631 results about "Sound energy" patented technology

The invention relates to the technical field of fault monitoring, in particular to a numerical control machine tool fault intelligent monitoring system, which comprises a machine tool data acquisition module used for acquiring operation data and acoustic emission data of a numerical control machine tool; the power analysis module is used for analyzing the consumption state of the spindle motor and adjusting the analysis process; the sound signal analysis module is used for constructing a sound energy abnormal coefficient; the temperature monitoring module is used for constructing a temperature anomaly coefficient according to the cutting area temperature collected in the monitoring period; the risk early warning module is used for analyzing the tool wear state according to the construction result of the motor consumption index, the sound energy abnormal coefficient and the temperature abnormal coefficient in the risk monitoring period and carrying out tool wear risk early warning on a user; the roughness analysis module is used for analyzing the surface quality state of the workpiece; and the control module is used for controlling the feeding speed of the next quality monitoring period. The fault monitoring efficiency of the numerical control machine tool is improved.

The invention discloses an earth and rockfill dam material seepage deformation inspection system and method, and relates to the technical field of earth and rockfill dam engineering.The method comprises the steps that a sample of an earth and rockfill dam material is prepared and arranged in a test cavity of a permeameter; maintaining a steady-state seepage field in the sample; in the maintaining process of the steady-state seepage field, acoustic response signals and thermal response signals excited in the sample due to the seepage effect are synchronously collected through a distributed sensing system arranged around the sample; analyzing the acquired acoustic response signal and thermal response signal, and identifying and positioning an acoustic abnormal area with abnormal sound energy release and a thermal abnormal area with abnormal thermal change; and after the early warning signal is generated, the spatial and temporal distribution characteristics of the acoustic abnormal region and the thermal abnormal region are used as input, a parameter distribution field representing the damage evolution of the microstructure in the sample is calculated through a coupled physical inversion algorithm, and the permeability stability of the sample is evaluated based on the parameter distribution field.

The invention belongs to the technical field of noise reduction devices, and discloses an acoustic black hole combined noise reduction structure embedded with a micro-perforated structure. The device comprises an acoustic black hole cavity, a side cavity and a micro-perforated hole for communicating the acoustic black hole cavity with the side cavity, the acoustic black hole cavity comprises a thin plate array and an acoustic black hole cavity shell; the thin plate array is composed of a plurality of thin plates with round holes in the centers, the outer sides of the thin plates are fixed to the inner side of the acoustic black hole cavity shell, the thin plates are arranged at equal intervals, the centers of the thin plates are coaxial, the inner diameters of the thin plates are arranged in a monotonically decreasing or increasing mode, and an acoustic black hole structure is formed. The side cavity is located outside the acoustic black hole cavity and wraps the acoustic black hole cavity to form a closed space. The low-frequency, medium-frequency and high-frequency full-band noise reduction device is compact and simple in structure, convenient to use, diversified in form, capable of solving the noise reduction problem of low frequency, medium frequency and high frequency of 150 Hz or above, capable of improving the sound energy dissipation efficiency of system noise and wide in application prospect.

The invention discloses a sound production monomer and electronic equipment, and relates to the technical field of sound energy conversion, the sound production monomer comprises a shell, a magnetic circuit system and a vibration system, the magnetic circuit system comprises a support plate, a center magnetic circuit and a side magnetic circuit, the support plate is made of a magnetic conductive material, and a magnetic gap is formed between the center magnetic circuit and the side magnetic circuit; the central magnetic circuit comprises a first magnet, a concentrating flux plate and a second magnet, the side magnetic circuit comprises a first side magnet, a middle side magnet and a second side magnet which are sequentially arranged in the first direction, and the side magnetic circuit can form a magnetic field enhancement side facing the magnetic gap; the vibration system comprises a vibrating diaphragm and an annular voice coil used for driving the vibrating diaphragm to vibrate in the first direction, one end of the annular voice coil is connected with the vibrating diaphragm, and the other end is located in the magnetic gap. The magnetizing directions of the magnets in the center magnetic circuit and the side magnetic circuits are designed, so that magnetic lines of force can be focused at the position of the magnetic conductive plate, the intensity of a magnetic field is greatly improved, a magnetic field enhancement side facing a magnetic gap is formed, and the acoustic performance of the loudspeaker is improved.

