1767results about "Force measurement using piezo-electric devices" patented technology

The invention discloses a bridge pile foundation stress nondestructive testing method and system, the system comprises a sensor arrangement module, a data acquisition module, a data transmission module, a data processing module, a data analysis module, a result display and early warning module, a calibration module, a verification module and the like, sensors are various in type and high in precision, data acquisition multichannel synchronization is realized, and transmission is stable and reliable. Various technologies are used for data processing to construct a model, and a result is visually displayed and pre-warned. The system is further provided with an environment monitoring and structure health assessment module, comprehensive and accurate detection is guaranteed through an innovative formula and method, and efficient operation of the system is guaranteed through cooperative work of all modules. Through multi-module cooperation and innovative design, bridge pile foundation stress high-precision detection, environmental factor analysis and structure health assessment are achieved. Early warning can be carried out in time, bridge safety is guaranteed, a scientific basis is provided for maintenance management, and the reliability and safety of bridge operation are improved.

The invention discloses a force and acceleration composite sensor and an adjusting method, and belongs to the field of sensors. According to the technical scheme, the force and acceleration composite sensor comprises a sensor shell, an acceleration detection assembly comprises an acceleration detection core body, a first positioning face and a first pressing block are arranged in the sensor shell, the acceleration detection core body is located between the first positioning face and the first pressing block, and a screwing screw rod is arranged on the first pressing block; a first threaded hole is formed in the sensor shell, and the tightening screw is in threaded connection with the first threaded hole; the force detection assembly comprises a force detection core body, a second positioning surface and a second pressing block are further arranged in the sensor shell, the force detection core body is located between the second positioning surface and the second pressing block, and a jack assembly is arranged on the face, opposite to the force detection core body, of the second pressing block. According to the scheme, an adjustable pressing block structure is added, and adjustment of pre-pressure is achieved; and through the rigid connection mode of threaded connection, the springback phenomenon is avoided, and the pre-compression is more stable and accurate.

The invention belongs to the technical field of flexible sensors, and relates to a flexible temperature and pressure dual-mode sensor and array equipment. The temperature and pressure dual-mode sensor comprises a first flexible substrate, a force-sensitive conductive layer, an interdigital electrode layer, a second flexible substrate, a counter electrode layer and a temperature-sensitive layer which are sequentially stacked; the force-sensitive conductive layer comprises a microstructure layer stacked on the first flexible substrate and a conductive layer stacked on the microstructure layer; wherein the material of the microstructure layer comprises flexible resin and expanded microsphere powder, the interior of the microstructure layer is provided with a microsphere micropore structure formed by expansion of expanded microspheres, and the surface of the microstructure layer is provided with a plurality of protrusions and recesses; the temperature-sensitive layer is connected between the two counter electrodes of the counter electrode layer, and the temperature-sensitive layer is made of graphene.

The invention relates to the technical field of precision machining, in particular to a cutting force signal synchronous calibration method based on multi-sensor data fusion, which comprises the following steps of: 1, dynamically preprocessing acquired signals; step 2, constructing a reference time axis based on the spindle current signal, and realizing time domain alignment of multichannel signals by adopting a dynamic time warping algorithm; 3, establishing a feature incidence matrix containing a force-vibration-temperature coupling relation, and generating a fusion cutting force feature vector through frequency domain energy weight distribution; 4, a dynamic transfer function model is constructed, model parameters are updated in real time, and the fusion feature vector is mapped into a calibration cutting force signal; and 5, carrying out dynamic compensation on the calibration signal by adopting a nonlinear inverse compensation and residual modal screening strategy. According to the method, the accuracy of cutting force signals can be remarkably improved, errors and uncertainty in the machining process are reduced, and the production quality and efficiency are optimized.

