22 results about "Infrasound waves" patented technology

The invention discloses a hearth flue gas velocity field measurement method and system based on a multi-layer sonic sensor, and the method comprises the steps: obtaining the sound wave propagation time when a sound wave reaches other sonic sensors after the sound wave is transmitted each time according to the multi-layer sonic sensor; different two-dimensional plane temperature fields are formed based on sound wave propagation time obtained by the same-layer sound wave sensors; according to different two-dimensional plane temperature fields, performing estimation by combining a correlation analysis method and a linear interpolation method to obtain three-dimensional hearth temperature field distribution; constructing a solving equation based on the three-dimensional hearth temperature field distribution, the acoustic wave propagation time and propagation path from the lower acoustic wave sensor to the upper acoustic wave sensor, and a preset flue gas velocity field; and solving the solving equation, outputting unknown parameters in the flue gas velocity field, and reconstructing full-field velocity distribution according to a preset flue gas velocity field formula. According to the method, no hardware cost is increased, the velocity field in the vertical direction of the hearth smoke is accurately measured, and key data support is provided for combustion optimization and intelligent monitoring of a power plant.

Seating including a sound cancellation system is described. An example vehicle bench seat has a first backrest, a first loudspeaker, a second backrest, a second loudspeaker, a center portion, and a seat base. The first loudspeaker is disposed within the first backrest, and the second loudspeaker is disposed within the second backrest. Each of the first loudspeaker and the second loudspeaker emits primary sound waves and secondary sound waves. The secondary sound waves of the first loudspeaker are 180 degrees out of phase with the primary sound waves of the first loudspeaker, and the secondary sound waves of the second loudspeaker are 180 degrees out of phase with the primary sound waves of the second loudspeaker. The center portion includes a channel that directs the secondary sound waves emitted by the first loudspeaker and the second loudspeaker into a vehicle cabin to cancel unwanted primary sound waves.

This invention discloses an infrasound localization method for minor pipeline leaks, comprising: acquiring the original infrasound signal of the pipeline leak; performing variational mode decomposition on the original infrasound signal to obtain IMF components; based on the IMF components, using an improved generalized cross-correlation function to obtain the time difference between the infrasound reflection to the upstream and downstream ends of the pipeline; calculating the wave velocity of the infrasound according to the pipeline characteristics; and determining the location of the pipeline leak point based on the time difference and wave velocity. The improved generalized cross-correlation function method involves: constructing an analytical signal based on the IMF components; using an improved linear adaptive weighted local approximation algorithm to obtain the local optimal solution of the IMF components; and performing inverse attenuation dispersion compensation analysis based on the generalized cross-correlation function to obtain the time difference between the infrasound reflection to the upstream and downstream ends of the pipeline. This invention can accurately locate the pipeline leak point.

This application provides a portable oil and gas well fluid level monitoring system and method, relating to the field of underground wellbore fluid level monitoring technology. The system includes: a virtual instrument platform configured with a LabVIEW-based program for casing pressure signal acquisition and control, a sound-generating device control program, and a sound wave signal acquisition program; a portable acquisition instrument including: a USB data acquisition card, a pressure transmitter, a sound-generating module, and a microphone; the pressure transmitter acquires pressure information at the inlet of a normally closed solenoid valve within the sound-generating module; when the pressure information reaches a preset pressure, a pressure ready signal is generated; when the pressure ready signal is valid, the sound-generating module is controlled to generate infrasound; and the infrasound reflection signal received by the microphone is acquired, processed by a MATLAB-based signal processing program, and displayed in the user interface of the sound wave signal acquisition program. The implementation method provided in this application is beneficial for improving the efficiency and safety of oil well production.

