2799results about "Mechanical vibrations separation" patented technology

A sonotrode includes a stem extending along a longitudinal axis and a cap configured to carry out an ablative process on tissue using mechanical oscillation. The cap has at least one portion that protrudes further in a radial direction than the stem, and the at least one portion has at least one sharp rim. A surface of the cap, which is arranged between a distal end of the stem and the sharp rim of the portion, is a concave surface and / or runs at an opening angle with respect to the stem that is equal or smaller than 90 degrees. A center of mass of the cap is on the longitudinal axis.

The invention discloses a planar phased array ultrasonic transducer, and relates to the technical field of transducers, the planar phased array ultrasonic transducer comprises a 1-3 type piezoelectric composite board, a common positive electrode panel and a flexible circuit board, the 1-3 type piezoelectric composite board comprises a polymer frame and a plurality of PZT piezoelectric ceramic columns, all the PZT piezoelectric ceramic columns are embedded in the polymer frame in an array, and the PZT piezoelectric ceramic columns are connected with the flexible circuit board. One end of each PZT piezoelectric ceramic column is a positive electrode end, the other end of each PZT piezoelectric ceramic column is a negative electrode end, the common positive electrode panel is connected with the positive electrode ends of the PZT piezoelectric ceramic columns, the flexible circuit board is provided with a bonding pad area and at least one pin area, the bonding pad area is fixedly provided with a plurality of bonding pads, the pin area is fixedly provided with a plurality of pins, and the flexible circuit board is provided with a plurality of conductive terminals. All the pins, all the bonding pads and all the negative electrode ends of the PZT piezoelectric ceramic columns are in one-to-one correspondence, the bonding pads are electrically connected with the pins, and the bonding pads are connected with the negative electrode ends of the PZT piezoelectric ceramic columns; according to the invention, the PZT is applied to the planar phased array ultrasonic transducer.

A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

An acoustic matching structure is used to increase the power radiated from a transducing element with a higher impedance into a surrounding acoustic medium with a lower acoustic impedance. The acoustic matching structure consists of a thin, substantially planar cavity bounded by a two end walls and a side wall. The end walls of the cavity are formed by a blocking plate wall and a transducing element wall separated by a short distance (less than one quarter of the wavelength of acoustic waves in the surrounding medium at the operating frequency). The end walls and side wall bound a cavity with diameter approximately equal to half of the wavelength of acoustic waves in the surrounding medium. In operation, a transducing element generates acoustic oscillations in the fluid in the cavity. The transducing element may be an actuator which generates motion of an end wall in a direction perpendicular to the plane of the cavity to excite acoustic oscillations in the fluid in the cavity, and the cavity geometry and resonant amplification increase the amplitude of the resulting pressure oscillation. The cavity side wall or end walls contain at least one aperture positioned away from the center of the cavity to allow pressure waves to propagate into the surrounding acoustic medium.

The embodiment of the invention provides an ultrasonic transducer, a preparation method of the ultrasonic transducer, an ultrasonic fingerprint module and electronic equipment. The ultrasonic transducer comprises a substrate, a bottom electrode, a piezoelectric layer, a top electrode and an excitation electrode, the bottom electrode is located on the upper surface of the substrate, the piezoelectric layer is located above the substrate and covers the bottom electrode, and at least part of the top electrode is located above the piezoelectric layer; the excitation electrode is located on the upper surface of the substrate, a distance exists between the excitation electrode and the bottom electrode, the piezoelectric layer is provided with an opening part, and the top electrode is electrically connected with the excitation electrode through the opening part; the excitation electrode is used for receiving an excitation signal and applying the excitation signal to the top electrode, so that an electric field is formed between the top electrode and the bottom electrode to excite the piezoelectric layer to emit an ultrasonic signal, and the bottom electrode is used for receiving an ultrasonic detection signal generated between the top electrode and the bottom electrode when the returned ultrasonic signal acts on the piezoelectric layer. The performance of the ultrasonic transducer in the scheme is good.

