67 results about "Noise energy" patented technology

The invention relates to the technical field of power equipment fault diagnosis, and particularly discloses a pole-mounted circuit breaker mechanical fault diagnosis method and system, and the method comprises the steps: firstly, synchronously collecting a dynamic force-displacement signal, a high-frequency acoustic emission signal and a broadband vibration signal in the switching-on and switching-off process of a circuit breaker operating mechanism; then, the acoustic emission and vibration signals are decoupled into an impact source component and a friction source component which are statistically independent through a blind source separation algorithm; performing envelope spectrum analysis on the impact source component to extract impact characteristics, and performing energy calculation on the friction source component to obtain friction noise energy characteristics; finally, on the basis of dynamic force-displacement curve fitting analysis, in combination with impact characteristics and friction noise energy characteristics, distinguishing and delimiting of mechanical wear and lubrication degradation faults are achieved. According to the invention, the problem that the existing diagnosis technology cannot effectively identify and distinguish the coupling fault of mechanical wear and lubrication deterioration is solved, and early warning and accurate diagnosis of the mechanical fault of the pole-mounted circuit breaker are realized.

The invention discloses a distribution network power line anti-interference communication method based on adaptive filtering, and belongs to the technical field of distribution network power line communication. According to the method, a communication signal adopting a frequency shift keying modulation mode is acquired from a power line coupler of a distribution network through a signal acquisition module, the communication signal is preprocessed by using a digital signal processing unit, spectral analysis is performed on the preprocessed signal, and characteristic parameters of interference noise are extracted; a coefficient vector of a finite impulse response adaptive filter is initialized based on the characteristic parameters, the order of the filter is in direct proportion to the reciprocal of the dominant interference frequency, fine adjustment is carried out based on noise energy distribution through a table look-up method or a linear mapping relation, and the weight coefficient of the filter is adjusted in real time in the communication process. The adjustment step length is dynamically adjusted according to the real-time estimated signal-to-noise ratio, and finally, the processed signal is output through the adaptive filter and data demodulation is carried out. The method is mainly used for improving the anti-interference capability and the communication reliability of the power private line communication of the distribution network.

The embodiment of the utility model discloses a testing device and system for friction noise of a handheld moving coil microphone, and the device comprises a testing main body, the testing main body comprises a testing part and a stabilizing part, and the side surface of the testing main body is transversely provided with a handheld control rod; the testing part comprises a fixed outer ring, and a rubber ring is arranged in the fixed outer ring; the stabilizing part comprises a balancing weight connected to the fixed outer ring through a long bolt, and the balancing weight is arranged on the opposite side of the rubber ring. According to the testing device, the rubber ring is arranged to simulate a human hand, the external part of the handheld moving-coil microphone is directly contacted when the testing device is used, so that the noise generated by friction in the using process of the handheld microphone is simulated, the structure is simple, the noise is convenient to use and collect, and standardized collection can be formed; and multi-dimensional evaluation analysis is carried out on the friction noise from the dimensions of noise energy, spectral characteristics and the like to form comprehensive performance indexes.

This application relates to the field of monitoring data processing technology, and particularly to a method, device, and storage medium for preventing monitoring data from being tampered with. The method includes: during the recording of monitoring data, simultaneously acquiring a thermal noise segment from an imaging sensor for each video frame, reducing equipment costs and deployment difficulty; calculating the image activity metric of the video frame and the noise energy metric of the thermal noise segment, requiring minimal computation and meeting the simple real-time needs of ordinary monitoring equipment; performing an arithmetic combination of the image activity metric and the noise energy metric to obtain a frame verification feature value, which is then associated with and stored with the video frame, making it difficult to forge and having low storage overhead; acquiring the video frame to be verified and generating a verification feature value based on the video frame; determining that the monitoring data has been tampered with when the deviation between the verification feature value and the stored verification feature value exceeds a preset range, thus achieving low-cost, low-complexity, and high-real-time monitoring data integrity protection.