This invention relates to the field of underwater acoustic equipment technology, and discloses an aerodynamic source for underwater infrasound generation. It includes multiple aerodynamic source units, some of which are main aerodynamic sources, and the remainder are auxiliary aerodynamic sources. The number of auxiliary aerodynamic sources is no less than that of the main aerodynamic sources. An array of auxiliary aerodynamic sources corresponding to each main aerodynamic source is distributed around the main aerodynamic source. The emission ports of the multiple aerodynamic source units all face the same direction. Each aerodynamic source unit includes a unidirectionally connected operating chamber and a emission chamber. The air inlet of the operating chamber is connected to an external air source to introduce inert gas into the operating chamber. The emission port is located at the end of the emission chamber furthest from the operating chamber. This invention allows for individual adjustment of the emission time of each emission chamber, broadening the infrasound frequency range and increasing the infrasound intensity, enabling the generation of broadband infrasound signals with an intensity exceeding 200 dB in underwater environments.

The application provides a submarine cable routing and fault point positioning method. Sound waves emitted by two sound sources with known coordinates are received by a sound wave receiving device of the submarine cable. After receiving the sound waves twice continuously, the time difference between the two times when the sound wave receiving device receives the sound waves emitted by the two sound sources twice is obtained, the submarine cable routing is positioned, the fault point is pre-positioned by using a distributed optical fiber sound wave sensing technology, the relative position relationship between the two sound sources and the fault point is obtained based on the sound wave receiving device, the smaller the time difference between the times when the sound wave receiving device receives the sound signals emitted by the two sound sources and the fault point is, the closer the distance between the two sound sources and the fault point is, the two sound sources are moved along the submarine cable routing direction to the fault point until the time difference is smaller than a given value, and the coordinate of the submarine cable routing at this time is taken as the coordinate of the fault point.

The invention discloses an infrasonic wave monitoring method and device, electronic equipment and a storage medium. The method comprises the following steps: determining first waveform data; the first waveform data is used for describing data acquired in real time and related to a first sound monitoring array; determining configuration parameters based on the first waveform data; the configuration parameters are parameter information used by a preset algorithm associated with the first sound monitoring array; the preset algorithm is configured in the event processing task to process the waveform data; determining an event processing task of the first sound monitoring array based on the configuration parameters; processing second waveform data according to the event processing task of the first sound monitoring array to obtain a detection result; the second waveform data comprises the first waveform data and / or waveform data of the first sound monitoring array except the first waveform data. According to the technical scheme, the problems that the use efficiency of computing resources for infrasonic wave monitoring is low, the compatibility of a PMCC detection algorithm is poor, and the real-time computing efficiency is low are solved.

The invention relates to an integrated composite detector based on infrasound audio vibration. A collection detector integrating three sensors is composed of an infrasound sensor, a vibration sensor, a microphone and a collection control calculation circuit board. A Beidou antenna, a 4G antenna and an LR-WIFI antenna are installed in the detector head, head solar energy serving as an auxiliary power supply is installed on the surface of the head of the detector head, and external solar energy serving as a main power supply is installed outside the detector head. The detector head is installed on the ground nail barrel, the battery pack is installed in the ground nail barrel, and the ground nail head is connected below the ground nail barrel. A vibration sensor is installed in a ground nail head, a sound guide pipe is installed outside a detector head, a microphone is connected with the sound guide pipe, and sound waves enter the microphone from the sound guide pipe. According to the invention, good detection of homologous infrasonic waves, audio sound waves and vibration is realized.

The application relates to the technical field of sewer pipeline detection, and discloses a sewer pipeline structural defect detection system, method, medium and product. The controller actively constructs and generates coded infrasound wave signals, so that the signals have stable frequency and amplitude characteristics. An infrasound sounding module uses the coded infrasound wave signals to emit and process infrasound waves, and makes low-frequency mechanical vibration signals stably propagate along the pipe wall, reduces energy attenuation, and covers long-distance pipe sections that cannot be reached by traditional passive detection. The low-frequency mechanical vibration signals are detected by an infrasound signal receiving module, and analog signals are converted into initial digital signals, so that interference and distortion in the transmission process are reduced. Further, by combining a Fourier transform method and a correlation coefficient analysis method, the problem of high misjudgment rate of a traditional single algorithm is avoided, the accurate identification of pipeline structural defects is ensured, and the accuracy requirement of sewer pipeline structural defect detection under complex working conditions is met.

