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51 results about "Acoustic pollution" patented technology
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Sound pollution surveillance system and method
A system for detecting a sound level of vehicles comprising sensor units for detecting vehicles on a road and for measuring a sound level of a detected vehicle. A data processing unit is connected to the sensor units and has an identification recorder for operating the system by recording an identification of the vehicle detected if the sound level is above a given value.
Owner:SETI MEDIA
Design method for linear active-disturbance-rejection controller based on prediction tracking differentiator
ActiveCN108873704AImprove robustnessSuppression of phase delay phenomenonAdaptive controlDifferentiatorClosed loop
The invention relates to a design method for a linear active-disturbance-rejection controller based on a prediction tracking differentiator, and the method comprises the following steps: a, designingthe prediction tracking differentiator, and performing the filtering of an obtained state signal through the prediction tracking differentiator to obtain a filter value; b, obtaining an extension state of the system through an extension state observer based on the filter value; c, correcting a PD control law through the extension state to obtain the linear active-disturbance-rejection controller.The method provided by the invention can inhibit the impact on the closed-loop characteristics of a system from the noise pollution, can effectively inhibit the phase delay phenomenon caused by the filtering, solves a problem of noise pollution amplification caused by a high-gain observer, and improves the robustness of a controller. The method improves the robustness of the active-disturbance-rejection controller to the high-frequency noise, and has the engineering practicality.
Owner:BEIJING SPACE TECH RES & TEST CENT
Superposed assembly type structure subway station and assembly construction method thereof
PendingCN111456088AImprove pouring qualityImprove self-waterproof qualityArtificial islandsProtective foundationReinforced concreteArchitectural engineering
The invention relates to a superposed assembly type structure subway station and an assembly construction method thereof. At present, when the station construction is carried out, a large number of formworks are needed, the field operation amount is large, and the construction period is long; environmental water pollution, noise pollution and air pollution can also be caused by the cast-in-place wetting operation, the superposed assembly type structure subway station comprises a top plate (1), a middle plate (2), a bottom plate (3), a heat exhaust air duct (5) and a side wall (4), and is characterized in that a construction joint from the bottom plate to the bottom of a negative second layer is of a cast-in-place reinforced concrete structure, and an exposed grouting sleeve is pre-buried at the construction joint and is connected with an upper side wall stress steel bar; the side wall inner skin is a precast block with truss bars and serves as an inner side formwork at the same time, the bottom of the side wall inner skin is inserted into the grouting sleeve, the stress steel bars are connected by pouring efficient grouting materials, a cast-in-place belt is arranged on the construction joint, side wall cavity concrete is poured, and a side wall overlapping structure is formed. The method thereof is applied to the field of subway construction.
Owner:CCCC FIRST HARBOR ENG +2
Supporting noise reduction system for combustion gas turbine mobile power station
ActiveCN111550314AEasy to moveImprove the noise reduction effectGas turbine plantsJet propulsion plantsPower stationNoise
The invention discloses a supporting noise reduction system for a combustion gas turbine mobile power station, and relates to the technical field of prevention of noise pollution. The system comprisesa sound insulation box body used for mounting a combustion gas turbine, wherein the bottom of the sound insulation body is fixedly mounted on a suspending body frame through a sound attenuation system underframe, and wheels are mounted at the bottom of the suspending body frame; an inlet gas sound attenuation system is connected to one end of the sound insulation box body, and an intake air soundattenuation system is arranged above the inlet gas sound attenuation system and communicates with a gas inlet of the sound insulation box body; and a first-stage exhaust sound attenuation system is arranged at the top of the other end of the sound insulation box body, a second-stage exhaust sound attenuation system is mounted at the top of the first-stage exhaust sound attenuation system, and thefirst-stage exhaust sound attenuation communicates with an exhaust port of the sound insulation box body. According to the supporting noise reduction system for the combustion gas turbine mobile power station, noise produced by the combustion gas turbine during working is reduced, and the working environment is protected.
