41results about How to "Reduce noise reduction costs" patented technology

The invention discloses a noise reduction method, a noise reduction device and a communication terminal which are used for solving the noise interference problem in communication terminal conversation. The noise reduction method comprises controlling a first voice frequency input device to collect noise in an environment where the communication terminal is located; carrying out spectral analysis comparison on the environment noise and pre-stored scene noise in the communication terminal to obtain a comparison result; and according to the comparison result, calling noise reduction parameters corresponding to the environment noise, and according to the noise reduction parameters, separating user sound collected by a second voice frequency input device. The noise reduction method, the noise reduction device and the communication terminal have the advantages that through man-machine interaction, an exclusive button is set, a recording menu is called by triggering the button, a user can record noise in a user-defined mode and set the noise reduction parameters, in a conversation state, the user sound is separated through scene noise identification, conversation quality of the communication terminal is improved, and noise reduction cost of the communication terminal is saved.

The invention discloses an array type muffer, the technical problems to be solved are to advance the silencing ability. The array type muffer is provided with an absorbing body in the tube, wherein the absorbing body is a tube provided with sound absorption material inside, the axis of the tube is arranged along the airflow direction in parallel, and the tube is fixedly arranged in the air pipe through the bracket. Compared with the existing technology, in the same length of the muffer, the absorption surface of the unit cross area is increased, the absorption property is advanced, the noise reduction effect is good, which ensures that in the same noise reduction effect, the length and the volume of the muffer are reduced, the air flow area of the unit cross area is increased, the flow velocity of the absorbing body is reduced, the air noise is reduced, the pressure loss is small, thereby reducing the pressure of the system fan, reducing the cost of the air system. The whole muffer is decomposed into each small absorbing body and the parts for installing the bracket, which is convenient for the transportation and installment.

The invention provides a noise eliminating method based on intelligent home furnishing and a system thereof. The method comprises the following steps: (1) collecting all audio information in a residential environment, (2) classifying the collected audio information according to the frequency and displaying the information to a user, (3) receiving a shielding command of the user and setting a type selected by the user as audio needed to be shielded, and (4) generating an audio signal whose phase is opposite to that of the audio which is needed to be shielded and playing the audio signal to neutralize environmental noise. According to the method and the system, a user selection function is added on the basis of active noise reduction, thus the shielding of natural sound and alarm sound can be prevented, and the healthy life of people can be ensured to a certain extent.

The invention discloses a soft damping plate for vibration absorption and noise reduction. The soft damping plate is prepared from the following raw materials in weight portion: 45 to 50 portions of asphalt as a base stock; and 18 to 20 portions of waste rubber powder, 24 to 31 portions of mud powder and 4 to 5 portions of fine sand which are used as fillers; 2 to 3 portions of polypropylene as a temperature resistant additive; and glass fibre cloth as a tire base adopts. The materials are extruded and molded through heating a stirring machine. The soft damping plate for vibration absorption and noise reduction is prepared through adopting raw materials with wide source and low price and new mixture ratio. Through actual measuration, the wasting factor of the soft damping plate reaches over 0.5; noise can be reduced by over 10 decibels; the effect of vibration absorption and noise reduction belongs to upper intermediate degree; and under the condition of equivalent noise reduction, the cost of the soft damping plate is less than one-third of that of a commercial soft damping plate. The soft damping plate can substantially reduce cost for noise reduction and has good environmental, economic and social benefits. The soft damping plate is applied to vibration control of a fan pipeline in a power plant and other large-scale enterprises, reduces the noise of the pipeline and has remarkable comprehensive benefits.

The invention discloses a design method, structure and application of a perforated sound absorber inside a waste heat boiler. The perforated sound absorber comprises two perforated plates 1 and a liner plate 2. The two perforated plates 1 are attached to the two sides of the liner plate 2 respectively; the two sides, tightly attached to the perforated plates 1, of the linear plate 2 are respectively of a groove type structure, so that sound absorption cavities 3 are formed between the perforated plates 1 and the linear plate 2; liner pipes 4 are arranged in holes in the perforated plates 1. According to the perforated sound absorber inside the waste heat boiler, the perforated plates are provided with the liner pipes and the small holes, the problem that a traditional multi-hole sound absorber material is prone to blocking is effectively solved, the resonance absorber is formed by the sound absorption cavities formed by the perforated plates and the linear plate, noise produced inside the waste heat boiler can be effectively absorbed, and a part of the noise can be reflected to a noise source.

