566 results about "Noise elimination" patented technology

The invention discloses a building live-action three-dimensional reconstruction system based on point cloud data, and relates to the technical field of building live-action three-dimensional reconstruction, the building live-action three-dimensional reconstruction system comprises a preprocessing module, a multistage adaptive noise filtering module, a semantic and geometric joint reasoning module and a three-dimensional model generation module which are connected in sequence; the preprocessing module is used for receiving original building point cloud data, performing registration and initial space division, and outputting a registered point cloud data set. According to the building live-action three-dimensional reconstruction system based on the point cloud data, by introducing a multi-stage adaptive noise filtering and semantic geometry joint reasoning cooperation mechanism, the contradiction that noise elimination is inaccurate and feature details are easy to lose in a complex building scene in an existing method is effectively solved. The system can intelligently distinguish the real discrete noise from the inherent complex geometric features of the building, and maintains the integrity of the details such as decorative members and curved roofs to the greatest extent while ensuring the denoising effect, thereby achieving the high-fidelity point cloud data preprocessing.

The invention relates to the technical field of fracturing wellhead pressure prediction, and discloses a fracturing wellhead pressure real-time prediction method and system, and the method comprises the following steps: collection processing: collecting multi-field data in a fracturing wellhead fracturing process, and carrying out noise elimination and time-space alignment to obtain a standardized time series data set; parameter identification: based on the standardized time series data set, calculating fracture fractal dimensions, fractional order parameters, temperature-sensitive viscosity and random disturbance intensity in the fracturing process by analyzing fracture fractal features and a multi-field coupling relationship to obtain multi-field parameters; and model construction: constructing a physical model fusing fractional order characteristics and random disturbance based on the multi-field parameters. The method comprises the following steps: acquiring and processing multi-field data to obtain a standardized time series data set, extracting multi-field parameters, constructing a physical model fusing fractional order characteristics and random disturbance based on the multi-field parameters, solving by combining fracture expansion constraint conditions, and carrying out weighted fusion on pressure and residual errors of the physical model.

The invention relates to the technical field of aluminum alloy part casting processes, in particular to a multi-parameter collaborative optimization system and method for a new energy aluminum alloy part casting process. According to the technical scheme, the multi-parameter collaborative optimization system for the new energy aluminum alloy part casting process comprises a multivariate heterogeneous data acquisition module, a multi-physics field coupling optimization module, an intelligent execution control module, a virtual-real fusion verification module and a man-machine collaborative decision module; by deploying the melt state monitoring unit, the mold dynamic thermal field sensing unit and the equipment health monitoring unit, all-around and high-precision monitoring of melt, mold and equipment states is realized, and meanwhile, space-time alignment and noise elimination are performed on multi-source data through a Kalman filtering algorithm; and generating a characteristic matrix containing a melt fluidity index, a mold temperature gradient field and an equipment health state, and providing a high-quality data basis for subsequent optimization.

The invention provides a radon gas detection method and device, electronic equipment and a storage medium. The method comprises the following steps: collecting a plurality of first electric signals from electric signals flowing through a comparator according to a preset time interval in a target time range; in response to the received interrupt signal from the comparator, determining a second electric signal corresponding to the occurrence moment of the interrupt signal from the plurality of first electric signals; determining a first noise value according to the plurality of third electric signals; the first range value is compensated according to the first noise value, a second range value is determined, the first range value is used for representing a signal peak range of particles corresponding to radon in a noise elimination state, and the plurality of third electric signals are signals different from the second electric signals in the plurality of first electric signals; determining a fourth electric signal whose signal peak value satisfies a second range value from the second electric signals; and determining the concentration value of the radon gas according to the number of the fourth electric signals. The accuracy of radon gas concentration detection can be improved.

The invention relates to an electrical equipment room environment humidity control method and system based on difference comparison. The method comprises the following steps: acquiring original humidity signal data through a humidity sensing array, and performing noise elimination processing to obtain humidity data; calculating a humidity change rate based on the humidity data, comparing the humidity change rate with a preset threshold value, and evaluating the environmental humidity complexity; establishing an equipment humidity demand evaluation model and generating an equipment humidity demand matrix in combination with the physical position, the humidity demand and the environmental humidity complexity of the electrical equipment; based on the matrix, fusing environment state parameters and equipment operation state parameters, and calculating a target comprehensive humidity value by adopting a dynamic weight distribution method; the deviation between the target comprehensive humidity value and the actual humidity data is calculated through a feedback control algorithm, and a humidity control instruction is generated to drive humidity adjusting equipment to execute operation. According to the method, through multi-dimensional parameter fusion and dynamic weight distribution, the accuracy and adaptability of humidity control in a complex environment are improved.

