71 results about "Vibration Problem" patented technology

The invention relates to a vertical high-speed motor active and passive vibration reduction system, which comprises a motor body, a motor base, a controller, a vibration sensor and an integrated active and passive pneumatic damping actuator, and is characterized in that the actuator is arranged between the motor body and the motor base; the vibration sensor is in signal connection with the motor body; the input end of the controller is in signal connection with the vibration sensor, and the output end of the controller is in signal connection with the high-speed switch pneumatic servo valve. According to the vertical high-speed motor active and passive vibration reduction system and vibration reduction method, a controller, a high-speed switch pneumatic servo valve and other components form an active damping system; and the damping pore plate and the auxiliary air chamber jointly form a built-in passive damping system. The passive damping system processes broadband vibration, and active control burden is reduced; and the active damping system achieves accurate suppression, and the overall energy efficiency ratio is increased. The active damping system and the passive damping system work in cooperation to jointly solve the vibration problem, so that the vibration problem of the vertical high-speed motor is rapidly and effectively suppressed.

A variable-speed thin-wall shell turning vibration suppression method is suitable for the problem of turning vibration caused by poor rigidity of a thin-wall shell, belongs to the technical field of machining, and comprises the following steps: step (1), preliminarily determining an optimal turning speed range Smin-Smax of the shell; step (2), preliminarily determining the speed a1 of increasing or decreasing the rotating speed of the main shaft along with the change of the Z-axis point position; (3) if the composition structures of the turning molded surface are various, Z-coordinate theoretical connection points among the composition structures are determined; (4) on the basis of numerical software, the machining method according to the claim 1 is adopted, and respective Z-axis point position reduction rates a2 are set for different composition structures; calculating actual connection point positions among the composition structures, comparing the actual connection point positions with the theoretical connection point positions in the step (3), and modifying a2 to enable the error between the actual connection point positions and the theoretical connection point positions in the step (3) to be within 0.01 mm; and (5) turning is conducted, and the vibration reduction effect is tested.

The invention belongs to the technical field of fans, and particularly discloses a control method and system for an efficient axial flow fan based on the adjustable blade angle, and the method comprises the steps that the air volume, pressure data and environment variables in the operation process of the axial flow fan are collected in real time through a sensor; mapping the collected data into specific demand indexes under different working conditions, wherein the specific demand indexes comprise target air pressure, target air volume and an allowable fluctuation range; according to the obtained variable working condition demand indexes, a fuzzy logic algorithm is adopted to process overall blade angle distribution, and a macroscopic mode of segmented adjustment is determined; initial angle values of adjacent segments are extracted from the determined macroscopic mode, and if it is judged that the difference between the initial angle values exceeds a preset threshold value, an intermediate angle sequence with smooth transition is obtained through interpolation calculation; obtaining an obtained intermediate angle sequence, and applying a neural network model to predict a potential vibration problem for an airflow non-uniform region to obtain an optimized segmented angle correction value; the problem that in the prior art, a draught fan is poor in stability under variable working conditions is solved.

The invention relates to the technical field of communication, in particular to a volume adjustment method, device and equipment of a loudspeaker and a computer readable storage medium. The loudspeaker is arranged in the terminal, an internal cavity of the terminal is a rear cavity of the loudspeaker, and the method comprises the following steps: determining an air pressure value in the rear cavity when the loudspeaker plays an audio signal; when the air pressure value is in the preset interval, the system volume is increased, so that the air pressure value is larger than the maximum value of the preset interval; wherein the preset interval comprises a corresponding air pressure range when the target structure on the terminal resonates under the target volume. As the loudspeaker is provided with the open type rear cavity, the volume of the audio signal played by the loudspeaker can cause the vibration of the air in the rear cavity and can influence the air pressure value, and the air pressure value and the volume have a corresponding relation, when the air pressure is determined to be in the preset interval which is easy to cause resonance, the air pressure value can be increased by increasing the volume, and the resonance can be easily caused. And the shell vibration problem caused by the resonance phenomenon is avoided.

