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147 results about "Mechanical noise" patented technology
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Noise measurement system for new energy tire
PendingCN121453431ASubsonic/sonic/ultrasonic wave measurementUsing electrical meansDrive wheelData acquisition
The invention relates to the technical field of noise measurement systems, in particular to a noise measurement system for a new energy tire, which comprises a tire positioning and driving unit, a sensor unit, a data acquisition and synchronization unit, a data processing unit, a data analysis unit and a man-machine interaction and display unit, the tire positioning and driving unit simulates different loads, different speeds and different road conditions of a tire by using a rack type tire positioning device, and drives the tire to rotate by using a brushless mute motor, so that a high-speed rotating effect without introducing extra mechanical noise is realized; the sensor unit is arranged on the two sides of the tire and at the position close to the ground through an acoustic sensor free field type condenser microphone array, is fixed to the suspension support through an acceleration sensor and is used for collecting vibration signals; the running states of the tire under different loads, speeds and road conditions are accurately simulated, noise data of the tire under various actual working conditions are obtained, and the measurement result is closer to the real situation.
Owner:QINGDAO SENTURY TIRE CO LTD
Voice instruction recognition and cleaning control method for sweeping robot
The invention relates to the technical field of voice recognition, and discloses a voice instruction recognition and cleaning control method for a sweeping robot, which comprises the following steps: synchronously reading a dust collection motor driving pulse width modulation value and a rolling brush motor load current value of the sweeping robot while acquiring an audio signal acquired by a microphone; retrieving and interpolating in a preset working condition noise spectrum mapping table according to the non-acoustic operation state data, determining a predicted mechanical noise power spectrum at the current moment, taking the predicted mechanical noise power spectrum as a priori reference, calculating an instantaneous signal-to-noise ratio of the predicted mechanical noise power spectrum and the frequency domain feature sequence, and constructing a frequency domain confidence mask; according to the method, a feedforward prediction mechanism is constructed by introducing non-acoustic prior information, and response lag of traditional acoustic posteriori estimation during sudden change of working conditions is avoided.
Owner:ZHUHAI KAIHAO ELECTRONICS CO LTD
Elevator steel belt damage detection and quantitative analysis system based on eddy current and magnetic flux leakage dual-mode detection
The invention discloses an elevator steel belt damage detection and quantitative analysis system based on eddy current and magnetic flux leakage dual-mode detection, and aims to solve the problems of single-mode information loss and serious industrial field strong noise interference in the existing steel belt detection. The system synchronously integrates an eddy current sensor, a magnetic flux leakage sensor and an encoder through a multi-probe array adapter; and multi-dimensional damage physical information in the steel strip is obtained. An improved wavelet packet transform-empirical mode decomposition (WPT-EMD) collaborative noise reduction algorithm is adopted, and in combination with a sub-band energy entropy and a self-attention mechanism, non-stationary mechanical noise is effectively filtered out. A multi-rule feature extraction engine is used for extracting smooth residual errors, derivative mutation and other features, a support vector machine (DE-SVM) model introducing physical priori knowledge weights is constructed, and the small sample recognition problem is solved in combination with a virtual sample generation technology. The method can realize high-precision positioning and quantitative evaluation of steel strip damage under complex working conditions, and has the characteristics of strong anti-interference capability, high identification accuracy and good generalization performance.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Communication voice noise reduction method based on AI
The invention relates to the technical field of intelligent communication, in particular to an AI (Artificial Intelligence)-based communication voice noise reduction method, which comprises the following steps of: 1, collecting noise of multiple scenes, recording noisy voice through a microphone array, and covering complex environments such as traffic, restaurants, meetings and the like; 2, constructing a dialect voice database, adding a noise mixing layer (such as sudden whistling and keyboard tapping) and a scene evolution layer, and simulating a real environment; according to the method, multi-scene noise is collected, noisy voice is recorded through a microphone array, a dialect voice database is constructed, a noise mixing layer is added, voice features of different dialects in a complex environment are simulated, a deep learning model is deployed on edge equipment, and low-delay noise reduction is achieved through real-time processing. Mechanical noise, aerodynamic noise and external environment noise are distinguished through the dynamic noise recognition module, the noise reduction intensity is adjusted to adapt to scenes such as elevators, meeting rooms and vehicles, and therefore the method can adjust the noise reduction intensity in a self-adaptive mode.
