117 results about "Acoustic 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 belongs to the technical field of automatic control, and particularly relates to a large-span ellipsoidal glass structure space noise reduction method based on sound field optimization, and the method comprises the steps: 1, transmitting a sample noise in an ellipsoidal glass structure through a sound wave generator, building a sound wave propagation model to describe the behavior of the sample noise in the ellipsoidal structure, an incident sound field is obtained; 2, analyzing the propagation characteristics of the sample noise in the ellipsoidal glass structure to obtain an acoustic structure coupling equation, and solving the acoustic structure coupling equation to obtain structural vibration displacement; 3, obtaining a sound radiation field of the ellipsoidal glass structure according to the structural vibration displacement; and step 4, combining the incident sound field and the sound radiation field, and performing spatial noise reduction by reflecting the sound pressure of the sound field. According to the method, the problems of poor adaptability and low control precision of a traditional noise reduction method in a non-uniform structure are effectively solved, and the noise reduction efficiency, the control sensitivity and the environment adaptability of a building space are remarkably improved.

The invention discloses an automatic radiation noise simulation method, device and equipment of acoustic finite element software and a storage medium, and relates to the technical field of noise simulation, and the method comprises the steps: obtaining a grid size and a convex hull grid distance according to a geometric model, a material and a frequency input by a user; performing mesh generation on the surface of the geometric model based on the mesh size to obtain a surface mesh; obtaining a convex hull grid based on the convex hull grid distance and the surface grid; generating a tetrahedral mesh in an area between the surface mesh and the convex hull mesh; based on the surface grid, the tetrahedral grid and the convex hull grid, acoustic radiation noise simulation is carried out, full-process autonomous generation from simulation input to grid calculation is realized, and the efficiency problem of grid division and boundary setting depending on artificial experience in the prior art is solved. The calculation precision is guaranteed, meanwhile, the pretreatment workload is reduced to the degree that only basic parameters need to be input, and the operation complexity of radiation noise simulation conducted by acoustic finite element software is reduced.

Various examples are provided related to methods and systems to reconstruct 3D image / map for the stiffness of soft tissues. In one example, a method includes obtaining particle velocities from generated mechanical waves in tissue of a subject; reconstructing a stiffness map of soft tissue in a region of interest (ROI) from the particle velocities; and generating an image of the stiffness map for rendering on a user device. In another example, a system includes an ultrasound scanner for shear wave elastography (SWE) and a computing or processing device that can obtain particle velocities; reconstruct a stiffness map of soft tissue in a ROI from the particle velocities; and generate an image of the stiffness map for rendering. The particle velocities can be generated from acoustic radiation forces produced by the ultrasound scanner.

The invention provides an ultrasonic transducer and ultrasonic cleaning equipment, the ultrasonic transducer comprises a piezoelectric exciter and a vibration radiant panel, the vibration radiant panel is fixed on the piezoelectric exciter, a power supply is electrically connected with the piezoelectric exciter, so that the piezoelectric exciter can generate longitudinal vibration, and the longitudinal vibration of the piezoelectric exciter can excite bending vibration of the vibration radiant panel. The longitudinal vibration sandwich type piezoelectric ultrasonic transducer solves the defects that an existing longitudinal vibration sandwich type piezoelectric ultrasonic transducer is small in radiation area, weak in longitudinal displacement amplitude, long in longitudinal size and the like to a great extent, and has the advantages of being small in space needed by operation, large in sound radiation area and sound radiation power, small in size and the like. The ultrasonic transducer can be widely applied to the application requirements of miniaturization and thinning of the installation space of the ultrasonic transducer. Meanwhile, the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer can be influenced by the length, and / or the width and / or the thickness of the vibration radiant panel, so that the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer is further improved through the size of the vibration radiant panel.

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.

This invention relates to the field of dynamic load section stress monitoring and feedforward adaptive intelligent correction technology for coal conveyor belts in thermal power plants. The invention provides an automatic monitoring and correction device for coal conveyor belts, comprising: a control host that extracts speckle decorrelation index and maps the transverse segregation gradient matrix through a data acquisition and detection module; a rheological state analysis module that introduces a fractional-order calculus dynamics model to analyze the creep stress field and outputs a deformation potential energy time series; a spatial feature prediction module that uses the Koopman operator to elevate the nonlinear system to a linear functional space, identifies outbreak nodes by tracking eigenvalue drift trajectories, and issues early warning commands; and an acoustic field adhesion breaking correction module that drives piezoelectric ceramic elements to construct a local acoustic radiation standing wave field, breaking van der Waals forces to release transverse shear potential energy. This invention solves the risk of belt misalignment and tearing caused by material segregation and adhesion under multi-coal blending conditions.