The invention discloses an induction heating path optimization method suitable for a heterogeneous noise elimination structure, and particularly relates to the field of induction heating path optimization of the heterogeneous noise elimination structure, and the method comprises the steps: building a grid coordinate in a target region, collecting the heat conductivity coefficient, the specific heat capacity, the thermal resistance value and the induction coil gap value of each grid node in the grid coordinate, generating a thermal response model; and performing heat conduction calculation on the thermal response model and a preset heating power curve, calculating a temperature rise value of each grid node in a fixed preset heating time, marking the grid nodes of which the temperature rise values reach or exceed a safe temperature threshold and the adjacent grid nodes as heat concentration areas, and generating risk area data after gathering the heat concentration areas. A risk assessment and dynamic reordering mechanism based on local thermal characteristic difference is introduced in a heating path planning process, so that advanced identification and real-time avoidance of a heat concentration area are realized.

The present application relates to pipeline system damping and noise reduction technical field, provide a kind of active noise cancellation pressure relief valve, comprising: valve body, with the liquid inlet cavity and pressure relief cavity being communicated are formed;Bypass pipe, with liquid inlet cavity is communicated;Piezoelectric actuator and pressure relief component, pressure relief component includes adjusting piece, pressure relief elastic piece and pressure relief valve core, pressure relief valve core and pressure relief elastic piece are set in pressure relief cavity, adjusting piece is movably arranged on valve body, piezoelectric actuator is arranged on adjusting piece, pressure relief elastic piece is pressed between piezoelectric actuator and pressure relief valve core;Piezoelectric actuator is configured to drive pressure relief elastic piece, to eliminate the transient noise caused by pulsating pressure when pressure relief valve core moves.The active noise cancellation pressure relief valve provided by the present application introduces active noise cancellation technology into the active noise cancellation pressure relief valve pulsating noise control by arranging piezoelectric actuator, can be adjusted by pressure relief elastic piece The force exerted on the pressure relief valve core can eliminate the transient noise caused by pulsating pressure when the pressure relief valve core moves.

The invention provides a control method and a control system for building an independent acoustic space of an automobile cabin, which are applied to the technical field of sound field control of the automobile cabin, and are used for inputting a multi-channel vibration signal acquired in real time into a deep learning noise prediction model to obtain an in-automobile background noise prediction value at a future moment; the prediction noise is filtered by the secondary path estimation model and then is used as a feedforward reference signal for active noise reduction, and the prediction noise and a residual signal collected by a bright area error microphone are jointly used for weight updating of an adaptive filter; the updated filter generates a reverse-phase noise elimination signal and the reverse-phase noise elimination signal is played by a secondary loudspeaker in real time so as to counteract background noise of the bright area; and closed-loop adjustment of the noise reduction effect is formed based on the sound pressure level contrast ratio of the bright and dark areas, so that the independent acoustic space is kept stable in the time-varying environment of vehicle driving. According to the method, the low noise of the bright area and the isolated sound field of the dark area in the vehicle are realized by fusing deep learning noise prediction and active noise control, and the personalized auditory experience in the vehicle can be remarkably improved.

The invention relates to the technical field of exhaust and noise elimination, and discloses a wind power cabin exhaust silencer which comprises an exhaust pipe and a noise elimination pipe which are communicated with each other, an exhaust fan for driving gas to move towards the noise elimination pipe is arranged in the exhaust pipe, and multiple sets of sound absorption assemblies rotating synchronously are arranged in the noise elimination pipe. A gap for air to flow is formed between every two adjacent sound absorption assemblies, and an acute included angle is formed between the plane of each sound absorption assembly and the airflow direction; the sound absorption assembly comprises a first rotating frame and a second rotating frame which are sequentially arranged in the airflow direction and hinged to each other, and sound absorption plates are arranged on the side faces, making contact with airflow, of the first rotating frame and the second rotating frame. According to the silencer, by arranging the included angle adjusting assembly, the included angle between the first rotating frame and the second rotating frame in the silencing pipe is dynamically adjusted, linkage control is conducted on the included angle and the rotating speed of the exhaust fan, and the silencing performance of the silencer can be adaptively optimized according to the actual thermal load of a wind power cabin.