Owner:HARBIN CHENGLIN TECH
Transformer device with noise reduction function
InactiveCN107424745ABlock the transmission pathReduce sound pollutionTransformers/reacts mounting/support/suspensionTransformers/inductances noise dampingFiberPolyester
The invention relates to the technical field of noise reduction devices, in particular to a transformer device with a noise reduction function, which includes a noise reduction cover, a tension spring fixedly connected to the middle of the cross bar, a ring-shaped limit plate in the middle of the air pipe, and a tension spring The upper end is fixedly connected with a small sound-absorbing board, which is located above the ring-shaped limiting board, and the guide groove is movably connected with the slider. There are fixing bolts threaded between the large sound-absorbing panels, and a card slot matching the polyester fiber folding panels is opened at the position where the large sound-absorbing panels contact the polyester fiber folding panels, and the sound-insulating room is filled with sound-absorbing cotton. The transformer device with noise reduction function can absorb the noise generated by the transformer, block the propagation path of the noise, weaken the noise in the working environment, reduce the sound pollution of the working environment, and ensure the hearing health of the staff.
Owner:CHENGDU FEIHANG PEIPENG TECH CO LTD
Novel efficient ultrasonic cleaning machine
PendingCN110834009AEfficient removalAdjust cleaning heightCleaning using liquidsMegasonic cleaningEngineering
The invention discloses a novel efficient ultrasonic cleaning machine and belongs to the technical field of ultrasonic cleaning. Conical small holes are uniformly distributed in the inner wall of an outer bin body, and the noise pollution is reduced effectively. A certain included angle is formed between each inner cavity bottom plate and the corresponding side plate, a pyramid-like type is adopted, ultrasonic energy can be aggregated, and the energy utilization rate is increased; sixteen ultrasonic transducers are arranged on the outer side of the bottom of the inner cavity and are connectedin parallel, and the power of the ultrasonic cleaning machine is changed in real time; a screen frame is arranged on a bottom groove of the inner cavity, residues can be cleaned at any time, and cleaning liquid does not need to be replaced; a drainage port is formed in the inner cavity bottom groove, and a stainless steel net rack is arranged in the inner cavity; and a guide rail type moving device for driving the stainless steel net rack is arranged on the inner side wall of the inner cavity, so that the stainless steel net rack can be driven to move up and down, and height adjustment of cleaning workpieces is achieved. By means of the novel efficient ultrasonic cleaning machine, the cleaning work of the cleaned workpieces can be efficiently completed, meanwhile, noise pollution is reduced, and applicability and practicability are higher.
Owner:TIANJIN UNIV OF SCI & TECH
Public broadcasting sound pressure self-adaptation control method
The invention relates to a public broadcasting sound pressure self-adaptation control method. Through a magnitude squared coherence (MSC) function, the coherence of site sound signals and broadcast source frequency spectrums is computed, an obtained MSC coefficient is used as an MSC signal-to-noise ratio representation value to indirectly represent the site signal-to-noise ratio, and accordingly public broadcasting sound pressure is adjusted in a self-adaptation mode. According to the public broadcasting sound pressure self-adaptation control method, the MSC function is used for estimating the coherence of the site sound signals and the broadcast frequency spectrums, so that the site signal to noise ratio (SNR) information is obtained, under the condition that sound pollution is not increased, after sound pressure level adjusting, site mixed signals are obviously clearer than original site mixed signals, and broadcast content can be clearly heard.
Owner:GUANGZHOU UNIVERSITY
Rail transit steel-concrete composite beam with sound insulation function
PendingCN112921784AIncrease heightImprove mechanical propertiesBridge structural detailsBridge erection/assemblyBridge deckCross bridge
The invention relates to a rail transit steel-concrete composite beam with a sound insulation function, and relates to the technical field of bridge construction; the rail transit steel-concrete composite beam comprises a steel-concrete bridge deck slab, two steel main beams and a plurality of transverse supports; the two steel main beams are arranged on the two sides of the steel-concrete bridge deck slab respectively in the cross bridge direction, and the bottom ends of the steel main beams are connected with the steel-concrete bridge deck slab; and the plurality of transverse supports are arranged at intervals in the longitudinal bridge direction, the two ends of each transverse support are connected to the top ends of the two steel main beams respectively, and the transverse supports, the steel-concrete bridge deck slab and the steel main beams jointly define a sound insulation cavity. According to the steel-concrete composite beam, the mechanical property advantages of the two materials are exerted, the structural bearing capacity and flexural rigidity are enhanced, the problem that a bridge deck slab in a hogging moment area cracks is solved, when a vehicle travels in the sound insulation cavity, propagation of wheel track noise can be effectively isolated, and train operation sound pollution is reduced. And meanwhile, the steel structure can be subjected to factory prefabrication, the construction quality is guaranteed, and the construction efficiency is correspondingly improved.