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 application claims a MEMS frequency accurate tracking and locking method based on a resonant phase-locked loop (R-PLL). The application relates to the technical field of MEMS (micro-electro-mechanical system) resonator control and frequency tracking, and the method takes the output of a voltage-controlled oscillator as an interference signal, takes the physical response (such as weak electromagnetic leakage or acoustic radiation) of a disturbed MEMS device as a feedback signal, compares the phase difference between the feedback signal and a reference signal through a phase detector, adjusts the interference frequency, and forms a closed-loop locking system. The application adjusts the interference source frequency through a phase detector and a filter, can track the target resonant frequency drift caused by factors such as temperature change in real time, makes the MEMS resonator keep in a phase-locked state with the target resonant frequency, and ensures that the interference energy is always efficiently coupled.

Provided is a decontamination device capable of confirming whether a mist circulation dispersion unit is working properly before and after decontamination operation or during decontamination and capable of ensuring the operation of the decontamination device. The decontamination device is provided with a mist supply unit, a mist circulation dispersion unit, and an ultrasonic wave detection unit. The mist supply unit changes a decontamination liquid used for decontaminating the inside of a work chamber into a decontamination mist and supplies the decontamination mist to the inside of the work chamber. The mist circulation dispersion unit makes a vibration plate provided with a plurality of ultrasonic wave transmitters vibrate ultrasonically to generate an ultrasonic wave-based acoustic flow from the surface of the plate to the vertical direction, and makes a pressing action based on acoustic radiation pressure of the acoustic flow act on the decontamination mist to make the decontamination mist circulate and disperse in the work chamber. The ultrasonic wave detection unit is provided with an ultrasonic wave receiver for detecting the operation of the ultrasonic wave transmitters, and detects the operation of the plurality of ultrasonic wave transmitters as a whole and / or each ultrasonic wave transmitter provided in the vibration plate.

This invention discloses a method for measuring the sound power level of woodworking machine tool noise based on the sound intensity method, belonging to the field of machine tool noise measurement technology. Specifically, it includes: determining the housing surface covered by the projection of the tool's rotation plane as the main sound radiation area, and the main bearing seat mounting surface as the secondary sound radiation area; acquiring sound pressure, vibration acceleration signals, and dynamic air pressure signals in the main sound radiation area; resampling the dynamic air pressure signal in the rotational angular domain, extracting the reference air pulse waveform synchronized with the tool tooth sweep, and establishing an airflow-induced sound pressure model based on this and the phase relationship; calculating the surface normal vibration velocity based on the vibration acceleration, and establishing a structural radiation sound pressure model based on the sound wave equation; decomposing the sound pressure signal to obtain estimates of two types of components, and obtaining the net sound intensity of the main sound radiation area after parameter optimization; extracting the vibration frequency band energy of the secondary sound radiation area, calculating the equivalent sound intensity based on the sound radiation efficiency model, and spatially integrating to output the total sound power level. This invention provides an effective method for the accurate measurement and control of woodworking machine tool noise.

This invention relates to a method for rapid three-dimensional acoustoelastic prediction and line spectrum identification of ship mechanical noise based on online equipment vibration monitoring. The method includes: establishing a refined three-dimensional acoustoelastic calculation model for the overall ship vibration and acoustic radiation calculation of the equipment-vibration isolator-base-shell; applying a unit sweep force at the equipment's center of gravity node to obtain the transfer function from the average vibration acceleration spectrum of each equipment's base surface to the radiated noise; multiplying the average vibration acceleration spectrum monitored online in real time with the transfer function to obtain the ship mechanical noise under real-time excitation of each equipment; performing incoherent superposition of the radiated noise from each equipment to achieve rapid three-dimensional acoustoelastic prediction of ship mechanical noise; extracting the line spectrum peak value, and determining the main source of the line spectrum peak value by calculating the energy contribution of each equipment to the line spectrum peak value. This method achieves high-precision online prediction and automatic identification of the line spectrum source of ship mechanical noise, with high computational efficiency and strong engineering applicability.

This application relates to the field of centrifugal pump fault diagnosis technology, specifically to a method and apparatus for centrifugal pump fault diagnosis based on acoustic radiation signal processing. The method involves acquiring the acoustic radiation signal of a centrifugal pump to obtain a test acoustic radiation signal; performing wavelet packet decomposition on the test acoustic radiation signal; processing the sub-frequency band information in different ways to obtain a reconstructed signal; extracting various features from the reconstructed signal; combining the features to obtain a dataset; inputting the dataset into a pre-trained centrifugal pump fault diagnosis model; and outputting the centrifugal pump acoustic radiation signal fault diagnosis result. This application utilizes a combination of wavelet packet decomposition and singular value decomposition for acoustic radiation signal feature extraction, effectively improving the accuracy and efficiency of centrifugal pump acoustic radiation signal fault identification. It can accurately identify centrifugal pump fault types even under strong background noise interference, which is significant for risk warning of centrifugal pump faults.

