751 results about "Bending vibration" patented technology

A small-sized, low-profile fluid pump having high pumping capabilities includes an actuator and a planar section including a metal plate. The actuator includes a disk-shaped piezoelectric element attached to a disk-shaped diaphragm. As a result of application of a square-wave or sine-wave drive voltage, the actuator performs a bending vibration from the central portion to the peripheral portion. The peripheral portion of the actuator is not restrained. The actuator performs a bending vibration in the state in which it is in proximity to the planar section while facing the planar section. A center vent is provided at or in an area adjacent to the center of an actuator facing area of the planar section that faces the actuator.

The linear ultrasound electrical motor (LUEM) includes drive oscillator, mover, chassis, and relevant locking gear for fastening them. The drive oscillator includes piezoelectric element and metal elastic body (MEB). The piezoelectric element includes piezoelectric ceramic piece (PCP) of bending vibration, and PCP of longitudinal vibration in use for generating rectilinear vibration. At least one dogtooth contacted to mover is setup on MEB. Slider of guiding bulge is setup on side of mover. The guiding bulge is corresponding to straight-line guidance groove setup on the chassis. The disclosed LUEM is longitudinal and bending composite driving LUEM with prism type oscillator. The drive oscillator is prism type longitudinal bending composite oscillator composed of connection terminals, longitudinal vibration rectangular PCP and front cover board fastened by double end bolts and nuts. The oscillator is as stator of LUEM to generate longitudinal and bending vibration.

A vibrator of a vibratory gyroscope comprises a main arm having a base part and at least one bending-vibration piece extending from the base part in a direction crossing the longitudinal direction of the base part and a fixing part for fixing one end of the base part, and the base part and the bending-vibration piece are formed so as to extend substantially in a specified plane. Preferably, at the opposite side to one end of the base part, a projection projecting from the bending-vibration piece is provided, or at least a pair of resonant arms resonating with vibration of the base part, said pair of resonant arms projecting from the fixing part are provided. Thanks to this, it has been possible to detect a turning angular rate in a sufficiently high accuracy without providing a projection which has a certain weight and extends from the vibrator toward the axis of turning even in case of arranging the vibrator so that the vibration arm of the vibrator extends perpendicularly to the axis of turning.

A vibrator for generating a signal for measuring a physical quantity using a vibrator is provided, including at least one bending vibration arm vibrating in bending mode along a specified plane and having a first end, an opposed second end, and first and second main faces that are substantially parallel with each other. A base portion is provided at the first provided at the first end of the bending vibration arm, a weight portion is provided at the second end of the bending vibration arm, and grooves are formed on the first and second main faces. The vibrator further includes driving means for exciting a driving vibration in the vibrator, and detecting means provided on one of the bending vibration arms for detecting an output signal based on detection vibrations induced in the vibrator responsive to the physical quantity to be measured.

The invention relates to a piezoelectric generator collecting energy of bending vibration and pertains to the technical field of piezoelectric generators. The piezoelectric generator of the invention is characterized by the adoption of a three-layer structure with two cantilevered piezoelectric ceramic layers and a metal layer, namely, the upper layer and the lower layer of the piezoelectric generator are piezoelectric ceramic layers (1, 2), the polarization direction of which are opposite; the piezoelectric ceramic layers are respectively stuck with a metal layer (3) in the middle by conductive adhesive layers (4, 5) and electrode surfaces (6, 7) of the piezoelectric ceramic layers (1, 2) are connected with a power circuit with functions of rectification and energy collection by conducting wires (8, 9); the metal layer (3) at a fixed end of a piezoelectric device stretches outside the piezoelectric ceramic layers (1, 2) and the piezoelectric device is fixed through the metal layer (3) at the fixed end. The piezoelectric generator of the invention has the advantages of fast responding, low cost, simple structure, no heat emission, and no consumption of any material during operation, etc., and the piezoelectric generator meets the requirement of saving energy and has obvious commercial and social values.

