391 results about "Strain measurement" patented technology

The invention discloses a creep test system of a turbine rotor blade film hole simulation piece and a test method of the creep test system. Comprising a clamping assembly used for fixing a test piece, a loading assembly used for applying a load to the test piece, a strain measuring assembly used for measuring the strain rate of the test piece, a heating assembly used for covering the test piece to form a heating channel, and a cooling assembly used for manufacturing and conveying cooling airflow to flow through the interior of the test piece, the strain measurement assembly is used for measuring the external temperature of the test piece and the internal temperature of the test piece, the control assembly is connected with the strain measurement assembly, the heating assembly, the cooling assembly and the temperature measurement assembly, and the heating assembly is used for manufacturing and conveying high-temperature airflow to flow through the heating channel so as to heat the outside of the test piece to a first set temperature; the cooling assembly is used for cooling the interior of the test piece to a second set temperature, and the heating assembly and the cooling assembly are used for forming a dynamic convection environment around the test piece.

The invention relates to the technical field of structural deformation shape reconstruction, in particular to a novel inverse finite element deformation reconstruction method based on virtual deformation field physical constraint. According to the method, a virtual displacement field obtained by sparse strain through inverse finite element reconstruction is used as a strain extrapolation physical constraint; and an iteration thought is adopted, extrapolated strain and measured strain are used for inverse finite element deformation reconstruction again, a new virtual displacement field is obtained, and therefore strain extrapolation can be restrained again. And continuously iteratively reconstructing virtual deformation and extrapolation strain in this way, and finally reconstructing real structural deformation. And determining the accuracy rate of the deformation characterization values based on a plurality of actually measured actual deformation characterization values and a plurality of deformation characterization values determined by the extrapolation strain data, and determining the deformation reconstruction state based on the accuracy rate. According to the method, the strain measurement points are extrapolated through iteration in the deformation reconstruction process, and the virtual displacement field is used as physical constraint, so that the accuracy of deformation reconstruction is improved.

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 disclosure relates to monitoring blades of a wind turbine rotor shaft. Example embodiments include a computer-implemented method of monitoring blades of a wind5 turbine (100), the wind turbine (100) having a plurality of blades (103a, 103b) mounted to a hub (102), each blade (103a) comprising one or more strain sensors (109a1-3) mounted to the blade (103a) at corresponding respective distances from the hub (102, 201) along the blade (103a), the method comprising: i) recording (1301) strain measurements from the strain sensors (109a1-3) on each of the plurality of blades10 (103a); ii) recording (1302) a rotor speed of the wind turbine (100); iii) calculating (1303) a statistical measure of each of the recorded strain measurements; iv) calculating (1304) a difference in the statistical measure for strain sensors at corresponding positions on each of the plurality of blades over a range of rotor speeds; and v) identifying (1305) the presence or absence of damage in one of the plurality of blades15 based on the calculated difference.

The invention discloses a rock shear seepage coupling true triaxial test system, which relates to the technical field of rock mechanical tests, and comprises a host, a sigma 1 / sigma 2 direction loading module, a sigma 3 direction confining pressure module, a pressure chamber auxiliary system, a sample clamp, a pore water seepage system, a temperature system, a control module and a data acquisition and processing module, through servo closed-loop linkage double-pump loading in the sigma 1 / sigma 2 direction, synchronous output of the double pumps and coordination of pressure supply of the two oil cylinders by the controller, a strain correction algorithm is combined, stability of a stress loading center is guaranteed, strain measurement accuracy is improved, confining pressure is accurately controlled in the sigma 3 direction through a double-balance pressure chamber and a pressure regulation algorithm, and the stress measurement accuracy is improved. The pressure chamber is in full-automatic operation, manual steps are omitted, errors are reduced, efficiency is improved, a stress-free blank angle clamp eliminates friction interference, a seepage system supports a double-loading mode, a control module achieves multi-control-mode impact-free switching, a data processing module is combined with an elastic modulus calculation algorithm, rock mechanical parameters are accurately obtained, and the multi-field coupling test requirement is met.