Owner:ZHONGCHUANG INT INSPECTION & CERTIFICATION (SHENZHEN) CO LTD
High-precision identification method and system for noise source of asynchronous motor
The invention discloses a high-precision identification method and system for a noise source of an asynchronous motor, and relates to the technical field of asynchronous motor detection, and the method comprises the following steps: constructing a finite element model of a to-be-analyzed asynchronous motor, dividing the surface into a plurality of detection sub-regions, and carrying out the operation simulation of the finite element motor, analyzing vibration speed and sound pressure signal data of each sub-region, synchronously acquiring actual signals, calculating relative differences with simulation data, evaluating detection priorities by combining historical fault times, forming a detection sequence according to the priorities, and sequentially performing sound-vibration coherence analysis and coherence function calculation to obtain a sound-vibration coherence detection result; according to the method, noise frequency bands are classified into structural noise and air noise, order tracking analysis is performed on the structural noise obtained through classification, an amplitude stability index and an amplitude change gradient are calculated, automatic classification and identification of electromagnetic noise and mechanical noise are realized based on a preset threshold value, and the efficiency and accuracy of fault processing are remarkably improved.
Owner:NANTONG CHANGJIANG ELECTRIC APPLIANCE CO LTD
Electronic expansion valve
The utility model relates to the technical field of expansion valves, in particular to an electronic expansion valve. The electronic expansion valve comprises a valve body assembly, a valve element assembly and an elastic piece, an assembly hole and a valve port are formed in the valve body assembly, the assembly hole comprises a threaded section and a limiting section, internal threads are arranged in the threaded section, and a limiting part is formed in the limiting section. The valve element assembly comprises a screw rod and a valve needle, the screw rod is provided with an external thread, and the external thread is in threaded fit with the internal thread so as to drive the valve element assembly to move in the axial direction of the electronic expansion valve. A stop part is arranged on the outer wall of the valve element assembly, the elastic piece is arranged on the periphery of the valve element assembly in a sleeving mode and arranged between the stop part and the limiting part, and the two ends of the elastic piece are matched with the stop part and the limiting part in an abutting mode so as to apply acting force to the valve element assembly to move in the direction away from the valve port. The upper end face of the flange of the external thread can abut against the lower end face of the flange of the internal thread. According to the electronic expansion valve, the problem that an existing electronic expansion valve is prone to generating large mechanical noise in the operation process is solved.
Owner:ZHEJIANG DUNAN HETIAN METAL CO LTD
Mounting structure of brushless motor rotor
ActiveCN120999947AMagnetic circuit rotating partsSupports/enclosures/casingsBrushless motorsElectric machinery
The invention relates to an installation structure of a brushless motor rotor, which comprises a rotor, and a through shaft hole is formed in the center of the rotor and is used for installing a steel shaft on the rotor along the axial direction; the magnet and the limiting sleeve are arranged on the periphery of the rotor; an elastic limiting structure is arranged on the rotor around the shaft hole; the elastic limiting structure comprises a limiting side and an elastic side which are arranged in the circumferential direction, and the limiting side and the elastic side jointly form an elastic limiting channel coaxial with the shaft hole. The limiting side is formed on the limiting claw and limits the steel shaft in the radial direction; the elastic side is formed on the elastic claw, and the elastic claw can be bent and deformed relative to the shaft hole, so that a dynamic gap is formed between the elastic side and the steel shaft. The beneficial effects of the invention lie in that the elastic limiting structure is arranged, under the condition that the coaxiality of the steel shaft and the rotor is maintained, through dynamic gap compensation, the gap between the rotor and the steel shaft is eliminated in real time, the rotor is dynamically attached to the steel shaft, the rigid collision between the rotor and the steel shaft due to radial shaking is avoided, and the mechanical noise of the motor is reduced.
