266 results about "Mechanical noise" patented technology

The invention discloses a multi-sensor fusion-based people flow dynamic identification method and system, relates to the technical field of intelligent traffic, and is used for solving the problems of people flow perception distortion and shielding tracking interruption in a complex environment. The method comprises the following steps: firstly, constructing an environment interference matrix, and dynamically distributing sensor weights according to a radar electromagnetic attenuation rate, thermal imaging illumination abrupt change and a piezoelectric mechanical noise factor; when the thermal imaging density weight is too low and the radar speed weight is greater than a threshold value, triggering piezoelectric gait verification and outputting calibration fusion data; mapping the fusion data to a dynamic grid, calculating three indexes of density entropy, velocity mutation and flow direction consistency, generating a congestion vector, and marking a risk boundary; for a shielding target, generating a virtual track by combining the final known position, speed and density distribution, and optimizing model parameters when a re-identification error exceeds a limit; and finally, a hierarchical dredging instruction is judged and triggered through the virtual track and the risk area space overlapping, and the gate is dynamically adjusted based on the congestion vector to release.

The invention relates to the technical field of artificial intelligence, and discloses a motor manufacturing quality intelligent detection system which comprises a sensor data acquisition module, a data processing module, an artificial intelligence analysis module, a decision feedback module and a report generation module. Aiming at electromagnetic interference and mechanical noise generated by multiple processes, a self-adaptive signal filtering mechanism is established, transient interference components of data collected by a sensor can be reduced in real time, the extraction integrity of key characteristic parameters such as vibration and temperature is ensured, the misjudgment risk caused by signal distortion is reduced, the problem that the omission ratio is too high in traditional detection is solved, and the detection accuracy is improved. And a dynamic association rule base is constructed, so that the system can capture early fault symptoms which cannot be recognized by a traditional single-dimensional model, prediction blind areas caused by multi-field data splitting are reduced, and the product life prediction precision is improved.

The invention relates to the related technical field of image recognition, in particular to an internal mixer rotor defect detection method and system based on image recognition and a medium, and the method comprises the steps: extracting frequency domain and time domain features of an internal mixer rotor according to vibration signals, optimizing image matching defect visual vectors, configuring vibration signal feature vectors, and evaluating defects through a defect classification network after fusion. And if the result exceeds the limit, triggering reminding and linking the mechanical arm to stop. The technical problems that when an internal mixer works, due to oil contamination coverage, imaging on the surface of a rotor is fuzzy, the rotor is easily interfered by mechanical noise in a high-temperature and high-noise environment, and the defect detection precision of the internal mixer rotor is limited are solved, frequency domain and time domain features of vibration signals and optimized rotor image visual features are fused, a defect classification network of an attention mechanism is introduced, and the defect detection precision of the internal mixer rotor is improved. The method has the technical effects of dynamically focusing a tiny defect area, eliminating oil stain interference, adapting to contrast optimization to cope with a high-temperature environment, still keeping clear imaging in an oil stain environment, and ensuring the defect detection precision of the internal mixer rotor.

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.

The present invention relates to a new type of solenoid valve in the field of solenoid valve technology, comprising a valve body and a valve mechanism, wherein an inlet channel and an outlet channel are arranged in the valve body, the valve mechanism comprises a seal for isolating the valve cavity and an electromagnetic structure for driving the seal to move, the electromagnetic structure comprises a cover body, a magnet and a coil, and the magnet and the coil are installed in the cover body at intervals. The present invention embeds the magnet and the coil in the cover body, thereby greatly reducing magnetic leakage, improving the magnetic field utilization rate of the coil, reducing the number of coil turns, reducing power consumption, and effectively solving the heating problem of the solenoid valve. At the same time, the cover body can effectively isolate the external magnetic field, avoid interference with the internal electromagnetic structure, and ensure the stability of the working operation of the solenoid valve; the coil and the valve core with cantilever support are arranged in the gap between the isolation cover and the magnet, so that the solenoid valve will not have any mechanical friction during the process of driving the switch, and the problems of wear and mechanical noise of the solenoid valve are completely solved.