The embodiment of the invention discloses an extended target detection method, belongs to the technical field of radar detection, and solves the problem that the detection performance is reduced due to the fact that excessive noise is introduced or target energy is omitted during energy accumulation in an existing extended target detection method. Comprising the following steps: constructing a dynamic planning accumulation detection model of a distance extension target based on an echo matrix; on the basis of the minimum energy loss criterion, balancing parameters are configured for the value function, a double-probability joint constraint optimization model about the target energy and the noise energy is established, and the balancing parameters are determined by solving the optimization model; updating a value function and a state transition matrix of the joint state variable among the plurality of pulses through recursive operation based on the trade-off parameter; and for the value function obtained after updating is completed, extracting a corresponding energy ridge line, constructing an approximate probability model of the variation amplitude of the energy ridge line, and obtaining a target extension length value by solving an optimal variation threshold of the approximate probability model under a preset false alarm probability.

The application discloses a low-noise tire pattern pitch optimization method and device based on image processing and a medium, and the method comprises the following steps: S1, processing initial pattern information and calculating pitch length; S2, extracting groove boundaries and tire mark boundaries of a pattern pitch graph; S3, inputting basic parameters such as pitch and mark; S4, introducing an A-weighting filter for acoustic weighting; S5, calculating an initial noise spectrum; S6, optimizing a spectrum peak value in a harmonic range; S7, iteratively adjusting a pitch ratio and quantity until noise energy meets a threshold value, and outputting an optimal pitch sequence. Through the fusion of image processing technology and acoustic analysis, the pattern pitch design is systematically optimized, tire noise is significantly reduced, design efficiency is improved, and a research and development cycle is shortened.

The present application relates to the field of rail transportation, in particular to a full-closed sound barrier for rail transportation, comprising a first sound barrier and a second sound barrier, a first channel and a second channel are formed on both sides between the first sound barrier and the second sound barrier, and a sound-absorbing assembly is arranged in the first channel and the second channel, the sound-absorbing assembly is provided with a first sound-absorbing module and a second sound-absorbing module, and a flow path for air circulation is formed between the first sound-absorbing module and the second sound-absorbing module, air flows through the flow path formed by the first sound-absorbing module and the second sound-absorbing module, noise energy is effectively reflected, scattered and absorbed during the propagation process, thereby effectively attenuating the sound wave intensity, greatly reducing the noise level, and gradually weakening the sound wave intensity. The present application also relates to a mounting method of the full-closed sound barrier for rail transportation.

This invention relates to a low-noise optical module three-temperature testing device, comprising a test box with a test cavity formed inside. An air inlet pipe is connected to the test box and communicates with the test cavity. A first silencing cavity is also formed inside the test box, and a first exhaust channel communicating with the first silencing cavity is provided on the test box. A duct is also connected to the test box, connecting the test cavity and the first silencing cavity. By setting up the first silencing cavity and connecting it to the test cavity via the duct, this invention not only extends the gas flow path within the test box and serves to store airflow, but also significantly increases the gas flow area and the diffuse reflection area and number of reflections within the test box, thereby reducing gas velocity and noise energy, achieving noise reduction. The test cavity-duct-first silencing cavity can form a Venturi effect, resulting in better noise reduction.

The invention relates to the technical field of household appliances, and discloses an air purifier which comprises a shell provided with an air inlet, an upper air outlet and a lower air outlet; the upper air duct assembly comprises a first air duct communicated with the air inlet and the upper air outlet and a first wind wheel arranged in the first air duct; the lower air duct assembly comprises a second air duct communicated with the air inlet and the lower air outlet and a second wind wheel arranged in the second air duct; the first wind wheel and the second wind wheel are different in size. The upper air outlet and the lower air outlet are formed in the shell, the upper air outlet and the lower air outlet discharge air at the same time, purification dead angles can be reduced, the air purification uniformity of areas with different heights in a room is improved, the two air wheels are designed to be different in size, the originally-stacked noise peak value can be scattered into broadband noise more evenly distributed, and the air purification efficiency is improved. The operation frequency of the wind wheel is staggered, noise frequency spectrum overlapping is avoided, noise energy is changed into dispersed distribution from concentrated superposition, and therefore the operation noise of the whole machine can be remarkably reduced.

