22 results about "Piezoelectric bimorph" patented technology

The invention discloses an impact press-in test system based on a piezoelectric bimorph cantilever beam and a test method thereof. According to the invention, a piezoelectric bimorph cantilever beam is used as an actuator of a test system, and the piezoelectric bimorph cantilever beam is a macroscopic large-stroke piezoelectric actuator; a large-current high-voltage power supply is used for providing excitation voltage for a piezoelectric bimorph cantilever beam, large current rapidly charges a piezoelectric patch so as to generate high excitation voltage in an extremely short time, rapid bending deformation occurs, and a free end pressure head is pressed into the surface of a sample at a rapid impact speed; a force sensor and a laser displacement meter are adopted to form a measuring system, and force and displacement generated in the impact press-in process of a pressure head are measured in the same position at the same time; establishing a one-dimensional harmonic oscillator model, and calculating to obtain the real press-in load of the pressure head in the impact press-in process; according to the invention, the construction is simpler, the environmental adaptability and operability are strong, the requirement on the test environment is not very strict, and the test can be carried out under some complex conditions.

The present invention discloses a longitudinal-bending composite linear feeding device driven by piezoelectricity and its working method. The feeding device includes a base, a first piezoelectric vibrator, a second piezoelectric vibrator, a top plate, a piezoelectric bimorph, first to third stoppers, and M + N + P adjusting bolts. During operation, by exciting the first piezoelectric vibrator and the second piezoelectric vibrator, the excitation of the top plate generates a composite motion in the vertical and horizontal directions; the material placed in the top plate moves obliquely forward under the composite vibration. When the material reaches the apex, the top plate moves back. At this time, the material continues to move forward in a parabola and falls due to inertia; when the material falls onto the top plate, the top plate starts the next cycle of composite vibration, and under this cyclic motion, the transportation of the material on the top plate can be realized. The structure of the present invention is simple, easy to process and assemble, and can transport in both directions.

The present invention discloses a distributed flexibility flapping wing drive mechanism and its design method, belonging to the technical field of flapping wing aircraft. The distributed flexibility flapping wing drive mechanism includes a flapping wing drive mechanism mounting frame, a piezoelectric bimorph driver and a distributed flexibility transmission chain arranged on the flapping wing drive mechanism mounting frame; the distributed flexibility transmission chain includes a pair of vertical elastic sheets and a horizontal elastic sheet, and the distributed flexibility transmission chain has two flapping arms and a flapping transmission part; the fixed end of the piezoelectric bimorph driver is fixed at the rear end of the distributed flexibility transmission chain; the method includes a. simplifying the piezoelectric bimorph driver into an equivalent single-degree-of-freedom second-order linear vibration system; b. simplifying the distributed flexibility transmission chain into an equivalent "multi-rigid body - torsion spring" system; c. obtaining the aerodynamic drag and moment of the flapping wing; d. performing model assembly; e. establishing a forced vibration equation set; f. taking the objective function of the optimization problem; g. optimizing the design. It has the characteristics of long working life and high flight efficiency.

The application discloses a hollow type rotary piezoelectric motor and a working method thereof, and the motor comprises a rotor, a first bearing, a second bearing, a shell, a base, a stator and a piezoelectric driving module; the stator comprises a fixing ring, three fixing bases, three connecting rods and three driving feet; the piezoelectric driving module comprises six driving units, and each driving unit comprises two piezoelectric bimorphs; the rotor realizes bidirectional super-high-precision positioning rotary motion by controlling the time sequence and frequency of the six driving units, and can realize large torque at low speed and high-precision rotation at high speed; the application has high reliability, large output torque and high precision, and can be widely applied in the fields of precision optics, aerospace, mechanical manufacturing and medical devices.