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.

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.

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.

The invention discloses a sanitation vehicle real-time diagnosis system and method based on a distributed ICU controller. The method comprises the following steps: S1, collecting multi-dimensional vibration data in a key system of a sanitation vehicle in real time; s2, preprocessing the data, performing noise reduction processing, and separating mechanical noise and environmental noise in the vibration signal; s3, sparse fault features are extracted, and feature fusion is carried out according to physical characteristics and fault modes of the key system; and S4, based on the extracted fusion features, using a deep learning model to predict a fault probability. According to the method, the problem that environmental sanitation vehicle vibration data is complex and contains a large amount of noise is effectively solved, the accuracy and reliability of fault diagnosis are remarkably improved, the risk of misjudgment and missed judgment is reduced, the real-time requirement of a distributed ICU controller is met, and the reliability of the distributed ICU controller is improved. The fault detection capability of the sanitation vehicle is remarkably improved in a complex noise environment, and the high efficiency and the stability of urban environment cleaning operation are ensured.

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.

The invention belongs to the technical field of building construction flaw detection, and particularly relates to flaw detection equipment for building construction, which comprises a cabinet body, two groups of sliding rails are symmetrically distributed and fixedly connected in the cabinet body, each group of sliding rails is slidably connected with a group of sliding blocks, and the two groups of sliding blocks are fixedly connected with a power supply and a high-pressure fan respectively; an exhaust port is formed in the cabinet body and located at the exhaust end of the high-pressure fan, the air suction end of the high-pressure fan is communicated with a hose, the end, away from the high-pressure fan, of the hose is fixedly communicated with a pipe head, the pipe head is rotationally connected with a vehicle body, and the two ends of the vehicle body are fixedly connected with two first supports respectively. The high-pressure fan is used for generating low pressure to provide suction force, so that the vehicle body can be stably attached to the wall for flaw detection, the vehicle body flexibly moves on the wall surface by driving the Mecanum wheels, and the high-pressure fan and the vehicle body are arranged away from each other; therefore, the negative influence of mechanical noise and wind noise generated when the high-pressure fan provides the suction force on the signal-to-noise ratio of ultrasonic detection is avoided.

The invention belongs to the field of electric reactor noise reduction, and particularly discloses an iron core electric reactor capable of reducing resonance, which comprises an oil tank, an iron core assembly and a connecting assembly arranged in the oil tank, and a plurality of positioning nails arranged between the bottom of the oil tank and the iron core assembly, the connecting assembly comprises a foot pad arranged outside the positioning nail, a rubber pad arranged between the foot pad and the box bottom, an elastic assembly arranged above the foot pad and a steel washer arranged above the elastic assembly; the bottoms of the positioning nails are fixedly connected with the box bottom, and the tops of the positioning nails are connected with the iron core assembly through nuts. The soft wood rubber pad and the belleville spring are combined, the appropriate belleville spring is selected while the parameters of the soft wood rubber pad are adjusted, the difference between the inherent frequency of the connecting assembly and the vibration frequency of the electric reactor is large, resonance is avoided, even resonance is avoided, mechanical vibration is buffered, vibration is damped, noise is absorbed, and transmission of vibration and mechanical noise is reduced.

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.

The invention discloses a wavelet neural network underwater vehicle mechanical noise rapid forecasting method and system based on Adam optimization, belongs to the field of ship underwater radiation noise forecasting, and aims to solve the problem of rapid forecasting of mechanical noise of an underwater vehicle. According to the method, a wavelet neural network noise forecasting model based on Adam optimization is designed, and key variables including the rotating speed and power of mechanical equipment, vibration isolation measures, the form of a base, the thickness of a web and a panel, the material and the thickness of a shell and fluid medium density data are selected as characteristic conditions; an Adam optimization algorithm is introduced to optimize gradient descent of a wavelet neural network model, first-order moment estimation and second-order moment estimation are adopted to dynamically adjust the learning rate of each parameter, model learning is accelerated, the network recognition precision is improved, and oscillation is reduced during convergence. And the training set is used to carry out iterative training on the optimization model to obtain a high-precision noise prediction model, the prediction of the mechanical noise of the underwater vehicle is realized, and the method has the advantages of wide applicability, high precision and the like.

