249 results about "Radial vibration" patented technology

The invention provides a water pump residual life prediction method based on a large model, and the method comprises the following steps: S1, collecting the multi-source heterogeneous data of the operation of a water pump in real time through a vibration sensor, a temperature sensor, a pressure sensor and a monitoring unit, the temperature sensor monitors temperature gradient changes of the bearing and the sealing cavity, the pressure sensor records inlet and outlet pressure fluctuation characteristics, and the monitoring unit extracts three-phase current harmonic components of the motor; s2, carrying out lightweight preprocessing on the multi-source heterogeneous original sensing data at an edge computing node, wherein the lightweight preprocessing comprises vibration signal noise reduction processing based on wavelet transform, temperature and pressure data calibration normalization of load segments according to working conditions, and transient abnormal data flow filtering through a sliding time window; and S3, inputting the preprocessed data stream into a cloud large model platform, and analyzing the long-period dependency relationship of the vibration signals through a Transform encoder in a time sequence feature extraction module.

The invention discloses an ultrasonic-assisted broaching machine tool based on a resonance broach and a design method. The machine tool comprises a broaching machine structure; a groove of the ultrasonic broaching tool is located in the position corresponding to the vibration mode wave crest of the broaching tool; the main piezoelectric actuator device is arranged in the groove; the compensation piezoelectric actuator device is arranged at the position, corresponding to the radial vibration mode, of the ultrasonic broach; the frequency of the ultrasonic power supply and the main power supply is the corresponding frequency when the axial ultrasonic vibration amplitude is maximum and the radial ultrasonic vibration amplitude is minimum under different power supply frequencies, the main driving voltage is determined according to the frequency of the main power supply, the preset broaching maximum speed of the broach and an ultrasonic auxiliary broaching effectiveness coefficient, and the frequency of the compensation power supply is the same as the frequency of the main power supply; the phase difference is 180 degrees, and the compensation driving voltage is the corresponding driving voltage when the ratio of the radial ultrasonic vibration amplitude to the axial ultrasonic vibration amplitude in different driving voltages is smaller than or equal to a preset threshold value. The ultrasonic assistance of the broach which needs to be frequently clamped can be realized.

The invention discloses a rotor unbalance rapid adjustment method based on Kalman filtering, and belongs to the technical field of rotor dynamic balance. According to the method, a rotor rotating speed signal is obtained through a magnetic encoder, and a piezoelectric vibration sensor is triggered to collect a radial vibration signal. In the aspect of signal processing, a zero phase shift filter is adopted to remove noise interference, and an initial phase and an amplitude are extracted by using FFT (Fast Fourier Transform). And calculating a rotating speed change rate based on the sliding time window, and judging whether the rotor is in a steady-state or transient-state working condition. Under the transient working condition, a state space model containing amplitude, phase and rotating speed is constructed, and unbalance adjustment parameters are predicted through Kalman filtering recursion; and under a steady-state working condition, accurately calculating a correction parameter by adopting a least square method. In addition, a least square fitting model based on a sine function is constructed, amplitude estimation is optimized, and the unbalance calculation precision is improved. According to the invention, the unbalance of the rotor can be quickly and accurately adjusted, and the stability and the service life of a rotating system are improved.

The invention provides a driving station state monitoring system for a gravity energy storage transportation track, and relates to the technical field of intelligent control, and the system comprises a calculation module which is used for responding to a primary early warning signal, collecting the real-time oil pressure data of a gear box, a bearing temperature rise rate curve and a dynamic torque feedback value of a target standby driving station, and calculating an availability index; the correction module is used for determining the position of a gearbox input end flange and a driving motor output end coupler as a first monitoring point and the position of connection between a bearing seat and an output shaft as a second monitoring point on a transmission link of the target standby driving station, and respectively calculating the axial temperature gradient difference and the radial vibration energy ratio between the two monitoring points; and generating a dynamic correction value through a preset coupling coefficient, and compensating the availability index based on the dynamic correction value to obtain a corrected index. The operation reliability of the gravity energy storage system can be improved.