The invention relates to a flotation electrical logging mechanical testing system and characterization method based on a piezoelectric bimorph sensor, belongs to the technical field of sensitive force testing, and solves the problem that synchronous measurement of particle and bubble / liquid drop micro-interface acting force and transient contact behavior in the flotation process cannot be realized in the prior art. The method comprises the following specific steps: collecting flotation interface electric signals in the process that bubbles or liquid drops are pressed in and far away from sample particles in real time by utilizing a piezoelectric bimorph sensor, and recording images of contact line behaviors in the process by utilizing a visual unit; performing dynamic accumulation compensation based on a pre-calibrated time parameter for compensating charge leakage and the flotation interface electric signal at each sampling moment, and combining a pre-calibrated sensitivity coefficient to obtain a flotation interface micro acting force at the corresponding sampling moment; and performing data synchronous characterization based on the flotation interface micro acting force and the image to realize in-situ association of the acting force-displacement-contact behavior of the flotation interface.

A piezoelectric vibration energy harvester includes: a first support plate, a second support plate, a piezoelectric bimorph cantilever, a rolling part, a printing raceway, a preloading spring and a bottom plate, the first and second support plates are vertically disposed on the bottom plate, two ends of the piezoelectric bimorph cantilever are respectively connected with the first support plate and the rolling part, an end of the preloading spring is fixed on the second support plate, another end of the preloading spring is movably connected with a back surface of the printing raceway, and a surface opposite to the back surface of the printing raceway is in contact with and coupled with the rolling part. The printing raceway can be obtained by programming the number and initial positions of static equilibrium points, and a multi-stable piezoelectric energy harvester with symmetric or asymmetric potential energy well can be realized.

The application discloses a kind of laser scanning cutting endoscope robots based on carbon fiber paper micro-vibration mirror, the endoscope robot is fixedly installed with paper transmission structure in one end of support structure, and the other end is fixedly installed with GRIN lens;Fixed mirror, X galvanometer and Y galvanometer are fixedly installed in paper transmission structure, and optical path is formed by optical fiber, GRIN lens, fixed mirror, X galvanometer and Y galvanometer;First piezoelectric bimorph driver and second piezoelectric bimorph driver are piezoelectric bimorph driver installed between support structure and paper transmission structure;First piezoelectric bimorph driver is used to drive X galvanometer to rotate around Y axis and / or by paper transmission structure;Second piezoelectric bimorph driver is used to drive Y galvanometer to rotate around Z axis by paper transmission structure.The above-mentioned endoscope robot is compact, light, stable in motion and has excellent dynamic performance by using piezoelectric bimorph driver and paper transmission structure.

The invention discloses a buoyancy-adjustable amphibious bionic manta ray robot based on piezoelectric driving, and belongs to the technical field of underwater robots, the amphibious bionic manta ray robot comprises a shell, the shell comprises a manta ray-shaped shell and a belly armor, and piezoelectric bimorph fixing plate mounting holes are symmetrically formed in the two side faces of the belly armor; the piezoelectric bimorph fixing plate mounting hole is connected with a driving assembly through a bolt, a base mounting groove is formed in the belly armor, a power assembly is mounted in the base mounting groove, and the power assembly is connected with an adjusting assembly. According to the buoyancy-adjustable amphibious bionic manta ray robot based on piezoelectric driving, excitation signals with different phase differences are applied to the adjacent piezoelectric bimorphs, so that the piezoelectric bimorphs vibrate in sequence, and movement in water is achieved; the same excitation signals are applied to the piezoelectric bimorph, so that the piezoelectric bimorph vibrates in a reciprocating mode, land movement is achieved, the structure is simple, the driving efficiency is high, underwater efficient propelling is achieved, land movement is considered, and the robot has the buoyancy adjusting function and can achieve rapid rising and floating and precise hovering.

The application discloses a rotary piezoelectric motor based on three-phase driving and a working method thereof, and the motor comprises a rotor, a first bearing, a second bearing, a shell, a base, a stator and a piezoelectric driving module; the stator comprises a fixing ring, three fixing bases, three connecting rods and three driving feet; and the piezoelectric driving module comprises three piezoelectric bimorphs. The rotor realizes bidirectional super-high-precision positioning rotary motion by controlling the time sequence and frequency of the three piezoelectric bimorphs, and can realize large torque at low speed and high-precision rotation at high speed. The application adopts macro-micro fusion design, can work in non-resonance mode and resonance mode, has high reliability, large output torque and high precision, and can be widely applied in the fields of precision optics, aerospace, mechanical manufacturing and medical instruments.

