39 results about "Mechanical noise" patented technology

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.

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.

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.

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.

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.

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.

The utility model relates to the related field of noise reduction assembly, especially a fan noise reduction assembly, including sound insulation room, sound insulation door, observation window, exhaust pipe, ventilation assembly and sound insulation board etc. The utility model discloses high damping vibration stop layer, high -efficient sound absorption sound insulation layer, metal pipe cover damping rubber are set up to reduce the noise that air flows in the pipeline produces, and is provided with sound insulation board in sound insulation room to reduce the mechanical noise that fan generates when working, and through ventilation assembly to the fan ventilation cooling in sound insulation room, and the sound reduction board can carry out the noise reduction treatment to the flowing air in the ventilation pipe, reduces the noise pollution through, is favorable to reducing the influence of large -scale fan for electric heating furnace in the use process to the production environment.

This application discloses a voice-controlled intelligent lifting control method and system. It synchronously collects acoustic, structural vibration, and Hall pulse data, uses Hall pulses to calculate the current height in real time, and uses this as an index to perform parameter interpolation in a pre-set mapping library, thereby constructing a predicted transfer function dynamically adapted to the current mechanical form. Based on this, the structural vibration attached to the frame is used as a reference signal, and adaptive cancellation filtering is used to restore a clean voice vector, effectively filtering out nonlinear mechanical noise generated by motor operation. In this way, the equipment can maintain extremely high command recognition accuracy even when the motor is running at full speed, fundamentally solving the collision risk caused by voice interruption failures, and significantly improving the real-time performance and physical safety of intelligent lifting interaction.

The utility model provides a kind of low-noise air purifier fan, belong to fan technical field.The low-noise air purifier fan, including purifier shell, the four walls of the purifier shell three sides are equipped with several groups of air inlet grating, the top end of the purifier shell is movably clamped with purifier top cover, the inside of the purifier top cover is provided with fan main body, the back of the fan main body is fixedly connected with motor, the four walls of the fan main body are all fixedly connected with damping device.The utility model has, when air purifier operates, by motor drive fan main body rotation, when fan main body vibration, the vibration of fan main body pushes limit rod to slide in transmission rod two inside, spring of limit rod outer wall sleeve joint absorbs vibration, and mutually offset keeps the stability of fan main body, avoid resonance, reduce mechanical noise, make purifier operate more quietly, reduce the interference to user daily life.

The application discloses a parking power generation vibration control method and device, electronic equipment and storage medium. According to the application, the control parameters under the running condition are not followed, and a special control parameter set for parking power generation is configured independently of the conventional operation mode, so as to cooperatively optimize and adjust the key parameters related to engine combustion, and improve the sound source characteristics in the parking scene from the source. Therefore, the technical problems of significant crankshaft impact vibration, prominent mechanical noise, rough combustion noise quality and obvious vehicle vibration caused by the fact that the existing parking power generation control strategy follows the running condition parameters and is not adapted to the static acoustic environment can be solved, and the technical effects of improving the vehicle quietness during parking power generation, optimizing the user experience, and reducing related complaints are achieved.

A homogeneous laser illumination system for microscopy applications, based on the use of multimode optical fibers (MMF), is described. The system's operating principle relies on the superposition of dynamic speckle patterns generated from several multimode fibers. These patterns are created by applying random, high-frequency perturbations (tens of kilohertz) induced by a piezoelectric actuator that perturbs the optical fibers. The superposition of these patterns reduces illumination contrast, achieving a uniform light distribution across the field of view (FOV). The system's modularity and adaptability allow for its integration into existing microscopy setups. Furthermore, it can be configured to operate with standard commercial objective lenses, including immersion lenses, and adjusted to reduce photobleaching in fluorescent samples.The system uses multimode optical fibers and requires no additional infrastructure to manage vibrations or mechanical noise. It is suitable for fluorescence microscopy and has been successfully tested with wavelengths across the visible spectrum. The system enhances the illuminated area and optimizes the generation of homogeneous light patterns, providing a high-performance and efficient solution for obtaining high-quality images in microscopic studies.