The invention provides a self-adaptive robot grinding and polishing machining system and method for a difficult-to-grind complex component, and the machining system comprises a 3D laser scanner which is used for carrying out modeling according to the shape and size of a workpiece, and automatically dividing a grinding region and carrying out self-adaptive path planning according to geometrical characteristics; the mechanical arm is used for clamping a workpiece to move according to a planned path; an abrasive belt floating polishing device; and the grinding device is provided with a self-adaptive grinding and polishing mechanism capable of moving up and down in the axial direction, and the self-adaptive grinding and polishing mechanism is used for conducting constant-force grinding on the workpiece, compensating tool abrasion in real time, conducting radial vibration auxiliary grinding and replacing a grinding head according to requirements. The multi-process combined robot grinding and polishing system can be used for grinding the round corner transition position of a narrow inner concave surface and a stepped right-angle concave surface of a workpiece, self-adaptive process division is carried out on the workpiece according to geometrical characteristics according to the precise grinding requirements of various complex components difficult to grind, and a plurality of devices are integrated together to form the multi-process combined robot grinding and polishing system; and all-dimensional grinding operation on the difficult-to-grind complex component is achieved.

The invention discloses a rotating blade vibration measurement method based on vision, and relates to the technical field of measurement. In order to solve the technical defect that circumferential and radial vibration displacements of a blade cannot be simultaneously and synchronously obtained in a high-speed rotating state in the prior art, the technical scheme provided by the invention is as follows: calculating the time when the blade reaches a preset measurement position based on a non-contact sensor, and respectively triggering a high-speed camera to collect circumferential and radial original images; the method comprises the following steps: performing micro motion amplification processing on an image, tracking pixel movement by using a sparse optical flow algorithm and converting the pixel movement into vibration displacement, and finally performing time domain and frequency domain feature extraction on circumferential and radial vibration data to obtain vibration feature parameters. The method is suitable for online vibration monitoring and analysis work of rotating blades of wind driven generators or aero-engines and the like under the condition of high-speed rotation.

The invention relates to the technical field of flywheel energy storage equipment, in particular to a flywheel rotor dynamic balance self-adaptive adjusting method and system based on magnetorheological fluid. The method comprises the steps that the sealing state of a magnetorheological fluid cavity is detected through a pressure sensor, and it is ensured that the pressure in the cavity is stable and free of leakage; the non-contact displacement sensor executes zero calibration, and output signal fluctuation is controlled within a preset range; carrying out no-load test on a current output port of the self-adaptive control module; when the rotating speed rises from a static state to a preset rotating speed value, a sensor of the real-time monitoring module synchronously collects a radial vibration signal of the rotor, decomposes a fundamental frequency vibration component with the same frequency as the rotating speed, and calculates the amplitude and the phase of the unbalance; when the rotating speed is stabilized in a preset rotating speed interval, the self-adaptive control module enters a closed-loop adjusting state, and when an unbalanced phase is calculated according to detection, a corresponding compensation quadrant fan-shaped cavity is locked, and the current of an electromagnetic coil is adjusted; the problem of traditional adjustment lag is solved, and over-compensation and under-compensation under variable working conditions are avoided.

The utility model discloses a device for detecting the safety performance of a mining belt conveyor. The device comprises a speed sensor, a pressure sensor, a displacement sensor, a tilt angle sensor, a vibration sensor, a weighing sensor, a tension and pressure sensor, a temperature, humidity and atmospheric pressure sensor, a tablet terminal and a computer terminal which are arranged on an underground belt conveyor device. All components of the device are provided with zigbee wireless modules, and each module comprises a high-performance wireless microcontroller with the model of JN5161A and a completely integrated front-end module with the model of RFX2401C. The device for detecting the safety performance of the mining belt conveyor can comprehensively measure and display the speed, the brake oil pressure, the carrier roller displacement, the axial vibration speed, the radial vibration speed, the tension and pressure, the weighing, the angle, the environment temperature, the environment humidity and the atmospheric pressure of the mining belt conveyor. The measurement parameters can be wirelessly sent to a tablet terminal and a computer terminal and displayed in real time through double terminals of an app of a tablet and an upper computer of a computer, and curve graphs and reports can be output, and early warning prompts and the like can be carried out.