The noise reduction air duct of the blower comprises an air inlet channel, an air outlet channel and an air outlet channel, wherein the air inlet channel is provided with a first air inlet port and a second air inlet port; the air outlet channel is provided with a first air outlet port and a second air outlet port; wherein the first air inlet port is connected with the airflow inlet; the first air outlet port is connected with the airflow outlet; in the working state, the second air inlet port is communicated with the second air outlet port; the air inlet channel is arranged around the air outlet channel in a surrounding mode. The air blower has the advantages that noise formed in the air outlet channel area can pass through the hollow interlayer structure of the air inlet channel when being transmitted to the outside of the air blower. The hollow interlayer structure has a good noise reduction effect, and the action mechanism at least comprises that a noise transmission path can pass through a plurality of dielectric layers such as solid, gas and solid, and the surface of each dielectric has a strong noise energy weakening effect; and moreover, the dynamic air flow with the lower flow speed in the air inlet channel has a better sound wave energy adsorption effect, and the overall low-noise effect is obvious.

The existing counterfeit speech detection method has weak robustness in the re-encoding and noise mismatch scene, in order to improve the robustness of the existing method, the counterfeit speech detection research work puts forward the strategy of data augmentation to the training data set. However, the data augmentation strategy can increase the training data quantity, reduce the model training efficiency, and can only be used for known encoding algorithm and noise difference scene. The present application relates to the field of counterfeit speech detection, especially to the field of counterfeit speech detection for re-encoding and noise interference scene, specifically relates to a counterfeit speech detection algorithm and system based on subject filtering, mainly designs a subject signal filtering module based on the relationship between the human ear hearing masking effect and the signal-to-noise energy ratio, which can eliminate the part causing the distribution difference in the spectrogram feature, at the same time, without increasing the training data quantity, can improve the robustness of the model in the unknown encoding algorithm and noise difference scene, and has good universality.

The application relates to the technical field of smart grids, in particular to a power grid flexible load collaborative optimization scheduling system for high-proportion new energy access. The system comprises a data acquisition module, which acquires voltage data of a new energy access port; a low-frequency oscillation analysis module, which obtains a voltage fluctuation sequence of a current monitoring period according to the fundamental frequency characteristics of the voltage data of the current monitoring period; and obtains low-frequency oscillation energy degrees of different time periods according to the difference between noise energy characteristics and total energy characteristics of the different time periods in the voltage fluctuation sequence; and a low-frequency oscillation suppression module, which obtains an adaptive Kpss gain parameter of a next monitoring period according to the change trend and size of the low-frequency oscillation energy degree in the current monitoring period, and suppresses low-frequency oscillation in the voltage of the new energy access port in the next monitoring period. The application adaptively obtains the Kpss gain parameter, improves the stability of the voltage of the new energy access port, and further improves the accuracy of the power grid flexible load collaborative scheduling.

The application provides a carrier communication network noise absorption system, which comprises a power supply unit for supplying power for the system, a noise and PLC signal coupling unit for accessing a power line, a coupling capacitor and a coupling transformer circuit for filtering and outputting noise and PLC signals in the power line, and a PLUS pulse signal for reflecting whether the signal in the power line is a valid PLC signal according to the leading wave characteristics of the PLC signal package header; a noise absorption unit connected with the noise and PLC signal coupling unit, for applying different loads on the noise source of the power line, so that the noise energy is converted into heat energy and the noise voltage amplitude is reduced; and a PLC signal analysis unit connected with the noise and PLC signal coupling unit and the noise absorption unit, for performing peak value sampling on the noise and PLC signals output by the noise and PLC signal coupling unit, judging whether the current signal is a PLC signal or a noise signal, and controlling different loads to absorb the noise.