The invention relates to the technical field of pipeline noise elimination, in particular to a pipeline elbow noise reduction device which comprises a connecting elbow, an inner silencer is embedded in a bend of an inner cavity of the connecting elbow, a cavity exists between the inner silencer and the inner wall of the connecting elbow, and a neck bush is arranged between the inner silencer and the inner cavity of the connecting elbow. The inner silencer comprises an inflow part, an inward shrinkage part, a flow guide part and a discharge part which are integrally formed through flexible rubber, the inner diameters of the inflow part, the inward shrinkage part, the flow guide part and the discharge part are smoothly and gradually changed in the flow direction, and the outer wall of the inner silencer and the inner wall of the neck bush are seamlessly attached together. The silencer has the beneficial effects that the gradual change section design of the inner silencer maintains a laminar flow boundary layer through continuous curvature change, and flow separation is effectively reduced; the spiral flow guide fins are used for disassembling macroscopic vortex into micro-scale turbulent flow, so that energy dissipation is accelerated, and medium-high frequency noise is improved in a targeted manner; the sound absorption part is filled with an efficient sound absorption material, and a complementary silencing mechanism is formed with flow field optimization.

The invention provides a high-precision low-delay successive approximation analog-to-digital converter based on sampling noise elimination, and the analog-to-digital converter comprises a main capacitor group which generates an original combined signal according to an original sampling signal and primary sampling noise in a secondary sampling stage; the pre-quantization capacitor bank is used for driving a bottom plate switch of the pre-quantization capacitor bank according to the detection control signal, switching a capacitor weight through a weight control signal to execute pre-quantization operation on the original combined signal and outputting a swing suppression signal; the novel sampling noise elimination module is used for receiving the swing suppression signal, performing gain amplification, generating a purification amplification signal, detecting the differential swing of the original combined signal in real time, and generating a detection control signal and a pre-quantization code according to the differential swing; the successive approximation quantization module is used for generating a main quantization code and a weight control signal according to the purification and amplification signal in a quantization stage; and the digital processing module is used for fusing the pre-quantized code and the main quantized code to obtain a final digital code. And the energy efficiency and the conversion precision of analog signal conversion are obviously improved.

The invention discloses a design method of an array type silencer adaptive to a main ventilation air path between a stator iron core of a hydraulic generator and an air cooler and the array type silencer, and relates to the technical field of suppression or reduction of noise of the hydraulic generator. The method comprises the steps of S1, obtaining aerodynamic noise data and airflow parameters of a main ventilation air path, S2, determining a silencing thought and a micro-perforated plate array core structure according to broadband vortex, discrete rotation, vortex falling and surge noise, S3, determining the boundary dimension and preliminarily calculating the airflow parameters, S4, designing plate parameters in combination with a micro-perforated resonance formula, and S5, calculating the noise of the micro-perforated plate array. S5, performing simulation optimization and S6, accurately accounting airflow parameters, and locking a scheme meeting requirements; the silencer comprises a shell and a plurality of micro-perforated plates, and the multiple layers of micro-perforated plates are arranged in series. The invention has the advantages of no sound absorption material, low wind resistance (the air volume attenuation is less than or equal to 5%, and the pressure loss is less than or equal to 200Pa), the noise of the main wind path is reduced by 5-7dB (A), the service life is long, the operation and maintenance cost is low, and the requirements of the main wind path are met.

