44results about How to "Large vibration amplitude" patented technology

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.

An active bearing at least for vibration reduction is described, comprising

a) an interface (7) to be fitted to a load (8);

b) at least one support element (3) in an operative connection with the interface (7) and a support unit (6);

c) at least one linear actuator (5) supported indirectly or directly on the support unit (6);

d) a gear unit (4) for the path transmission of an actuating path change originating from the linear actuator (5), said gear unit being in an operative connection with the at least one linear reactor (5);

e) at least one decoupling unit (1), which serves for the decoupling of the static load transfer and for transmitting the dynamic load transfer; wherein the at least one linear actuator (5), the gear unit (4) and the at least one decoupling unit (1) are disposed serially.

The invention relates to a grinding machine grinding chatter fault on-line diagnosis method. The method is characterized by processing a grinding machine chatter signal through BEMD; decomposing a constructed complex-value vibration signal into a series of complex-value intrinsic mode functions IMFs; screening real IMF components, correlation between which and an original signal is large, according to a judging criteria based on correlation coefficient; and then, carrying out summation on index quantities of peak-to-peak values, real-time variance, kurtosis, skewness and instantaneous energy and the like of the real IMF components respectively, and carrying out normalization processing to form feature vectors. Feature vectors of a part of experiment sample data are utilized to carry out classification training on a least square support vector machine (LSSVM) to obtain an identification model; then, the rest feature vectors are utilized to verify accuracy of the model, and a detection result is obtained; and finally, the verified LSSVM model is applied to monitoring of a grinding machine so as to monitor and judge the working state of the grinding machine in real time, and adjust operation of the grinding machine in time.

The invention relates to a low-frequency large-displacement horizontal movement vibration bench. The vibration bench comprises a power and control device, a braking device, a transmission mechanism, a driven device and a support device. The power and control device comprises a motor, a frequency conversion box and a speed reducing box. The braking device comprises an electromagnetic clutch and a brake. The transmission mechanism comprises a synchronous belt, a transmission main shaft, an eccentric adjusting device and a bearing support hole. The upper end of the transmission main shaft is connected with the eccentric adjusting device. The eccentric adjusting device is used for adjusting the eccentric distance of the transmission mechanism. The driven device comprises a bench face and a bench face guide rail. The support device comprises a substrate, a substrate guide rail and a horizontal support adjusting piece. According to the invention, by selecting the eccentric adjusting device with the biggest adjusting distance of 100mm, a quite big vibration amplitude value is achieved; the vibration amplitude range is from 0 to +/-100mm; the biggest amplitude is far high than that of other vibration bench in the market; and through control on the rotation speed by the speed reducing box and the frequency conversion device, low-frequency vibration of the vibration bench is achieved.

The invention relates to a smart damping-varying semi-active vibration absorption rubber mat based on vibration generation, which is formed by bonding a vibration generation layer, a dielectric elastomer layer and a rubber layer. Vibration energy of different magnitudes are converted into different voltage values by the vibration generation layer so as to change damping of the dielectric elastomer layer, so that the object of changing the damping of the rubber mat at right time and proper amount according to different vibration frequencies and amplitudes is achieved. Problems that performance parameters of common damping materials such as rubber, silica gel and asphalt are fixed, and the controllable vibration frequency range is narrow are solved, and requirements for wide frequency range vibration control of a hydraulic system under the high speed and high pressure development trend are met.

The invention discloses a high-power precision piezoelectric ultrasonic driving platform and a driving method thereof so as to solve the technical problems of unsatisfactory overall output performance and the like caused by independently adopting a beam-structure elastomer ultrasonic motor or a plate-structure elastomer ultrasonic motor to act as a positioning platform of a driver. The high-power precision piezoelectric ultrasonic driving platform comprises a fixed outer frame, a first elastomer, a second elastomer, a rotating platform, a rolling body, a thrust ball bearing, a butterfly spring, a fastening connector and an internal hexagonal bolt, wherein the first elastomer is of a beam structure, and the second elastomer is of a plate structure. According to the invention, ultrasonic frequency internal excitation electric signals are applied to a piezoelectric element, the first elastomer and the second elastomer are excited to generate a micro-amplitude high-frequency vibration mode, and driving friction is generated at a contact surface of the second elastomer and the rotating platform by using superposition coupling of the vibration modes, thereby realizing rotational displacement motion output. The high-power precision piezoelectric ultrasonic driving platform has the technical advantages of high output power, good running stability, wide application range and the like, and has wide application prospects in the technical fields of precision driving and micro positioning.