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.

The utility model provides a protective top cover suitable for a motor with a mixed flow ventilation structure, which comprises a cover body and a bottom plate, and the inside of the cover body is divided into an air inlet chamber and an air outlet chamber by a main partition plate; a flow guide partition plate is arranged in the air inlet cavity and divides the air inlet cavity into a front air inlet space, an upper air inlet space and a rear air inlet space, and a louver for external air inlet is arranged on a side plate of the front air inlet space. A steel plate net and an inclined baffle are installed at an air outlet of the air outlet cavity, and the inclined baffle obliquely extends upwards from the position below the air outlet to the inner side of the air outlet cavity. According to the utility model, the air inlet chamber adopts the blind window and the zigzag air inlet space structure, and the air outlet of the air outlet chamber adopts the inclined baffle plate and the steel screen, so that water splashing in different directions can be borne, high-speed air and airborne particles are prevented from directly leading to the internal air path of the electrified part of the motor, and the I P24 protection grade is reached; and meanwhile, mechanical noise caused by a large fan of a mixed flow ventilation structure motor is reduced.

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.

The present invention relates to a machine joint, wherein a connector is fixed on the top surface; baffles are connected to the edges of the left and right sides, and grooves are provided on the baffles; a threaded hole is provided on the front side, and grooves are provided outside the threaded hole; a connector is fixed on the bottom surface, and a threading hole is designed. The present invention also relates to a flexible robot arm, comprising a base, a plurality of machine joints and an end mechanism connected in sequence, the base is designed with grooves, the end mechanism is designed with connecting parts to connect the machine joints, and the machine joints are connected by SMA wires and tension springs. The machine joint and flexible robot arm designed by the present invention can solve the problems of the robot arm being heavy due to the superposition of multiple sets of motors and metal gear parts, which is not conducive to flexible deployment and portable application; the problem that the metal gears generate large mechanical noise when running, which is not suitable for application scenarios that are sensitive to environmental noise; and the problem that the motor and gear combination structure is large in size and has many components, resulting in high maintenance costs and failure rates.

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.

The high-vibration-resistance noise reduction heat exchanger integrated assembly comprises a first-stage noise reduction module, a second-stage noise reduction module and a third-stage noise reduction module, the first-stage noise reduction module comprises a columnar noise reduction shell, noise reduction holes are formed in the inner wall of the noise reduction shell, an interlayer is arranged in the noise reduction shell to serve as a noise reduction cavity, the noise reduction holes communicate with the noise reduction cavity, and the second-stage noise reduction module comprises a second-stage noise reduction module and a third-stage noise reduction module; the second-stage noise reduction module comprises a connecting cover, a sonic sensor, a central processing unit and a reverse sonic generator, the third-stage noise reduction module comprises a noise reduction opening, the noise reduction opening and a connecting cavity are integrally formed, the noise reduction opening is aligned to an air outlet in the top of the heat exchange body, and the first-stage noise reduction module can reduce noise generated by friction of flowing water and air; the secondary noise reduction module can perform active noise reduction on mechanical noise of the motor and the fan, the tertiary noise reduction module performs noise reduction on the air outlet, through the tertiary noise reduction mechanism, noise reduction treatment is performed on friction noise of air and internal mechanical noise by adopting different means, the noise reduction effect is good, and excessive space cannot be occupied.

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.