The invention discloses an internal noise source identification method of a waste heat boiler. The method comprises S1, establishing a bare tube two-dimensional model, separately simulating the flow field and the sound field of the bare tubes under two tube arrays of a high-pressure superheater and a deaerating evaporator, calculating segment characteristic frequency and estimating the integral characteristic frequency range inside the boiler; S2, establishing a finned tube finite element model, separately simulating the flow field and the sound field of a single pipe of finned pipes under the two tube arrays of the high-pressure super heater and the deaerating evaporator and calculating segment characteristic frequency to estimate the integral characteristic frequency range inside the boiler; S3, correcting the characteristic frequency of the tube arrays; S4, calculating normal frequency and determining whether to excite the normal frequency to generate sound chamber resonance; S5, calculating the sound transmission losses and the sound insulation of the boiler to be combined with actually-measured data to obtain total boiler internal noise; S6, calculating the contribution of different types of noise to the boiler internal noise to determine the main noise source of the boiler internal noise. The internal noise source identification method of the waste heat boiler can help identify the internal noise source of the waste heat boiler accurately.

The invention discloses a control method and a control device of the internal noise of a waste heat boiler. The method comprises eliminating flow noise due to tube array vortex dropping through a perforated sound absorbing body and reducing transmission of noise from the boiler chamber to a chimney through a resonance silencer, wherein the perforated sound absorbing body is formed by adhering two perforated plates on both sides of a lining plate, and the resonance silencer is composed of double-faced perforated sound absorbing plates and a single-faced sound absorbing structure inside the boiler chamber. According to the control method and device of the internal noise of the waste heat boiler, the resonance silencer has relatively good low-frequency sound absorbing performance, enables noise emitted from a chimney to be provided with noise reduction of 14 dB (A) on a 63 Hz octave frequency belt and enables field noise to fundamentally meet the emission standard; the perforated sound absorbing body can effectively absorb noise generated inside the waste heat boiler and reflect parts of the noise to the noise source. Besides, compared with the prior art, the control method and the device of the internal noise of the waste heat boiler can reduce the noise reduction investment cost by one third.

The invention discloses a method for identifying a noise source in a waste heat boiler. The method comprises the steps that S1, a two-dimensional bare pipe model is established, the flow field and the sound field of bare pipes of two pipe arrays of a high-pressure superheater and a deoxidizing evaporator are respectively calculated in a simulated mode, the sectional characteristic frequency is calculated, and the characteristic frequency range inside the whole boiler is estimated; S2, a finned pipe finite element model is established, the flow field and the sound field of each single finned pipe in the two pipe arrays of the high-pressure superheater and the deoxidizing evaporator are respectively calculated in a simulated mode, the sectional characteristic frequency is calculated, and the characteristic frequency range inside the whole boiler is estimated; S3, the characteristic frequency of the pipe arrays is corrected; S4, the normal frequency is calculated and whether the normal frequency is excited to generate sound cavity resonance or not is judged; S5, sound transmission loss and sound insulation calculation are conducted on the boiler and total noise in the boiler is obtained with the combination of actually-measured noise data; S6, the contribution to the noise in the boiler by different kinds of noise is calculated, and a main source of the noise in the boiler is determined. The method can be used for accurately identifying the source of the noise inside the waste heat boiler of a gas turbine.

A noise reduction type heat dissipation explosion-proof motor disclosed by the present invention comprises a motor casing and a mounting base mounted at the bottom of the motor casing, a stator winding is arranged in the motor casing, the front end of the stator winding is in transmission connection with a first rotating shaft, and the rear end of the stator winding is in transmission connection with a second rotating shaft. The rear end of the second rotating shaft is fixedly sleeved with a fan, a sound insulation plate is installed at the rear end of the stator winding, the sound insulation plate is installed on the inner wall of the motor shell in an embedded mode, and a plurality of heat conduction pipes are annularly installed on the outer side of the sound insulation plate in a penetrating mode and located at the front end of the sound insulation plate. According to the explosion-proof motor, firstly, a combined type shockproof noise reduction structure is adopted, the noise reduction effect of the explosion-proof motor is improved, noise of the explosion-proof motor is reduced, meanwhile, part of noise reduction cost is reduced, secondly, a sealed type air cooling heat dissipation structure is adopted, the cooling and heat dissipation effects are achieved, the sealing protection performance is also improved, and the explosion-proof motor is suitable for being popularized and used. Meanwhile, the damage to the explosion-proof motor is reduced, and the service life is prolonged.

