245 results about "Strain measurement" patented technology

The invention discloses a corrugated steel web bridge deformation monitoring temperature lag compensation method and system, and the method comprises the steps: constructing time sequence data of a corrugated steel web, the time sequence data comprises a time sequence composed of a wave crest temperature, a wave trough temperature, a strain measurement value, a wind speed and solar radiation intensity in any fold period of the corrugated steel web at any moment; according to the time sequence data, calculating the temperature lag time of the temperature to the structure response by using a sliding cross correlation coefficient algorithm of the frequency domain energy weight; time sequence data are reconstructed according to the temperature lag time, and the reconstructed time sequence data are obtained to serve as state vectors of the corrugated steel web; the state vector of the corrugated steel web is input into the strategy network of reinforcement learning, an optimal action instruction of the next step is output and obtained, and the optimal action instruction comprises the step that a compensation signal is applied to time sequence data; according to the optimal action instruction, the predicted state vector of the corrugated steel web at the next moment is obtained; and obtaining a strain prediction value of the corrugated steel web according to the state vector of the corrugated steel web at the next moment. Dynamic and high-precision compensation of the corrugated web bridge temperature hysteresis effect is achieved for the first time.

The invention provides a surgical robot tail end three-dimensional force sensing mechanism and a force measurement method, and relates to the technical field of force measurement, and the surgical robot tail end three-dimensional force sensing mechanism comprises a first connecting end used for connecting a surgical instrument, a second connecting end used for connecting a surgical robot mechanical arm, and a first strain measurement unit arranged between the first connecting end and the second connecting end. The first strain measurement unit comprises a strain structure and a measurement assembly, the strain structure is provided with a first strain part, a second strain part and a third strain part, and the three strain parts are elastically deformed under acting force in a first direction, a second direction and a third direction which are perpendicular to one another; a first strain assembly, a second strain assembly and a third strain assembly of the measuring assembly are correspondingly installed on three strain parts, and the three components are matched to measure acting force borne by the surgical instrument in the first direction, the second direction and the third direction. The measurement limitation of a one-dimensional sensor is broken through, and the measurement of the acting force borne by the surgical instrument in three dimensions is realized.

The invention relates to a fiber bragg grating strain sensor and a preparation method thereof. The method comprises the following steps: providing a metal substrate of which the surface is provided with a strain groove for accommodating a fiber bragg grating; placing a fiber bragg grating in the strain groove, and applying pre-strain to the fiber bragg grating; covering a packaging material on the strain groove area provided with the fiber bragg grating, wherein the packaging material comprises a mixture of metal powder and glass powder; and sintering the substrate covered with the packaging material to melt the glass powder and bond and solidify the metal powder to form a composite packaging body for packaging and fixing the fiber grating in the strain groove. According to the invention, the interface thermal stress caused by the difference of thermal expansion coefficients of materials is reduced, the temperature cross sensitivity of the sensor is effectively inhibited, and the strain measurement precision and long-term stability of the sensor in a wide temperature range are improved.

The invention relates to the technical field of ocean engineering construction automation, and discloses a hinge sinking mattress construction real-time monitoring control system based on multi-sensor fusion, which inverts a near-field hydrodynamic environment acting on a hinge sinking mattress through a hydrodynamic field inversion module by using strain measurement data and a parameterized forward dynamical model, and performs real-time monitoring and control on the hinge sinking mattress. The state fusion estimation module fuses sparse absolute position measurement data and high-density form measurement data in an extended Kalman filtering framework, introduces form manifold projection correction, and accurately estimates the position, attitude and form of the sinking mattress. And the predictive control decision module takes the estimated system state and the inverted near-field hydrodynamic environment as input, and solves an optimization problem to generate an optimal control sequence under multiple constraints of considering structural safety and physical limitation of an execution mechanism. According to the method, active suppression of hydrodynamic disturbance is achieved, the robustness and precision of state estimation are improved, and the automation level and efficiency of hinge sinking construction are remarkably improved.