Owner:NINGBO HUAKAI ELECTRONICS TECH CO LTD
Meshing type load chain structure and chain group thereof
The utility model discloses a meshing type load chain structure and a chain group thereof. The chain structure comprises a first chain A and a second chain B which are oppositely arranged, the first chain A and the second chain B are each formed by connecting a plurality of chain links with two or more inner chain pieces and outer chain pieces in series, wherein the outer chain pieces are connected with the chain links in an end-to-end alternating mode through pin shafts. The inner chain pieces and the outer chain pieces are the same in shape and structure and are in axial symmetry. Each inner chain sheet of the first chain A and the inner chain sheet of the second chain B are oppositely and correspondingly arranged and are meshed with each other; each outer chain sheet of the first chain sheet A and the outer chain sheet of the second chain B are oppositely and correspondingly arranged and are meshed with each other; and the opposite surfaces of the inner chain sheets and the outer chain sheets are parallel and continuous smooth curved surfaces. By the adoption of the chain structure and the chain set, the load generated when the chain structure is used for conducting linear reciprocating transmission in a limited space can be effectively increased, and the mechanical noise problem generated when the chain structure and the chain set are in the working state is remarkably reduced.
Owner:BEIJING WINCOMN TECH DEV
A noise control method, system, device and storage medium of a micro engine
The application discloses a noise control method, system and device of a micro engine and a storage medium, belongs to the technical field of engine noise control, and solves the technical problem that the micro engine is difficult to achieve an ideal noise reduction effect. The method is: collecting intake / exhaust noise, mechanical noise and combustion noise data in the working process of the micro engine, and performing empirical mode decomposition to decompose the noise signal into a plurality of IMF components of intrinsic mode functions; an LSTM neural network model is constructed; the LSTM neural network model is trained to obtain an EMD-EGMGWO-LSTM model; in the working process of the micro engine, noise data is collected in real time and input into the trained EMD-EGMGWO-LSTM model to obtain a predicted value of the noise data; and an anti-phase noise control signal opposite in phase and matched in amplitude is generated in real time to achieve an efficient active noise reduction effect. The control strategy can be continuously optimized and adjusted, and the noise reduction effect is improved.
Owner:GUANGXI UNIV
Apparatus and method for evaluating noise in microscope devices
This invention provides a noise evaluation apparatus and method for microscope devices. [Solution] A device for evaluating the effect of noise acting on a microscope device, the device comprising: a microscope device that detects a signal generated by a sample and forms a corresponding detection signal; a noise sensor unit that detects noise and forms a corresponding noise detection signal, and includes a mechanical noise sensor for detecting mechanical noise and a magnetic field sensor for detecting magnetic field noise; a control unit that generates a monitor signal corresponding to the drive signal of the microscope device; and a signal processing unit that receives one or more of the noise detection signal and the monitor signal and performs signal processing, the signal processing unit calculates the correlation between one or more of the noise detection signal and the monitor signal and the detection signal.
Owner:KOREA RES INST OF STANDARDS & SCI
A noise reducing fuselage
The utility model relates to the technical field of floor washing machine, and disclose a kind of noise reduction fuselage, including shell, the inside of the shell is equipped with driving motor by connecting rack installation;By setting the form of fully-enclosed shell, the mechanical noise generated when driving motor operates can be blocked, thereby avoiding the sound leakage problem caused by traditional heat dissipation opening, improving the noise reduction effect, by the heat conduction ring plate and the heat dissipation fin set, the surface of driving motor is directly attached using heat conduction ring plate, the heat generated during its operation can be conducted to the heat dissipation fin above the shell, thereby using the air flow outside the shell to dissipate heat, avoiding to open the shell, further, the heat dissipation coil pipe is embedded in the heat conduction ring plate, the cooling medium is circulated by pump body drive, the heat can be brought to the liquid storage box to disperse, further guarantee the heat dissipation effect, using the two heat dissipation modes to cooperate, under the premise that the shell is not opened, better heat dissipation efficiency can be realized.