The invention discloses a central air conditioner and a denoising method and device thereof, relates to the technical field of denoising and is intended to reduce denoising cost and enhance denoisingeffect. The method herein includes: allowing a denoising controller to receive a reference noise signal acquired and transmitted by a reference noise sensor in a target denoising module, and receive an error noise signal acquired and transmitted by an error noise sensor in the target denoising module, wherein the target denoising module is nay of at least two denoising modules; the denoising controller processes the reference noise signal of the target denoising module and the corresponding error noise signal so as to acquire a corresponding target denoising signal of the target denoising module; the denoising controller controls a speaker in the corresponding denoising module according to the target denoising signal to output a denoised sound, so that the denoised sound counteracts noiseto be eliminated.

The invention discloses a design method, a structure and application of a resonance silencer for waste heat boiler. The resonance silencer is composed of double-faced perforated sound absorbing plates (1) and a single-faced sound absorbing structure (9) which are arranged inside a boiler chamber. The double-faced perforated sound absorbing plates (1) are arranged inside the boiler chamber side by side and formed by stacking a plurality of double-faced perforated sound absorbing bodies (2) with different resonance frequencies; the single-faced sound absorbing structure (9) is arranged on the inner wall of the waste heat boiler. The resonance silencer has relatively good low-frequency sound absorbing performance, enables noise emitted from a chimney to be provided with noise reduction of 14 dB (A) on a 63 Hz octave frequency belt and enables field noise to fundamentally meet the emission standard. Besides, compared with the prior art, the resonance silencer can reduce the invested noise reduction cost by one third when used for noise reduction of the waste heat boiler.

The embodiment of the invention discloses a sound control method and device based on smart home and a storage medium. The method is suitable for smart equipment. The method comprises the steps that ina noise reduction mode, audio information in a preset sound frequency range in a smart home environment where the smart equipment is positioned is collected; based on the audio information, sound production smart equipment serving as a sound source is determined; and a noise reduction instruction is sent to the sound production smart equipment, so that the sound production smart equipment reducessound based on the noise reduction instruction. Through the embodiment, noise reduction cost can be lowered, and precise noise reduction can be realized. In addition, automatic sound control can be realized based on machine learning, and the noise reduction mode is automatically started based on recognition of a user state or manually started by a user.

The invention discloses an array type muffer, the technical problems to be solved are to advance the silencing ability. The array type muffer is provided with an absorbing body in the tube, wherein the absorbing body is a tube provided with sound absorption material inside, the axis of the tube is arranged along the airflow direction in parallel, and the tube is fixedly arranged in the air pipe through the bracket. Compared with the existing technology, in the same length of the muffer, the absorption surface of the unit cross area is increased, the absorption property is advanced, the noise reduction effect is good, which ensures that in the same noise reduction effect, the length and the volume of the muffer are reduced, the air flow area of the unit cross area is increased, the flow velocity of the absorbing body is reduced, the air noise is reduced, the pressure loss is small, thereby reducing the pressure of the system fan, reducing the cost of the air system. The whole muffer isdecomposed into each small absorbing body and the parts for installing the bracket, which is convenient for the transportation and installment.

The invention provides a method and device for actively reducing noise of a power distribution room based on an analytic hierarchy process, and the method comprises the following steps: separating a primary sound wave, and obtaining a high-frequency sound wave and a low-frequency sound wave; respectively calculating comprehensive scores of active noise reduction of the full wave, the high-frequency sound wave and the low-frequency sound wave, and calculating comprehensive scores when noise reduction is not performed; and outputting a corresponding secondary sound wave according to the result of the comprehensive score. The device comprises a primary sound wave conversion module, a comprehensive scoring module and a secondary sound wave output module. The primary sound wave conversion module is connected with the comprehensive scoring module, and the comprehensive scoring module is further connected with the secondary sound wave output module; and the comprehensive scoring module is internally provided with the analytic hierarchy process. The secondary sound waves are used for offsetting the primary sound waves to achieve active noise reduction, so that the problems that an existingpower distribution room is high in noise reduction cost and unfavorable for equipment heat dissipation are solved.