The invention discloses a method and device for washing and hot mass transfer of pollutants in gas. The method comprises the following steps: (1), atomizing washing liquid; (2), mixing gas fluid containing pollutants with the atomized washing liquid so as to obtain mixed fluid; (3), after the mixed fluid is subjected to washing and hot mass transfer through a sound wave generator, carrying out gas-liquid separation, so as to obtain purified gas and washing liquid containing the pollutants. According to the method, after the pollutants with a certain energy and speed are mixed with the washing liquid, full collision, breaking, adsorption, coagulation and energy transfer are carried out in a pressure field generated by the sound wave generator, so that efficient washing and hot mass transfer of the pollutants are realized.

A disclosed novel minisize gas turbine comprises a gas compressor, a turbine and a combustion chamber; the combustion chamber is connected with an impeller and a main-shaft divided body; the impeller is connected with a main shaft via a center pull rod; and the combustion chamber is connected with the impeller and the main-shaft divided body via pipes. A 2-0-0 supporting manner is adopted in the overall structure. The gas compressor and the turbine both employ an overhung cantilever end which easily generates relatively large vibration amplitude during working. The axial-direction pre-tightening pulling force generated through cooperation of a locking nut and a turbine pull rod shaft is capable of directly improving the positive pressure of a combination surface of the end tooth, thereby improving the coulomb frictional force between contact surfaces, and further improving the radial rigidity of the shafting overhung cantilever end, so that the radial vibration amplitude of the shafting overhung cantilever end, and also asynchronous radial vibration is avoided between the gas compressor impeller and the turbine. The provided overall structure project has the advantages of simple structure, low processing cost, compact structure and high transmission efficiency.

The invention discloses a longitrorse complex excitation ultrasonic motor, a driving platform and a driving method thereof, so as to solve the technical problem that the overall output performance of the ultrasonic motor is unsatisfactory as a girder structure elastomer or a disk structure elastomer is singly adopted. The longitrorse complex excitation ultrasonic motor comprises a fixing base, a first elastomer, a second elastomer, a rotation body, a key, a thrust ball bearing, a disk spring, and an output shaft, wherein the first elastomer has a girder structure; the second girder structure has a plate structure; and a piezoelectric patch adopts d31 and d15 excitation modes. Excitation electric signals in an ultrasonic frequency band are applied to the piezoelectric patch, a driving travelling wave is generated to form driving friction, and motion output in a forward direction and in a backward direction is realized. The longitrorse complex excitation ultrasonic motor has the technical advantages of large output power, stable motor operation, wide application range and the like, and has wide application prospects in technical fields of precise driving and micro positioning.

The invention discloses a patch-type ultrasonic motor, and a drive platform and a drive method thereof and aims at solving the technical problem that the ultrasonic motor which individually adopts a beam structure or disk structure elastomer is not ideal in overall output performance and the like. The patch-type ultrasonic motor comprises a fixed base, a first elastomer, a second elastomer, a rotating body, keys, a thrust ball bearing, a belleville spring, a nut and an output shaft, wherein the first elastomer is in a beam structure; the second elastomer is in a slab structure; a d<31> excitation mode is adopted by a rectangular piezoelectric ceramic piece; a deformation direction of the rectangular piezoelectric ceramic piece and the axis of the first elastomer are arranged at a +/-alpha angle; an excitation signal of an ultrasonic band is applied to the piezoelectric ceramic piece; the first elastomer and the second elastomer are excited to generate longitudinal and flexural vibration modes respectively; drive friction force is generated by superposing and coupling of the vibration modes; and movement outputs of the patch-type ultrasonic motor are achieved. The patch-type ultrasonic motor has the technical advantages of high output power, stable motor operation, wide application range and the like, and has a wide application prospect in the technical fields of precision driving and micro positioning.