The invention discloses a miniature piezoelectric driving type detection contact integrated laser module and a contact type calibration method, particularly relates to the technical field of precision measurement, is used for solving the problem of dynamic time-varying interference of high-voltage driving pulses on micro-force signals, and is an interference coupling path synchronous acquisition and dynamic resolving technology based on a distributed electromagnetic probe. Online identification of transient interference energy distribution characteristics is realized; a multi-dimensional parameter fusion mechanism of an interference-response dynamic model quantifies cross-domain characteristics of interference energy, system response and signal noise into a comprehensive suppression coefficient, and reverse compensation waveform injection and adaptive filter dynamic adjustment are performed, so that full life cycle offset of common-mode noise is realized, and damage of residual interference to closed-loop control is avoided; through cross-domain collaborative analysis of laser-mechanical data, a self-healing iteration mechanism of contact type calibration parameters is established, progressive pollution of dynamic interference to a calibration reference is eradicated, and long-term consistency of detection precision under complex working conditions is ensured.

The invention relates to a composite sensor for acceleration and pressure monitoring and a working method thereof, and belongs to the field of sensors, the composite sensor comprises an upper shell, a middle shell and a lower shell, the upper end of the upper shell is provided with an M6 mounting thread, the lower end of the upper shell is a hexagonal base, and a groove space is reserved in the inner side of the lower end of the hexagonal base; the appearance of the middle shell is a hexagonal base, and M5 mouthpiece installation holes are formed in the left side and the right side of the middle shell. A double-end beam sheet is arranged in the middle of the inner side of the middle shell and is of a sheet-shaped structure, and the two ends of the double-end beam sheet are fixedly connected with the front inner wall and the rear inner wall of the middle shell or integrally formed. The center of the double-end beam sheet is provided with an integrally connected cylindrical screw rod, and the cylindrical screw rod is provided with an acceleration sensor core body structure; the appearance of the lower shell is a hexagonal base, and a mounting groove is formed in the bottom of the lower shell and used for mounting a pressure sensor core structure; the upper shell, the middle shell and the lower shell are connected in a welded mode. The device is simple in structure, can realize synchronous monitoring of acceleration and pressure without mutual interference, and can realize multi-scene application at the same time.

The invention provides a self-powered piezoelectric capacitance sensor for dynamic and static cooperative detection and a preparation method thereof, and the sensor comprises a piezoelectric unit which is used for collecting dynamic signals and comprises a top packaging layer, an upper electrode layer, a piezoelectric layer, a lower electrode layer and a central isolation layer from top to bottom; the self-powered capacitor unit is used for collecting static or low-frequency signals and comprises a bottom packaging layer, a combined lower electrode layer, a power supply layer, a radial isolation layer, a dielectric layer and a combined upper electrode layer from bottom to top, the radial isolation layer is arranged on the outer ring of the dielectric layer, and the power supply layer is arranged on the outer ring of the radial isolation layer; and the lower surface of the central isolation layer of the piezoelectric unit is bonded with the upper surface of the combined upper electrode layer of the self-powered capacitor unit in a face-to-face manner, so that the piezoelectric unit and the self-powered capacitor unit form an integral structure. Dynamic and static load monitoring under the sole complex environment is achieved through the piezoelectric-capacitance multiple effects, power is supplied to the capacitor unit through the power supply layer, and the sensor has the advantages of being high in sensitivity, low in power consumption, good in durability and the like.

The invention discloses a self-energy-supply multi-mode sensing electronic skin based on ionic gel heterojunction array integration and a preparation method and application of the self-energy-supply multi-mode sensing electronic skin. The electronic skin adopts a multi-layer composite structure design and comprises an electrode array layer, a silver paste connecting layer, a nano material doped ionic gel array layer and a pure ionic gel continuous layer, and passive self-energized work is realized through a space ion migration effect at a heterogeneous gel interface. The method is characterized in that the design of a multi-layer flexible composite structure is adopted, space-time coded light, temperature, pressure and humidity four-mode stimulation can be synchronously converted into electroneurographic signals, and a collaborative identification strategy of response intensity dynamic range and synaptic learning / delay time difference is utilized; and high-precision decoupling of the multi-source signals is realized in combination with a classification decision tree algorithm. The electronic skin has the characteristics of flexibility, deformation, environment self-repairing and bionic synapse, and geometrical characteristics of a reconfigurable target source are fused through time-space domain multi-modal data.