The present invention relates to the technical field of sound energy conversion, and disclosed are a sound production apparatus and an electronic device. The sound production apparatus comprises a magnetic circuit system, a first vibration system, a second vibration system, and a housing; the magnetic circuit system is used for forming a first magnetic gap and a second magnetic gap; the first vibration system comprises a first annular diaphragm and a first voice coil, wherein the first voice coil is arranged corresponding to the first magnetic gap; the second vibration system comprises a second diaphragm and a second voice coil; the housing and the first vibration system define a first sound cavity; a side sound outlet hole communicated with the first sound cavity is formed in a side wall of the housing; the housing and the second vibration system define a second sound cavity; and a front sound outlet hole communicated with the second sound cavity is formed in the housing, such that the sound production apparatus can be adapted to a use scenario in which a front sound outlet tube and a side sound outlet tube are provided. Because both the first vibration system and the second vibration system can produce sound, the total radiation area of the sound production apparatus is increased, and the performance of the sound production apparatus is improved.

The present application relates to the technical field of data processing, and relates to a method and apparatus for identifying an abnormal sound of an electric motor, and a computer-readable storage medium, an electronic device and a vehicle. The method comprises: firstly, acquiring rotational speed information and sound time-domain data of an electric motor; determining a sampling frequency that corresponds to the rotational speed information and is required for identifying an abnormal sound; then performing down-sampling on the sound time-domain data according to the sampling frequency; on the basis of the sound time-domain data which has been subjected to down-sampling, analyzing sound energy corresponding to the rotational speed information; and by means of comparing the sound energy with a preset energy threshold value, identifying whether an abnormal sound has occurred in the electric motor. By means of using the technical solution in the present application, the calculation process for identifying an abnormal sound of an electric motor can be simplified, thereby reducing the amount of calculation and the cost for identifying the abnormal sound of the electric motor, and thus identifying an abnormal sound at a fixed order of the electric motor.

The utility model discloses a sounding monomer and electronic equipment, relates to the sound energy conversion technology field, the sounding monomer comprises a housing, a magnetic circuit system, a vibration system and a waterproof sealing ring, the magnetic circuit system is connected with the housing, the magnetic circuit system comprises a magnet assembly, the magnet assembly forms a magnetic gap, and the vibration system is connected with the waterproof sealing ring. The magnet assembly comprises a plurality of magnets which are sequentially arranged in the first direction, and the magnet assembly is provided with a magnetic field enhancement side facing the magnetic gap; the vibration system comprises a vibrating diaphragm and a flat voice coil, the flat voice coil is connected with the vibrating diaphragm and located in the magnetic gap, the axial direction of the flat voice coil is arranged in the second direction, and the first direction is perpendicular to the second direction; the waterproof sealing ring is connected to the side, away from the magnetic circuit system, of the shell and surrounds the vibrating diaphragm, and the shell, the waterproof sealing ring and the vibrating diaphragm are integrally formed through injection molding. The magnet assembly is provided with a magnetic field enhancement side facing the magnetic gap, so that the magnetic field driving force is improved, and the acoustic performance of the loudspeaker is improved.

The invention relates to the technical field of ultrasonic gas meters, in particular to an elastic ultrasonic resonance body and an ultrasonic gas meter sensor and a metering module packaged by the elastic ultrasonic resonance body. The elastic ultrasonic resonance body comprises a piezoelectric assembly, an elastic vibration plate located on one side of the piezoelectric assembly and a conductive connection assembly connecting the piezoelectric assembly and the elastic vibration plate; the elastic vibration plate, the conductive connection assembly and the piezoelectric assembly are assembled in a laminated mode in the axis direction. The elastic vibration plate is a stainless steel plate or a titanium alloy plate; the elastic vibration plate has good elasticity, and the acoustic-electric conversion effect can be improved. According to the ultrasonic gas meter sensor obtained by packaging the elastic ultrasonic resonance body, the arrangement of a matching layer is reduced, sound energy can be gathered during emission, a sound signal is controlled to be transmitted in a narrow sound channel, the sound signal is emitted through a port with a small section, the influence of disturbance flow is reduced, the ultrasonic gas meter sensor is installed at the two ends of a Venturi flow channel to obtain a metering module, and the metering module is used for metering. The flow measurement accuracy and stability can be improved.

