617results about "Force measurement using piezo-electric devices" patented technology

The invention discloses an automatic system for brake spring force detection, which relates to the technical field of mechanical engineering and automatic control, and is characterized in that a multi-physics field coupling measurement module adopts a nested force sensor group (a strain gauge and piezoelectric quartz compound) and non-contact displacement measurement, and is combined with a thermal expansion compensation ring to correct temperature influence in real time; the environmental interference suppression module eliminates electromagnetic and thermal interference through an electromagnetic shielding cavity and a temperature control platform; the dynamic error compensation engine realizes drift prediction and physical field fusion by using six-dimensional attitude sensing and edge calculation (LSTM + GPR double-stage model); the self-calibration executing mechanism completes nanoscale positioning and micro-force control based on air flotation driving and the bionic clamping jaw. The method solves the problem of measurement misalignment caused by environmental interference, material thermal deformation and clamping errors in traditional detection, and is suitable for high-precision spring force detection under complex working conditions.

The invention discloses a centripetal force sensor and a using method thereof, and belongs to the field of sensors. According to the technical scheme, the centripetal force sensor comprises a fixed part and a rotating part, the rotating part comprises a sensor shell, the sensor shell is hollow, a center signal column is fixedly installed in an inner cavity of the sensor shell, a plurality of notches are formed in the outer circumferential face of the center signal column, and mass blocks are placed in the notches; piezoelectric ceramics are arranged on the outer side of the mass block, and the piezoelectric ceramics and the mass block are clamped between the inner wall of the sensor shell and the outer wall of the center signal column. The sensor is directly installed at the rotation center of a detected object, additional centrifugal force generated by the mass of the sensor approaches to zero, the authenticity of the detection result is greatly improved, meanwhile, the sensor is in direct conductive contact with the signal output structure through the center signal column, the mouthpiece does not rotate along with the detected object, and the detection accuracy is improved. The winding and pulling faults of the mouthpiece and an external pipeline are completely eradicated, and the durability of the sensor is improved.

A force sensor comprising a contact arrangement for transmitting a contact force to a force sensor assembly. The force sensor assembly comprising a first sensor sensing, and producing an output from, a normal contact force component of the contact force; and a body moveable on transmission of the contact force to the force sensor assembly; and a second sensor for sensing, and producing an output from, a relative displacement of the body relative to the second sensor, the a tri-axis contact force being determined from the relative displacement.

The invention relates to the technical field of stress monitoring, in particular to a piezoelectric ceramic system for stress monitoring, which comprises a distributed sensing network module, a stress signal processing module, a stress feature extraction module, an intelligent positioning module and a monitoring feedback module. Mechanical stress is converted into charge signals through a piezoelectric ceramic sensor array and a sensor group, spectrum correlation cross validation is carried out on multiple paths of signals through high-fidelity conditioning and digital processing, and abnormal data are effectively eliminated; vibration mode characteristics are extracted through collaborative time-frequency domain analysis, and damage risk parameters are calculated to distinguish damage types; the intelligent positioning module determines a damage area and endows different confidence levels with the damage area in combination with a sensor spatial topological relation and an abnormal association mode; and the monitoring feedback module executes graded early warning. According to the method, the reliability of monitoring data, the sensitivity of early damage identification and the accuracy of damage positioning are remarkably improved, and intelligent graded early warning based on risk confidence is realized.

The invention provides a high-precision force sensor chip packaging structure and a detection method, and the structure comprises a ceramic pedestal, the top end of the ceramic pedestal is provided with a first accommodation groove, the lower part of the first accommodation groove is provided with a second accommodation groove, the second accommodation groove is communicated with the first accommodation groove, the connection part of the first accommodation groove and the second accommodation groove forms an accommodation area, and the first accommodation groove and the second accommodation groove are communicated with each other. A plurality of internal electrodes are arranged in the accommodating area; one end of the crystal chip in the length direction is fixed in the accommodating area, the other end of the crystal chip is suspended, a chip electrode is arranged at the top end of the crystal chip, and an electrode pin of the chip electrode is electrically connected with each internal electrode; the metal sealing ring is arranged at the top end of the ceramic base; the upper cover covers the top end of the metal sealing ring; and the plurality of external electrodes are arranged on the outer side wall of the ceramic base at intervals. The chip packaging structure has the advantages that external force can be effectively transmitted into the oscillation area on the chip, the chip and the packaging structure both have high force frequency coefficients, dynamic and static conditions are detected at the same time, and the high-precision effect of mechanical detection is achieved.

