229results about "Elasticity measurement" patented technology

The application discloses a tunnel lining thermal-mechanical coupling damage identification and positioning method and system based on a distributed optical fiber, the application is characterized in that a distributed optical fiber network is arranged along the circumferential direction and the longitudinal direction at the inner surface of the lining and the key positions between layers, and the full-distributed temperature and strain data are acquired in combination with a demodulator; the core of the application is a built-in decoupling algorithm of a deep residual network (ResNet) based on a sparrow search algorithm (SSA) optimization; the algorithm introduces residual connection, a LeakyReLU activation function and a SSA global optimization strategy to construct a high-precision nonlinear mapping model in view of the cross-sensitivity problem; the application can accurately remove the non-damage deformation caused by temperature, and restore the real mechanical strain with high fidelity, so that the early identification of the stress concentration area and the micro crack is realized; meanwhile, the thermal expansion and cold contraction and the structural actual damage are effectively distinguished, the defects of the limited monitoring range and the easy misjudgment of the traditional monitoring method are overcome, and the accurate damage positioning and reliable monitoring of the full scale of the tunnel are realized.

This invention discloses a method for calculating the deformation of a cross-water bridge based on BeiDou-3 / GNSS inversion, specifically relating to the field of bridge monitoring technology. The steps are as follows: Based on the satellites observable by the bridge structure monitoring station, an observation equation is established by combining all satellites; the observation equation is solved using the matrix method to obtain the predicted state vector and the covariance matrix of the state vector of the bridge structure deformation; considering the influence of gross errors in BeiDou-3 / GNSS observations, an adaptive factor is proposed to correct the predicted value of the state vector; the vector K and the updated state vector covariance are obtained; considering that there are still gross errors in the BeiDou-3 / GNSS carrier phase observations, a robust factor M is introduced to determine the weight of each type of observation; the K matrix and the state covariance matrix are updated using the corrected measurement covariance matrix R; the updated state vector is calculated. This invention solves the problem of low accuracy in conventional BeiDou / GNSS data processing methods, improving the accuracy of bridge deformation calculation.

This invention discloses a method and apparatus for accurate bridge damage identification and location based on multi-source data fusion. The method includes: performing spatiotemporal registration and data fusion on the time-series data of the bridge's global planar deformation obtained by ground-based synthetic aperture radar and the time-series data of the bridge's point-like three-dimensional deformation obtained by the BeiDou satellite navigation system to obtain a fused deformation field of the entire bridge area; calculating multiple damage characteristic indicators reflecting different deformation physical mechanisms of the bridge based on the fused deformation field, and determining the corresponding preliminary damage level based on the damage judgment threshold of each damage characteristic indicator; using the preliminary damage levels of each damage characteristic indicator as independent evidence sources, performing evidence fusion to resolve indicator conflicts, and determining the bridge damage location and damage level based on the fusion result. This method can effectively improve the accuracy and reliability of bridge damage identification and location, providing a scientific basis for bridge operation and maintenance decisions.

A fibre-reinforced polymer composite component 2 formed from a polymer matrix material containing fibre reinforcement. The component 2 comprises a main portion 4 and at least one raised feature 6 extending from a surface plane s of said main portion 4. The at least one raised feature 6 is arranged to incur visually perceptible damage when the component 2 is subject to an impact with an energy above a predetermined impact energy threshold and to resist an impact with an energy below the predetermined impact energy threshold.

A system 20 for monitoring a tubular structure 22 having a length, comprising: a sensor module array 32 having a plurality of sensor modules 34 configured to sense one or more parameters relating to 2

The utility model discloses bridge bearing capacity nondestructive testing device belongs to bridge bearing capacity detection technical field, and its technical key points include clamping subassembly, exciter subassembly, limiting component and hoist subassembly. The utility model, when the bearing capacity of bridge is detected, in order to avoid damaging bridge during detection, therefore can first place the piece and connect on bridge guardrail, at this time through hoist subassembly can move installation spare to bridge side end, and through the clamping of two clamping plates, can make installation spare can stably set up in bridge side end, at this time through limiting component can be fixed to the position of two clamping plates, thereby avoid installation spare to fall off, after can through single heavy vehicle and travel at different speeds and inspire bridge vibration, and through exciter subassembly vibration data collection, detection, thereby can detect the bearing capacity of bridge.