The utility model belongs to the range hood technical field especially has a kind of range hood with sound-absorbing noise reduction structure, first air inlet is equipped with sound-absorbing cotton cover, sound-absorbing cotton cover is horn pipe structure, and one end of sound-absorbing cotton cover is adapted with the air inlet end of centrifugal fan, the other end of sound-absorbing cotton cover is adapted with first air inlet;The air inlet box includes the second air inlet of bottom, the side surface of air inlet box is provided with second air outlet, and the first sound-absorbing piece is provided in air inlet box;The sound-absorbing cotton cover arranged in air outlet chamber adopts horn pipe structure, one end thereof is adapted with the air inlet end of centrifugal fan, and the other end is adapted with first air inlet.This structure design can guide air to enter centrifugal fan smoothly, reduce the turbulence and turbulent flow in the process of airflow, thereby reducing the noise generated by airflow disturbance.Meanwhile, the material of sound-absorbing cotton cover itself has good sound-absorbing performance, and can further absorb part of mechanical noise and airflow noise.

The embodiment of the application relates to the field of optical fiber sensing, and discloses an optical fiber oil leakage detection method, equipment, medium and product; the method comprises the following steps: arranging a sensing optical fiber along a to-be-detected oil pipe, emitting an optical signal to the sensing optical fiber and receiving a reflection signal of the sensing optical fiber; monitoring the change of the reflection signal in real time, and processing the reflection signal through a multi-modal feature fusion extraction method; the multi-modal feature fusion extraction method comprises time-frequency domain feature extraction, spatial domain feature extraction and multi-source data feature fusion; the time-frequency domain feature extraction comprises extracting spectrum features and impact features of oil film diffusion; the spatial domain feature extraction comprises constructing a concentration gradient field of oil film diffusion and extracting spatial distribution features by using a neural network; the multi-source data feature fusion comprises synchronously collecting multi-source sensing data, constructing a feature cross matrix and extracting dimension reduction features; thereby, the interference of stable mechanical noise such as on-site pump valve start-stop and vehicle passing is effectively filtered out, and precise qualitative detection of extremely weak oil leakage events is realized.

The utility model discloses a noise reduction air conditioner air outlet which comprises an air outlet and a pipe body, the pipe body is arranged at the rear end of the air outlet and fixedly connected with the air outlet, and a noise reduction device is arranged on the front side in the air outlet. Through cooperative use of the air outlet, the pipe body, the noise reduction device, the protective cover piece, the protective frame, the noise reduction cotton, the air outlet buffer piece, the air outlet pipe, the noise reduction felt, a mounting assembly, a positioning rod, a lock head, a push spring, a placement groove, a butt joint groove and a pull button, the problems that a large amount of mechanical noise in a pipeline can be transmitted out during air outlet of an existing air outlet, and noise cannot be reduced are solved; and meanwhile, when the air outlet amount of a traditional air outlet is fast and large, air can directly collide with an air plate of the traditional air outlet, then air noise is generated, the surrounding environment is affected, and discomfort of people is caused.

The utility model provides a low -noise cycloid hydraulic motor rotor structure belongs to hydraulic transmission technical field, including the axle cover, sets up the limit hole on axle cover surface, the fixed strip of swing joint in axle cover surface, the clamping block fixed installation in fixed strip both ends, set up the auxiliary assembly on clamping block surface. The utility model discloses through the cooperation of auxiliary assembly and rotating assembly, has realized the noise reduction effect when hydraulic motor operation, the detachable connection mode of fixed shell and clamping plate not only is convenient for assembling maintenance, ensures accurate positioning of rotating assembly simultaneously, the first rotating block adopts the setting of angular deflection with second rotating block, makes transmission more stable, the guiding effect of extruding piece and convex block hydraulic drive cooperation limit slot forms efficient power transmission path, reduces energy loss, the setting of eccentric shaft and transmission shaft guarantees torque output, reduces mechanical noise through the dynamic balance effect of double rotating block.