The invention discloses a vibration excitation device, a vibration excitation system and a use method of the vibration excitation device, and relates to the field of engineering structure detection, and the vibration excitation device comprises a supporting frame which is used for being placed on a vibration-excited object; the supporting hinge is arranged on the supporting frame; one side of the lever is rotationally connected with the supporting hinge; the mass block is connected with the other side of the lever and is arranged on the support frame; the actuator is arranged on the supporting frame, and the output end of the actuator is connected with the lever; and the elastic piece is arranged on one side, hinged with the support, of the lever and is connected with the support frame and the lever. According to the vibration excitation device, the elastic force provided by the elastic piece fixedly installed on the supporting hinge side during resonance counteracts the inertia force, the actuator only needs to overcome the damping force, the reverse elastic force provided by the elastic piece can reduce friction damping, and the actuator power of the vibration excitation device is further reduced.

The present invention provides an atomizing device and control unit that can suppress dry-firing. [Solution] The atomizing unit 10 includes a vibrating member 13, which atomizes the liquid by vibrating the vibrating member 13. If the vibrating member 13 continues to vibrate when there is no liquid on its surface, it will result in a dry-firing state. The control unit 30 detects electrical information related to the operation of the atomizing unit 10. Furthermore, if the detected electrical information falls outside a predetermined threshold band, the control unit 30 performs avoidance control to avoid the dry-firing state. In this way, the control unit 30 can easily avoid the dry-firing state by using the electrical information.

A centrifugal separator arrangement includes: an energy converter positioned in proximity to a rotor of the centrifugal separator and configured to collect and convert the non-electrical energy generated by the rotor of the centrifugal separator into electrical energy; and a sensor configured to obtain a parameter associated with the operation of the centrifugal separator, wherein the sensor includes a processor configured to produce corresponding data, and wherein the sensor is in electrical connection with the energy converter to be powered by the electrical energy collected and converted by the energy converter. A method and a system for energy harvesting in the centrifugal separator arrangement is also provided.

To prevent discoloration of a transparent piezoelectric film made of a fluororesin in a transparent piezoelectric laminated film including the transparent piezoelectric film. A transparent piezoelectric laminated film including, by sequentially stacking, a transparent piezoelectric film made of a fluororesin, a transparent coating layer having a thickness of 0.20 μm or more, and a transparent adhesive layer.

The various implementations described herein include adhesive compositions for high-voltage focused ultrasound applications. In one aspect, an ultrasound transducer comprises a plurality of tiles. Each tile includes a first electrically conductive layer, a second electrically conductive layer, a plurality of transducer elements disposed between the first electrically conductive layer and the second electrically conductive layer, and a composite structural adhesive (a) disposed between the first electrically conductive layer and the second electrically conductive layer and (b) disposed between respective adjacent transducer elements of the plurality of transducer elements. The composite structural adhesive includes an epoxy resin, fumed silica, and a powder selected from the group consisting of: (i) micronized mica, (ii) bioactive glass powder, and (iii) micronized mica and bioactive glass powder.

Disclosed is a multi-modal and multi-degree-of-freedom piezoelectric active vibration isolation platform and a working method therefor. The piezoelectric active vibration isolation platform includes an upper platform, a lower platform, a control module, and four vibration isolation modules, where the vibration isolation module includes a passive vibration isolation unit and an active vibration isolation unit; the passive vibration isolation unit includes an upper connector, a lower connector, a cross Hooke hinge, and a first acceleration sensor; the active vibration isolation unit includes a fixed beam, a pre-tightening bolt, a second acceleration sensor, and a driving component; the platform can provide active vibration isolation for the longitudinal (axial) vibration and the bending vibration in any radial direction of a vibration isolation object, and has the advantages of fast response, resistance to electromagnetic interference, and light weight.

The utility model belongs to the field of curved block processing equipment, and particularly provides a parameter-controllable curved block bionic treading and rubbing device which comprises a power device used for driving a lifting assembly to lift up and down, the lifting assembly comprises a lifting platform, and the lifting platform is connected with a treading and rubbing support through a connecting rib plate. A plurality of treading and kneading lifting guide sleeves for guiding the treading and kneading connecting device are arranged on the treading and kneading support, a treading and kneading assembly is arranged on the lifting assembly, the treading and kneading assembly comprises an excitation power device for driving an eccentric shaft assembly, the eccentric shaft assembly comprises a power shaft, a plurality of eccentric bearings are arranged on the power shaft, and the upper end of an output sleeve rod is connected with the eccentric bearings; the treading and kneading connecting rod device comprises a loading connecting rod hinged to the supporting hinged support, the upper end of the tolerance connecting rod is hinged to the loading connecting rod, the lower end of the tolerance connecting rod is hinged to the treading and kneading connecting device, and the lower end of the treading and kneading connecting device is connected with the treading and kneading mold. The device simulates manual treading of the flexing block with feet for multiple times, improves the production efficiency and reduces the labor intensity.