The invention relates to the technical field of flexible sensing, in particular to a multi-stage pressure sensor for unconstrained monitoring and a preparation method thereof.The multi-stage pressure sensor comprises a flexible substrate, the flexible substrate comprises an upper-layer fabric and a lower-layer fabric which are arranged in a spaced mode, and the upper-layer fabric and the lower-layer fabric are connected through connecting wires; the static supporting unit comprises a plurality of supporting columns which are arranged in an array mode and fixed to the flexible substrate, and the height of the supporting columns is configured to be larger than the thickness of the flexible substrate; the flexible sensing unit is adjacently arranged on the periphery of the static supporting unit and comprises a conductive wire arranged on a flexible substrate, and the conductive wire and a connecting wire form a triboelectric sensing unit; the rigidity of the static supporting unit is larger than that of the flexible sensing unit. The purpose of the present invention is to improve response sensitivity to weak dynamic signals.

The invention discloses a passive gasket type pressure sensor based on parametric negative resistance self-excitation and a monitoring method, and belongs to the technical field of bolt loosening state monitoring. The sensor is improved based on a standard metal flat washer, a piezoelectric sensing unit, a pilot frequency response passive network and a passive heat-induced drift suppression circuit are embedded, and an embedding area is filled with organic silica gel. The pilot frequency response passive network uses parametric reactance to modulate nuclear strength nonlinearity to generate active negative resistance, weak radio frequency energy self-excitation is achieved, and bolt axial load change is mapped into echo frequency sideband drift; the thermally induced drift suppression circuit eliminates temperature drift. According to monitoring, the environment temperature is determined through temperature echoes, a frequency-load curve is matched, and then the bolt loosening state is determined through bolt loosening state echoes. Passive, wireless, maintenance-free and high-precision monitoring is realized, and the problems of high starting threshold, near communication, poor integration and the like in the prior art are solved.

The invention discloses a deicing device and a deicing method for deicing an iced line. Deicing of the iced line is completed under the synergistic effect of an opposite clamping mechanism, an electromagnetic oscillation system, a direction controller and a clamping driving mechanism. The deicing efficiency and safety are improved through cooperation of electromagnetic multidirectional oscillation and intelligent control, multidirectional impact is achieved under driving of switching current of a direction controller by means of oscillation cavities and ferromagnetic small balls arranged in a left clamping plate and a right clamping plate, ice layer stress weak areas are monitored in real time in combination with a piezoelectric sensor, accurate directional deicing can be achieved, and the deicing efficiency and safety are improved. The problem of insufficient dead angle coverage is avoided; a hydraulic push rod and connecting rod structure ensures stable opening and closing of clamping and adapts to different line diameters, a multi-direction covering deicing process is simplified through a switch integrated with a handheld rod, the frequency is optimized through dynamic regulation and control to adapt to ice thickness changes, finally, deicing energy consumption is remarkably reduced, deicing time is remarkably shortened, and meanwhile the risk that an ice layer is broken and splashed is reduced.

The invention relates to the technical field of signal detection and acquisition. The invention provides a pulse signal acquisition device based on a solid-liquid coupling structure. The pulse signal acquisition device comprises a shell, a flexible film and a pressure sensor, the shell is of a hollow structure, and an opening is formed in the lower end of the shell; the flexible film is arranged at the lower end of the shell and extends outwards from the opening; the shell and the flexible film form a sealed cavity, and the sealed cavity is filled with a liquid medium; the pressure sensor is arranged at the upper end of the shell and makes contact with the liquid medium. A sensing coupling interface is constructed through the flexible film and the liquid medium, a continuous compliant solid-liquid contact path is formed, and the problems of energy reflection and signal attenuation caused by mismatching of mechanical impedance of a traditional rigid structure sensor are solved. According to the pulse signal acquisition device, impedance natural transition and pressure wave stable conduction between the skin and the sensor are achieved, and the coupling efficiency and acquisition sensitivity of the pulse signal acquisition device are improved.