The invention relates to the technical field of sensors, in particular to a bionic flexible tactile sensor and a preparation method and application thereof, and the bionic flexible tactile sensor comprises a substrate layer, an electrode layer, a PZT (at) PDMS piezoelectric sensing sensitive layer, a flexible deformation layer and a rigid pressure amplification layer which are stacked in sequence; the PZT (at) PDMS piezoelectric sensing sensitive layer comprises a plurality of strip-shaped PZT (at) PDMS piezoelectric sensing sensitive units which are arranged at intervals; the flexible deformation layer is partially embedded in a gap between the strip-shaped PZT (at) PDMS piezoelectric sensing and sensing units; the bionic flexible tactile sensor is provided with a plurality of crack units from the rigid pressure amplification layer to the PZT (at) PDMS piezoelectric sensing sensitive layer. According to the invention, a strain amplification structure in a scorpion slit receptor in nature is used for reference in structure, exoskeleton epidermis parts at two sides of a scorpion slit are rigid, and subcutaneous tissue parts and crack end parts are flexible, so that a strain concentration effect at a soft material can be realized by utilizing a hard-soft-hard structure of the slit of the biological body surface sensor; and the sensitivity of tactile signal detection is improved.

The invention provides a flexible piezoelectric sensor and a signal detection method thereof. The flexible piezoelectric sensor comprises a protective layer PDT, a second electrode layer, a flexible composite piezoelectric film layer, a first electrode layer, a flexible square polyimide substrate and a polyurethane adhesive tape. The signal detection method comprises the steps that the flexible piezoelectric sensor is attached to a human body and a sheep, the flexible piezoelectric sensor obtains signal data generated at a test position, the signal data are obtained through the processing module, signal preprocessing is carried out based on an improved filtering method, and a data set with a specific rule of effective signals is obtained. And then the information is sent to a rear end through wireless transmission, so that accurate identification of different behaviors is realized. The invention has the advantages of simple preparation process, small size, good flexibility, convenience in use, stable performance and the like, and can realize detection of heartbeat, respiration and other signals of human bodies and animals in a complex environment.

The invention provides a fiber reinforced structure damage positioning method based on a piezoelectric effect, a fiber reinforced structure is widely applied in multiple fields but is easy to damage, an existing positioning method has defects, and the method comprises the steps of piezoelectric composite material preparation, sensor network construction, signal acquisition and processing, positioning based on a time reversal method and the like. During preparation, specific materials are mixed and stirred and then laid with the reinforced fibers, and the processes of curing molding, polarization, packaging and the like are performed; the sensing network is formed by arranging electrodes on the surface of the composite material; signal acquisition is carried out when the composite material deforms or is damaged under load; and the positioning is to re-excite the acquired signal after time reversal processing, and determine a damage point according to a focusing position. The method has the advantages of high-precision positioning, self-energized real-time monitoring, wide applicability, simple and practical structure and the like, can be applied to various fiber reinforced structures, can effectively solve the problems in the prior art, and has important significance for guaranteeing the safety and reliability of the fiber reinforced structures.

The invention provides a bionic flexible force sensor based on a tenon-and-mortise structure and a high-performance medical patch material, belongs to the technical field of biomedical engineering, and can be used for multiple organ tissues such as myocardium and skin. The bionic flexible force sensor is provided with an upper base and a lower base; the upper base and the lower base are of a concave-convex interlocking tenon-and-mortise structure. A plurality of convex tenons are designed on the bottom surface of the upper base, a plurality of concave mortises corresponding to the tenons are designed on the top surface of the lower base, and the tenons and the mortises are precisely matched to form stable locking; the tenons and the mortises are connected through buckle structures, and sliding and loosening are prevented. The bionic flexible force sensor is integrated and fixed on the surface or inside the medical patch through a micro-adhesion technology. A renewable wood-based enhanced visible light 3D printing technology is adopted, and nanofibers, nanocrystals and composite nanoparticles are combined, so that the patch material has excellent mechanical properties, electrical conductivity and drug controlled release property.