The invention discloses a strong impact load operation robot tail end vibration suppression method, which comprises the following steps: taking transmission mechanism data and tail end vibration measured by a combined force-visual sensor as input in an impact operation process of a robot, preprocessing, and then adopting a model driving and data driving method to establish a prediction model of the robot tail end vibration. Model predictive control (MPC) is adopted, closed-loop control is conducted on tail end vibration of the robot in each control period, active disturbance rejection control (ADRC) is introduced to restrain nonlinear discontinuous vibration generated in the impact process, and active vibration restraining in the impact process is achieved. And detecting the vibration of the tail end of the robot after suppression, and proportionally compensating suppression errors in the next corresponding impact process by using a self-learning method. And after multiple times of compensation tends to be stable, a compensation curve is recorded and called in the subsequent impact process. According to the method, the nonlinear and discontinuous vibration problems of the tail end of the impact load operation robot can be effectively solved, and the operation stability of the impact robot is improved.

The present application relates to the field of gas turbine technology, and more particularly to a dynamic balancing method for the misalignment vibration problem of a gas turbine unit shaft system, which comprises the following steps in sequence: step A, implementing a first dynamic balancing weight scheme on a first weight plane of the gas turbine rotor; and step B, implementing a second dynamic balancing weight scheme on a second weight plane of the gas turbine rotor, wherein the weight angle of the second dynamic balancing weight scheme is 180 degrees different from the weight angle of the first dynamic balancing weight scheme. The dynamic balancing method for the misalignment vibration problem of the gas turbine unit shaft system according to the present application selects two weight planes to implement opposite weight, and the generated weight bending moment can balance the additional bending moment, so that the vibration condition of the unit is obviously improved. Different from the traditional influence coefficient method, the dynamic balancing method according to the present application directly attacks the essence of the vibration problem, reduces the number of starting machines and the resulting psychological pressure, saves considerable test cost, and has good application effect and promotional value.

The invention relates to a natural gas boiler noise reduction method and a vibration suppression device in the technical field of natural gas boilers, the noise reduction method comprises the steps S1 to S5, and the vibration suppression device comprises a sensing and diagnosis module, an active control module, a passive treatment module and a central processing and closed-loop optimization unit. According to the technical scheme, dynamic, multi-target collaborative and closed-loop optimization is realized based on a data model and a collaborative technology; the problem of sound source accuracy is solved through multi-source sensing and intelligent diagnosis in the steps S1-S2, the problems of effectiveness and collaboration are solved through active and passive multi-physics field cooperative control in the steps S3-S5, and the problems of adaptability and long-term effectiveness are solved through a device-based central closed-loop optimization unit. Therefore, fundamental, intelligent and systematic treatment of noise and vibration problems of the natural gas boiler is realized.

The utility model relates to a tool for milling an outer side rib of a machine shell, which not only can improve the machining efficiency of the machine shell, but also can reduce the labor intensity of workers, simultaneously can ensure the machining quality, and can prevent a cutter vibration phenomenon when the machine shell is machined by a vertical machining center. A circular through hole is formed in a vertical plate in the mounting seat, and a pin through hole penetrating through the front and back surfaces of the vertical plate is formed in the vertical plate; the rotating disc is composed of a first cylindrical section, a second cylindrical section and a third cylindrical section, the first cylindrical section is arranged on one side of the second cylindrical section, and the third cylindrical section is arranged on the other side of the second cylindrical section; a machine shell to be machined is rotatably installed between the two installation bases through the two rotary discs, and limiting pins are inserted after the pin through holes and the corresponding threaded holes are communicated. The tool has the advantages that the tool not only can improve the machining efficiency of the machine shell, but also can reduce the labor intensity of workers; and secondly, not only is the machining quality guaranteed, but also the cutter vibration problem can be prevented.