The application discloses a kind of linear feeding device and method based on piezoelectric transducer inertia drive, feeding device includes base, first to fourth spring piece, first to second connecting block, piezoelectric transducer, top disc, piezoelectric bimorph, first to third stop piece, and M+N+P adjusting bolts;When working, sine excitation signal is applied to piezoelectric transducer, the second order longitudinal vibration mode of piezoelectric transducer can be excited, to induce the reciprocating bending vibration of spring piece, drive top disc to generate horizontal and vertical direction movement.Material placed in top disc moves forward and upward with top disc in material groove.When spring piece moves to limit position, elastic potential energy stored in spring piece drives top disc to move back, at this time, material continues to move forward and falls under the action of inertia in parabolic curve.Under this periodic motion, the transportation of material in top disc is realized.The application has simple structure, and is easy to process and assemble.

The present invention discloses a linear vibration feeding device driven by a sandwich-type piezoelectric and its working method. The device includes a base, first to fourth spring pieces, first to second connecting blocks, first to second piezoelectric transducers, first to second brackets, a top plate, a piezoelectric bimorph, first to third stoppers, and M + N + P adjusting bolts. During operation, by applying a sinusoidal excitation signal to the first and second piezoelectric transducers, the first-order longitudinal vibration modes of the first and second piezoelectric transducers can be excited, inducing reciprocating bending vibrations of the third and fourth spring pieces, driving the top plate to generate displacements in the horizontal and vertical directions, causing the material to generate displacements in the horizontal and vertical directions under the action of friction. When the top plate reaches the limit position and moves back, the material continues to generate a horizontal displacement in a parabolic shape and fall due to inertia, achieving a single movement. Under the periodic movement of the reciprocating swing of the top plate, the material is continuously transported. The structure of the present invention is simple and easy to process and assemble.

The application discloses a rotary inertial drive piezoelectric vibration feeding device, which comprises a top disc, a material disc, a mass block, a bottom disc and N driving units; the driving unit comprises a piezoelectric bimorph, a connecting block, a gasket, a first spring sheet and a second spring sheet; the material disc and the top disc are coaxially fixedly connected; the N driving units are circumferentially and uniformly arranged between the top disc and the bottom disc and are all connected with the mass block. When working, a specified sinusoidal alternating current signal is applied on the piezoelectric bimorph, the piezoelectric bimorph generates bending vibration, drives the spring sheet to vibrate, and then excites the composite vibration mode of the vertical direction and the torsional direction of the top disc. Under the action of inertia and friction, the material in the material disc can be transported in the specified direction; the amplitude of the top disc and the frequency of the whole machine can be adjusted by changing the volume of the mass block, and the mass block can improve the amplitude of the top disc, reduce the vibration transmitted to the base and improve the stability during the material transportation.

The invention provides a multi-mode mixed motion bionic fish based on a piezoelectric bimorph assembly and a control method of the multi-mode mixed motion bionic fish. The bionic fish comprises a bionic fish head, a plurality of motion plates, the piezoelectric bimorph assembly, a plurality of bionic fish shells, a bionic fish tail plate and a fish head cylindrical pin. The bionic fish skeleton comprises a bionic fish head, a bionic fishplate, a plurality of moving plates and piezoelectric crystal plates which are symmetrically adhered to the bionic fish head, the bionic fishplate and the plurality of moving plates, and the bionic fish head, the plurality of moving plates and the bionic fishplate can rotate relatively; according to the bionic fish position closed-loop control method, a bionic fish skeleton is changed into a driving part formed by hinging four sections of motion plates bonded with piezoelectric bimorphs, and the motion posture and the swimming speed of the bionic fish are controlled by controlling the excitation voltage and the excitation frequency applied to the piezoelectric bimorphs; precise control over the position of the bionic fish is achieved, and the bionic fish has the advantages of being high in control precision, adaptability and propelling efficiency, good in expansibility, easy to assemble and the like.