The invention relates to a multi-channel acoustic black hole sound absorption structure and a silencing device, belongs to the technical field of noise control, and solves the defects of a current acoustic black hole sound absorption structure. The multi-channel acoustic black hole sound absorption structure comprises a shell, one side of the shell is open, and the open side of the shell is used for receiving incident sound waves; partition plates are arranged in the shell to divide the space in the shell into a plurality of sound absorption channels, a plurality of rib plates are arranged in each sound absorption channel, the outer ends of the rib plates are fixed to the inner side face of the shell, the rib plates are arranged perpendicular to the incidence direction of sound waves, the rib plates are arranged at intervals in the incidence direction of the sound waves, and the rib plates are arranged at intervals in the incidence direction of the sound waves. The widths of the multiple rib plates are gradually increased, the inner ends of the multiple rib plates are distributed in a set power law function mode, the inner ends of the multiple rib plates are attached to the outer side face of the perforated plate and fixedly connected with the perforated plate, and the sound absorption structure can better achieve ultra-wideband sound absorption.

The invention provides an ultrathin broadband sound absorption composite structure which comprises a plurality of silencing units, every two of the silencing units are in contact with each other on the same plane to form the three-dimensional ultrathin broadband sound absorption composite structure, each silencing unit comprises a shell, a through hole is formed in each shell, and the through holes are communicated with the silencing units. A thin film is arranged in the position, located in the center of the three-dimensional ultra-thin broadband sound absorption composite structure, of the shell, a micro-pore plate is arranged in the position, located on the periphery of the three-dimensional ultra-thin broadband sound absorption composite structure, of the shell, and the micro-pore plate or the thin film or other resonance structures are arranged in the micro-pore plate or the thin film or other resonance structures in the micro-pore plate or the thin film or other resonance structures. The ultra-thin broadband sound absorption composite structure provided with the micropore plate and the thin film is small in size, the thickness of the ultra-thin broadband sound absorption composite structure is 1 / 23 of the sub-wavelength size, the ultra-thin broadband sound absorption composite structure has the ultra-thin characteristic, the sound absorption frequency band is wide, the noise reduction effect is good, and the ultra-thin broadband sound absorption composite structure can be suitable for sound absorption and noise reduction of various small places and spaces.

The invention provides a screw compressor and a refrigerating system with the screw compressor. A second noise elimination reaction cavity is formed in the position, close to a first noise elimination reaction cavity, of an economizer pipeline for connecting the economizer and the compressor. Pressure pulsation in the economizer pipeline is mainly generated by large pressure difference between refrigerant gas in the compression containing cavity and refrigerant gas in the economizer pipeline, and the distance between the second noise elimination reaction cavity and the first noise elimination reaction cavity is controlled. Different sizes of the silencer reaction cavities are designed according to the operation condition of the compressor, so that the pressure pulsation transmitted from the compression cavity of the compressor can realize good pressure pulsation attenuation within the first-order and second-order target frequency range of the concerned rotating speed after passing through the first silencing reaction cavity and the second silencing reaction cavity; the effective pulsation attenuation frequency range is widened to a great extent so as to adapt to pressure pulsation generated by the compressor under different frequency working conditions.

The invention discloses an aeroacoustic wind tunnel corner noise elimination flow deflector, a flow deflector group and a design method, and belongs to the technical field of aeroacoustic wind tunnel test equipment. The corner flow deflector aims at solving the technical problems that an existing corner flow deflector cannot give consideration to aerodynamic performance and noise elimination performance, and a special shape design method and a combination application scheme are lacked. The noise elimination flow deflector is of an integrated structure formed by sequentially connecting a semi-oval front edge, a front straight section, an arc section, a rear straight section and a wedge-shaped tail edge, and key parameters of the upper profile and the lower profile are designed in an associated mode. The flow deflector set is formed by combining and installing at least two noise elimination flow deflectors according to a specific rule, and a uniform-section airflow channel is formed. According to the design method, coupling optimization of the noise elimination amount and the aerodynamic performance is achieved through a parameterized design process in combination with the Picrov formula, and the design method has the advantages of being high in noise elimination efficiency, small in aerodynamic loss and good in airflow uniformity, is suitable for a symmetric corner aerodynamic acoustic wind tunnel and can be widely applied to aerodynamic noise tests in the fields of aviation, automobiles and the like.