The invention discloses a high-precision bridge structure global strain measurement method and system, and relates to the technical field of civil engineering-structure health monitoring. The system comprises a video acquisition module which is deployed at a stable observation point of a bridge and acquires a standard frame rate video; the pixel domain preprocessing module constructs a space-time matrix and generates a weight matrix and a shielding mask; the multi-scale spatial adjacency graph module divides nodes according to first-level component-second-level segmentation-superpixel clustering, defines an edge weight and applies geometric prior constraints; the variation displacement solving module obtains a displacement field through a multi-constraint objective function and ADMM iteration; the adaptive baseline strain calculation module dynamically selects the baseline length and calculates the strain; the abnormal point processing module ensures data integrity through a discrimination-elimination-re-estimation process; and the cross-section synchronous constraint module reduces displacement deviation. The method solves the problems of large traditional calibration error, local measurement limitation and environmental interference, and guarantees the reliability of bridge health monitoring data.

The invention discloses a non-contact uniaxial compression test infrared strain meter and a use method thereof, and belongs to the field of rock mechanics and engineering testing. The objective of the invention is to solve the prominent problems of low measurement precision, easy influence by characteristics of a test object, difficulty in comprehensively and accurately reflecting full-field strain distribution and the like of a traditional contact type strain measurement device in a uniaxial compression test. A non-contact infrared imaging measurement technology is adopted, a high-speed infrared camera is matched with a DIC algorithm, real-time mapping of full-field strain distribution is accurately achieved, transient behaviors such as crack initiation and expansion are clearly captured, strain field data and temperature field data can be synchronously obtained, measurement of the strain field data and the temperature field data are organically combined, and by means of the infrared technology and an environment control device, the measurement accuracy is improved. The device can stably work in severe environments such as high temperature and corrosivity, and is suitable for various complex samples; according to the method, the accuracy and comprehensiveness of measurement are effectively improved, the test efficiency is greatly improved, the method can be widely expanded to multiple fields of civil engineering, aerospace and the like, and powerful support is provided for research on mechanical properties of materials.

The invention discloses a method for testing compression creep performance of a metal material under a constant-temperature condition, relates to the technical field of high-temperature performance testing of metal materials, and aims to solve the problem of inaccurate creep measurement at a constant temperature. According to the invention, a full-process compression creep performance test method of constant temperature control, loading compensation and strain correction is constructed, the test accuracy and the result consistency of the metal material in a constant temperature environment are improved, closed-loop control is realized through actual measurement temperature, time delay prediction and retaining ring heating are introduced, the constant temperature stability is ensured, and the test accuracy is improved. A micro-stepping compensation mechanism is adopted to maintain constant pressure stress, a loading state is automatically recovered after interruption, then system deformation is deducted through main and auxiliary link cooperation and a compliance template, strain measurement precision is ensured, distortion caused by boundary friction is overcome in combination with end face stick-slip detection and equivalent strain correction, and the accuracy of strain measurement is improved. Finally, automatic output of performance parameters is achieved through steady-state segment extraction and anomaly recognition, and the effectiveness, reproducibility and engineering applicability of test data are guaranteed.

The invention relates to the technical field of strain measurement, in particular to a three-dimensional full-field strain measurement method and system based on multi-view collaboration, and the method comprises the steps: constructing a sparse topology skeleton model of a measured target under a global coordinate system, and building a bidirectional projection mapping relation between the global situation and each local situation; the method comprises the following steps: synchronously acquiring a time sequence texture feature image of a measured target, calculating a luminosity geometric coupling confidence tensor of each pixel point and extracting an initial texture feature field under each view angle; utilizing a skeleton model to guide the initial texture feature field to perform limited local matching, and resolving to obtain a local independent displacement field and residual energy distribution of each view angle; performing multi-view weighted fusion based on a bidirectional projection mapping relation, and reconstructing a global three-dimensional displacement field; and performing differential calculation on the global three-dimensional displacement field to obtain a deformation gradient tensor and generate three-dimensional full-field strain distribution. According to the method, gradient mutation caused by view field splicing errors can be effectively inhibited, and physically real and full-field continuous three-dimensional strain distribution is obtained.