An acoustically driven ferromagnetic resonance (ADFMR) device has a piezoelectric element comprised of piezoelectric material, first and second electrodes arranged in a vertical stack with the piezoelectric element to activate the piezoelectric element to generate an acoustic wave, a radio frequency voltage source electrically connected to the first electrode, a magnet comprised of a magnetostrictive material to receive the acoustic wave, the magnet being in the vertical stack with the first and second electrodes and the piezoelectric element, wherein the acoustic wave resonates at a ferromagnetic resonance of the magnetostrictive material, and a readout circuit to detect a change in the acoustic wave by detecting g one of an output voltage amplitude, a change in impedance or a reflection of the acoustic wave in the magnet to measure an unknown magnetic field in which the ADFMR device resides and as experienced at the magnetostrictive element.

The invention relates to the technical field of semiconductors, in particular to an ultrasonic chip and an ultrasonic module. The ultrasonic chip comprises a circuit layer, a piezoelectric layer and an electrode layer; the circuit layer comprises a substrate, an on-chip circuit of an ultrasonic transmitting circuit is arranged in the substrate, a first bonding pad, a second bonding pad and a first electrode are arranged on the substrate, and the electrode layer comprises a second electrode; the first electrode, the second electrode and the piezoelectric layer are used for forming an ultrasonic transducer; the on-chip circuit is used for generating an electric signal and transmitting the electric signal to the first bonding pad, the first bonding pad is used for transmitting the electric signal to an off-chip circuit of the ultrasonic transmitting circuit, and the off-chip circuit is used for generating an excitation signal according to the electric signal and transmitting the excitation signal to the second bonding pad; the second bonding pad is used for transmitting an excitation signal to the second electrode so as to drive the ultrasonic transducer to emit ultrasonic waves, and the on-chip circuit is located in an area outside an ultrasonic area. According to the embodiment of the invention, the integration level of the ultrasonic chip can be improved.

Systems and methods for implementing operation-specific impedance matching for enhancing sensitivity of an ultrasound system are described. To enhance sensitivity while using a transducer element for transmission and reception, a transducer module's architecture provides operation-specific impedance matching. Operation-specific impedance matching means that different impedances are provided for mitigating mismatch loss during transmission and reception. The impedance provided for reception can be associated with separate signal path with a smaller amount of attenuation compared to the impedance provided for transmission. In this way, the architecture enhances sensitivity of the ultrasound system by reducing an amount of attenuation experienced during reception compared to other ultrasound systems that utilize a same impedance for impedance matching during transmission and reception. With enhanced sensitivity, the ultrasound system can utilize higher frequencies and / or broader bandwidths to provide high-resolution images at farther imaging depths while meeting power-intensity guidelines.

A workpiece clamp of the device drives a workpiece to rotate around the center line of the workpiece, a spinning wheel is installed on a tool rest in a free rotation mode, the tool rest is installed on a feed driving mechanism, and the feed driving mechanism is matched with rotation of the workpiece clamp so that the spinning wheel can be rolled to all positions of the side face of the workpiece. One end of the first amplitude-change pole is connected with the tool rest, the other end of the first amplitude-change pole is connected with the first transducer, an included angle is formed between the second amplitude-change pole and the extension direction of the first amplitude-change pole, one end of the second amplitude-change pole is connected with the tool rest, and the other end of the second amplitude-change pole is connected with the second transducer. Ultrasonic vibration is conducted in the direction perpendicular to and parallel to the center line of the workpiece; the method applies the device. By reasonably setting the ultrasonic phase and amplitude, the surface of the workpiece can be impacted in the vertical direction and the tangential direction of the surface of the workpiece, and the quality of the spinning workpiece is improved.

Acoustic sensor systems with different heights, as well as methods for configuring and operating such sensor systems are disclosed. In some embodiments, a sensor system described herein may include an acoustic transmitter element; and an acoustic receiver element; wherein the first portion of the piezoelectric material of the acoustic transmitter element comprises a first thickness, and the second portion of the piezoelectric material of the acoustic receiver element comprises a second thickness different from the first thickness; and wherein the isolation layer is structured to create a gap that physically separates the first portion of the second electrode layer from the second portion of the second electrode layer.

