241results about "Electrical/magnetic solid deformation measurement" patented technology

This invention relates to the field of structural health monitoring of nuclear power plant equipment, and in particular to a method for testing the performance of high-temperature resistant long-wire strain gauges. The method includes: Step 1: Determining the temperature step for strain testing of the strain gauge; Step 2: Installing the strain gauge on a measuring beam; Step 3: Conducting room-temperature performance testing of the strain gauge; Step 4: Increasing the temperature of the high-temperature loading furnace, and repeating Step 3 under different temperature step conditions, respectively measuring and collecting the strain output, strain gauge lead-end resistance, and lead resistance of the strain gauge at each temperature step; Step 5: Calculating the actual strain; Step 6: Calculating the loaded strain; Step 7: Calculating the relative sensitivity coefficient. This invention enables the testing and calibration of the thermal output and sensitivity coefficient of high-temperature resistant long-wire strain gauges as a function of temperature. It provides accurate test data for the accurate testing and calibration of the thermal output and sensitivity coefficient of high-temperature resistant long-wire strain gauges as a function of temperature, and is of great significance.

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.

To provide a method for adjusting a resistance value of a strain gauge with which a resistance value can be adjusted regardless of the presence or absence of a protective layer.SOLUTION: The present method for adjusting a resistance value of a strain gauge includes: a step of preparing a strain gauge having a substrate, a resistor formed on the substrate, and a resistance adjustment part formed on the substrate; and a step of irradiating the resistance adjustment part with a laser beam. The resistance adjustment part includes a plurality of grid resistances connected in series with the resistor, and a trim resistance connected in parallel with a series circuit including the adjacent two grid resistances. The trim resistance includes a first resistance part, and a second resistance part laminated on a part of the first resistance part. The grid resistances and the first resistance part are formed of the same material as the resistor, and the second resistance part is formed of a material having a lower volume resistivity than the first resistance part.SELECTED DRAWING: Figure 1

A tire has at least an electrically-conductive rubber. The electrically-conductive rubber has a contacting portion provided at a position contacting a rim.

The application discloses a kind of grouping micro column structure cloth-based flexible strain sensor and method, first liquid elastomer and conductive elastomer are scraped to the surface of conductive fabric, then it is heated and dried;Second step, the solidified liquid elastomer is processed in region with laser cutting machine, the solidified elastomer outside micro column region is cut off, and support micro column array is obtained;Third step, after the region processing of conductive elastomer with laser cutting machine, the top of conductive micro column is cut again, and control micro column array is obtained;Fourth step, the columnar head of support micro column array is immersed in adhesive, then the conductive elastomer thin layer around control micro column array is pressed tightly from top to bottom, and is bonded, waits for adhesive to be completely solidified, and grouping micro column structure cloth-based flexible strain sensor is obtained.The method has very important practical value and innovative significance for the rapid preparation and integration of flexible strain sensor with adjustable sensitivity, adjustable strain range and comfortable wearing.

The application mainly relates to a nonlinear resistance strain sensor. The nonlinear resistance strain sensor comprises an elastic base and a conductive substance, and the conductive substance is uniformly distributed on the elastic base. When the elastic base is pulled, the length of the elastic base is correspondingly lengthened, the density of the conductive substance on the elastic base is reduced, and the overall resistance is changed. In the above manner, the nonlinear resistance strain sensor has the nonlinear high-sensitivity resistance strain performance.

This invention provides a conductive elastic composite yarn, its preparation method, and a knitted strain sensor, belonging to the field of flexible strain sensor technology. This invention prepares intrinsically elastic conductive elastic composite yarn from the material source, overcoming the defect of poor conductive path stability. By mechanically combining the elastic core yarn and the conductive outer yarn through rope braiding or covering processes, the composite yarn structure can be precisely controlled, achieving effective regulation of the mechanical and electrical properties of the conductive elastic composite yarn. After using this conductive elastic composite yarn to prepare a knitted strain sensor, the sensor's sensitivity was significantly improved, proving that the knitting structure is significant for optimizing sensor performance. This "yarn-fabric" design approach helps to further optimize sensor performance.