The invention discloses a double-base-end radio array airborne radar clutter suppression method and system, and relates to the technical field of airborne radars, and the method comprises the following steps: obtaining attitude angles, position coordinates and velocity vector data of a transmitting end and a receiving end, and reconstructing a geometric baseline between the two ends under a unified reference system; performing space-time joint analysis on the echo signal under the constraint of a geometric baseline to generate a clutter spectral surface; constructing a space-time filtering weight vector according to the angle and frequency distribution characteristics of the clutter spectral surface; applying local sparse constraint to suppress noise energy in combination with filtering output; and performing multi-channel coherent superposition on a processing result to realize signal energy aggregation. Through geometric baseline constraint and clutter spectral surface construction under a unified reference system, the space-time filtering direction is adaptively matched with a clutter structure, and the clutter suppression stability under an asymmetric configuration is improved; and in combination with local sparse constraint and multi-channel coherent energy aggregation, the target echo prominence is enhanced, and the weak and small target detection capability in a complex clutter environment is improved.

The invention discloses a method, a device, equipment, a medium and a product for processing noise in a nuclear power master control room. The method comprises the following steps: acquiring a target noise signal according to an identification request for the target noise signal in a nuclear power master control room, and determining initial noise data corresponding to the target noise signal; generating a noise energy distribution diagram of the target noise signal in the nuclear power master control room according to the initial noise data; according to the noise energy distribution diagram, black hole structure parameters and installation strategies of acoustic black holes are determined; and configuring the acoustic black hole according to the black hole structure parameter and the installation strategy to obtain a target acoustic black hole, and controlling the target acoustic black hole to perform noise reduction processing on the target noise signal to obtain a noise reduction processing result of the target noise signal. According to the embodiment of the invention, noise reduction processing can be performed on the noise signal by using the target acoustic black hole, accurate processing of noise with different characteristics in the nuclear power master control room is realized, and the efficiency and stability of noise processing are improved.

The present application relates to underwater acoustic engineering, sonar signal processing and harmonic detection technical field, especially a kind of jammer equipment identification method based on retransmission harmonic feature, first the active sonar echo signal obtained is carried out matching filtering and sampling, then using cepstrum algorithm to extract its corresponding cepstrum, finally the obtained cepstrum is detected without direct current component, whether the target is jammer equipment is judged by the ratio of non-direct current component and noise energy.The present application utilizes the retransmission mechanism of underwater decoy target, exposes its harmonic signal characteristics through matching filtering, and on this basis, relies on harmonic signal identification means to identify and eliminate it.The present application effectively improves the identification ability of jammer equipment, and the algorithm process is simple, the calculation complexity is low, the portability is strong, provides an important component module for constructing the detection and identification system of underwater target.

The invention provides a digital orthogonal phase-locked amplifier based on a Sigma-Delta modulator. Comprising a Sigma-Delta modulator, a digital low-pass filter, an orthogonal phase-locked amplifier, a dynamic threshold module and a scaling multiple calculation module, the output end of the Sigma-Delta modulator is electrically connected with the input end of the digital low-pass filter, and the Sigma-Delta modulator is used for performing noise shaping on an input digital signal, converting the input digital signal into a high-speed low-resolution digital pulse stream and pushing quantized noise energy to a high-frequency area outside a target frequency band; the output end of the digital low-pass filter is electrically connected with the input end of the orthogonal lock-in amplifier, and the digital low-pass filter is used for filtering high-frequency quantization noise and downsampling a high-speed pulse flow into a high-precision multi-bit digital signal in a target frequency band, and the high-dynamic-range and low-noise weak signal detection can be realized on the premise of low cost.

