223 results about "Flexural vibration" patented technology

The invention relates to an elliptical ultrasonic vibration auxiliary cutting device with an adjustable track, which consists of a transducer, an amplitude transformer and a cutter, wherein the transducer adopts a basic structure of a longitudinal vibration sandwiched piezoelectric chip, has revolution asymmetric characteristic structures of an overlapping structure of semicircular ring-shaped piezoelectric ceramic chips and electrode chips separately, an off-axis type catenary variable-amplitude structure and the like, and initiates and strengthens flexural vibration when longitudinal vibration is output; the amplitude transformer is a cylindrical bar with uniform cross sections, and a relative angle between the amplitude transformer and a front cover plate is adjustable; and the cutter is installed in an offset way in the radial direction at the tail end of the amplitude transformer, and the offset degree can be adjusted. The working frequency of the invention is higher than 20kHz and can better achieve the ultrasonic machining effect; the elliptical cutting track is long, the minor axis proportion is reasonable, so that the advantages of elliptical cutting can be fully used; the elliptical track can be adjusted to better adapt to machining of different machining materials and different cutting consumption; and single-point diamond ultraprecise cutting can be hopefully expanded to machining of iron-based materials and optical crisp and hard materials.

In an electronic apparatus having a touch panel, four fixing cushions are fixed at four corners of a rear surface of the touch panel. The fixing cushions are further fixed to a fixing frame to support the touch panel against to the fixing frame. Pair of vibrating elements are fixed to the rear surface of the touch panel along edges, which are parallel to each other, of the touch panel. The vibrating elements elastically bend the touch panel to cause flexural vibration to the touch panel. The fixing cushions have softness to allow the touch panel to vibrate and hardness to serve as fulcrums of the flexural vibration of the touch panel.

A piezoelectric resonator element includes: a resonating arm extending in a first direction and cantilever-supported; a base portion cantilever-supporting the resonating arm; and an excitation electrode allowing the resonating arm to perform flexural vibration in a second direction that is orthogonal to the first direction. In the piezoelectric resonator element, the resonating arm includes an adjusting part adjusting rigidity with respect to a bend in a third direction that is orthogonal to the first and second directions.

A linear ultrasonic motor of sandwich transducer type with FM variable - amplitude rod is prepared as firm-connecting longitudinal-flexural vibration piezoelectric ceramic wafer and thin copper plate with big end of end cover through double-screw bolt and small end of end cover to big end of FM variable - amplitude rod through driving foot, arranging said driving foot and flexural vibration piezoelectric wafer separately at vibration wave loop of flexural vibration for setting polarization directions of flexural and longitudinal vibration piezoelectric ceramic wafer and setting length of variable-amplitude rod to be 1/2 of longitudinal vibration wavelength.

A structure of a rectangular panel-form loudspeaker is provided. The structure includes a radiating panel, a transducer, a frame and a suspending unit. The radiating panel includes a rectangular laminated composite plate with length b and width a, and the laminated composite plate includes an intermediate core layer sandwiched between two fiber-reinforced polymeric layers. The transducer is used for exciting the radiating panel to produce flexural vibration. The transducer includes a voice coil assembly and a magnet assembly, wherein the voice coil assembly is coupled to a first side of the laminated composite plate at a first specified location. The frame is used for positioning the laminated composite plate and the magnet assembly. The suspending unit is made of a soft material and disposed between peripheral edges of the laminated composite plate and the frame.