The invention relates to a frequency adjustable vibration damping device for a low-frequency line spectrum of vibratory equipment and a vibration damping method thereof. The frequency adjustable vibration damping device comprises a dynamic vibration absorption system formed by a cantilever rod and a particle damper. The frequency adjustable vibration damping device is simple in structure and convenient to use; and the dynamic vibration absorption system formed by a cantilever rod and the particle damper can accurately control the low-frequency vibration line spectrum of the vibratory equipment, has relatively strong applicability and is suitable for the vibration suppression of various equipment in different directions. The frequency adjustable vibration damping device has very good nonlinear low frequency damping performance and the characteristics that the larger the vibration amplitude is, the better the damping effect is. When the dynamic vibration absorption system resonates withthe equipment, the dynamic vibration absorption system has relatively large vibration amplitude, can fully utilize the dissipation mechanism of particle damping, effectively dissipates the low-frequency vibration energy, and reduces the low-frequency line spectrum vibration of the vibratory equipment.

The invention provides an omnidirectional wind energy collector which comprises a fixed base, a cylindrical elastic cantilever beam is arranged on the fixed base, the bottom end of the cylindrical elastic cantilever beam is fixed through the fixed base, the top end of the cylindrical elastic cantilever beam is connected with an oscillation device, and the oscillation device can be a hollow cylinder, a hollow square column or a column with an X-shaped cross section; and a piezoelectric ceramic circular tube fixedly sleeves the cylindrical elastic cantilever beam. The omnidirectional wind energy collector is simple in structure, convenient to assemble, small in size and convenient to integrate, and the application of the wind energy collector in the self-energy-supply field is facilitated; compared with a bluff body structure with a conventional section shape, the oscillation device structure with the X-shaped cross section can increase the vibration amplitude of the energy collector, improve the energy collection efficiency and improve the utilization rate of wind energy; the wind energy collector based on the piezoelectric ceramic circular tube and the cylindrical elastic cantilever beam can respond to wind in different directions in the natural environment, outputs high electric energy and has high environmental adaptability.

The invention discloses an inertial linear ultrasonic motor based on bending vibration of a rectangular plate, and belongs to the technical field of inertial linear ultrasonic motors. The motor comprises a stator, a bottom plate and a mover, wherein the stator comprises two rectangular flange-type vibrators and a drive rod; the two rectangular flange-type vibrators are symmetrical in structure; the drive rod is arranged on the symmetry axis of the stator; each flange-type vibrator comprises a front-end block, piezoelectric ceramic plates, a clamping part and a rear-end block, which are fixed through bolts; through holes which are articulated with the bottom plate through threads are formed in the clamping part; the piezoelectric ceramic plates are arranged at the wave crests of bending vibration; the two flange-type vibrators are connected with the drive rod through the front-end blocks; and the mover sleeves the drive rod. By the first-order bending vibration effect of a matrix vibrator and the vibration effect of the piezoelectric ceramic along the thickness direction, the motor structure is simplified; installation and adjustment are facilitated; the bending vibration is in a low-order mode, so that the vibration frequency is low; the included energy is high; increase of a vibration amplitude of the drive rod is facilitated; the utilization rate of vibration energy is improved; and a relatively good vibration effect is obtained.