The invention discloses an internal wave acoustic feature extraction method based on energy jitter, and the method comprises the following steps: S100, internal wave region acoustic signal preprocessing: sequentially carrying out the filtering processing and noise cancellation processing of a multi-channel acoustic signal obtained by a hydrophone, and obtaining an acoustic signal time-frequency diagram through windowed short-time Fourier transform; and S200, extracting internal wave sound energy jitter characteristics: acquiring data in a specific time period based on the acoustic signal time-frequency diagram, and processing and analyzing frequency point energy to obtain an energy jitter spectrum. The method is high in accuracy, low-frequency and high-frequency signals, carrier noise and background noise are effectively suppressed by comprehensively preprocessing the multi-channel acoustic signals, and subsequently extracted internal wave acoustic features are more accurate and reliable. The method is high in timeliness, the internal wave sound energy jitter characteristics can be extracted from the time-frequency image efficiently, and the internal wave information processing speed is increased to a certain extent.

The invention relates to a motor abnormal sound identification method and device, electronic equipment and a vehicle, and relates to the technical field of data processing, and the method comprises the steps: firstly obtaining the rotating speed information and sound time domain data of a motor; determining a sampling frequency required for identifying abnormal sound corresponding to the rotating speed information; carrying out downsampling on the sound time domain data according to the sampling frequency; analyzing sound energy corresponding to the rotating speed information based on the downsampled sound time domain data; and identifying whether the motor has abnormal sound or not by comparing the sound energy with a preset energy threshold value. According to the technical scheme, the calculation process of motor abnormal sound recognition can be simplified, the calculation amount is reduced, the recognition cost of the motor abnormal sound is reduced, and the motor abnormal sound of a fixed order is recognized.

The invention relates to a monitoring and early warning method and device for coal mine rock burst display. The method comprises the following steps: acquiring ground sound frequency data and ground sound energy data of a target monitoring area in a coal mine in real time; storing the ground sound frequency data into a frequency data set, and storing the ground sound energy data into an energy data set; based on the frequency data set and the energy data set, determining a first relevance index value between the rock sound frequency and the rock sound energy interval in the current rock burst period; based on the energy data set and a plurality of preset energy intervals, determining a second relevance index value between the rock noise energy and the energy intervals in the current rock burst period; according to the first relevance index value and the second relevance index value, the danger degree of rock burst in the target monitoring area is determined, and early warning is carried out based on the danger degree. According to the scheme, the accuracy and timeliness of rock burst early warning are improved.

The embodiment of the invention provides a vehicle-mounted terminal awakening method and device, and relates to the technical field of data processing, and the method specifically comprises the steps: receiving a target voice instruction of a user; obtaining a first score and a second score corresponding to the target voice instruction; the first score is used for representing a probability score of an awakening area of the target voice instruction; the second score is used for representing the sound energy size of the target voice instruction; according to the first score and a corresponding first threshold value, and the second score and a corresponding second threshold value, whether the target voice instruction comes from the outside of the vehicle is judged; and if yes, performing voiceprint analysis on the target voice instruction to obtain target voiceprint information, and awakening the vehicle machine of the vehicle according to the target voiceprint information. According to the invention, the safety of the vehicle in an out-cabin wakeup scene can be improved.

The invention relates to a multi-surface automatic detection method, device and equipment for a vehicle-mounted refrigerator and a storage medium, and the method comprises the steps: extracting image features of the vehicle-mounted refrigerator, and generating an image static detection result; applying vibration excitation for simulating a vehicle driving condition to the vehicle-mounted refrigerator, and synchronously collecting abnormal sound audio data and vibration feedback parameters; abnormal sound energy features corresponding to the abnormal sound audio data are extracted and input into the voiceprint classification model, an abnormal sound type recognition result is obtained, and the current vehicle working condition type is determined according to the vibration feedback parameters; inputting the abnormal sound type identification result, the vehicle working condition type and the image static detection result into a defect classification model to obtain a defect probability list of the vehicle-mounted refrigerator; and if any defect probability exceeds a preset defect threshold value, a detection abnormity report is generated, and the vehicle-mounted refrigerator is transferred to the abnormity to-be-processed area. According to the invention, comprehensive and accurate detection of the vehicle-mounted refrigerator under the static and dynamic working conditions is realized, the detection precision and efficiency are effectively improved, and the high reliability of the product quality is ensured.