The application discloses a tubular vortex reducer and an aero-engine, and aims at weakening the vibration problem existing in the tubular vortex reducer, improving the stability and the drag reduction effect. The technical scheme is as follows: the tubular vortex reducer comprises a vortex reduction pipe, a support ring and a damping sheet. The vortex reduction pipe is arranged in the installation hole of the support ring and is fixed by a clamping ring, is used for guiding the airflow to flow to the shaft center from the air inlet hole on the first stage disc; the support ring is a hollow annular structure, is coaxial with the rotor disc, and is used for installing the vortex reduction pipe; the clamping ring is used for fixing the bottom of the vortex reduction pipe between the clamping ring and the support ring, and prevents the vortex reduction pipe from moving along the installation hole to the shaft center of the support ring; the damping sheet is a circular arc sheet structure, is sleeved into the top of the vortex reduction pipe during installation, the center of the damping sheet is provided with a circular hole with the same diameter as the outer cylindrical surface of the vortex reduction pipe, the radial position of the annular damping structure relative to the vortex reduction pipe is set by setting the circular arc radius of the damping sheet; and the fastener is used for fixing the support ring and connecting the damping sheet.

The invention discloses an internal expansion type numerical control lathe fixture for a thin-walled cylinder workpiece. The internal expansion type numerical control lathe fixture comprises a chuck body, a fixture body, a positioning cover, an expansion sleeve, a locking block and a locking wrench, the other end of the chuck body is connected with the clamp body; the positioning cover is connected with the clamp body, and the outer surface of the positioning cover makes contact with the outer surface of a workpiece to achieve workpiece positioning. The expansion sleeve is in conical fit with the clamp body, and the expansion sleeve expands to enable the outer surface of the expansion sleeve to make contact with a workpiece so as to abut against and clamp the workpiece; the locking block is connected with the expansion sleeve, the locking block is in threaded connection with the clamp body, and the expansion sleeve is controlled to be expanded and shrunk through rotation of the locking block; and the locking wrench is connected with the locking block. The expansion sleeve is matched with the conical surface of the clamp body, expansion of the expansion sleeve is controlled through threaded connection of the locking block, the thin-wall cylindrical workpiece is clamped by the expansion sleeve, the deformation of the part is reduced, the form and location tolerance of the part is guaranteed, the problem of machining vibration of the thin-wall workpiece is solved, and the machining efficiency and the machining quality of the part are greatly improved.

The present application relates to rail transit vibration reduction technical field, especially to a kind of vibration reduction system for station bridge integration structure key position, including the key position damping mechanism located below conversion beam and above load-bearing column, the key position damping mechanism is located between conversion beam and load-bearing column, the key position damping mechanism includes main force support, auxiliary force support, the main force support is located in the axial direction of supporting bridge pier conversion beam node position, to bear the vibration load transmitted by bridge pier, upper auxiliary force support is supported at six node positions of the main load-bearing position of conversion beam, indirectly bear the upper vibration load dispersed by conversion beam;The present application is strong, and development prospect is good.With more and more large urban traffic hubs that integrate multiple traffic load forms in one body in domestic completion, the vibration problem of station bridge integration structure highlights, and the present application device system is specially proposed for this problem.

The application discloses a workpiece vibration suppression structure for cutting machining and a balance adjusting method thereof, and relates to the technical field of cutting machining.The workpiece vibration suppression structure comprises a vibration acquisition module, a rotating speed detection module, a data processing module, a display and early warning module and a communication module; the vibration acquisition module acquires a workpiece vibration signal; the rotating speed detection module detects the rotating speed of a main shaft and calculates a cutting speed; the data processing module analyzes the correlation between the cutting speed and vibration intensity, compares a preset threshold value, and realizes early warning; and the communication module realizes signal transmission with an external execution mechanism.The adjusting method dynamically solves the vibration problem caused by unreasonable cutting speed through initialization setting, real-time data acquisition, data processing analysis, cutting speed adjustment or mechanical balance adjustment.The application can realize real-time monitoring of vibration and cutting speed in the cutting process, accurate positioning of vibration causes, dynamic adjustment of machining balance, improvement of machining quality and efficiency, and prolongation of the service life of equipment.

