560 results about "Piezoelectricity" patented technology

The invention belongs to the technical field of biomedical engineering, and particularly relates to a biological rotator cuff patch with a double-gradient structure and a preparation method of the biological rotator cuff patch. The preparation method comprises the following steps: carrying out electrostatic spinning on a spinning solution, controlling the rotating speed of a receiving roller to increase at a constant speed in the electrostatic spinning process, and obtaining a nanofiber membrane after electrostatic spinning; l-polylactic acid and D-polylactic acid are simultaneously dissolved in the spinning solution; the minimum value of the rotating speed of the receiving roller is 100-500 rpm, and the maximum value of the rotating speed of the receiving roller is 3000-4000 rpm. The finally prepared biological rotator cuff patch with the double-gradient structure presents an orientation degree gradient and a piezoelectric effect gradient at the same time on the thickness scale, and has mechanical supporting capacity and biocompatibility, and bionic healing promotion of the patch with the gradient structure is achieved.

The invention relates to a preparation method and application of a Janus structure photo-thermal-piezoelectric hydrogel dressing for infected wound repair, and the preparation method comprises the following steps: respectively dissolving phenylboronic acid grafted methacrylamide gelatin and dopamine grafted hyaluronic acid in deionized water, adding MXene coated CeO2 heterojunction, and ultrasonically dispersing uniformly, so as to obtain the Janus structure photo-thermal-piezoelectric hydrogel dressing for infected wound repair. After mixing, sodium hydroxide is used for adjusting the pH value to alkalescence, and a Janus structure inner layer is formed; respectively dissolving phenylboronic acid grafted gelatin and o-nitrobenzyl alcohol grafted hyaluronic acid in deionized water, adding BaTiO3, ultrasonically dispersing uniformly, and mixing to form a Janus structure outer layer; the Janus structure photo-thermal-piezoelectric hydrogel dressing prepared by the invention has the characteristic of space-time release so as to adapt to the wound repair process, in addition, the Janus structure photo-thermal-piezoelectric hydrogel dressing also has excellent photo-thermal conversion performance, bacteria infecting the wound are killed through photo-thermal heating, physiological electric signals are effectively simulated through the piezoelectric effect, cell behaviors are regulated and controlled, and the Janus structure photo-thermal-piezoelectric hydrogel dressing can be used for wound infection repair.

The utility model relates to the technical field of acceleration sensors, in particular to a piezoelectric acceleration sensor, which comprises a shell, a mounting cavity is arranged in the shell, a shielding shell is fixedly connected in the mounting cavity, a crystal base is fixedly connected at the bottom end in the shielding shell, a PCB (printed circuit board) is arranged at the upper part in the shielding shell, and the crystal base is fixedly connected with the crystal base. An external force is applied along the polarization direction of the ceramic wafer to deform the ceramic wafer, the inside of the ceramic wafer is polarized, charges with opposite polarities appear on the two stressed end faces, and the ceramic wafer is recovered to an initial state if the external force is removed, so that mechanical energy is converted into electric energy by utilizing the direct piezoelectric effect of the ceramic wafer, and then the electric energy is subjected to signal processing; the sensor outputs 100mv / g alternating current voltage, so that vibration acceleration signals are measured, triangular shearing is adopted by a measuring element, a two-core shielding cable is adopted by a cable, and the sensor is small in size, light in weight and high in applicability.

The invention discloses a fine gap-adjustable tilting pad bearing and a control method, and belongs to the technical field of bearings, and the fine gap-adjustable tilting pad bearing comprises a bearing body, pads, pre-tightening screws, set screws, a cover plate, a displacement amplification structure, pre-tightening bolts, elastic gaskets and piezoelectric ceramic stacks. A plurality of tilting pads are arranged on the inner arc surface of the bearing body and are matched with the bearing body through a spherical support; four radial grooves are formed in the outer arc face in the circumferential direction and are opposite to the centers of the four tile blocks respectively. A notch of the radial groove is connected with a cover plate, is internally provided with a piezoelectric ceramic displacement amplification mechanism and is connected with the spherical support through a positioning pin; a piezoelectric ceramic stack is arranged between a left boss and a right boss of the mechanism and is pre-tightened by a pre-tightening bolt and an elastic gasket. According to the invention, the inverse piezoelectric effect of piezoelectric ceramics is utilized, a vibration and non-linear suppression method is provided, an advanced control algorithm is matched, the piezoelectric ceramics stack is electrified and contracted, a displacement amplification effect is generated through a displacement amplification mechanism, the tile gap is finely adjusted, and the high-performance requirement of modern rotating machinery is met.