The invention discloses a motion estimation method and device based on multi-modal perception and electronic equipment, and relates to the technical field of intelligent technology, in particular to the technical field of motion estimation based on multi-modal perception. According to the specific implementation scheme, motion evaluation related data, including I MU sensor data and flexible deformation sensor data, of a target part area of a target object are obtained, and pose information of a part configured with an I MU sensor can be determined based on the I MU sensor data; and according to the position relationship between the configured I MU sensor and the flexible deformation sensor and the acquired data of the flexible deformation sensor, the pose information of the position where the flexible deformation sensor is configured is calculated, so that the pose information of the position where the I MU sensor is not configured is obtained under the condition that the configuration of the I MU sensor is limited.

The invention relates to the technical field of sensors, in particular to a three-electrode sensor integrating positioning and pressure detection and a manufacturing method thereof, and the three-electrode sensor comprises a resistor positioning unit, a gasket, a piezoelectric unit and a packaging layer which are connected in sequence; wherein the resistor positioning unit is used for detecting a stressed position; the upper parts of the two gaskets are respectively connected to the edge of the resistor positioning unit, and the lower parts of the two gaskets are respectively connected to the edge of the piezoelectric unit, so that the resistor positioning unit and the piezoelectric unit form a cavity structure; the piezoelectric unit is used for detecting the magnitude of stress; the sensor can collect the pressure position and the pressure magnitude at the same time, has the advantages of being simple in structure, independent in signal and stable in performance, and has great application potential in multiple frontier fields such as flexible sensing, medical instruments and robot grabbing.

The invention relates to the technical field of flexible piezoelectric sensors, and discloses a wide-working-condition multi-dimensional force representation flexible film piezoelectric sensor and a signal analysis method, after a pvdf piezoelectric film is cut in a paper-cut mode, regionalized electrode coating and covering are carried out, and multi-channel signal output is achieved. Therefore, characterization of multi-dimensional force can be realized on one film sensor, and meanwhile, the tension and conformal capability of the sensor are enhanced through the paper-cut design, so that the attachment requirement of a complex surface is met. A multi-layer composite structure is combined and comprises a flexible polymer protection layer and a flexible connection layer, and high sensitivity, excellent tensile property and mechanical durability are achieved through hot pressing and local ultrasonic welding. The sensing capability is enhanced, and the defect of poor tensile property of a traditional PVDF piezoelectric sensor is overcome. The preparation method is simple in process, low in cost and suitable for large-scale industrial production. In addition, the invention provides a deep learning analysis method for multi-channel signals, and classification and nonlinear fitting can be realized.

The invention relates to the technical field of fault detection, in particular to a high-voltage connector loosening fault detection method and device and an automobile, and the method comprises the following steps: forming a surface acoustic wave resonator array based on an interdigital transducer array, an acoustic wave resonator and a flexible waveguide; butting a signal source radio frequency cable with the pin interdigital electrode chip, triggering data acquisition, performing Fourier transform on original data, and judging the loosening risk of the connector according to each parameter threshold value; carrying out three-dimensional modeling on the connector plugging interface, carrying out modal analysis on the model, and obtaining surface acoustic wave frequencies, group velocities and phase distribution under different pre-tightening forces so as to identify a contact force abnormal region; based on a multi-stage early warning mechanism, rapid locking is achieved through electrorheological fluid, and displacement is finely adjusted through a magnetostrictive rod. According to the invention, the loosening hidden danger can be quickly and accurately locked, a tight protection system is constructed by multi-stage early warning and mechanical self-locking, and the loosening risk of the high-voltage connector can be greatly reduced from early warning to active intervention.

The invention discloses a method for preparing a flexible electrode layer by using laser-induced graphene and the flexible electrode layer. The method comprises the following steps: preparing a laser-induced graphene pattern on the surface of a polymer by using a carbon dioxide laser; and coating flexible photosensitive resin on the surface of the polymer with the laser-induced graphene pattern, carrying out ultraviolet curing, and peeling off the cured flexible photosensitive resin and the laser-induced graphene pattern from the polymer film to obtain the LIGG and flexible photosensitive resin double-layer structure. The graphene pattern induced by laser is quickly, simply and conveniently transferred to the flexible photosensitive resin substrate by adopting an ultraviolet curing method, and the flexible electrode layer which can be bent, can be patterned, has excellent conductivity and is provided with the LIGG and flexible photosensitive resin layer structure is obtained.

