45 results about "Structural acoustics" patented technology

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 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 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 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.

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.

Provided is an optical fiber sensor that is capable of highly accurately detecting an abnormality in a structure from vibration information. This optical fiber sensor includes an optical fiber that is laid in the vicinity of a structure, a light source for introducing pulsed light of a specific period into the optical fiber, and an optical sensor for detecting return light that has been obtained as a result of the introduction of the pulsed light into the optical fiber. The structure is determined to have an abnormality if the spectral centroid of vibration information exceeds a threshold.

This invention provides an artificial intelligence-based method for identifying defects in building structures, relating to the field of deep learning. The method includes: acquiring structural observation image sequences, structural vibration response sequences, and structural acoustic wave propagation sequences to construct a set of structural observation units; extracting multimodal features based on spatial alignment to form a set of structural feature expressions; further constructing a lining structure interface state discrimination model and predicting the interface state; identifying potential voiding areas by combining vibration propagation anomaly analysis; and fusing spatial features of the prediction results and anomaly analysis results to construct a spatial voiding probability distribution. Finally, generating lining structure defect identification results through spatial threshold discrimination and region mapping. This invention can improve the accuracy of identifying latent defects such as early micro-voiding at the surrounding rock lining interface of deep underground building structures.

The utility model relates to the field of automobile manufacturing, and discloses an acoustic bag assembling and splicing structure which comprises a first acoustic bag, a second acoustic bag is arranged on the outer wall of the first acoustic bag, a screw hole is formed in the surface of the second acoustic bag, a bolt is connected to the inner wall of the screw hole in a threaded mode, a connecting strip is fixedly connected to the outer wall of the first acoustic bag, and the connecting strip is fixedly connected to the outer wall of the first acoustic bag. A dovetail groove is formed in the outer wall of the connecting strip, a dovetail block is fixedly connected to the outer wall of the second acoustic bag, an avoiding groove is formed in the inner wall of the connecting strip, a magnetic ring is fixedly connected to the inner wall of the avoiding groove, a magnetic block is magnetically connected to the top of the magnetic ring, and a sound insulation assembly is arranged on the surface of the connecting strip. According to the acoustic bag splicing structure, by arranging the connecting strips, the dovetail grooves, the dovetail blocks and other structures, when the acoustic bag is quickly spliced, gaps at splicing seams can be made up, sound leakage at the weakest position of the spliced acoustic bag is avoided, and the splicing effect is improved.

A swirl recovery vane with structurally capable acoustic treatment including a leading edge and a trailing edge opposite chordwise from the leading edge; an attachment region opposite spanwise from a tip region; a span dimension extending between the attachment region and the tip region; a chord dimension extending between the leading edge and trailing edge; a pressure side opposite a suction side of the swirl recovery vane; a structural feature formed within the swirl recovery vane extending at least one of spanwise through the swirl recovery vane between the attachment region and tip region and / or chordwise between the leading edge and the trailing edge; an acoustic receiver formed within the structural feature extending at least one of spanwise through the swirl recovery vane between the attachment region and the tip region or chordwise between the leading edge and the trailing edge; and an acoustic panel inserted into the acoustic receiver.

The invention discloses a model simplification method for calculating acoustic reflection characteristics of a ribbed plate type structure, which comprises the following steps of: firstly, constructing a solid plate model and a shell plate model, and comparing acoustic reflection characteristic parameters under the two models to determine whether the two models can be mutually simplified or not; on the basis of mutual simplification, three types of models of'solid plate + rib ', 'shell plate + rib' and'shell plate + beam 'are respectively constructed, then acoustic reflection characteristic parameters under different models are compared and analyzed, and an equivalent relationship between the models is established. According to the method, step-by-step equivalent simplification from a high-dimensional entity model to a low-dimensional structure model is achieved, the calculation efficiency is improved, and the method can be used for underwater acoustic scattering analysis, structural sound reflection characteristic research and large-scale parameter calculation and has good engineering application value.

