34 results about "Auditory radiation" patented technology

A device and method for assembling objects by generating an axial acoustic radiation force in order to position the objects on pressure nodes and / or antinodes and generating a transverse acoustic radiation force in order to move the thus positioned objects on a porous membrane contact structure.

The invention relates to a measurement and inversion reconstruction method for a helicopter rotor sound radiation ball in an acoustic wind tunnel, and relates to the technical field of helicopter aeroacoustics wind tunnel test technology and sound target characteristics, and the method comprises the steps: measuring the noise radiated by a helicopter rotor in the acoustic wind tunnel through a hemispherical far-field noise measurement device; noise signals of the rotor in different directions are obtained, and a rotor sound radiation ball model is constructed; based on a sound propagation theory in a flow field, constructing a propagation model from the surface of the sound radiation ball model to the position of a microphone, and based on the influence of background noise, establishing a sound propagation equation from the surface of the sound radiation ball model to the microphone in the hemispherical far-field noise measurement device; and converting the sound propagation equation into solving a least square problem, solving to obtain sound source distribution on the surface of the sound radiation ball model, and reconstructing noise at any position of the far field of the helicopter rotor. The method can be suitable for reconstructing the helicopter rotor sound radiation ball in complex environments such as acoustic wind tunnels and high background noise, and practical research and application are carried out.

Focused acoustic radiation, referred to as tonebursts, are applied to a volume of liquid to generate a set of droplets. In one embodiment, a first toneburst is applied to temporarily raise a mound or protuberance on a free surface of the fluid. After the mound has reached a certain state, at least two additional toneburst can be applied to the protuberance to sequentially eject multiple bursts of multiple droplets. In one embodiment, the state of the mound can be maintained by a sustained acoustic signal, during which time multiple additional tonebursts can be applied to sequentially eject multiple bursts of multiple droplets from the mound.

The embodiment of the present application relates to a kind of dual-frequency high-power liquid processing ultrasonic transducer, comprising: one end of amplitude transformer is connected with sandwich transducer to form longitudinal displacement output structure;Metallic pipe is provided with mounting hole in side surface, mounting hole is connected with amplitude transformer by connecting piece arranged in the conical end of amplitude transformer, both ends of metallic pipe are provided with concave flexure shell;The half-wave mode and full-wave mode of longitudinal displacement output structure make the radial vibration and axial vibration of metallic pipe, form the complex frequency operating mode of ultrasonic transducer.The embodiment of the present application excites the radial vibration and longitudinal vibration of metallic pipe by the half-wave and full-wave mode of longitudinal displacement output structure respectively, realizes the dual-frequency operating mode of ultrasonic transducer;Concave flexure shell amplifies the radial vibration displacement of metallic pipe in phase, increases the acoustic radiation area of metallic pipe axial vibration, improves the acoustic radiation power of ultrasonic transducer and the uniformity of transducer radiation sound field.

The invention relates to an acoustic radiation detector (4) for high-energy radiation, comprising a solid absorption layer (12) and a detector assembly (13) which is acoustically coupled to the absorption layer (12), wherein - the absorption layer (12) is designed, with respect to the material and thickness thereof, such that at least 50% of the particle radiation or electromagnetic radiation of the specified radiation energy is absorbed, and - the detector assembly (13) comprises a plurality of acoustic sensors (14) which are arranged in a matrix over a surface and are designed to measure sound waves emerging from the absorption layer (12). The invention also relates to an imaging medical system.

A portable eyewear electronic device that includes a speaker module and methods of assembly of the device are presented. The electronic eyewear device includes a speaker module that emits acoustic radiation that is channeled through a carrier contained within a temple to one or more acoustic ports near a user's ear.

A method of generating audio content is disclosed. The method includes generating first audio content to be output by a speaker of a display device. The first audio content is generated based on device data of the display device that indicates that a main axis of the speaker is in a first direction. The method includes (i) determining a presence of an auxiliary speaker configured to output audio associated with the display device, and (ii) determining that the main axis of the speaker has been modified to be in a second direction different than the first direction. The method also includes generating second audio content to be output by the speaker. The second audio content may be generated differently than the first audio content due to the main axis of the speaker being modified from the first direction to the second direction.

The invention relates to the technical field of graphene new material preparation and precise acoustic control, in particular to a graphene film material production device and process, and the device comprises a beam forming control module which drives a sound field emission array to emit sound waves to a wet film; the disturbance monitoring module is used for collecting fluid fluctuation in real time and generating reverse suppression pressure through a reverse sound field reconstruction unit so as to update signals; the potential energy field construction unit is used for constructing layered standing wave nodes, forcing a nanosheet layer to be horizontally oriented by using acoustic radiation torque, and circularly operating until Mallangori convection is inhibited and a membrane material is cured; excessive drying or insufficient drying is avoided, and the mechanical strength and the production yield of the membrane material are further guaranteed.