The invention discloses a breaker noise reduction device. The breaker noise reduction device can reduce noise and reduce environmental noise pollution. The breaker noise reduction device comprises a breaker machine body, the breaker machine body is provided with an inner cavity, and a protective layer, a sound insulation layer and inner wall wear-resisting layers are arranged on the inner wall ofthe inner cavity from outside to inside in sequence. The sound insulation layer is filled with sound absorption materials. A sound insulation cover is arranged above the inner cavity of the breaker machine body, a feeding door is arranged on the sound insulation cover, a sound insulation damping base is arranged below the breaker machine body, and a spring and sound insulation damping devices arearranged between the sound insulation damping base and the breaker machine body. The breaker noise reduction device can effectively reduce the noise generated by a breaker, avoids rearranging noise reduction equipment after the breaker is transferred to a field, and reduces the noise reduction cost; and the noise pollution to the environment can be reduced.

The invention provides an impeller, a fan and an extractor hood, and relates to the technical field of power equipment. The impeller comprises a plurality of blades, and the blades are arranged at intervals in the circumferential direction of the impeller. The curve of each blade is a Bezier curve. Flow channels are formed between every two adjacent blades, and the sectional area of each flow channel is gradually decreased from a flow channel inlet to a flow channel outlet in the radial direction of the impeller. Vortex and flow separation at a blade inlet can be reduced by the blades, so thatinlet air flow is smooth, the phenomenon of flow separation at a blade outlet is reduced to a certain extent, the efficiency of the fan is basically not lost, and the total pressure and flow are improved to a certain extent at the same rotating speed. While the performance is ensured, the flow field condition of the flow channels of the blades is improved, and the noise can be reduced. Accordingto the impeller, the shapes of the blades are optimized through the Bezier curve to achieve noise reduction, the installation modes of the blades do not need to be changed, the structures of the blades do not need to be modified, and the noise reduction cost and the complexity of the machining process can be reduced.

The invention discloses a central air conditioner and a denoising method and device thereof, relates to the technical field of denoising and is intended to reduce denoising cost and enhance denoisingeffect. The method herein includes: allowing a denoising controller to receive a reference noise signal acquired and transmitted by a reference noise sensor in a target denoising module, and receive an error noise signal acquired and transmitted by an error noise sensor in the target denoising module, wherein the target denoising module is nay of at least two denoising modules; the denoising controller processes the reference noise signal of the target denoising module and the corresponding error noise signal so as to acquire a corresponding target denoising signal of the target denoising module; the denoising controller controls a speaker in the corresponding denoising module according to the target denoising signal to output a denoised sound, so that the denoised sound counteracts noiseto be eliminated.

The invention firstly provides an over-limit noise sound source determination method. The method comprises the following steps of: acquiring noise through a sound acquisition device, respectively comparing one or more pieces of acquired noise with standard noise, determining over-limit noise, carrying out octave analysis on the over-limit noise, and determining an over-limit sound source in an obtained noise frequency band. The invention further provides an air conditioner, a vehicle, a noise control method and a noise reduction device. According to the over-limit noise sound source determination method, the air conditioner, the vehicle, the noise control method and the noise reduction device, octave analysis is carried out on the over-limit noise, the over-limit sound source and the frequency of the over-limit sound source are determined, targeted intelligent noise reduction is carried out on the over-limit sound source, and sound quality after noise reduction is improved.

The invention provides a noise reduction device and a noise reduction method for steam pipeline purging. High temperature, high pressure and high speed steam is subjected to noise reduction treatmentthrough a sound attenuation module, the sound attenuation module adopts a compressor, a condenser, a filter and a baffle type evaporator to form the refrigeration cycle, then a sound attenuation cavity is cooled, and finally noise reduction is realized. According to the noise reduction structure, the kinetic energy of the high temperature and high pressure steam blown out from the inner part of apipeline to be purged is recovered, and kinetic energy is converted into the mechanical energy of the compressor to realize cooling and noise reduction, meanwhile, the energy of high temperature and high pressure steam is recycled, environmental protection and energy saving are achieved, the cost of noise reduction is reduced, the effect of noise reduction is better and the efficiency of noise reduction is higher; and on the other hand, sound attenuation baffles can be used for blocking the high temperature, high pressure and high speed steam to form the sound attenuation cavity, so that soundwaves are reflected and interfered at a mutational interface of the cross-sectional area, and sound attenuation are achieved.