The invention provides a battery detection device, a battery module and a battery system detection method. The battery detection device comprises a rigid part, a piezoelectric detection assembly and a control part, the rigid part is suitable for being arranged on the battery cell module in a sleeving mode and attached to the outer wall face of the battery cell module, the piezoelectric detection assembly is attached to the side, away from the battery cell module, of the rigid part, and the control part is electrically connected with the piezoelectric detection assembly. And the control part is configured to determine the state of the battery cell module based on the output voltage data of the piezoelectric detection assembly. According to the battery detection device, the detection of the battery cell module can be realized without a large number of detection sensors, and the detection complexity and the detection cost of the battery cell module are reduced. And a detection element does not need to be arranged in the battery cell module, so that the damage to the mechanical boundary condition of the module is avoided, and the test error caused by the damage to the mechanical boundary condition of the battery cell module can be effectively avoided.

The invention discloses an implantable passive pressure sensor and a preparation method thereof. The passive pressure sensor comprises electrode layers, a dielectric layer clamped between the electrode layers and a packaging layer wrapping the electrode layers, the electrode layers are coils made of patterned conductor materials, and the dielectric layer and the packaging layer are both made of silk fibroin films; the method comprises the following steps: dissolving degummed silk in a halide salt-formic acid solution to obtain a regenerated silk fibroin solution, curing the regenerated silk fibroin solution at room temperature to form a silk fibroin gel film, then freeze-drying the silk fibroin gel film to obtain a porous silk fibroin film, and preparing a dielectric layer and a packaging layer by using the porous silk fibroin film. And packaging the patterned conductor material between the dielectric layer and the packaging layer. The silk fibroin is used for preparing the sensing device, the overall degradation rate of the device can be more conveniently regulated and controlled, synchronous degradation of all parts of the device is ensured, short-term monitoring of pressure sensing is achieved, and secondary taking-out operation is not needed after implantation.

A piezoelectric sensor is provided. The piezoelectric sensor comprises a first base, a first conductive layer adjacent to the first base, a second base, a second conductive layer adjacent to the second base; and a first structure between the first conductive layer and the second conductive layer. The first structure comprises a first layer with a first carbon-based material and a plurality of second structures with piezoelectricity. Each of the plurality of second structures comprises a second layer with a second carbon-based material and a third layer adjacent to the second layer. The third layer comprises a material of two-dimensional crystals of unconventional stoichiometries such as Na2Cl crystals.

The invention relates to a bioelectronic surgical suture for suture tension monitoring, the surgical suture comprises a cannula and a conductive material, the cannula is a hollow capillary tube, and the conductive material is arranged in the cannula through perfusion and is subjected to first laser scanning treatment after perfusion; a micro-nano structure is manufactured on the outer wall of the sleeve through second laser scanning. According to the principle of friction nanometer power generation, the tension of the surgical suture causes the change of the contact area between the suture and tissue and the change of an output electric signal in the collection process, the tension of the surgical suture can be reversely deduced, and the purpose of monitoring the surgical suture tension is achieved. The operation line is a self-powered sensor, and an external power supply is not needed. The operation line can provide different quantitative feedbacks according to different suturing modes and suturing parts, and is combined with clinical suturing experience of doctors to assist in establishing a tension quantitative model, so that the doctors are helped to optimize operation procedures, postoperative complications are reduced, and wound healing is promoted.

The invention specifically relates to a pressure sensor comprising a seat body, one end of which is provided with an inner cavity defining an opening and a pressure introduction channel extending from the other end to be communicated with the inner cavity; the pressure measuring assembly is arranged in the inner cavity; the annular electric contact element is arranged in the inner cavity, the electric contact element comprises a plurality of independent electric contact parts arranged on the inner wall or the outer wall of the electric contact element, and each electric contact part is electrically connected to the pressure measuring assembly; one end of the end button is screwed into the upper end of the opening of the inner cavity in a screw-thread fit manner; and the plurality of terminals are fixed on the end button, one end of the inner side of each terminal extends into the inner cavity, and at least in a final state in a screwing process, the inner side of each terminal is correspondingly and electrically contacted with each matched electric contact part. The device at least has the advantages of small size, compact and reasonable structure and the like.