The application discloses a radar target high-resolution estimation and distance ambiguity suppression method based on MUSIC-AP. Firstly, echoes of different distance sections in a CPI are preprocessed to obtain multiple single-shot data, an imaging function is formed, and local maximum values of the imaging function are identified as a distance frequency set and converted into distance information of scattering points; then, complex amplitude information of the scattering points is obtained by combining a least square method to reconstruct echoes of different distance sections; by using an alternating projection (AP) algorithm, ambiguous echo energy and noise energy of non-target distance sections are gradually suppressed, and echo reconstruction precision and de-ambiguity performance are further improved; and complex amplitude information of different pulses of different distance sections after convergence is used again to obtain a velocity frequency set by using a MUSIC high-resolution algorithm, and the velocity frequency set is converted into velocity information of the scattering points.

This invention provides a method for coordinated control of vibration and noise in mine blasting, relating to the field of blasting control technology. The method includes: acquiring historical blasting data to train a vibration and noise response prediction model; using geological parameters of the area to be blasted as fixed inputs and blasting parameters as optimization variables, inputting the blasting parameters into the model to generate an energy field distribution, determining overlapping high-risk areas with a safety threshold as the boundary, and iteratively optimizing to generate the optimal blasting parameter set with minimizing its area; inputting this into a coupled response model, decomposing vibration and noise energy components through wave field separation and generating time history curves; extracting the dominant frequencies of vibration and noise to calculate a frequency domain matching index, calculating a time domain peak shifting index based on the peak time difference; if both indices satisfy the constraints, executing the blasting operation; otherwise, adjusting and iterating again, thereby achieving coordinated control of vibration and noise.

The application discloses a noise power level determination method and device, a storage medium and a computer device. The method comprises the following steps: controlling the joint movement of a robot, and recording corresponding robot noise audio; determining the noise energy corresponding to each joint when the joints move respectively according to the robot noise audio; and determining the overall noise power level of the robot according to the noise energy. The application solves the technical problem of low overall noise measurement efficiency of the robot.

The invention belongs to the technical field of noise energy harvesting, and particularly relates to an adjustable sound absorption energy harvesting device and electronic equipment. The adjustable sound absorption energy harvesting device comprises a sound absorption structure which comprises a containing shell with a containing cavity and an adjusting baffle connected with the containing shell in a sliding mode, and the cavity top of the containing cavity is provided with a tuning slit communicating with the external space; the energy harvesting structure comprises a micro-perforated plate located in the containing cavity and a piezoelectric plate arranged at an interval with the micro-perforated plate, the edge of the micro-perforated plate is connected with the cavity wall of the containing cavity, and the piezoelectric plate is located at the cavity bottom of the containing cavity; the adjusting baffle has a first position state and a second position state, and when the adjusting baffle is in the first position state, the adjusting baffle completely shields the tuning slit; when the adjusting baffle is in the second position state, the adjusting baffle at least partially opens the tuning slit. The electric energy output efficiency of the piezoelectric plate can be remarkably improved, and the dual functions of sound absorption and energy recovery are achieved.

This invention discloses a clutter suppression method and system for a dual-base-end array airborne radar, relating to the field of airborne radar technology. The method includes the following steps: acquiring attitude angles, position coordinates, and velocity vector data of the transmitting and receiving ends; reconstructing the geometric baseline between the two ends under a unified reference frame; performing spatiotemporal joint analysis on the echo signal under geometric baseline constraints to generate a clutter spectrum; constructing a spatiotemporal filtering weight vector based on the angle and frequency distribution characteristics of the clutter spectrum; applying local sparse constraints to suppress noise energy in conjunction with the filtered output; and performing multi-channel coherent superposition of the processing results to achieve signal energy aggregation. This invention, through geometric baseline constraints under a unified reference frame and clutter spectrum construction, enables the spatiotemporal filtering direction to adaptively match the clutter structure, improving clutter suppression stability under asymmetric configurations; and by combining local sparse constraints and multi-channel coherent energy aggregation, it enhances target echo prominence and improves the detection capability of weak targets in complex clutter environments.

