421 results about "Frequency sound" patented technology

The invention discloses a frequency mixing sound demodulator based on a curled structure and a use method thereof in the acoustics field, the demodulator is used for separating frequency mixing sound mixed by a plurality of sound waves with preset frequencies according to respective frequencies, and the demodulator comprises an air waveguide for transmitting the sound waves, and blocking structures arranged on two sides of the air waveguide for blocking the sound waves from penetrating, and a plurality of curled structures that capture corresponding preset frequency sound waves; curled structures are arranged in the barrier structure on at least one side of the air waveguide at intervals, one end of each curled structure is open, and the other side is closed; a plurality of cross beams for blocking penetration of sound waves are arranged in each curled structure, and an internal channel of each curled structure is divided into different lengths to serve as different acoustic resonant cavities so as to capture the sound waves with different frequencies; the closed end of each curled structure is a detection end of each preset frequency sound wave. The invention solves the problem that the existing method is difficult to instantly separate the frequency mixing sound signal and carry out information transmission.

The invention discloses a leakage monitoring method of a sealing connection structure for hydrogen conveying, and relates to the field of gas conveying and storage monitoring, and the method comprises the steps: S1, arranging an annular negative pressure sampling cavity to collect multi-modal data, and calculating the angle section suspiciousness; s2, applying thermal pulse and sweep frequency sound wave excitation, and collecting a response signal to generate a thermoacoustic leakage score; s3, environment compensation and multi-sensor fusion are carried out to obtain an angle section hydrogen concentration time sequence; s4, obtaining an inversion flux based on the comprehensive response and sparse-smooth inversion to realize leakage positioning; and S5, calculating a risk score and performing graded alarming according to a threshold value. Multi-point detection units are arranged in the circumferential direction of the sealing connection structure, signal fusion is adopted, full-coverage leakage monitoring and high-precision positioning of the sealing structure are achieved, emergency measures are automatically triggered in combination with risk grading, and the discovery timeliness and safety are improved.

The invention discloses a multi-channel audio calibration method, system and device and a storage medium, and relates to the technical field of audio, and the method comprises the steps: collecting and separating a main sound channel signal and a bass sound channel signal in a multi-channel audio signal; detecting time delay between a main sound channel and a bass sound channel based on a phase correlation algorithm, and performing adaptive delay compensation; the state change of the audio signal is monitored in real time, and before or when a signal switching event is detected, gradient gain envelope is applied to the bass sound channel signal, so that the signal amplitude gradually changes to a target value according to a preset nonlinear curve; a sonic boom event is analyzed and identified based on multi-dimensional characteristics, a self-adaptive amplitude limiter with a prospective processing capability is started for suppression, and harmonic distortion compensation and phase correction are carried out on a processed signal, so that the problems of signal asynchronization caused by low-frequency output delay of an audio system in the prior art, and the system reliability is improved are solved. Therefore, the low-frequency sound quality and the system stability are improved.

The invention discloses a method for realizing ocean sound field prediction based on a pre-training optimized physical information neural network, which comprises the following steps of: pre-training: constructing a hypothetical ocean environment, generating simulation data in a sound pressure envelope form by using an acoustic numerical calculation tool, and pre-training the physical information neural network to learn a physical rule of sound field propagation; fine tuning: adjusting an energy scale factor according to the proportion of the sound pressure amplitude of the actual measurement point to the sound pressure amplitude of the pre-trained environment, and performing fine tuning by using the envelope amplitude data of the actual measurement sound field for the pre-trained physical information neural network to obtain an ocean sound field prediction model through a pre-training-fine tuning dual-stage strategy; and ocean sound field prediction: according to the ocean sound field prediction model, obtaining a target position envelope from the to-be-predicted range, and then converting the target position envelope into a sound pressure result to realize ocean sound field prediction. The method can improve the high-frequency sound field modeling precision and training efficiency, and can be widely applied to the fields of ocean sound field modeling, sound source localization and environment inversion.