The invention discloses a bending-twisting conversion type ultrasonic torsion vibration transducer which comprises a bending-twisting vibrating body(1), a drive component (2) and a back cover (3) of the transducer; the drive component (2) is arranged between the bending-twisting vibrating body(1) and the back cover (3) of the transducer, and moreover, an A pretighting bolt (33) passes through the through hole of an A end cover (31), an A through hole (22) and an A pretighting screw hole (121) in turn through to arrange the A end cover (31) and an insulating block (21) on the A top surface (107) of the bending-twisting vibrating body(1); an B pretighting bolt (34) passes through the through hole of an B end cover (32), an B through hole (23) and an B pretighting screw hole (151) in turn to arrange the B end cover (32) and the insulating block (21) on the B top surface (108) of the bending-twisting vibrating body(1). A pair of bending vibrations with the same frequency swings and opposite vibrating directions generated by corresponding two groups of piezoelectric ceramics drive elements are amplified and transmitted to a converter by two bending arms; two bending vibrations are coupled and converted into a coupling torsion vibration (63) through a mode converter; a torsion vibration (64) is obtained and output after being amplified by an amplitude transformer (101), thus obtaining ultrasonic torsion vibration by a simpler mode.

A vibrator of a beam type linear ultrasonic motor using bending vibration modes belongs to the technical field of piezoelectric ultrasonic motors and is used for the piezoelectric ultrasonic motors. The vibrator solves the problem that the mechanical output capabilities of the ultrasonic motors are restricted because of low tensile strength and low electromechanical coupling efficiency of ceramic materials in the prior art. The vibrator comprises two driving pads, two end covers, two insulating sleeves, two pairs of piezoelectric ceramics with polarization directions being thickness directions, a flange, two thin-walled beams and mounting bases; wherein, studs extend out from the end faces of the flange along the axis of the flange; each stud is sleeved with a pair of piezoelectric ceramics; an end cover is screwed at the overhanging end of each stud; the tail end of each end cover is provided with a driving pad; each piezoelectric ceramic is composed of two symmetrical half piezoelectric ceramics which are combined after being split; the polarization directions of the two half piezoelectric ceramics are opposite; the splitting lines of the two pairs of piezoelectric ceramics at both sides of the flange are vertical to each other; the polarization directions of the piezoelectric ceramics in each pair are opposite.

The invention discloses a screw-thread-driven rotary-linear ultrasonic motor using a columnar stator high-order bending vibration mode, which belongs to the technical field of ultrasonic motors and is used for solving the problem of small output torque during miniaturization of a screw-thread-driven rotary-linear ultrasonic motor using the columnar stator high-order bending vibration mode. The screw-thread-driven rotary-linear ultrasonic motor comprises a screw thread output shaft, a metal tube elastic sleeve and m groups of piezoelectric ceramic sheets, or comprises a screw thread output shaft, a piezoelectric ceramic tube, two metal caps and p groups of outer electrodes. Two mutually orthogonal high-order bending vibrations such as two-order or three-order bending vibration modes on a free stator space are excited, driving travelling waves are generated on the inner surface of a stator driving end consisting of the metal tube elastic sleeve and the m groups of piezoelectric ceramic sheets by laminating and coupling the vibrations, and a stator and the screw thread output shaft are driven through a screw thread pair, so that rotary-linear motion output of the output shaft is realized under the action of axial loading force. The screw-thread-driven rotary-linear ultrasonic motor is taken as a rotary-linear ultrasonic motor.