The invention provides a telescopic low-noise spring cable with wear-resistant and bending-resistant functions, the telescopic low-noise spring cable comprises a spiral elastic section and a traction extension section which are connected, the axial length of the spiral elastic section is increased under the tension action of the traction extension section, and the spiral elastic section and the traction extension section each comprise an inner conductor layer and an outer conductor layer; the insulating layer coats the radial outer side of the inner conductor layer; the semi-conductive layer is directly coated on the radial outer side of the insulating layer, and the semi-conductive layer is made of graphite; the radial outer side of the semi-conductive layer is coated with the outer conductor layer; and the wear-resistant and bending-resistant sheath layer coats the radial outer side of the outer conductor layer. The telescopic low-noise cable has good wear resistance and bending resistance when the spiral elastic section of the telescopic low-noise cable stretches out and draws back, has the use characteristics of an existing spring cable, and has a low mechanical noise value.

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.

The present invention discloses a guide shoe structure of a magnetic levitation elevator, comprising a mounting seat and a guide shoe body, wherein a guide rail body is provided on the top of the mounting seat, and thorn strips are symmetrically installed on both sides of the top of the mounting seat; guide shoe coils are symmetrically provided on both sides of the top and bottom of the guide shoe body, and connecting blocks are symmetrically installed in the middle of both sides of the guide shoe body, and mounting shells are installed on the tops of both sides of the guide shoe body, through holes are opened on both sides of the mounting shells, and connecting plates are slidably connected inside the through holes; the present invention uses magnetic levitation technology to operate in a state where the guide shoe and the guide rail are not in contact, thereby achieving low vibration and low noise; through the cooperation of the guide shoe body and the guide shoe coil, the elevator runs along the guide rail body, and the guide shoe body and the guide rail always maintain an appropriate distance between them under normal conditions. Compared with the previous roller guide shoe type elevator, the mechanical noise generated when the roller rotates and the guide rail contacts can be eliminated, thereby achieving silent operation.

Routines and methods disclosed herein can increase a power efficiency of a prosthetic hand without drastically reducing the speed at which it operates. A prosthesis can implement an acceleration profile, which can reduce an energy consumption of a motor, or an amount of electrical and / or mechanical noise produced by a motor, as the motor transitions from an idle state to a non-idle state. A prosthesis can implement a deceleration profile, which can reduce the energy consumption of the motor, or an amount of electrical and / or mechanical noise produced by a motor, as the motor transitions from a non-idle state to an idle state.

The invention discloses a hollow cup brushless direct current motor with low noise vibration. The hollow cup brushless direct current motor comprises an outer shell and a sub hollow cup winding installed in the outer shell. A rear cover body is installed on the rear side of the outer shell. A connecting wire is installed in the lower portion of the rear cover body in a penetrating mode, and a Hall sensor is arranged on the front side of the connecting wire. The rear end of the rotating shaft rod is connected with the interior of the rear cover body through a bearing body. The front end of the rotating shaft rod is connected with the interior of the front cover body through a bearing body. According to the hollow cup brushless direct current motor with low noise and vibration, lubricating oil in the liquid storage frame with a circular ring-shaped structure is sprayed out through the inclined jet orifice when the liquid storage frame rotates in a reciprocating manner, so that the bearing body is lubricated well, and the mechanical noise and vibration of the bearing body are reduced; therefore, the coreless brushless direct current motor can be used in a low-noise vibration manner, and the service life of the coreless brushless direct current motor is prolonged.

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.

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.

The invention relates to the field of ship vibration noise control, in particular to a ship high-pressure pipeline system pump source operation condition installation posture low-noise compensation structure which comprises a pump set, a balance flexible connecting pipe is fixedly connected to an inlet and outlet pipeline of the pump set, and a vibration reduction platform is arranged on the pump set. The vibration reduction platform is provided with a vertical adjusting assembly relative to the pump set, and the vertical adjusting assembly limits the pump set to be in a vertical state. The method has the effects that the low-noise operation posture of the pump set is guaranteed, the operation inclination displacement of the pump set is reduced, the vibration noise of the pump set in the operation state is reduced, and the ship mechanical noise is reduced.

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.