The application provides a multi-wire submerged arc welding method and device for straight-seam steel pipes, and belongs to the technical field of welding. The method comprises the following steps: adopting a multi-wire submerged arc welding process to perform double-sided submerged arc welding on a straight-seam steel pipe, and when welding an outer weld, an ultrasonic auxiliary device arranged at the back of a molten pool generates ultrasonic waves and inputs the ultrasonic waves into the molten pool through a horn, so that the formation of intergranular ferrite in the weld zone is inhibited, the content of intragranular acicular ferrite is increased, and the toughness and hydrogen brittleness resistance of the weld zone are improved. The device comprises a three-wire submerged arc welding device, an ultrasonic auxiliary device and a telescopic cantilever beam; the ultrasonic auxiliary device is installed at the front end of the telescopic cantilever beam and comprises three ultrasonic transducers arranged side by side; a horn is installed at the output end of the ultrasonic transducer; the ultrasonic transducer generates ultrasonic waves and inputs the ultrasonic waves into the molten pool through the horn. The application solves the problems that the existing ultrasonic auxiliary arc welding cannot control the content of acicular ferrite and the effect of reducing residual stress in the weld zone is not obvious.

An ultrasonic imaging system has a bias-switchable, ultrasonic transducer array and a bipolar voltage source. The array has a dielectric layer having a top surface and a bottom surface; top and bottom electrode strips in electrical contact with the top and bottom surface of the dielectric layer, the bottom electrode strips being oriented at a non-zero angle relative to the top electrode strips. There is an acoustic matching layer or multiplicity of matching layers on the front-side of the array and a leakage-current mitigation layer. The bipolar voltage source is connected to each of the top and bottom electrode strips to induce a polarization in the dielectric layer, the bipolar voltage source being capable of switching between a high voltage state and a low voltage state. A controller controls the bipolar voltage source, and pulsing to and receiving signals from the top and bottom electrode strips.

The embodiment of the invention provides an ultrasonic knife control method and device, medical equipment and a storage medium, an ultrasonic knife comprises a first piezoelectric vibration assembly and a second piezoelectric vibration assembly, the first piezoelectric vibration assembly is used for generating ultrasonic waves based on a resonance mode, the second piezoelectric vibration assembly is used for collecting the output frequency of the ultrasonic waves, and the output frequency of the ultrasonic waves is converted into the output frequency of the ultrasonic waves. The ultrasonic knife control method comprises the steps that when a frequency conversion control instruction is received, the jump frequency of the frequency conversion control instruction is determined; obtaining the output frequency; determining a target frequency in combination with the hopping frequency and the output frequency; and controlling the first piezoelectric vibration assembly based on the target frequency and the output frequency. The target frequency is determined through the hopping frequency based on the frequency conversion control instruction, frequency hopping control is conducted on the first piezoelectric vibration assembly, the characteristics of different vibration waves are output, and the using effect of the ultrasonic knife is improved.

A micro-vibration wave generating device includes: a power indicator circuit, a first transformer micro-vibration wave generating circuit, and a receptor. An input end of the power indicator circuit is connected to the power source; an input end of the first transformer micro-vibration wave generating circuit is connected with an output end of the power indicator circuit; the receptor is connected with an output end of the first transformer micro-vibration wave generating circuit. Micro-vibration waves generated by the transformer micro-vibration wave generating circuit can resonate with the water molecules in the food, and thereby the water molecules form soft and non-spiky crystals of water molecules when they are frozen, which greatly reduces the damage to the food cells. Accordingly, the quality of the food is intact without mixing odors. The present invention can also be used in cooking deep fried food with almost no oil smoke produced.

A clampless synthetic jet actuator includes a cavity layer having an internal cavity for reception of a fluid volume and an orifice providing a fluid communication between the cavity and an external atmosphere; and an oscillatory membrane having a piezoelectric material adapted to deflect the oscillatory membrane in response to an electrical signal. The cavity has an opening in at least one planar surface of the cavity layer, and the cavity layer and the oscillatory membrane are joined by a high strength, low shear modulus adhesive material with the oscillatory membrane positioned adjacent to the planar surface having the cavity opening and adapted as an enclosing surface to said cavity opening. The oscillatory membrane is adapted to compress and expand a volume within the cavity, based on a deflection generated by the piezoelectric material, for generating a fluid flow between the cavity and the external atmosphere through the orifice.