The invention belongs to the technical field of sound field calculation, and particularly relates to a sound field calculation method, program and equipment for an open cylindrical cavity embedded rigid spherical scatterer based on modal matching and spectrum expansion and a storage medium. Unified solution of intra-cavity scattering and outer domain radiation is realized through a column mode expansion and sphere-column wave function interchange relation, a mode radiation impedance matrix is constructed to eliminate an outer domain unknown spectral quantity by using a Somerfeld spectrum to naturally meet an outer radiation condition, and a numerical solution analysis framework is formed. According to the method, the calculation efficiency is remarkably improved while the geometric accuracy is guaranteed, and the method is suitable for sound field prediction and optimization design of a complex perforated structure, acoustic material and vector sensor integrated system.

The structural sound device for realizing large non-reciprocal transmission of sound energy by NES comprises a sound cavity I, a pipeline, a sound cavity II, a diaphragm and a sound cavity III, the pipeline is connected with the sound cavity I and the sound cavity II at two ends respectively, the sound cavity II is installed in the top surface of the sound cavity III in the middle, and a through hole III is arranged in the middle of the connection of the two sound cavities; the diaphragm is installed between the sound cavity II and the sound cavity III through a clamp and completely covers the through hole III. The sound cavity I and the sound cavity III are respectively provided with a through hole I and a through hole II on the side surfaces, a volume velocity sound source is connected with the sound cavity I through the through hole I and the through hole II is closed when forward excitation; the volume velocity sound source is connected with the sound cavity III through the through hole II and the through hole I is closed when reverse excitation. The application also provides a verification method of the structural sound device for realizing large non-reciprocal transmission of sound energy by NES. The application realizes large non-reciprocal transmission of sound energy by using the characteristics that the targeted energy transfer occurs when forward excitation and no targeted energy transfer occurs when reverse excitation, and provides a method for pipeline low-frequency noise control.

The invention relates to a transmission device (22) of a structural sound transducer (28) for introducing vibrations into a planar body, comprising an excitation unit (18) and a receiving unit (20), the transmission device (22) being mountable on the planar body and being in vibration connection therewith. According to the invention, the transmission device (22) comprises a central region (12) for receiving the receiving unit (20), the central region (12) being provided with at least two arms (14, 16), the arms (14, 16) being arranged in the circumferential direction of the central region (12) and extending radially away from the central region (12), in particular in the form of a strip, the central region (12) forming a first transmission unit (10) together with the arms (14, 16). According to the invention, the first transmission unit (10) is configured to be connected to the second transmission unit (24).

Techniques for improving acoustic wave device structures are disclosed, including filters, oscillators and systems that may include such devices. First and second layers of piezoelectric material may be acoustically coupled with one another to have a piezoelectrically excitable resonance mode. The first layer of piezoelectric material may have a first piezoelectric axis orientation, and the second layer of piezoelectric material may have a second piezoelectric axis orientation that substantially opposes the first piezoelectric axis orientation of the first layer of piezoelectric material. The first and second layers of piezoelectric material have respective thicknesses so that the acoustic wave device has a resonant frequency that is in a super high frequency band or an extremely high frequency band.

The utility model relates to a fixing structure, an acoustic bag mounting structure, an electric driving system and a vehicle. The fixing structure comprises a mounting boss, a gasket and a connecting piece, and the mounting boss is assembled and fixed with the gasket through the connecting piece; the gasket comprises an outer gasket and an inner gasket arranged on the outer gasket, and a crack used for clamping an acoustic bag is formed between the outer gasket and the inner gasket. The utility model further provides a mounting structure of the acoustic bag. The mounting structure comprises the fixing structure. The utility model further provides an electric driving system which comprises the acoustic bag installation structure. The utility model further provides a vehicle which comprises the electric driving system. According to the utility model, the problem of poor reliability of the fixing structure of the existing acoustic bag is solved, and the manufacturing difficulty of the electric drive and the acoustic bag is also reduced.