The application discloses a temperature-strain dual-function sensor for extracorporeal circulation system monitoring, and relates to the technical field of flexible electronics and biomedical engineering. The sensor adopts a three-layer stacking structure, and comprises, from top to bottom, a piezoresistive strain response layer based on a silver / graphene / poly(3,4-ethylenedioxythiophene):polystyrene sulfonate composite conductive film, a thermoplastic polyurethane nanofiber heat insulation isolation layer and a temperature sensitive layer based on a graphene / poly(3,4-ethylenedioxythiophene):polystyrene sulfonate composite conductive hydrogel. The temperature-strain dual-function sensor for extracorporeal circulation system monitoring prepared by the application exhibits high sensitivity and fast response characteristics in temperature and strain sensing, and simultaneously exhibits excellent cycle stability and long-term reliability under repeated deformation.

The present application relates to the technical field of intelligent operation and maintenance of maglev track, and particularly discloses a maglev maintenance base steel beam connecting bolt health monitoring system, which specifically comprises a data acquisition module, a data processing module, a failure diagnosis module and a cloud service platform. The present application sets strain gauges on bolt heads for monitoring, does not need to disassemble or damage the bolts, can monitor the stress of the bolts in service state without affecting the structural integrity, reduces the risk and cost in the monitoring process, in addition, monitors the vibration characteristics of the steel beam, indirectly obtains information about whether the bolt connection is normal, finally, adopts image recognition technology to monitor the bolt loosening in real time, the fusion of the above three technologies of direct stress, indirect representation and image monitoring, superimposed with maglev vehicle operation condition data, can provide comprehensive structural health monitoring information, which is helpful for comprehensively evaluating the overall performance and safety of the connecting bolts and real-time early warning.

The application discloses a kind of based on continuous gradual change micro-nano structure's bionic antireflection light-thermal sensing material and its preparation method, method includes the following steps, provide elastic substrate layer, intermediate conductive layer and upper layer heat-sensitive layer;Wherein, elastic substrate layer is high molecular elastic polymer, intermediate conductive layer includes silicone rubber and carbon nanotube blend, upper layer heat-sensitive layer includes silicone rubber, carbon black and carbon nanotube blend;Elastic substrate layer is formed into elastic plane material using heat curing or light curing mode, on its upper surface, spray conductive layer in normal temperature environment, after drying and annealing, obtain solidified intermediate conductive layer;Subsequently, with light-thermal sensitive layer again spraying, after heating and curing, obtain upper layer heat-sensitive layer, the application is through interface bionic structure, the synergic design of conductive material and light-thermal material, effectively improve the light absorption efficiency and response sensitivity of sensing material.

This disclosure relates to the field of remote sensing and mapping technology, and provides an adaptive distributed scatterer interferometry method, apparatus, and medium for mountainous areas. The method includes: acquiring radar image data and digital elevation model (DEM) data of the target monitoring mountainous area; calculating the radar vegetation index of each pixel in the dual-polarization synthetic aperture radar (DAP) image sequence and classifying it into multiple vegetation coverage levels to obtain a vegetation coverage grading atlas; identifying statistically homogeneous pixels in each image scene under the spatial constraints of vegetation coverage levels according to the grading atlas to determine a candidate set of distributed scatterers; further, using the grading atlas, performing adaptive coherence threshold filtering on each candidate point to obtain multiple distributed scatterers; and determining the long-term surface deformation results of the mountainous area based on the multiple distributed scatterers, the DAP image sequence, and the DEM data. This embodiment effectively improves the accuracy and reliability of distributed scatterer extraction and is suitable for deformation monitoring in complex mountainous areas.

This utility model relates to a six-dimensional torque sensor system. Through integrated circuit design and packaging within the six-dimensional torque sensor, high-precision and highly sensitive deformation sensing and electrical signal conversion output are achieved via strain gauges on the elastic beams of the main frame structure. After specific measurement using a half-bridge differential Wheatstone bridge, the measured signal is amplified, filtered, and converted from digital to analog data by an ADC chip before being sent to a lower-level computer. The lower-level computer then reads the acquired sensor measurement signal, forming a high-precision circuit design specifically matched to the six-dimensional torque sensor. The coordinated installation of the strain gauges, half-bridge differential Wheatstone bridge, and ADC chip makes it less susceptible to environmental factors and effectively suppresses noise interference while achieving high signal gain, effectively realizing the measurement output function of the six-dimensional torque sensor.