Provided is a dehydrogenation method capable of efficiently reducing hydrogen content in steel for thick or complexly-shaped steel materials and steel products in general. In a dehydrogenation method for a steel material, in a series of steel material production process including: a process of supplying a steel raw material; a process of subjecting the steel raw material to hot working; a process of inspecting a steel material obtained from the steel raw material; and a process of shipping the steel material, at least one of the steel raw material and the steel material at any stage from the supply process to the shipment process is subjected to, at least once, a sound wave irradiation treatment so that a sound pressure level at a surface of the at least one of the steel raw material and the steel material will be 30 dB or more.

The application relates to the technical field of drainage management, and discloses a mixed wrong connection drainage pipe network checking system, method and device.The mixed wrong connection drainage pipe network checking system comprises a infrasound fingerprint sound generator, an infrasound fingerprint receiver and a data background which are sequentially wirelessly connected.The infrasound fingerprint sound generator is arranged at the pipe opening of a target drainage pipe, and the infrasound fingerprint receiver is arranged in the drainage pipe opening in a target diagnosis area.The infrasound fingerprint sound generator encodes infrasound fingerprints to obtain coded infrasound signals, and sends the coded infrasound signals into the target drainage pipe.The infrasound fingerprint receiver collects infrasound fingerprint signals of the drainage pipe opening in the target diagnosis area.The data background carries out pipe connection detection and mixed wrong connection point determination based on the coded infrasound signals and the infrasound fingerprint signals, and obtains a mixed wrong connection drainage pipe network checking result.The application guarantees the accuracy of the mixed wrong connection drainage pipe network checking result, and improves the checking efficiency.

The application discloses a dummy system and method for detecting the injury effect of infrasound waves on human bodies, and relates to the technical field of dummy systems. The dummy system comprises a dummy body and an infrasound wave detection, collection and processing device. The dummy body comprises a head, a neck, a trunk, an artificial heart and an artificial lung. The artificial heart and the artificial lung are arranged in the trunk. The head, the trunk, the artificial heart and the artificial lung are made of acoustic metamaterials. The infrasound wave detection, collection and processing device comprises acceleration sensors and a data acquisition module arranged in the dummy body respectively, infrasound wave frequency test sensors and infrasound wave sound pressure intensity test sensors arranged in the environment where the dummy body is located respectively, and an upper computer. The data acquisition module is electrically connected with the acceleration sensors. The upper computer is electrically connected with the data acquisition module, the infrasound wave frequency test sensors and the infrasound wave sound pressure intensity test sensors respectively. The dummy system can simulate the resonance and damage state of the human body under the influence of infrasound waves.

An audio signal processing method and device, an earphone and a storage medium, the method being applied to the earphone, the method comprising: outputting a test audio signal through a loudspeaker, the test audio signal being obtained by mixing a basic audio signal and an infrasonic wave signal; collecting a receiving audio signal corresponding to the test audio signal through a feedback microphone; a first equalization parameter corresponding to the basic audio signal and a second equalization parameter corresponding to the infrasonic wave signal are determined according to the received audio signal, the first equalization parameter is used for performing ear shape adaptive equalization matched with the ear shape of a user on a to-be-output target audio signal, and the second equalization parameter is used for performing adaptive equalization on the to-be-output target audio signal; the second equalization parameter is used for carrying out wearing leakage adaptive equalization matched with the earphone wearing state on the target audio signal. According to the embodiment of the invention, the earphone can provide personalized ear shape adaptive equalization and wearing leakage adaptive equalization for different users, thereby facilitating the improvement of the effectiveness of the earphone in performing active noise reduction on the audio signal.

