403 results about "Sound energy" patented technology

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The invention discloses a transcranial ultrasonic stimulation device and a focal length adjusting method, and relates to the technical field of medical instruments and ultrasonic therapy. The screwing assembly is arranged on the outer side of the bottom of the ultrasonic transducer, and the ultrasonic transducer is rapidly disassembled and assembled through the screwing assembly; and the ultrasonic coupling assembly is arranged at the bottom of the screwing assembly and is matched with the ultrasonic transducer, and the ultrasonic coupling assembly is used for reducing air gaps during fitting so as to reduce the sound energy loss. Through the cooperative arrangement of the ultrasonic transducer, the screwing assembly and the ultrasonic coupling assembly, accurate ultrasonic conduction can be achieved, the device can adapt to a complex head shape, especially in complex target spots such as binaural areas, the flexible characteristic of the soft bag ensures that the soft bag is tightly attached to the head tissue, and the effect that the soft bag is tightly attached to the head tissue is achieved. Consistent sound wave conduction can be provided, interference of air or other substances is avoided, and the treatment effect is remarkably improved.

The invention relates to the field of speech analysis, and discloses a natural sound interference stripping algorithm and an application thereof in noise monitoring, which are used for efficiently and accurately stripping interference components in a target speech signal in a complex natural sound environment. Comprising the following steps: synchronously acquiring an environmental sound signal by using a spatially distributed microphone array, generating an original mixed voice signal with spatial coherence, performing real-time fractional order differential processing, strengthening resonance characteristics, realizing spatial separation of a voice guided wave mode and an interference radiation mode through real-time phase analysis, and extracting an interference radiation mode component. And reconstructing a time domain interference waveform, and outputting a pure target voice signal according to the original mixed voice signal and the reconstructed interference waveform. The system has the functions of residual interference sound energy recovery, equipment vibration suppression, environment sudden change monitoring, system resetting, bimodal output and the like, the stability, reliability and practicability of the system are effectively improved, and pure voice can be accurately extracted in a complex environment.

The invention provides a Helmholtz silencer with broadband sound absorption performance, and belongs to the technical field of silencers. Comprising a tubular neck and a cylindrical back cavity, a plurality of annular thin plates are evenly arranged and fixed on the inner wall of the cylindrical back cavity in the length direction, the distance between every two adjacent annular thin plates is larger than 0 and smaller than 3 mm, and the inner diameters of the annular thin plates are gradually reduced from the tubular neck to the interior of the cylindrical back cavity. A plurality of annular thin plates are fixed in the cylindrical back cavity, so that a gap between two adjacent annular thin plates forms a sound absorption unit, and the inner diameters of the plurality of annular thin plates are gradually reduced from the tubular neck part to the interior of the cylindrical back cavity according to index change; the sound absorption frequency band of the sound absorption device does not completely depend on the inherent frequency generated by resonance of an air column at the neck of the Helmholtz silencer, the structure is simple, the cost is low, the sound energy dissipation when sound waves enter the Helmholtz silencer can be increased, and the sound absorption device has good broadband sound absorption performance.

The utility model relates to a phase change thermo-acoustic engine experimental device which comprises a thermo-acoustic conversion system and an acoustic-electric conversion system. The thermo-acoustic conversion system comprises a sound production module and a Helmholtz resonant cavity, a ceramic plate stack soaked with water exists in the sound production module, and the stable temperature difference needed for generating the thermo-acoustic effect at the two ends of the ceramic plate stack is reduced. Sound waves generated by the thermoacoustic effect form standing waves in the Helmholtz resonant cavity, and the sound intensity is amplified; the acoustic-electric conversion system comprises piezoelectric ceramics and a triode common-emitter amplification circuit, the piezoelectric ceramics are arranged at the tail end of the resonant cavity and convert acoustic energy into electric energy, and the electric energy is amplified by the triode common-emitter amplification circuit and then drives a nixie tube to display. The experimental device integrates thermodynamics, fluid mechanics, acoustics, material science and electronic technology, has the characteristics of simple structure, low cost, rich physical process and strong exploration, is suitable for experimental teaching, particularly suitable for new engineering teaching requirements, and is beneficial to improving the multidisciplinary cross practice ability of students.