The utility model discloses a cylindrical thrust mute straight line lock, including handle, bottom plate and prong, handle and prong set up respectively at the both sides of bottom plate, handle can slide relative to bottom plate, prong and handle synchronous movement, its characterized in that handle's side to bottom plate and bottom plate's side to handle are provided with a strip mounting groove respectively, the length direction of strip mounting groove is parallel with the sliding direction of handle, each strip mounting groove is provided with a strip rubber pad respectively, and the spacing is left between two strip rubber pads, and the opposite side of two strip rubber pads is provided with the continuous distribution arc shallow groove respectively, and the limiting protrusion is formed between adjacent arc shallow grooves, and the cylindrical roller is arranged between two oppositely arranged arc shallow grooves, and the axis of arc shallow groove and cylindrical roller is perpendicular to the sliding direction of handle. Technical effect: with rolling friction to replace traditional sliding friction, reduce 90% mechanical noise, double rubber pad layer, absorb the remaining vibration, millimeter level brake is realized to micro gap positioning technology, eliminate traditional lock " spring abnormal sound " industry pain point of the bottom, especially suitable for the scene with mute demand such as maternity house / study room.

This utility model relates to the technical field of cotton opener accessories, specifically a uniform feeding device for a cotton opener, including a conical discharge port, a rectangular discharge shell, and an upper guide bell mouth. A servo motor is mounted on one end of the rectangular discharge shell via a mounting base, and the output shaft of the servo motor is connected to a rotating shaft via a coupling. A sleeve roller is fitted around the outside of the rotating shaft, and cotton feeding plates are installed at equal intervals on the outside of the sleeve roller via screws. Both the sleeve roller and the cotton feeding plates are located inside the rectangular discharge shell. A discharge pipe is connected to the bottom of the rectangular discharge shell via the conical discharge port, and U-shaped mounting plates are provided on both sides of the discharge pipe. The uniform feeding device for the cotton opener continuously and evenly conveys cotton downwards, and provides a buffering and shock-absorbing effect during operation, reducing mechanical noise caused by excessive vibration.

The application is suitable for the automobile technical field, and provides an audio control method and device of a vehicle and the vehicle. The method comprises the following steps: acquiring driving control data; when the driving control data shows that a target control action of a user is a gear shifting control action, determining target audio data corresponding to the gear shifting control action, and playing the target audio data. The application realizes the following operation: when the driving control data shows that the target control action of the user is the gear shifting control action, the target audio data corresponding to the gear shifting control action is determined and played, the target audio data is played synchronously with the gear shifting control action, the mechanical noise generated in the gear shifting operation process of the vehicle is covered, and therefore the experience of the user in the driving process is improved.

The utility model discloses an electric heating warmer of noise reduction, and the device includes: the warmer shell, be equipped with electric heating element in the warmer shell, electric heating element one side is equipped with fan assembly, the warmer shell is located in one end of fan assembly and is equipped with the air outlet, the warmer shell is located in the opposite end of air outlet and is equipped with the air inlet, the air outlet and air inlet all are equipped with the sound absorption cotton layer and honeycomb formula sound attenuation grid, the inner wall of warmer shell is equipped with the corrugated flow groove. The utility model has the advantages of: the sound absorption cotton layer and honeycomb formula sound attenuation grid that the air outlet and air inlet set, form double -deck sound attenuation structure, effectively reduce the mechanical noise that fan assembly generates and the wind noise that the airflow passes the air hole forms, the corrugated flow groove of warmer shell inner wall changes the airflow direction, breaks the regularity fluctuation of airflow, reduces the vortex generation, further weakens the wind noise and the resonance sound of internal element.

This application relates to a top-blown vaporizer, applied in the field of vaporizers. It includes a vaporizer body with a plurality of heat exchange tubes forming a heat exchange channel. A mounting frame is mounted on the vaporizer body, and a first damping pad is mounted on the mounting frame. A fan is mounted on the first damping pad, with the fan's outlet corresponding to the heat exchange channel. The technical advantages of this application are: the first damping pad absorbs the high-frequency vibrations generated during fan operation, reducing the possibility of vibrations being directly transmitted to the mounting frame and vaporizer body, reducing resonance between the fan and the mounting frame, improving the overall stability of the vaporizer body, and simultaneously reducing the possibility of high-frequency vibrations being transmitted and amplified through rigid connections during fan operation, thus reducing mechanical noise generated by fan vibration.