The invention relates to the technical field of marine disaster early warning, and discloses a typhoon path inversion method and system based on marine background noise spectrum features, and the method comprises the steps: S1, constructing an LSTM-Attention feature fusion model; s2, noise data and meteorological data of at least three nodes are collected once every five minutes; the noise data comprises 8-20Hz infrasonic wave signals, and the meteorological data comprises air pressure data, wind speed data and temperature data; s3, screening the noise data to obtain an effective infrasonic wave signal; and S4, performing spectrum analysis and feature extraction on the effective infrasonic wave signals to obtain infrasonic wave features and the like. According to the method and system, a physical coupling mechanism of'typhoon infrasonic wave-barometric gradient-sea surface wind field 'is established through coupling modeling of ocean background noise infrasonic wave features (8-20 Hz) and meteorological parameters, and typhoon path deviation is pre-warned 6-12 hours in advance.

The application discloses a kind of mud-rock flow monitoring positioning early warning systems based on infrasound wave, comprising the following steps: step S1: for the mud-rock flow prone area of complex mountainous area in construction period, infrasound sensor array is laid out;Step S2: by real-time acquisition infrasound signal, by 4G or Beidou wireless communication technology data transmission to data processing center;Step S3: the infrasound signal of acquisition is carried out data processing and analysis identification;Step S4: based on comprehensive consideration infrasound signal energy attenuation model and sound reach time difference (TDOA) algorithm, the energy attenuation data of multiple sensors received to infrasound signal and time difference calculate the position of mud-rock flow infrasound wave source;Step S5: system according to monitoring result and set threshold, automatically trigger early warning mechanism, to public warning;Step S6: by visual monitoring platform, real-time display mud-rock flow infrasound signal waveform, mud-rock flow position and early warning state.

The utility model discloses a microphone housing and a bottom structure, the microphone housing comprises an upper cover and a lower cover provided with a gap, the lower cover is fixedly installed on the upper cover, the upper cover is provided with an upper cavity, the lower cover is provided with a lower cavity, and when the lower cover is fixedly installed on the upper cover, the upper cavity and the lower cavity form an accommodating cavity. The upper cover is provided with at least one fan-shaped hole, and the upper cover is provided with a light guide hole. The damping silica gel sleeve and the flexible body can absorb and reduce resonance generated by mechanical vibration, noise is reduced from the source, sound waves pass through the fan-shaped holes and the silencing holes in sequence in the transmission process, so that the sound waves rub with media and are treated for multiple times, the amplitude of the sound waves is effectively reduced, the maximum noise reduction effect is achieved, and the noise reduction effect is improved. And the influence caused by noise is greatly reduced, so that a sound absorption and micropore noise reduction system is established, and the sound insulation effect of the microphone is ensured.

The application relates to the technical field of marine disaster early warning, and discloses a typhoon path inversion method and system based on marine background noise spectrum characteristics, which comprises the following steps: S1, constructing an LSTM-Attention feature fusion model; S2, collecting noise data and meteorological data of at least three nodes, once every 5 minutes; the noise data comprises 8-20 Hz infrasound wave signals, and the meteorological data comprises air pressure data, wind speed data and temperature data; S3, performing screening processing on the noise data to obtain effective infrasound wave signals; and S4, performing spectrum analysis and feature extraction on the effective infrasound wave signals to obtain infrasound wave features and the like; the method and system are coupled with meteorological parameters through marine background noise infrasound wave features (8-20 Hz) to model, a physical coupling mechanism of a 'typhoon infrasound wave-air pressure gradient-sea surface wind field' is established, and typhoon path deviation can be early warned for 6-12 hours.