The invention discloses an intelligent road disease detection method and system based on a large model, and relates to the technical field of road maintenance engineering.The system collects road state data in real time through path planning and sensor group arrangement and transmits the data to an intelligent road disease detection system for data processing; forming a structure response data set and a vehicle load data set, calculating a periodic vibration accumulation index cap through the structure response data set to perform road state evaluation, executing an impact promotion analysis instruction when an evaluation result is a normal state, calculating an excitation fatigue response index sho through the vehicle load data set, road structure evolution evaluation is carried out in combination with the crack evolution kinetic potential index CEP obtained through calculation, and an optimization instruction is generated according to a road structure evolution evaluation result. According to the invention, full-period dynamic monitoring and intelligent decision making of road diseases are realized, the road fatigue and crack expansion trend can be identified in advance, the maintenance strategy is optimized, and the road use safety and management efficiency are improved.

The invention relates to a pressure distribution identification and detection system and method based on a time sequence convolutional neural network. According to the system, a pressure sensor array is used for collecting pressure signals, after filtering processing, the pressure signals are input into a time sequence convolutional neural network for feature extraction and mode recognition, and high-precision pressure distribution detection and recognition are achieved. The method is particularly suitable for anti-interference input equipment under the scenes of man-machine interaction, electronic signature authentication and the like.

The invention belongs to the technical field of superconducting materials, and discloses an internal tin method Nb3Sn superconducting wire integrated with a piezoelectric sensing function and a preparation method of the internal tin method Nb3Sn superconducting wire. According to the method, a piezoelectric functional layer and a dielectric layer are prepared on the surface of a SnAl alloy rod, a CuAg alloy rod is installed after drilling to form a composite rod, the composite rod is inserted into an inner tin method Nb3Sn / CuNb composite pipe to be drawn into a subcomponent, then the subcomponent is bundled and installed into a Ta pipe and an oxygen-free copper pipe, and the wire is prepared through multiple times of stretching. The piezoelectric functional layer can convert micro strain into measurable electric signals, in-situ real-time monitoring of mechanical stress and the like in the wire rod is achieved, the CuAg alloy bar can stabilize the tensile strength of the wire rod and promote generation of an Nb3Sn phase, and on the premise that the superconducting performance is not affected, the operation reliability and safety of the high-field magnet under the extreme working condition are improved.

The invention relates to the technical field of intelligent monitoring, and particularly discloses a built-in drilling machining axial force monitoring method and system.The method comprises the steps that multi-channel original force signals are synchronously collected through a plurality of annular piezoelectric type force sensors connected with a spindle mounting bolt in series, and filtering, normalization and abnormity elimination preprocessing are conducted on the multi-channel original force signals; the method comprises the following steps: eliminating abnormal data by adopting consistency verification, dynamically distributing weights in combination with historical reliability of a sensor, performing fusion calculation on a total axial force value, dynamically setting a self-adaptive early warning threshold value based on learning samples of first 10 holes, performing real-time optimization, analyzing reading distribution uniformity and pre-tightening force deviation of the sensor, and identifying an eccentric load and bolt abnormality. Through closed-loop control of a standard interface and a machine tool numerical control system, machining parameters are adjusted in a graded mode or sudden stop is triggered. According to the method, the axial force monitoring precision and the anti-interference capability are improved, the early warning false alarm and missing alarm rate is reduced, the equipment health diagnosis function is expanded, the machining quality and the equipment safety are guaranteed, and the method is suitable for high-end equipment drilling machining scenes.