This utility model discloses a rapid testing device for rock deformation parameters, comprising a protective shell, one end of which is connected to the drill pipe and the other end to the drill bit. A power supply module, a resistance strain gauge group, a deformation parameter testing module, and a wireless transmission module are installed inside the protective shell. The power supply module provides power to the resistance strain gauge group, the deformation parameter testing module, and the wireless transmission module. The internal power supply line connecting the power supply module and the resistance strain gauge group is connected to the deformation parameter testing module via a signal transmission line. The deformation parameter testing module is electrically connected to the wireless transmission module. This utility model, by deploying resistance strain gauges, the deformation parameter testing module, and the wireless transmission module, monitors the strain signal generated by the interaction between the drilling equipment and the rock in real time, achieving rapid, accurate, and real-time testing of the Poisson's ratio of the rock mass during drilling, thereby guiding the evaluation of surrounding rock stability and the optimization design of support schemes in underground engineering.

The estimation device comprises: an acquisition unit acquiring first a detection result obtained by a first sensor and a second detection result obtained by a second sensor, the first sensor being provided away from a palm side portion of a hand of a worker and detecting a first physical quantity related to bending of a finger of the worker, the second sensor being mounted on a forearm portion of the worker and detecting a second physical quantity related to a movement of muscle in the forearm portion; and an estimation unit estimating a finger force generated in the finger using the first detection result and the second detection result.

This invention relates to an online monitoring device for diaphragm deformation of an ultra-clean diaphragm valve based on a flexible piezoelectric thin film, comprising: a piezoelectric thin film sensor array for converting the deformation state of the diaphragm valve into an electrical signal to be extracted; a signal extraction component for extracting the electrical signal to the outside of the valve body; a signal acquisition component for acquiring the electrical signal extracted to the outside of the valve body; and a consistency comparison and discrimination component for judging the deformation state of the electrical signal and obtaining the deformation state judgment result; wherein the piezoelectric thin film sensor array, the signal extraction component, the signal acquisition component, and the consistency comparison and discrimination component are connected sequentially. This invention eliminates the need for sensor placement on the medium side, does not affect the cleanliness of the ultra-clean fluid channel, and uses relative consistency as the criterion, reducing the dependence on absolute amplitude calibration, making it suitable for engineering installation and online early warning.

The application provides a biaxial stretching uniaxial sensitive flexible strain sensor based on a cavity sandwich structure and a preparation method thereof. The flexible strain sensor comprises a flexible packaging substrate, a suspended channel, a micro flow channel, a liquid metal conductive unit and a cavity. The flexible packaging substrate is made of an elastic polymer material and is integrally formed through 3D printing and curing treatment. The cavity is arranged in the flexible packaging substrate. The suspended channel is connected with the flexible packaging substrate at an end position and is in a floating state. The micro flow channel penetrates the end position and is connected with the suspended channel. The liquid metal conductive unit is injected into the suspended channel through the micro flow channel. When the flexible strain sensor is stretched along a sensitive direction, the suspended channel is synchronously stressed due to the connection with the end position, and then deformation occurs, so that the resistance value of the liquid metal conductive unit is significantly changed. When the flexible strain sensor is stretched along a non-sensitive direction, the suspended channel is in a floating state due to the existence of the cavity, and the deformation of the suspended channel is negligible.

This application relates to the field of steering column tube welding and forming technology, specifically disclosing a welding and forming equipment for steering column tube production. The equipment includes a fixed platform, a sliding platform slidably disposed on one side of the fixed platform, a placement platform raised and lowered at the upper end of the sliding platform, an adjusting component and a frame disposed on one side of the sliding platform, a clamping assembly disposed on the frame and the fixed platform, a welding mechanism disposed between the fixed platform and the sliding platform, and a detection assembly disposed on one side of the fixed platform. The upper and lower column shells are placed on the fixed platform and the placement platform respectively. The adjusting component in this application can adjust the centering of the upper and lower column shells through the sliding platform and the placement platform. After adjustment, the clamping assembly provides stable clamping, and the welding mechanism performs skip welding on the upper and lower column shells. The skip welding process effectively controls the welding heat input and reduces overall workpiece deformation. After welding, the detection assembly performs coaxiality detection and deformation detection to determine the coaxiality error and local deformation of the welded parts.