Owner:CHINA MAJOR BRIDGE ENERGINEERING
Low-noise transformer oil tank
PendingCN112750595AReduce deliveryDoes not affect shapeTransformers/inductances coolingTransformers/inductances casingsLow noiseEngineering
The invention provides a low-noise transformer oil tank. The oil tank comprises an oil tank inner wall, an oil tank outer wall and a noise reduction interlayer arranged between the oil tank inner wall and the oil tank outer wall, wherein the noise reduction interlayer comprises an interlayer structure used for transmitting noise vibration energy and mass blocks located on the two sides of the interlayer structure, and the mass block is used for converting and consuming noise energy so as to reduce noise pollution. The oil tank can reduce outward propagation of sound waves, reduces noise transmitted by the tank wall of the oil-immersed transformer, is low in cost, does not affect the overall appearance shape of the tank wall, and can be used for a long time without maintenance.
Owner:CHINA ELECTRIC POWER RES INST +2
Mobile terminal high-precision distance and speed estimation method and system based on sound
PendingCN113329360AHigh precisionReduce computational complexitySynchronisation arrangementParticular environment based servicesSound sourcesFrequency spectrum
The invention provides a mobile terminal high-precision distance and speed estimation method and system based on sound. The method comprises the following steps of: acquiring a composite hyperbolic frequency modulation signal; performing time delay estimation on hyperbolic frequency-modulated signals of two different frequency bands of the composite hyperbolic frequency-modulated signal at the same time to respectively obtain time delay estimation values of the hyperbolic frequency-modulated signals of the two different frequency bands, resolving to obtain a Doppler factor and a time delay estimation value of the composite hyperbolic frequency-modulated signal, and calculating a distance estimation value and a speed estimation value according to the Doppler factor and the time delay estimation value of the composite hyperbolic frequency modulation signal. The prior information of a sound source signal is used as a reference signal, and the distance and speed information can be obtained at the same time only through two times of generalized cross-correlation or two matched filters, so that spectrum leakage is effectively inhibited, sound pollution is avoided, the signal-to-noise ratio of the signal is effectively ensured, the estimation accuracy and calculation complexity can meet the indoor positioning system requirements for the intelligent mobile terminal, and the mobile terminal high-precision distance and speed estimation method and system have good application and popularization values.
Owner:CHANGAN UNIV
Concrete dam deformation combined forecasting model construction method based on ARIMA and PSO-ELM
ActiveCN112100711AImprove forecast accuracyAvoid noise disturbanceGeometric CADArtificial lifeHidden layerSwarm algorithms
The invention provides a concrete dam deformation combined forecasting model construction method based on ARIMA and PSO-ELM, and aims at the characteristics of high nonlinearity and uncertainty causedby mutual influence of multiple factors in the dam deformation process, irregular chaotic characteristics caused by complex noise pollution and the like. An ensemble empirical mode (EEMD) is used tocarry out adaptive analysis and processing on a residual sequence of a displacement hybrid model, a particle swarm optimization (PSO) algorithm is used to optimize ELM and select an optimal input weight matrix and hidden layer deviation, and a PSOELM model is constructed to optimize a nonlinear high-frequency induction signal of the PSOELM model; meanwhile, fitting prediction is carried out on a low-frequency trend signal by means of an autoregressive integral moving average model (ARIMA), and a multi-scale deformation optimization combination forecasting model is established. Compared with atraditional model, the built model is higher in prediction precision, noise interference in the monitoring sequence can be overcome, the multi-scale characteristic of the dam monitoring sequence can be reflected, and the dam monitoring data time sequence can be analyzed and judged more clearly and comprehensively.
Owner:NANCHANG UNIV
Noise reduction type cooling tower additionally provided with air inlet and outlet silencers
PendingCN107036457AReduce noiseReduce noise pollutionSound producing devicesTrickle coolersThermodynamicsCooling tower
The invention discloses a noise reduction type cooling tower additionally provided with air inlet and outlet silencers. The cooling tower comprises a shell, a filling structure, a spraying structure and an air suction structure. The shell is provided with an air inlet and an air outlet. The air inlet communicates with the air outlet. The air suction structure, the spraying structure and the filling structure are contained and fixed in the shell. The spraying structure is fixed to the filling structure so that spraying can sufficiently cover the filling structure. Air is sucked in from the air inlet through the air suction structure, cooled through the filling structure and exhausted by the air outlet. The noise reduction type cooling tower additionally provided with the air inlet and outlet silencers further comprises a first silencing structure and a second silencing structure. The first silencing structure is fixed to the air inlet, and the second silencing structure is fixed to the air outlet so as to reduce noise. The first silencing structure and the second silencing structure are arranged on the air inlet and the air outlet to reduce the overall noise, noise pollution is reduced, and the working environment is improved.
