laser displacement meter, the magnitude of force transmitted to the lining ring by the original lining with the cracks can be effectively monitored, and the mechanical state of the lining ring can be effectively known.

The invention relates to the technical field of open caisson construction, in particular to an open caisson construction method suitable for a soft soil foundation, which comprises the following steps: excavating a foundation pit, pre-reinforcing the foundation, constructing a cushion layer, manufacturing an open caisson in sections, arranging a monitoring system, sinking in stages and partial pressure, dynamically adjusting hydraulic jacking force and finally sinking and sealing bottom. Wherein dynamic adjustment of hydraulic jacking force is realized through arrangement of a monitoring system, which is a main invention point of the invention, during sinking, data is fed back through a tilt angle sensor, a laser displacement meter and an earth pressure sensor, the jacking force is corrected according to a formula, and dynamic correction and emergency control are combined; accurate and intelligent control of open caisson construction is achieved, and the safety, efficiency and quality of soft soil foundation open caisson construction are improved.

The invention discloses a zero-damping magnetic suspension wind tunnel segment model test device, and relates to the technical field of bridge wind resistance experiments, the zero-damping magnetic suspension wind tunnel segment model test device comprises a segment model, a laser displacement meter, an adjusting device and a guide rail device, the adjusting device comprises a damping adjusting device and a magnetic suspension adjusting device, the damping adjusting device is connected with four corners of the segment model, the magnetic suspension adjusting device is arranged below the segment model, the damping adjusting device is connected with the guide rail device in a clamping manner, and the guide rail device is fixed on a top plate and a bottom plate of a wind tunnel laboratory. Magnetic suspension replaces traditional spring suspension, zero-damping suspension of the segment model in a wind tunnel test is achieved, and therefore dampers can be flexibly arranged according to test requirements, and the test damping ratio can be adjusted in a stepless mode; in addition, according to the testing device, the section proportion of the supporting device is greatly reduced, interference to airflow is smaller, and the quality of an obtained wind field is better.

The utility model discloses a tunnel monitoring device which comprises a settlement monitoring mechanism, a laser displacement meter, a multi-point displacement meter, a steel bar meter, an osmometer and a soil pressure meter, the relative vertical displacement of each measuring point of the tunnel is monitored through the static level gauge, the tunnel vault sinking and peripheral convergence are monitored through the laser displacement meter, the internal space position change of the tunnel surrounding rock is monitored through the multi-point displacement meter, and the steel bar stress of the tunnel surrounding rock is monitored through the steel bar meter. The seepage pressure inside the tunnel foundation soil body is monitored through the osmometer, and the pressure stress of the soil body outside the tunnel surrounding rock is monitored through the soil pressure meter, so that monitoring measurement and informatization construction are achieved, the actual geological condition of the tunnel can be mastered in time, and the stress characteristics and deformation conditions of the tunnel surrounding rock and the supporting lining structure can be mastered; therefore, collapse, large deformation and other disaster symptoms can be found as early as possible, measures can be taken in time, and construction safety is guaranteed.

The utility model discloses a coal mine pressure data combined monitoring system. Comprising a multi-point displacement meter installed in a coal mine tunnel top plate in a drilling mode, an anchor rod dynamometer installed on an anchoring part of the coal mine tunnel top plate or / and a tunnel side wall, laser displacement meters fixedly installed on the two sides of a coal mine tunnel bottom plate or / and the tunnel side wall, and a drilling stress meter installed in the coal mine tunnel side wall in a drilling mode. The multipoint displacement meter, the anchor rod dynamometer, the laser displacement meter and the borehole stress meter are respectively in communication connection with the data acquisition instrument, the data acquisition instrument is in communication connection with the underground monitoring information processor, and the underground monitoring information processor is in communication connection with the ground monitoring server. According to the utility model, the integrated monitoring of various mine pressure data of the coal mine tunnel is realized, the coal mine safety production is guided, the system is suitable for coal mine tunnel monitoring under different geological conditions, the data processing cost of coal mine safety monitoring is reduced, accidents caused by coal mine rock burst disasters are reduced, and the underground coal mine safety production is guaranteed.