A non-intrusive sensing system for monitoring an electrochemical device and a method of operating the non-intrusive sensing system can include multi-static ultrasonic sensors for detecting data indicative of a property of electrolytic media in an electrochemical device, an acoustic sensor for detecting and measuring a signature of electrodes associated with a health condition of the electrochemical device. A temperature sensor can be used to detect surface temperature data and correlate the surface temperature data with the signature identified and extracted by the acoustic sensor and the data indicative of the property of the electrolytic media. The data detected by the multi-static ultrasonic sensors, the signature detected by the acoustic sensor, and the surface temperature data identified can be subject to feature extraction and processing by a detection and prediction model to produce information pertaining to the safety, reliability and operating efficiency of the electrochemical device.

This invention relates to the field of geological environment monitoring technology and provides a method for constructing and monitoring carbon sequestration leakage stress indices based on integrated air-ground technology. The method includes the following steps: acquiring SAR and optical time-series remote sensing data; calculating the surface deformation index and vegetation stress index respectively; constructing a comprehensive index through a collaborative enhancement multiplicative model; and identifying leakage risk areas based on index anomalies. This invention effectively suppresses false positives caused by single-factor interference through spatial coupling of physical and ecological signals, significantly improving the accuracy and reliability of monitoring CO2 geological sequestration leaks using remote sensing technology. It provides a core technical solution for achieving large-scale, automated, and low-cost sequestration safety monitoring.

The application discloses a kind of foundation deformation monitoring radar online calibration device, three-prism body mechanism is connected to the tilt angle mechanism, and the tilt angle mechanism is used to adjust the tilt angle of three-prism body mechanism;Tilt angle mechanism is connected to horizontal displacement mechanism, and horizontal displacement mechanism is used to drive tilt angle mechanism together with three-prism body mechanism horizontal movement, adjust the position of tilt angle mechanism and three-prism body mechanism in horizontal direction;The bottom of horizontal displacement mechanism is connected to 360 ° rotation angle displacement mechanism, and 360 ° rotation angle displacement mechanism is used to drive horizontal displacement mechanism 360 ° horizontal rotation;360 ° rotation angle displacement mechanism is fixed to stable support structure;Three-prism body mechanism includes three-prism body and total station prism.The application can realize the calibration of deformation monitoring precision-distance resolution-azimuth resolution three synergies, and can realize the online calibration of foundation deformation monitoring radar, without foundation deformation monitoring radar offline interruption operation.

According to the present disclosure, a strain gauge has: a flexible substrate; a resistor formed on the substrate; and a pair of electrodes formed on the substrate and electrically connected with the resistor via conductive traces, and, in this strain gauge, the conductive traces include a first metal layer and a second metal layer formed over an upper surface of the first metal layer, and the second metal layer is formed in a pattern that is different from a pattern of the first metal layer.

This invention discloses a method for preparing recyclable, anti-swelling hydrogels based on synergistic hydrophobicity and the Hofmeister effect, belonging to the technical field of polymer functional materials and flexible electronic devices. The preparation method of the recyclable, anti-swelling hydrogel of this invention includes the following steps: dissolving a hydrophobically modified polymer in an organic solvent to obtain a polymer solution, then adding an amine compound to obtain a mixture, and performing gelation treatment to obtain a gel precursor; immersing the gel precursor in an aqueous solution containing salt ions for salting-out enhancement treatment to obtain the recyclable, anti-swelling hydrogel. This method, through molecular design, stably introduces specific salt ions (CO3-) into the hydrophobically modified polymer network. 2‑ SO4 2‑ By utilizing the synergistic enhancement effect of hydrophobic interactions and the Hofmeister salting-out effect, a dense composite network structure full of dynamic physical cross-links was successfully constructed.

In a strain gauge having a resistor formed on a flexible substrate, the performance of protecting the resistor is improved. [Solution] The device comprises a flexible resin substrate 10, a functional layer formed directly from a metal, alloy, or metal compound on one surface of the substrate, a plurality of resistors 30 mainly composed of α-Cr formed directly from a film containing Cr, CrN, and Cr2N on one surface of the functional layer, electrodes electrically connected to the resistors, an insulating layer 50 made of an inorganic material covering the resistors, and an insulating resin layer made of an organic material covering the insulating layer. Each of the plurality of resistors 30 has a thickness of 0.05 μm to 2 μm, the thickness of the functional layer is 1 nm to 100 nm, the electrodes include terminal portions 41 extending from the ends of the resistors and a metal layer formed on the terminal portions, and the insulating layer is an oxide film of the metal constituting the metal layer.