This invention relates to the field of force sensor technology, and more particularly to a pressure-balanced underwater six-dimensional force sensor sealing structure and method. It primarily addresses the problems of insufficient sealing pressure resistance and susceptibility to seawater leakage when existing six-dimensional force sensors are applied in underwater scenarios, and the fact that high underwater pressure can cause deformation of the main structure, interfering with strain measurement and leading to force signal deviation. The proposed technical solution includes a force sensor body, with a mounting plate installed at the output end of the force sensor body, and an elastic element disposed at and penetrated by the elastic element at the output end of the force sensor body; a sealing element disposed on the side of the force sensor body away from the elastic element, the sealing element being made of rigid or elastic material. The force sensor body, the elastic element, and the sealing element form a sealing structure that encloses the deformable beam and the PCB board. This invention can improve its underwater sealing pressure resistance and anti-interference capability, ensure force measurement accuracy, and assist underwater robots in precise operation.

A method and apparatus for estimating a weight of a vehicle are disclosed. An example apparatus includes at least one processor circuit to obtain strain measurement data from a strain gauge coupled to a surface of a shock tower of a vehicle; estimating a vehicle total weight of the vehicle based on the strain measurement data; and outputting the total weight of the vehicle for presentation through a user interface.

This disclosure provides an experimental apparatus for measuring the migration law of chloride ions in concrete under tensile load. The apparatus includes a base plate, with fixed supports on both the left and right sides of the top of the base plate. Between the two fixed supports are N transparent boxes and N+1 tensioning components. Each transparent box contains a prism-shaped concrete specimen of appropriate size. A resistance strain gauge is mounted on the top of the prism-shaped concrete specimen, and the specimen is communicatively connected to a strain gauge measuring instrument via the strain gauge. A hydraulic hollow jack is located on the left side of the top of the base plate, to the left of the fixed support on the same side. A pressure sensor is connected to the left end of the hydraulic hollow jack, and the pressure sensor is communicatively connected to a load display. A hydraulic loading pump is also connected to the hydraulic hollow jack. A spring baffle is located on the right side of the top of the base plate, to the right of the fixed support on the same side. A return spring is located between the spring baffle and the fixed support on the same side.

This invention relates to the field of tunnel construction technology, specifically to a method, medium, and equipment for judging and correcting abnormal strain signals in tunnel boring machines (TBMs). The method includes the following steps: simulating the mechanical response of the main drive structure under theoretically rated external load conditions; selecting strain measurement point locations based on the simulation results; deploying strain sensors at the selected locations on the actual TBM, and then performing threshold judgment on the strain signals collected by the strain sensors. If the signal of the strain measurement point channel exceeds the threshold, the channel is deemed to be faulty; if the signal of the strain measurement point channel does not exceed the threshold, a secondary judgment is performed using the same channel of its symmetrical measurement points; and a mapping model between equipment operating parameters and strain signals is established based on historical data from the strain measurement point channels. This invention avoids the interruption of operation of the digital twin system due to signal loss, greatly improving the system's continuous operation capability in harsh engineering environments.

This invention pertains to the field of tunnel structure testing technology, specifically a stiffness coordination testing structure and method for actively unloading gravel-reinforced structures. It includes two supports, on which a gabion cage is mounted. Several tension rod assemblies are installed on the gabion cage, each with a strain gauge connected to a static strain gauge. Two I-beams are positioned on the upper surface of the gabion cage. A reaction frame is located on the experimental platform, with jacks positioned between the reaction frame and the I-beams on the upper surface of the two I-beams. A non-contact full-field strain measurement system is also installed on the experimental platform to measure the displacement data of the lower edge of the gabion cage. This method can simulate the working state of an actively unloading gravel-reinforced structure in a tunnel indoors, realistically reproducing the stress and unloading mechanisms of such structures and reflecting the overall stiffness evolution characteristics.

This invention relates to the field of solid propellant measurement technology, specifically to an interfacial strain measurement device under temperature and pressure synergy conditions. It includes an experimental chamber with mirror-distributed sliding doors rotatably connected to it. A controller is installed on one side of each sliding door. Inside the experimental chamber are a first fixed frame and an interfacial strain measurement module electrically connected to the controller. An electric actuator electrically connected to the controller is fixed to the first fixed frame. A second fixed frame is fixed to the telescopic end of the electric actuator. A drive motor electrically connected to the controller is located on the side of the second fixed frame away from the telescopic end of the electric actuator. This invention simulates the phenomenon of a propellant gradually shortening in length during combustion by cutting the propellant grain. The interfacial strain measurement module then performs layered measurements of the propellant grain, achieving the measurement of interfacial strain under different layered conditions without burning the propellant grain.