The invention provides a big data-based material detection method and system, relates to the field of material quality detection, and solves the technical problems of insufficient detection precision and poor supply chain quality control linkage in an existing material detection method. The method comprises the following steps: transmitting sweep-frequency sound waves to warehouse-in materials of a peripheral warehouse by using a sound wave transmitting device; collecting vibration velocity spectrum data and sound pressure gradient data of the warehouse-in material after the warehouse-in material receives the frequency sweep sound wave; according to the vibration velocity spectrum data and the sound pressure gradient data, calculating a defect index of the warehouse-in material; and when the defect index is greater than a preset threshold value, marking the warehousing material as a defective material, sending a traceability detection instruction to a previous node warehouse, and starting a grading detection process of the previous node warehouse. The method and the device are used for warehousing detection, quality traceability and full-chain management and control processes of the materials in the supply chain.

The invention belongs to the technical field of low-frequency sound absorption, and discloses a micro-perforated plate composite gradient spiral pipe sound absorption device and method.The micro-perforated plate composite gradient spiral pipe sound absorption device comprises a variable cross-section spiral pipe, and the diameter of the inlet end of the variable cross-section spiral pipe is larger than that of the outlet end of the variable cross-section spiral pipe; a plurality of MPP plates are mounted in the variable-cross-section spiral pipe, one MPP plate is embedded into the inlet end of the variable-cross-section spiral pipe, and the other MPP plates are sequentially embedded into the variable-cross-section spiral pipe at equal intervals, so that a multi-stage MPP plate composite sound absorption structure is formed; and the cross-section pipe diameter of the variable cross-section spiral pipe is linearly reduced from the inlet end of the variable cross-section spiral pipe to the outlet end of the variable cross-section spiral pipe. Through the gradient design of the variable cross-section spiral tube integrated micro-perforated plate, low-frequency broadband efficient sound absorption is realized in a compact space, the problem of heavy structure caused by dependence on a deep and large back cavity in the traditional technology is avoided, the limitation of narrow sound absorption frequency band is overcome, and the sound absorption device is particularly suitable for being applied to occasions with limited spaces and has wide application prospects. And low-frequency performance and broadband characteristics are considered in a limited space.

The invention discloses a low-frequency sound propagation loss forecasting method suitable for a polar region sea area, and the method comprises the steps: building a two-dimensional ice layer model of a forecast sea area according to remote sensing data based on the setting that sea ice of the polar region sea area is a uniform elastic medium; calculating hydrological conditions of the ocean sound channel of the polar sea area; establishing a forecast sea area two-dimensional seabed model according to the seabed topography sediment database; an under-ice sound field model is constructed based on a three-dimensional cylindrical coordinate system, sound pressure from unit intensity sound sources with different sizes and depths to a receiving point in a forecast sea area is calculated through a frequency domain finite element method in combination with a PML technology, and sound propagation loss of a needed position is obtained through calculation. According to the method, the application limitation of traditional ray and normal wave theories under complex boundary conditions is broken through through a finite element method, a synergistic effect mechanism of actual ice layer parameter space change, submarine topography fluctuation and sound velocity profile gradient characteristics is systematically analyzed, and sound field modeling is more accurately carried out on different ice layers and submarine topographies in the Chukong sea region all year round; the influence of sound wave propagation is simulated.

The invention relates to the technical field of sound absorption composite materials, in particular to a porous composite material capable of enhancing sound absorption performance and a preparation method and application of the porous composite material capable of enhancing the sound absorption performance. And high-efficiency sound absorption can be realized in the full frequency band of 100Hz-6000Hz. Especially in the low-frequency band of 200Hz-1000Hz, the sound absorption coefficient is increased by 20%-50% compared with that of a traditional porous material with similar thickness and weight, and the problem that the traditional material is insufficient in low-frequency sound absorption is solved.