Owner:GUANGZHOU LAXUN TECH DEV CO LTD
Method for managing pinking in a controlled-ignition internal combustion engine
ActiveUS20200003136A1Cancel noiseReduce impactElectrical controlMachines/enginesBandpass filteringNoise
A method for managing knock in a cylinder of an internal combustion engine, in a system including at least one acoustic sensor and a processor, in order to take into account acoustic pollution resulting from a noise, the method including: forming and digitizing the signals of the acoustic sensor, applying a bandpass filter to obtain a filtered noise, determining an adjustable gain-correction function using a gain-correction curve and, depending on the angular position of the end of injection, the point on the gain-correction curve to be used to convert the filtered noise into a corrected knock score, comparing a corrected knock score thus obtained to a knock decision threshold, to correct the timing advance, the gain-correction curve being defined by a calibration value and four angular points obtained by calculation based on the start and end positions of a knock-observation window and on a known characteristic of the noise.
Owner:VITESCO TECH GERMANY GMBH
An Urban Road Noise Prediction System Based on Internet of Things and Cloud Computing Technology
ActiveCN113421422BTime unityReal-time observation of real-time impactDetection of traffic movementRadio-controlled time-piecesData connectionEnvironmental noise
The present invention provides an urban road noise prediction system based on the Internet of Things and cloud computing technology. The system realizes real-time prediction of road environmental noise and predicts the impact of the noise level on urban residents through the Internet of Things and cloud computing technology. Population ratio thereby realizes the noise pollution control to road; Described system comprises: real-time data collection platform, data processing platform and road management platform; Described real-time data collection platform is respectively connected with described data processing platform, road management platform data; The purpose of the present invention is to solve the current environmental problem of urban road noise pollution, and reduce or prevent urban residents from being exposed to the noise environment to cause harmful effects by means of detection and prediction.
Owner:四川三元环境治理股份有限公司
Device for reducing noise pollution and equipment including such device
ActiveUS20110226546A1Reduce additionalReduce noise pollutionCeilingsSound proofingClassical mechanicsEngineering
A device for reducing noise pollution includes an acoustic panel (1) and at least one member (3) for elastically holding the panel (1). This holding member (3) includes:first and second mounting elements (8) for installing the same between a support (2) and panel (1),a spring portion (6) provided between the first and second mounting elements,a tab (7) having one end connected to the second mounting element (5) and bearing, at a distance from the end, the first mounting element (8) so that movement (D) of the acoustic panel (1) perpendicularly to the main faces (14A, 14B) thereof is permitted by an elastic deformation of the spring portion (6) in the tilting direction of the tab (7) relative to the second mounting element (5).
Owner:AE2S
Method for managing pinking in a controlled-ignition internal combustion engine
ActiveUS10871113B2Reduce impactNo impact on dispersion/score ratioElectrical controlMachines/enginesBandpass filteringNoise
A method for managing knock in a cylinder of an internal combustion engine, in a system including at least one acoustic sensor and a processor, in order to take into account acoustic pollution resulting from a noise, the method including: forming and digitizing the signals of the acoustic sensor, applying a bandpass filter to obtain a filtered noise, determining an adjustable gain-correction function using a gain-correction curve and, depending on the angular position of the end of injection, the point on the gain-correction curve to be used to convert the filtered noise into a corrected knock score, comparing a corrected knock score thus obtained to a knock decision threshold, to correct the timing advance, the gain-correction curve being defined by a calibration value and four angular points obtained by calculation based on the start and end positions of a knock-observation window and on a known characteristic of the noise.