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 discloses an air pipe type air conditioner which comprises a shell, an air pipe, an air inlet pipe and an air outlet pipe. An air duct is defined by the air duct component; the wind wheel is used for driving airflow to enter the shell from the air inlet, flow through the air duct and be exhausted from the air outlet; the heat exchanger is located between the outlet of the air duct and the air outlet in the airflow direction; wherein the air duct component comprises a base plate and a volute, the base plate is fixed in the shell, at least part of an air duct is defined by the volute, the base plate is suitable for defining a noise reduction cavity, noise reduction holes are formed in the base plate, and the noise reduction cavity is communicated with the air duct through at least one noise reduction hole. According to the air duct type air conditioner, the noise reduction cavity communicated with the air duct is formed, sound waves in the air duct can enter the noise reduction cavity through the noise reduction holes, the sound waves resonate after entering the noise reduction cavity, sound energy is consumed through the resonance effect, and therefore the purposes of sound absorption and noise reduction are achieved. Noise reduction is achieved while the size of the air duct type air conditioner is not increased.

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 relates to the technical field of mining machinery intelligent monitoring, and discloses a remote monitoring system and method based on a crusher. According to the system, an original current waveform and a bearing voiceprint signal in a starting stage are collected through an initial state sensing unit, a current waveform deviation spectrum is generated, sound energy of a specific frequency band is extracted, and an initial state data set is formed through fusion; the dynamic operation analysis unit monitors a power fluctuation period, a torque change slope and a material flow noise spectrum in a steady state, and generates a real-time operation state flow; the self-adaptive regulation and control unit identifies an abnormal correlation mode of power and torque, starts fine adjustment of the feeding speed when the torque slope exceeds a threshold, and dynamically adjusts an instruction according to real-time feedback of noise characteristic frequency band energy. According to the scheme, early diagnosis of hidden faults of the equipment and predictive smooth control of the material blocking risk are realized, and the equipment reliability and the production continuity are improved.

The utility model discloses a kind of transcranial ultrasound stimulation devices, it is related to medical instrument and ultrasonic treatment technical field, comprising: ultrasonic transducer;Tightening assembly, it is set to the bottom outside of ultrasonic transducer, and the quick disassembly and installation of ultrasonic transducer are realized by tightening assembly;Ultrasonic coupling assembly, it is set to the bottom of tightening assembly and is matched with ultrasonic transducer, and by ultrasonic coupling assembly, air gap when fitting is reduced to reduce sound energy loss.The utility model is matched by ultrasonic transducer, tightening assembly and ultrasonic coupling assembly, not only can realize accurate ultrasonic wave conduction, can also adapt to complex head shape, especially at complex target point such as binaural area, the flexible characteristic of its soft bag guarantees close fitting with head tissue, so that it can provide consistent sound wave conduction, avoid the interference of air or other material, significantly improve the effect of treatment.

A time-of-flight (TOF) array including a plurality of cameras is positioned with a coplanar Higher Order Ambisonics (HOA) array including a plurality of microphones above a target area such as a room or space for analyzing speaker activity in that area. The HOA microphone array iteratively samples sound energy level frames captured by the microphones to identify a sound vector associated with the global maximum energy level in the sound energy level frame. This sound vector is fused with the data from the TOF camera array that identified the positions of sound sources in the target area to associate produced sound corresponding with the sound vector with a physical active sound source in the target area. A beamformer can then be used to save audio corresponding to the sound vector and discard audio not associated with the sound vector to produce a sound recording associated with the active sound source.

The utility model provides a thermal insulation layer pressurized anti-corrosion chimney, which relates to the technical field of anti-corrosion chimneys and comprises a chimney body, a chimney cap and a chassis, the chimney cap is arranged at the top of the chimney body, the chassis is fixedly connected to the bottom end of the chimney body, an air inlet is arranged on one side of the bottom end of the chimney body, and an air outlet is arranged on the other side of the chimney body. An air supply mechanism is arranged on one side of the air inlet, a noise elimination mechanism is arranged between the air supply mechanism and the air inlet, and the chimney body comprises an outer cylinder, a heat insulation layer and a lining; the fan is communicated with the connecting cover through the ventilation pipe, the connecting cover is installed at one end of the fixing sleeve, the fan conveys air pressure into the fixing sleeve through the ventilation pipe, and the silencing cylinder is clamped into the fixing sleeve through the clamping ring. The sound waves can excite air molecules in countless small holes in the silencing cylinder and the sound absorption sleeve to vibrate, and part of sound energy is consumed to overcome friction force and viscous force, so that silencing is achieved, and noise generated by conveying air pressure is reduced.