The invention relates to the technical field of material performance detection, and discloses a non-destructive evaluation method and system for the strength of microorganism mineralized river sand, and the method comprises the following steps: applying a sweep frequency sound wave excitation signal to a microorganism mineralized river sand standard sample model; performing penetration simulation operation on the microorganism mineralized river sand standard sample model according to the sweep frequency sound wave excitation signal; extracting mineralization specific characteristic parameters corresponding to the sample model through the penetration response signal; according to the mineralization specificity characteristic parameters, constructing a biological cementation index of microorganism mineralization, and according to the biological cementation index, analyzing the compressive strength of the microorganism mineralization river sand standard sample model; constructing a destructive calibration curve of the microorganism mineralized river sand standard sample model; the target compressive strength of the to-be-tested sample model is analyzed through the destructive calibration curve, and the strength non-destructiveness of the microorganism river sand corresponding to the to-be-tested sample model is analyzed based on the target compressive strength. According to the method, the accuracy of non-destructive evaluation of the strength of the microorganism mineralized river sand can be improved.

The invention provides a far-field sound source localization method applied to a transformer substation, and relates to the field of sound source localization, and the method comprises the steps: obtaining a target frequency sound in the transformer substation, and converting the target frequency sound into a spherical harmonic domain multi-channel observation vector; inputting the spherical harmonic domain multichannel observation vector into a preset network model to obtain a spherical harmonic domain mask matrix, and obtaining an in-band smooth covariance based on the spherical harmonic domain mask matrix; the preset network model is used for filtering the spherical harmonic domain multi-channel observation vector; according to the in-band smooth covariance, a spatial spectrum matrix is obtained, and the spatial spectrum matrix comprises spatial spectrum values in different candidate sound source directions; performing multi-sound source distinguishing on the spatial spectrum matrix to obtain a multi-source direction set, and realizing far-field sound source positioning of the transformer substation; the multi-source direction set comprises polar angle and azimuth angle coordinates of each target sound source direction and is used for reflecting the sound source direction in the transformer substation. The method solves the problems that the noise interference of the transformer substation is large and multiple sound sources are difficult to distinguish, and realizes the accurate positioning of the sound sources in the transformer substation.

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 ocean engineering, in particular to a wind power single pile local scouring real-time detection method based on multi-frequency acoustic tomography, which comprises the following steps: S1, annularly arranging an acoustic sensor array on the section above the water surface of a pile body; s2, transmitting multi-frequency sound wave signals including low-frequency penetrating waves and high-frequency surface waves; s3, scattered wave signals reflected by the pile-seabed interface are collected, and low-frequency scattered waves and high-frequency scattered waves corresponding to the frequency in S2 are separated; s4, constructing a mud layer penetration acoustic tomography matrix and a surface topography acoustic tomography matrix; s5, three-dimensional data fusion is carried out, and a three-dimensional image of the scouring state of the seabed around the pile is generated; and S6, a scouring pit is positioned according to a sound wave propagation time delay sudden change area in the three-dimensional image of the scouring state. According to the method, the scouring state of the seabed around the wind power single pile foundation can be accurately monitored by combining the multi-frequency acoustic tomography technology and time delay abrupt change area detection.

The invention discloses a fish repelling method and system based on multi-frequency sound wave cooperation and dynamic environment perception. The method comprises the steps that water area environment parameters are acquired, and the types and the density of fishes in the water area are recognized through sonar, water velocity and water quality parameters; matching an auditory sensitive frequency band set according to the fish species, and constructing a multi-frequency-band sound wave emission parameter set in combination with the water area environment parameters; according to the sound wave emission parameter set, the transducer array is controlled to emit a multi-band composite sound wave signal, and a sound field with a coverage angle of at least 180 degrees is formed; and monitoring the driving effect in real time, and dynamically adjusting the multi-band sound wave emission parameter set according to the density change of the fish school. According to the method, the fish repelling efficiency can be remarkably improved, the influence on non-target species is reduced, and an innovative solution is provided for ecological protection of water conservancy projects.