Inconclusive and inconsistent results from existing haptic testing systems, e.g. for trackpads, which include rigidly mounted resistive load cells and accelerometers, prevent accurate results, especially in a high-volume production context. The use of a rigidly mounted sensor is unsuitable because a trackpad will generally be softer than the actuation system, whereby, when the haptic event is fired, the vast majority of the energy will be lost in the trackpad, while the sensor remains almost stationary. Accordingly, an improved test probe for a haptic device configured for mounting on a robotic arm, comprises: a contact tip configured for contacting the haptic device; a sensor configured for measuring a threshold force of the piezoelectric actuator device, and an haptic characteristic, e.g. acceleration, of a resulting haptic response thereof at a same time and a same location; and a compliant element configured for enabling the sensor to move relative to the haptic device.

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 discloses a PVDF (Polyvinylidene Fluoride)-coated TPU (Thermoplastic Polyurethane) fiber membrane as well as a preparation method and application thereof. The PVDF-coated TPU fiber membrane has a core-shell structure formed by taking TPU as a core and PVDF (Polyvinylidene Fluoride) as a shell layer. A coaxial spinning technology is adopted, TPU is coated with a PVDF fiber membrane to form a core-shell structure, and the stretchability of the composite fiber membrane is greatly improved on the premise that the piezoelectric property of the composite fiber membrane is not reduced; the interfaces of the core layer spinning solution and the shell layer spinning solution are mutually diffused, so that the matching property and the bonding property of the material are improved, the interface enhancement effect is improved, and the piezoelectric property of the composite material is further improved; a template or a nucleation site is formed on the surface of the core TPU, PVDF crystallization is induced, generation of more regular or more beta-phase regions by PVDF is facilitated, and the piezoelectric property of the PVDF film is further improved; the piezoelectric property and the tensile property are improved, so that the composite material has a wide application prospect in the fields of wearable devices, efficient filtering materials, biology, medicines and the like.

The invention discloses a derrick rotation supporting mechanism overturning monitoring system with a remote monitoring function, and relates to the technical field of remote monitoring, and the derrick rotation supporting mechanism overturning monitoring system comprises the following steps: acquiring vibration acceleration and bolt pre-tightening force data, and performing spectrum analysis to obtain a resonance coefficient so as to judge a resonance state; and an overturning coefficient is calculated according to the bolt pre-tightening force time sequence change, so that overturning risk prediction and early warning are realized, and safe operation of a mechanism is guaranteed. Resonance risks are monitored in real time through vibration spectrum analysis, bolt pre-tightening force attenuation and structural fatigue are effectively prevented, the active protection capacity of a system is improved, overturning risks are dynamically evaluated based on bolt pre-tightening force time sequence changes, the chain loosening effect is accurately recognized, overturning advanced early warning is achieved, and the safety and reliability of a mechanism under the complex working condition are enhanced.

The invention discloses a use method of a dynamic balance device containing a core engine unit bearing mechanism, which comprises the following steps: S1, constructing a simulation support environment: at a final assembly station, assembling a rear bearing for supporting a rotor and a split type detection bearing seat tool outside a cartridge receiver into a rigid module; s2, system integration and sensing coupling: loading a rotor system into a casing; s3, in-situ balance debugging; s4, tool conversion and state curing; the invention belongs to the technical field of manufacturing and assembling of aero-engines and gas turbines, and achieves the technical effects that a detection bearing seat tool which is provided with a mounting interface and an internal cavity structure which are completely the same as those of a formal bearing seat tool is adopted; the mechanical supporting environment of the rotor in the balance test is ensured to be completely consistent with the real working environment, so that the perfect balance state debugged in the test state can be kept without damage and completely after a formal tool is replaced, and the error source is reduced.

The invention discloses an intelligent mine disaster early warning device and system, and the device comprises a multi-mode sensing array which comprises a bionic mine pressure sensor group, a gas spectrum fingerprint recognition module, and a micro-seismic beam forming array; the adaptive communication network comprises an edge preprocessing unit and a dual-mode communication module; and the dynamic risk assessment server is configured with a spatial-temporal feature fusion neural network and a threshold evolution engine. According to the invention, three-dimensional reconstruction of a stress field is realized through a tree-shaped groove substrate of the bionic mine pressure sensor group and a three-dimensional piezoelectric network, and a multi-mode sensing system covering stress, gas and slight shock is formed in combination with wide-spectrum gas fingerprint identification of the micro Fourier infrared spectrometer and the electrochemical sensor group. The spatial resolution and the gas type recognition coverage rate can be remarkably improved, dynamic correlation analysis of cross-modal data is achieved through the spatio-temporal feature fusion neural network, the disaster precursor feature capture sensitivity can be effectively improved, and the false alarm rate can be effectively reduced.