This invention proposes a high-efficiency electro-electric transducer with circumferential radiation and multiple vibrators, belonging to the field of underwater acoustic transducers. It solves the problems of large space occupation and complex installation associated with existing technologies that use multiple electro-electric transducers. It includes a housing, multiple driving vibrators, and a pressure-balancing airbag. The housing includes a central ring and multiple vibrator cover plates. The central ring has multiple receiving holes spaced apart along its circumference. Each vibrator cover plate is located at one end of a receiving hole. The multiple driving vibrators are electrically connected and loaded with a current of the same amplitude and phase, generating radial acoustic radiation. The pressure-balancing airbag is located on the inner wall of the central hole of the central ring. The gas inside the pressure-balancing airbag is connected to the gas inside each of the multiple driving vibrators. The vibrator cover plates and the pressure-balancing airbag are located at opposite ends of the driving vibrators. It improves radiated acoustic power and electro-acoustic efficiency, is easy to install, and does not occupy the internal space of the underwater unmanned vehicle.

The application discloses a device and a method for measuring the local density of states of a sound field, and the measuring device comprises a sound source, a square waveguide, a MEMS silicon microphone and an acoustic vector sensor; one end of the square waveguide is connected with the sound source, and the other end is embedded with the MEMS silicon microphone and the acoustic vector sensor which are attached to the inner wall of the square waveguide. By measuring the particle velocity of the end surface of the waveguide, the volume flow rate of the waveguide into the measured structure can be obtained, and the local density of states of the measured structure can be calculated by combining the sound pressure obtained by the MEMS silicon microphone. The application overcomes the difficulty that the volume flow rate of the sound source in a narrow area cannot be accurately measured by using the vector detection technology, realizes the experimental measurement of the local density of states of the sound field, can be applied to the characterization of acoustic structural materials, and provides guidance for the design of acoustic radiation structures.

The invention relates to the technical field of composite board structures, in particular to a ship cabin sound insulation and vibration reduction partition board with acoustic black holes and a design method of the ship cabin sound insulation and vibration reduction partition board. The partition plate comprises an acoustic black hole thin plate layer, a damping material layer and a honeycomb plate layer. A plurality of groups of acoustic black hole structures are arranged on the acoustic black hole thin plate layer in an array form, and the thickness of an acoustic black hole region meets a power law; the damping material layer is used for forming an energy buffering interface, and the two faces of the damping material layer are connected with the acoustic black hole thin plate layer and the honeycomb plate layer correspondingly. The cellular board layer is used for completing acoustic radiation impedance matching suppression. Through the gradient impedance design of each functional layer, a complete sound vibration control chain of vibration capture-energy dissipation-sound wave impedance matching is constructed, the sound insulation index can be improved without increasing the system mass, and the method is particularly suitable for ship cabins and other application scenes which are sensitive to weight and need broadband noise reduction.

This invention discloses a sound field modulation device and method based on a multifunctional acoustic metasurface. The acoustic metasurface is installed at the acoustic radiation end of a partitioned piezoelectric transducer for phase modulation of the sound waves excited by the transducer. The partitioned piezoelectric transducer includes partitioned piezoelectric ceramics and a control circuit. The partitioned piezoelectric ceramics are circular and radially divided into an inner circular electrode partition and an outer annular electrode partition. Each electrode partition is electrically connected to the control circuit to independently excite different electrode partitions to generate sound waves. The acoustic metasurface is radially divided into phase modulation regions corresponding one-to-one with the electrode partitions of the partitioned piezoelectric ceramics. Each phase modulation region is equipped with a different phase coding pattern to form sound fields with different functions under different electrode partition excitation states. This invention achieves a multifunctional sound field by switching the partitioned electrodes, which can significantly improve the efficiency of detection and treatment in non-destructive testing and medical ultrasound, and broaden the utilization rate of planar ultrasound transducers.

A diffuser capable of evenly and widely diffusing sound emitted from a speaker, thereby making it possible to obtain excellent acoustic radiation characteristics. The diffuser includes a base portion formed into a plate shape and including a through hole having approximately the same shape and size as a diaphragm of the speaker, a center reflection portion formed into a predetermined size corresponding to the through hole and supported by the base portion, and an edge reflection portion that is formed into an arcuate shape protruding at least either forward or rearward of the base portion from a peripheral edge of the through hole of the base portion and having a recessed inner surface, for further reflecting sound reflected from the center reflection portion.