The invention discloses an anti-vibration fixing device of a high-voltage foil winding new process dry-type transformer, and relates to the technical field of transformers, the anti-vibration fixing device comprises a supporting base, an adjustable supporting screw rod assembly and a multi-stage elastic damping assembly, the lower end of the adjustable supporting screw rod assembly is connected with the supporting base, and the upper end of the adjustable supporting screw rod assembly is connected with the multi-stage elastic damping assembly; the multi-stage elastic damping assembly is arranged between the adjustable supporting screw assembly and the coil end cover in series and used for absorbing axial vibration generated in the operation process of the coil, and an annular clamping base is installed on the side wall of the coil and used for restraining the radial direction of the coil and absorbing radial vibration. A guide positioning block is installed between the bottom of the coil and the supporting base. By installing the multi-stage elastic damping assembly, the function of segmented absorption and attenuation of coil operation vibration is achieved, the problem that a traditional single elastic element can only work in a limited frequency band and cannot suppress full-frequency-band vibration from dozens of hertz to hundreds of hertz at the same time is solved, the vibration isolation frequency band width is effectively expanded, noise is remarkably reduced, and the vibration isolation effect is improved. And the service lives of the coil and the box body are prolonged.

The invention discloses a multi-signal fusion permanent magnet motor turn-to-turn short circuit fault diagnosis method, which is used for solving the technical problem that turn short is diagnosed only from motor current in the prior art, especially for early turn short diagnosis, the probability of missing report is high, and belongs to the technical field of motor turn-to-turn short circuit fault diagnosis. The three-phase current, the three-phase line voltage and the radial vibration acceleration signal of the bearing area of the bearing end cover of the motor are collected in real time in the operation process of the motor. The method specifically comprises the following steps of 1, current fault feature extraction; step 2, vibration fault feature extraction; s21, vibration spectrum fault feature extraction; s22, vibration envelope spectrum fault feature extraction; s23, calculating a vibration fault feature mark; step 3, turn short online feature mark calculation; 4, judging whether back electromotive force characteristic calculation is started or not; step 5, back electromotive force fault feature extraction; and step 6, final diagnosis of the short turn of the motor.

The invention relates to a distributed optical fiber micro-seismic sensing device and a tunnel monitoring method, and belongs to the technical field of micro-seismic monitoring, the distributed optical fiber micro-seismic sensing device comprises a plurality of vibration measurement sensitization assemblies installed on the same tunnel section, and the plurality of vibration measurement sensitization assemblies are connected through distributed sensing optical cables; distributed sensing optical cables in the vibration measurement sensitization assembly are arranged in the radial direction of the tunnel and used for monitoring vibration signals of hidden and micro crack development of surrounding rock near the tunnel face in the radial direction. During monitoring, the vibration measurement sensibilization assembly at the head end or the tail end of the distributed optical fiber microseismic sensing device is sequentially connected with the distributed optical fiber demodulator, the monitoring host and the monitoring center to form a microseismic sensing monitoring network. The method for monitoring the tunnel by adopting the distributed optical fiber micro-seismic sensing device can realize the axial and radial sensing of the vibration signal, and overcomes the defect that the distributed sensing optical fiber is only sensitive to the axial vibration signal but not sensitive to the radial vibration signal.

The invention relates to an automatic cleaning anti-blocking falling film evaporator, which mainly comprises a spiral power wheel, an anti-blocking pipe orifice bearing bracket, a pipe orifice cleaning steel wire, a steel wire spiral, an intelligent numerical control cabinet, a liquid distribution disc, a spraying hole cleaning steel wire and an intelligent numerical control cabinet. Falling film liquid flow impacts the steel wire spirals to drive radial vibration of hundreds of times per minute and slow rotation of less than 5 revolutions per minute, uniform and automatic cleaning of the heat exchange tubes is achieved, and possible abrasion of the heat exchange tubes is prevented. And the spiral power wheel utilizes the rotating power obtained by a rapid two-phase flow formed by mixing secondary steam at the outlet section of the heat exchange tube and a falling film liquid flow, so that the power for automatically cleaning the steel wire spiral is enhanced. The spraying hole cleaning steel wire and the pipe opening cleaning steel wire are driven to continuously rotate by utilizing the power of liquid flow impulse, so that timely cleaning and blockage prevention are realized. The intelligent numerical control cabinet can automatically adjust the automatic cleaning strength of the steel wire spiral according to the temperature data of the operation of the evaporator, and periodically assists the steel wire spiral which may stop rotating to recover to rotate again. And the reliability of automatic cleaning is improved.