Braking device for a vehicle, with a piezoelectric sensor (2) comprising: a piezoelectric material, two electrodes (6, 7), wherein the piezoelectric material comprises a first flat face (4) and a second flat face (5), the faces extending in parallel planes identified by two orthogonal y and z directions, wherein an electrical signal is collected by the electrodes when the piezoelectric material is simultaneously subjected to a normal force in an x-direction and to a shear force in the z-direction, wherein the first electrode is positioned on the first face and the second electrode is positioned on the second face and has extensions (7a, 7b) on the first face separated by the first electrode, wherein each of said extensions extends on a corresponding side of said first face, and wherein each of said extensions is symmetrically configured with respect to a central axis of the first face.

The invention discloses a coplanar parallel capacitance-piezoelectric multi-mode tactile sensor and a preparation method thereof. The coplanar parallel capacitance-piezoelectric multi-mode tactile sensor comprises a substrate, a lower electrode, a middle functional layer, an upper electrode and a packaging protection layer which are sequentially arranged from bottom to top, the middle functional layer is a high-molecular polyvinylidene fluoride (PVDF) polymer film layer; the middle functional layer is divided into a capacitance functional area and a piezoelectric functional area which are coplanar and parallel, the piezoelectric functional area is located in the middle area of the polymer film layer, and the capacitance functional area surrounds the periphery of the piezoelectric functional area; the packaging protection layer is arranged at the top of the upper electrode; different functional areas of a capacitance functional area and a piezoelectric functional area are arranged on the same film layer surface, so that a capacitance dielectric film layer and a piezoelectric functional film layer are designed to be the same film layer, in combination with an in-situ plasma polarization process, directional high-voltage polarization processing is carried out on film surfaces of different areas of the same film layer, the overall thickness of the sensor after packaging can be effectively reduced, and the packaging cost is reduced. The sensor precision is improved.

The invention discloses a waterproof and pressure-resistant acceleration impact sensor, and relates to the technical field of impact detection, the waterproof and pressure-resistant acceleration impact sensor comprises a base, the bottom of the base is provided with a mounting screw groove, the top of the base is fixedly provided with a supporting stud, the outer ring of the supporting stud is sleeved with an inner protective shell in a threaded manner, and the inner protective shell is internally provided with a sensitive element. The device comprises an inner protective shell, the outer side of the inner protective shell is wrapped with an outer protective shell in a protective mode, a buffer reset mechanism is installed at the top of the outer protective shell, and an outer ring damping mechanism is installed in the buffer reset mechanism. The waterproof sealing performance, the impact resistance and pressure resistance and the signal transmission stability are remarkably improved, the problems that a traditional sensor is prone to leakage, signal distortion and connection looseness in extreme environments such as underwater explosion are effectively solved, and the sensor is suitable for complex application scenes such as wide temperature and high-frequency impact.

This aerosol generation device comprises: a cavity housing providing a cavity for accommodating at least a portion of an aerosol generation article; an insertion detection sensor of which at least a portion is disposed to protrude into the cavity, and which detects, using a piezoelectric pressure method, the pressure applied by pressing of the protruding portion through contact with the aerosol generation article when the aerosol generation article is inserted into the cavity housing; and a control unit for determining, on the basis of the intensity of the detected pressure, whether the aerosol generation article is inserted into the aerosol generation device.

