17 results about "Piezoelectric beam" patented technology

The application discloses a six-stable-state piezoelectric vibration energy collector, which comprises a base, a cantilever beam, ring magnets, rectangular magnets, MFC piezoelectric sheets and wires. The six-stable-state design of the collector is realized by finely adjusting the equivalent stiffness of the piezoelectric beam, the size and magnetization intensity of the magnets, and the spatial layout of the magnets. When the base is subjected to external excitation in the vertical direction, the MFC piezoelectric sheet on the cantilever beam is subjected to extrusion to generate a voltage difference, and the vibration energy is effectively converted into electric energy. The traditional six-stable-state system needs at least six magnets, and the application only needs to configure four magnets to realize the six-stable-state characteristics. The application not only greatly simplifies the design, simulation and installation process of the multi-stable-state collector, but also brings a new breakthrough to the piezoelectric energy collection technology; and the application also provides a scientific method for determining the stable-state number of the collector, lays a solid theoretical foundation for the manufacture and application of the collector, and has a wide application potential.

A space cam type multi-stage quasi-zero stiffness ultra-low frequency vibration isolator capable of capturing high-entropy energy belongs to the technical field of vibration isolation and vibration energy capture. The problem that traditional quasi-zero stiffness vibration isolation devices are difficult to adapt to multi-stage vibration isolation load due to structural limitations is solved, and sensor self-power supply and intelligent detection are realized. The bottom of the positive stiffness spring and guide beam assembly is connected to the base through a bolt and nut, the sliding end is connected to the load platform through a bolt and nut, four groups of negative stiffness piezoelectric beam assemblies are installed on the support in clockwise order, the vertical guide rail of each negative stiffness piezoelectric beam assembly is connected to the load platform through a bolt and nut, four moving cam sliding grooves are connected to the load platform through a bolt and nut in clockwise order, and the deep groove ball bearing in the negative stiffness piezoelectric beam assembly slides into the corresponding cam sliding groove to form a cam pair. The present application can realize multi-stage load quality vibration isolation and sensor self-power supply, and has the advantages of novel structure, low frequency vibration isolation, wide frequency energy capture and flexible design.

The present application relates to liquid cooling technical field, particularly to a kind of multilayer hole wave suppression device and method based on piezoelectric beam structure, comprising: first wave board and at least one second wave board, the second wave board is set to the first wave board below, the first wave board is set on cooling liquid surface, and the second wave board is set below the cooling liquid surface;The first wave board and second wave board are all equipped with wave hole, and the second wave board is equipped with piezoelectric sheet;The wave hole on the first wave board is used to suppress the fluctuation on the cooling liquid surface;The wave hole on the second wave board is used to suppress internal surge below the cooling liquid surface;The piezoelectric sheet is used to receive internal surge below the cooling liquid surface, to generate electric signal;The piezoelectric sheet is used to vibrate according to the vibration signal generated by the electric signal, and the piezoelectric sheet is also used to drive the second wave board to vibrate, to offset internal surge below the cooling liquid surface.

The invention relates to the technical field of sound energy collection, in particular to a sound energy collection device by coupling a nonlinear Helmholtz resonator and a stretching structure. According to the device, input sound pressure is amplified through the Helmholtz resonator, and the energy collection efficiency is improved by integrating the piezoelectric beam and the stretching structure. External noise is introduced into the noise input module of the acoustic barrier. The module is a cuboid, and a circular truncated cone cavity is dug in the cuboid. And then the incident sound wave enters the Helmholtz resonator, and the device amplifies the sound pressure through the acoustic resonance principle. The amplified sound pressure drives a piezoelectric beam with a stretching structure in the base structure to vibrate, and then kinetic energy is converted into electric energy through a direct piezoelectric effect (mechanical energy to electric energy). And then the electric energy is stored in a capacitor forming an energy storage module, so that power generation is realized.