A pass box configured to accommodate and decontaminate an article by concentrating a mist of decontamination agent on an article's surface and to reduce a duration of aeration operations. The box includes a decontamination chamber, an aeration chamber in which residue of the decontamination agent is removed from the article's surface, a decontamination agent supply device, a decontamination agent control device, a moving device configured to reposition the article, and an air supply and exhaust device. The decontamination agent supply device converts a chemical into the mist and supplies it into the decontamination chamber. The decontamination agent control device includes vibration boards that are adjacent to internal wall surfaces of the decontamination chamber and that are ultrasonically vibrated to generate sound flows in the vertical direction thereby pressing the mist with acoustic radiation to concentrate the mist on the external surfaces of the article.

A speaker unit with a speaker frame and two membranes arranged in the speaker frame. A first membrane radiates in a major acoustic radiation direction substantially perpendicular to a major plane of the speaker unit. A second membrane has a secondary acoustic radiation direction different from the major acoustic radiation direction. Two drive units are positioned within the speaker frame, attached to the two membranes, and positioned coaxial to each other at the same height in the speaker frame. An acoustic duct provides for a closed acoustic channel from the second membrane in the secondary acoustic radiation direction to a secondary surface of the speaker unit in a same plane as the major plane of the speaker unit.

The invention discloses a structural dry-wet response conversion and underwater noise calculation method based on an acoustic impedance matrix, and the method comprises the steps: obtaining the vibration mode of an overall structure, obtaining a mode shape matrix, carrying out the forced response test of the overall structure, and obtaining the node vibration response of the overall structure. A modal participation coefficient is calculated through inversion or a regularization method, a modal with the modal participation coefficient being 0 is eliminated, response expression is updated, an immersed surface acoustic radiation impedance matrix is calculated, a modal participation coefficient vector after immersion is calculated, underwater vibration response of the structure is calculated, and underwater acoustic radiation is calculated according to immersed surface vibration response distribution and an acoustic radiation acoustic resistance matrix. According to the vibration response of the structure in the light medium and the acoustic impedance matrix of the underwater immersion surface of the structure, the prediction of the underwater vibration response and sound field distribution of the structure is realized; the method can overcome the problems of high difficulty in underwater testing, low fluid-solid coupling calculation efficiency and the like, and is a new method for conveniently and efficiently obtaining the underwater vibration sound response of the structure.

This invention discloses a method for calculating noise through direct coupling between a worm gear structure and its acoustic field, belonging to the field of noise prediction technology for mechanical transmission systems. The method includes: decomposing the time-domain torque into DC and AC components; establishing a structure-acoustic field coupled finite element model with a matching layer (PML); solving for steady-state prestress using the DC component; treating the AC component as a disturbance under prestress, and directly solving the coupled dynamic equations through harmonic response to obtain the full-field sound pressure response in one step; finally, extracting the sound pressure level distribution to achieve noise prediction. This invention overcomes the shortcomings of the traditional "two-step method" (cumbersome process, neglecting the acoustic radiation of the worm gear itself) by linearizing the prestress and using a one-step direct coupling solution, achieving fast and high-fidelity noise prediction under steady-state conditions, significantly improving computational efficiency and accuracy.

The invention discloses an axis stringing bending disc transducer for a linear array, and belongs to the technical field of underwater acoustic transducers. The transducer comprises a piezoelectric ceramic annular piece, a sound radiation annular plate, a positioning core body and an O-shaped ring, the whole transducer is vertically symmetrical, and a through hole is formed in the center of the transducer and used for allowing a force bearing rope to penetrate through; the positioning core body is fixed with the bearing rope through the positioning bolt, so that the transducer is positioned in the online array; a sealing groove is formed in the center of the sound radiation annular plate, and an O-shaped ring is arranged in the sealing groove to form radial dynamic sealing. According to the linear array sonar system, the number of the bearing ropes at the section positions of the transducers in the linear array is reduced from original two to one through the axial center rope penetrating design, the section space utilization rate is remarkably improved, the radial size and weight of the linear array are reduced, close arrangement of multiple transducers is supported at the same time to optimize the resonant frequency, and the linear array sonar system is suitable for towed linear array sonar systems.

A system for sequential exposure of particles to different fluid streams includes an acoustic actuator device for acoustically driving one or more substrates and a microchannel device of the one or more substrates that receive particles in a first flowing fluid, moves the particles to a second flowing fluid, then moves the particles out of the second flowing fluid using acoustic radiation generated by the acoustic actuator device. The system can control residence times in the streams. According to one use, the first flowing fluid is a cell buffer and the second flowing media is an electroporation buffer. An electroporation system is placed in or downstream of the acoustic actuator device. However, in other uses, the second flowing media might be a wash buffer.