The invention relates to a novel noise reduction device aiming at the noise problem in a subway shield tunnel and an evaluation method of the novel noise reduction device. The device is a honeycomb-multilayer composite sound energy absorption device based on a honeycomb structure, the device is composed of a multilayer honeycomb energy absorption pad structure, the reflection frequency of noise entering the absorption pad is greatly increased, and the laying condition of shield tunnel bent duct pieces can be adapted through unitized honeycomb holes. And meanwhile, a vehicle-track-infrastructure vibration noise analysis model containing a fluid domain is established as an evaluation method, so that the noise reduction performance of the device can be evaluated and verified. According to the honeycomb-multilayer composite sound energy absorption device, the porous material with an excellent sound absorption effect is adopted, so that the honeycomb-multilayer composite sound energy absorption device has independent noise reduction capability in structure and material, the composite noise reduction capability is more excellent, the established evaluation method can be suitable for device performance modulation of various scenes, and the evaluation method is suitable for popularization and application. And the method has relatively high universality.

The invention belongs to the technical field of underwater acoustic transducers, and relates to a low-frequency underwater fluid sound production device which comprises a power assembly, a rotating assembly and a transduction assembly which are connected in sequence. The transduction assembly comprises a center shaft and a multi-stage blade type transducer connected to the center shaft in series. The power assembly converts fuel chemical energy into fluid kinetic energy so as to drive the rotating assembly. The rotating assembly rotates under the impact of the power assembly and drives the central shaft of the transduction assembly to rotate so as to convert fluid kinetic energy into mechanical kinetic energy; a blade type transducer of the transduction assembly is linked with the center shaft, so that a blade structure of the blade type transducer rotates and swings, water flow with the flow periodically changing along with time is generated, low-frequency sound radiation is formed, mechanical kinetic energy is converted into sound energy, and low-frequency underwater fluid sound production is achieved. According to the invention, wide-frequency-band and high-power radiation can be realized at the same time, and the sound source intensity is high.

The invention relates to the technical field of oil sludge resource regeneration, and discloses a water oil sludge resource regeneration device based on a composite ultrasonic field and application. The device comprises an oil sludge parameter acquisition module, a resonant frequency analysis module, a sound field coupling control module, a phase shift interference analysis module and a separation strengthening execution module. The oil sludge parameter acquisition module acquires a rheological characteristic data set of the oil-containing sludge in real time; the resonance frequency analysis module generates a dual-target resonance frequency parameter based on the data set; the sound field coupling control module drives the piezoelectric transducer array to generate a focused ultrasonic field, and a sound field coupling model is constructed; the phase shift interference analysis module corrects the phase offset of the model and outputs a multi-band sound energy injection sequence; and the separation strengthening execution module regulates and controls the rotating speed gradient of the mechanical centrifugal unit, triggers membrane stack pulse backwashing, and finally generates regenerated base oil and a purified water phase product. According to the device, efficient regeneration of water-oil sludge resources is realized through cooperation of multiple modules.

The invention belongs to the technical field of hydroacoustic detection, and particularly relates to a high-precision multi-beam sonar with echo noise suppression, the high-precision multi-beam sonar comprises a sonar detector, a transducer and a heater, the transducer is arranged in the middle of the inner side of the sonar detector, and the heater is arranged in the sonar detector. The sonar detector converts electric energy into a sound wave signal through a transducer by arranging the flow guide cover, the honeycomb damping shell, the silica gel damping agent filling layer, the reflection energy absorption frame, the variable-diameter reflection hole and the active isolation mechanism, and the sound wave signal is propagated in water. When sound waves rebound after encountering obstacles and being reflected, the honeycomb damping shell converts sound energy into heat energy through viscous friction of the silica gel damping agent filling layer in the honeycomb damping shell, and the honeycomb structure prolongs the noise propagation time through multiple reflection paths. The active isolation mechanism guides gas in a high-pressure helium tank through a micro air pump and enables the gas to be sprayed out of an air spraying hole, a bubble curtain with the diameter smaller than 1 mm is continuously manufactured to form an impedance abrupt change layer, and the influence of noise is further reduced.