This invention relates to the field of disc spring testing technology, and provides a disc spring testing device and method, comprising a frame; a pressure platform mounted on the frame for placing the disc spring to be tested; a pressure member mounted on the frame, positioned above the pressure platform, for applying axial pressure to the disc spring, the pressure member having a mounting groove with an opening facing the pressure platform; and an inner support mechanism disposed within the mounting groove, extending beyond the pressure member, capable of penetrating the inner hole of the disc spring under the influence of the pressure member, for centering support within the inner hole of the disc spring. This invention achieves coaxial positioning of the disc spring and the pressure member through the coaxial arrangement of the inner support mechanism and the centering support of the inner support member on the disc spring, solving the technical problem of positioning deviation of the positioning cylinder due to wear after long-term use in the prior art where the positioning cylinder is used to position the spring.

The application provides an aero-engine whole machine fulcrum stiffness test device, method and test design method, and the test device comprises a whole machine fulcrum loading test tool, and the whole machine fulcrum loading test tool comprises a constraint tool, a fulcrum displacement measuring device and a fulcrum loading tool; the constraint tool is used for fixing a test aero-engine and comprises a fixing assembly and a hoisting device; the fixing assembly is arranged around the test aero-engine, and the hoisting device is connected and fixed to the test aero-engine; the fulcrum displacement measuring device comprises a support frame and a supporting connection structure, the supporting connection structure is arranged through the inside of the test aero-engine, and the supporting connection structure provides a plurality of force applying fulcrums for the test aero-engine; the support frame is used for supporting the supporting connection structure; the fulcrum loading tool is arranged on one side of the test aero-engine in the axial direction, the fulcrum loading tool extends into and is connected to the inside of the supporting connection structure along the axial direction of the supporting connection structure, and the fulcrum loading tool is used for applying a radial force to the supporting connection structure.

The application discloses a variable stiffness restraint test fixture and a test method for soft package lithium ion batteries, aiming to solve the technical problem that the existing battery mechanical test equipment is difficult to quantitatively and independently adjust the equivalent stiffness of the system. The fixture comprises a loading mechanism, a restraint module, a replaceable linear spring group and a sensor module. The operator accurately applies the initial pre-tightening force by adjusting the loading mechanism, and in the battery charging and discharging cycle, the linear spring group provides a clear and quantifiable equivalent restraint stiffness. The test method based on the fixture comprises the following steps in sequence: battery installation, stiffness configuration, pre-tightening force application, and cycle test and data acquisition. The application realizes double independent quantitative control of the pre-tightening force and the restraint stiffness, can provide clear mechanical boundary conditions for the battery mechanical test, and helps to objectively evaluate the influence of mechanical restraint on the battery performance.

A test device and method can include a frame, a force applicator, and a force sensor. The frame includes a first handle, second handle, and main body. The handles extend from a perimeter of the main body and are configured to be gripped by an operator's hands. The main body includes a housing portion and support portion. The housing portion is configured to hold a display device such that a display screen of the display device is visible from a rear side of the main body. The support portion is disposed on a front side of the main body. The force applicator extends forward away from the support portion. The force sensor is mounted to the support portion and couples the force applicator to the support portion. The force sensor is configured to detect a push and / or pull force applied via the force applicator to a location on an object.

The utility model relates to the field of automobile manufacturing, concretely relates to a displacement sensor arrangement device for the body curvature test, the device includes base, T type support and sensor clamp, the base is fixed on the magnetic attraction seat, through the magnetic attraction seat will base fixed adsorption on the iron floor, be provided with a plurality of mounting holes on the base, the bottom of T type support is provided with mounting hole, through the saucer bolt fixed on the base, be provided with a plurality of adjusting rod through -inserted hole on the crosspiece of T type support, the sensor clamp includes horizontal adjusting rod and longitudinal adjusting rod, horizontal adjusting rod and longitudinal adjusting rod are fixed through saucer bolt, horizontal adjusting rod can pass through the through -inserted hole on the crosspiece of T type support and be fixed through saucer bolt, set up displacement sensor clip on the upper portion of longitudinal adjusting rod, the utility model has big adjustment range, and wide application range can satisfy the test to the bending stiffness of light truck cab (including pick-up truck) and frame, car & SUV body in white, light passenger car body in white etc.