This invention provides a high-voltage power supply capable of reducing noise, relating to the field of high-voltage power supply technology. It includes a housing, which is a cylindrical structure open at both ends, with a front end plate and a rear end plate at each end; a mounting plate, providing a mounting base for a circuit board, connected to the front end plate and inserted into the housing along its axial direction, with a vibration filtering component between the mounting plate and the front end plate; and a shock-absorbing component, disposed on the inner wall of the housing and comprising two sets that cooperate with both sides of the mounting plate, including two shock-absorbing strips spaced apart on the upper and lower sides of the mounting plate, each strip having an inner cavity. The two shock-absorbing strips are configured to expand when the rear end plate and front end plate are assembled with the housing, contacting the mounting plate to form a shock-absorbing structure. This application achieves multiple vibration suppression through the synergistic effect of the vibration filtering component and the expandable shock-absorbing component, reducing the mechanical noise of the high-voltage power supply during operation from the source, thus achieving a noise reduction effect.

This invention provides an adaptive active noise cancellation device based on bimodal perception, relating to the field of active noise cancellation technology. The device includes a main unit comprising: a microphone array module for acquiring ambient noise signals; an active noise cancellation processing module electrically connected to the microphone array module for real-time processing of the acquired noise signals to generate inverse sound wave signals; and a scene recognition module electrically connected to the microphone array module for real-time analysis of the audio signals acquired by the microphone array and identification of noise types, including at least traffic noise, mechanical noise, water flow noise, and snoring. This invention achieves targeted noise cancellation by using the scene recognition module to identify noise types in real-time and automatically matching the optimal noise cancellation strategy; and by using a position sensing module and various modular bases to achieve adaptive noise cancellation optimization for different placement positions.

The application provides an ice cover thickness detection method and system based on borehole noise imaging, and relates to the technical field of ice cover geological detection. The method comprises the following steps: arranging a two-dimensional linear survey line composed of multiple geophones around a borehole in an ice cover, collecting continuous noise data composed of mechanical noise generated by borehole operation and auxiliary equipment and environmental background noise; pre-processing the continuous noise data, which comprises the following steps: sequentially performing the following processing on the record of each geophone: removing mean value, removing linear trend, removing strong amplitude events in the time domain, and removing strong amplitude components in the frequency domain, so as to eliminate instrument drift and local strong noise interference, and obtaining pre-processed noise data; selecting one geophone in the two-dimensional linear survey line as a virtual source position, performing mutual coherence calculation on the noise data, and recovering a pseudo-shot gather reflection response corresponding to the virtual source. The application realizes high-resolution imaging of the ice-rock interface.

The application relates to a low-noise compensation structure for the installation posture of a ship high-pressure pipeline system pump source operation mode, relates to the field of ship vibration noise control, and comprises a pump group, a balance flexible connecting pipe fixedly connected to the inlet and outlet pipelines of the pump group, a damping platform arranged on the pump group, a vertical adjusting assembly arranged on the damping platform relative to the pump group, and the vertical adjusting assembly limiting the pump group to be in a vertical state. The application has the effects of guaranteeing the low-noise operation posture of the pump group, reducing the inclined displacement of the pump group during operation, reducing the vibration noise of the pump group in the operation state, and reducing the mechanical noise of the ship.

This invention discloses an energy-saving and noise-reducing electric flame stove, comprising: a stove body, a burner discharge assembly, a high-voltage power supply module, and a heat dissipation assembly. This invention utilizes a branched air guide nozzle structure with a converging opening to converge and focus the dispersed airflow output from a low-speed, silent cooling fan, forming a high-pressure, highly concentrated directional cooling airflow. This airflow precisely targets the high-voltage transformer, power drive devices, rectifier filter components, and all core heat-generating components on the control board, significantly improving the utilization rate of the cooling air. The significantly improved cooling efficiency allows the silent cooling fan to operate at a low speed, drastically reducing aerodynamic noise and motor mechanical noise generated by the high-speed rotation of the fan impeller, completely avoiding the high noise problem caused by traditional high-speed fans. Furthermore, this silent cooling fan operates at a constant low speed throughout, without high-speed, high-load operation, significantly reducing fan power consumption, minimizing energy loss, and achieving energy-saving effects.