Owner:ANHUI DAVAO ROBOT TECH CO LTD
A shutter device for strong light adaptive processing
The utility model discloses a kind of shutter equipment of strong light self-adaptive processing, it is related to shutter system application field, including bearing plate, the top of bearing plate is rotatably connected with movable ring, the outside of movable ring is provided with outer gear ring, the inside of movable ring is provided with inner gear ring, the side of movable ring is rotatably connected with transmission gear, transmission gear and outer gear ring are mutually engaged, transmission gear is connected with driving device, the top of bearing plate is provided with shutter assembly.The utility model can avoid mutual impact between curtain by setting multiple shutter assembly stacks, reduce the noise when shutter system works, four groups of shutter assembly are stacked from top to bottom distribution, four groups of curtain in four groups of shutter assembly are evenly distributed with exposure hole as center, curtain can achieve the purpose of plugging exposure hole when moving, and because multiple curtain is at different horizontal height, multiple curtain will not impact each other, reduce the generation of mechanical noise when shutter system works.
Owner:南京海汇装备科技有限公司
Servo synchronous tracking control method and system for cold cutting flying saw
ActiveCN121618894AElectronic commutation motor controlElectric motor controlAdaptive weightingControl engineering
The invention relates to the field of flying saw servo control, in particular to a cold cutting flying saw servo synchronous tracking control method and system, and the method comprises the steps: firstly carrying out the time sequence alignment and detrending processing of current and speed signals through a synchronous collection link; secondly, calculating an original torque containing full-band information based on an inverse dynamic model; fast and slow dual-channel filtering is constructed, and high-frequency impact and steady-state load features are extracted respectively; and finally, calculating a dynamic confidence coefficient weight by using transient energy analysis, performing adaptive weighted fusion on the dual-channel signals, and injecting current loop feedforward. According to the scheme, mechanical noise is shielded, and meanwhile rapid compensation of millisecond cutting impact is achieved. According to the method, fast and slow dual-channel filtering based on an inverse dynamic model is adopted, a dynamic confidence coefficient weight is calculated in combination with a transient energy difference value, and self-adaptive fusion compensation of disturbance signals is achieved.
Owner:HANDAN YOU FA STEEL PIPE CO LTD
Water pump intelligent monitoring control system and application method thereof
The invention provides a water pump intelligent monitoring control system and an application method thereof. In the method, a control system firstly extracts a mechanical noise component corresponding to a real-time rotating speed from initial baseline data by utilizing the relevance between the rotating speed and mechanical noise, and then constructs a baseline noise template to obtain mechanical noise interference during normal operation of a water pump. And the control system subtracts the baseline noise template from the original acoustic vibration signal to obtain a residual signal containing impurity impact information. And then the control system carries out continuous wavelet transform on the residual signal, and a generated time-frequency energy distribution diagram can identify the time node and frequency characteristics of the impact event so as to realize positioning of the impact event. And finally, the control system calculates the impact event rate and the average impact energy value in a preset statistical time window, and quantifies the progressive accumulation process of blockage. According to the method, the technical problem that early blockage cannot be identified by fixed threshold alarm is relieved, and the timeliness of fault prediction is improved.
Owner:GP ENTERPRISES CO LTD
Friction stir additive manufacturing real-time defect detection method and system based on structural sound signal
PendingCN121114234AMaterial analysis using acoustic emission techniquesProcessing detected response signalFrequency spectrumNoise
The invention relates to a real-time defect detection method and system for friction stir additive manufacturing, in particular to a real-time defect detection method and system for friction stir additive manufacturing based on structural sound signals. The invention aims to solve the problem that in-layer and interlayer defects and other internal defects are difficult to monitor in real time in the friction stir additive manufacturing process. According to the invention, a plurality of piezoelectric sensor arrays are installed on a main shaft or a sleeve of equipment, vibration signals are collected, and directional differential conversion is executed to suppress mechanical noise; performing short-time Fourier transform on the filtered signal to generate a time-frequency spectrum, and inputting a convolutional neural network model to output a defect probability; when the probability is larger than or equal to 0.8, defect coordinates (the precision is + / -0.5 mm) are positioned according to the motion trail of the machine tool, and technological parameters are adjusted in a self-adaptive mode at the next deposition layer for repairing. According to the invention, online identification of 0.4 mm level defects (the detection delay is less than or equal to 300ms) is realized, and the limitation that the traditional acoustic emission technology cannot realize spatial positioning is broken through. The invention belongs to the technical field of friction stir additive manufacturing.