The invention relates to a ring-type multi-degree-of-freedom ultrasonic motor and an electric excitation method, pertaining to the field of ultrasonic motors. The ultrasonic motor comprises a rotor and a stator. The invention is characterized in that the rotor is a spherical rotor (1); the stator is a metal ring (2), and six piezo-electric ceramic pieces (3) are affixed on the flank of the ring stator; three upper bosses (4) are evenly distributed on the periphery of the upper end-face of the ring stator and arranged at the same position of the platform (6) affixed with ceramic pieces to support and drive the spherical stator; the rotor provides the prepress force required by the stator and the rotor; three small bosses (4) corresponding to the positions of the upper bosses (4) are also arranged on the lower end-face of the ring stator to support the whole motor. When the driving signal provides power supply to any two piezo-electric ceramic pieces (3) opposite to each other, the two flexural vibration modes in the face of the stator can be excited out to produce standing waves and drive the spherical rotor to round the spherical center of the rotor and rotate around the axial line parallel with the two piezo-electric ceramic pieces. The ultrasonic motor can realize the rotation of a plurality of rotating shafts; the invention has the advantages of a simple structure, a small size, high efficiency, reliable operation, etc.

A flexural vibration element includes: a vibration element body composed of a plurality of vibrating arms provided in parallel, a connecting part connecting the vibrating arms, and one central supporting arm extending between the vibrating arms from the connecting part in parallel with the vibrating arms at equal distance from the arms; and a frame body disposed outside the vibration element body. In the flexural vibration element, the vibration element body is supported by the frame body at an end part, which is opposite to the connecting part, of the central supporting arm.

The invention relates to a vibratory stress relief apparatus for medium frequency and low frequency shaft type parts, and a use method thereof. The apparatus comprises a vibration exciter, a support block for clamping and supporting a workpiece, and a support mechanism connected with the support block. The support mechanism comprises a pair of support frames comprising a left support frame and a right support frame, and a support seat for installing the left support frame and the right support frame, wherein the left support frame and the right support frame right are arranged relatively. Thesupport block respectively forms rotatable connections with the left support frame of the support mechanism and the right support frame of the support mechanism. The apparatus further comprises a vibration exciter base for installing the vibration exciter, wherein the vibration exciter base is arranged on the middle portion of the workpiece, the vibration exciter, the vibration exciter base and the workpiece synchronously vibrate during vibratory stress relief. According to the present invention, a simply supported beam form is adopted, the flexural vibration type primary resonance is generated by the shaft type parts under the excitation of the vibration exciter at the natural frequency adopted for shaft flexural vibration; in the prior art, the dynamic stress generated by the apparatus does not reach the requirement of residual stress decreasing, with the apparatus provided by the present invention, the problem in the prior art is solved; the deformation amounts on both ends of the shaft are substantially improved; the dynamic stress distribution of the shaft is uniform so as to effectively reduce the residual stress of the shaft part.

A flexural vibration piece includes: a base portion; and a vibration arm extending from the base portion, wherein the vibration arm has first and second main faces which are arranged to be opposite each other, the first and second main faces respectively have first and second grooves which are formed in the longitudinal direction of the vibration arm, the first groove has a plurality of first groove portions which are divided in the longitudinal direction of the vibration arm and arranged to be alternately shifted on both sides with respect to the longitudinal center line of the vibration arm in the longitudinal direction, the second groove has a plurality of second groove portions which are divided in the longitudinal direction of the vibration arm, and arranged to be alternately shifted on both sides with respect to the longitudinal center line of the vibration arm in the longitudinal direction and on an opposite side to the first groove portions with respect to the longitudinal center line, and a predetermined voltage is applied to first excitation electrodes provided at the first groove and the second groove and second excitation electrodes provided on both side faces of the vibration arm, such that the vibration arm flexural-vibrates in the in-plane direction of the first or second main face.

Provided is a piezoelectric vibrator that can finely drive a device by generating an elliptical motion using a combination of a longitudinal vibration and a flexural vibration. The piezoelectric vibrator can also provide high efficiency and be manufactured at low cost by using a simpler structure. The piezoelectric vibrator includes a piezoelectric element, first to third side electrodes, and a power transmission member. The piezoelectric element includes: a first piezoelectric element layer having a bisected top electrode formed thereon; a second piezoelectric element provided under the first piezoelectric element layer and having an internal ground electrode formed thereon; and a third piezoelectric element provided under the second piezoelectric element layer, the third piezoelectric element having an internal electrode symmetrical with the top electrode with respect to a stack plane, and a bottom electrode formed in a plane opposite to the plane where the internal electrode is formed. The first and second side electrodes electrically connect electrode patterns formed in a diagonal direction among the electrode patterns formed in the first and third piezoelectric element layers of the piezoelectric element, and the third side electrode electrically connects the internal ground electrode of the second piezoelectric element layer to the bottom electrode of the third piezoelectric element layer. The power transmission member is formed in one side of the piezoelectric element to transmit vibration generated from the piezoelectric element to the outside.