The invention discloses a dynamic stability augmentation method for a rotor system of a centrifugal compressor, the rotor system comprises a rotor part, a bearing part and a sealing part, and the dynamic stability augmentation method comprises the following steps: establishing a finite element analysis model of a rotor-bearing system based on a design scheme of the rotor part and the bearing part; optimizing a rotor part and a bearing part based on a finite element analysis model; establishing a finite element analysis model of the rotor-bearing-sealing system based on the rotor part, the bearing part and the sealing part; optimizing a sealing element based on the rotor-bearing-sealing system model; and obtaining the rotor system after power stability augmentation. By optimizing each part in the rotor system, namely the rotor part, the bearing part and the sealing part, on one hand, the dynamic stability of the rotor system can be effectively improved, and on the other hand, the vibration problems such as collision and abrasion of the rotor and the stator can be avoided.

The invention belongs to the technical field of floating tunnel vortex-induced vibration suppression, and discloses a floating tunnel vortex-induced vibration suppression method based on a tuned mass damper. According to the method, suppression measures are taken for the vortex-induced vibration problem of the floating tunnel, the tuned mass damper is applied to the floating tunnel, energy generated by vortex-induced vibration of the floating tunnel is absorbed and dissipated, and the purpose of weakening the vortex-induced vibration of the floating tunnel is achieved. According to the method, the problems of tunnel structure deformation and fatigue failure caused by the vortex-induced vibration of the floating tunnel can be effectively avoided, and the vortex-induced vibration of the floating tunnel is effectively inhibited. Due to the fact that the tuned mass damper has the advantages of being simple in structural form, low in manufacturing cost and the like, the construction cost of the floating tunnel can be greatly saved, the construction cost is greatly reduced, and good social and economic values are created.

The invention discloses a suspension bridge construction wind resistance mode which comprises the steps that classified wind resistance is conducted through a catwalk structure, a hoisting system, a stiffening beam, a construction simulation test device and control measures, and all components can resist wind singly or cooperatively; the catwalk structure is arranged in a bridge construction area, and the catwalk structure comprises a wind-resistant system; the stiffening beam is arranged above the catwalk structure, and dynamic characteristic analysis is carried out on the stiffening beam in the construction process so as to control vibration; the hoisting system is connected with the catwalk structure and the stiffening beam and used for hoisting the stiffening beam, and the hoisting system conducts wind-induced vibration response research on the stiffening beam section in the hoisting process in the typhoon period; by means of the systematic wind-resistant design, the wind-induced vibration problem in the construction process of the large-span suspension bridge is solved, construction safety is guaranteed, a construction organization scheme is optimized, and remarkable technical progress and practical value are achieved.

This invention discloses a combined ammonia synthesis heat recovery device and method that is vibration-resistant, hydrogen corrosion-resistant, and operates under high temperature and high pressure. The ammonia synthesis heat recovery device includes a waste heat boiler and a boiler feedwater heater. The waste heat boiler includes a furnace shell, a furnace cavity, and a steam outlet pipe. The boiler feedwater heater includes a heat exchanger shell, heat exchange tubes, a left end cap, and a right end cap. The heat exchanger shell is composed of a left cylindrical section, a middle cylindrical section, and a right cylindrical section connected in sequence. The middle cylindrical section is axially fixed inside the furnace shell by a fixing plate assembly. It has an outlet at the top and an inlet at the bottom, and both the outlet and inlet communicate with the furnace cavity. This invention combines the boiler feedwater heater and the waste heat boiler into one unit, eliminating the need for a heated boiler feedwater pipeline, reducing heat loss in the pipeline, and improving heat exchange efficiency. It also solves the vibration problem caused by vaporization in the boiler feedwater pipeline.