The invention discloses a college dormitory noise multi-dimensional evaluation method based on psychoacoustic and sound field simulation, and belongs to the field of building environment and noise control. The objective of the invention is to solve the problem that an existing dormitory noise evaluation method is single in index and neglects subjective perception and spatial distribution heterogeneity. The method comprises the following steps: acquiring physical data and original audio of dormitory noise through multi-point synchronous acquisition; calculating loudness, sharpness, roughness, fluctuation intensity and comprehensive psychoacoustic annoyance (PA) by using a psychoacoustic model, and scientifically quantifying subjective interference of noise; meanwhile, sound field simulation is carried out based on the accurately established three-dimensional dormitory model, a sound pressure level distribution cloud picture is generated, and a standing wave phenomenon and a sound energy accumulation area are visually revealed; and finally, generating a targeted noise reduction optimization strategy by integrating subjective and objective and spatial analysis results. According to the method, full-chain diagnosis of physical characteristics-subjective perception-spatial distribution of dormitory noise is realized, and a scientific basis is provided for accurate and efficient noise treatment.

The invention relates to a semi-active pressure-resistant low-frequency sound absorption covering layer containing a piezoelectric composite material. The semi-active pressure-resistant low-frequency sound-absorbing covering layer containing the piezoelectric composite material structurally comprises a surface protecting layer which is arranged on the outermost side of the covering layer and converts sound energy into heat energy through a damping effect; the piezoelectric composite material layer is arranged on the inner side of the surface protection layer, converts sound energy into electric energy through a direct piezoelectric effect, and dissipates the electric energy through a shunt branch; the cavity layer is arranged on the inner side of the piezoelectric composite material layer and absorbs sound through a cavity resonance effect, waveform conversion and a damping effect; the substrate layer is arranged on the inner side of the cavity layer to seal the cavity layer so as to absorb sound with a damping effect; wherein the composite material layer is electrically connected with an external shunt branch, and the shunt branch is formed by connecting a negative capacitance element, a resistance element and an inductance element in series.

The invention discloses a sound production monomer and a sound production module, and relates to the technical field of sound energy conversion, the sound production monomer comprises a magnetic circuit system and a vibration system, the magnetic circuit system comprises a magnetic circuit unit, the magnetic circuit unit forms a first magnetic gap and a second magnetic gap, the magnetic circuit unit comprises a central magnetic circuit, a middle magnetic circuit and a side magnetic circuit, the middle magnetic circuit comprises a first middle magnetic circuit and a second middle magnetic circuit, the first magnetic gap surrounds the first middle magnetic circuit, and the second magnetic gap surrounds the second middle magnetic circuit; the vibration system comprises a diaphragm, a first voice coil, a second voice coil and a magnetic assembly, the first voice coil is located in the first magnetic gap, the second voice coil is located in the second magnetic gap, one sides of the first voice coil and the second voice coil are connected with the diaphragm, the other sides are connected with the magnetic assembly, and the current directions of the first voice coil and the second voice coil are the same. The magnetic assembly can provide acting force opposite to the restoring force of the vibrating diaphragm for the first voice coil and the second voice coil, and the performance of the sound production monomer is improved by additionally arranging the magnetic assembly.

The invention provides a fan bearing state evaluation method and system based on a sound energy flow deviation index. The method comprises the following steps: acquiring a plurality of sound signals under the stable operation of a normal fan bearing as reference samples; acquiring a sound signal under the stable operation of the current fan bearing as an evaluation sample; calculating the wavelet packet energy flow of each reference sample and the wavelet packet energy flow of each evaluation sample; calculating a wavelet packet energy flow deviation degree reference value of the wavelet packet energy flow of each reference sample in pairs, and selecting a maximum reference value of the wavelet packet energy flow deviation degree; calculating the wavelet packet energy flow deviation degree between the wavelet packet energy flow of the evaluation sample and the wavelet packet energy flow of any reference sample; if the wavelet packet energy flow deviation degree is larger than the maximum reference value of the wavelet packet energy flow deviation degree, the fan bearing is abnormal, and otherwise, the fan bearing is normal. The method has the characteristics of high evaluation speed and high accuracy.