The invention discloses an impact press-in test system based on a piezoelectric bimorph cantilever beam and a test method thereof. According to the invention, a piezoelectric bimorph cantilever beam is used as an actuator of a test system, and the piezoelectric bimorph cantilever beam is a macroscopic large-stroke piezoelectric actuator; a large-current high-voltage power supply is used for providing excitation voltage for a piezoelectric bimorph cantilever beam, large current rapidly charges a piezoelectric patch so as to generate high excitation voltage in an extremely short time, rapid bending deformation occurs, and a free end pressure head is pressed into the surface of a sample at a rapid impact speed; a force sensor and a laser displacement meter are adopted to form a measuring system, and force and displacement generated in the impact press-in process of a pressure head are measured in the same position at the same time; establishing a one-dimensional harmonic oscillator model, and calculating to obtain the real press-in load of the pressure head in the impact press-in process; according to the invention, the construction is simpler, the environmental adaptability and operability are strong, the requirement on the test environment is not very strict, and the test can be carried out under some complex conditions.

The embodiment of the invention provides a series GIS equipment foundation settlement monitoring system based on a laser ranging method.The series GIS equipment comprises a plurality of buttresses, the series GIS equipment foundation settlement monitoring system comprises a plurality of measuring units, and each measuring unit comprises two arm rods, a plurality of connecting rods and a plurality of connecting rods, each measuring unit is arranged between two adjacent buttresses, so that the tail ends of the two arm levers are positioned right above the two adjacent buttresses; the laser displacement meters are arranged at the tail ends of the arm levers to measure the distances from the arm levers to the corresponding buttresses in the vertical direction and send the measured values to the corresponding measuring units; the data receiving and processing module is used for receiving relative settlement of the adjacent buttresses of each measuring unit and calculating relative settlement and absolute settlement of all the buttresses relative to the reference buttress; wherein the relative settlement of the adjacent buttresses is obtained based on measured values of the laser displacement meters on the two sides of each measuring unit. Therefore, effective and accurate GIS equipment foundation settlement monitoring is realized.

The invention discloses a reinforced embankment rib deformation characteristic supergravity test method based on a PIV technology. A test device adopted by the method comprises a supergravity model box with an observation window, an industrial camera and an image processing system. The reinforced embankment model is arranged in the supergravity model box, the supergravity model box and the industrial camera are arranged in the supergravity geotechnical centrifuge, a lens of the industrial camera is aligned to the reinforced embankment model through an observation window on the supergravity model box, and an identification point is arranged on one side of the observation window of the reinforced embankment model. Under the high gravity field provided by the centrifugal machine, the industrial camera photographs the deformation process of the reinforced embankment model, and the displacement amount of the identification point in the image is analyzed through the image processing system, so that the deformation amount of the reinforced material can be obtained. And the parameters are compared with measurement parameters of a laser displacement meter above the reinforced embankment model and graduated scales pasted on the periphery of an observation window, so that the deformation characteristics of the reinforced material and the overall deformation field of the reinforced embankment model are obtained.

The invention provides a weld joint dynamic eddy current detection method and system based on reinforcement learning, the system comprises a sensing layer, a decision layer, an execution layer and an identification layer, the sensing layer is used for collecting detection data of a weld joint surface, and the sensing layer comprises an eddy current sensor, a laser displacement meter and a thermal infrared imager; the decision-making layer is connected with the sensing layer and is used for dynamically adjusting detection parameters based on a reinforcement learning algorithm; the execution layer is connected with the decision layer, is used for executing a detection action according to the adjusted detection parameters, and comprises a four-axis linkage eddy current sensor and a frequency converter; the identification layer is connected with the sensing layer and the decision-making layer, is used for identifying weld defects based on the eddy current signals, and comprises a multi-defect identification model; and the decision layer dynamically adjusts detection parameters of the execution layer through a reinforcement learning algorithm by taking the time-frequency characteristic of the eddy current signal, the lift-off gap and the environment temperature as a state space and taking the frequency adjustment amount and the lift-off gap control instruction as an action space, so that real-time detection of the apparent defects of the welding seam is realized.

The invention relates to a method, a device, equipment and a medium for measuring the size and the warping degree of a ceramic substrate for heat dissipation of a high-power power electronic module, and the method comprises the following steps: S1, placing the ceramic substrate on a horizontal plane, scanning the surface of the ceramic substrate through a 3D line laser measuring instrument, and obtaining a height image of the surface of the ceramic substrate; s2, dividing the height image into a ceramic substrate area and a background horizontal plane area; s3, the width and height of the ceramic substrate are calculated after the ceramic substrate area is rotated and straightened; and S4, according to the height image, measuring the position of the highest point of the ceramic substrate, the height value of the highest point and the height value of the horizontal plane of the background horizontal plane area, and measuring the thickness value of the highest point of the ceramic substrate by using a correlation laser displacement meter. And calculating the warping degree of the ceramic substrate according to the height value and the thickness value of the highest point of the ceramic substrate and the height value of the horizontal plane. The warping degree, the size and the thickness of the ceramic substrate can be accurately measured, and the product performance is guaranteed.