The invention relates to a rocket takeoff jet flow noise prediction method and system containing multistage water spraying, and belongs to the technical field of aerospace transportation systems.The takeoff jet flow is dispersed into a series of independent point sound sources, sound power and sound radiation characteristics of the point sound sources are established respectively, meanwhile, a control volume is delimited in a jet flow water spraying area, and the control volume is calculated; the jet flow parameter ratio before and after water spraying is calculated, the sound power and radiation characteristics of the point sound source after water spraying are obtained through calculation, and then takeoff jet flow noise after water spraying is obtained; according to the method, takeoff jet noise prediction under different water spraying parameters can be realized, and reference is provided for noise environment design and water spraying scheme design; according to the rocket takeoff jet flow sound source distribution and the rocket takeoff water spraying position, the deflection jet flow noise radiation characteristic and the effective water spraying rate are obtained, the total sound pressure level precision at the takeoff noise peak moment is predicted to be superior to 3dB, the prediction precision of the peak frequency band of the 1 / 3 octave spectrum at the peak moment is predicted to be superior to 3dB, and the method has important engineering application and popularization value.

The utility model discloses a sectional material vibration attenuation structure based on particle damping and a rail train, the sectional material vibration attenuation structure comprises a chassis sectional material of a train body, a plurality of particle dampers are arranged on the upper surface and / or the lower surface of the chassis sectional material, each particle damper comprises a shell and damping particles filled in the shell, and the damping particles are arranged on the upper surface and / or the lower surface of the chassis sectional material. Acoustic radiation energy and / or vibration energy is consumed by the impact and friction between the damping particles. According to the utility model, the full-band vibration magnitude can be effectively reduced, the full-band sound insulation index is improved, the comfort level of passengers in the vehicle is improved, the influence of temperature is avoided, the original structure of the vehicle body is not changed, and the installation is convenient.

The present application relates to a kind of acoustic wind tunnel inside helicopter rotor sound radiation sphere measurement and inversion reconstruction method, it is related to helicopter aerodynamic acoustics wind tunnel test technology and acoustic target characteristic technical field, include: in acoustic wind tunnel using hemispherical far-field noise measuring device measurement helicopter rotor radiated noise, obtain the noise signal of different azimuth of rotor and construct rotor sound radiation sphere model;Based on the sound propagation theory in flow field, construct the propagation model of the surface of sound radiation sphere model to microphone position, and based on the influence of background noise, establish the sound propagation equation of the surface of sound radiation sphere model to microphone in hemispherical far-field noise measuring device;Sound propagation equation is converted to solve least square problem, and the sound source distribution of the surface of sound radiation sphere model is obtained, and the noise of helicopter rotor far field arbitrary position is reconstructed.Can be applied to in acoustic wind tunnel, high background noise and other complex environments reconstruct helicopter rotor sound radiation sphere, carry out practical research and application.

The invention provides a method for analyzing a high-frequency aerodynamic noise field in a closed space, which comprises the following steps of: 1) based on a CAD (Computer Aided Design) model, carrying out computational domain cutting and grid division on a flow field outside the model, dividing the flow field into a sound source area and a noise radiation area, and carrying out local grid encryption on the sound source area to ensure the subsequent turbulence resolution; 2) solving a flow field by adopting a DDES method, and capturing near-field sound source pulsation; 3, the generalized Green function analysis form in the limited space is introduced into an FW-H equation for integration, and far-field noise considering wall and ground boundary reflection is output. The concept is reasonable, the prediction accuracy, comparable with APE, in the tunnel can be obtained, and a new feasible way is provided for rapid evaluation and optimization of high-speed train tunnel acoustic performance.

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.