A system is provided for detecting an anomaly in a monitored device having one or more internal components that are mechanically displaced during operation of the monitored device which produces pressure variations internal to the monitored device. For example, a system comprises a passive infrasound sensor mounted to an exterior wall of the monitored device to detect infrasound produced by the pressure variations and a monitoring device comprising a controller. The controller is configured to receive data from the passive infrasound sensor corresponding to the detected infrasound, compare the data received from the passive infrasound sensor to a plurality of infrasound reference signals to determine if the detected infrasound is indicative of an anomaly in at least one of the one or more internal components.

The application discloses a resonant cavity pressure feedback control method for infrasound wave generation and relates to the technical field of industrial control. The resonant cavity pressure feedback control method for infrasound wave generation comprises the following steps: S1, obtaining pre-wave cavity pressure observation data and performing time axis repositioning and period scale unification; S2, calculating a peak value phase difference, and evaluating pre-wave pressure window adaptation; S3, evaluating cavity pressure loss sequence deviation, and performing cavity pressure loss state feature matching; and S4, constructing a control direction matrix, writing a closed-loop control vector into a controller, and generating a lock identification. The application effectively improves the stability of resonant cavity pressure concentration, pressure relief control and frequency lowering in the infrasound wave generation process, and solves the problem that existing infrasound wave generating equipment can only rely on driving frequency or driving power adjustment, and it is difficult to determine whether an effective pressure window is formed in front of a quarter wavelength in the cavity.

This invention relates to the field of sound monitoring technology, specifically to a wildlife sound detection system, method, and device based on voiceprint recognition. The system includes: a multimodal sound acquisition module, a voiceprint feature extraction engine, an acoustic fingerprint database, a species identification decision module, and an ecological behavior analysis unit. The multimodal sound acquisition module integrates an array microphone and an infrasound sensor, supporting full-band environmental acoustic signal acquisition. The voiceprint feature extraction engine uses an adaptive frequency band segmentation algorithm to extract animal voiceprint biometrics. The acoustic fingerprint database stores acoustic feature templates for multiple species and environmental noise samples. The species identification decision module constructs a voiceprint classification model based on a deep residual network. The ecological behavior analysis unit generates wildlife activity pattern reports through a spatiotemporal distribution map of acoustic events. This solves the problems of severe environmental noise interference, low individual feature differentiation, and difficulty in identifying species with small samples in existing technologies.

Disclosed in the present invention are methods and a system for sending and receiving a low-frequency sound signal. The sending method comprises: converting, according to a preset vibrating diaphragm, a sound signal emitted by a device awaiting detection into a micro-vibration signal; superimposing a preset infrasonic signal onto the micro-vibration signal to obtain a mixed signal; and optimizing and sending the mixed signal according to the current ambient noise condition. The receiving method comprises: adjusting a signal receiving parameter according to the current ambient noise condition; capturing the mixed signal within a preset detection range according to the signal receiving parameter; and restoring, from the mixed signal, the sound signal emitted by the device awaiting detection. In the present application, a low-frequency sound signal emitted by a device is converted into a micro-vibration signal by means of a special vibrating diaphragm, thereby achieving stable transmission of the low-frequency sound signal.

The sound wave sound production system comprises an air compressor, a whistle sound production assembly and a sound wave reflection assembly, air flow generated by the air compressor passes through the whistle sound production assembly to form sound waves, the whistle sound production assembly comprises an inlet pipe, a vortex generation part, a resonant cavity and a diffusion pipe, and the flow speed of the air flow is increased after the air flow passes through the inlet pipe; high-speed airflow generates rotating vortex after passing through the vortex generating part, the vortex resonates through the resonant cavity to form sound waves, and each part of the whistle generating assembly is only of a mechanical structure, so that an additional matching circuit is not needed in the sound wave forming process, more stable sound waves can be formed, and the stability of the sound wave sounding system is improved; secondly, after the sound waves are diffused through the diffusion pipe, the sound wave sounding intensity is improved, then the sound waves are projected to the sound wave reflection assembly, the sound wave reflection assembly reflects the sound waves, the density and intensity of the sound waves are further improved, and therefore efficient and stable work of the sound wave sounding system is achieved.