The invention provides a broken thick and large ore body continuous tunneling and filling mining method, and relates to the technical field of mining engineering.The method comprises the steps that the rock mass grade is determined through rock mass basic quality indexes, the single tunneling circulating footage and the top temporary supporting grade are matched, and in a set monitoring window, the current circulating section is subjected to continuous tunneling and filling mining; geological radar waves and short-range low-frequency sound waves are emitted to the top plate at equal time intervals, the proportion of high-frequency signals and the sound wave propagation speed are calculated, surrounding rock deformation section data, the change degree of two indexes and the DTW distance of continuous two-time radar wave reflection signals are comprehensively analyzed at each monitoring moment, and whether the surrounding rock deformation section data, the change degree of the two indexes and the DTW distance are abnormal or not is judged; if no abnormity exists, radar wave reflection signals are stored as standard templates according to the rock mass grade, and when the number of the standard templates is smaller than N, the data and a preset threshold value optimize the supporting grade; when the number of the templates is not smaller than N, the index mean value and the standard deviation update threshold value are counted according to monitoring moment grouping, and the top temporary support grade is optimized.

The invention discloses a coal bed gas exploitation and separation utilization method based on SCCO2 assistance, and belongs to the technical field of coal bed gas development. Supercritical carbon dioxide is prepared through a high-pressure reaction kettle and stored in a supercritical carbon dioxide storage and collection tank, meanwhile, nitrogen mixed with graphene is introduced, and CO2 / CH4 adsorption selectivity is enhanced by means of the characteristic that the specific surface area of graphene is large. A variable-frequency sound wave diffuser is matched to excite coal seam micro cracks through low-frequency sound waves, and supercritical carbon dioxide and nitrogen mixed gas is injected into a coal seam injection well. In the injection process, the sound wave diffuser synchronously radiates high-frequency sound waves to improve the displacement efficiency, then the gas enters the gas separation tower integrated with the molecular sieve membrane, and the produced gas is divided into upper methane, middle carbon dioxide and other bottom miscellaneous gas. Methane is pressurized by an air compressor and then stored in a methane storage tank, carbon dioxide is purified and pressurized and then recycled for coalbed methane exploitation, and offensive gas is cooled and stored after generating power by a steam turbine. And efficient mining, separation and multi-path utilization of the coal bed gas are realized.

The invention relates to a multi-physical mechanism synergistic light sound absorption and insulation integrated sandwich structure and a manufacturing method thereof.The multi-physical mechanism synergistic light sound absorption and insulation integrated sandwich structure comprises a panel, a sandwich layer and a micro-perforated panel which are arranged from top to bottom, a cavity is formed in the sandwich layer, and multiple sets of cantilever beam type harmonic oscillators arranged in an array are arranged in the cavity; the cantilever beam type harmonic oscillator comprises a cantilever beam base body and a metal rubber mass block fixed at the top end of the cantilever beam base body. According to the invention, through the coupling design of the micro-perforated plate and the internal grating cavity of the sandwich layer, the sound absorption frequency band is further widened, the sound absorption coefficient of the whole structure in a middle-high frequency band is improved, collaborative optimization of broadband sound absorption and low-frequency sound insulation is realized, the problem that a traditional harmonic oscillator is easy to lose efficacy in high-temperature and low-temperature environments is effectively solved, and the sound absorption efficiency is improved. And meanwhile, due to the design of the integrated sandwich structure, the problems of aging and layering of the adhesive layer in severe environments such as high temperature and damp and hot environments are avoided, and the integrity and durability of the structure are also remarkably improved.

The invention relates to the technical field of sound absorption, in particular to a bionic low-frequency sound absorption structure, a sound absorption device and a low-frequency noise control method.The bionic low-frequency sound absorption structure comprises a plurality of bionic resonance units, the bionic resonance units are hollow tubular bodies extending in the axial direction, and through holes are evenly formed in the tube walls in the axial direction and the circumferential direction; the plurality of bionic resonance units are arranged in parallel and tightly attached; structural parameters of the bionic resonance unit are bionic to measured data of a noctuid wing seta prototype structure, and are determined according to proportional amplification based on a structural vibration similarity principle. Decoupling of the structure scale and the sound wave wavelength is achieved through a bionic amplification strategy, and low-frequency sound waves can be effectively absorbed under the condition of small thickness; the dependence on a porous material is eliminated, and the problems that a fiber material is easy to age and poor in weather resistance are solved; the defects that a traditional resonance structure is narrow in frequency band and poor in adaptability are overcome, excellent broadband sound absorption characteristics and structural robustness are achieved, and effective control over low-frequency noise can be achieved.