The invention discloses a strong premixing combustion chamber for restraining combustion noise based on a Helmholtz resonant cavity, and relates to the technical field of energy and power. Air and fuel enter the mixing cavity through corresponding connectors to be strongly premixed, premixed gas enters the hearth to be combusted through slit channels among water cooling channel branch pipes, a water cooling channel array can prevent backfire, the Helmholtz resonant cavity is connected with the hearth through a cavity neck and is provided with an air film cooling channel, the size of the Helmholtz resonant cavity needs to measure combustion noise, and a frequency spectrum is analyzed to obtain characteristic frequency. The neck length, the cross section area and the resonant cavity volume are calculated according to a Helmholtz resonance formula, and the sound absorption effect is verified in combination with a low-order thermoacoustic model. Combustion efficiency is improved through the strong premixing and slit water cooling design, tempering is prevented, NOx is reduced, the diffusion combustion problem is solved, the targeted design resonant cavity is matched with air film cooling, the defects that an existing silencing structure is large in size, poor in adaptation and low in high-temperature reliability are overcome, complex active control is not needed, cost is low, applicability is high, and the application range is wide. And cooperative control of high efficiency, low emission and unstable combustion is realized.

The invention relates to the technical field of optical fiber sensing signal processing, in particular to a DAS signal floor noise elimination method, system and equipment based on statistical analysis, and the method comprises the steps: initializing system parameters, and loading a DAS application field data matrix; performing slicing and frequency domain transformation on the DAS original data; dynamically determining a peak threshold value, and performing adaptive peak searching according to the peak threshold value; sorting the identified and screened local maximum values in a descending order, and selecting frequencies corresponding to the local maximum values as main frequency candidates; performing clustering analysis on the selected dominant frequency candidates; calculating the cumulative proportion of each main frequency in the total statistics, selecting a center frequency, and forming the multi-frequency band elimination of the monitoring unit by using band elimination frequency bands formed by different center frequencies; and adding the multi-frequency band elimination to a statistical filtering frequency band set of all the point locations, storing the statistical filtering frequency band set of all the point locations as a statistical model, and performing background noise elimination on the DAS original signal based on the statistical model.

The invention relates to the technical field of PLC (Programmable Logic Controller) control parameter setting, and discloses a PID (Proportion Integration Differentiation) parameter intelligent setting method and system based on a PLC control system. According to the method, a process variable signal, a set value signal and an actuator output signal are collected in real time through a PLC communication protocol, feature quantities are extracted after smooth filtering and noise elimination processing, and a standardized control data set is formed; querying matched setting strategy entries by using the set, calculating complexity indexes, evaluating parameter configuration compliance conditions, and generating setting state judgment of a single control loop; detecting common entities among the loops and calculating an interaction strength index by combining a plurality of standardized control data sets, and generating a multi-loop interaction relation graph; and based on the map fusion setting state judgment, calculating the overall quality score and forming a setting recommendation scheme, and after field verification and closed-loop control simulation test, outputting a final PID parameter setting instruction.

The application provides a multi-head fan-shaped combustion chamber test piece with a sound-absorbing cavity and a sound-absorbing adjusting method. The test piece comprises a bearing casing between an air inlet pipe and an air outlet pipe; an air inlet assembly arranged in the bearing casing, wherein the air inlet assembly comprises a flow regulation pipe and a diffuser pipe, the flow regulation pipe comprises an inlet baffle and a flow regulation pipe, the diffuser pipe comprises a fixed plate, a flow guide pipe, a flow expansion pipe and a conical wall, the upper and lower ends and the left and right ends of the flow regulation pipe and the diffuser pipe are connected with the bearing casing, a plurality of first acoustic damping holes are formed in the flow regulation pipe, and a plurality of second acoustic damping holes are formed in the conical wall; and a flame tube assembly arranged at an air outlet of the air inlet assembly. The frequency of a first Helmoltz resonator formed by the flow regulation pipe and the bearing casing is the same as the disturbance frequency of the airflow in the air inlet pipe; and the frequency of a second Helmoltz resonator formed by the diffuser pipe and the bearing casing is the same as the combustion oscillation frequency in the flame tube assembly. The application can effectively suppress combustion oscillation, maintain stable airflow and reduce noise.