The present invention relates to the field of sound barrier detection technology, specifically a method and system for rapid detection of the detachment of a highway sound barrier screen, comprising the following steps: S1. The detection vehicle travels at a constant speed, starts and calibrates the laser displacement meter module, and obtains a correction value; S2. Continuously measures the distance between the sound barrier and the vehicle, and constructs a distance information model; S3. Preprocesses and identifies abnormalities in the data, and determines abnormal conditions of the sound barrier; S4. If the detachment or displacement of the sound barrier screen is detected to exceed a preset threshold, the abnormal information and its position are recorded; S5. Automatically analyzes the detection data and generates a sound barrier detection report. The advantages of the present invention are: efficient and automated detection of the service status of the sound barrier screen is achieved, and formatted data is effectively accumulated, providing a corresponding data basis for the detection, maintenance, and management of road and bridge sound barriers, and providing a strong guarantee for the safe maintenance of transportation infrastructure.

To provide a metal-clad laminate or the like which can reduce variation in the amount of warpage of a semiconductor package and has a small variation in the rate of dimensional change. The metal-clad laminate is a metal-clad laminate including a metal foil and a cured product of one or more plies of a prepreg, in which an average thickness measured according to the following method using a laser displacement meter is 400 µm or more, and a value calculated from the following formula (1) is 0.70% or less: (average value of standard deviation of thickness obtained by the following method) × 100 / (average thickness of metal-clad laminate) (Method for measuring thickness of metal-clad laminate) The thickness is measured by cutting out four measurement substrates each having a size of 60 mm (vertical) × 60 mm (horizontal) in a plane direction from an arbitrary portion of the metal-clad laminate. Measurements are carried out at intervals of 1 mm on two diagonal lines, with the starting point and the ending point of the measurement not located at the ends of the metal-clad laminate. For each of the four measurement substrates, a standard deviation is obtained from the measured thicknesses at all the points, and then an average value of the standard deviations of the thicknesses of each of the four measurement substrates is obtained. Further, the average thickness of all the points measured for the four measurement substrates is calculated, and this is taken as the average thickness of the metal-clad laminate. Details are as described in the description herein.

The invention relates to the technical field of road detection, and provides a device and method for collecting pavement internal deformation characteristics in a road model experiment, and the device comprises a transparent visible gel layer which is used as a road surface layer simulation material and is flatly laid above a roadbed simulation material in the horizontal direction; the plurality of three-dimensional tracing particles are arranged in the transparent visible gel layer and are distributed in a staggered manner in a three-dimensional space, each three-dimensional tracing particle comprises a cylinder extending in the vertical direction, and cross-shaped tracing plates are arranged on the upper surface and the lower surface of each cylinder; wherein the three-dimensional tracer particles cooperatively deform along with the transparent visible gel layer in the deformation process of the roadbed simulation material, and are used for acquiring three-dimensional displacement and rotation information through an image recognition device, so that three-dimensional visualization of road internal deformation characteristics is realized. Limitation of a traditional laser displacement meter is broken through, and whole-process monitoring of road transverse deformation is achieved.

A wind power foundation saturation container multi-dimensional loading device comprises a vertical moving part, a plane rotating part, a model box part and a saturation part, the vertical moving part is used for being connected with and driving the plane rotating part to move vertically, the plane rotating part is used for driving a loading tower to move horizontally, an adjustable supporting leg is arranged on the loading tower, and a winch motor is arranged on the adjustable supporting leg and connected with a winch. The model box part comprises a foundation material arranged in a model box body, tracer particles doped in the foundation material, a model structure arranged in the foundation material, an inclinometer and a loading ring arranged on the top surface of the model structure, a cable connected between the loading ring and the hook, a dynamometer arranged on the cable, and a laser displacement meter arranged on the inner wall of the model box body; the saturation part comprises a static sounding support arranged on the inner wall of the model box body, a clamp is arranged on the static sounding support, a liftable static sounding probe rod is arranged in the clamp, a water injection hole and a water drainage hole are formed in the side wall of the model box body, and a camera is erected right in front of the model box body.