The invention relates to the technical field of constructional engineering detection, in particular to a prefabricated industrial building outer wall joint leakage detection method and device, and the method comprises the steps: obtaining a multi-frame thermal infrared image and a reflection signal of a high-frequency sound wave before and after water spraying of a prefabricated industrial building outer wall; the seam leakage presentation degree of any position is determined; clustering the positions according to the seam leakage presentation degree and the coordinate position of any position to obtain a plurality of density clusters; according to the density cluster area of the leakage area in the thermal infrared image of each frame, the temperature mean value of the leakage area and the geometric center of the density cluster, the environment temperature and the environment humidity near the outer wall of the current frame and the height of the leakage area of the current frame in the outer wall, the final permeation strength of the leakage area in each frame is determined; and taking the geometric center of each leakage area in the initial frame as a leakage point location of the leakage area. According to the invention, the accuracy of the detection result of the joint leakage detection of the building outer wall is improved.

The utility model discloses a sound-proof decorative plate, which relates to the technical field of decorative plates and comprises a plate main body, the plate main body comprises a decorative plate and a base plate, a sound-proof plate is connected between the decorative plate and the base plate, and the sound-proof plate comprises a front sound-proof plate and a rear sound-proof plate. A plurality of cavity grooves are formed in one side of the front sound insulation plate and one side of the rear sound insulation plate, complex reflection and scattering paths can be formed through the sound insulation folded plates, the contact opportunity of sound waves and sound absorption materials is increased, the problem that the sound insulation effect of a decorative plate is poor is solved, and the sound insulation performance of the decorative plate is improved; the front sound insulation layer, the middle sound insulation layer and the rear sound insulation layer are matched with aperture decreasing, so that the decorative plate can specifically absorb sound waves of different frequencies, the effect of widening the sound absorption frequency band is achieved, the problem that the decorative plate is poor in sound absorption effect of different frequency bands is solved, and the absorption effect of the decorative plate on the sound of different frequency bands can be improved.

The invention discloses an unmanned aerial vehicle precipitation enhancement system and method based on compressed gas sound wave driving, and relates to the technical field of artificial precipitation enhancement, and the method comprises the steps that an unmanned aerial vehicle aircraft provides flight support needed by system high-altitude operation, and supports fixed-height cruise and dual-mode positioning; the high-pressure gas supply module stores compressed gas and provides a continuous and controllable energy source for sound wave generation; the sound wave generation module converts the air pressure energy into sound energy and generates directional low-frequency sound waves, and the directional low-frequency sound waves act on a target cloud area to achieve precipitation enhancement catalysis; the control module is used for unmanned aerial vehicle flight state regulation and control, gas path on-off and pressure adjustment, sound wave frequency closed-loop control, receiving feedback data of all the modules and dynamically adjusting operation parameters through an algorithm. The damping suspension module absorbs counter-acting force generated when sound waves are generated, and interference on the flight attitude of the unmanned aerial vehicle is counteracted. Based on the design, light-weight, low-power-consumption, pollution-free and efficient artificial rainfall enhancement operation can be realized.

The utility model relates to the technical field of loudspeakers, and particularly discloses an invisible sound reinforcement plate which comprises a middle core layer which is a composite base material formed by interweaving carbon fibers and aramid fibers. The supporting layer is arranged at the upper end of the middle core layer, and the supporting layer is composed of a plurality of frameworks with the sections of regular hexagon structures and is of a honeycomb structure as a whole; the sound reinforcement plate has the advantages of high strength, good tensile effect, support of ultrahigh-frequency sound wave conduction, light weight and reduction of the overall weight of the sound reinforcement plate; the supporting layer is composed of a plurality of frameworks with the sections of regular hexagon structures, the whole supporting layer is of a honeycomb structure, rigidity is good, bending resistance is high, deformation is not prone to being caused in the assembling and using process, and therefore the using performance of the sound reinforcement plate is improved. The supporting ribs form a continuous force transmission path and disperse local stress, the trapezoid cross section reduces the stress concentration coefficient, and the buffering wrapping edge is made of silica gel materials, prevents external dust from invading the sound reinforcement plate interlayer and meanwhile plays a role in buffering and shock resistance.