Owner:VITESCO TECH GERMANY GMBH
Intelligent control system power generation device
InactiveCN112260467AImprove thermal conductivityIncreased convection coolingSupports/enclosures/casingsEngineeringNoise reduction
The invention discloses an intelligent control system power generation device, which comprises a power generator, a handle is fixedly installed on the outer surface of the top of the power generator,an oil conveying pipeline is fixedly installed on the outer surface of the top of the power generator, a rotary knob cover is arranged above the oil conveying pipeline, and an external thread is formed in the outer wall of the top end of the oil conveying pipeline, an internal thread is formed in the inner wall of the rotary knob cover, the rotary knob cover is in threaded connection with the oilconveying pipeline, a power transmission line is fixedly connected to one side of the power generator, and a plug is fixedly installed at the end, away from the power generator, of the power transmission line. The intelligent control system power generation device is provided with silencing plates, heat conduction plates, wing-shaped bolts and heat dissipation pipes, has excellent silencing and noise reduction capacity, reduces sound pollution brought by the power generator, has excellent heat dissipation capacity, can also facilitate maintenance of the internal structure of the power generator, and brings better use prospects.
Owner:西安永宁达自动化技术有限公司
Inner container with noise reduction structure and dish-washing machine
InactiveCN112353340ASimple structureImprove noiseTableware washing/rinsing machine detailsNoiseEngineering
The invention discloses an inner container with a noise reduction structure and a dish-washing machine. The inner container comprises a box body and further comprises a noise reduction device and a sound transmission component, wherein a plurality of through holes are formed in the side wall of the box body, the noise reduction device is arranged on the outer wall of the box body, the sound transmission component is arranged between the box body and the noise reduction device and covers the plurality of through holes, and the noise reduction device corresponds to the through holes so as to enable noise in the box body to be transmitted outwards after sequentially passing through the through holes, the sound transmission component and the noise reduction device. The structure is simple, thenoise problem of the inner container can be effectively solved, and then noise pollution is effectively reduced.
Owner:VATTI CORP LTD
Preparation method of material composition for effectively relieving noise pollution
The invention provides a preparation method of a material composition for effectively relieving noise pollution. The preparation method is characterized by comprising the following steps: a) ultrahigh molecular weight polyethylene powder, a poring agent and a sound insulation medium are mixed to obtain a mixture; the weight ratio of the ultrahigh molecular weight polyethylene powder to the poring agent and to the sound insulation medium is 100-300: 50-100: 100-150; and the sound insulation medium is one or several of modified zeolite, activated attapulgite, modified diatomite, coke powder, pumice powder and montmorillonite powder; and b) the mixture obtained in the step a) is pressed, sintered and cooled in a mold; the pressing pressure is 0.4-1 MPa; the sintering temperature is 200-250 DEG C; the sintering time is 60-120 min; and the cooling temperature is 40-60 DEG C. The prepared material composition can preferably relieve the harm of the noise pollution to people.
Owner:广州市康水科技有限责任公司
Method, device, equipment and storage medium for purifying axis track of rotating machinery
ActiveCN113340640BAccurate purificationReduce the effects of noiseStructural/machines measurementComplex mathematical operationsTime domainHarmonic wavelets
The invention discloses a method, device, equipment and storage medium for purifying the shaft center track of a rotating machine, which solves the problem of inaccurate purification of the shaft center track caused by signal denoising only in the existing rotor shaft center track purification method; Obtain the vibration signal during the operation of the rotating machinery for harmonic wavelet decomposition to obtain the time-domain characteristics of the vibration signal, and eliminate the influence of noise in the axis track signal; and correct the time-domain characteristics of the vibration signal according to the rotational speed information of the rotating machinery, Extract the time-domain characteristics of the vibration signal corresponding to the rotational speed information of the rotating machinery from the time-domain characteristics of the vibration signal, further filter the noise in the axis track signal, eliminate the interference of complex noise pollution and non-stationary components caused by faults, and accurately The center track of the rotating shaft is purified, and at the same time, the influence of the bandwidth of the frequency band and the constant amplitude of the harmonic wavelet decomposition on the signal reconstruction is reduced.
Owner:格创东智(深圳)科技有限公司
Array truncated conical shell bubble curtain underwater piling noise reduction device
ActiveCN110512604BMake full use of noise reductionSimple and durable structureSound producing devicesBulkheads/pilesSound energyLow frequency band
The invention belongs to the field of marine engineering vibration and noise, and provides an array truncated conical shell bubble curtain underwater piling noise reduction device, which includes a truncated conical shell, inner and outer ring pipes containing air holes, inner and outer standpipes, and an external air compressor , the truncated conical shell is connected with the inner and outer ring pipes through hooks, the inner and outer ring pipes are fixedly connected with the inner and outer vertical pipes through threaded four-way pipes, and the external air compressor is located in the whole The top of the structure is connected to the uppermost ends of the inner and outer vertical pipes through flexible pipes. The device of the present invention guides the propagation of sound waves obliquely through the conical shell in the low frequency band, effectively directional radiates sound waves with longer wavelengths, utilizes the irregularity of sea surface waves, and increases the sound wave propagation path to transmit and consume sound energy to the sea surface of the far sea; In the mid-to-high frequency band, the double-layer bubble curtain produced by the air holes along the inner and outer sides of the conical shell performs resonance absorption and diffuse scattering, effectively reducing noise pollution.
