2303results about "Mechanical vibrations separation" patented technology

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.

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.

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 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.

A piezoelectric actuator comprises a stack of a plurality of piezoelectric films, a piezoelectric element having electrodes disposed between the piezoelectric films and at both end surfaces, and a drive circuit. Each of the plurality of piezoelectric films has asymmetric polarization-voltage hysteresis characteristics with two different absolute values of coercive voltage. The drive circuit applies a unipolar voltage waveform that generates an electric field in the same direction as the direction of spontaneous polarization in at least one layer from among the plurality of piezoelectric films and generates an electric field in the direction opposite to the direction of spontaneous polarization in the other piezoelectric films. A minimum voltage value V1 having a minimum absolute value in the unipolar voltage waveform is set such that the ratio of the slope T0 at 0 [V] to the slope T1 at the minimum voltage value V1 [V] in a hysteresis curve indicating bipolar polarization-hysteresis characteristics in another piezoelectric film satisfies |T0 / T1| ≥ 1.5.

The invention discloses a preparation method of a silicon dioxide-epoxy resin composite material, the acoustic impedance of the composite material is controlled by adjusting the volume fraction of the silicon dioxide-epoxy resin composite material, an ultrasonic transducer prepared by utilizing the composite material and a preparation process thereof, and an imaging system designed by utilizing the ultrasonic transducer. By designing the matching layer and the backing layer with specific acoustic impedance, seamless fusion of ultrasonic imaging and photoacoustic imaging is realized, the transducer has ultrahigh sensitivity, broadband characteristic and high optical transparency, shows bimodal imaging capability of high contrast and high resolution, and solves the problem that a traditional transparent ultrasonic transducer is insufficient in acoustic performance.

The invention relates to a vehicle interior component (1) with a surface (2) designed as a textile (3) and with a vibration generator (4) for generating a vibration of the surface (2) for removing contaminants (5) present on the surface (2). A compact design can be achieved by the textile (3) having a dielectric elastomer (6) which deforms elastically depending on an applied electrical voltage, wherein the vibration generator (4) is electrically coupled to the elastomer (6) and is configured such that the vibration generator (4) applies an electrical voltage oscillating at a vibration frequency to the elastomer (6) of the textile (3) in order to generate a vibration of the surface (2).

A phononic circuit component including a membrane coupled to a substrate, the membrane including a region having an array of holes and a channel provided in the substrate beneath the region so that the region is released from the substrate, thereby allowing the region to propagate transverse acoustic waves, wherein the holes are spaced by a distance that is substantially smaller than a wavelength of the acoustic waves.

The present disclosure provides a cleaning robot comprising one or more motors and a controller configured to control the one or more motors to generate acoustic signals indicative of content. The controller is configured to control at least one of a frequency of the acoustic signals and a pulse width of acoustic pulses generated by the one or more motors. The controller may be configured to control the one or more motors to generate an ascending sequence of frequencies and to use a frequency of a pulse generated by the one or more motors to validate a pulse width of the pulse. The one or more motors are configured to transmit frequency tones that indicate bits of a first value within the content. The one or more motors comprise at least one of a pump motor and a drive motor, wherein the controller is configured to control electric power within a motor coil using pulse width modulation to generate the acoustic signals.

The invention belongs to the technical field of material conveying, and particularly relates to a magneto-rheological elastomer vibration conveying screen which comprises a rack and a screen bed, the screen bed is of a four-layer composite structure design, and the upper layer is a working face composed of a plurality of independent rigid beams; the second layer is an organ plate sealing lattice filled with a magnetorheological elastomer; the third layer is a sealing layer; the bottom layer is an electromagnet matrix layer. The control system collects material state data in real time through the sensor, dynamically adjusts working parameters of the electromagnet after analysis and processing, controls rigidity changes of the magnetorheological elastomer, and achieves self-adaptive conveying of materials. The equipment supports three working modes: in the traveling wave conveying mode, propelling waves are formed through phase control, so that the conveying efficiency is improved; the whole oscillation starting mode realizes uniform vibration, and the conveying stability is ensured; and material deviation is automatically corrected in a differential deviation correction mode, so that the operation reliability is ensured. The conveying efficiency and the material protection are optimally balanced, the material breakage rate is reduced, and the equipment adaptability and the intelligent level are improved.

A vibrating plate for compacting a floor has an upper mass; a lower mass movable relative to the upper mass; a vibration exciter for generating vibrations for compacting the floor; and a vibration decoupling device arranged between the upper mass and the lower mass. The the upper mass has components selected from the group consisting of a drive for driving the vibration exciter, an energy storage for the drive, a frequency converter, and electronic components. The lower mass has a floor contact plate for introducing the vibrations into the floor to be compacted. The vibration decoupling device has a plurality of attachment points to which the upper mass is attached. The upper mass has a one-piece shell body that at least partially encloses at least some of the components of the upper mass and that is attached to the vibration decoupling device at the attachment points.