The invention relates to an intelligent assistance system and method for labor arbitration, and the system comprises a data preprocessing module which receives case process document data, carries out the format unification, noise elimination and security attribute specification processing of case appeal and case fact files, and generates a standardized case process file copy; the legal element matching module is used for carrying out law article retrieval and fact corresponding operation on the preprocessed case appeal and case fact data to obtain laws and regulations suitable for the case and a mapping matrix of the case fact and appeal; the arbitration module is used for inputting the optimized legal provisions and the fact-appeal matrix into a Qwen-72B model to generate a judgment document draft which is sufficient in legal basis and associated with facts; and the RLHF human reinforcement learning feedback module collects feedback of a gutta-percha through an RLHF mechanism to construct a judgment quality evaluation method, and continuously optimizes a generation strategy of a Qwen-72B model by using a PPO algorithm. The method comprises the following steps of: accurately matching law articles, associating factual elements, generating arbitration suggestions, and feeding back an optimized closed loop.

The present application relates to the field of analog integrated circuit technology, and particularly relates to a kind of sampling and holding circuit based on noise cancellation.The present application handles sampling noise by introducing noise cancellation technology, input signal is directly connected to the upper plate of C1, C1 samples during S1 switch is closed;The output end of operational amplifier is connected with the lower plate of C2 through S2 switch, C2 samples sampling noise during S2 switch is closed, C2 two ends are connected with C1 two ends through S3 switch, C1 and C2 share charge during S3 switch is closed;Dynamic operational amplifier output end is connected with latch at the same time, so as to use operational amplifier as the preamplifier of comparator.The present application effectively suppresses the deterioration of sampling noise under the condition of reducing sampling capacitor, and dynamic operational amplifier greatly reduces the power consumption and noise of sampling and holding after introducing operational amplifier, and C2=C3 can also be set to make the gain of dynamic operational amplifier in noise elimination stage and subsequent as comparator preamplifier be equal, further improve the precision of circuit.

The noise reduction device for the air source heat pump unit comprises an air outlet pipe and a connecting cover, the connecting cover is arranged in the air outlet pipe, four sets of L-shaped buckles are arranged on the inner wall of the air outlet pipe at equal intervals, four sets of limiting buckles are installed on the outer wall of the connecting cover at equal intervals, and the limiting buckles are in sliding connection with the L-shaped buckles. Locking pins are symmetrically installed on the outer wall of the air outlet pipe and penetrate through the air outlet pipe, inserting holes are formed in the positions, on one sides of the locking pins, of the side wall of the connecting cover, the locking pins can be inserted into the inserting holes, multiple sets of A external threads are arranged on the side, away from the air outlet pipe, of the connecting cover at equal intervals, and silencing cylinders are arranged on the surfaces of the A external threads. And B internal threads are arranged on the inner walls of the silencing cylinders. According to the utility model, convenient multi-position noise elimination and noise reduction are realized, the device can be conveniently and quickly disassembled and assembled, and the disassembly and assembly convenience and the noise reduction effect of the device are improved.

The application discloses a noise reduction ventilation cooling device and a tunnel system, and belongs to the field of tunnel ventilation and cooling devices.The tunnel system comprises the noise reduction ventilation cooling device, and the noise reduction ventilation cooling device comprises a ventilation noise reduction assembly and a cooling assembly.During ventilation, air passes through the sound-absorbing through holes of the sound-absorbing members, so that the noise generated in the ventilation process of the tunnel system is absorbed.During cooling, the sound-absorbing members on the cavity walls of the ventilation cavity can absorb the noise generated in the cooling process of the heat exchange medium of the heat exchange circuit, so that a low noise level is maintained.Further, the noise reduction ventilation cooling device integrates noise reduction, ventilation and cooling, and is equivalent to a combined device for noise reduction, ventilation and cooling.The sound-absorbing members are used to reduce noise in the ventilation process and the cooling process, so that the tunnel space occupied by the noise reduction ventilation cooling device is reduced, and the problem that the noise reduction device and the heat dissipation ventilation facility occupy a large tunnel space in the prior art is solved.

This disclosure provides a wedge and design method for a multipath acoustic attenuation phased array ultrasonic testing probe. The wedge includes a wedge body, multiple silencing grooves, and a damping block. The extension direction, spacing, and depth of each silencing groove are configured such that at least a portion of the reflected transverse wave generated at the detection surface can be guided to an attenuation interface formed by the groove wall of the silencing groove and the damping block. Furthermore, the reflected longitudinal wave generated at the detection surface undergoes at least six interface reflections within the wedge body before returning to the probe direction. The acoustic characteristics of the damping block are configured to absorb the reflected transverse wave. The reflected transverse wave is attenuated at the attenuation interface through a combination of scattering by the silencing groove and absorption by the damping block. After at least six interface reflections, the acoustic component of the reflected longitudinal wave returning to the probe direction forms a 180° phase difference with the incident longitudinal wave emitted by the probe, thus being attenuated through phase interference.