This application discloses a disturbance control method, device, refrigerator, and storage medium, relating to the field of motor control technology. The method includes: performing spectral analysis on the original disturbance signal of the compressor to determine the fundamental frequency and signal type of the original disturbance signal; determining a target suppression signal based on the signal suppression strategy corresponding to the signal type, the fundamental frequency, and the original disturbance signal; and performing disturbance control on the compressor based on the target suppression signal. Through this method, the original disturbance signal is processed and suppressed using signal suppression strategies corresponding to different signal types. Based on the suppressed signal, the system achieves effective control of various types of periodic vibrations, successfully addressing vibration problems caused by external disturbances to the compressor, thereby significantly improving the overall performance of the equipment.

The utility model discloses a detachable mould for improving underground structure side wall slope paragraph water stop effect, including water stop steel sheet, water stop steel sheet end head cover, a plurality of segment baffle, the inclination angle of water stop steel sheet placement is consistent with the inclination angle of side wall slope section, water stop steel sheet end head cover is equipped with water stop steel sheet top, and a plurality of interval 40 50 centimeters segment baffle are fixed through the nail shooting, and then water stop steel sheet is fixed in the intermediate position of side wall inclination plane, and the horizontal plate extension direction of each segment baffle is parallel with the inclination plane of side wall, forms the flow restriction channel. The present application solves the problem of high water stop steel sheet deviation rate, increased water seepage path and poor self-waterproof effect of main structure in the construction of traditional method in inclined section, and the mould is convenient to disassemble, and the vibration problem is solved simultaneously by using the baffle gap.

The invention discloses a method for analyzing and optimizing a battery rack structure of a mobile energy storage vehicle through random vibration response. The core of the method is to provide a directional specificity collaborative optimization method for a multi-axis random vibration coupling effect of a battery rack under a complex road condition. According to the method, through modal-random vibration coupling simulation, differential failure mechanisms in all directions are accurately identified and distinguished; a multi-objective optimization model with resonance suppression and stress control as performance objectives and structural weight as cost objectives is constructed, and an optimal balance scheme of performance and light weight is obtained; on the basis, intelligent distribution of the material on a key force transmission path and accurate, efficient and systematic design of the vibration problem of the battery rack are realized, and the safety and reliability of the solid-state battery in a mobile energy storage scene are improved.

The invention discloses a flexible metal binding belt type damping device suitable for thin-wall long shaft part machining, which comprises metal bars, a binding belt and a lining layer, a plurality of metal bars with equal diameter and equal length are annularly arranged in the circumferential direction of a workpiece damping part, and the lining layer is arranged between the annularly arranged metal bars and the workpiece damping part. And the outer sides of the annularly arranged metal bars are tightly bundled by a bundling belt. According to the principle that the metal layer is additionally arranged on the thin-wall part of the workpiece to increase rigidity and reduce machining vibration, the vibration reduction device is designed, preparation is easy, installation is convenient, the wrapping position is flexible, machining and positioning of the workpiece are not affected, and a new solution is provided for solving the machining vibration problem of the thin-wall workpiece.

The application relates to a design method of a brake disc assembly for an airplane, and belongs to the field of airplane brakes. In view of the 10-20 Hz vibration problem caused by the high impact load of 750 kN or above during airplane landing, a triple vibration suppression technical scheme is provided: Y-shaped damping holes are arranged on a static disc, the nodes are located on a graduation circle, and nano aerogel porous materials are filled; lotus-shaped damping holes are arranged on a dynamic disc, obtuse angle nodes are matched with the graduation circle, and nano aerogel porous materials are filled; a carbon fiber damping sleeve (dynamic disc) and a U-shaped damping net (static disc) are additionally arranged on a key groove boss. The friction pair number, the graduation circle and the brake force action point are limited; and the graphitization degree of the carbon brake material is controlled to be 55%-65%, and the uniformity of the heat treatment furnace temperature is less than or equal to + / - 20 DEG C. The vibration amplitude of the brake disc assembly designed by the method is reduced by 84%, the convergence time is shortened by 75%, and the reliability requirement under extreme working conditions is met.