The invention discloses a finite element simulation analysis method for a bimorph permanent magnet mechanical antenna, and belongs to the technical field of antenna design and simulation. The method comprises the following steps: S1, establishing a three-dimensional model comprising a piezoelectric bimorph, a permanent magnet and a background air domain; s2, endowing each component with corresponding material attributes; s3, configuring a solid mechanical field, a magnetic field and a dynamic grid physical field, and setting boundary conditions and excitation; s4, activating piezoelectric effect multi-physical field coupling to realize electricity-force-magnetism indirect coupling; and S5, through transient and steady state analysis solution, outputting vibration mode and radiation magnetic field distribution. According to the method, the working mechanism of the antenna is accurately simulated through high-fidelity multi-physics field coupling simulation, high-cost entity trial-manufacture is effectively replaced, the research and development period is remarkably shortened, and a reliable basis is provided for optimization design of the low-frequency mechanical antenna.

The application discloses a pre-pressure controllable piezoelectric bimorph deformation wing based on a flexible hinge parallel connection and a method. The deformation wing mainly comprises four layers of piezoelectric composite bimorphs fixed at a leading edge, the two sides of the four layers of bimorphs are short and the middle is long, and the four layers of bimorphs are connected in parallel through four interlayer connecting rib structures; the third group of interlayer connecting rib structures are provided with protruding shafts at positions corresponding to the two sides of the rotation shafts of the uppermost and lowermost piezoelectric composite bimorphs, bearings and prefabricated clamping groove bearing sleeves are sleeved on the protruding shafts, polymer spiral winding actuators fixed at the leading edge are sleeved on the bearing sleeves to load and unload axial pressure; one of the two middle layers of longer bimorphs is fixedly connected with a trailing edge, and the other layer can slide in a prefabricated slot at a tail edge; finally, upper and lower skins are fixed with upper and lower sides of a large end of the leading edge, four groups of ribs and upper and lower sides of a large end of the trailing edge in sequence. The application can greatly improve the output power of the pre-compressed piezoelectric bimorph deformation wing and prolong the service life of the piezoelectric bimorph deformation wing.

The present invention discloses an ultra-thin piezoelectric ceramic motor comprising a piezoelectric bimorph comprising an upper piezoelectric ceramic sheet and a lower piezoelectric ceramic sheet, with a metal substrate disposed between the upper and lower piezoelectric ceramic sheets. A FPCB with electrodes is disposed on both the upper and lower surfaces of the metal substrate. The electrodes of the upper and lower piezoelectric ceramic sheets align with the electrodes of the FPCB to achieve electrical interconnection. A mass block is disposed on one side of the piezoelectric bimorph, fixedly connected to the metal substrate, with a gap between the mass block and both the upper and lower piezoelectric ceramic sheets. This invention provides a piezoelectric ceramic motor with high acceleration and ease of installation, eliminating the influence of the rigidity of the piezoelectric ceramic motor's mounting structure on its vibration and expanding the application range of ceramic motors.

The present invention discloses a hollow rotary piezoelectric motor based on six-phase drive and its operating method. The motor comprises a rotor, a first bearing, a second bearing, a housing, a base, a stator, and a piezoelectric drive module. The stator comprises a fixed ring, three fixed seats, three connecting rods, and three drive feet. The piezoelectric drive module comprises six piezoelectric bimorphs. By controlling the timing and frequency of the six piezoelectric bimorphs, the present invention enables the rotor to achieve bidirectional, ultra-high-precision rotational motion, enabling high torque at low speeds and high-precision rotation at high speeds. The present invention has high reliability, high output torque, and high precision, and can be widely used in fields such as precision optics, aerospace, mechanical manufacturing, and medical equipment.