According to the flexible sensor for synchronously detecting dynamic and static states and internal conditions of human muscles, dynamic and static force cooperative detection and ultrasonic detection are integrated, and by using the elastic piezoelectric body containing the conductive filler, when the sensor is subjected to compression or stretching deformation, the resistivity and capacitance change greatly. By utilizing the piezoelectric effect and inverse piezoelectric effect of the material, an ultrasonic sensor is compatible with a piezoelectric capacitance type integrated sensor. Flexible electrodes (such as silver nanowires and graphene) and biocompatibility packaging (such as PDMS) are adopted. A time division strategy is adopted, and dynamic and static pressure detection and ultrasonic detection are alternately executed. Based on the technical scheme of the invention, the requirement of realizing accurate monitoring of dynamic force and static force in a full frequency range by using a single flexible sensor is met; the volume and weight of the device are greatly reduced, so that the sensor has good flexibility and wearing comfort, is suitable for physiological monitoring, avoids signal crosstalk and ensures data accuracy.

The invention discloses a high-linearity dynamic and static pressure flexible sensor based on Gaussian height distribution. The high-linearity dynamic and static pressure flexible sensor comprises a packaging layer, an upper electrode layer, a piezoelectric layer, a common electrode layer, an insulating layer, a lower electrode layer and a substrate layer which are sequentially stacked from top to bottom, the piezoelectric layer comprises a plurality of PVDF micro-columns, the top ends of the PVDF micro-columns are fixedly connected with the upper electrode layer, the bottom ends of the PVDF micro-columns are provided with micro-electrode layers, and the height of the PVDF micro-columns is of a Gaussian distribution structure from the center to the periphery; the common electrode layer is provided with a plurality of micro-column through holes which are completely overlapped with the PVDF micro-columns; the output leads of the upper electrode layer and the common electrode layer output piezoelectric signals corresponding to dynamic pressure, and the output leads of the common electrode layer and the lower electrode layer output capacitance signals corresponding to static pressure. According to the invention, the dynamic pressure is measured by using the piezoelectricity of PVDF, synchronous measurement of static pressure is realized through a Gaussian distribution structure of a plurality of PVDF micro-columns, and high-sensitivity and high-linearity output of dynamic and static pressure measurement signals is realized.

The invention relates to the technical field of medical instruments, and discloses an interbody fusion cage with a piezoelectric property on the surface and a preparation method thereof, and the preparation method comprises the following steps: S1, printing a sample of the interbody fusion cage by adopting a 3D printing process; s2, the sample in the step S1 is subjected to heat treatment, the heat treatment temperature is 800 DEG C, and the heat treatment time is a first duration; and S3, coating the piezoelectric ceramic powder on the surface of the sample to form a piezoelectric coating. The interbody fusion cage sample is manufactured by adopting a 3D printing process, is simple and convenient to form and can be customized according to the requirements of different patients; heat treatment is carried out after the sample is manufactured and formed, an alpha + beta titanium alloy crystalline phase structure can be obtained, and the comprehensive performance of the sample is improved; the piezoelectric coating is formed on the surface of the sample, the interbody fusion cage has piezoelectricity, and the piezoelectric coating can stimulate tissue growth and repair, accelerate osseointegration and promote interbody fusion of the human body.