The present invention relates to a centrifugal separator arrangement, the arrangement comprising: an energy converter positioned in proximity to a rotor of the centrifugal separator arrangement and configured to collect and convert the non-electrical energy collected from the centrifugal separator into electrical energy; a sensor configured to obtain a parameter associated with the operation of the centrifugal separator, wherein the sensor comprises a processor configured to produce corresponding data; wherein the sensor is in electrical connection with the energy converter to be powered by the electrical energy produced by the energy converter. The present invention also relates to a method and a system for energy harvesting in the centrifugal separator arrangement.

This specification describes a transducer configured to convert electrical signals into vibrational movement. The transducer comprises an axially-magnetised reciprocating magnet, wherein the axially-magnetised reciprocating magnet comprises an aperture such that the reciprocating magnet has an inner boundary and an outer boundary.The transducer further comprises at least two pairs of concentrically positioned electromagnetic solenoids, the at least two pairs of concentrically positioned electromagnetic solenoids being configured to drive the reciprocating magnet to reciprocate in a volume above and below the reciprocating magnet. The first solenoid of each of the pairs of concentrically positioned electromagnetic solenoids is positioned to influence the reciprocating magnet at the inner boundary more than at the outer boundary, and a second solenoid of each of the pairs of concentrically positioned electromagnetic solenoids is positioned to influence the reciprocating magnet at the outer boundary more than at the inner boundary. The reciprocating magnet is suspended in the mid-point of its axial travel at a null position using either mechanical springs or magnetic springs.

A method for detecting interference between a transducer of acoustic signals and a sensor having a mechanical resonance frequency with a frequency band that includes transmitting an acoustic signal within a known range of frequencies, in a sequence during a predetermined time window, monitoring the output signal from the sensor within said time window, comparing the transmitted signal with the sensor output signal and detecting deviations in the sensor output signal corresponding to frequencies in the acoustic signal, and determining the acoustic frequencies interfering with the sensor signal. A system for detecting interference including a transducer, configured to emit a sequence of acoustic signals, and a sensor configured to produce an output signal, an analysis unit adapted to monitor said output signal with the acoustic signal.

A piezo actuator system includes a piezo actuator; and a driving circuit configured to apply a pulse width modulation (PWM) voltage waveform to the piezo actuator. An envelope of the PWM voltage waveform includes a first period in which a first voltage rising with a first slope is applied, a second period in which a second voltage rising with a second slope is applied, and a third period in which a third voltage rising with a third slope is applied. The third slope is greater than the second slope.

An ultrasonic transducer array of this invention includes a rigid support plate with a through-hole group including through-holes, a flexible resin film fixed to the support plate so as to cover the through-holes, and piezoelectric elements fixed to the flexible resin film so that middle portions overlap the corresponding through-holes and peripheral portions overlap the support plate, wherein the piezoelectric elements include transmission piezoelectric elements forming transmission transducers that generate ultrasonic waves in response to driving voltage signal having a predetermined driving frequency and one or plural reception piezoelectric elements forming one or plural reception transducers that generate reception voltage signals in response to ultrasonic waves, and wherein the transmission transducer is of a non-resonant type that generates ultrasonic wave without resonant vibration in response to the driving voltage signal and the reception transducer is of a resonant type that performs resonant vibration in response to ultrasonic wave having a frequency corresponding to the driving frequency.

A driver device for use with a mist generator device, the driver device comprising a battery, an H-bridge circuit configured to be connected to an ultrasonic transducer of the mist generator device, and a microchip connected to the H-bridge circuit to control the H-bridge circuit to generate an AC drive signal. An oscillator is provided which is configured to generate a main clock signal, a first phase clock signal, and a second phase clock signal, wherein the phases of the first phase clock signal and the second phase clock signal are centre aligned. There is further provided a pulse width modulation (PWM) signal generator subsystem, a digital processor subsystem, and a digital to analogue converter (DAC) subsystem.

A histotripsy therapy system configured for the treatment of tissue is provided, which may include any number of features. Provided herein are systems and methods that provide efficacious non-invasive and minimally invasive therapeutic, diagnostic and research procedures. In particular, provided herein are optimized systems and methods that provide targeted, efficacious histotripsy in a variety of different regions and under a variety of different conditions without causing undesired tissue damage to intervening / non-target tissues or structures.