Owner:WUHAN UNIV OF TECH
Silencing device
PendingCN114109561ALengthen and change coursePlay a role in silencerExhaust apparatusSilencing apparatusEngineeringAnechoic chamber
The invention discloses a silencing device, and belongs to the technical field of silencers. The invention aims to process and reduce noise generated by an engine and reduce noise pollution. According to the technical scheme, the silencing device comprises an outer shell, and a first partition plate, a second partition plate, a third partition plate, a fourth partition plate and a fifth partition plate are sequentially arranged between one end and the other end in the outer shell to divide the interior of the outer shell into a first silencing chamber, a second silencing chamber, a third silencing chamber, a fourth silencing chamber, a fifth silencing chamber and a sixth silencing chamber; an air inlet is formed in the outer shell of the third anechoic chamber, and an air outlet is formed in the outer shell of the sixth anechoic chamber.
Owner:中科灵动航空科技成都有限公司
Gain Adaptive Control Method for Sound Reinforcement System
ActiveCN108632711BSolve the problem of fixed playback volumeThe signal-to-noise ratio of the sound reinforcement site is constantSignal processingTransducer circuitsSound sourcesNoise
Owner:GUANGZHOU UNIVERSITY
Multi-net foldable underwater piling noise reduction device and implementation method
ActiveCN112081105BReduce noise pollutionImprove impactBulkheads/pilesMarine engineeringElectric machinery
The invention discloses a multi-net type foldable underwater piling noise reduction device and its implementation method, including a fixing device, a power and data feedback device, a telescopic lifting net cage and a control device. The power and data feedback device can be detachably set on the pile foundation on the lower side of the fixing device, and the power and data feedback device can be detachably connected with the telescopic lifting net cage. Each layer of the multi-layer net curtain is equipped with a vertical lifting rod vertically. The power and data feedback device includes an infrared receiver, a battery motor and a Bluetooth signal device. The battery motor drives the horizontal telescopic rod or the vertical telescopic rod according to the signal received from the control device. The Bluetooth signal device collects the noise from the acoustic sensor on the horizontal telescopic rod and feeds it back to the control device. The invention can be used for underwater noise reduction of piling, in order to reduce noise pollution of marine environment.
Owner:HOHAI UNIV
Shock absorption and noise reduction mechanism of water feeding pump
ActiveCN114109925AReduce noisePlay the role of cushioning and shock absorptionPump componentsPumpsSound waveNoise reduction
The invention relates to a shock absorption and noise reduction mechanism of a water feeding pump, and belongs to the technical field of water pumps, the shock absorption and noise reduction mechanism comprises a shell arranged on a pump body in a sleeving mode, a through hole allowing a water receiving pipe to penetrate out is formed in the shell, and a sound insulation assembly used for stopping sound waves generated by the pump body from diffusing is arranged in the shell; a base is arranged below the pump body, and a damping assembly for buffering and damping the pump body is arranged between the pump body and the base; the shell is installed on the base. The method has the effect of reducing sound pollution caused by the water pump.
Owner:天津国能津能热电有限公司
Vibration and noise reduction compaction table
PendingCN112855842AReliable vibration and noise reductionWeight increaseVibration suppression adjustmentsClassical mechanicsNoise
The invention discloses a vibration and noise reduction compaction table, and belongs to the technical field of environmental governance. The vibration and noise reduction compaction table comprises a compaction platform used for bearing a compaction device and a material to be vibrated, and further comprises a two-stage vibration reduction assembly, a sound insulation cover assembly and a counterweight table. One end of the counterweight table is fixedly connected with the compaction platform, the other end of the counterweight table is fixedly connected with the two-stage vibration reduction assembly, and the compaction platform, the two-stage vibration reduction assembly and the counterweight table are all wrapped by the sound insulation cover assembly. When the compaction platform is stressed to vibrate, the two-stage vibration reduction assembly can buffer acting force transmitted by the compaction platform through the counterweight table. The sound insulation cover assembly can obstruct noise generated by stress vibration of the compaction platform so as to realize vibration and noise reduction. According to the vibration and noise reduction compaction table, a noise reduction mechanism composed of the two-stage vibration reduction assembly, the sound insulation cover assembly and the counterweight table is adopted, the compaction table can carry out vibration and noise reduction reliably, noise pollution is reduced, and the noise influence range is widened.