The invention discloses an unpowered air purification device based on electrostatic adsorption and negative ion effects, and relates to the technical field of air purification, the unpowered air purification device comprises a ventilation pipeline, an electrostatic adsorption module, a particle capture net, a negative ion release module and the like, a wind scooper guides airflow to enter the electrostatic adsorption module, and a friction ball rubs with an electrode plate to enable the electrode plate to be electrified; particulate matters in the air are adsorbed, falling particulate matters are collected by a liquid collecting box, residual particulate matters are further intercepted by a particulate capturing net, the elastic design is convenient for shaking off and cleaning, and the negative ion release module accelerates the generation of negative ions and purifies the air by utilizing the solar thermal conversion and piezoelectric effect. Efficient air purification is achieved through a multi-stage purification structure, the functions of humidity adjustment, intelligent reminding and the like are achieved, the structure is simple, energy conservation and environment protection are achieved, the device can adapt to various scenes, and an innovative scheme is provided for solving the air pollution problem.

The invention discloses a piezoelectric effect excitation method and application thereof. The piezoelectric effect of piezoelectric catalytic material particles is excited by applying mechanical stress to the piezoelectric catalytic material particles through rotational flow oscillation. According to the piezoelectric effect excitation method provided by the invention, the piezoelectric effect of the piezoelectric catalytic material is excited by adopting rotational flow oscillation, the excitation effect on the piezoelectric effect of the piezoelectric catalytic material particles in the rotational flow field can be realized through relatively low energy input, and no matter how large the reactor exists, the piezoelectric effect can be excited. All the piezoelectric catalytic particles in the rotational flow field can be subjected to large rotational flow oscillation mechanical stress, so that the piezoelectric effect of the piezoelectric catalytic material particles in the rotational flow field in the reactor can be effectively excited, the catalytic efficiency of the piezoelectric catalytic material particles is improved, and a foundation is laid for large-scale application of piezoelectric catalytic materials.

The invention discloses a plasma hydrodynamic cavitation aeration coupled piezoelectric catalysis organic wastewater treatment system and method. The system comprises a wastewater tank, a water pump, a Venturi tube hydrodynamic cavitator, a catalytic oxidation reactor, a piezoelectric particle separator, a piezoelectric catalytic particle bin, a low-temperature plasma generator and an air pump. By coupling piezoelectric catalysis, pressure pulsation mechanical energy generated by hydrodynamic cavitation is converted into chemical energy for driving the piezoelectric effect, on one hand, pollutants are directly oxidized, and on the other hand, plasma by-product H2O2 is efficiently converted into. OH with strong oxidizing property, so that cooperation with plasma advanced oxidation is formed, and the pollutant removal efficiency is improved. The pollutant degradation energy efficiency and the energy utilization rate of the system are greatly improved. Meanwhile, the system realizes efficient recovery and cyclic utilization of the magnetic piezoelectric catalytic particles through the magnetic separation type piezoelectric particle separator, so that secondary pollution of the catalyst is fundamentally avoided.

The utility model relates to the technical field of electronic components, and discloses a stacked piezoelectric ceramic electrode, which comprises an upper insulating layer and a lower insulating layer, a piezoelectric component is mounted in the upper insulating layer, an insulating layer is fixedly connected outside the upper insulating layer, a leading-out component is mounted outside the upper insulating layer, and a lead-out pin is fixedly connected outside the leading-out component. The exterior of the upper insulating layer is fixedly connected with a fixed plate; the piezoelectric assembly comprises a positive electrode layer, the positive electrode layer is fixedly connected to the interior of the upper insulating layer, the exterior of the positive electrode layer is fixedly connected with a piezoelectric ceramic material film, and the exterior of the piezoelectric ceramic material film is fixedly connected with a piezoelectric ceramic piece. According to the utility model, under the direct piezoelectric effect, the multi-layer structure piezoelectric ceramic piece, the piezoelectric ceramic material film and the plurality of piezoelectric dielectric layers can more efficiently convert external weak mechanical force into electric signals and generate obvious charge change, so that the electric charge is accurately detected, and the sensitivity of the sensor is greatly improved.