The invention discloses a neck embedded ring type Helmholtz resonator, which relates to the technical field of low-frequency sound absorption structures and comprises a resonator main body, an embedded neck and a porous material lining. The resonator main body comprises an outer wall surface and a closed cavity; the embedded neck part penetrates through the top wall surface of the main body and comprises a neck part wall surface and an internal periodic convex ring structure; the porous material lining is attached to the inner wall of the closed cavity, and a first gap is formed between the porous material lining and the wall face of the neck. According to the resonator, the sound energy dissipation capacity and parameter harmonility are improved through the neck circular ring, the low-frequency sound absorption capacity is enhanced through the porous material in the cavity, the sound absorption peak value and frequency can be regulated and controlled by adjusting the parameters of the neck and the circular ring and selecting the type of the porous material, and the resonator is simple in structure, wide in application and beneficial to production.

The invention relates to the technical field of sound absorption and noise reduction, in particular to an anti-impact sound absorption and noise reduction lattice superstructure which comprises an array formed by connecting a plurality of sound absorption cavities, each sound absorption cavity is a truncated octahedron formed by a plurality of panels, and the panels comprise eight regular hexagonal panels and six quadrilateral panels. The two adjacent edges of every two adjacent panels are connected through a hollow truss, and a micro hole is formed in the center of each panel. According to the adjustable Helmholtz resonator, the hollow structure is introduced, stress concentration at truss nodes is effectively reduced, the panels are arranged between the adjacent trusses, an internal air phase is constructed through the micropore design, the sound absorption frequency band of the structure is widened, the sound impedance of the structure can be adjusted through the micropores, and therefore the multiple complete adjustable Helmholtz resonators are formed; when the frequency of incident sound waves is close to the inherent frequency of the resonator, the air columns in the micropores generate strong vibration, sound energy is consumed due to the thermal viscosity effect, and the sound absorption and noise reduction structure can have good sound absorption and energy absorption effects while having good mechanical performance.

The invention relates to the technical field of building materials, in particular to a building sound insulation material based on nano material modification. Comprising the following raw materials in parts by weight: 30-50 parts of matrix resin, 8-15 parts of composite filler, 5-10 parts of a composite foaming agent, 4-8 parts of a curing agent, 3-8 parts of a fiber reinforcement, 3-6 parts of an epoxy toughening agent, 3-6 parts of a coupling agent, 2-5 parts of a plasticizer, 1-4 parts of a flame retardant, 0.5-2 parts of an antioxidant and 0.5-2 parts of a curing accelerator. According to the invention, by solving the problem of agglomeration of nanoparticles, uniform dispersion of carbon nanotubes and nano-silica is realized, the uniformly dispersed carbon nanotubes construct a continuous sound energy conduction dissipation channel by virtue of a high length-diameter ratio, incident sound energy is converted into heat energy through multiple reflections and friction, and the nano-silica cooperates with the composite foaming agent to form a uniform porous structure, so that the sound energy can be converted into heat energy. Sound energy transmission is further blocked, and the sound insulation performance is remarkably improved.

The invention provides a method and system for measuring the sound source radiation sound power level in a reverberation pool, and the method comprises the steps: constructing a reverberation test system according to a preset standard, laying a hydrophone array and a to-be-measured sound source in the reverberation pool, and enabling the array element spacing of the hydrophone array to be smaller than or equal to the minimum half-wavelength; enabling the to-be-detected sound source to emit a to-be-detected signal, and collecting complete time domain sound pressure data of the to-be-detected signal; calculating the mean square sound pressure level of the measuring point in the reverberation control area based on the steady-state time domain sound pressure data of the sound signal; calculating complete time domain sound pressure data of all array elements based on Fourier transform to obtain a sound energy density change curve, and fitting the sound energy density change curve to obtain reverberation time; sound field correction is obtained through calculation according to the reverberation time, and the radiation sound power level of the sound source to be measured is obtained according to the sound field correction. According to the invention, the experiment process is simplified, the measurement efficiency is obviously improved, the experiment cost is reduced, and a new technical approach is provided for the rapid measurement of the water pool of the sound source radiation sound power level.

The invention relates to an intelligent fan abnormal sound distinguishing and detecting method and system based on a support vector machine. The method comprises the steps that a fan sound signal and a fan rotating speed signal are collected; identifying the fan sound signal and intercepting a stable section sound signal; a weighting processing is carried out on the sound signal in the stable section so as to obtain sound features reflecting loudness perception of human ears; the fan abnormal sound feature extraction and screening feature extraction analysis method for the sound signals subjected to A weighting processing comprises the steps that a frequency range is divided into 1 / 12 octave of a finer interval, 15 constant bandwidth energy for inspecting the sound energy condition in a fixed bandwidth and an average frequency spectrum for eliminating noise introduced due to instantaneous change; and inputting the extracted and screened fan abnormal sound feature data into a fan abnormal sound intelligent discrimination model of a support vector machine so as to carry out classification prediction on the normal sound and the abnormal sound of the fan. Intelligent detection of the running state of the fan is achieved.

