68 results about "Structural acoustics" patented technology

The invention discloses an acoustic black hole structure and a vibration damping device.The acoustic black hole structure comprises an acoustic black hole body and a damping layer, the acoustic black hole body is provided with a uniform thickness area and an acoustic black hole area, the acoustic black hole area is provided with a plurality of grooves, the grooves are distributed from the first end to the second end of the acoustic black hole area, and the damping layer is arranged between the first end and the second end of the acoustic black hole area. The depths of the grooves are gradually increased in the direction from the first end to the second end, and the damping layer is arranged in the acoustic black hole area. By machining the groove in the acoustic black hole area, the local bending rigidity of the acoustic black hole body is changed, the bending wave speed of the acoustic black hole body is reduced, the acoustic black hole effect is achieved, due to the arrangement of the groove, the local resonance effect can be utilized, and then structural vibration suppression in the low-frequency range is achieved; the problem that a traditional acoustic black hole structure is poor in low-frequency-band vibration reduction effect is solved, in addition, thickness cutting of an acoustic black hole area of an original structure is avoided, and the manufacturing difficulty and the requirement for the precision of machining equipment are lowered.

The invention discloses a liquid metal acoustic sensing fiber and a preparation method thereof.The sensing fiber is of a skin-core structure and comprises a skin layer and a core layer, the skin layer comprises a polyurethane elastomer, and the core layer comprises a conductive composite layer composed of liquid metal, nano-silver, carbon nanotubes and the polyurethane elastomer; wherein the conductive particles are liquid metal, nano silver and carbon nanotubes. The skin-core structure acoustic sensing fiber is prepared through the liquid metal, nano-silver and carbon nanotube composite conductive material and a coaxial wet spinning process, the skin-core structure acoustic sensing fiber is excellent in conductivity, stretchable, good in acoustic response performance and sensitive to sound waves of different frequencies, the preparation process is simple, large-scale production is easy, the cost is low, and the material is resistant to electromagnetic interference and high in environmental adaptability.

The application discloses a steel-concrete composite beam crack discrimination method based on bending wave structural sound intensity aggregation degree testing, which comprises the following steps: dividing a to-be-tested plate into a series of scanning areas, setting a scanning path, and calculating the bending wave structural sound intensity aggregation degree; traversing the plate according to a scanning algorithm and calculating the bending wave structural sound intensity aggregation degrees of all areas; calculating the bending wave structural sound intensity aggregation degrees of all areas of the steel-concrete composite beam plate in a service period; comparing the bending wave structural sound intensity aggregation degree spectrum peak values, and if the difference between the bending wave structural sound intensity aggregation degree spectrum peak values of a scanning area of the two exceeds a preset threshold value, it is determined that the scanning area of the steel-concrete composite beam plate in the service period has cracks. The application combines the characteristics that the bending wave signal is easy to test, adopts the bending wave structural sound intensity testing technology and the structural sound intensity aggregation degree scanning algorithm, and can realize efficient discrimination and positioning of the steel-concrete composite beam cracks, and has great theoretical significance and engineering value for damage identification of the bridge.

The application relates to the technical field of anti-interference technology of wearable devices, in particular to a wearable device, a test fixture and a test method. The wearable device comprises a support structure, an acoustic unit and a touch control unit, the acoustic unit and the touch control unit are arranged on the support structure; the acoustic unit comprises a buffering device, the buffering device is arranged between the acoustic unit and the support structure and is used for buffering vibration of the acoustic unit transmitted to the support structure; the touch control unit comprises an information output port, the information output port is used for being connected with a touch sensor of a test device and outputting touch control information of the touch control unit. According to the technical scheme, the basic performance of the wearable device is ensured through structure optimization, meanwhile, defective products caused by variation are intercepted for detection, structure improvement is adopted in cooperation with product detection, a complete quality closed loop is formed, and the product quality is improved.