The application relates to the technical field of ultrasonic detection, in particular to a columnar full-angle ultrasonic probe which comprises a protective film, a matching layer, a planar piezoelectric wafer, a damping block and a supporting rod, wherein the protective film is wrapped on the outer wall of the matching layer; the planar piezoelectric wafer is a rectangular frame structure and is embedded in the inside of the matching layer as a whole; the damping block is arranged in the inside of the rectangular frame of the planar piezoelectric wafer and is provided with a through hole in the middle; and the supporting rod is fixedly arranged in the through hole of the damping block. The application can work under high-frequency conditions, the piezoelectric wafer used is rectangular, the preparation difficulty is low and the piezoelectric wafer is not easy to be damaged under high-frequency conditions, the loss of high-frequency sound waves is smaller when the high-frequency sound waves propagate in a medium, the effective detection depth is deeper and the efficiency is higher when the application is applied to the field of flaw detection, the full-angle detection can be carried out without rotating the hollow shaft type object to be detected, the contact wear between the outer surface of the probe and the surface of the object to be detected is small, and the operation is simple.

The invention relates to the technical field of railway vehicles, and provides a sound absorption device and a railway vehicle. In the sound absorption device, a surrounding plate structure and a flexible film in sealed connection form a closed cavity, at least one through hole is formed in the flexible film, hollow pipes and the through holes are arranged in a one-to-one correspondence mode, one ends of the hollow pipes are inserted into the corresponding through holes, and the other ends of the hollow pipes penetrate through a sound absorption structure and extend to an interval space between the sound absorption structure and a cavity bottom. And a coupling resonance sound absorption system of the flexible film, the hollow pipe, the interval space and the closed cavity is formed. According to the sound absorption device, the sound resistance and the sound quality are improved through the hollow pipe, the resonance frequency is made to move to the low frequency in cooperation with dual coupling resonance of the flexible film and the hollow pipe and dual coupling resonance of the hollow pipe and the cavity, and low-and-medium-frequency noise of 100-500 Hz is efficiently absorbed; the two types of coupling resonance cooperate to broaden the sound absorption frequency band, and the sound absorption structure is attached to the flexible film to enhance the sound energy dissipation efficiency. Efficient low-frequency sound absorption can be achieved without increasing the size, the requirements for light weight and thinness of railway vehicles are met, and the noise control effect is improved.

The invention discloses a two-dimensional five-mode metamaterial with compression resistance and low-frequency sound wave characteristics. The metamaterial is of a hexagonal honeycomb structure formed by periodically arranging a plurality of same two-dimensional unit cell structures. Each unit cell structure is of a hexagonal structure formed by connecting six single-cone unit cells end to end. In view of point contact of a double-cone unit corresponding to a traditional five-mode metamaterial, integral connection is adopted for replacement, so that the stability of the structure is effectively improved, and the five-mode metamaterial with more excellent five-mode characteristics, lower frequency and a complete phonon forbidden band can be designed through fine adjustment of parameters. The method has potential application value in the fields of underwater sound wave low-frequency broadband regulation and control, sound stealth, vibration and noise reduction, earthquake protection and the like.

A speaker comprises a magnet, a movable coil, a support element, and a membrane connected to the coil, and the membrane converts the motion of such coil into sound, said membrane being inflatable. According to the invention, the membrane is made of a single piece, is ring-shaped, exchangeable and protrudes from the support element, said ring-shaped membrane producing broadband sound and allowing both low-frequency sound and harmonics thereof, as well as intermediate-frequency and high-frequency sound to be reproduced-in space and in a substantially isotropic manner-.