The invention provides a symmetrical double-end radiation surface hydraulic drive underwater ultralow frequency sounder, which comprises a sound production structure, a control system and a signal generator, the sound production structure comprises a sound cavity, a hydraulic cylinder and a sound radiation surface, the sound cavity is of a hollow structure, two ends of the sound cavity are provided with openings, the middle section in the sound cavity is provided with a partition plate, and the sound radiation surface is arranged in the partition plate. The two sides of the partition plate are respectively provided with a hydraulic cylinder, piston rods of the hydraulic cylinders are fixedly connected with the sound radiation surface and move in the opening direction of the sound cavity, the control system comprises a reversing servo valve, a hydraulic three-way valve and a pump station, an oil outlet and an oil return opening of the reversing servo valve are respectively connected with the pump station through oil pipes, and the hydraulic three-way valve is connected with the hydraulic three-way valve. Two oil ports of the reversing servo valve are respectively connected with two independent hydraulic three-way valves through oil pipes, one hydraulic three-way valve is connected with rod cavities of the two hydraulic cylinders through oil pipes, and the other hydraulic three-way valve is connected with rodless cavities of the two hydraulic cylinders through oil pipes.

The invention discloses a plate shell structure reinforcement layout topological optimization method for sound radiation suppression, and belongs to the technical field of structural acoustics and intelligent optimization design. The method comprises the following steps: 1) establishing a base structure, defining a structure load, boundary conditions, optimization parameters and design variables, and determining the position of a seed point; 2) performing finite element analysis to obtain structural dynamic response; 3) acquiring a real unit set and an empty unit set, and calculating sensitivity; 4) dynamically updating the real unit width by adopting a global moving asymptote algorithm; 5) according to the width of the real unit, introducing a growth competition criterion to guide branches and degradation of the corresponding unit and update the material attribute of the unit to obtain a new reinforcement configuration; 6, whether the optimization process is converged or not is judged based on the target function value, and if not, finite element analysis is carried out again until the optimal reinforcement configuration is obtained.By means of the method, the radiation sound power of the plate shell structure can be effectively reduced, the acoustic performance is improved, the optimized configuration which is clear in boundary and easy to manufacture is obtained, the calculation efficiency is improved, and stability and convergence are guaranteed.

The present application relates to a kind of acoustic radiation fast estimation method of fluid domain structure, belong to acoustic radiation estimation technical field, wherein, the method includes: establishing structure model;Structure model includes the coupling surface of structure and fluid domain, coupling surface includes multiple first surface elements, and first surface element includes structure node;Establish fluid domain model;Fluid domain model also includes above-mentioned coupling surface;The coupling surface of fluid domain model includes the second surface element corresponding to first surface element;First pulsating pressure information on second surface element is obtained by fluid dynamics simulation;Second pulsating pressure information of each structure node is obtained by mapping first pulsating pressure information on second surface element to the structure node on the first surface element corresponding to second surface element by neural network model, by neural network model to the structure node on the first surface element corresponding to second surface element;Second pulsating pressure information is used to determine the acoustic radiation of structure.The present application improves the estimation efficiency and the convergence of calculation of the acoustic radiation of structure with fluid domain.

The application discloses a full-board modal vibration-guiding sound beam structure of a pipa, relates to the technical field of musical instruments, and is installed on a sound beam panel and comprises a main longitudinal beam and a diagonal flow guide beam system arranged on the two sides of the main longitudinal beam. The diagonal flow guide beam system comprises a low-frequency focusing beam and a modal supplement beam. One side of the main longitudinal beam is a bass string area, the low-frequency focusing beam is arranged in the bass string area, the other side of the main longitudinal beam is a treble string area, and the modal supplement beam is arranged in the treble string area. Through the arrangement of the sound beam structure, the sound radiation thickness and the penetrating power are obviously enhanced, the resonance gain of the pipa is improved, and the aftertaste is longer. Moreover, the aftervibration attenuation is smoother, the overtone structure is more stable and clear, and the timbre of the string area is coherent and unified. Meanwhile, the bending stiffness of the sound beam panel is improved, and the structural stability is enhanced.

The invention provides a method for calculating sound and vibration characteristics of a multi-section rotary shell under light fluid, which comprises the following steps of: splitting the multi-section rotary shell into a conical section with a linear generatrix and a hyperbolic section with a nonlinear generatrix according to curvature change characteristics of a meridian line of the shell, and generating node distribution meeting differential quadrature operation in each section; a control equation of the shell is established based on the first-order shear deformation theory, boundary conditions are simulated through an artificial spring, force and displacement continuity of multiple sections of joints is processed, free vibration and forced vibration characteristics are solved through a differential quadrature algorithm, and global speed response is obtained; a fitting unit radiation superposition method is adopted to enable the surface of a shell to be equivalent to an acoustic baffle, a cylindrical surface or a spherical crown surface is adopted to fit and calculate a sound transmission vector according to the type of the shell, and far-field sound radiation characteristics under light fluid are solved in combination with global speed response. The sound and vibration characteristic analysis method provided by the invention has high efficiency, universality and good engineering practicability on the premise of ensuring the calculation precision.