An acoustic processing system includes: a signal processing unit that determines an input voltage on the basis of a target parameter including a volume flow rate of an acoustic port by using a nonlinear model that simulates a relationship in which acoustic impedance of the acoustic port for acoustic radiation based on Helmholtz resonance depends on the volume flow rate of the acoustic port; and a voltage supply unit that supplies an input voltage to the speaker device.

Focused acoustic radiation, referred to as tonebursts, are applied to a volume of liquid to generate a set of droplets. In one embodiment, a first toneburst is applied to temporarily raise a mound or protuberance on a free surface of the fluid. After the mound has reached a certain state, at least two additional toneburst can be applied to the protuberance to sequentially eject multiple bursts of multiple droplets. In one embodiment, the state of the mound can be maintained by a sustained acoustic signal, during which time multiple additional tonebursts can be applied to sequentially eject multiple bursts of multiple droplets from the mound.

The invention belongs to the technical field of underwater acoustic transducers, and relates to a multi-slit type circular ring underwater acoustic transducer, which comprises a plurality of vibration units which are axially symmetric and periodically distributed, and each vibration unit has the same structure and comprises a slit metal shell, a longitudinal driving source and a switching mass block; wherein the slotted metal shell is arc-shaped and is provided with one or more slots; the switching mass block is connected with the slotted metal shell and the longitudinal driving source and provides prestress for the longitudinal driving source. And the slotted metal shells of the plurality of vibration units jointly form a ring-shaped vibration radiation surface. Broadband emission is formed by coupling the bending vibration mode of the slotted radiant panel and the longitudinal vibration mode of the longitudinal driving rod, the effective bending radiation area is increased, the sound radiation efficiency is improved, and the transducer of the structure has the advantages of being small in size, low in frequency, capable of achieving broadband emission and the like and can be applied to the fields of low-frequency active sonar, deep-sea remote communication, marine environment monitoring and the like.

The application provides a device and method for measuring the ultrahigh frequency ultrasonic acoustic radiation force on an object, wherein the device comprises an elastic force receiving component, an ultrahigh frequency ultrasonic transducer and a displacement measuring device, the elastic force receiving component comprises a glass capillary and an object, the lower end of the glass capillary is a fixed end, the upper end of the glass capillary is a free end, and the object is fixed to the upper end of the glass capillary; the ultrahigh frequency ultrasonic transducer is located on the side of the object, the ultrahigh frequency ultrasonic transducer is used to generate ultrahigh frequency ultrasonic waves according to an excitation signal, and the object moves axially and laterally under the action of axial and lateral ultrasonic acoustic radiation forces; and the displacement measuring device is arranged above the object and is used to measure the axial and lateral displacements of the object under the action of the axial and lateral ultrasonic acoustic radiation forces. The device can be used to simultaneously measure the axial and lateral ultrasonic acoustic radiation forces on the object.

Provided in the present invention is a headrest having an independent sound zone, the headrest comprising a headrest body and an acoustic radiation system, wherein the acoustic radiation system comprises an acoustic transducer and an acoustic dipole, which are fixed to the headrest body and are arranged independently of each other, the acoustic transducer is used for radiating sound to a designated area, the acoustic dipole comprises a first housing fixed to the headrest body, and a first sound production unit and a second sound production unit, which are fixed in the first housing and are spaced apart opposite each other, the first sound production unit and the second sound production unit each radiate sound in at least two directions, and there is a phase difference between the sound radiated by the first sound production unit and the sound radiated by the second sound production unit. In the present invention, the acoustic transducer and the acoustic dipole cooperate with each other, such that vector superposition can be performed on the sound in a target area other than a designated area, and a sound pressure level difference between the designated area and the target area is maximized, and thus the sound leakage of a headrest speaker is reduced, thereby achieving a relatively good sound zoning or sound isolation effect and improving the user experience.

The invention discloses a high-power circular ring transducer suitable for large-range deepening use, and belongs to the technical field of transducers. The transducer comprises an acoustic radiation unit and a pressure adaptive unit. The sound radiation unit comprises a piezoelectric ceramic splicing ring and a sealed cavity A, and is used for realizing electro-acoustic conversion and radiating sound waves; the pressure self-adaption unit comprises a volume-variable sealing cavity B and a pressure transmission part, external hydrostatic pressure is transmitted to the gas cavity through a sealing piston and a through hole structure, and the volume of the gas cavity is automatically adjusted along with the water depth. When the energy transducer works in shallow water, the gas chamber keeps a large volume, so that the energy transducer presents an air backing type characteristic and has high radiation efficiency and a high altitude threshold; when the energy transducer works in deep water, the volume of the gas chamber is reduced, so that the energy transducer has an overflow characteristic and has wide frequency band and deep water resistance. The low-frequency high-power active-passive towed linear array sonar transducer has the advantages of two transducers, realizes large-range self-adaptive deepening work from shallow sea to deep sea, and is suitable for a low-frequency high-power active-passive towed linear array sonar system.