The application relates to the field of noise elimination technology and discloses a noise elimination structure and a working method thereof. The noise elimination structure comprises a bottom plate, a noise elimination hole plate which is arranged in a first direction and forms a sandwich space, a stand column which is arranged between the noise elimination hole plate and the bottom plate, one end of the stand column being connected with the bottom plate and the other end being connected with the noise elimination hole plate, noise elimination wires which are made of elastic materials, one end of the noise elimination wires being fixedly connected with the stand column and the other end being arranged in a suspended mode in the sandwich space, and a plurality of noise elimination wires which are arranged on the outer side wall of the stand column in a circumferential direction. The noise elimination wires are suitable for being deformed under the action of the sound pressure of noise to convert noise energy into vibration mechanical energy. The noise elimination structure has the advantages of energy absorption and conversion in a full-frequency range of noise and can adapt to a multi-frequency complex noise source by arranging the noise elimination wires on the stand column and converting noise energy entering the inside of the noise elimination structure into mechanical energy through mechanical vibration deformation of the noise elimination wires.

The application relates to the technical field of data reasoning, and discloses a spring fatigue crack initiation early warning method and system based on acoustic emission, which comprises the following steps: extracting a background noise section of an original acoustic emission signal stream in a spring fatigue test process; adaptively generating a dynamic noise threshold according to noise energy distribution in the background noise section; synchronously inputting acoustic emission event signals exceeding the dynamic noise threshold in the original acoustic emission signal stream into a time domain analysis channel and a frequency domain analysis channel; extracting a time domain feature vector of the acoustic emission event signals and extracting a frequency domain feature vector of the acoustic emission event signals; fusing the time domain feature vector and the frequency domain feature vector to obtain a crack sensitive parameter of the spring fatigue; judging a crack initiation probability value of a target spring according to the crack sensitive parameter; obtaining a crack initiation early warning instruction of the target spring when the crack initiation probability value continuously exceeds a fatigue probability threshold value; and the application can improve the accuracy of spring fatigue prediction.

The utility model discloses a gas purging mechanism with a noise reduction function, which comprises a gas supply device, one end of the gas supply device is connected with a purging device, and the other end of the gas supply device is connected with a gas supply device; the noise reduction device is arranged on the blowing device, the noise reduction device comprises an elastic buffer layer, a sound absorption unit, a noise reduction unit and a sound insulation unit, the elastic buffer layer and the sound absorption unit are arranged on the inner side of the blowing device, and the noise reduction unit and the sound insulation unit are arranged on the outer side of the blowing device; and the control device is arranged on the air supply device and is electrically connected with the air supply device and the air supply device. The elastic buffer layer can buffer vibration noise generated by gas impact, the sound absorption unit can absorb part of noise energy, the silencing unit can further eliminate noise of specific frequency, the sound insulation unit can prevent the noise from spreading outwards, and an effective noise reduction barrier is formed.

The invention discloses an air conditioner outdoor unit acoustic metamaterial structure, an air conditioner and a control method.The air conditioner outdoor unit acoustic metamaterial structure is characterized in that a flow guide ring is arranged on an air conditioner outdoor unit, the acoustic metamaterial structure comprises a silencing unit and a gas injection device, and the silencing unit is arranged on the flow guide ring; the silencing unit comprises a shell and an acoustic film structure, the shell is provided with a first through hole, a silencing cavity and a second through hole which are communicated in sequence, the acoustic film structure is arranged on the first through hole, the gas injection device is communicated with the second through hole so as to inject gas into the silencing cavity, and the first through hole and the second through hole are communicated with each other. The housing is recessed into the silencing cavity to form at least one resonator structure. The acoustic metamaterial of the fan is combined with the flow guide ring, the pneumatic noise of the fan can be effectively reduced without changing the air volume of the fan, and meanwhile, the discrete noise energy is effectively consumed and the noise reduction effect is improved by arranging the gas injection device and the resonator structure.