The invention relates to the technical field of underwater acoustic detection, and discloses a detection method for detecting silver carps and bighead carps on a large water surface based on a side-scan sonar technology, and the method comprises the steps: generating and transmitting an orthogonal multi-frequency coding pulse signal to a water body; receiving an echo signal formed by target scattering of the orthogonal multi-frequency coded pulse signal; processing the echo signal, and extracting a dynamic feature vector reflecting the moving attitude of the target; processing the echo signal, and extracting an actually measured resonance scattering spectrum reflecting acoustic characteristics of the target structure; calling a preset dynamic resonance correlation model based on the dynamic feature vector, and generating a predicted resonance scattering spectrum; and comparing the actually measured resonance scattering spectrum with the predicted resonance scattering spectrum, and calculating to obtain a dynamic matching score. A set of multi-dimensional and high-threshold identification criteria is established by constructing a high-dimensional fusion feature space containing dynamic features and dynamic matching scores and comparing the high-dimensional fusion feature space with a preset standard silver carp and bighead carp target feature domain.

There are disclosed apparatus and methods for encoding and decoding of acoustic environment. In accordance with an example, there is provided an apparatus for decoding an acoustic environment, the acoustic environment including at least one audio source and at least one audio object, the at least one audio object being represented by a structural-acoustic data which links positional data of polygons with acoustic properties of acoustic materials, wherein the positional data includes, for each polygon, the position of the vertexes, the apparatus comprising a bitstream reader for reading, from the bitstream, an encoded version of structural-acoustic data and at least one audio stream to be rendered as generated by the at least one audio source in the acoustic environment. An audio source decoding block to decode the at least one an audio stream representing the at least one audio source. A structural-acoustic data decoding block to decode the structural-acoustic data.

A MEMS having a fluid channel in at least one MEMS layer is provided. The fluid channel is designed to provide fluid connection between a first channel side and a second channel side. The sidewall structure of the fluid channel includes a scallop-shaped component, wherein, due to the scallop-shaped structure, the acoustic channel has an effective acoustic channel width that is enlarged compared to the nominal channel width.

The invention relates to the technical field of structural acoustic detection, and discloses a power transmission tower bolt fastening state detection and positioning method, device, equipment and medium, and the method comprises the steps: transmitting a frequency-adjustable acoustic shock wave excitation signal to a tower bolt connection region, collecting a generated acoustic response signal, carrying out the filtering and envelope demodulation of the acoustic response signal, and obtaining a frequency-adjustable acoustic shock wave excitation signal; the method comprises the following steps: obtaining an effective voiceprint signal, performing multi-scale decomposition on the effective voiceprint signal to obtain voiceprint decomposition signals of a plurality of scales, extracting voiceprint feature vectors of the voiceprint decomposition signals, matching the voiceprint feature vectors with a preset bolt voiceprint feature atlas library to obtain a loose state of a target bolt, and performing positioning inversion on the effective voiceprint signal to obtain a loose state of the target bolt. And obtaining a candidate positioning area of the target loose bolt, and performing semi-supervised learning screening on the candidate positioning area to obtain a target position of the target loose bolt. According to the invention, high-precision automatic identification and rapid positioning of bolt loosening are realized, and intelligence and efficiency of power transmission tower inspection are improved.

The present application belongs to the technical field of building engineering, and particularly relates to a fine construction method for acoustic reconstruction of an ellipsoidal building structure, comprising the following steps: step 1: parameterization of an existing structure; step 2: blocking of a built model contour and sound-absorbing rock wool; step 3: extension of edge coordinates of each block of the model to determine edge coordinates of a positioning support of an outer sleeve-shaped steel; step 4: customization of the positioning support of the outer sleeve-shaped steel; step 5: positioning of the sound-absorbing rock wool on the ground; and step 6: installation of the sound-absorbing rock wool. The present application has the beneficial effect of avoiding repeated adjustment and rework of the sound-absorbing rock wool during paving, ensuring accurate positioning and high-precision construction.