The invention relates to the technical field of mine safety monitoring, and discloses a device and method for measuring mining-induced stress, temperature and water pressure of a mine, the device comprises a high-strength metal shell, a hollow connecting rod, a water pressure measuring unit, a strain measuring unit, a temperature measuring unit and a single through optical fiber, and the surface of the shell is provided with a spiral resin grouting channel; a mechanical occlusion structure is constructed through a solid resin entity, and rock mass displacement is equivalently transmitted to a shell. The temperature compensation fiber bragg grating is coated with a heat insulation coating, in-situ rigid coupling is achieved by injecting liquid resin into a grouting channel, the central wavelength peak value of each grating is obtained through the wavelength division multiplexing technology, the environment temperature variable quantity is extracted based on the temperature compensation fiber bragg grating, and therefore the thermally induced drift distance of the strain grating is deducted, and the compensated strain value is obtained. And inverting and outputting the in-situ three-dimensional mining-induced stress state by mapping the constitutive equation set. According to the invention, synchronous high-fidelity acquisition of multi-physics field parameters is realized, and the intrinsic safety characteristic and the electromagnetic immunocompetence are realized.

The embodiment of the invention discloses a metal flow stress prediction method and system based on multi-physics field attention, and the method comprises the steps: carrying out the material characteristic coding of the material components and microstructure parameters of a metal material through employing a material characteristic embedding layer of an improved Kolmogov-Arnod network KAN, and obtaining the material characteristics of the metal material; obtaining a characteristic vector of the metal material; carrying out weighted fusion on a plurality of physical field parameters corresponding to isothermal strain measurement by adopting a multi-physical field attention layer of an improved KAN to obtain a high-order feature vector; and performing flow stress prediction on the high-order feature vector and the feature vector based on the temperature value of the isothermal strain measurement by adopting the improved KAN mixed sensing layer to obtain the flow stress of the metal material under the isothermal strain measurement. The accuracy of flow stress prediction can be improved.

The present application relates to a kind of displacement reconstruction method based on improved inverse finite element method suitable for arbitrary boundary floating raft structure, the present application constructs unified constraint least square mathematical framework fusing fixed boundary and elastic boundary, based on displacement measurement data, angle measurement data, strain measurement data, the constraint condition updating of mathematical framework is carried out, based on elimination method, it is proposed that arbitrary boundary inverse finite element method develops displacement field solution, effectively expands the universality of existing inverse finite element method to special boundary constraint (such as elastic support). Compared with prior art, the present application fuses strain data and displacement data, effectively solves the displacement reconstruction problem of floating raft structure under the constraint of arbitrary boundary condition, can be widely popularized in the field such as ship, aerospace and other fields facing large raft structure deformation needs to carry out deformation reconstruction.

The present application relates to the technical field of nuclear power plant containment structure deformation measurement, and discloses a pressure deformation measurement method for a nuclear power plant containment and related devices. The method comprises obtaining the outer curved surface geometric design parameters and correction parameters of the outer dome at the outer monitoring point, and the inner curved surface geometric design parameters of the inner dome at the inner monitoring point; obtaining the strain measurement value of the outer monitoring point of the outer dome under the action of the environmental load in the state that the inner shell bears the internal pressure; determining the free displacement estimation value of the outer shell at the outer monitoring point; determining the actual displacement value of the outer shell in the environment; determining the relative displacement change between the inner monitoring point and the outer monitoring point; and determining the deformation displacement of the inner shell at the inner monitoring point under the loaded state. The present application does not need to set up components such as metal wires inside the inner shell which are easily affected by temperature, but calculates the deformation displacement of the inner shell by the strain measurement value, the relative displacement measurement value, and the geometric design parameters and correction parameters, so as to weaken the interference of temperature on the measurement result.