The transducer (1) has at least one at least temporarily vibrating flow tube (101) of predeterminable lumen for conducting a fluid. The flow tube (101) communicates with a connected pipe via an inlet tube section (103), ending in an inlet end, and an outlet tube section (104), ending in an outlet end, and in operation performs flexural vibrations about an axis of vibration joining the inlet and outlet ends. The flow tube (101) has at least one arcuate tube section (101c) of predeterminable three-dimensional shape which adjoins a straight tube segment (101a) on the inlet side and a straight tube segment (101b) on the outlet side. At least one stiffening element (111, 112) is fixed directly on or in close proximity to the arcuate tube segment (101c) to stabilize the three-dimensional shape. By means of the at least one stiffening element (111, 112), the cross sensitivity of the transducer (1) is greatly reduced, so that cross talks from pressure to mass flow signals are minimized and the accuracy of the transducer is improved.

The invention discloses a deep hole inner surface ultrasonic vibration impact strengthening device and method, and relates to the technical field of deep hole inner surface strengthening treatment devices. The deep hole inner surface ultrasonic vibration impact strengthening device is characterized in that a high-frequency signal generated by an ultrasonic power source is converted by an ultrasonic flexural vibration transducer into flexural mechanical vibration, and an amplitude-change pole after amplifying the vibration amplitude of the high-frequency mechanical vibration at an outlet end ofthe transducer transmits the high-frequency mechanical vibration to an ultrasonic impact head so as to impact inner hole surface of parts. A rotation assist system provides radial rotation for the flexural vibration transducer to achieve higher coverage with a single treatment. The deep hole inner surface ultrasonic vibration impact strengthening device is suitable for strengthening the parts with deep holes and has the advantages of low energy consumption, small size, no pollution in the working field environment and good strengthening effect on the workpiece surface; and the strengthening direction does not need to be limited in the vertical direction, and impact at multiple angles and positions can be achieved; and filling and shot blasting do not need to be repeated during working, and certain practicability is achieved.

A vibrator element has a first vibration mode in which first and second detection portions perform flexural vibration in opposite directions in the opposite phase to first and second driving portions which vibrate in opposite directions according to a Coriolis force, and a second vibration mode in which the first and second detection portions perform flexural vibration in opposite directions in the same phase as the first and second driving portions which vibrate in opposite directions according to a Coriolis force. A ratio r=R2/R1 of equivalent series resistance R2 at the time of the second vibration mode to equivalent series resistance R1 at the time of the first vibration mode is set between 0.15 and 6.0.

The invention discloses a piezoelectric actuator and a liner piezoelectric motor. The piezoelectric actuator comprises at least two piezoelectric chip which are overlapped, wherein each piezoelectric chip has a preset polarization distribution direction, and the surface of each piezoelectric chip is provided with a first driving electrode assembly and a second driving electrode assembly which are matched with the polarization distribution direction of the piezoelectric chip; under the action of driving voltage with a preset characteristic frequency applying to the first driving electrode assemblies and the second driving electrode assemblies, both piezoelectric chip can generate vibration deformation with the same frequency, thus, based on the composite vibration deformation of the two piezoelectric chips, the piezoelectric actuator can integrally generate standing wave harmonic oscillation or traveling wave motion in a first order flexural vibration mode. The piezoelectric actuator provided by the invention has simple structure, is practical and convenient, and can effectively reduce the driving voltage of the piezoelectric actuator and improve the driving force.