The invention discloses a two-component negative oxygen ion water-based paint decorative sheet and a preparation method thereof, the two-component negative oxygen ion water-based paint decorative sheet comprises a base material and a functional coating coated on the surface of the base material, and the functional coating is formed by mixing and curing a component A and a component B; the component A is prepared from the following substances in parts by weight: 50 to 70 parts of water-based paint, 10 to 20 parts of cerium-doped modified tourmaline powder and 5 to 15 parts of microcapsules; negative oxygen ions are released through the piezoelectric effect and the pyroelectric effect in the pure physical process, cerium-doped modified tourmaline powder is added into the bi-component polyurethane emulsion water-based paint, after full stirring, the water-based paint is prepared, and the water-based paint is prepared. The nano-scale tourmaline is uniformly coated on a decorative artificial board with primer, and after curing, the nano-scale tourmaline effectively contacts with air, can stably release negative oxygen ions, and does not generate negative effects on human bodies.

The invention relates to a production process of an elastic braid, which realizes transverse elasticity consistency and edge warping inhibition of the braid by constructing a full-flow tension balance control and structural stability enhancement mechanism. According to the process, composite elastic yarn provided with a photoelastic coating is utilized, tension is regulated and controlled through a multi-point micro traction structure driven by piezoelectricity, and the tension difference value of a braid within the range of every 2 mm is controlled within + / -0.03 N. A double-sided weft knitting system is adopted, thermal response type microcapsules are implanted into the edge of the braid in the knitting process, and the microcapsules release cross-linked components in the thermal treatment process to enhance the edge shaping stability. The heat treatment device is of a closed structure and is provided with an infrared heating area, a master control constant-temperature area and a blast cooling area, the constant-temperature area is integrated with a phase-change material buffer module and a tension feedback system, and the consistency of temperature control precision and transverse heat distribution is achieved. The winding state is compensated in real time through a laser scanning and flexible guide rail linkage device, and the high-performance elastic braid which is uniform in structure and stable in elasticity is obtained.

The invention relates to the technical field of mouse self power generation, in particular to a low-frequency automatic power supply wireless mouse system. The wireless mouse comprises a wireless mouse body, a self-power-generation module installed in the wireless mouse body and an energy control module for charging electric energy generated by the self-power-generation module into a wireless mouse battery. The self-power-generation module comprises a flexoelectric structure and a piezoelectric structure which are clamped between keys and a mouse base. The flexoelectric structure and the piezoelectric structure can deform at the same time under the pressing action of the key so as to generate electric energy through the flexoelectric effect and the piezoelectric effect respectively. By integrating the self-power-generating module, the wireless mouse system can generate electric energy by using the key pressing action of the mouse in daily use, so that the built-in battery is automatically charged. By means of the mouse, the endurance time of the mouse is greatly prolonged, the trouble of frequently replacing a battery or charging the battery is reduced, the use convenience and the satisfaction degree of a user are improved, and meanwhile the concepts of environmental protection and sustainable utilization of energy are reflected.

The invention discloses a focusing type acoustic streaming heat dissipation device facing a chip. The device belongs to the crossing field of ultrasonic technology and heat dissipation technology and is composed of a piezoelectric stack, an acoustic lens, a splitter plate, a base, a supporting rod, a copper electrode and the like. According to the device, geometric parameter configuration of the splitter plate, the piezoelectric stack and the acoustic lens is optimized, and a double-piezoelectric-plate stacked structure is adopted to enhance the ultrasonic resonance effect; high-frequency alternating voltage is applied to the copper electrodes at the two ends of the piezoelectric stack, high-frequency sound waves are excited through the inverse piezoelectric effect, and after the sound waves are focused through the sound lens, a gradient sound pressure field is formed in a cavity formed by the splitter plate and the piezoelectric stack; air molecules are driven to move directionally based on the acoustic streaming effect, so that air flow at an air inlet is accelerated by sound pressure to form high-flow-rate focusing jet flow at an air outlet, and targeted forced convection heat dissipation of a chip heat source is realized. According to the device, the ultrasonic technology and the heat dissipation technology are combined, the whole device is simple in structure, free of moving parts and low in noise, and various heat dissipation requirements can be met in an array mode.