The embodiment of the invention relates to the technical field of piezoelectric bimorph testing, in particular to a load-based piezoelectric bimorph displacement measuring device and method. A load-based piezoelectric bimorph displacement measuring device comprises a load assembly connected with a piezoelectric bimorph to be measured and a base platform connected with the load assembly. The load assembly comprises a fixed pulley; the top of the fixed pulley mounting frame is connected with the fixed pulley, and the bottom of the fixed pulley mounting frame is connected with the base platform; the inelastic cord is wound on the fixed pulley, and a first cord end of the inelastic cord is connected with the piezoelectric bimorph to be tested; and the load body is connected with the second rope end of the inelastic rope. The load assembly provided by the embodiment of the invention can instantly load the load force to the piezoelectric bimorph to be tested and ensure that the load force does not change along with the output displacement change of the piezoelectric bimorph to be tested, thereby improving the accuracy of the test result of the displacement characteristic test of the piezoelectric bimorph.

The invention discloses a laser scanning cutting endoscope robot based on a carbon fiber paper folding micro galvanometer. According to the endoscope robot, a paper folding transmission structure is fixedly installed at one end of a supporting structure, and a GRIN lens is fixedly installed at the other end of the supporting structure; the fixed mirror, the X galvanometer and the Y galvanometer are fixedly installed on the paper folding transmission structure, and an optical path is formed by the optical fiber, the GRIN lens, the fixed mirror, the X galvanometer and the Y galvanometer. The first piezoelectric bimorph driver and the second piezoelectric bimorph driver are both mounted between the supporting structure and the paper folding transmission structure; the first piezoelectric bimorph driver is used for driving the X galvanometer to rotate around the Y axis through the paper folding transmission structure and / or driving the X galvanometer to rotate around the Y axis; the second piezoelectric bimorph driver is used for driving the Y galvanometer to rotate around the Z axis through the paper folding transmission structure. According to the endoscope robot, the piezoelectric bimorph driver and the paper folding transmission structure are adopted, so that the overall structure is small and light, movement is stable, and the excellent dynamic performance is achieved.

This invention discloses a two-dimensional laser scanning galvanometer device based on piezoelectric bicrystalline wafer driving, belonging to the field of piezoelectric driven scanning galvanometer technology. It includes a base with a circular hole on its side wall. A laser emitting device, partially penetrating the interior of the base, is installed through this hole. A first deflecting lens group is mounted on the side of the base. Below the first deflecting lens group, a second deflecting lens group is fixed to the base and perpendicular to it. A top cover is mounted on the top of the base. This invention, employing the aforementioned two-dimensional laser scanning galvanometer device based on piezoelectric bicrystalline wafer driving, solves the problems of dynamic performance contradictions, thermal drift, and reliability limitations inherent in existing electromagnetically driven scanning galvanometers. It fundamentally achieves high-bandwidth, low-heat-dissipation, and wear-free precision beam scanning. Furthermore, it is compact, portable, and low-cost, making it suitable for mass production and widespread civilian application.

The invention discloses a piezoelectric bicrystal cantilever beam valveless ultrasonic air pump array working in a second-order mode, and belongs to the technical field of valveless piezoelectric air pumps, the piezoelectric bicrystal cantilever beam valveless ultrasonic air pump array adopts a lamellar structure, and comprises a cantilever beam combination plate positioned in the middle, and fixed plates, a Tesla flow channel inner layer plate and a Tesla flow channel outer layer plate which are symmetrically and fixedly connected to the upper side and the lower side of the cantilever beam combination plate in sequence; a plurality of pairs of piezoelectric bicrystal cantilever beams are symmetrically arranged on the left side and the right side of the cantilever beam combination plate, and I-shaped inner partition plates are arranged at the adjacent positions of the piezoelectric bicrystal cantilever beams. The front end and the rear end of the pump body are fixedly connected in a sealed mode through outer partition plates to form multiple pairs of pump cavities which are bilaterally symmetrical and do not interfere with each other. Adjacent structures of the Tesla runner outer layer plates and the Tesla runner inner layer plates on the same side form a plurality of pairs of Tesla runners; and the Tesla flow channel is outwards communicated with the flow inlet and is inwards communicated with the upper side or the lower side of the pump cavity through the pump cavity flow inlet hole. In conclusion, rapid suction and discharge of fluid can be achieved, and the heat dissipation device can be applied to the field of heat dissipation of precision machinery.