The invention discloses an intelligent piezoelectric beam vibration suppression control method based on a fuzzy improved active disturbance rejection controller. Firstly, a kinetic model and a state-space equation of the intelligent piezoelectric beam are established; thirdly, according to the state-space equation of the intelligent piezoelectric beam, constructing a fuzzy improved active-disturbance-rejection controller, including designing a nonlinear Arcfu function based on an arctan function, and constructing an extended state observer and a nonlinear state error feedback control law based on the nonlinear Arcfu function; the fuzzy controller generates a deviation increment of the vibration displacement tracking error and the vibration speed tracking error according to the deviation of the vibration displacement tracking error and the vibration speed tracking error, and dynamically adjusts a control law parameter by using the deviation increment; finally, the vibration displacement of the intelligent piezoelectric beam is obtained in real time, the fuzzy improved active disturbance rejection controller generates system control quantity according to the vibration displacement, the system control quantity acts on the piezoelectric ceramic piece, and active vibration suppression control is conducted on the intelligent piezoelectric beam. According to the method, high-frequency oscillation is avoided, and the vibration suppression control effect is enhanced.

The invention relates to the technical field of energy collection, and particularly discloses a piezoelectric type energy collection device based on a suspension support, which comprises a base and a cantilever beam, a bottom piezoelectric beam is arranged in the middle of the top of the base, and supporting seats are arranged at the top of the base on two opposite sides of the bottom piezoelectric beam through mounting seats; two side piezoelectric beams are arranged on the side, away from the mounting base, of the supporting base, a cantilever beam is arranged between the two side piezoelectric beams above the bottom piezoelectric beam, the side piezoelectric beams are connected with one end of a swing arm through a connecting base, the other end of the swing arm is connected with the lower end of the cantilever beam, and the cantilever beam comprises a first cantilever rod and a second cantilever rod. The first cantilever rod is connected with the adjusting mechanism through the connecting mechanism. A series of structures are arranged, the height and angle of the mass block are adaptive to vibration excitation devices at different positions, the direction of the bluff body is adjusted to be adaptive to the wind direction, and the excitation wind speed of bluff body wind is controllably increased.

This invention discloses a multi-directional water-impact frequency-upgrading piezoelectric energy harvesting device and method, belonging to the field of piezoelectric material energy harvesting control. The device includes: an outer frame, a cantilever base plate, a piezoelectric sheet, a mass block, a cylindrical water tank, and an elastic film. One end of the cantilever base plate is fixed to the inner side wall of the outer frame, and the other end is fixed to the mass block. The piezoelectric sheet is attached to the cantilever base plate to form a low-frequency drive system. The bottom end of the cylindrical water tank is fixed to the lower surface of the outer frame, and the elastic film is attached to the cavity at the top of the cylindrical water tank to form a high-frequency piezoelectric system. Under external low-frequency vibration excitation, the low-frequency drive system, which has a lower natural frequency, resonates, greatly increasing the vibration amplitude of the water tank. This causes the water in the water tank to continuously and significantly impact the high-frequency piezoelectric system, achieving the purpose of frequency upgrading. This invention utilizes water impact to drive the high-frequency piezoelectric beam to upgrade its frequency, improving the energy harvesting efficiency and output power of the piezoelectric energy harvesting device. Simultaneously, it has advantages such as simple production and assembly, being environmentally friendly and pollution-free, and having a miniaturized structure.

The invention relates to a sphere vortex-induced vibration piezoelectric energy collection device and method enhanced through base excitation, and belongs to the field of energy collection. The elastic supporting sphere is used for converting wind energy into vibration energy through vortex-induced vibration, meanwhile, the piezoelectric beam receives vibration excitation of the base through the fixed end of the piezoelectric beam, the vibration energy of the base is transmitted to the sphere part, and the vortex-induced vibration effect is enhanced. And vibration energy is converted into electric energy through the piezoelectric beams, so that the output performance and the multidirectional adaptability of the collector are improved. The effective working flow speed range is widened through base excitation, and the effective working flow speed range is expanded to 2.2-7.2 m / s from 2.2-5.4 m / s when only VIV is conducted. Under the optimal frequency matching conditions (the wind speed is 4.47 m / s, fb is equal to 14.3 Hz, and fsp / fp is equal to 1.03), the maximum output voltage reaches 69.53 V, the maximum output voltage is improved by 41.62 V compared with vortex-induced vibration (VIV) only, and the maximum output voltage is improved by 61.92 V compared with base excitation only.