Owner:HARBIN INST OF TECH
A rapid three-dimensional acoustic elasticity prediction and line spectrum identification method for ship machinery noise based on online equipment vibration monitoring.
This invention relates to a method for rapid three-dimensional acoustoelastic prediction and line spectrum identification of ship mechanical noise based on online equipment vibration monitoring. The method includes: establishing a refined three-dimensional acoustoelastic calculation model for the overall ship vibration and acoustic radiation calculation of the equipment-vibration isolator-base-shell; applying a unit sweep force at the equipment's center of gravity node to obtain the transfer function from the average vibration acceleration spectrum of each equipment's base surface to the radiated noise; multiplying the average vibration acceleration spectrum monitored online in real time with the transfer function to obtain the ship mechanical noise under real-time excitation of each equipment; performing incoherent superposition of the radiated noise from each equipment to achieve rapid three-dimensional acoustoelastic prediction of ship mechanical noise; extracting the line spectrum peak value, and determining the main source of the line spectrum peak value by calculating the energy contribution of each equipment to the line spectrum peak value. This method achieves high-precision online prediction and automatic identification of the line spectrum source of ship mechanical noise, with high computational efficiency and strong engineering applicability.
Owner:CHINA SHIP SCIENTIFIC RESEARCH CENTER
Lock body convenient to assemble and capable of preventing abnormal sound
The utility model discloses a lock body convenient to assemble and capable of preventing abnormal sound, which comprises a mounting plate, a first mounting component is arranged at one end of the mounting plate, a second mounting component is arranged on the first mounting component, and by arranging the first mounting component and the second mounting component, a plastic block is adopted to replace a traditional metal material to be used for mounting. Compared with the prior art, the assembly process is greatly simplified, the production cost is reduced, material waste is reduced, the spring and limiting column structures are additionally arranged in the lock body, connection among all components is more stable, vibration generated in the operation process is effectively absorbed, mechanical noise is greatly reduced, and the service life of the lock is prolonged. In addition, by adopting buffer rubber and limiting holes, the stability and the mute effect of the device are further enhanced, meanwhile, the error-tolerant rate during assembly is increased, and installation is more convenient and faster.
Owner:ANHUI HENGGUO AUTO PARTS CO LTD
Operation parameter control method of non-intrusive material homogenizer
ActiveCN121534605ATransportation and packagingMixer accessoriesControl engineeringElectric machinery
The invention belongs to the technical field of homogenizer control, and particularly relates to an operation parameter control method of a non-intrusive material homogenizer, which comprises the following steps: acquiring a load current of a main driving motor and a revolution phase of a revolution arm in real time; acquiring an interpolation current value when a system track passes through a preset Poincare section by monitoring a revolution phase and utilizing a linear interpolation method; performing normalization processing on the interpolation current value and constructing a Poincare feature point; calculating manifold dispersion based on the Poincare feature points in the sliding window; and adaptively calculating the target revolution speed of the next period by using an exponential function according to the manifold dispersion, and performing variable structure control on the homogenizer. According to the method, the intrinsic rheological characteristics of the material can be effectively stripped from the strong periodic mechanical noise, the problem of phase lag caused by filtering in the prior art is solved, and mixed end point judgment and self-adaptive energy consumption control of the homogenizer are realized.