The application discloses a kind of direct radiation component test systems of sea pipe orifice flow noise, including test bench, test pipeline and underwater acoustic sensor, the test bench includes three-dimensional support structure, floating raft shock isolation seat and sea pump;The bottom of the three-dimensional support structure is fixed to the bottom of lake, the top of the three-dimensional support structure is provided with floating raft shock isolation seat, and the floating raft shock isolation seat is located on the water surface;The sea pump is installed on the floating raft shock isolation seat;The outlet of the test pipeline is connected with the inlet of the sea pump, and the water inlet of the test pipeline is the sea inlet;The underwater acoustic sensor is installed at the measuring point in front of the sea inlet.The application also discloses a kind of direct radiation component test methods of sea pipe orifice flow noise.The beneficial effects of the application are that the test method for separating the direct radiation component of sea pipe orifice flow noise can exclude the vibration sound radiation interference of the first sound channel and the second sound channel, and the direct radiation energy of sea inlet flow noise is separated through later data processing.

The application discloses a low-frequency miniaturized electromagnetic-sound radiator and a preparation method thereof, and belongs to the technical field of communication. The electromagnetic-sound radiator comprises, from top to bottom, an upper magnet, an upper magnetostrictive sheet, an upper electrode, a C-axis polarized piezoelectric layer, a lower electrode, a lower magnetostrictive sheet and a lower magnet, and the different layers are bonded by epoxy resin. The upper electrode and the lower electrode are both interdigital electrodes, and the upper magnet and the lower magnet are used for clamping the magnetostrictive sheet-piezoelectric layer composite layer, aiming to improve the stress transmission coefficient. An excitation signal is input from the interdigital electrode, the piezoelectric layer is excited to vibrate, sound wave radiation is generated, meanwhile, the piezoelectric layer vibration is transmitted to the magnetostrictive sheet, and the magnetostrictive sheet is magnetized to oscillate and radiate electromagnetic waves. The application has the characteristics of double modes, small size, low power consumption and strong signal, can significantly reduce the size of a low-frequency communication system, and is especially suitable for emergency communication scenes such as mine communication.

This acoustic unit 10 comprises: an acoustic radiator 11 that is formed in a plate shape having a first surface 11a and a second surface 11b facing the opposite side of the first surface, radiates sound to at least the first surface side by vibrating in an intersecting direction Dv intersecting the first surface and the second surface, and includes a first portion 21 and a second portion 22 that vibrate in the intersecting direction in opposite phases to each other; and an acoustic metamaterial 16 that is disposed on the first surface side and suppresses transmission of a second sound generated accompanying the vibration of the second portion to a space S1 on the first surface side of the first portion from which a first sound generated accompanying the vibration of the first portion is radiated.

The invention discloses a design method of a multilayer composite sound insulation superstructure, which is characterized in that the multilayer composite sound insulation superstructure is designed into an upper substrate, a lower substrate and a rectangular frame body, and a plurality of resonators I and resonators II are respectively arranged on the upper substrate and the lower substrate to form a single-layer superstructure material plate I and a single-layer superstructure material plate II; the interior of the rectangular frame body is filled with a porous sound absorption material, the upper surface and the lower surface of the porous sound absorption material are respectively provided with a plurality of upper holes and lower holes, the upper substrate is in contact with the upper surface of the rectangular frame body, the lower substrate is in contact with the lower surface of the rectangular frame body, the first resonators are respectively inserted into the upper holes, and the second resonators are respectively inserted into the lower holes. A plurality of second resonators are inserted into a plurality of lower holes respectively, the two single-layer superstructure material plates are stacked to form a composite superstructure, sound radiation phases of the composite superstructure at the anti-resonant frequency are counteracted, a sound insulation peak value exceeding a mass law curve is formed, and therefore the sound insulation performance of low and medium frequencies is improved. And the high-frequency sound insulation performance is improved by utilizing an internal porous sound absorption material.

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 discloses a planar sound source with a liquid-filled pipeline, solving the problems of large size, complex operation, poor adaptability, and insufficient low-frequency sound radiation effect in existing structures. The technical solution includes a sound source housing and a piston disposed within the housing. A pressure-regulating cavity is formed between the inner surface of the piston and the housing. A piston rod passes through the housing and connects to a piezoelectric actuator. The pressure-regulating cavity is connected to the measurement environment via a microchannel on the housing, and a shut-off valve is provided on the microchannel. This invention features a simple structure, small size, extremely simple operation, automatic balancing of fluid pressure on both sides of the piston, good low-frequency sound radiation effect, and effectively improved sound radiation efficiency of the piston.