The invention belongs to the field of biological medicine and material science, and particularly relates to an intelligent response type piezoelectric nanofiber dressing and a preparation method and application thereof. According to the preparation method, polyvinylidene fluoride-trifluoroethylene, a high polymer material and inorganic nanoparticles are blended and spun through an electrostatic spinning technology, and then a photo-thermal component coating is subjected to surface in-situ oxidation and self-polymerization, so that the composite fiber membrane is prepared. Under the stimulation of ultrasound (US) and near-infrared laser (Laser), the fiber membrane can cooperatively activate the piezoelectric effect and the photothermal effect, generate a dynamic electric field and local high temperature, realize multi-mode cooperative killing of bacteria (the antibacterial rate exceeds 99%), and simulate an endogenous electric field to promote cell migration and wound healing. The dressing has good mechanical properties (the Young modulus is 15-20 MPa), hydrophilicity (the contact angle is about 30 degrees), biocompatibility and stability, is suitable for treatment of chronic infected wounds such as diabetes mellitus and the like, and has the advantages of on-demand activation and intelligent response.

The invention discloses a solar energy collecting structure and an offshore multi-energy collecting device. Comprising a dish-shaped main plate for providing buoyancy to collect solar energy, an upper energy collection device for generating power by using heat generated by a convex lens to drive internal spring-shaped memory alloy to press a flexible piezoelectric material, and a lower energy collection device for collecting energy by using an internally arranged cantilever beam, a permanent magnet and a magnetic induction coil. The upper energy collecting device collects solar energy, the lower energy collecting device enables the mass block to vertically reciprocate relative to the magnetic induction coil fixed at the bottom through fluctuation of seawater and inertia of the mass block, and the cantilever beam and the piezoelectric plate attached to the cantilever beam are driven to vibrate while the magnetic induction coil is cut to complete power generation. And the magnetic induction coil at the tail part of the roller sliding block horizontally moves relative to the permanent magnet fixed on the inner wall, and energy collection is completed by utilizing a piezoelectric effect and a Faraday effect. The power generation efficiency is high, the energy collection efficiency is high, and the device is flexible and reliable.

The invention discloses an organic-inorganic mutually-embedded space structure AAO / PVDF composite coating and a preparation method thereof, based on a hard template-soft modification technology, a hard porous anodic oxidation aluminum oxide layer is obtained on the surface of an aluminum alloy; injecting a polyvinylidene fluoride (PVDF) solution into the nano pore channels of the anodic aluminum oxide layer through a vacuum pressure impregnation process and a solution casting method, curing to form a nano column array structure, and performing high-pressure polarization treatment on PVDF nano columns by adopting a corona polarization mode; and the antibacterial, antifouling and anticorrosive AAO / PVDF composite coating based on environment excitation charge response of the piezoelectric effect can be prepared. The AAO / PVDF coating disclosed by the invention has excellent antibacterial property, strong interface bonding and stable piezoelectric property, and PVDF effectively seals nano pore channels of AAO, so that the anti-corrosion property of the aluminum alloy is remarkably improved, and the anti-corrosion and anti-fouling process has the characteristics of being long-acting, environment-friendly and efficient.

A sacroiliac (SI) joint implant assembly addresses SI joint dysfunction and degenerative sacroiliitis. The assembly includes a first implant body, a second implant body, and a piezoelectric layer positioned between them. The piezoelectric layer generates electrical charges when subjected to mechanical stress, stimulating bone growth and enhancing stability of the SI joint after surgery. The implant bodies may feature non-planar surfaces to distribute compressive and shear forces unevenly across the piezoelectric layer. The assembly can be secured using fasteners such as screws, pins, or brackets, and may include porous or fenestrated bodies made from materials like titanium or polymers. Some implant assemblies are designed for minimally invasive surgical procedures, with configurations that allow for precise placement using guide wires and imaging techniques. The assembly aims to stabilize the SI joint and promote bone fusion, leveraging the piezoelectric effect to improve the overall efficacy of the fusion procedure.