The invention discloses a lubricant for drilling fluid and a preparation method of the lubricant, and belongs to the field of oil and gas drilling chemical additives. In the water-based drilling fluid, microbubbles I with the diameter of 0.1-1 mu m and microbubbles II with the diameter of 1-10 mu m are prepared in situ, and a low-frequency sound field of 20-50 kHz and a high-frequency sound field of 200-500 kHz are adopted for alternate or superposed driving; the microbubbles I are rapidly broken to release the lubricant to achieve instantaneous efficient lubrication of the initial drilling section, and the microbubbles II are slowly broken to maintain the lubricating film to achieve lasting lubrication of the rear section. The preparation method comprises the following steps: mixing the base oil, the surfactant, the gas precursor and the foam adjusting aid in proportion, performing synchronous gas injection oscillation in a multi-frequency sound field to form a graded microbubble suspension, and performing settling separation and stabilizing treatment to obtain the product. The lubricant can obviously reduce the friction between a drilling tool and a well wall and prolong the service life of the drilling tool, is compatible with an existing slurry system, is free of waste water and waste gas emission in production, does not detect heavy metals after being used, is easy to degrade in surfactant and pollution-free to underground water, meets the requirement of green drilling, and has excellent engineering popularization value.

The application relates to the technical field of audio processing, in particular to an audio processing method, an electronic device and a readable storage medium. In the method, a sound signal is received by a device that can be worn on the ear of a user, then the sound signal is divided into a low-frequency sound signal and a high-frequency sound signal by using a filter, and a steady-state sound signal and a transient sound signal in the low-frequency sound signal and the high-frequency sound signal are extracted. The steady-state sound signal and the transient sound signal are processed based on the individual calibration parameters corresponding to the user, so that the calibrated sound signal finally heard by the user conforms to the target psychoacoustic loudness of the user. In this way, the hearing protection of the user can be realized.

The invention discloses a piezoelectric MEMS loudspeaker based on a folding ring between movable and fixed parts and application thereof, and belongs to the technical field of loudspeakers, the piezoelectric MEMS loudspeaker comprises a piezoelectric actuating assembly, a fixed assembly and a folding ring; the piezoelectric actuating assembly comprises a piezoelectric actuating composite layer, the piezoelectric actuating composite layer at least comprises a piezoelectric material layer, and the piezoelectric actuating composite layer generates mechanical displacement by applying voltage to drive the piezoelectric actuating assembly to vibrate so as to generate sound pressure; the fixing component can be a single structural component or a component with a plurality of structural components; the fixing assembly can be used for fixedly supporting the fixed supporting part of the piezoelectric actuating assembly, so that the non-fixed supporting part of the piezoelectric actuating assembly can freely move or vibrate; according to the invention, through the innovative design based on the folding ring between the moving part and the fixed part, the low-frequency vibration displacement of the vibrating diaphragm is remarkably improved, the problem that the low-frequency sound pressure of a traditional piezoelectric MEMS loudspeaker is insufficient is effectively solved, and the vibrating diaphragm can push air with a larger volume in a low-frequency band, so that a fuller low-frequency sound effect is obtained.

Disclosed are embodiments of a vibrating bed which allows a particular person to induce a customized vibrational pattern that they find particularly therapeutic. In certain embodiments, the bed has a water mattress, a carriage for the mattress, a hardwood frame to support the carriage, a transducer for producing different vibrational patterns in the mattress, a vibrotactile amplifier for controlling the transducer, a computer for controlling the amplifier and software on the computer for producing sounds of particular frequencies to induce the vibrational patterns in the water mattress.

The invention belongs to the technical field of acoustic lenses, and discloses a high-frequency vortex sound field lens which comprises a stainless steel sheet substrate, the center area of the substrate is a solid area, and a periodic spiral line hollow structure is formed on the periphery of the solid area through laser processing; the area where the spiral line hollow structure is located allows sound waves to pass without shielding, and the solid area blocks sound wave propagation. The ultra-short pulse laser micromachining technology is adopted, the spiral line hollowed-out structure with the screw pitch, the line width and the spiral angle strictly matched with the high-frequency sound wave wavelength can be accurately etched in the surface of the stainless steel sheet, the spiral phase gradient is accurately constructed through the acoustic impedance difference of hollowed-out area conduction-solid area blocking, and the spiral phase gradient is accurately measured. The problem of phase error amplification under high frequency is effectively suppressed, the orbital angular momentum transfer efficiency is improved to 90% or above, and stable generation of a high-frequency vortex sound field is successfully realized.