The invention provides an anti-counterfeit label film coating tension control method and system, and relates to the technical field of film coating tension control. The method comprises the following steps: acquiring surface image data of a substrate film; identifying and acquiring real-time coordinates of the feature points; calculating the local strain of the substrate film according to the real-time coordinates of the feature points; calculating to obtain a strain deviation; calculating the time required by the film section corresponding to the strain deviation to reach the film coating station as the adjustment time; calculating a tension compensation amount according to the strain deviation; and within the adjusting time, the tension control unit adjusts the tension applied to the substrate film according to the tension compensation amount. According to the method, through accurate local strain measurement and prospective tension adjustment, it is ensured that each section of film is kept in an ideal strain state at the moment of film coating, so that the integrity and functional effectiveness of optical microstructures such as diffraction gratings are thoroughly protected, and the technical problems in anti-counterfeit label film coating production are effectively solved.

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 discloses a component multi-dimensional information measurement method and system based on multi-source information fusion, and the method comprises the steps: 1, obtaining a fluorescence speckle image and a texture image before deformation, and decomposing the two images into low-frequency features and high-frequency features through discrete wavelet transform; 2, fusing low-frequency features of the fluorescence speckle image and the texture image before deformation; fusing the high-frequency features of the fluorescent speckle image and the texture image before deformation; 3, reconstructing the fused low-frequency features and high-frequency features through inverse wavelet transform to obtain a fused image before deformation; 4, acquiring a fused image after deformation; 5, the three-dimensional shape of the component is obtained through an FPP method; then calculating a sub-pixel-level displacement field, and constructing a three-dimensional displacement field according to the three-dimensional morphology and the sub-pixel-level displacement field; and extracting a partial derivative of the three-dimensional displacement field to the pixel coordinate, and calculating the Green strain tensor. According to the invention, the interference of environmental factors on displacement and strain measurement is effectively overcome, and the measurement precision and robustness are improved.

The invention discloses a chip carrier plate flexible leveling system and a control method, and relates to the technical field of photoetching machine parts and chip production. According to the scheme provided by the invention, a parallelism detection device constructed based on a strain detection device is utilized, and a mapping relation between a strain value and an inter-plate distance is established; during use, a plurality of parallelism detection devices are arranged between a chip carrier plate and a target substrate, high-precision parallelism measurement and feedback adjustment are realized through a mapping relation between strain values and inter-plate distances and based on numerical value differences of strain measurement values, accurate inter-plate parallelism adjustment is realized, and the accuracy of the inter-plate parallelism is improved. The technical problem that an existing leveling system is large in parallelism detection and leveling effect error is solved.

The invention relates to a contact type heating high-temperature tensile test system suitable for plates in the technical field of material high-temperature mechanical property testing, and the system comprises a loading module which is used for being connected with a testing machine and cooperating with a clamping module to apply an acting force to a sample so as to realize a tensile process; a heating block of the heating module is controlled by an air cylinder with a free stroke to move so as to be tightly attached to the sample for heating, and a window for observing the sample is formed in the external heat preservation box; according to the device, a contact type heating mode is adopted to achieve heating of a sample piece, the heating speed is high, the sample is heated evenly, the sample can rotate by 90 degrees, heating and strain measurement are achieved respectively, laser temperature measurement and the heating rod are coupled through the temperature controller, accurate control over the temperature is achieved, and the device is simple in structure, convenient to operate and high in practicability. The high-temperature area and the normal-temperature area are separated by a thermal insulation material, and the high-temperature area adopts clearance fit to ensure sufficient thermal expansion space of the pin, so that high-temperature adhesion is prevented.