In the invention, each piezoelectric element for a vibrator for an ultrasonic motor has electrode regions for exciting stretching vibration and flexural vibration separately. Thus, the invention provides a vibrator for an ultrasonic motor, in which electrodes are provided for applying voltage to each of the polarized region, and further provides a stack-type piezoelectric vibrator for an ultrasonic motor, consisting of a stack of the said vibrators and having an extraction electrode pattern provided for short circuit with an external electrode. The vibrator of the invention has high controllability, especially in a fine movement region and is useful as a driving source in a positioning device, in which enhanced vibration efficiency can be obtained.

A longitudinal and flexural composite transducer type double cylinder-shaped traveling wave ultrasonic motor vibration generator belongs to the technical field of a piezoelectric ultrasonic motor. The invention aims at solving the problems that the mechanical output capacity of an ultrasonic motor is restricted when the method that metal elastic body pastes a piezoelectric ceramic sheet is adopted for excitation by the existing ultrasonic motor vibration generator, vibration path distortion of vibration generator surface particle caused by the condition that multi-transducer can not be guaranteed to be completely consistent when the multi-transducer are adopted to drive simultaneously and the mechanical output capacity and maneuverability of the ultrasonic motor are reduced. The invention comprises a longitudinal and flexural composite sandwich transducer and two cylinders, the small end face of a front end cover of the longitudinal and flexural composite sandwich transducer is made into a whole with a cylinder, the big end face of the front end cover thereof is respectively connected with one end of a screw stud, a longitudinal vibration piezoelectric ceramic plate and a flexural vibration piezoelectric ceramic plate respectively are sheathed on the screw stud with electrode plates in an interval manner, and the other end of the screw stud is connected with a flange. The traveling wave ultrasonic motor vibrator is applicable to the manufacturing field of the ultrasonic motor.

A pump (1) includes a vibrating plate (15) that has a central part (21), a frame part (22), and connecting parts (23 to 26), a piezoelectric element (16) that is stacked over the central part (21) and configured to cause flexural vibrations to occur concentrically from the central part (21) to the connecting parts (23 to 26), and an opposed plate (13) that is stacked over the frame part (22) and positioned facing each of the connecting parts (23 to 26) with a spacing therebetween. The vibrating plate (15) has such a resonant mode that an antinode occurs in each of the central part (21) and the connecting parts (23 to 26). The opposed plate (13) has, at positions facing the connecting parts (23 to 26), a plurality of channel holes (39 to 43) through which a fluid flows.

A driving device that causes a movable body to move stably with minimal backward movement. The driving device includes a plate-shaped driving unit with an elastic body and a piezoelectric element joined to a main surface of the elastic body. Moreover, the movable body is disposed into a cavity of the elastic body and is moved by being pitch fed when the driving unit is driven. The driving unit vibrates with flexural vibration and one more other vibration modes or with vibration of a coupled mode in which the flexural vibration and the other vibration mode are coupled with each other.

The invention discloses a buckling composite modal sandwich type double-foot rotating ultrasonic motor vibrator with elastic supports, and relates to the technical field of piezoelectric ultrasonic motors. The vibrator solves the problem that the vibration energy is utilized insufficiently and the mechanical output capacity is restricted in the conventional ultrasonic motor vibrator. The ultrasonic motor vibrator comprises two amplitude transformation rods, two pairs of flexural vibration piezoelectric ceramic chips, two pairs of longitudinal vibration piezoelectric ceramic chips, a neutral plate, two mounting seats, two thin-wall beams, two insulating bushes, eight electrode plates and two friction plates; the amplitude transformation rods are blocks, the sections of which are rectangular and gradually thinned; the small end faces of the amplitude transformation rods are provided with driving feet; the friction plates are fixed in through slots of the small end faces of the amplitude transformation rods; two ends of the neutral plate are provided with studs; and the amplitude transformation rods are respectively screwed to the ends of the studs through thread holes of the big end faces, so that the flexural vibration piezoelectric ceramic chips and the longitudinal vibration piezoelectric ceramic chips are compacted between the amplitude transformation rods and the neutral plate. The vibrator is suitable for the conventional rotating ultrasonic motor.