Owner:SUZHOU ZHONGYI PRECISION TECH CO LTD
Intelligent fragrance box for driving
The intelligent fragrance box comprises an upper shell and a lower shell, an upper cover is arranged at the upper end of the upper shell, a fragrance regulator is arranged in the middle of the upper cover, a sliding mechanism capable of sliding up and down is arranged in the middle of the upper shell, a fragrance channel is formed in the center of the sliding mechanism, and the upper end of the fragrance channel leads to the fragrance regulator. A middle cover is arranged between the upper shell and the lower shell, the lower side of the diffusion cotton is located in the middle cover, the middle of the middle cover is connected with a perfume supply device, the middle cover is provided with a plurality of air suction cavities, the air suction cavities are communicated with an inner cavity of the lower shell, and a plurality of air inlet mechanisms are arranged on the peripheral side of the lower shell. And the lower side of the diffusion cotton is connected with the suction cavity. The scheme has the advantages that the air inlet and the air outlet are larger, and fragrance is emitted faster. According to the scheme, the upper anti-collision ring and the lower anti-collision ring have the dual effects of protecting the upper shell, the upper cover and the counterweight sleeve from being collided and reducing mechanical noise. According to the scheme, screws are not needed, and assembling is easy.
Owner:HUIZHOU JURONG TECHNOLOGY CO LTD
A fan with noise reduction function
The utility model provides a fan with noise reduction function relates to fan noise reduction technical field, including ventilation pipe still includes the vibration reduction subassembly, and the vibration reduction subassembly includes the soundproofing cotton fixedly connected in the inside of ventilation pipe, the inside fixedly connected with the positioning plate of ventilation pipe, the inside fixedly connected with the inner side plate of one end of ventilation pipe close to the positioning plate, the refraction subassembly, the refraction subassembly includes the refraction board fixedly connected in the inside both ends of ventilation pipe, the inside of refraction board is provided with the resilience angle, the inside of resilience angle is provided with the inner recess, the inside fixedly connected with the ventilation subassembly of ventilation pipe, like this design has realized the stable form of soundproofing cotton under the high speed airflow, suppresses ventilation pipe thin wall resonance, reduces the eccentric vibration of fan blade, thereby effectively solved the secondary structure radiation noise caused by motor and impeller unbalance excitation, from the source controlled mechanical noise, weakened the vibration transmission problem caused by eccentricity.
Owner:DONGGUAN FOERSHENG M&E TECH CO LTD
Hybrid flux machine for robots
The application relates to the technical field of robot driving motors, and provides a hybrid flux motor for a robot, which comprises an end cover, a radial magnetic ring, a modulation ring, a radial flux stator and an axial flux stator; the end cover is provided with a first mounting core column, the radial magnetic ring is sleeved outside the first mounting core column, the modulation ring is sleeved outside the radial magnetic ring, a plurality of through strip-shaped grooves are formed in the circumferential wall of the modulation ring, the radial flux stator is sleeved outside the modulation ring, the modulation ring is integrally formed with a platform part, the center of the platform part extends along the axial direction and is provided with a second mounting core column, and a plurality of axial magnetically conductive teeth are arranged in the circumferential direction on the end face of the platform part; and the axial flux stator is sleeved on the second mounting core column. Through the technical scheme, the technical problems of low power density, high temperature rise and large mechanical noise of a robot joint module in the prior art are solved.
Owner:SHAANXI ZHILITE EMBODIED INTELLIGENT TECHNOLOGY CO LTD
A high-efficiency heat dissipation device for servers
ActiveCN224287477UEfficient heat dissipationLarge cooling flow effectDigital data processing detailsEnergy efficient computingMotor speedThermodynamics
This utility model discloses a high-efficiency heat dissipation device for servers, comprising a housing and an intake fan. The housing has an axially penetrating heat dissipation channel with an air inlet and an air outlet arranged opposite each other. The intake fan is disposed at the air inlet. The housing also includes at least one auxiliary air duct formed on the housing, with an auxiliary air inlet and an auxiliary air outlet arranged opposite each other. The auxiliary air outlet is connected to the heat dissipation channel, and the auxiliary air inlet and the air inlet are located on the same plane. Compared with traditional cooling fans, the high-efficiency heat dissipation device for servers provided by this application can achieve a greater cooling flow effect at the same motor speed, thus achieving efficient heat dissipation, while reducing mechanical noise generated by rotation at lower motor speeds.