The invention discloses a flexible cantilever slab vibration detection device and method based on binocular vision. The detection device comprises a left CCD camera and a right CCD camera. One end of a flexible cantilever slab is the fixed end, and one end of the flexible cantilever slab is the free end. A first resistance strain gauge sensor and a second resistance strain gauge sensor are pasted on the flexible cantilever slab. Matts are drawn in the front of the flexible cantilever slab. The first resistance strain gauge sensor and the second resistance strain gauge sensor detect bending vibration and torsion information of the flexible cantilever slab. After being amplified through a charge amplifier, analog signals are converted into digital signals through an A/D conversion card, then the digital signals are input into a computer, the left CCD camera and the right CCD camera provided with lenses detect the vibration information of the matts in the front of the flexible cantilever slab and transmit the vibration information to the computer, double CCD camera sensors are utilized for solving three-dimensional coordinates of line intersection points of the matts on the cantilever slab according to the parallax principle, and therefore the vibration information of the points can be obtained. Accordingly, the bending and torsion vibration information of the cantilever slab can be obtained.

A piezoelectric vibrator includes: a flat plate piezoelectric element, the piezoelectric vibrator vibrating in a mixed mode of stretching vibration that generates a displacement in a first direction within a plane of the piezoelectric element and a bending vibration that generates a displacement in a second direction orthogonal to the first direction; a vibrating member provided with the piezoelectric element and vibrated by applying voltage on the piezoelectric element; a support member provided on the vibrating member to support the vibrating member in a vibratable manner the support member being provided on an outer edge of the vibrating member at a position adjacent to anti-node other than free end of the bending vibration, the support member including a first support section extending in a direction approximately orthogonal to the first direction and a second support section extending in a direction approximately orthogonal to the direction in which the first support section extends; and a fixing portion provided on the support member to be fixed on an object on which the piezoelectric vibrator is attached.

A piezoelectric power generator including a resonator having a first weight member supported on a base member by a spring; a second weight member; and a generating device having a vibrating plate with a piezoelectric element attached to a surface thereof. Further, the vibrating plate has one end secured to the first weight member and the other end being a free end attached to the second weight member. The generating device is capable of bending and vibrating in an up-and-down direction, such that the first weight member can swing at a predetermined frequency about an axis perpendicular to a bending vibration plane of the generating device.

The invention discloses a vibration measurement and control device and method of a rotary flexible hinge beam. The vibration measurement and control device comprises a flexible hinge beam body portion, a vibration signal detecting portion and a driving control portion. The flexible hinge beam is formed by connecting two beams through a hinge, and a prestretching shape memory alloy wire is arranged between the two beams, and is used for restraining low-frequency large-amplitude bending vibration of the connecting position. A piezoelectric ceramic piece sensor and a piezoelectric ceramic piece driver are pasted on to the front face and the rear face, close to a mechanical tightening device, of the flexible hinge beam respectively, and are used for detecting and restraining the bending vibration of the hinge beam. An acceleration sensor used for detecting vibration is arranged at the tail end of the hinge beam. The device is used for simulating vibration measurement and control over a space flexible joint and a flexible mechanical arm, the sensors and the composite control drivers are adopted, the corresponding control algorithm is operated, and active control over the bending vibration of the rotary hinge flexile beam is achieved.

The invention discloses a piezoelectric ceramic ultrasonic atomizing sheet, comprising a piezoelectric ceramic sheet group and a metal sheet group, wherein the piezoelectric ceramic sheet group consists of at least two piezoelectric ceramic sheets, and the metal sheet group consists of at least one metal sheet. In the piezoelectric ceramic sheet group, through holes are arranged on the piezoelectric ceramic sheets; the piezoelectric ceramic sheets and the metal sheets are mutually crossed and overlapped; and the metal sheets cover the through holes entirely. The piezoelectric ceramic ultrasonic atomizing sheet disclosed by the invention is in a multilayer clamping structure, the metal sheets and the piezoelectric ceramic sheets have high bonding strength and are difficult to fall of, so that the metal sheets of one atomizing sheet are combined in various vibration modes, namely axial bending vibration and radial stretching vibration, is realized. Therefore, the vibration modes of the atomizing sheet with the structure are increased and the atomizing effect range of the atomizing sheet is widened.