The invention discloses an unmanned underwater vehicle propulsion motor performance degradation device and method based on vibration stress, and the device comprises a vibration stress simulation module, a load simulation module, a motor control module, a water tank, a pedestal and the like. Alternating stress influence of environmental stress such as waves, surges and ocean currents on a main shaft and a bearing of the motor on the unmanned underwater vehicle in water is simulated, and the performance degradation process of the propulsion motor is accelerated; the water tank is filled with seawater, the salinity of the seawater is adjusted, and different sea areas and depths where the propulsion motor is located are simulated; the performance degradation characteristic parameters of the propulsion motor of the unmanned underwater vehicle can be obtained by monitoring the characteristic parameters such as the rotation speed, the power and the vibration frequency of the propulsion motor in real time, and test data support is provided for research of a fault evolution mechanism of the propulsion motor of the unmanned underwater vehicle and construction of a performance degradation model of the propulsion motor.

The invention belongs to the technical field of machining, and particularly relates to an ultrasonic internal broaching broach vibration mode design and control method, which comprises the following steps: firstly, based on a modal isolation structure design method, accurately designing axial and radial vibration modes of a broach so as to meet the requirements of high-precision and high-efficiency broaching machining; a signal processing method based on filtering driving is provided, a designed target vibration mode is accurately driven, the problem that the vibration mode bandwidth of PZT changes along with working conditions such as temperature is solved, finally, due to the fact that the broach frequency vibration mode drifts along with working condition changes in practical application, a dynamic frequency tracking system is developed, and it is ensured that when signals are close to the resonant frequency, the vibration mode bandwidth of the PZT changes along with the working condition changes. The driving frequency can be dynamically adjusted, and it is ensured that the ultrasonic-assisted broaching system is always kept in the target vibration mode. Through optimization and improvement in the three aspects, the ultrasonic vibration broaching effect of the high-strength and high-hardness workpiece is remarkably improved.

The invention discloses a vibration reduction method based on a stator offset auxiliary slot permanent magnet motor. In-depth research on radial electromagnetic force waves causing vibration of the permanent magnet motor finds that the radial electromagnetic force waves are mainly composed of a no-load component and a load component, and a certain phase difference exists between the no-load component and the load component. A stator offset auxiliary slot structure is provided, as shown in figure 1, through optimization of an offset angle bnotch and an offset size Rnotch of the auxiliary slot, a phase difference between a no-load component and a load component of a radial electromagnetic force can be 180 degrees, and the sizes of the no-load component and the load component are similar, so that the amplitude of an electromagnetic force wave can be greatly reduced. The radial vibration acceleration of the motor is weakened by at least 50%. A permanent magnet servo motor system, an automobile electric power steering system, a permanent magnet direct drive wind power generation system and the like can be used.

The invention provides an ultra-deep well large annulus flexible righting transverse vibration reduction method, which belongs to the technical field of well drilling and drilling, and comprises the following steps of: inputting pre-drilling well drilling engineering information, and calculating a whole well section drill string vibration distribution form based on an established drill string finite element dynamic model; the tripping-in positions and the number of the flexible stabilizers and the layer number and the compression space of plate springs in the flexible stabilizers are designed, and an initial vibration reduction scheme is generated; comparing the real-time vibration data with the predicted vibration distribution pattern, carrying out real-time risk assessment, carrying out dynamic optimization on the initial vibration reduction scheme according to the real-time risk assessment, adjusting the tripping-in position and number of flexible stabilizers, the number of plate spring layers and the compression space, and generating an optimized real-time vibration reduction scheme; a flexible stabilizer is put in the designated position of the drill column; when the drill column transversely vibrates and collides with the well wall, the buffer block of the flexible stabilizer is pressed, the plate spring is driven to generate radial elastic deformation, part of radial impact kinetic energy is converted into elastic potential energy of the plate spring to be stored, and radial vibration reduction is achieved.