Owner:厦门兑泰新材料科技有限公司
Anti-stacking auxiliary equipment for express sorting in electronic commerce
InactiveCN112794039APlay a protective effectImprove transmission efficiencyCleaningSortingTransmission beltStructural engineering
The invention relates to the technical field of express sorting auxiliary equipment, in particular to anti-stacking auxiliary equipment for express sorting in electronic commerce. The anti-stacking auxiliary equipment comprises an equipment main body, a fixed plate is fixedly connected in the equipment main body, and an electromagnet is fixedly connected to the top surface in the fixed plate; a compression spring is fixedly connected to the position, located on the left side of the fixing plate, in the equipment body; and a transmission rod is fixedly connected to the lower end of the compression spring, a rotating disc is rotatably connected to the interior of the equipment body, and a positioning sliding rail is fixedly connected to the interior of the rotating disc. According to the anti-stacking auxiliary equipment, an express box is moved to the middle of a conveyor belt through a moving plate, so that contact with a protective fence due to inertia influence is avoided, blockage is avoided, and the rapid box conveying efficiency can be well improved; and the protective liquid in the plastic air cushion is extruded and discharged so that an equipment rotating shaft can be well lubricated and protected, and therefore sound pollution of equipment to the environment can be well avoided.
Owner:朱清明
Movable noise reduction equipment for factory machining and noise reduction method
PendingCN112676904AEffective partitionKeep healthyMaintainance and safety accessoriesElectric machineEngineering
The invention discloses movable noise reduction equipment for factory machining and a noise reduction method. The movable noise reduction equipment comprises a bottom plate, brake wheels are arranged at the four corners of the bottom of the bottom plate, a battery box is installed at one end of the outer wall of the top of the bottom plate, a storage battery pack is arranged in the battery box, a supporting plate is welded to the outer wall of the top of the bottom plate, and a top plate is welded to the outer wall of the top of the supporting plate. A self-locking motor is installed at one end of the top outer wall of the top plate, an output shaft of the self-locking motor is sleeved with a winch, a fixed pulley is installed at the other end of the top outer wall of the top plate, and a steel wire rope is wound around the winch. According to the movable noise reduction equipment for factory machining and the noise reduction method, by arranging the brake wheels at the four corners of the bottom of the bottom plate, the whole equipment is convenient to move and transfer and high in applicability, noise generated by operation of the machine can be effectively separated from the outside through an arranged sound insulation cover, meanwhile, a C-shaped cavity is filled with sound insulation cotton, the sound insulation and noise reduction capacity of the equipment is further improved, sound pollution is avoided, and the health of workers is guaranteed.
Owner:武汉永铖机械工程有限公司
An intelligent evaluation method of ecg signal noise pollution degree and category
ActiveCN110070013BReduce the false positive rate of intelligent diagnosisImprove filtering effectCharacter and pattern recognitionDiagnostic recording/measuringData informationEngineering
Owner:HANGZHOU DIANZI UNIV
Headphone structure
InactiveCN108989933AImprove the problem of poor experienceAvoid the problem of prone to sound wave reflectionIntra aural earpiecesEarpiece/earphone manufacture/assemblyAcoustic waveEngineering
The earphone structure provided by the invention relates to the technical field of earphones. The earphone structure comprises a loudspeaker, comprising a sounding diaphragm and a sound outlet, wherein the sounding diaphragm is used for converting an electric signal into sound and outputting the electric signal through the sound outlet; a pipe, wherein one end of the pipe is arranged on one side of the horn having a sound outlet, and the other end extends in a direction away from the sound outlet to transmit sound output from the sound outlet to an outer space. As a result of that above arrangement, the problem that acoustic wave reflection is prone to occur in the cavity due to the cavity between the pipe and the sound outlet in the prior art can be avoided, and the problem that acousticwave reflection cause acoustic pollution can be improved.
Owner:ETEN ELECTRONICS LTD
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