The application relates to a laser direct writing strain gauge and a preparation method and application thereof, and belongs to the technical field of strain measurement and sensors. The strain gauge comprises a carbonizable flexible substrate, a laser direct writing carbon piezoresistive material, an elastomer encapsulation layer and an electrical lead-out structure; the laser direct writing carbon piezoresistive material is obtained by laser direct writing on the carbonizable flexible substrate; the laser direct writing carbon piezoresistive material is supported by a flexible substrate layer left after carbonization; and the laser direct writing carbon piezoresistive material is a linear pattern formed by mutual connection of no less than two carbon dots or a planar pattern formed by arrangement of no less than four carbon dots. The strain gauge simultaneously realizes low temperature coefficient and high strain sensitivity, can be independently used as a self-supporting structure, can be integrated with an external sensing carrier, and is used for strain testing. The strain gauge is suitable for strain measurement requirements under various complex working conditions and has good engineering adaptability and application flexibility.

The invention discloses a high-temperature dynamic strain test system and method, and relates to the technical field of high-temperature vibration test and strain measurement, and the system comprises a high-temperature loading measurement unit, a signal extension shielding line and a signal conditioning unit. The high-temperature loading measurement unit comprises a high-temperature strain measurement sheet and a compensation sheet which are respectively adhered to the tested piece and the accompanying test piece, and the high-temperature strain measurement sheet and the compensation sheet are in common-ground connection through a shielding layer by adopting a five-wire wiring method; the signal conditioning unit adopts a symmetrically-arranged double constant current source power supply and differential amplification structure, so that sensitivity deviation and common-mode noise interference caused by lead resistance change are effectively inhibited; according to the method, the maximum strain point is accurately positioned through the combination of finite element simulation and test, a dynamic resistance signal is directly converted by adopting constant-current excitation, and accurate acquisition of a strain signal in a high-temperature vibration environment is realized. According to the invention, the problems of obvious lead resistance influence and insufficient noise suppression capability in traditional measurement are solved, and high-precision and high-reliability measurement of dynamic strain of high-temperature parts such as aero-engine blades is realized.

The invention relates to the field of high-performance adhesives, in particular to a double-component adhesive for a strain gauge and a preparation method of the double-component adhesive, and the adhesive is composed of a component A and a component B, the component A comprises an epoxy resin system and a solvent, the epoxy resin system comprises bisphenol A type epoxy resin, bisphenol F type epoxy resin and a reactive diluent, and the solvent is tetrahydrofuran; the component B comprises a curing agent, a curing catalyst and a solvent, the curing agent is pyromellitic dianhydride, the curing catalyst comprises N, N-dimethyl benzylamine and salicylic acid, and the solvent is tetrahydrofuran; the mass ratio of the component A to the component B is (3: 1)-(4: 1), the working temperature range of the adhesive is from-269 DEG C to 210 DEG C and is far higher than that of a traditional epoxy adhesive, and the adhesive is particularly suitable for strain measurement in an extreme temperature environment.

The present application provides a kind of aperture deformation measuring device, including inner sleeve, clamping ring assembly, sliding assembly, articulated support assembly, traveling wheel and guide assembly, the inside of inner sleeve is provided with strain measuring device, strain measuring device has a measuring element, inner sleeve has a measurement hole site, measuring element corresponds with measurement hole site;Clamping ring assembly is fixed to the outside of inner sleeve;Sliding assembly is fixed to the outside of inner sleeve;Articulated support assembly is fixed on clamping ring assembly, and is slidably connected with sliding assembly;Traveling wheel is fixed on articulated support assembly;Guide assembly is fixed to the outside of inner sleeve;Wherein, articulated support assembly is on measuring element, traveling wheel is on the hole wall of the hole to be measured, to be driven by hole wall to press traveling wheel and bring the articulated support assembly relative to inner sleeve telescopic sliding, in turn, by telescopic sliding articulated support assembly press measuring element moves in measurement hole site, to measure the aperture deformation data of the hole to be measured.

To provide a strain gauge that can achieve improvement of practicality. A nano-granular structure film constituting a resistor 2 formed on one main surface of a substrate 1 of a strain gauge has a composition represented by a general formula L100-a-b-cMaFbOc (L is one or more metal elements selected from Fe, Co, Ni, Pt, Au, Ag, and Cu; M is one or more elements selected from Li, Mg, Al, Ca, Sr, Ba, Gd, and Y: F is fluorine: O is oxygen; and 40.0≤(a+b+c)≤63.0). The resistor 2 is constituted of a nano-granular structure film in which metal particles Q1 represented by L and having an average particle diameter of 1.0 to 5.0 nm are distributed in an insulating matrix Q2 formed of a fluoride of M or a fluoride and an oxide of M.