The application relates to the technical field of intelligent auxiliary reminding, in particular to an auxiliary reminding method based on a smart wearable device, which comprises the following steps: collecting behavior data of the elderly through a multi-view camera, an infrared sensor and a pressure sensing device, constructing a four-dimensional characteristic behavior sequence graph, and using a deep learning model with a multi-modal fusion and attention enhancement mechanism to analyze behavior semantics and generate graded reminding instructions. The application can accurately monitor the daily behavior of the elderly, dynamically adjust the reminding strategy, trigger an emergency alarm in an abnormal situation and record intervention logs, and effectively improve the life safety of the elderly and the monitoring efficiency.

Embodiments of the present application relate to a semiconductor device and packaging structure with stress change compensation control. The semiconductor device packaging structure comprises: a packaging shell for packaging a semiconductor chip in the packaging shell; a pressure sensitive layer arranged on the upper surface and / or lower surface of the semiconductor chip; the pressure sensitive layer senses the stress change of the semiconductor chip caused by temperature change and outputs a pressure signal; a signal processing module comprising a signal preprocessing circuit and a pressure signal processing circuit; the pressure signal is amplified, filtered and converted by the signal preprocessing circuit, and is sent to the pressure signal processing circuit; comparison processing and feedback adjustment are performed in the pressure signal processing circuit to generate a dynamic compensation signal; a refrigeration and heating control circuit receives the dynamic compensation signal and generates a heating control signal or a refrigeration control signal accordingly, and sends the signal to a heater to heat the semiconductor chip or to a refrigerator to cool the semiconductor chip.

The invention discloses an intelligent electric pole based on bionics, and relates to the technical field of power transmission and transformation facilities. The carbon fiber cloth strip spirally surrounds the electric pole main body and is provided with a through hole; the ends of the shape memory wires penetrate through the through holes of the adjacent carbon fiber cloth strips and are fixed; the strain sensing mechanism is arranged on the carbon fiber cloth strip and is a piezoelectric effect device; the energy storage module is electrically connected to the strain sensing mechanism; the data transmission module is electrically connected to the strain sensing mechanism and the energy storage module; the plurality of carbon fiber cloth strips are provided with joint lines which alternately bypass the front and back surfaces to be connected side by side, and each carbon fiber cloth strip is provided with a plurality of through holes which are arranged along the length direction of the carbon fiber cloth strip; the strain sensing mechanism comprises a plurality of piezoelectric effect elements. The anti-damage electric pole has the effects of improving the anti-damage capability of the electric pole in long-term use and reducing the reinforcing and repairing expenditure.

The present invention relates to a sensor matrix for beds, which incorporates a system for monitoring bedridden individuals for positioning between the bed (1) and the mattress (2), comprising a sensor matrix (3) having at least one layer of electrodes (31) comprising printed circuit modules (34) arranged in rows and columns juxtaposed with a layer of piezoresistive material (32). A microcontroller (4) and a data concentrator (5) are in communication with a local processing unit (6) and simultaneously with a user interface (7). Said sensor matrix (3) generates information regarding the pressure exerted by the bedridden individual's body on the electrodes (35), transmits the data to the microcontroller (4), which transmits the data to the data concentrator (5), which transmits the collected data to the local processing unit (6), which makes the information available on the user interface (7).

The invention relates to a sensor assembly (R) in the form of a ring, the assembly comprising an annular element (ANN) having a substantially cylindrical shape; at least two deformation sensors (SENS1, SENS2, SENS3) mounted on the annular element on at least two radii thereof, respectively, the two radii being angularly separate from one another, so that the at least two sensors are sensitive to an overall deformation of the annular element; and an electronic module (EL) configured so as to produce a detection signal representative of the overall deformation of the annular element in response to the step of processing at least two signals transmitted by the at least two deformation sensors (SENS1, SENS2, SENS3), respectively.

Provided is a piezoelectric element with which a leakage current is suppressed and piezoelectric characteristics are improved. In the piezoelectric element, a piezoelectric layer and a first electrode are stacked in this order on a substrate, and a leakage current suppressing layer is disposed either between the first electrode and the piezoelectric layer, or between the substrate and the piezoelectric layer. A ratio of electrostatic capacitance per unit surface area of the leakage current suppressing layer to electrostatic capacitance per unit surface area of the piezoelectric layer is at least equal to 1.20 and less than 60.00.