Owner:HUNAN ELECTRONIC INFORMATION IND RESEARCH INSTITUTE
Noise reduction fan, energy storage tank and vehicle-mounted refrigerator
The invention discloses a noise reduction fan, an energy storage tank and a vehicle-mounted refrigerator, the noise reduction fan comprises a fan base, a fan mounting plate, a fan body, a noise reduction structure and a damping structure, and the interior of the fan base is hollow and circular; the fan mounting plate corresponds to the fan base in shape and is detachably mounted on one side of the fan base; the fan body is detachably mounted on the other side of the fan base and blows air towards the fan mounting plate; the noise reduction structure is arranged in the fan mounting plate and is used for reducing noise of the noise reduction fan; the damping structure is arranged between the fan base and the fan body and used for damping of the noise reduction fan. The noise reduction structure and the damping structure are used in cooperation, so that airflow generated during fan operation can be effectively divided and buffered, airflow noise can be weakened, mechanical noise generated by fan vibration can be absorbed, the dual noise reduction effect is remarkable, the fan noise in a vehicle-mounted closed space can be effectively reduced, and the comfort level of the environment in a vehicle is improved.
Owner:WUHAN KAIWATSON IND TECH CO LTD
Novel intelligent fragrance box
ActiveCN224130839Ureduce frictionfully distributedAir-treating devicesAroma aromaSuspension (vehicle)
The utility model relates to a novel intelligent fragrance box which is arranged in a vehicle and comprises an upper shell and a lower shell, an upper cover assembly is arranged on the upper portion of the upper shell, a jumping cavity is formed in the upper shell, a counterweight assembly is arranged in the jumping cavity, magnetic suspension mechanisms are arranged in the counterweight assembly and the upper shell, and a perfume assembly is arranged in the lower shell. Fragrance conveying channels are arranged in the lower shell, the upper shell and the upper cover assembly, and in the running process of the vehicle, the balance weight assembly loses balance between the gravity of the balance weight assembly and magnetic thrust of the magnetic suspension mechanism due to vibration of the vehicle, and the balance weight assembly jumps up and down to drive fragrance in the fragrance conveying channels to be exhausted upwards. The product is high in magnetic levitation jumping sensitivity, and is suitable for middle and high-end vehicle types with good damping systems. The counterweight assembly of the product is not contacted with the wall of the jumping cavity, almost no friction is generated, mechanical noise is not generated, and the product is more durable and longer in service life. The magnetic suspension mechanism is used, the structure and the technology are simple, assembling is easy, and batch production is achieved.
Owner:HUIZHOU JURONG TECHNOLOGY CO LTD
Protective top cover suitable for motor having mixed-flow ventilation structure
PCT designated stageWO2026025579A1Cooling/ventillation arrangementSupports/enclosures/casingsElectric machineStructural engineering
Owner:SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT +2
Iot-based underground corrugated compensator leakage positioning method and system
PendingCN122107297AReduced operating power consumptionFilter out background mechanical noise interferencePipeline systemsSample ModeNoise
The application relates to the technical field of urban underground pipe network safety monitoring, and discloses a wave corrugation compensator leakage positioning method and system based on an Internet of Things, which is applied to an Internet of Things system comprising a cloud server and a plurality of sensing nodes, and the sensing nodes are installed in the interlayer space of the wave corrugation compensator. The method comprises the following steps: collecting pressure and temperature data of the interlayer space by the nodes at a low frequency, triggering an adjacent node to enter a high-frequency acoustic sampling mode when the pressure change rate is greater than a dynamic threshold value; collecting an acoustic emission signal, filtering mechanical noise through a noise reduction model, and extracting fluid jet noise characteristics; performing cross-correlation analysis on the acoustic signals between the nodes to calculate the actual sound wave conduction distance, and verifying whether real leakage occurs by comparing with a physical topological distance; and finally evaluating the leakage grade according to the steady-state peak value of the pressure data and the acoustic frequency energy data, and outputting device coordinate information. The application has both ultra-low power consumption and strong anti-interference capability, and realizes accurate element-level leakage positioning.