The invention discloses a resistance strain gauge sensitivity coefficient measuring device, which belongs to the technical field of resistance strain measurement and comprises a support, a displacement generation mechanism, a displacement detection mechanism and a steel ruler. The displacement generation mechanism comprises a swing arm and a mounting seat, the swing arm is mounted on the support and forms a lever structure, two ends of the straight steel ruler are detachably connected with the short arm end of the swing arm and the support respectively, and a strain gauge pasting area is arranged on the surface of the straight steel ruler; the displacement detection mechanism comprises at least one displacement sensor. The upper end of the steel ruler can be driven to generate axial displacement of a corresponding distance through the lever action of the swing arm, so that the strain gauges synchronously generate telescopic deformation, the real strain of the steel ruler and the strain gauges can be directly measured through the displacement sensor, and finally the sensitivity coefficient can be obtained according to the resistance change rate of the strain gauges. And the reliability and the effectiveness of a measurement result are improved.

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 strain measurement, and discloses a tunnel steel arch bearing capacity early warning method and system.The method comprises the steps that micro-strain pulses, curvature change voltage and high-frequency stress wave signals of key nodes of a steel arch are synchronously collected; fusing the strain change rate and the curvature acceleration to calculate a dynamic load gradient distribution parameter; stress wave energy abrupt change characteristics and voltage equivalents are extracted through wavelet packet decomposition and frequency domain differential; inputting the load parameters and the energy characteristics into a coupling damage evaluation model, and generating a real-time stress risk coefficient through exponential attenuation correction and convolution operation; and when the voltage equivalent exceeds a self-adaptive threshold value and the risk coefficient meets a critical condition, triggering a stress grading early warning instruction. According to the method, the problem of lack of a multi-physical-quantity cooperative monitoring and dynamic risk assessment coupling mechanism during early warning of the bearing capacity of the tunnel steel arch is solved, and the early warning precision and timeliness are remarkably 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 discloses a high-temperature-resistant passive strain gauge for gas turbine blade monitoring and a preparation method and application thereof, and belongs to the technical field of gas turbine health monitoring. The high-temperature-resistant passive strain gauge comprises a strain gauge substrate, an insulating layer, a snakelike sensitive grid, a fiber bragg grating (FBG) and a yttria-stabilized zirconia (YSZ) protective layer. The strain gauge has the beneficial effects that aiming at the limitation of a traditional sensor in a high-temperature (greater than or equal to 1200 DEG C), high-frequency vibration and corrosion environment, the strain gauge adopts the high-temperature-resistant platinum-tungsten alloy snakelike sensitive grid, the single crystal aluminum oxide ceramic substrate and the sapphire fiber bragg grating to transmit a strain signal through wavelength shift, and an external power supply is not needed; and the Ir-Re alloy is brazed and fixed to the microgroove in the surface of the blade, the shearing strength is high, and the service life is long. The method overcomes the technical bottleneck of strain measurement in a high-temperature environment, is suitable for scenes of aero-engines, gas turbine blades and the like, and remarkably reduces the maintenance cost and improves the monitoring reliability.

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.

The invention provides a special-shaped test piece fatigue test loading device. The special-shaped test piece fatigue test loading device comprises an upper connector, a lower connector, a main shaft, a transverse shaft, a lower connector transverse shaft, a clamping plate, a bolt, a support and a clamping block. The test piece is connected through the main shaft and the two transverse shafts, and the support and the test piece are connected through the clamping plates and the bolts. The pull rods on the single-lug upper connector and the double-lug lower connector are clamped on an electro-hydraulic servo fatigue testing machine, and loading of a test piece is achieved through pulling and pressing of the testing machine on the lugs of the upper connector. The strain measuring device comprises a strain gauge and a signal transmission processing device, and the strain gauge is installed on a main examination part of the test piece according to test requirements. Through the fatigue test device, accurate load application of the special-shaped structural member is realized, and a fatigue test is completed.