The invention discloses a vibration reduction assembly and an extremely-low vibration reduction system for an extremely-low-temperature refrigeration platform. The vibration reduction assembly comprises a main frame. The active suppression platform is arranged above the main frame, reads a signal in real time through a sensor in the active suppression platform and feeds back the signal to an internal control unit, and the control unit sends an instruction to reversely adjust the compression amount of an internal spring so as to realize active vibration reduction; the rotary valve vibration reduction mounting seat is used for respectively fixing the rotary valve motor and the phase modulation air reservoir through a supporting plate and a fixed clamping block and realizing vibration reduction through a vibration reduction element arranged in the rotary valve vibration reduction mounting seat; a second vibration reduction body is arranged in the corrugated pipe assembly so as to reduce vibration in the vertical direction and the radial direction. According to the invention, the active suppression platform is arranged to actively eliminate vibration so as to reduce vibration or vibration transmission. The corrugated pipe is arranged above the active restraining platform, vertical vibration of the cold head of the refrigerating machine can be reduced, a plurality of second vibration reduction bodies are arranged on the periphery of the corrugated pipe body, and radial vibration of the cold head of the refrigerating machine can be reduced through the second vibration reduction bodies.

The invention relates to a variable-amplitude hydraulic oscillator, and belongs to the technical field of petroleum and natural gas well drilling matching tools. The tool aims at solving the problems that a traditional hydraulic oscillator is single in vibration mode, and equipment is prone to damage and low in efficiency due to the fact that the amplitude cannot be adjusted. The device structurally comprises a flow conversion short section, an axial vibration short section, a power short section and a radial vibration short section which are connected in sequence. The flow conversion short section achieves switching of a high amplitude mode, a low amplitude mode and a closing mode through the synergistic effect of a hole-shaped piston, a ratchet wheel and a flow channel conversion mandrel and by means of interruption and recovery of fluid flowing. The axial vibration short section adopts a two-stage piston structure to generate efficient axial vibration, the power short section is matched with a dynamic valve plate and a static valve plate through a screw rotor to generate high-frequency pressure pulses, and the radial vibration short section forms transverse vibration by means of centrifugal movement of a pendulum ball. By adjusting the fluid path, the tool can output shock waves of different amplitudes, friction between a drilling tool and the well wall is reduced, and meanwhile fluid pressure is maintained in a closed mode so that clamping stagnation of a pipe column can be avoided. The invention has the beneficial effects of prolonging the service life of equipment, improving the drilling efficiency, reducing the risk of jamming of the drilling tool and adapting to complex formation conditions.

The motor support comprises an annular body, at least two supporting legs and at least two first arc-shaped flanging portions, the annular body is provided with a first face and a second face which are oppositely arranged, at least parts of the supporting legs are located on the side where the first face is located, and the first arc-shaped flanging portions are located on the second face. The first arc-shaped flanging parts are at least partially located on the side where the second face is located, and the at least two first arc-shaped flanging parts and the annular body are enclosed to form a containing part. According to the motor support provided by the utility model, based on the arrangement of the first arc-shaped flanging part, when the motor support is applied to a damping assembly and is connected with a motor, the elastic pad can be arranged in the accommodating part, so that radial vibration generated by the motor is effectively counteracted, and part of axial vibration generated by the motor can be dispersed to the radial direction so as to counteract the axial vibration; the situation that vibration generated in the operation process of the motor is transmitted to the volute through the supporting legs, and then noise is increased is avoided. In this way, the damping effect is improved, and noise is reduced.

This invention discloses a method for evaluating tire vibration index, a tire, and a vehicle. The evaluation method includes: under preset vehicle speed and preset road conditions, measuring and obtaining a first relationship function of the radial vibration force of the left front wheel in the vertical direction with respect to time, and measuring and obtaining a second relationship function of the radial vibration force of the right front wheel in the vertical direction with respect to time; determining the first Fourier series of the first relationship function as the third relationship function, determining the first Fourier series of the second relationship function as the fourth relationship function, and determining the average of the peak-to-peak value of the third relationship function and the peak-to-peak value of the fourth relationship function as the tire vibration index parameter; when the vibration index parameter is less than a preset threshold, the tire vibration index is deemed qualified. This invention can determine the vibration index of the tire that affects the vehicle vibration condition, and based on this vibration index, the tire can be effectively optimized, and production requirements for the tire can be proposed.