The invention discloses a utilization method of a waste carbon fiber reinforced resin-based composite material and a belt mortar type rubbing and grinding activation machine, and belongs to the field of waste recycling. Carrying out rubbing friction catalysis and ultrasonic piezoelectric catalytic activation on the waste carbon fiber reinforced resin-based composite material and the barium titanate turbid liquid by adopting a rubbing and grinding activation machine with a mortar, then spraying an activating agent solution, and continuously soaking, rubbing and activating to obtain the modified waste carbon fiber reinforced resin-based composite material. And carrying out variable-pressure gradient heating carbonization activation to prepare the activated carbon barium titanate composite adsorption catalyst. According to the method, barium titanate piezoelectricity and friction catalysis coupled mechanical rubbing are adopted to activate a carbon fiber reinforced resin-based composite material, the stability of the carbon fiber reinforced resin-based composite material is reduced, the difference between carbonization activation conditions and performance of resin and carbon fibers is reduced, carbonization is controlled by adopting pressure transformation and temperature combination, and the activated carbon barium titanate composite adsorption catalyst is obtained. The method can be used for treating heavy metal-containing organic wastewater, new pollutant wastewater and waste gas.

The invention relates to a clamping system, in particular to a low-stress flexible clamping system for an aluminum-based silicon carbide ultrathin reflector, which comprises an air floatation supporting part, a clamping part and a clamping part, the air floatation supporting part comprises an air bag, the air bag is arranged above a bottom plate, the air bag is U-shaped, and two U-shaped supporting sheets at the upper end of the air bag are opened after the air bag is inflated; the self-adaptive clamp is also in a U shape, when the air bag is opened, the self-adaptive clamp is pulled to be opened outwards, and when the high-temperature reflecting mirror is clamped, the self-adaptive clamp recovers to the original shape, and the reflecting mirror is clamped; after the air bag is inflated, the two U-shaped supporting sheets at the upper end of the air bag are opened, and the opening tension is enough to pull open the self-adaptive clamp in a martensite phase, so that the reflecting mirror can be conveniently placed in the clamping system; when the reflector is clamped, the micro-displacement compensation block begins to extend under the inverse piezoelectric effect, the thickness of the micro-displacement compensation block is reduced, the counter-acting force on the reflector is reduced, flexible clamping is achieved, the assembling stress of the reflector is reduced, surface precision loss is prevented, and therefore the flatness of the surface of the reflector is improved.

The invention provides a Ti2C-coated MoS2 composite material as well as a preparation method and application thereof, and belongs to the technical field of catalytic hydrogen production. The preparation method comprises the following steps: mixing a molybdenum source, a sulfur source, an organic solvent and Ti2C, and reducing under a high-temperature condition to obtain the Ti2C-coated MoS2 composite material. Ti2C and MoS2 are combined to form a heterostructure through a high-temperature reduction reaction, the excellent piezoelectric effect of the heterostructure is utilized, the catalytic activity and stability of molybdenum disulfide are remarkably improved, and the excellent hydrogen production rate is achieved when hydrogen is produced through piezoelectric catalysis of water decomposition. The result of the embodiment shows that the hydrogen production rate of the Ti2C-coated MoS2 composite material prepared by the preparation method disclosed by the invention can reach 870.09 [mu] mol.g <-1 >. H <-1 >.

The invention discloses a composite silicon-based negative electrode modified by a piezoelectric effect. The composite silicon-based negative electrode comprises a copper foil current collector, a negative electrode active layer blade-coated on the surface of the copper foil current collector and an inorganic piezoelectric coating sprayed on the surface of the negative electrode active layer, the inorganic piezoelectric coating is formed by uniformly spraying a piezoelectric solution on the surface of the negative electrode active layer under a high-temperature condition and drying; the piezoelectric solution is formed by mixing a piezoelectric ceramic material, a garnet type material, a second binder and a second organic solvent; and the negative active layer is formed by mixing a silicon-based active material, a conductive agent, a first binder and a first organic solvent. The composite silicon-based negative electrode with a double-layer piezoelectric-conductive negative electrode structure is formed by combining a piezoelectric material with a garnet type material, so that the defect of poor conductivity of the piezoelectric material is overcome, collaborative optimization of a piezoelectric effect and a conductive network is also realized, and the comprehensive performance of the battery is remarkably improved.