The invention discloses a preparation method of a piezoelectric self-sterilization cotton fabric-based pressure sensor. The preparation method specifically comprises the following steps: step 1, preparing a modified boron nitride nanosheet; step 2, preparing a modified boron nitride nanosheet / Ag-MOF545 composite material; step 3, preparing a modified boron nitride nanosheet / Ag-MOF545 cotton fabric based piezoelectric material; and 4, preparing the self-sterilization cotton fabric based piezoelectric pressure sensor. According to the piezoelectric self-sterilization cotton fabric-based pressure sensor, on the basis of a piezoelectric polarization effect generated by a piezoelectric material, a stimulation signal of external strain is converted into a piezoelectric current signal to be output, and molecular electrolysis is generated on the surfaces of bacterial cells by utilizing the current signal; meanwhile, the electroporation effect generated by the current can destroy the integrity of a bacterial membrane and induce metabolism disorder of bacteria, and as a physical method, due to the fact that no additional antibacterial material needs to be loaded and the broad-spectrum antibacterial effect is achieved, the bacteria can be thoroughly killed while the drug resistance of the bacteria is effectively avoided.

The invention relates to the technical field of electrical variable measurement, in particular to a multi-dimensional force measurement device giving consideration to static measurement and dynamic measurement, and solves the technical problems that a traditional six-dimensional force sensor is complex and tedious in structure, relatively heavy in overall weight, incapable of giving consideration to static measurement and dynamic measurement and relatively low in measurement precision, and the multi-dimensional force measurement device comprises a measurement assembly and a vibration isolation assembly; the measuring assembly comprises a bottom plate, a top plate and a cantilever beam; the cantilever beam is connected to the bottom plate, the cantilever beam is clamped into a limiting groove of the top plate through a supporting arm, and a uniaxial strain gauge, a first biaxial strain gauge, a second biaxial strain gauge, an X-type piezoelectric crystal, a first Y-type piezoelectric crystal and a second Y-type piezoelectric crystal are arranged on the cantilever beam; the vibration isolation assembly comprises a first horizontal supporting plate, a second horizontal supporting plate, multiple layers of isolation sleeves and supporting columns, and an interlayer between every two adjacent isolation sleeves is filled with an elastic material. The device realizes the combination of static measurement and dynamic measurement, and can capture quickly changing torque and force while keeping high precision.

The embodiment of the invention discloses a flexible piezoelectric sensor packaged by a fish scale microstructure elastomer and a preparation method thereof, the flexible piezoelectric sensor is provided with a flexible main body structure, the flexible main body structure comprises a first packaging layer, a piezoelectric layer, an electrode layer and a second packaging layer, the central area of the first packaging layer is provided with a rectangular notch, and the piezoelectric layer is arranged in the rectangular notch; a rectangular notch is formed in the first packaging layer, an elastomer packaging layer covers the rectangular notch, the elastomer packaging layer comprises a substrate and a fish scale microstructure, and the stress distribution effect of the elastomer packaging layer is optimized through the fish scale microstructure, so that the composite packaging structure of the first packaging layer and the elastomer packaging layer can guide stress to be concentrated in a specific area; the flexible piezoelectric sensor has the advantages that the flexible piezoelectric sensor is provided with the fish scale microstructure, local strain capacity is enhanced, energy dissipation is reduced, the fish scale microstructure comprises a plurality of fish scale microstructure units, the fish scale microstructure units are arranged in an array mode, and sensitivity and response speed of the flexible piezoelectric sensor under the low-pressure or low-frequency condition are further improved.