A piezoelectric electroacoustic transducer includes a substantially rectangular piezoelectric diaphragm having an internal electrode, a plurality of laminated piezoelectric ceramic layers having the internal electrode interposed between two of the piezoelectric ceramic layers, principal-surface electrodes disposed on top and bottom principal surfaces of the piezoelectric diaphragm, the piezoelectric diaphragm generating surface bending-vibrations in response to application of an alternating signal between the principal-surface electrodes and the internal electrode, a resin film that is larger than the piezoelectric diaphragm and having the piezoelectric diaphragm affixed onto substantially a central portion of a front surface thereof, and a housing having a support for supporting the outer periphery of the resin film. The resin film has heat resistance at least a reflow-soldering temperature and at least one undulated portion bending in the front and rear directions thereof and formed in the outer periphery thereof, and the perimeter of the resin film including the four corners thereof is fixed to the support of the housing by adhesion.

The invention provides a piezoelectric actuator and a piezoelectric motor. The piezoelectric actuator comprises a piezoelectric body which is of a square platy structure and is polarized in the thickness direction. A first electrode layer is arranged on a main plane of a first end of the piezoelectric body in the thickness direction, a second electrode layer is arranged on a main plane of a second end of the piezoelectric body in the thickness direction, the first electrode layer comprises a plurality of electrode areas, and the second electrode layer comprises at least one electrode area. The piezoelectric actuator can work in a simple first-order bending vibration mode, generates reciprocating straight-line trajectory movement or elliptical orbit movement, is simple in structure and convenient to manufacture, and can solve problems which exist in a traditional piezoelectric actuator.

A vibration device comprising; a vibrator which generates bending vibration on a predetermined member, a controller which controls a driver to drive the vibrator, wherein; the vibrator comprises a plurality of driving electrodes electrically insulated respectively, the controller controls the driver to make phases of driving signals respectively output to the plurality of driving electrodes changeable relatively and adjust an order of the bending vibration.

The invention relates to an ultrasonic bending fatigue experimental device, wherein a transducer is positioned in a force transmitter and connected with a connector. The transducer is positioned in the middle of the ultrasonic bending fatigue experimental device; a backing plate and an upper connecting plate as well as a lower connecting plate of the force transmitter are fixedly connected through force transmitting rods. One end of the connector penetrates through the lower connecting plate at the lower end of the force transmitter and is connected with a displacement amplifier, and the other end penetrates through the upper connecting plate and is connected with the transducer. A supporting device is positioned below the displacement amplifier; and a static load force applying device penetrates through the central hole of the backing plate and is fixedly connected with the backing plate. The transducer, the connector, the displacement amplifier and a pressure head form a longitudinal resonance system, and a longitudinal vibration load is transferred to a bending fatigue sample through the pressure head, so that bending vibration is generated by the bending fatigue sample. The position of the supporting point of the bending fatigue sample can be automatically regulated through a positioning guide screw to realize an ultrasonic bending fatigue experiment, the ultrasonic bending fatigue experiments of the samples with different loading loads and different geometrical sizes can be realized, and the ultrasonic bending fatigue experimental device is suitable for carrying out the bending fatigue experiment by utilizing an axial loading ultrasonic fatigue experiment machine.

The invention relates to a piezoelectric fiber containing a metal core with part coated with an electrode, which comprises a metal core (1), a piezoelectric material (2) coating the metal core (1) and a coating electrode (3) coating the outer surface of the piezoelectric material (2). The surface of the piezoelectric material (2) comprises an electrode coated part (3) and a non electrode coated part (4); the electrode coated part (3) is a coated electrode (31) which partially covers the surface of the piezoelectric material (2) along the extending direction of the piezoelectric fiber containing a metal core. The piezoelectric fiber containing a metal core with part coated with electrode of the invention can realize the driving functions of driving components such as traditional piezoelectric bimorphs, can be used as micro-drivers and for energy recycling and vibration control, and especially can realize the function of bending vibration, thus overcoming the application disadvantages of the existing piezoelectric fibers.