The application discloses a sealing valve mechanism and a semiconductor processing equipment, and belongs to the technical field of valve mechanisms.The sealing valve mechanism comprises a valve body and a valve plate unit.The valve body is provided with a valve port.The valve plate unit comprises a fixing frame, a valve plate, a first movable seat, a second movable seat, a swing arm, an elastic piece and a driving device.The sealing valve mechanism of the application realizes smooth closing and flexible sealing of the valve plate through stage-by-stage motion control, and effectively overcomes the vibration problem caused by rigid impact in the prior art.

The application belongs to the technical field of punch, in particular to a dynamic balancing device and a shockproof high-speed precision punch, which comprises a guide block, a gravity block and a balancing mechanism, the guide block is installed in the body of the punch, the gravity block is suitable for connecting the dynamic balancing connecting rod mechanism of the punch, the gravity block is slidingly connected in the interior of the guide block, the balancing mechanism is installed in the interior of the body and close to the position of the gravity block, in the process of the dynamic balancing connecting rod mechanism driving the gravity block to move, the gravity block extrudes the balancing mechanism, so that the gravity block overcomes the dynamic balancing resistance of the balancing block and continues to move at the moment of stamping semi-finished product, better dynamic balancing effect of the punch crankshaft is realized, the device is suitable for high-speed precision punch, and the vibration problem caused by the moment of stamping semi-finished product can be further reduced due to the elastic force of the elastic member.

The invention belongs to the technical field of floating tunnel vortex-induced vibration suppression, and discloses a floating tunnel vortex-induced vibration suppression method based on a jet flow control technology. According to the method, suppression measures are taken for the vortex-induced vibration problem of the floating tunnel, the jet flow control technology is applied to the floating tunnel, the vortex falling-off mode is changed through externally input energy, the lift force borne by the floating tunnel is reduced, and the vortex-induced vibration of the floating tunnel is suppressed. Vortex-induced vibration of the floating tunnel can be effectively restrained, and guarantee is provided for safe operation of the floating tunnel. Meanwhile, the jet flow control technology is simple in structural form, high in controllability and capable of being flexibly applied to complex sea conditions, construction and operation cost of the floating tunnel is greatly saved, construction cost is greatly reduced, and good social and economic value is created.

The embodiment of the invention provides a method for solving the vibration problem of a molten salt pipeline and a molten salt pipeline mechanism. According to the method, the exhaust function is achieved by installing an electric adjusting valve and an electric exhaust valve and providing a proper installation position; the device can effectively solve the problem of strong vibration of the fused salt pipeline caused by large height difference, incapability of exhausting and the like of the fused salt pipeline entering the storage tank, and has the advantages of simplicity in operation, thoroughness in exhausting, low cost and simplicity in operation and maintenance, so that the field noise is reduced, and the safety of the fused salt pipeline and equipment connected with the fused salt pipeline is remarkably improved.

This utility model discloses a chain clamp anti-vibration device for a film transverse stretching machine, comprising: a positioning block connected to the chain; and a structure and connection relationship of the positioning block, slider, guide rail, elastic adaptive component, and rigid guide component, which can effectively alleviate the impact and vibration problem when the chain clamp passes through the track joint. The positioning block is connected to the chain, and the slider is fixed to one side of the positioning block and slidably connected to the guide rail. This structure provides basic movement guidance for the chain clamp. The elastic adaptive component is connected between the top of the slider and the chain clamp. When the guide wheel of the slider passes through the guide rail joint and generates an instantaneous impact, the elastic adaptive component can absorb the impact energy using its own elastic characteristics. The rigid guide component is connected to the top of the chain clamp, which can further constrain and guide the movement direction of the chain clamp, ensuring that the chain clamp always maintains the correct movement trajectory during transverse stretching, thereby improving the quality stability of the film product.