The invention discloses a ground wire system, and relates to the technical field of power system safety equipment, and the system comprises a conductive wire clamp assembly which can clamp a ground wire, and a pressure sensor is arranged at the clamping position, and can collect the pressure change of the clamping moment of the ground wire; the placement bin is connected to one end of the conductive wire clamp assembly, a circuit board is arranged in the placement bin, and a single-chip microcomputer, a 4G wireless communication module and an attitude sensor are carried on the circuit board; the attitude sensor can measure attitude information of the grounding wire; the single-chip microcomputer is electrically connected with the pressure sensor and the attitude sensor and can receive pressure and attitude data, and the 4G wireless communication module can upload the collected pressure and attitude data to a cloud server in real time by using a mobile communication network. According to the invention, the hitching state and hitching posture of the grounding wire can be judged in real time.

The invention discloses a displacement monitoring system in underground engineering construction and a monitoring method thereof. According to the system, millimeter-level earth surface deformation is captured in real time through a high-precision GNSS displacement monitoring network, and a sensing-decision-execution closed-loop control system is formed in combination with a three-dimensional pressure sensing array and a dynamic execution mechanism of the intelligent pressure regulating module. And when monitoring that the stress of the supporting structure is unbalanced or the displacement of the surrounding rock is abnormal, the intelligent decision center can generate a pressure regulating strategy within 200 milliseconds to drive the hydraulic servo system and the pneumatic compensation unit to implement accurate pressure correction, so that the displacement expansion trend is effectively inhibited. According to the real-time dynamic balance mechanism, traditional passive early warning is upgraded into active intervention, the sudden collapse risk is reduced by about 60%, and meanwhile material waste caused by excessive supporting is reduced.

The invention provides a piezoelectric resonant sensor and a preparation method thereof, and relates to the technical field of sensors and sensor manufacturing. The piezoelectric resonant sensor comprises a substrate and a piezoelectric component. Wherein the substrate is provided with a first side and a second side which are opposite to each other, and an input cavity is formed in the second side; the piezoelectric assembly is connected to the first side of the substrate, one side, facing the substrate, of part of the piezoelectric assembly protrudes in the direction away from the substrate and is matched with the substrate to form a resonant cavity, and the resonant cavity is at least partially opposite to the input cavity. A pressure sensitive film is formed on the part, opposite to the input cavity, of the substrate, and the input cavity is used for receiving to-be-detected pressure and transmitting the to-be-detected pressure to the pressure sensitive film, so that the pressure sensitive film drives the piezoelectric assembly to deform through the cavity wall of the resonant cavity. Therefore, a resonant cavity is naturally formed between the piezoelectric component and the substrate, and an additional middle layer can be avoided, so that the size of the piezoelectric resonant sensor can be reduced, the cost is reduced, and large-scale production is facilitated.

The invention relates to the technical field of sensor sensing, in particular to a self-power-generation sensing sensor, a mechanical claw and a mechanical claw clamping force sensing method.The self-power-generation sensing sensor comprises an elastic body, a first friction electrode, a second friction electrode and a multi-channel data acquisition board, and an inner mounting cavity is formed in the elastic body; the first friction electrode and the second friction electrode are oppositely arranged and located in the internal mounting cavity, a negative electrode welding point is formed on the first friction electrode, and a positive electrode welding point is formed on the second friction electrode; and the multi-channel data acquisition board is respectively connected with the cathode welding point and the anode welding point through wires. The flexible triboelectric sensor is formed by the elastic body, the first friction electrode, the second friction electrode and the multi-channel data acquisition board, is not limited by own stretchability, is simple in structure, does not need an external power supply, realizes pressure monitoring of self-power generation, and expands the use scene of the sensor.

A roller for a web processing machine, wherein the roller comprises a roller cylinder having a cylindrical roller core, a roller covering surrounding the roller core, and a lateral surface, wherein the roller covering consists of one or more roller covering layers in the radial direction and contains sensors, characterized in that an electrically conductive shield is arranged in the radial direction between the sensors and the lateral surface; a web processing machine comprising the sensor roller and a counter roller arranged parallel to the sensor roller with an intermediate treatment gap, wherein each of the sensors of the sensor roller can detect the pressure exerted on the sensor roller when passing through the treatment gap.