This invention discloses a reconstituted bamboo sound barrier and its manufacturing method, relating to the field of sound barrier technology. Specifically, it is a reconstituted bamboo sound barrier comprising spaced, inclined columns, with standard modular screen bodies fixed between the columns by clamping angle steel. The screen body uses a reconstituted bamboo main screen body as the core sound-absorbing body, combined with reconstituted bamboo panels, reconstituted bamboo cavities, reinforcing frames, and other components. The reconstituted bamboo panels have 0.3mm-1.0mm micro-perforations, forming an auxiliary sound-absorbing structure with the sealed reconstituted bamboo cavities, enhancing the sound absorption effect of the reconstituted bamboo main screen body. The diffusion texture of the reconstituted bamboo main screen body disperses reflected sound waves, improving the uniformity of the sound field, allowing more sound energy to "penetrate" into the sound-absorbing material and be consumed. The manufacturing process involves bamboo bundle pretreatment, shaping, and assembly, resulting in a product with low cost, light weight, good durability, environmental friendliness, and excellent acoustic performance, suitable for noise control on highways, railways, and other road sections.

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

The present invention discloses a subwavelength ventilated asymmetric sound absorber, which is composed of one or more absorption cells. The absorption cell includes a metamaterial resonator and a backing impedance boundary. The backing impedance boundary includes a rear panel, a top panel, a bottom panel, a long plate and a short plate, which together form an L-shaped structure; a flow port is provided on the upper portion of the rear panel to facilitate airflow; the bottom of the metamaterial resonator is placed on the short plate of the backing impedance boundary, and a channel is left between it and the bottom plate of the backing impedance boundary; the back of the metamaterial resonator is fixedly connected to the side of the long plate of the backing impedance boundary, and a channel is left between it and the rear panel of the backing impedance boundary. The deep subwavelength absorber of the present invention can almost perfectly absorb the sound energy incident from the loss end and almost perfectly reflect the sound energy incident from the opposite end, has a good suppressive effect on broadband noise, and can achieve ventilation and heat dissipation functions while controlling noise.

The invention provides a spiral-like sensing assembly and an imaging system thereof, and belongs to the technical field of sensing and detection. The sensing assembly comprises a bottom lining layer and a vibration diaphragm layer, the bottom lining layer is of a spiral-like cavity structure, the vibration diaphragm layer comprises a supporting layer, a plurality of electrode layers and at least one piezoelectric layer, and the positions of the supporting layer, the electrode layers and the piezoelectric layer correspond to each other and are geometrically matched. The plurality of sensing units with different sizes are arranged according to a spiral-like path, and the wave crests and the wave troughs of sensitivity curves are mutually compensated and coupled; the imaging system is composed of a spiral array formed by the sensing assembly, a sound wave emission unit, a central processing module and a display device, and the array further comprises a sound impedance matching layer to improve the sound energy transmission efficiency. The response bandwidth of the sensing assembly is effectively widened, the detection sensitivity and precision of the imaging system are remarkably improved, and the method can be applied to target detection, position calibration and route planning, underwater acoustic communication transmission, fishery breeding monitoring, geological structure exploration and the like; and a certain reference is provided for exploration of light weight and informatization of future equipment.

The invention belongs to the technical field of transformers, and particularly relates to a dry-type transformer which comprises a shell, a sealing door is arranged on one side of the shell, and a transformer body is mounted in the shell; a water storage tank is formed in the shell and used for storing water, and the water is used for reducing noise when the transformer body works; a water inlet groove is formed in the top surface of the shell, and the water inlet groove is communicated with the water storage groove; the water storage tank is filled with water, then the end opening of the water storage tank is sealed by means of the sealing plate, at the moment, when noise generated during working of the transformer body is spread in water, a large amount of sound energy is consumed through friction and viscous effects of sound waves and water molecules, spreading of the sound waves can be greatly hindered, and therefore the noise reduction effect is achieved; and meanwhile, the water can absorb heat generated when the transformer body works, so that the cooling effect is achieved.