The present disclosure relates to a kind of water turbine generator set vibration frequency measuring device and measuring method, the water turbine generator set vibration frequency measuring device includes upper rack, horizontal vibration frequency measuring mechanism and vertical vibration frequency measuring mechanism, upper rack is used to be connected with water turbine generator set, horizontal vibration frequency measuring mechanism is arranged on upper rack, horizontal vibration frequency measuring mechanism is used to measure the horizontal vibration frequency of upper rack, to indirectly measure the horizontal vibration frequency of water turbine generator set, vertical vibration frequency measuring mechanism is arranged with upper rack interval, vertical vibration frequency measuring mechanism is used to measure the vertical vibration frequency of upper rack, to indirectly measure the vertical vibration frequency of water turbine generator set.The present disclosure can effectively obtain the direct influence of vibration frequency on water turbine generator set by measuring the horizontal vibration frequency and vertical vibration frequency of water turbine generator set, so as to accurately find out the reason of unit vibration, provide basis for solving unit vibration problem.

The invention discloses a workpiece vibration suppression structure for cutting machining and a balance adjustment method thereof, and relates to the technical field of cutting machining, the workpiece vibration suppression structure comprises a vibration acquisition module, a rotating speed detection module, a data processing module, a display early warning module and a communication module; the vibration acquisition module acquires workpiece vibration signals, the rotating speed detection module detects the rotating speed of a main shaft and calculates the cutting speed, the data processing module analyzes the incidence relation between the cutting speed and the vibration intensity and compares a preset threshold value to achieve early warning, and the communication module achieves signal transmission with an external execution mechanism. According to the adjusting method, the vibration problem caused by the unreasonable cutting speed is dynamically solved through initialization setting, real-time data collection, data processing and analysis and cutting speed adjustment or mechanical balance adjustment. Vibration and the cutting speed in the cutting process can be monitored in real time, vibration inducements are accurately positioned, machining balance is achieved through dynamic adjustment, the machining quality and efficiency are improved, and the service life of equipment is prolonged.

The utility model discloses a water conservancy project gate belongs to water conservancy engineering technical field, including valve stem and gate and gate seat, the top center position of gate seat is provided with threaded hole, and valve stem is connected with threaded hole screw thread, and the top of valve stem is fixedly connected with hand wheel, the utility model discloses can have water flow dispersion structure, so water flow impact force no longer concentrates, avoids local stress too big, avoids gate vibration, deformation damage, avoids conventional single bearing structure, so will not local stress concentration, also can not cause bearing wear and gate deviation, also can not reduce the stability of gate, can also effectively disperse water flow impact force, has eliminated the eddy current and vibration problem, has improved the service life of gate.

This invention belongs to the technical field of micro-vibration control and discloses a three-level micro-vibration isolation system and method combining active and passive vibration control. The system includes a controlled structure, an active control unit, and a passive control unit. The active and passive control units work together to form three-level micro-vibration control for the controlled unit. The passive control unit includes a first passive control module and a second passive control module. The first passive control module includes a shell, a negative stiffness damper, and a suspension cable. The suspension cable connects the controlled structure and the shell. The suspension cable, damper, and controlled structure together form a long-period pendulum structure to filter out mid-to-high frequency micro-vibrations relative to its oscillation period. The second passive control module provides vertical passive vibration isolation to filter out three-dimensional low-frequency micro-vibrations. The active control unit compensates for vibrations caused by ground-level micro-vibrations. This invention solves the problem of low-frequency and high-frequency micro-vibrations in space optical equipment.