The invention discloses a double-microphone voice noise reduction device. The device comprises a first microphone and a second microphone, wherein the first microphone and the second microphone are located on the same horizontal line, the first microphone is set to be in the 0-degree direction of the mouth, the second microphone is far away from the 180-degree direction of the mouth, and the distance between the first microphone and the second microphone ranges from 1.1cm to 3cm. The invention also discloses a double-microphone voice noise reduction method, which comprises the steps of firstly, receiving and acquiring two paths of voice signals s0 and s1, wherein the sampling rate is integral multiple of the sampling rate of actually processed data; then down-sampling to an actual samplingrate needing to be processed; performing spectral analysis on the down-sampled data, and iteratively calculating a filter coefficient; multiplying the filter by one path of input signal in a frequency domain, and performing inverse Fourier transform and overlapping addition to obtain an output voice signal s2. According to the invention, stable and non-stable voices in a non-target direction canbe effectively filtered to obtain processed clean voices; not only can an efficient noise reduction effect be achieved, but also the noise reduction cost is reduced.

The invention discloses a full-automatic intelligent polishing machine. The rotating transposition mechanism is arranged in the middle of the rack and used for switching stations, and the bearing positioning devices are installed on the rotating transposition mechanism in a circumferential mode and used for fixing workpieces. The gas distribution module and the power distribution module are arranged in the middle of the rotary transposition mechanism; and the polishing manipulators are arranged at the upper end of the rack and used for machining workpieces on the bearing and positioning device. The multiple bearing and positioning devices are evenly arranged on the rotary transposition mechanism in the circumferential direction, the multiple polishing manipulators used for machining the workpieces are arranged above the rotary transposition mechanism, the rotary transposition mechanism drives the bearing and positioning devices to be switched between the polishing manipulators, and machining of the workpieces in different procedures is completed through the different polishing manipulators; and the workpiece or the polishing disc does not need to be disassembled and assembled repeatedly, so that errors caused by clamping are reduced, and the machining precision is improved.

The invention provides an air volume adjusting device and method of an alternating current fan and air draft equipment. The air volume adjusting device comprises a first controller, a fan driving circuit and a capacitor switching circuit. The first controller is connected to the capacitance switching circuit, and the capacitance switching circuit is connected to the alternating current fan; the first controller is connected to the fan driving circuit, and the alternating current fan is connected to the fan driving circuit; and the fan driving circuit, the capacitance switching circuit, the alternating current fan and the first controller are respectively connected to the power supply circuit. Therefore, by arranging the first-stage air volume gear and the refined second-stage air volume gear under the first-stage air volume gear, refined adjustment of the air volume can be achieved, and the personalized adjustment requirements of different users are fully met; noise generated by the range hood is changed by adjusting the air volume, resonance points do not need to be calibrated in advance, redundant assemblies do not need to be installed, the range hood is suitable for differences of different installation environments, the noise reduction cost is low, and the noise reduction mode is reliable.

The invention discloses a water pan for an evaporator of an air cooling refrigerator. The lower part of a water pan body nearby a connecting part is provided with a buffer area used for reducing the noise when the water pan is deformed by thermal expansion; a deformed part of the water pan can be functioned on the buffer area due to the function of the buffer area when the water pan is deformed through thermal expansion, and the buffer area is stretched and compressed by the applied force of the deformation so as to buffer the applied force of the deformation, therefore, the vibrating noise in the process of deforming can be prevented or reduced, the noise reduction cost is lower, the effect is better, the sleeping quality of the user can be guaranteed, and the quality of daily life of the user can be improved; and the water pan is simple in structure and convenient to install.

The invention discloses a bullet train converter noise reduction design method based on reactive noise elimination. The method is characterized by comprising steps: 1) obtaining the noise frequency and the noise value of a converter, 2) determining the maximum reactive noise elimination frequency, 3) determining the length of an expansion chamber of the target reactive silencer according to the maximum reactive noise elimination frequency, and determining the expansion ratio of the target reactive silencer according to the noise elimination amount, and 4) determining the target reactive silencer according to the expansion ratio of the target reactive silencer and the length of the expansion chamber, and installing the target reactive silencer in the air duct of the converter. The method can effectively reduce the low and medium frequency noise generated by a fan, and realizes the active noise reduction of the converter.