Apparatuses that include a junction-isolated semiconductor strain gauge and methods for manufacturing a junction-isolated semiconductor strain gauge are disclosed. In a particular embodiment, an apparatus comprises a silicon chip that includes a silicon substrate and a semiconductor strain gauge. In this embodiment, the semiconductor strain gauge includes a plurality of resistors formed by locally doping the silicon substrate and biasing the silicon substrate such that the resistors of the plurality of resistors are junction-isolated. The silicon chip also includes a field shield layer to isolate an output signal of the semiconductor strain gauge from external electrical fields.

The application relates to a structural health monitoring system and application thereof. A preparation method of a carbon fiber reinforced thermoplastic composite material involved in the system comprises the following steps: providing a plurality of carbon fiber reinforced thermoplastic resin layers; prepositioning a multifunctional sensor unit array between adjacent thermoplastic resin layers, the multifunctional sensor unit array comprising a functional film containing ferroelectric ceramic, an electrode layer, and an insulating protective layer between the functional film and the carbon fiber layer; wherein the functional film comprises ferroelectric ceramic material with dielectric and piezoelectric response characteristics; and performing selective laser solidification on the layer area prepositioned with the multifunctional sensor unit array, so that the layer interface locally melts under the action of laser heating and embeds the multifunctional sensor unit array between adjacent layers; wherein the peak temperature of the laser heating area in the selective laser solidification process is not higher than 200 DEG C.

The application provides a silk fabric sensor and application thereof in gesture recognition, and belongs to the technical field of flexible electronics and wearable sensing. X MXene nanosheets are functional fillers, and Ti X MXene nanosheets are loaded on the surface of silk fibers through an immersion coating process to form a core-shell structure conductive fabric, and Ti X MXene and silk fibroin are stably combined through a hydrogen bond network and electrostatic interaction, the water vapor transmission rate of the sensor is more than 2000 g / m²・day, the sensitivity coefficient GF in the low strain region of 0-18% is 149.31, and the sensitivity coefficient GF in the high strain region of 18-32% is 24.57. X MXene nanosheets are functional fillers, and stable combination of MXene and silk fibers is realized through optimization of a preparation process, so that the application has high sensitivity, good air permeability and excellent fatigue resistance, and a high-precision and low-delay gesture recognition and human-computer interaction system is constructed.

This invention discloses a method for diagnosing thermal runaway in all-solid-state batteries based on displacement detection, belonging to the field of battery diagnostic technology. The method includes acquiring the structural configuration information of the all-solid-state battery cell, configuring a displacement sensor on the surface of the battery casing of the all-solid-state battery cell, monitoring the deformation of the battery casing in real time using the displacement sensor, collecting the displacement of the battery casing caused by the expansion of the thermal expansion material layer to obtain a displacement detection signal, performing signal conditioning processing on the displacement detection signal, and determining the location of the faulty battery cell that has experienced thermal runaway when the processed displacement signal value is greater than or equal to a preset displacement threshold. This solves the technical problem of slow diagnostic response caused by thermal runaway detection methods based on temperature or voltage sensors in the prior art due to delays in thermal conduction or lags in electrical changes.

The present application belongs to the technical field of solid deformation measuring equipment, in particular to a tunnel vault deformation automatic monitoring device for shield segments, which comprises a wireless sensing mechanism, the wireless sensing mechanism is used for converting and transmitting deformation values, the wireless sensing mechanism at least comprises an inductor and a sensor; further comprising a deformation transmission mechanism, the deformation transmission mechanism cooperates with the wireless sensing mechanism and the shield segment, and is used for transmitting the deformation of the shield segment to the wireless sensing mechanism, by setting the arched support frame and the elastic adapter, in the process of deformation of the shield segment, the arched support frame provides stable support, and the elastic effect of the elastic adapter makes the spring steel deformation base always adhere to the shield segment, so that the spring steel deformation base and the tunnel vault synchronously produce deformation, and finally cooperate with the wireless sensing mechanism to convert the deformation into a deformation value signal and transmit it out, so as to realize real-time monitoring of the deformation condition of the tunnel vault.