The present application relates to the engine detection technical field, specifically to a kind of engine knock fault detection method based on vibration signal analysis.Method includes: obtaining the voltage vibration signal and pulse square wave signal of engine and pretreatment, obtain vibration digital sequence and pulse timestamp set;From pulse timestamp set, the difference of adjacent timestamp is extracted as time span, combined with physical mechanical angle interval, rigid body dynamics equation is constructed, instantaneous angular acceleration is calculated, then vibration digital sequence is mapped to crankshaft rotation space, and equal-angle vibration sequence is obtained;Equal-angle vibration sequence is converted in frequency domain and filtered out mechanical noise, and knock residual signal is obtained, the knock characteristic energy in monitoring window is calculated, when exceeding preset safety threshold, control adjustment instruction is issued.The present application restores the mechanical running state under transient variable load, effectively suppresses order ambiguity defect, reduces underlying operation load and response delay.

The application discloses a kind of automobile interior acoustic partition type active noise reduction systems, it is related to loudspeaker field, comprising: configuration module is used to dynamically adjust independent acoustic partition boundary according to in-vehicle seating distribution, occupancy state, and is arranged with the pickup unit and directional sound unit with traceability perception function in each partition;Acquisition module is used to acquire each partition noise signal by pickup unit, and synchronously capture noise source characteristic parameter;The application is dynamically adapted to in-vehicle seating distribution and occupancy state, accurately distinguishes the different characteristics of wind noise, road noise, mechanical noise, effectively separates the noise coupling components of each area, strengthens the noise characteristics of exclusive, generates the noise reduction signal that fits noise source and partition characteristics.

This utility model relates to an improved three-section drawer slide, including an upper rail, a lower rail, and a composite rail disposed between the upper and lower rails. A first ball bearing assembly is provided between the composite rail and the upper rail, and a second ball bearing assembly is provided between the composite rail and the lower rail. A first locking mechanism is provided between the lower right side of the upper rail and the upper right side of the composite rail, and a first limiting mechanism is provided near the lower left side of the upper rail. A second locking mechanism is provided between the upper left side of the lower rail and the lower left side of the composite rail, and a second limiting mechanism is provided near the upper right side of the lower rail. A first installation auxiliary mechanism is provided on the upper rail, a second installation auxiliary mechanism is provided on the lower rail, and an adjustment mechanism is also provided on the upper rail. This solution has a reasonable and thoughtful structural design, is flexible and convenient to use, has low mechanical noise, and provides a good user experience. The three-section drawer slide has the advantages of extending the drawer's opening stroke and improving the stability and structural strength of the three-section drawer slide through the overlapping area of ​​the three sections.

The application provides a high-speed switch valve fault recognition method based on fluid noise and mechanical noise characteristics, which can recognize the fault of the high-speed switch valve in the hydraulic system, first uses a PWM wave to drive the high-speed switch valve, measures the time-domain sound pressure signal of the high-speed switch valve through the sound pressure sensor placed on the side of the high-speed switch valve, and the time-domain sound pressure signal contains the characteristics of the mechanical noise and the fluid noise; compares the maximum value point, the time when the maximum value point appears, the maximum value point and the maximum value point of the theoretical time-domain sound pressure signal with those of the time-domain sound pressure signal of the high-speed switch valve to be tested to determine whether the fault occurs in the high-speed switch valve; and the application can recognize the fault according to the time-domain sound pressure characteristics of the mechanical noise and the fluid noise generated by the movement of the internal components of the high-speed switch valve in the hydraulic system, can analyze the cause of the fault, and improves the fault recognition efficiency.