62 results about "Auditory radiation" patented technology

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.

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.

An ultrasonic control apparatus and method for a liquid jet are provided. An ultrasonic generator is equipped with two sets of ultrasonic transducers arranged perpendicularly to each other, and the two sets of ultrasonic transducers emit ultrasonic waves of a specific frequency. Two sets of reflectors are arranged correspondingly in front of the ultrasonic waves emitted by the two sets of ultrasonic transducers, where a distance exists between the ultrasonic transducers and the corresponding reflectors, two stable standing wave sound fields are formed by adjusting the distance. A liquid jet device is equipped with a nozzle that emits a continuous jet, where the nozzle is located above an intersection of pressure nodes of the two standing wave sound fields, and the two standing wave sound fields act on the liquid jet to adjust jet morphology under the action of acoustic radiation pressures.

To freely set a circular arcuate acoustic radiation distribution or sound collection sensitivity distribution in an acoustic array system using a tangent line method.SOLUTION: The control device 20 includes a generation section 21A for generating an arbitrary circular arc by defining a center coordinate and radius of a circular arc as an arbitrary constant among parameters defining a delay time of a tangent line method when a circular arcuate acoustic radiation distribution or a circular arcuate sound collection sensitivity distribution is set by using the tangent line method with respect to an acoustic array where a plurality of acoustic apparatuses are arranged on a straight line.SELECTED DRAWING: Figure 3

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.

Loudspeaker enclosures that support improved acoustic radiation efficiency at low audible frequencies without compromising acoustic radiation efficiency at mid and high audible frequencies. Embodiments include enclosures having a primary chamber and a secondary chamber acoustically coupled to the primary chamber via a passive radiator. The geometrical characteristics of the secondary chamber and the corresponding air plenum are tailored for enhanced efficiency at low frequencies.

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.

Techniques described herein generally relate to generating an audio signal with a speaker. In some examples, a speaker device includes an acoustic medium; a time-varying acoustic coupler; and at least one ultrasound source configured to generate an audio modulated acoustic radiation signal. The ultrasound source is acoustically connected to the acoustic medium through the time-varying acoustic coupler and the time-varying acoustic coupler is configured to generate an audio signal from the audio modulated acoustic radiation signal.

The present invention relates to an apparatus and a method for assembling objects (11, 12) by generating an axial acoustic radiation force to position the objects (11, 12) on pressure nodes (N1 to N4) and / or pressure antinodes, and further generating a lateral acoustic radiation force to move the objects (11, 12) positioned in this way onto a contact structure (4) of a porous membrane.

The invention relates to an underwater structure low-noise damping laying method based on ship three-dimensional acoustic elasticity. The method comprises the steps that S1, a full-three-dimensional dynamic model is established for a structure; s2, adopting a sound radiation characteristic frequency modal identification method; s3, constructing an attention feature mode; s4, constructing an attention mode and a corresponding weight coefficient; s5, constructing a unit damping efficiency data set; s6, outputting the laying damping thickness of the corresponding area according to the damping loss efficiency from large to small for the unit damping efficiency data set; and S7, obtaining structure sound radiation under the excitation load of the laid structure. The method is compact and reasonable in structure and convenient to operate, optimization design of ship structure damping laying is achieved by adopting a full-three-dimensional dynamic model and a modal recognition method and constructing a unit damping efficiency data set and other advanced means, the suppression capacity of the damping structure on vibration and noise can be more comprehensively reflected, and the method is suitable for the ship structure damping laying. The invention provides a more efficient and accurate damping laying optimization method.

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 present invention discloses a method, system, device and storage medium for constructing a three-dimensional sound field with high precision, which can be adapted to any acoustic phased array or metamaterial, including geometric features such as the scale, quantity, position of the transmitting units and the acoustic radiation performance, and is optimized for different types of transmitting units; uses the acoustic holography algorithm, through iterative optimization, makes full use of the performance of the phased array or metamaterial to construct an arbitrary three-dimensional sound field distribution with high precision, such as constructing spatial multi-beams, multi-foci and the distribution of arbitrary sound intensities in space, generating arbitrary acoustic images, etc.; realizes high-precision control of sound energy, including the accuracy of spatial position and distribution intensity, and improves the application experience of acoustic means in the fields of consumer electronics, biomedical engineering and underwater acoustic detection, etc. This acoustic holography algorithm is calculated based on a clear physical process, uses convolution or frequency-domain calculation in the process of calculating sound propagation, has a fast calculation speed, can be calculated in real time, and is used for constructing a real-time three-dimensional sound field distribution with high precision.

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.

The invention discloses a four-dimensional (4D) ultrasonic imaging system and method based on partitioned electrodes and compressive sensing. The backing, the piezoelectric ceramic and the matching layer are sequentially installed in the shell, the positive electrode of the piezoelectric ceramic serves as a sound radiation surface and faces a target area through the matching layer, the backing used for absorbing reflected waves is placed on the negative electrode of the piezoelectric ceramic, and the piezoelectric ceramic is electrically connected with the control circuit through a cable penetrating out of the shell. The space phase mask is installed outside the shell, makes contact with the face, away from the piezoelectric ceramic, of the matching layer and is used for modulating space phase distribution of transmission sound waves. 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, the control circuit is used for controlling independent excitation and receiving of each electrode area, and the negative electrode of the piezoelectric ceramic is grounded. Compared with a traditional phased array device, the complexity and the operation cost of the device are greatly reduced, and the problem that in the prior art, it is difficult to rotate or move a mask to increase additional signal measurement values is effectively solved.

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 speaker assembly is provided. The speaker assembly has a housing and a plurality of transducers supported by the housing. Each transducer has a front radiation surface and a radiation rear surface adapted to radiate sound along a central axis. A transducer depth is defined between the front radiation surface and rear radiation surface. At least one slot is formed in the housing and has a slot opening in the housing for transmitting acoustic radiation from the plurality of transducers. The slot extends a depth dimension of the assembly between the slot opening and a back wall of the housing. The transducer depth is defined between the front radiation surface and the rear radiation surface, wherein the depth dimension of the speaker assembly is less than the transducer depth. The depth dimension is generally perpendicular to the central axes of acoustic radiation of each of the transducers.

The invention discloses a method, system and storage medium for predicting three-dimensional structural sound field under a shallow sea channel, and relates to the technical field of shallow sea environment sound radiation. The method comprises the following steps: setting a point sound source and a surface sound source inside a structural sound source as equivalent sources of the structural sound source; obtaining the strength of each equivalent source based on the surface velocity of the structural sound source and the Green's function of the equivalent source; establishing a sound radiation model using a multi-physics field coupling FEM method; analyzing the directivity of the sound radiation based on the sound radiation model to obtain the far-field distance of the sound radiation of the structural sound source; for the near-field area, obtaining the sound radiation characteristics using the sound radiation model, and for the far-field area, calculating the far-field sound radiation characteristics using the parabolic equation method in a step-by-step manner. The invention combines an equivalent point sound source and an equivalent surface sound source as equivalent sources of the structural sound source, establishes a sound radiation model using the FEM method to calculate the sound radiation characteristics of the near-field area, and uses the parabolic equation method to calculate the far-field sound radiation characteristics, thereby improving the calculation accuracy of the model and ensuring the accuracy of the sound field calculation.