The invention discloses a transparent fractured rock mass stress-seepage-dissolution coupling dynamic visualization test device and method. The device comprises a sample fixing and adjusting platform, a pair of opposite transparent plates are arranged, a transparent soluble fracture sample can be fixed, and an adjustable mechanism is arranged to change and lock the fracture opening degree; the seepage pressure control and measurement device can inject fluid into the fracture, control the flow velocity and monitor the pressure; the confining pressure loading device is provided with a closed pressure gas cavity, an inert gas injection device and a gas pressure sensor and is positioned on the outer side of a transparent plate, and after inert gas is injected into the cavity, uniform confining pressure is applied to a transparent fracture surface through the transparent plate and is monitored; the visual observation device comprises a CCD camera, a light source and a three-dimensional XT-DIC full-field strain measurement system, and the CCD camera and the light source are arranged on the observable side of the sample and can dynamically observe and record the corrosion form, displacement and full-field strain of the fracture wall surface in real time. According to the invention, direct observation of the seepage behavior, the deformation damage change and the corrosion form in the hydraulic coupling process of the soluble rock mass fracture can be realized.

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.

A stress monitoring method suitable for a special-shaped wind tunnel pressure shell belongs to the field of stress analysis and testing technology. It is to solve the problem of safety in the operation and use of special-shaped wind tunnels. The present invention establishes a finite element simulation model of the special-shaped wind tunnel pressure shell based on the structure of the special-shaped wind tunnel pressure shell, performs static structural calculations, obtains finite element calculation results of the special-shaped wind tunnel pressure shell, selects stress monitoring points, and marks stress monitoring points at corresponding positions of the special-shaped wind tunnel pressure shell; welds and installs strain gauges on the stress monitoring points marked on the special-shaped wind tunnel pressure shell, connects the strain gauges to the collection box, and connects the collection box to the control box of the strain data acquisition instrument. During the operation of the wind tunnel, the strain data acquisition instrument collects the strain measurement values of the strain gauges and converts them into stress values of the stress monitoring points; the strain data acquisition instrument control box is connected to the host computer via Ethernet, and the host computer monitors the stress values in real time. The monitoring of the present invention is accurate.

The invention relates to the technical field of optical fiber sensing, in particular to a distributed optical fiber space pose sensor and a space pose measuring method and system based on the distributed optical fiber space pose sensor, and the sensor comprises a bottom lining which is made of nickel-titanium alloy wires and has torsion resistance and superelasticity; a plurality of V-shaped grooves are engraved in the surface of the bottom lining along the axial direction of the bottom lining and are symmetrically distributed along the circumference of the bottom lining; and the plurality of sensing optical fibers correspond to the plurality of V-shaped grooves and are respectively fixed in the corresponding V-shaped grooves. The system comprises the distributed optical fiber space pose sensor. The strain measurement module is used for measuring strain information generated by deformation of the distributed optical fiber space pose sensor; and the reconstruction device is used for calculating and reconstructing the spatial pose of the distributed optical fiber spatial pose sensor according to the strain information. The problems that an existing spatial pose sensor is prone to torsion and low in reconstruction precision are solved, and the spatial pose sensor has the advantages of being high in geometric stability and large in fiber core distance.

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 discloses a system and a method for measuring the electrostrictive strain of a ferroelectric material under variable temperature and variable load conditions. The system comprises a thermal field generation unit, a test signal generation unit, a strain measurement unit and an equipment control and data analysis unit. The method comprises the following steps: setting a temperature through a thermal field generation unit and changing the temperature according to a test requirement; adjustable voltage excitation is generated through the test signal generation unit; the strain measurement unit is used for measuring the output micro mechanical displacement of the to-be-measured sample generated by the electrostrictive strain effect under the real force load condition; and the equipment control and data analysis unit is used for generating an electrostrictive strain loop and a real-time strain curve. The device is suitable for ferroelectric samples in various forms, high-stability and high-sensitivity electrostrictive strain testing can be achieved in complex thermal field and force field environments, and a stable electrostrictive strain loop and a real-time strain curve can be generated.