The present invention relates to the technical field of centrifugal pump fault diagnosis and classification, and specifically to a method for fault diagnosis of centrifugal pump acoustic radiation signals, comprising: obtaining a first acoustic radiation signal under different working conditions; filtering the first acoustic radiation signal with a non-recursive filter to obtain a second acoustic radiation signal; converting the one-dimensional time series of the second acoustic radiation signal into a two-dimensional GASF image as a sample set using a Gram angle field; improving a densely connected convolutional network structure and optimizing the hyperparameter combination of the network structure using a Bayesian optimization algorithm to obtain an acoustic radiation signal fault diagnosis model; and using the acoustic radiation signal fault diagnosis model to perform centrifugal pump fault diagnosis. The present invention converts a one-dimensional time series signal into a two-dimensional image, which can retain the time information of the fault feature and help improve the fault recognition rate. At the same time, the Bayesian optimization algorithm obtains the hyperparameters of the improved densely connected convolutional network, so that the improved densely connected convolutional network has a faster convergence speed and a higher fault recognition accuracy.

The invention discloses a helicopter three-dimensional sound field prediction method and device, equipment, a medium and a product, and relates to the field of helicopter aeroacoustics, and the method comprises the steps: obtaining observation point information, and extracting flight parameters on a flight path of a helicopter; carrying out selection and attitude alignment on the flight parameters on the flight path of the helicopter and radiation balls in a helicopter sound radiation ball library to obtain the radiation balls corresponding to the flight path; the helicopter sound radiation ball library is constructed by using load information of a helicopter; taking a radiation ball corresponding to the flight path as a sound source for radiation, and calculating sound pressure levels of observation points under different propagation paths according to the observation point information based on a Gaussian beam theory of fluctuation acoustics; determining a total sound pressure level based on atmospheric sound absorption, geometric attenuation and reflection / transmission attenuation according to the sound pressure levels of the observation points in different propagation paths; and generating a helicopter three-dimensional sound field cloud picture by using the total sound pressure level. According to the method, the three-dimensional sound field of the helicopter under the complex terrain can be quickly predicted.

The invention discloses a sound and vibration characteristic calculation method and device for a combined shell model comprising a truss buoyant raft and a medium, and relates to the technical field of ship vibration and noise reduction. Based on a numerical calculation method, input mechanical impedance and an underwater sound radiation transfer function corresponding to the installation position of the combined shell in the vibration isolation system are determined; for the vibration isolation system, an overall dynamic stiffness matrix of the vibration isolation system is created based on the structural characteristics of the truss type floating raft; determining the target vibration transmission response of the exciting force generated by the equipment to the combined shell through the vibration isolation system; and inputting the target vibration transfer response into the underwater sound radiation transfer function to obtain target underwater sound radiation. The method is used for solving the problem that in the prior art, the calculation precision is poor when the vibration sound radiation of the combined shell model comprising an internal vibration isolation system is calculated, and the sound vibration characteristics of the combined shell model comprising the truss buoyant raft are accurately calculated.

The application discloses a 4D ultrasonic imaging system and method based on a partition electrode and compressed sensing. A backing, a piezoelectric ceramic and a matching layer are sequentially arranged in the shell, a positive electrode of the piezoelectric ceramic serves as an acoustic radiation surface and faces a target area through the matching layer, a negative electrode of the piezoelectric ceramic is provided with the backing for absorbing reflected waves, the piezoelectric ceramic is electrically connected with a control circuit through a cable penetrating out of the shell, a spatial phase mask is arranged outside the shell and contacts a side of the matching layer away from the piezoelectric ceramic, and is used for modulating a spatial phase distribution of a transmitted acoustic wave; the acoustic radiation surface of the piezoelectric ceramic is divided into a plurality of electrode areas, each electrode area is electrically connected with the control circuit respectively, the control circuit is used for controlling independent excitation and reception of each electrode area, and the negative electrode of the piezoelectric ceramic is grounded. Compared with a traditional phased array device, the application greatly reduces the complexity and operation cost of the device, and effectively solves the problem that the prior art is difficult to rotate or move the mask to increase additional signal measurement values.