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 application discloses an ultrasonic focal region regulation system and method for realizing focal region localization of shallow tissue, which comprises a transducer, a cavity, a regulation structure, and an acoustic Fresnel zone plate (FZP). The regulation structure can reciprocate along the cavity axis under the regulation of the regulation structure, so as to regulate the focal region form of the ultrasonic wave emitted from the transducer, and then the ultrasonic wave irradiates the cells at the target position. The system can effectively regulate the focal region form of the acoustic field, so as to generate a force field acting on the tissue in the focal region, uniformly output energy, expand the action area, and improve the cell irradiation effect and safety. The complexity of the operation process of the traditional ultrasonic cell irradiation equipment is reduced, the operation frequency and difficulty are greatly reduced, the cell irradiation operator can pay more attention to the optimization of the treatment scheme, and the convenience and efficiency of the treatment are effectively improved. The high-precision acoustic field regulation technology is combined with the humanized mechanical design.

The invention provides an ultrasonic transducer and a manufacturing method thereof. The ultrasonic transducer comprises a shell internally provided with a mounting cavity; an acoustic structure is arranged in the mounting cavity, the acoustic structure comprises at least one acoustic matching layer and at least one piezoelectric array element, the acoustic matching layer is arranged on one side of the piezoelectric array element in the first direction, the other side of the piezoelectric array element is connected with a connecting piece, and the other end of the connecting piece penetrates through the shell to be connected with an ultrasonic diagnostic instrument; the mounting cavity is filled with a sound absorption backing, and the sound absorption backing is arranged around the connecting piece; a transverse absorption layer is arranged around the acoustic structure and is used for absorbing transverse ultrasonic waves emitted by the piezoelectric array elements; the transverse absorption layer absorbs most of transverse ultrasonic waves, so that transverse reflection waves are greatly attenuated, interference of the transverse reflection waves on object reflection waves is greatly reduced, the object reflection waves are converted into electric signals, the electric signals are transmitted to an ultrasonic detector through the connecting piece for signal analysis and processing, and the internal conditions of detected objects are presented more accurately. The detection effect is improved.

The invention provides an acoustic device sound outlet hole dustproof net structure, an acoustic device and a manufacturing method of the acoustic device sound outlet hole dustproof net structure. The acoustic device sound outlet hole dustproof net structure comprises a shell and a dustproof weaving assembly. The dustproof weaving assembly comprises a dustproof weaving net and a welding piece, the welding piece is provided with a weaving containing cavity and a wire hole set, the dustproof weaving net is composed of a first flexible wire set and a second flexible wire set, and the first flexible wire set and the second flexible wire set are interwoven into a net-shaped structure through the wire hole set. The dustproof woven mesh can realize fine aperture control through different weaving processes, meshes are uniformly distributed, foreign matters can be more effectively blocked, local blockage is reduced, and the problem of low aperture control precision of a traditional process is avoided. The aperture ratio can be changed by adjusting the number of the line groups, different scene requirements can be met, the sound field focusing degree can be improved by increasing the line groups, and the sound definition and loudness can be improved by reducing the line groups. If a flexible fiber material is adopted, the deformation resistance can be improved, the line body breakage risk is reduced, the steel sheet is light, thin and flexible, and the problem that a traditional die-cutting perforated steel sheet is difficult to integrate into the light and thin design is solved.

The present application belongs to the technical field of vehicle audio processing, and particularly relates to a song style automatic tuning method based on an artificial intelligence model. The method comprises: obtaining audio to be tuned, vehicle acoustic data and user preference memory, the vehicle acoustic data comprising vehicle structural acoustic parameters and vehicle cabin response data; determining a song style feature vector based on the audio to be tuned, and determining a vehicle acoustic feature vector based on the vehicle acoustic data; generating a target preference memory in response to a user vehicle switching operation; generating a frequency band residual; and determining a target tuning parameter, which is used to control the output of a tuned audio by a vehicle audio processing chain. The present application can take into account the differences in song style, vehicle acoustics and user preferences, and improve the consistency, personalization and cross-vehicle continuity of the tuning result.