This invention discloses a shear force distribution demonstration device and measurement method, belonging to the field of structural engineering teaching technology. The device includes a base, a support mechanism, a loading mechanism, a demonstration mechanism, and a measurement mechanism. The support mechanism is a frame structure with sliding rails; the loading mechanism has replaceable supports with switchable constraints; the demonstration mechanism uses replaceable vertical columns with four-jaw chuck sleeves; and the measurement mechanism includes a strain measurement module, an S-shaped tension sensor, and a positioning ruler. This device adopts a fully modular, quick-release design, allowing for rapid switching between series and parallel systems, column constraint forms, and parameters. It simultaneously demonstrates the core knowledge points of inter-story force transmission in series and intra-story force distribution in parallel, verifying the shear force distribution law through measured data. This invention is easy to operate, combining visualization and quantitative measurement, effectively solving the pain points of abstract and difficult-to-understand traditional teaching methods, and significantly improving teaching effectiveness.

The present invention relates to a sensor system (20) for detecting structural deformation. The sensor system (20) comprises a sensor device (22). The sensor device (22) is designed to be mounted on a surface of a structure (10) and to detect structural deformation in this surface. The sensor device (22) comprises a sensor mesh (30) with at least one strain-measuring fiber (32, 34, 36). The sensor system (20) has a carrier substrate designed to attach the strain-measuring fiber (32, 34, 36) to the surface of the structure (10). The invention also relates to a sensor mesh (30).

This strain measurement device has an elastic member and a strain-inducing member. The elastic member has: a first flat plate part fixed to a shear-force input part or output part; at least one second flat plate part disposed parallel to the first flat plate part and fixed to the output part or input part; and a pair of beam parts connected to the first flat plate part and the second flat plate part. The strain-inducing member is connected to the pair of beam parts of the elastic member, and has at least one strain gauge disposed thereon.

The application discloses a kind of concrete high-temperature strain measuring device, system and method, including support, further including the measuring device of installation on support;Support includes upper horizontal support, lower horizontal support and vertical support, measuring device includes the upper sliding sleeve and lower sliding sleeve of sleeve joint on vertical support, first probe rod and second probe rod are respectively installed on upper sliding sleeve and lower sliding sleeve;First probe rod one end is connected with upper sliding sleeve, other end is provided with recess, second probe rod one end is connected with lower sliding sleeve, other end is provided with recess;Radial displacement sensor is installed on upper horizontal support or lower horizontal support, axial displacement sensor is installed on upper sliding sleeve or lower sliding sleeve;The application can measure the axial displacement and transverse displacement of concrete test block by first probe rod and second probe rod leading out high-temperature furnace, realize the strain measurement of test piece under high temperature, to avoid the influence of high-temperature environment on instrument.

This invention belongs to the field of stress-strain testing technology, specifically relating to a welded strain gauge for nuclear power plant testing. Both the strain gauge and the terminals are mounted on a metal base. The strain gauge consists of a main strain gauge and a compensating strain gauge. The strain gauge and the terminals are connected by wires. Measuring wires are also connected to the terminals. Measuring wire one has a male connector, and measuring wire two has a female connector. Measuring wire one and measuring wire two are connected via the male and female connectors. Measuring wire two is connected to a compensating bridge box. The compensating bridge box contains two precision resistors, forming a Wheatstone bridge with the main strain gauge and the compensating strain gauge on the metal base. This invention is used for stress-strain measurement on the surface of pressure vessels such as nuclear power pressure pipelines.

Methods and devices for estimating the weight of a vehicle are disclosed. An exemplary device comprises at least one processor circuit for obtaining strain measurement data from a strain gauge, wherein the strain gauge is coupled to a surface of a shock absorber dome of a vehicle, estimating a permissible total weight of the vehicle based on the strain measurement data, and outputting the permissible total vehicle weight for display via a user interface.