This invention relates to the field of vibration damping and sound-absorbing sheet processing, and more particularly to a fully automated production line for vibration damping and sound-absorbing sheets. The production line includes a sheet feeding device, a stamping device, a straightening device, and a bending device. The sheet feeding device stores the sheet material, transfers it to the stamping device, and moves the sheet material horizontally within the stamping device. The stamping device stamps the sheet material to obtain a blank and transfers the blank to the straightening device. The straightening device detects the flatness of the blank, straightens any bent blanks, and transfers the blank to the bending device. The bending device bends the blank and then sends it out as a finished product. This fully automated production line for vibration damping and sound-absorbing sheets can automatically complete the sheet feeding, stamping, straightening, bending, and blank transfer between processes during the production of vibration damping and sound-absorbing sheets, achieving a high degree of automation.

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.

Noise can be appropriately removed from data having a plurality of values, such as an image, even in a case in which an AI-dedicated chip is used. A noise removal method is a method for removing noise from data having a plurality of values, and includes an acquisition step (S01) of acquiring noise removal target data that has a plurality of values and that is a noise removal target, a first noise generation step (S02) of performing first noise removal processing on the acquired noise removal target data, to generate first noise data related to noise to be removed by the first noise removal processing, a second noise generation step (S03) of inputting the generated first noise data to a learning model generated in advance by machine learning, to generate second noise data, and a noise removal step (S04) of using the generated second noise data, to generate data after noise removal from the noise removal target data.

The utility model relates to the technical field of silencers, and discloses a high temperature resistant pipeline type silencer, which comprises a static pressure box and a sound absorption sheet, the inside of the static pressure box is fixedly connected with a silencing pipe, the inside of the silencing pipe is fixedly connected with the sound absorption sheet, the back surface of the silencing pipe is fixedly connected with a fixing device, the sound absorption sheet comprises a sound absorption body, and the fixing device is fixedly connected with the sound absorption body. The front face and the back face of the sound absorption body are fixedly connected with a flow guide cover, air grooves are formed in the two sides of the interior of the sound absorption body, micro-penetrating holes are formed in the two sides of the sound absorption body, and the micro-penetrating holes are evenly distributed and communicate with the air grooves. Air flow enters the silencer and is separated by the sound absorption sheets, sound enters the air grooves through the micro-perforated holes, the micro-perforated plate where the micro-perforated holes are located and the air grooves form a resonance sound absorption structure, the sound is absorbed, the sound absorption sheets are simple in structure, easy to clean and resistant to high temperature, and the silencer can be used in a high-temperature environment easily.

The invention belongs to the technical field of noise elimination and flame suppression equipment, and particularly discloses a noise elimination and flame suppression device which comprises a noise elimination and flame suppression shell, the noise elimination and flame suppression shell is in a hollow ring shape, the noise elimination and flame suppression shell is filled with a noise elimination and flame suppression agent, and the noise elimination and flame suppression shell can be crushed under the action of high-temperature and high-pressure fuel gas. The two-phase mixed combustion noise reduction and flame reduction technology is adopted, so that the emission noise is greatly reduced, when the initial velocity of a bullet is about 200 m / s, the emission noise can be reduced to 170-175 decibels under the open field condition, the noise can be reduced to 180-185 decibels when the bullet is emitted in a limited space, the emission noise can be remarkably reduced, the sound pressure can be reduced to 1 / 3 of the sound pressure which is not additionally provided with the noise elimination and flame reduction device, and the noise reduction and flame reduction effects are good. After emission, a calcium chloride solution at the emission port and the tail part of an emission object is atomized to wrap flames, so that flame at the emission port and emission tail flames can be obviously reduced, and flame visible to naked eyes basically does not exist; the training clothes can be kept complete when being launched in a limited space, and cannot be burnt out, broken down or ignited by tail flames or post-spraying objects.