This invention discloses a sound insulation device for an automatic aging chamber, relating to the technical field of sound insulation devices. The device includes a chamber with an inlet, an outlet, and an observation window. Sound insulation components include a sound insulation curtain, a transparent sound insulation panel, sound insulation cotton, and a sealing strip. The sound insulation curtain is located at the inlet and outlet, the transparent sound insulation panel is located at the observation window, and sound insulation cotton is installed on the inner wall of the chamber, excluding the observation window. Sealing strips are installed in the gaps within the chamber. The sound insulation curtains at the inlet and outlet form a dynamic sound barrier during product loading and unloading, effectively blocking noise leakage. The observation window reduces sound wave transmission while allowing operators to observe the testing process. The sound insulation cotton on the inner wall of the chamber absorbs and attenuates noise, further reducing noise energy. The sealing strip eliminates structural sound leakage channels, achieving a fully enclosed sound insulation seal, thus achieving efficient noise reduction throughout the entire aging test of audio products and reducing the noise intensity around the aging chamber.

The utility model discloses a kind of earphone wind noise elimination structures based on stepped inner retraction cavity, the earphone wind noise elimination structure includes first sound inlet net, shell, sound guide cover and the PCBA component integrated with microphone;The shell has stepped inner retraction cavity, the first sound inlet net is located in the top opening of the stepped inner retraction cavity, the bottom of the stepped inner retraction cavity is equipped with sound inlet, the axial section of the stepped inner retraction cavity is trapezoidal configuration, and noise energy dissipation is realized by setting 20-60 ° sound wave incidence angle, and the cavity has linear flow channel to keep the axial coherence of airflow path.The utility model is through the trapezoidal section design (20-60 ° sound wave incidence angle) of stepped inner retraction cavity, realizes the directional dissipation of noise energy, under the premise of guaranteeing wind noise elimination, simultaneously solve the airflow resistance of traditional maze channel, the problem of complex sound path, and significantly improve yield and production efficiency by means of injection molding integrated.

This invention relates to the field of noise detection technology and discloses a method and system for locating and detecting noise sources across the entire chain of a fixed-load insulated fan. The method includes: deploying a multi-parameter intelligent synchronous sensing system for flow, sound, and vibration to acquire cross-sectional average instantaneous wind speed, multi-channel noise, and multi-axis vibration signals; generating a whole-machine noise flow-order spectrum through flow phase resampling and constructing a component-level spectral fingerprint database; then performing cross-stage spectral fingerprint matching and completing sound-vibration cross-verification classification by combining multi-axis vibration signals; finally constructing a micro-speed spectrum family to decompose the overlapping flow-order frequency bands into multiple powers and separate the aerodynamic-mechanical energy of the mixed peaks to be decomposed, obtaining source-by-source energy allocation results and a quantitative table of the contribution rate of the whole-chain noise sources; this invention eliminates the broadening and distortion of spectral characteristic peaks caused by airflow fluctuations, and achieves compatible matching of whole-machine and component-level spectral fingerprints as well as the quantitative decomposition and allocation of mixed overlapping noise energy.

The invention discloses a low-noise ventilator with a wave-shaped noise elimination structure, belongs to the technical field of ventilation equipment, and aims to solve the problem that the aerodynamic noise and the eddy noise are relatively large when the existing ventilation equipment runs. The ventilator comprises a current collector, a rectification streamline cover, a first-stage explosion-proof motor, a second-stage explosion-proof motor, a first-stage main cylinder, a second-stage main cylinder, a first-stage impeller, a second-stage impeller, an outlet streamline body and a wave-shaped surface structure silencer. The rectification streamline cover and the outlet streamline body are matched to form a smooth flow channel in the ventilator, airflow can be effectively guided to flow stably, airflow collision and vortex generation are reduced, and therefore aerodynamic noise and vortex noise are reduced. The silencer with the wave-shaped surface structure is arranged in a flow channel of the ventilator, the perforated silencing plate is arranged on the surface of the silencer and is wave-shaped, noise energy is obviously absorbed by increasing the sound absorption area and the sound wave reflection path, and the overall noise of the ventilator is further reduced.