The invention relates to a wire strand (100) comprising at least three wires (102, 104), wherein an optical fiber (110) is arranged in a cavity (106) 5 between three adjacent ones of the at least three wires (102, 104), which optical fiber (110) comprises a fiber core and at least one further layer surrounding the fiber core, wherein the diameter (D1) of the largest imaginary circle (108) inscribable in the cross-section of the cavity (106) is smaller than the outer diameter (D2) of the optical fiber (110), wherein the diameter of the 10 fiber core (112) is smaller than the diameter (D1) of said largest imaginary circle (108), and wherein the ratio of the outer diameter (D2) of the optical fiber (110) to the diameter (D3) of that one of the three adjacent wires (102, 104) which has the smallest diameter is at least about 0.15 and at most about 0.18.

This invention discloses a mechanical performance testing device and method for simulating the detachment of a plate rubber bearing. The device includes a loading beam, a support platform, a loading head, a plate rubber bearing, a bearing mounting platform, a hinge assembly, a push-pull mechanism, a horizontal displacement adjustment mechanism, and a control system. The support platform has a bearing mounting platform at its top left end, a plate rubber bearing at its top, a loading head at its top, and a loading beam at its top. The support platform is hinged to the right end of the loading beam. The fixed end of the push-pull mechanism is embedded in the support platform, and its output end is hinged to the bottom of the loading beam. One end of the horizontal displacement adjustment mechanism is horizontally fixed to the support platform, and its other end is detachably connected to the side wall of the bearing mounting platform. The control system is connected to both the push-pull mechanism and the horizontal displacement adjustment mechanism. The device simulates the bearing compression performance under eccentric detachment conditions and the bearing compression and shear performance under displacement detachment conditions in actual bridges.

The application discloses a microcomputer-controlled electro-hydraulic servo bridge expansion device testing machine, which comprises a base, a detection platform and a detection device. The base is provided with transverse sliding rails, longitudinal sliding rails and at least two groups of movable gantries. The detection platform comprises a first platform and a second platform. The first platform is provided with a vertical misalignment cylinder between the first platform and the transverse sliding rails. The second platform is provided with a misalignment turntable rail between the second platform and the longitudinal sliding rails. The detection device comprises transverse detection devices, longitudinal detection devices and vertical detection devices. The transverse detection devices can exert a transverse load on the first platform. At least two longitudinal loading cylinders of the longitudinal detection devices can independently exert a longitudinal load on the second platform. A plurality of vertical loading cylinders of the vertical detection devices can independently exert a vertical load on different parts of the bridge expansion device. The application can simulate longitudinal inclination, vertical inclination, transverse misalignment and multi-directional composite deformation conditions, and comprehensively detect the sealing performance, fatigue life and structural reliability of the bridge expansion device.

The application discloses a bridge structure stability intelligent detection method and system based on DAS, and relates to the technical field of bridge health monitoring. A distributed optical fiber sensing device is used to obtain vibration signals at multiple positions of a bridge, a multi-channel vibration data matrix is established after denoising processing of the vibration signals, a random subspace identification method is used for modal analysis, and real-time modal parameters of the bridge structure are obtained. According to the reference modal parameters, modal characteristic data is calculated and input into a pre-trained detection model to obtain a bridge state detection result. The application uses DAS to realize multi-point high-density monitoring, improves analysis accuracy by combining denoising and modal recognition technology, realizes automatic and intelligent detection of the bridge structure stability through an intelligent model, reduces manual intervention, and improves monitoring efficiency.