The invention relates to the technical field of hydrological monitoring, in particular to a flow measuring device based on ADCP and a flow measuring method thereof.The flow measuring device comprises an annular buoyancy structure, an acoustic Doppler flow velocity profiler, a reversible water pump system and a dynamic positioning system; the method comprises the following steps: controlling the dynamic positioning system, and maintaining the horizontal position of the flow measuring device at a preset target point location to be fixed; when the inclination angle exceeds the preset threshold value, the reversible water pump system is controlled to change the amount of water in the water ballast space, and the gravity center of the annular buoyancy structure is adjusted until the inclination angle of the annular buoyancy structure recovers to be within the preset threshold value; an annular buoyancy structure with an independent variable water ballast space and a vector propulsion unit is constructed, and locking of the horizontal position of the device is achieved through a composite control algorithm based on water flow speed feedforward and position feedback; meanwhile, by dynamically adjusting the water storage capacity of the independent water ballast spaces, stable control over the posture of the device is achieved.

The invention discloses a sandwich structure acoustic material and a preparation method and a wrapping device thereof, and belongs to the technical field of acoustic materials, the sandwich structure acoustic material sequentially comprises an EVA hard layer, a sound absorption outer layer, an aluminum foil damping layer and a sound absorption inner layer from outside to inside, the sound absorption outer layer and the sound absorption inner layer are both made of PU foaming materials, and the sound absorption outer layer and the sound absorption inner layer wrap the aluminum foil damping layer. The outer sound absorption layer is fixedly adhered to the inner side of the EVA hard layer, the aluminum foil is light in weight, high in strength, low in cost and convenient to manufacture, the sandwich structure of the sound absorption layer-damping layer-sound absorption layer formed by the acoustic material is simple in process, and low-frequency energy of 600-1000 Hz can be effectively dissipated, so that the required sound absorption and reduction index is achieved, and the light weight of the structure is kept.

The utility model discloses a motor controller NVH acoustic test tool, which comprises a sample piece supporting table, a damper spring and a supporting base, the damper spring is located between the sample piece supporting table and the supporting base, the sample piece supporting table comprises a body and a plurality of fixing ends arranged on the body and used for fixing a motor controller, and the fixing ends are used for fixing the motor controller. The fixing end is provided with a bolt hole, and a first reinforcing rib is arranged around the bolt hole according to the height and the structural strength of the motor controller supporting foot. According to the motor controller NVH acoustic test tool disclosed by the utility model, a tool jig capable of simulating real installation rigidity is designed, the tool jig structurally comprises the sample piece supporting table, the damper spring and the supporting base, the real installation state of the motor controller is simulated, the test accuracy is improved, and accurate evaluation of structural acoustic performance of the motor controller is facilitated.

The invention relates to the technical field of building drainage, in particular to a balcony drainage health diagnosis device and method based on a gradient structure and deep learning, and the device comprises a preset gradient aluminum plate drainage structure, an acoustic monitoring system, a signal collection and feature extraction module, a deep learning model and a health state diagnosis mechanism. Efficient drainage is ensured through a 3% slope design, a high-sensitivity acoustic sensor is used for collecting water flow acoustic signals, and early warning of blockage is achieved in combination with deep learning analysis. The system can accurately judge the health state of the drainage system, remarkably improves the drainage efficiency, reduces the construction difficulty and maintenance cost, is suitable for a balcony roof scene, and has high practicability and popularization value.

The application relates to the technical field of computational fluid dynamics and structural acoustic simulation, and particularly discloses a fluid-structure-acoustic coupling simulation method and device for an automobile exhaust emission system and a storage medium, which comprises the following steps: constructing a pipeline three-dimensional geometric model of the automobile exhaust emission system; performing finite element grid division on the pipeline three-dimensional geometric model; performing fluid dynamics simulation calculation on the pipeline finite element grid model; extracting flow field load of pipeline fluid characteristics; transferring pipeline flow field load data to a structure grid for fluid-structure coupling analysis according to heterogeneous grid data mapping; performing structural and acoustic coupling simulation analysis according to structural vibration response results; and realizing quantitative evaluation of the aerodynamic noise and structural vibration of the automobile exhaust emission system according to the structural vibration response results and the sound pressure distribution results of the internal sound field of the pipeline. The fluid-structure-acoustic coupling simulation method for the automobile exhaust emission system can realize collaborative analysis of the aerodynamic noise and structural vibration of the automobile exhaust emission system.