A unidirectional piezoelectric beam with broadband vibration attenuation includes a beam substrate and several sub-units sequentially disposed thereon. Each sub-unit includes: a piezoelectric sensing unit disposed on the upper and lower surfaces of one side of the beam substrate; a piezoelectric actuating unit disposed on the upper and lower surfaces of the other side of the beam substrate; and a unidirectional amplification circuit connecting the piezoelectric sensing unit and the piezoelectric actuating unit on the upper and lower surfaces of both sides, respectively. This invention achieves directional control and broadband attenuation of beam structure vibration energy by constructing an asymmetric electromechanical coupling path. Furthermore, different control strategies can be used to localize vibration energy in different directions, making it suitable for beam structure vibration control and vibration reduction / noise reduction applications.

A kind of high-frequency excitation piezoelectric-electromagnetic composite power generation device for track / road belongs to mechanical vibration energy capture and power generation technical field, the present application is to solve the problem of low output efficiency of existing power generation device under high-frequency vibration excitation.The device composition includes pressing plate, spring, guide rod, T-shaped plate, connecting rod mechanism, piezoelectric beam, permanent magnet, coil, limiting structure and wire.When external excitation acts on the pressing plate, the pressing plate moves down quickly and drives the bottom T-shaped plate to move, and then causes the two sides connecting rod mechanism to arch and act on the piezoelectric beam to cause its bending deformation and output electric energy.At the same time, the permanent magnet at the bottom of the T-shaped plate interacts through magnetic force to cause the change of magnetic flux of the coil and output electric energy.When external excitation ends, the pressing plate and T-shaped plate rise quickly under the action of spring elastic restoring force and reset, waiting for the next external excitation.The device can be widely used in track / road and other high-frequency vibration scenes for energy capture and power generation.

The application discloses a piezoelectric beam type bidirectional micro mechanical vibration energy collector with eccentric mass, which comprises a substrate, a cantilever beam and a mass with an eccentricity R0; the cantilever beam is arranged on the substrate, the upper surface of the cantilever beam is provided with a piezoelectric layer, the position starting point of the piezoelectric layer is at the root of the cantilever beam, and the width of the piezoelectric layer is equal to the width of the cantilever beam; the eccentricity of the mass is R0=L / 2, wherein L is the length of the cantilever beam, and L E is the length of the piezoelectric layer. Compared with the mass in the prior art, the mass center of the mass is far away from the longitudinal axis of the cantilever beam, and the vibration energy in the horizontal direction cannot be collected; the piezoelectric beam type bidirectional micro mechanical vibration energy collector with eccentric mass can collect the vibration energy in two directions simultaneously, the mass center of the mass is far away from the longitudinal axis of the cantilever beam, and the size is relatively large; when the foundation is horizontally vibrated, the mass generates a larger horizontal inertia moment, causes the cantilever beam to vibrate and deform, and simultaneously converts the vibration energy in the horizontal and vertical directions into electric energy.

This invention discloses a shoe heel power generation device that can power wearable devices. It includes a base plate in contact with the ground and an upper plate adhered to the upper surface of the base plate and to the sole of the shoe. The upper plate has a mounting groove and a square deformation groove. A cuboid support block is provided on the bottom surface of the square deformation groove. The mounting groove is adhered to the root of a piezoelectric cantilever beam. The deformable end of the piezoelectric cantilever beam is located below the square deformation groove. A limit block is provided on the deformable end of the piezoelectric cantilever beam, penetrating and slidably disposed within a sliding through hole. Pressing the limit block causes the piezoelectric cantilever beam to deform. A circuit board placement groove is provided on the surface of the base plate in contact with the upper plate, and an energy storage circuit board connected to the piezoelectric cantilever beam is disposed within the circuit board placement groove. A cuboid support block is placed at a designated position below the piezoelectric cantilever beam, thereby ensuring that the piezoelectric beam generates the same stress along its entire length from root to top as at the root during deformation, thus increasing the output voltage of the piezoelectric cantilever beam.