The invention discloses a sound barrier self-adaptive acoustic diffuser regulation and control method, equipment and a medium, and relates to the technical field of sound barrier regulation and control. The method comprises the steps that noise signals on the two sides of a sound barrier are collected, and traffic flow data and meteorological parameters are synchronously obtained; performing multi-scale spectrum analysis on the noise signal to obtain spectrum features; calculating a sound field coupling effect between adjacent units according to the topological connection relationship of the diffuser units; inputting the spectrum characteristics, the traffic flow, the meteorological parameters and the sound field coupling effect into a pre-trained mapping model to generate a regulation and control instruction; the diffuser units are driven to adjust geometric parameters according to the regulation and control instruction, the adjustment priority of the diffuser units is distributed, and the geometric parameters comprise the groove depth and the distance between every two adjacent units. According to the method, the wide-frequency-band noise suppression effect is improved, the sound energy transfer matrix is constructed, the insertion loss contribution rate is calculated, the priority is scientifically distributed and adjusted, and overall performance reduction caused by local optimization is avoided.

An acoustic face mask reduces the distortion and muffling of speech sounds by a face mask wall. The distortion and muffling of speech sounds by a face mask wall may be reduced by reducing the acoustic coupling of the vocal tract and / or nasal cavity to the face mask chamber, which causes a reduction in the intelligibility of the speech. The acoustic coupling of the vocal tract and / or nasal cavity to the face mask chamber may be reduced, for example, by reducing the reflected sound energy caused by the face mask wall. For example, one or more sound absorbing members or acoustically transparent members reduce the reflected sound energy caused by the face mask wall.

The invention discloses a sound production monomer and a sound production module, and relates to the technical field of sound energy conversion, the sound production monomer comprises a magnetic circuit system and a vibration system, and the magnetic circuit system is provided with a first magnetic gap and a second magnetic gap which are arranged at an interval along a second direction; the vibration system vibrates in the first direction, the first direction is perpendicular to the second direction, the vibration system comprises a vibrating diaphragm, a first voice coil, a second voice coil and a magnetic assembly, the first voice coil is located in the first magnetic gap, the second voice coil is located in the second magnetic gap, one side of the first voice coil is connected with the vibrating diaphragm, and the other side of the first voice coil is connected with the magnetic assembly. One side of the second voice coil is connected with the vibrating diaphragm, the other side of the second voice coil is connected with the magnetic assembly, the current directions of the first voice coil and the second voice coil are the same, and the magnetic assembly can provide acting force opposite to the restoring force direction of the vibrating diaphragm for the first voice coil and the second voice coil, so that the driving force of the first voice coil and the second voice coil to the vibrating diaphragm is effectively increased; and the performance of the sounding monomer is improved.

The invention provides a production method of a composite sound absorption suspended ceiling suitable for an airport terminal, and belongs to the technical field of composite sound absorption suspended ceilings. The production method comprises the steps that firstly, the propagation mechanism of sound waves in a composite material is analyzed, the material parameter range required by the optimal sound absorption effect is calculated, the parameter space is divided into six areas, and clustering center points are extracted to make an experiment sample plate; through a sound absorption performance test in an airport terminal environment, multi-band sound wave reflectivity, a micro-vibration spectrum and a sound energy attenuation curve are measured and arranged into an eight-dimensional sound absorption vector matrix. And training the sound absorption parameter effect model. The model is used for carrying out increasing and expanding sampling on material parameters, a large number of parameter combinations and prediction performance are generated, the parameter combinations with the optimal multi-band comprehensive sound absorption effect are screened out, the parameter combinations comprise the micropore aluminum plate with the hole diameter being 0.5 mm, the hole pitch being 15.6 mm and the punching rate being 8%, and finally the micropore aluminum plate and through hole ceramic composite sound absorption suspended ceiling production aiming at the terminal noise characteristics is achieved.