The application discloses a kind of thin-walled part double-sided milling processing system dynamics modeling method, the coupling effect between the tool radial vibration and the vibration in the thickness direction of thin-walled part is considered first in the method, the dynamic cutting thickness corresponding to each blade microelement of milling cutter located on the two sides of thin-walled part is calculated, then the dynamic cutting force acting on tool-thin-walled part system is calculated.The cutting force perpendicular to the thickness direction of the two sides of thin-walled part is applied to the milling cutter on the two sides respectively, the resultant force of the cutting force in the thickness direction of thin-walled part is applied to thin-walled part itself, the dynamics control equation of thin-walled part double-sided milling processing system is established, and the stability solution is carried out to the equation.Compared with the given document, the coupling effect between the tool radial vibration and the vibration in the thickness direction of thin-walled part is considered in the application to establish the cutting force and dynamics model of thin-walled part double-sided milling processing system, and the prediction accuracy of thin-walled part double-sided milling stability lobe diagram is improved.

The invention relates to the technical field of hardware fitting laser cutting, and discloses a hardware fitting production laser cutting device which comprises a supporting base assembly, the supporting base assembly comprises a cutting supporting platform, a supporting conveying unit and a discharging hopper, and a metal pipe is horizontally supported in the middle of the top of the cutting supporting platform; a driving rotating assembly and a cutting positioning assembly are arranged at one end of the back face of the top of the cutting supporting platform. According to the laser cutting device for hardware fitting production, through the synergistic effect of the embedded heat dissipation roller unit and the outer heat dissipation roller unit, the machining quality of a copper / aluminum alloy pipe is remarkably optimized, cooling liquid forms vortex through an annular groove of an inner heat dissipation roller and a through hole, synchronous directional spraying of the inner wall and the outer wall of the pipe is achieved, the temperature of a cutting area is rapidly reduced, and the cutting efficiency is improved. The width of a heat affected zone is reduced, the displacement rod structure driven by the cam enables the heat dissipation roller to adapt to different pipe diameters, radial vibration of the pipe is effectively restrained, and the problems of thermal deformation and precision control of high-heat-conduction materials are thoroughly solved.

The invention relates to the technical field of forming of ultra-thin-wall welded pipes, in particular to a forming unit and a forming method of ultra-thin-wall welded pipes, which comprises a rack body and a plurality of groups of vertical forming rollers and transverse forming rollers which are mounted above the rack body and are used for roll forming of welded pipe bodies, a welded pipe body with an extremely thin wall is arranged between the corresponding vertical forming roller and the transverse forming roller, and a supporting frame is installed on the upper portion of the left side of the rack body. According to the forming unit and method for the ultra-thin-wall welded pipe, the inner side wall of the welded pipe body can be expanded and limited through the two cage type stabilizing mechanisms, meanwhile, the transverse forming rollers and the vertical forming rollers at the corresponding positions conduct rolling limiting on the outer side face of the welded pipe body, and therefore the constraint deviation rectifying effect on the welded pipe body with the small wall thickness is improved; radial vibration and transverse deviation of the welded pipe body in the high-frequency welding process can be avoided, and deviation of the roundness of the welded and formed ultra-thin-wall welded pipe body is avoided.

The present application discloses a design method for a multi-physics field coupled shaft-clamped synchronous generator, which relates to the field of shaft-clamped synchronous generators. The method performs discrete sampling within the parameter range of each design parameter of the shaft-clamped synchronous generator to construct multiple sampling combinations. Then, through coupling analysis of the electromagnetic field, structural mechanics field and thermal field, considering the coupling correlation of electromagnetic force, vibration and heat conduction in each physical field, a multi-physics field integrated design comprehensive optimization framework is formed through parametric design to calculate the electromagnetic weight, temperature rise reference value and radial vibration response under each sampling combination. Then, through the Kriging prediction model of these three motor performance parameters, multi-objective optimization is performed based on the optimal comprehensive performance obtained by weighted calculation on the basis of satisfying the constraints, and the performance balance and comprehensive improvement are achieved in terms of vibration control, electromagnetic weight and temperature rise management, thereby ensuring the efficient and stable operation of the shaft-clamped synchronous generator.

The application relates to an ultra-high pressure telescopic oil cylinder for a rotary drilling machine and an assembling method thereof. The ultra-high pressure telescopic oil cylinder comprises a cylinder barrel, a piston rod is arranged in the cylinder barrel and slides in the axial direction, a protective cover is arranged on the piston rod and covers the outside of the cylinder barrel, a plurality of damping assemblies are arranged on the protective cover and are arranged in the length direction of the cylinder barrel, the damping assemblies comprise fixing seats arranged on the outer side wall of the protective cover, a supporting rod is arranged in the fixing seat and slides in the radial direction of the piston rod, a first damping spring is arranged on the outside of the supporting rod, a telescopic rod is further arranged in the fixing seat and is connected with the supporting rod, a roller is rotatably arranged on the telescopic rod, a guide is arranged on the cylinder barrel and is located on the sliding path of the roller, and the guide is used for guiding the roller to move to / from the outer side wall of the cylinder barrel. The application has the effect of effectively relieving the negative influence of the radial vibration of the piston rod of the oil cylinder on the hydraulic system and the performance of equipment.