The invention relates to the technical field of strengthened heat transfer, in particular to a device for controlling the dropwise condensing heat transfer performance of a superhydrophobic surface bymeans of a sound field. The device comprises a shell; a dropwise condensing heat exchanger is arranged in the shell, a steam inlet is formed in the upper end of the shell, a condensed water outlet isformed in the lower end of the shell, a cooling water inlet and a cooling water outlet are formed in one side of the shell, the cooling water inlet is located above the cooling water outlet, and a sound is arranged on the other side of the shell and fixedly connected with the side wall of the shell; and the device further comprises a control module, an adjusting unit and a heat transfer performance detection unit, the control unit is connected with the adjusting unit, the adjusting unit is connected with the sound to enable the sound to generate a vibration which has the corresponding frequency and amplitude with a signal generated by the control unit, the vibration is loaded to the dropwise condensing heat exchanger, the heat transfer performance detected by the heat transfer performance detection unit is transmitted to the control unit in a signal mode, and the control unit adjusts the vibration signal frequency and amplitude of the sound.

The invention provides a galloping power generation device. The galloping power generation device comprises a vibrator mechanism, an electromagnet sensing mechanism and a separating disc mechanism; the vibrator mechanism realizes galloping through fluid, the vibrator mechanism generates magnetic line cutting movement relative to the electromagnet sensing mechanism during galloping, and the electromagnet sensing mechanism generates electric currents; and the vibrator mechanism and the separating disc mechanism are arranged in the flowing direction of the fluid in sequence. According to the galloping power generation device, a rigid separating disc which is fixed in a relative-vibration is additionally arranged behind a cylinder to trigger galloping, substantial increasing of a vibration amplitude value of the cylinder under the flowing speed that the ocean can achieve is realized, and the hydrodynamic force energy which can be extracted is substantially increased to efficiently use thehydrodynamic force.

The invention relates to a large-amplitude ultrasonic vibration cutting device. The large-amplitude ultrasonic vibration cutting device comprises a piezoelectric transducer, a first-stage amplitude-change pole, a second-stage amplitude-change pole, an elastic amplitude-change pole, a tool bit and a high-frequency power supply, the piezoelectric transducer comprises a bolt and further comprises a rear cover plate, a piezoelectric ceramic piece, an electrode slice and the first-stage amplitude-change pole which are sequentially arranged on the bolt front back to front in a sleeving mode and mutually connected and compressed, the second-stage amplitude-change pole is fixed to the front end of the first-stage amplitude-change pole, the elastic amplitude-change pole is fixed to the front end ofthe second-stage amplitude-change pole, the tool bit is fixed to the front end of the elastic amplitude-change pole, the electrode slice is connected with the high-frequency power supply, the high-frequency power supply can provide an ultrasonic electric signal for the piezoelectric ceramic piece through the electrode slice to make the piezoelectric ceramic piece drive the whole piezoelectric transducer to axially vibrate, and the first-stage amplitude-change pole, the second-stage amplitude-change pole and the elastic amplitude-change pole amplify the vibration amplitude of the piezoelectrictransducer stage by stage. The output power and the output power ratio of the transducer can be effectively increased, in the case of the same power, a vibration amplitude value of a cutting tool canbe effectively increased, and the electricity-machine conversion efficiency is improved.

The invention discloses a mechanical rectification type piezoelectric cantilever beam vibration energy collector. The energy collector comprises a base, a fixed supporting end fixed on the base, a piezoelectric cantilever beam fixed on the fixed supporting end, a mass block attached to the tip end of the piezoelectric cantilever beam and an electrode support. An upper movable electrode and a lowermovable electrode are respectively arranged on the upper surface and the lower surface of the mass block, and are respectively connected with two leads of the piezoelectric cantilever beam; the electrode support is fixed on the base; an upper fixed electrode, a middle fixed electrode and a lower fixed electrode are arranged on the electrode support from top to bottom; the upper fixed electrode islocated above the upper movable electrode; the middle fixed electrode is located between the upper movable electrode and the lower movable electrode; the lower fixed electrode is located below the lower movable electrode; and the upper fixed electrode is connected with the lower fixed electrode. According to the invention, piezoelectric alternating current generated by vibration can be convertedinto direct current through a mechanical rectifier, and voltage drop of a traditional electronic rectifier is avoided.