The application provides an acoustic switch, comprising a main body and an execution member. The main body is provided with a first opening and a second opening, and a sound guide channel is arranged in the main body and communicates the first opening and the second opening. The execution member is arranged in the sound guide channel. The execution member is configured to deform or offset in the sound guide channel to change the conduction area between the first opening and the second opening when the execution member and the main body are applied with a voltage. Or the execution member is configured to deform or offset in the sound guide channel to change the conduction area when the execution member is applied with a voltage. The acoustic switch applies the voltage to the main body and the execution member or to the execution member, and then generates a coulomb force to drive the execution member to move, without additionally increasing a driving structure such as a motor to drive the execution member to move. The acoustic switch has a small overall space occupation, and is beneficial to the miniaturization of the acoustic switch applied to electronic equipment.

The invention relates to a multi-scale GIS equipment mechanical defect simulation and vibration distribution simulation method based on numerical homogenization, and belongs to the technical field of electrical equipment simulation. Firstly, for two typical bolting and plugging connection mechanisms in GIS equipment, an equivalent model of nonlinear dynamic behaviors of the two typical bolting and plugging connection mechanisms is established based on a numerical homogenization method; multi-scale equivalence from a component scale to an equipment scale is realized through material parameter correction; constructing a GIS equipment finite element model of an integrated equivalent connection mechanism, carrying out electromagnetic-structure multi-physics field coupling simulation, and obtaining vibration distribution characteristics of the equipment in different connection states; a transmission path and power flow distribution of vibration energy in the equipment are analyzed by using a structural sound intensity method. According to the method, efficient and accurate equivalence of nonlinear characteristics of the connecting mechanism is achieved, and an effective simulation analysis means is provided for revealing a correlation mechanism of mechanical defects and vibration characteristics of GIS equipment.

The invention provides a pneumatic grid and structured grid matching loading method. The method comprises the steps that node coordinate information and unit information of a structured grid are acquired; obtaining node coordinate information of the pneumatic grid and corresponding noise load information, and obtaining a sound pressure value on a pneumatic network node based on the noise load information of the pneumatic grid; determining an influence distance by taking the structural grid node coordinate as a circle center, calculating a node distance between the pneumatic grid node coordinate and the structural grid node coordinate at the circle center position, and obtaining a set of coordinate information of a plurality of pneumatic grid nodes and grid unit information thereof in an influence distance range according to a relationship between the node distance and the influence distance; carrying out interpolation on the sound pressure values corresponding to the pneumatic grid nodes in the set to obtain load values of the structural grid nodes; compiling a structural acoustic grid load file based on the load values of the structural grid nodes; and loading the structural acoustic grid load based on the control equation of the structural acoustic grid.

The invention discloses a far-field pickup and interference suppression system based on structure and acoustics collaborative optimization, and the system comprises a sound guide structure assembly, a noise isolation assembly, a microphone array, an acoustics processing module, a system control unit, and a structure-acoustics collaborative module. The sound guide structure assembly is integrated on the equipment body and is used for guiding sound waves in a target direction to the microphone array; the noise isolation assembly is arranged between the microphone array and the equipment shell and is used for attenuating structure propagation vibration; and the acoustic processing module is used for carrying out beam forming, noise suppression and echo cancellation processing on audio signals collected by the microphone array. The beneficial effects of the invention are that integrated design is carried out from a physical structure to a processing algorithm, and structural parameters are introduced to an acoustic processing link; dynamic adaptation and joint optimization of hardware characteristics and a software algorithm are realized, so that the quality and robustness of far-field speech capture are fundamentally improved.