A method for synchronous excitation of multiple exciters relates to the field of dynamic testing and vibration control technology for large civil structures. The method includes the following steps: after constructing a unified time reference based on satellite navigation signals and a rubidium atomic clock, excitation amplitude and phase parameters are obtained based on the target modal requirements, and these parameters are sent to all exciter slave stations; the exciter slave stations generate a reference trajectory based on the excitation amplitude and phase parameters, enabling the exciter motor shaft angle to follow the reference trajectory in real time and output the target excitation; the phase error is obtained based on the measured excitation phase value and the reference trajectory, and then the motor angular velocity of the exciter is corrected based on the phase error. This invention solves the problems of startup phase error and long-term frequency drift in master-slave triggering schemes, ensuring synchronous start-up of all exciters. Combined with dynamic correction of the exciter motor angular velocity, it suppresses phase drift during long-term operation, significantly improving the excitation efficiency of higher-order modes and the clarity of the response signal.

The application discloses a bridge full life cycle management and maintenance system based on digital twinning, which is used for the full life cycle management and maintenance of a cable-stayed bridge and comprises a data acquisition and fusion module, a digital twinning model construction and dynamic updating module and a structure health assessment and prediction module.The data acquisition and fusion module is used for acquiring monitoring data of the cable-stayed bridge in real time and fusing and processing multi-source data by using an adaptive weighting method.The digital twinning model construction and dynamic updating module is used for constructing and continuously calibrating a parameterized finite element simulation model based on bridge design parameters and fused data output by the data acquisition and fusion module, so as to serve as a digital twinning model corresponding to the physical bridge, and the digital twinning model can simulate material performance degradation.The structure health assessment and prediction module is used for assessing the current health state of bridge components by using residual characteristics of digital twinning model output and measured data based on the updated digital twinning model output by the digital twinning model construction and dynamic updating module.The application realizes intelligent management and maintenance of the full life cycle of the cable-stayed bridge.

A system for forecasting deterioration of infrastructure assets comprises one or more processors and a memory storing instructions that cause the system to perform: preprocessing characteristic data from a first database and conditioning data from a second database for a list of infrastructure assets, selecting features affecting deterioration of elements of the list of infrastructure assets based on the characteristic data and the conditioning data, developing machine learning models to predict a health index of each element of the list of infrastructure assets, based on the selected features, identifying a list of decision variables to predict maintenance interventions for the elements based on predicted health indexes and maintenance data from a third database, formulating an objective function based on the maintenance data and the identified list of decision variables, and outputting maintenance intervention plans that optimize performance of the list of infrastructure assets and comply with the maintenance data.

The utility model discloses a kind of electronic cigarette silica gel sealing ring elasticity tester, the tester includes tensile drive mechanism, tensile fixture and temperature simulation mechanism.Tensile drive mechanism is moved by screw rod rotation to drive movable beam, and then realize the tensile operation to silica gel sealing ring, and tensile force sensor can record tensile force data during movable beam movement.Tensile fixture is used to firmly hold silica gel sealing ring, to ensure the accuracy of tensile test.Temperature simulation mechanism can generate hot air and blow to the silica gel sealing ring being stretched, simulate different temperature environment.Through the tester, electronic cigarette silica gel sealing ring can be carried out elasticity test under the temperature condition set, comprehensively assess its elasticity performance under different temperatures, provide reliable basis for the research and development, production and quality control of electronic cigarette sealing ring.

The technology disclosed relates to a wind turbine and a measurement system comprising at least three measurement units, each arranged in substantially the same horizontal plane of a wind turbine tower and configured to measure their respective movements, and at least one tilt sensor or vertically oriented geophone arranged in substantially the same horizontal plane as the at least three measurement units and configured to determine the current tilt or inclination of a horizontal plane section determined by the mounting positions of the at least three measurement units. In particular, the measurement system comprising the at least three measurement units and the at least one tilt sensor or vertically oriented geophone is configured to continuously determine the current position and inclination of a horizontal plane section essentially determined by the mounting positions of the at least three measurement units based on the movement measurement data obtained by the at least three measurement units and the inclination of the horizontal plane section obtained by the at least one tilt sensor or vertically oriented geophone.