Owner:GANSU WALL TECH CO LTD
A home appliance motor noise reduction control method based on adaptive filtering
The application discloses a kind of based on adaptive filtering's household appliance motor noise reduction control method, it is related to household appliance motor control technical field, including: acquisition motor operation multi-source signal, form working condition vector;Spectrum analysis is carried out to sound pressure information and vibration acceleration information, identifies noise frequency band and locates main peak, generates target noise frequency band set;Based on motor operation signal generates reference signal and error signal;Reference signal is input adaptive filter, target noise is estimated and suppressed on line;Based on residual noise distribution generates noise reduction compensation control quantity, feedback to motor drive end;Store operating data and update filter parameter.The application working condition vector comprehensively reflects the real-time running state of motor, when identifying noise frequency band, can accurately distinguish the source type of electromagnetic noise, mechanical noise and aerodynamic noise by combining speed information and commutation frequency, avoids the noise source confusion when judging only according to single signal.
Owner:ZHEJIANG DEQING SHENGHONG ELECTRIC APPLIANCE CO LTD
A portable real ship mechanical noise rapid test and evaluation device and an evaluation method
ActiveCN116147758BMachine part testingSubsonic/sonic/ultrasonic wave measurementMarine engineeringClassical mechanics
The application provides a portable real-ship mechanical noise rapid test and evaluation device and method, which comprises a real-ship vibration isolation system model (vibration source sub-model and vibration response sub-model of the vibration isolation system); vibration and noise data of the vibration isolation system in operation are tested based on the vibration source sub-model; vibration responses and transfer functions of each subsystem are obtained based on the vibration response sub-model; the vibration isolation amount, impedance, vibration intensity and the like of the system are obtained based on a vibration isolation characteristic evaluation module, and the vibration isolation effect of the system is rapidly evaluated; vibration responses, cabin noise and underwater radiation noise of the subsystem to be evaluated under different working conditions are calculated based on a real-ship vibration evaluation module; and vibration responses, cabin noise and underwater radiation noise at the evaluation position under the current working condition and the vibration isolation design are examined based on a real-ship test database and an energy superposition principle. The application can rapidly and accurately evaluate the vibration isolation effect, vibration response, cabin noise and underwater radiation noise of the multi-source vibration isolation system under different working conditions, has wide applicability and has a simple implementation process.
Owner:CHINESE PEOPLES LIBERATION ARMY UNIT 92578
A type of household air conditioner fresh air unit
This utility model discloses a household air conditioner fresh air unit, including a device body containing an outer shell. The outer shell contains, in sequence, a coarse filter, a pre-filter, an activated carbon filter, a HEPA filter, and a total heat exchange core. An air inlet pipe is connected to the side of the outer shell, and a maintenance plate is located at the rear end. The maintenance plate contains a mounting groove, a first sound-absorbing cotton, and a second sound-absorbing cotton. The first and second sound-absorbing cottons have a U-shaped clip at their front end and a second U-shaped clip at their rear end. Screw holes are formed in the first and second U-shaped clips, and bolts are screwed into these holes. A mounting base is connected to the bottom of the outer shell. This device can absorb the mechanical noise generated during fan operation and the noise generated by airflow within the duct, improving user comfort and preventing noise interference with daily life and sleep, allowing people to relax and enjoy fresh air more comfortably indoors.
Owner:JIANGYIN FUJI MASCH EQUIP CO LTD
Translation: A translational auxiliary type mechanical noise reduction construction shed
The application provides a translation auxiliary mechanical noise reduction construction shed, each load-bearing mechanism comprises two support modules oppositely arranged along the Y-axis direction and a load-bearing module arranged on the two support modules, each support module comprises a telescopic support frame and a walking assembly, the telescopic support frame is configured to be able to telescopically move along the Z-axis direction to adjust the layout height of the load-bearing module, and a plurality of mounting brackets for mounting sound insulation boards are arranged on the telescopic support frame along the Z-axis direction, the walking assembly is connected to the lower end of the telescopic support frame to drive the telescopic support frame to move or be stationary, and the load-bearing module comprises a load-bearing frame, the load-bearing frame is configured to be able to fold along the Z-axis direction to adjust the layout length, so that the problems that the structure of the existing mobile construction shed is prone to wear, the operation is complicated, the structural correlation is poor, the adjustment is not smooth, the service life is affected, and the overall stability and layout efficiency are reduced are solved.
Owner:BEIJING GAS GRP