The utility model provides a shock absorption assembly, motor assembly and range hood, including shock absorption piece and connecting piece, shock absorption piece is attached to connecting piece, shock absorption piece is equipped with convex part, connecting piece is equipped with accommodation groove, convex part is at least partially embedded in the accommodation groove. According to the damping assembly provided by the utility model, as the convex part is at least partially embedded in the accommodating groove, when the damping assembly is applied to the motor assembly, through the interaction of the convex part and the inner surface of the accommodating groove, on one hand, the axial vibration and the radial vibration of the motor can be effectively counteracted, so that the damping effect is well achieved; and on the other hand, the installation of the damping piece can be limited, and the problem that the damping effect is reduced due to the fact that the damping piece deviates between the motor and the connecting piece is solved.

The application discloses a DST test pipe column safety checking method and relates to the technical field of oil and gas field exploration and development. The method comprises the following steps: a pipe column stress distribution model is established according to pressure impact, axial and radial vibration effects in the perforating process; a perforating explosion pressure field is calculated through impact load data of the pipe column at the perforating explosion moment, and spiral buckling evaluation is carried out; a packer stress model in the perforating process is established according to the type of the packer, the safety of the packer under the perforating working condition is analyzed, and packer safety evaluation under the perforating working condition is formed; the pipe column is subjected to the perforating pressure wave and three-direction stress effects, plastic conditions and strength conditions of the fourth strength theory are obtained, and the fourth strength theory is used for pipe column strength calculation and checking; and the pipe column safety in the perforating process is comprehensively evaluated based on the spiral buckling evaluation, the packer safety evaluation and the fourth strength theory calculation result. The method is simple in calculation, convenient in operation and simple and easy to implement in evaluation.

A tool holder, for a tool assembly, comprising a tubular element having a cavity and a central axis; a damping mass arranged within the cavity and movable radially with respect to the central axis and relative to the tubular element; an adapter having a rear part fixed to the tubular element, and a front part for connection to an end effector of the tool assembly, the rear part comprising an opening, and the damping mass is at least partly received in the opening with a radial clearance; and an elastic element positioned between the adapter and the damping mass, the elastic element being arranged to support the damping mass and to damp radial vibrational movements of the damping mass relative to the tubular element, and the elastic element comprising a front surface substantially perpendicular to the central axis and a rear surface substantially perpendicular to the central axis.

The invention relates to the technical field of motor performance test equipment, in particular to performance simulation and test equipment and method for a dual-redundancy motor, and the performance simulation and test equipment for the dual-redundancy motor comprises a base, a mounting frame, a vibration ring, a torque detection unit and a connection socket. The connection socket is fixedly connected with a buckle, the connection socket is provided with a connection interface which is in circuit connection with a detected motor, and the torque detection unit is connected with a rotor of the detected motor and detects the output torque of the detected motor; vibration generated by the radial vibration motor and the axial vibration motor on the vibration ring is transmitted to the mounting ring and the dual-redundancy motor, the vibration of the dual-redundancy motor in the running process when the dual-redundancy motor is mounted on an automobile is simulated, and the position and angle of the vibration transmitted to the dual-redundancy motor are changed by rotating the transmission rod. Therefore, the performance simulation test effect of the invention is improved.

The rotating electrical machine includes: a rotor having a plurality of magnetic poles arranged in a circumferential direction; and a stator having a stator core having a plurality of teeth in the circumferential direction, and a multi-phase stator winding wound around the teeth by concentrated winding. In a rotating electric machine, the number of magnetic poles of a rotor is 18 + / -4 and the number of slots between teeth is 18, or the number of magnetic poles of the rotor is 18 + / -2 and the number of slots between teeth is 18, and skew is applied to a stator or the rotor so as to suppress radial vibration of an eighth harmonic component and a tenth harmonic component.