A tunnel longitudinal and transverse full-section deformation monitoring device in a model experiment comprises a model box, a horizontal positioning support, a vertical adjustable positioning support, a longitudinal transmission mechanism, a displacement meter rotating mechanism, a speed controller and a data processing module, and an electric push rod of the longitudinal transmission mechanism controls a laser displacement meter of the displacement meter rotating mechanism to translate along the axis of a tunnel. A hollow shaft stepping motor of a displacement meter rotating mechanism is used for controlling a laser displacement meter to rotate in the circumferential direction of a tunnel, the laser displacement meter covers measurement of any point on the inner side of the tunnel, and therefore all tunnel deformation response data are obtained, intelligent data noise reduction filtering processing is conducted on the basis of a novel unsupervised generative adversarial network (GAN) model architecture, and the tunnel deformation response accuracy is improved. And the data quality and the deformation mode capturing capability are improved. The method is suitable for exploring the longitudinal and transverse global deformation conditions of the tunnel structure under various disturbance effects, can be flexibly adjusted according to the burial depth, size, horizontal position, monitoring density and the like of the tunnel required by the test, and has wide applicability.

The invention relates to the technical field of sound barrier detection, in particular to a method and system for rapidly detecting falling of a road sound barrier screen body, and the method comprises the following steps: S1, enabling a detection vehicle to run at a constant speed, starting and calibrating a laser displacement meter module, and obtaining a correction value; s2, continuously measuring the distance between the sound barrier and the vehicle, and constructing a distance information model; s3, carrying out data preprocessing and abnormity identification, and judging the abnormal condition of the sound barrier; s4, if it is detected that falling or deviation of the sound barrier body exceeds a preset threshold value, abnormal information and the position of the abnormal information are recorded; and S5, automatically analyzing the detection data and generating a sound barrier detection report. The method has the advantages that efficient and automatic detection of the service condition of the sound barrier screen body is achieved, formatted data are effectively accumulated, corresponding data bases are provided for detection, maintenance and management work of road and bridge sound barriers, and powerful guarantee is provided for safety maintenance of traffic infrastructures.

To provide a metal-clad laminate or the like which can reduce variation in the amount of warpage of a semiconductor package and has a small variation in the rate of dimensional change. Specifically, the metal-clad laminate is a metal-clad laminate including a metal foil and a cured product of one or more plies of a prepreg, in which an average thickness measured according to the following method using a laser displacement meter is 400 µm or more, and an average value of absolute values of differences between a maximum value and a minimum value of thicknesses is 20 µm or less. (Method for measuring thickness of metal-clad laminate) The thickness is measured by cutting out four measurement substrates each having a size of 60 mm (vertical) × 60 mm (horizontal) in a plane direction from an arbitrary portion of the metal-clad laminate. The measurement is performed at intervals of 1 mm in the vertical direction from a start point of less than 1 mm (however, not 0 mm) from the upper side; the measurement of the vertical line is performed for 12 lines; the first line is located 2.5 mm away from the left side, and measurement lines are provided at intervals of 5 mm thereafter; further, the thickness is measured at intervals of 1 mm in the horizontal direction from a start point of less than 1 mm (however, not 0 mm) from the left side; the measurement of the horizontal line is also performed for 12 lines; the first line is located 2.5 mm away from the upper side, and measurement lines are provided at intervals of 5 mm thereafter; details are as described in the description herein.

The invention is suitable for the technical field of civil engineering, and relates to a displacement monitoring system and a data correction method in a surrounding rock temperature changing process, and the system comprises a fixed disc, a laser displacement meter, a connecting piece, a pedestal, a track, and a driving piece. The rail is connected with the driving piece, the base is installed on the rail, the base is provided with a connecting piece, the connecting piece is connected with the fixed disc, and the fixed disc is provided with a plurality of laser displacement meters used for collecting tunnel data. The tunnel structure deformation monitoring device is simple in structure, convenient to disassemble, flexible in positioning, capable of achieving real-time, long-term, accurate and stable tunnel structure deformation monitoring and high in feasibility, economical efficiency and generalization performance.