This invention discloses a functionally graded piezoelectric beam sensor, a sensor manufacturing apparatus, and a manufacturing method, belonging to the field of sensors. The functionally graded piezoelectric beam sensor includes a piezoelectric vibration sensor and a piezoelectric vibration sensor. The piezoelectric vibration sensor is connected to a beam frame, and there are multiple piezoelectric vibration sensors distributed on the upper and side surfaces of the beam frame. The beam frame is clamped to a foundation, and the foundation has pre-set grooves corresponding to the beam frame. A transverse stabilizing cylinder and a vertical stabilizing cylinder are slidably mounted on the beam frame. Multiple sets of piezoelectric vibration sensors on the beam frame can perform synchronous measurements at different positions and directions, measuring multiple vibration data. A connecting column is inserted into the bottom wall of the inner groove of the convex groove. At this time, the piezoelectric vibration sensor is not in contact with the beam frame but is directly plugged into the foundation 3 for further detection in multiple directions.

The application provides a macro-fiber piezoelectric composite performance degradation test method, comprising the following steps: obtaining initial test data, then performing degradation test on the macro-fiber piezoelectric composite in the piezoelectric beam, obtaining the macro-fiber piezoelectric composite performance data after the degradation test, finally comparing and analyzing the macro-fiber piezoelectric composite performance data before and after the degradation, and determining the macro-fiber piezoelectric composite performance degradation test result. The application compares the voltage output signal and the piezoelectric cantilever beam root strain response data of the macro-fiber piezoelectric composite before and after the degradation, and determines the macro-fiber piezoelectric composite performance degradation test result. Based on the degradation data of the piezoelectric beam, the macro-fiber piezoelectric composite degradation curve can be obtained, the degradation behavior is determined, and the macro-fiber piezoelectric composite degradation behavior is interpreted from the physical mechanism.

The application discloses a kind of functional gradient sandwich piezoelectric structure impact response analysis method and equipment, based on plane bending hypothesis, the constitutive model considering electromechanical coupling effect is revised, and displacement field framework is constructed using revised high-order shear beam theory;In order to obtain the post-buckling equilibrium path caused by external voltage, an external voltage perturbation scheme is proposed;The dynamic control equation of pre-buckling and post-buckling piezoelectric nanobeam is derived, and the two-step perturbation technique is combined with high-order Galerkin integration to develop an approximate solution for impact response.The analysis method provided by the application overcomes the problems of multi-physical field and nonlinearity, and improves the calculation accuracy.The method takes the impact response of pre-buckling and post-buckling piezoelectric beam as the measurement index of piezoelectric beam impact resistance, effectively providing technical reference for the structural design of piezoelectric beam in multi-physical field.

This application relates to the field of rotating machinery fault diagnosis technology, and more particularly to a rotating machinery fault diagnosis system and method. The rotating machinery fault diagnosis system includes a microcontroller and a multi-degree-of-freedom piezoelectric beam device mounted on the rotating machinery. The multi-degree-of-freedom piezoelectric beam device includes an outer beam assembly and at least one inner beam assembly, which are respectively connected to the microcontroller. The outer beam assembly is configured to collect vibration signals from the rotating machinery, and the inner beam assembly is configured to capture the vibration energy of the rotating machinery to power the microcontroller. The microcontroller is configured to perform fault diagnosis on the rotating machinery based on the vibration signals to obtain fault analysis results. This system not only achieves self-powered, maintenance-free operation but also improves the accuracy of fault diagnosis for rotating machinery.