The present application discloses an automatic parking method, a device and a storage medium. The method includes: acquiring a pressure value of a brake pedal of the vehicle during the driving process of the vehicle; when the pressure value of the brake pedal is greater than zero, judging the vehicle Whether the automatic parking conditions are met; when the vehicle meets the automatic parking conditions, the activation threshold of the automatic parking equipment is determined based on the slope information and weight information corresponding to the vehicle; when the pressure value of the brake pedal is greater than the activation threshold of the automatic parking equipment When , start the automatic parking equipment; set the brake pressure value of the automatic parking equipment to the pressure value of the brake pedal; apply the braking pressure to the wheels of the vehicle through the automatic parking equipment, so that the vehicle is in a stationary state; In the present application, the pressure of the brake pedal is set as the braking pressure of the automatic parking equipment, so as to realize the pressure maintenance, thereby avoiding the noise and pedal vibration caused by the automatic pressure build-up or pressure release of the parking equipment.

The embodiment of the invention discloses a rotor wing thickness noise control method based on variable area resistance sheets and relates to the technical field of aeroacoustics. Rotor wing thickness noise can be remarkably reduced in a targeted mode. The method comprises the steps that the rotor wing size and flight parameters are read, and rotor wing thickness noise P'T in a given flight state is calculated; a control force F is exerted at the quarter chord wire position of the end of each blade, and control source noise p'F produced by the control force F in the given flight state is calculated; according to a rotor wing thickness noise reducing target, an offset factor f is set, and the control force F exerted at the quarter chord wire position of the end of each blade is calculated; the variable area resistance sheet is added at the quarter chord wire position of the end of each blade, the area and control force relations of different resistance sheets are calculated based on a CFD method, and the area of the resistance sheet at the quarter chord wire position of the end of each blade is obtained; the spanwise distribution positions of the control forces are changed, and the areas of the resistance sheets at different positions are calculated; the resistance sheets with corresponding areas are added at the different positions of the blades.

The invention discloses a method and a system for lowering rotor wing noise on the basis of a trailing edge flap. The method comprises the following steps that: obtaining the rotor wing parameter andthe working parameter of a helicopter; obtaining a first rotor wing thickness noise characteristic on an observation point; obtaining a plurality of second rotor wing thickness noise characteristics on the observation point; determining a target function, wherein the target function is a function which enables the area of a denoising region of the observation point to be maximum; according to thetarget function, determining the distribution position of applied external force; according to a sound field compensation method, determining the numerical value of the external force; adopting a CFD(Computational Fluid Dynamics) numerical value simulation method to determine a function relationship between the deflection parameter and the external force of the trailing edge flap; according to the function relationship between the deflection parameter and the external force and the numerical value of the external force, determining the deflection parameter of the trailing edge flap of the distribution position; and according to the deflection parameter of the trailing edge flap, regulating the deflection of the trailing edge flap on the distribution position so as to lower the rotor wingnoise of the helicopter. By use of the method and the system provided by the invention, the area of the denoising region of the rotor wing thickness noise can be obviously increased, and a denoising effect is improved.

This application is applicable to the field of magnetic resonance technology, and provides a magnetic resonance parameter imaging method and equipment based on gradient waveform adjustment, wherein, a magnetic resonance parameter imaging method based on gradient waveform adjustment obtains preset scan sequence parameters and control parameters, according to the scan sequence parameters and control parameters, the target area value of the gradient waveform of the signal to be adjusted can be determined, wherein the gradient waveform of the signal to be adjusted includes a platform band and a gradual band, and the gradient waveform of the signal to be adjusted is adjusted according to the preset amplitude adjustment parameters Based on the waveform amplitude of the platform band, and then based on the target area value and the first area value of the new platform band, the gradient band is smoothly adjusted to obtain a new gradient band, which reduces the drop of the signal inflection point represented by the original gradient band. The noise generated during the gradient field switching process is collected, and then the noise reduction operation is performed by matching the corresponding noise reduction signal, which simplifies the noise reduction scheme and saves the cost of noise reduction.