The utility model discloses a sensor for structural sound testing, which comprises a casing assembly, a detection head assembly and a buffer pre-tightening assembly, and is characterized in that the casing assembly comprises a front-end casing, an elastic buffer piece and a rear-end casing which are connected in sequence; the detection head assembly is slidably mounted in the front-end shell; the buffer pre-tightening assembly comprises an elastic pre-tightening piece, the elastic pre-tightening piece acts between the detection head assembly and the rear end shell, and the elastic pre-tightening piece is used for providing forward pre-tightening elastic force for the detection head assembly. During detection, impact energy between the front-end shell and the rear-end shell is absorbed through the elastic buffer part, and axial pre-tightening force is provided for the detection head assembly through the elastic pre-tightening part, so that the detection head assembly can be kept in contact with a detected object, and impact energy between the detection head assembly and the rear-end shell can be absorbed; according to the utility model, the elastic buffering piece and the elastic pre-tightening piece are cooperated to absorb impact energy, so that larger instantaneous impact can be borne without structural damage.

This application provides a method and apparatus for status monitoring of subway flexible DC power supply equipment using an energy router, relating to the field of data processing. Vibration pickup units are arranged on key components of the energy router and time-synchronized. The pickup sequence is aligned with the operating state sequence. Operating segments are divided based on fault ride-through, current limiting, and recovery flags, constructing a structural acoustic spectrum sequence. A steady-state spectrum reference is formed during the steady-state phase. During the recovery phase, attractor regression is used to identify whether the internal state has returned to normal. When deviation persists, implicit recovery is marked as incomplete. Secondary anomalies caused by subsequent load mutations are linked to previous implicit states through spectrum inheritance relationships. Implementing this technical solution facilitates the identification and attribution of implicit recovery failures caused by the incomplete release of slow variables in the control loop, thereby improving the accuracy of status monitoring of subway flexible DC power supply equipment using an energy router.

The invention relates to the field of agricultural detection, discloses a lossless seed maturity detection system, and solves the problems that the existing seed maturity detection technology depends on a single optical mode, so that the detection precision and robustness are insufficient, the misjudgment rate is high, and accurate planting decision support cannot be quickly provided on site. The system comprises a fusion sensing module which comprises a resonance acoustic microscopic unit and a chlorophyll dynamic fluorescence unit and is used for collecting an internal structure acoustic signal and a chlorophyll fluorescence dynamic signal of a seed and constructing multi-dimensional seed characteristic data; the intelligent edge calculation module is integrated with a processor of a preset lightweight artificial intelligence model, and is used for performing feature extraction and data fusion on the acoustic signal and the fluorescence dynamics signal, and reasoning and outputting a seed maturity score; and the interaction module is used for receiving agronomic parameters input by a user, so that the processor generates planting decision suggestions based on the maturity score and the agronomic parameters, and displays the maturity score and the planting decision suggestions.

A system for operating a power supply system of a train compartment, the system comprising: at least one first sensor and / or at least one second sensor for measuring data relating to sound pressure in an interior space of the train compartment; at least one third sensor for measuring data relating to an output of the power supply system; a processor configured to: process measurement data from one or more of the at least one first sensor, from the at least one second sensor, and from the at least one third sensor; and adjusting an operating point of the power supply system based on the processed measurement data in order to reduce sound pressure in the interior space of the train compartment.

This invention belongs to the field of anti-reverse equipment technology, specifically relating to a roller backstop crack monitoring device and its installation method. The outer shell of the roller backstop body has a groove on its surface, which does not penetrate the outer shell. A coupling layer is located at the bottom of the groove, and an acoustic sensor is partially disposed on the coupling layer within the groove. The monitoring device also includes a fastening device, which is positioned above the acoustic sensor. The fastening device applies stress to the bottom of the groove by connecting to the outer shell of the roller backstop body. This invention, through the local acoustic isolation of the groove structure, impedance matching of the coupling material, and the stress regulation mechanism introduced by the fastening device, constructs a detection environment conducive to structural acoustic wave focusing and sensing, improving the ability to perceive early-stage roller crack acoustic signals and effectively solving the technical problems of "weak early signal, large path attenuation, and strong noise interference" in traditional acoustic monitoring methods.