The utility model discloses a monitoring device for vertical displacement of a main beam during replacement of a beam type bridge support, and solves the problem that the traditional vertical displacement monitoring equipment such as a dial indicator, a pull rope type displacement meter, a laser displacement meter and a steel ruler is low in measurement accuracy and precision due to the fact that the traditional vertical displacement monitoring equipment is not placed vertically or the resolution ratio of a measuring tool is insufficient. The vertical displacement monitoring point is arranged on the side face of the pier cap or the abutment cap, and the depth vernier caliper is used for measuring the distance between the vertical displacement monitoring point and the bottom of the main beam, so that the monitoring precision and accuracy of the vertical displacement of the main beam are improved to a great extent, and the deviation of field sensor installation and alignment is eliminated; and the process of measuring the vertical displacement change of the main beam on site is simplified. And meanwhile, compared with the conventional measurement that a monitoring point is exposed to the outside, the monitoring point is transformed on the premise that the monitoring point is greatly damaged by man-made or environment. The method and the device have good economic practicability, are convenient to operate and are suitable for large-scale popularization and application.

The invention provides a method for measuring the damping per unit length of an inhaul cable, and belongs to the technical field of inhaul cable damping measurement, and the method comprises the steps: measuring the mass per unit length of the inhaul cable, and arranging a laser displacement meter in the vibration direction of the inhaul cable; initial displacement is applied to the inhaul cable and released, and the inhaul cable is excited to vibrate; measuring a vibration displacement time-history curve, a speed time-history curve or an acceleration time-history curve in any point surface of the inhaul cable in the vibration state through a laser displacement meter, and carrying out filtering processing on the vibration displacement time-history curve, the speed time-history curve or the acceleration time-history curve; extracting peak values of the displacement time-history curve, the speed time-history curve or the acceleration time-history curve after filtering processing and moments corresponding to the peak values; and based on the peak value of the displacement time travel curve, the speed time travel curve or the acceleration time travel curve after filtering processing, the moment corresponding to the peak value and the mass per unit length of the inhaul cable, obtaining the damping per unit length of the inhaul cable.

To improve workability for measuring warpage of a measuring surface.SOLUTION: A warpage measuring apparatus 1 comprises: a horizontal direction warpage measurement unit 2 including joint support pins 22, 23 with prescribed projection dimension near both ends of a horizontal long-sized material 21 in a longer direction and a first laser displacement meter 24 on an intermediate part in the longer direction; and a vertical direction warpage measurement unit 3 including laser displacement meters 32, 33 near both ends of a vertical long-sized material 31 in a longer direction. Distance to a joint bottom is measured by the laser displacement meters 24, 32, 33 while joint support pins 22, 23 are brought into contact with a joint bottom of an outer wall as reference joint. Warpage of the outer wall in a horizontal direction is measured by projection dimension of the joint support pins 22, 23 and measurement result of the first laser displacement meter 24, and warpage of the outer wall in a vertical direction is measured by an average value of distances to the outer wall respectively measured by the laser displacement meters 32, 33 and distance to the outer wall measured by the first laser displacement meter 24.SELECTED DRAWING: Figure 1

A protective device and method for a continuous wind tunnel flutter test model, belonging to the field of wind tunnel testing technology, addresses the problem that traditional physical methods cannot measure the deformation of special structural models during flutter tests. The device includes a reflector and a laser displacement meter matrix, which are respectively positioned opposite each other on the two sidewalls of the wind tunnel test section. One end of the test model is connected to one sidewall, and the free end of the test model extends horizontally towards the other sidewall. The amplitude at a specified position on the test model is calculated using the laser displacement meter matrix, and this is used as the criterion for the activation of the safety protection device. Once the calculated result exceeds the safe range, the safety protection device can be quickly activated to protect the test model and stop the wind tunnel test. This device and method overcome the shortcomings of using other types of sensors for safety threshold judgment in continuous transonic wind tunnel flutter tests, avoiding damage to the wind tunnel and test model during flutter tests.

The invention provides a three-dimensional high-speed vibration target clear image acquisition method and system and a medium, and the method comprises the steps: collecting a vibration target image based on a high-speed camera, carrying out the preprocessing of the vibration target image, and extracting a target contour; analyzing a target center point based on the target contour, and measuring three-dimensional position information of the target center point at different time nodes based on a laser displacement meter; analyzing plane vibration information and depth vibration information of the target based on the three-dimensional position information of the target center point at different time nodes; performing fusion processing on the plane vibration information and the depth vibration information to generate three-dimensional vibration state information of the target; adjusting a visual angle and a focal length of the high-speed camera based on the three-dimensional vibration state information of the target to obtain a clear image of the target; through dynamic zooming and angle adjustment of the high-speed camera, high-speed vibration tracking can be carried out on a complex-shape target under high magnification, and a clear image is obtained.