The invention discloses a multi-mode tactile sensor based on cross-shaped array design, the sensor is provided with five sensing units which are arranged in a cross-shaped array form, and each sensing unit is composed of a stress loading layer, a piezoelectric sensing layer, an isolation layer, a piezoresistive sensing layer and an electrode layer. The area of a perceptible region of the sensor is increased due to array type distribution, and the spatial resolution of the sensor is improved. Wherein the piezoresistive sensing layer and the piezoelectric sensing layer respectively simulate the characteristics that an SA receptor in human skin senses low-frequency pressure and an FA receptor senses dynamic vibration. The piezoresistive sensing unit and the electrode unit form a planar resistance structure, so that the sensor is sensitive to the direction of a loading force, and the design can be used for representing the magnitude and direction of the loading force, thereby realizing three-dimensional static force detection. The piezoelectric sensing unit utilizes the direct piezoelectric effect of a PVDF piezoelectric film to realize tiny vibration detection and is used for representing high-frequency vibration when the piezoelectric sensing unit is in contact with an object.

The invention discloses an intelligent deviation correction method for tunneling equipment based on inertial navigation, and relates to the technical field of dynamic stress measurement, and the method comprises the following steps: integrating a piezoresistive strain microsensor on the surface of a support beam of a tunneling machine; according to the invention, the piezoresistive sensor is integrated on the support beam to realize dynamic stress self-sensing, and the ANFIS model is utilized to construct a nonlinear compensation relation, so that the limitation of traditional linear calibration is broken through; a piezoelectric-piezomagnetic composite structure is designed to convert vibration energy into electric energy, an inverse piezoelectric effect is driven and fed back to the calibration model, and self-energy-supply dynamic compensation is achieved; a bionic self-repairing supporting beam is adopted, micro-cracks are repaired in real time through a shape memory material and a nano-particle filling structure, and the environmental adaptability is enhanced in combination with a super-hydrophobic coating; a passive vibration isolation thought is subverted, a self-sensing-self-compensation-self-repairing system is constructed, the navigation precision, cruising ability and reliability of tunneling equipment under high-frequency vibration are remarkably improved, and a key technical support is provided for underground engineering intelligentization.

The utility model relates to a torsion measuring device which comprises a wrench body and a measuring module used for measuring torsion applied to the wrench body. The torque wrench is characterized in that the measuring module is a piezoelectric resonant sensor, the piezoelectric resonant sensor is embedded in the wrench body, and the piezoelectric resonant sensor is configured to be capable of reflecting the change of torque according to the change of oscillation frequency generated by the piezoelectric resonant sensor. The device has the advantages that the piezoelectric resonant sensor serves as a measuring module, a frequency signal generated by the piezoelectric resonant sensor due to the piezoelectric or inverse piezoelectric effect can be directly used as a force sensing signal, the principle is that the oscillation frequency of the piezoelectric resonant sensor changes under the action of external force, and the frequency variation is used as a change value for judging the force of the piezoelectric resonant sensor; a frequency value can be directly detected or converted into a voltage signal, and the piezoelectric resonant sensor has the sensor characteristics of good measurement precision, sensitivity, response time, hysteresis and the like, so that the measurement precision of torsion is improved.