The application discloses a kind of mine water spraying vehicle water tank performance verification method and device, it is related to mine vehicle tank testing technical field;The method is connected by real vehicle hinge point in the connecting frame with bottom plate with guide roller, using horizontal force simulation acceleration and deceleration impact, multiple point adjustable vertical force simulation road bumping, can be loaded alone or compound, according to actual load spectrum complete strength, rigidity and baffle arrangement rationality verification.Device includes water tank, connecting frame, bottom plate, horizontal and vertical loading mechanism, connecting frame can move along horizontal direction, vertical loading point quantity, position, force value can be adjusted.The present application can truly reproduce mine area harsh working conditions in laboratory, solve the existing problem that only rely on simulation cannot be verified in entity, test accurate, strong universality, fill the method blank of mine water tank performance verification, suitable for all kinds of mine water spraying vehicle water tank and liquid tank body reliability test.

This invention provides a method for detecting and optimizing spring operating mechanisms, as well as related devices. [Solution] The method includes: collecting important data of a spring operating mechanism in real time using stress sensors, velocity sensors, and vibration sensors; constructing a multidimensional data framework and obtaining a multidimensional dataset based on the collected important data; extracting failure features and performing data analysis from the obtained multidimensional dataset, constructing a self-adaptive failure model based on the extracted failure features, then obtaining real-time failure detection results by multimodal data fusion; and optimizing the stress sensors, velocity sensors, and vibration sensors using automatic calibration and optimization of reinforcement learning based on the real-time failure detection results.

This invention discloses an indirect testing method for bridge displacement response under moving loads based on a deep operator physical information neural network, belonging to the field of bridge inspection technology, and includes: 1. acquiring vehicle acceleration response and bridge displacement response under different bridge conditions to construct a dataset; 2. constructing a deep operator network and training the deep operator network using the dataset to obtain a trained displacement prediction model for a simply supported beam under moving loads. This invention learns the mapping relationship between vehicle acceleration response and bridge displacement response under moving loads through a deep operator physical information neural network, thereby indirectly testing the bridge displacement response through vehicle acceleration response. This allows for bridge displacement testing without installing sensors on the bridge, and is used for bridge damage detection.

This invention discloses a movable reaction wall for hybrid simulation testing, belonging to the field of hybrid simulation testing technology. It includes: multiple support columns arranged in an array, with the first end of each support column fixedly connected to an embedded part in the ground of the vibration table; multiple connectors disposed between adjacent support columns and spaced apart along the height direction of the support columns; and actuator supports, adjustable in height and disposed on the outer sides of adjacent support columns. During the simulation test, the actuator supports are connected to the hybrid simulation test actuator. This invention can be used for hybrid simulation testing and is easy to disassemble, assemble, and store, facilitating material reuse and avoiding resource waste.

This utility model discloses an elastic force testing device for processing shock-absorbing springs, relating to the field of shock-absorbing spring elastic force testing technology. It includes a housing and a spring body. A scale strip is provided on the inner rear end of the housing. A first motor is fixedly installed on the upper end of the housing. A lead screw is fixedly connected to the output end of the first motor. A lifting plate is threaded to the outer side of the lead screw. A gravity block is provided below the lifting plate. Two pointers are fixedly connected to the rear end of the gravity block. The elastic force testing device for processing shock-absorbing springs described in this utility model uses a cylinder to drive the lifting plate upwards. Through the linkage between the rotating seat and the pull rod, a V-shaped clamp can adaptively clamp springs of different inner diameters. Furthermore, the anti-slip texture on the outer side of the V-shaped clamp significantly enhances friction, effectively solving the problem of test data fluctuations caused by unstable fixing in traditional devices, and greatly improving test accuracy.

This invention discloses a fiber Bragg grating monitoring method for evaluating the prestress state of bridges, comprising the following steps: S1, constructing a simulation model of the bridge components; S2, arranging fiber Bragg grating sensors at preset positions; S3, collecting the center wavelength of each sensor in a static state; S4, performing prestressing tensioning in stages according to preset intervals, collecting fiber Bragg grating wavelength data after each stage of tensioning, calculating the purely mechanical strain caused by prestressing, comparing it with the theoretical strain value, and determining whether to continue tensioning based on the judgment result; S5, after construction is completed, locking the final strain state that has passed verification as the benchmark data, and storing the benchmark data and the measured data in a database. This invention incorporates finite element simulation data into the construction process, and through real-time comparison of measured values ​​with theoretical values, it can promptly detect potential problems such as excessive prestress loss or abnormal duct friction, thus avoiding the generation of unqualified components.