The device disclosed by the invention integrates the photocatalytic reaction area, the diversion area, the settling area and the piezoelectric photocatalytic particle hopper, and the propeller blades are effectively driven to rotate through a dual driving mechanism of water jet and the aeration device, so that the screw rod is driven to work, and piezoelectric photocatalytic particles are lifted to the top of the reactor. In the process, the rotation of the screw rod is linked with the operation of the micro generator, and the generated electric energy is directly supplied to the LED light source and the electrode plate, so that the overall energy consumption of the reaction device is greatly reduced. Under the action of double external forces of aeration and stirring, a strong piezoelectric field is excited inside the piezoelectric material, so that the coupling of a photocatalytic effect and a piezoelectric effect is realized. And then, the photocatalytic particles are continuously and uniformly distributed in the reactor in a circulating manner by virtue of the rotating power of lifting of the baffle and the screw rod. Besides, the aeration device not only enhances the reaction efficiency, but also provides necessary driving force for piezoelectric photocatalytic particles, and realizes the self-cleaning function of the particles, so that the photocatalytic reaction rate and the recycling efficiency of a photocatalyst are remarkably improved.

The invention provides a novel composite tilting and folding rotor integrated mechanism and an aircraft, and belongs to the technical field of tilting rotor aircrafts. The mechanism and the aircraft are characterized in that the whole aircraft comprises a fuselage, an empennage, an undercarriage, two wings and two tilting rotor devices. The wings are located on the two sides of the fuselage, rotor wing tilting mechanisms at the tail ends of the wings are driven by hydraulic cylinders to achieve overall rotation, and modes can be switched in the take-off stage and the cruise stage. The folding function of the paddle is controlled by adopting a linear telescopic connecting rod mechanism driven by a hydraulic rod to realize two states of retraction and unfolding; a piezoelectric ceramic material and an energy storage device are embedded in the tilting mechanism, and current is generated by utilizing the piezoelectric effect when the unmanned aerial vehicle flutters, so that electric energy is recycled and supplied to the folding device; meanwhile, a PID control algorithm is adopted, so that the aircraft is good in stability and high in response speed during hovering and vertical take-off and landing; the reliability of the aircraft can be improved, the aerodynamic performance can be improved, and high flexibility and wide application prospects are achieved.

The invention discloses an intelligent interactive garden landscape piezoelectric photocatalytic water purification device which is based on a light-electricity-gas collaborative purification mechanism and intelligent energy regulation and control. Light energy is converted into electric energy through a solar cell module, and mechanical energy is converted into electric energy through a pressure induction power generation floor; the LED light source is driven to activate electron transition of the piezoelectric photocatalytic material, and hydroxyl radicals are generated to efficiently degrade pollutants; meanwhile, water flow mechanical energy excites a piezoelectric effect to form an auxiliary electric field, an aeration system is superposed to supply oxygen to enhance oxidation reaction, and multi-path synergistic decomposition of pollutants is achieved. The interaction system interacts with a user through an infrared sensor and a pressure sensing power generation floor, and an intelligent controller dynamically adjusts the light source intensity, the aeration frequency and the water flow circulation, so that the purification efficiency is ensured; and an integrated circulating system of solar energy supply, intelligent regulation and control, collaborative purification and ecological recycling is formed, and finally the target of water resource regeneration and scientific and ecological integration is achieved.

The invention discloses application of a piezoelectric-photocatalytic composite material in a spiral-flow type hydrogen production device, and belongs to the technical field of energy environments and materials. The preparation method comprises the following steps: growing a ZnO nanorod array on the surface of a designed porous material in situ through a hydrothermal method, and carrying out annealing treatment to obtain a composite structure with remarkable piezoelectric property; then the composite material is placed in a spiral-flow type hydrogen production device matched with the composite material, the piezoelectric effect of the piezoelectric-photocatalytic composite material can be improved under excitation of a high-speed rotating turbulent flow field, and meanwhile efficient gathering and separation of hydrogen are achieved through a central negative pressure area. Experimental verification shows that ZnO / NF particles show higher hydrogen evolution efficiency and stability under the action of dynamic shear force after the designed piezoelectric-photocatalytic composite material loaded ZnO particles are put into a cyclone. The test verifies that the piezoelectric-photocatalytic composite material prepared by the invention has the optimal hydrogen evolution rate at the rotating speed of 1000rpm.