201 results about "Radial vibration" patented technology

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 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 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 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 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 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 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 application provides a damping foot pad, a compressor and a refrigeration and heating device. The damping foot pad comprises a shell with an inner cavity, a shaft core, a sheet spring, an eddy current damping mechanism for damping axial vibration of the shaft core, and a magnetic damping mechanism; the magnetic damping mechanism comprises an inner magnetic ring and an outer magnetic ring for generating magnetic repulsion to the inner magnetic ring in the direction of the shaft core. The damping foot pad of the application damps the axial vibration of the shaft core by setting the eddy current damping mechanism, sets the inner magnetic ring on the shaft core, and sets the outer magnetic ring coaxially around the inner magnetic ring. Since the eddy current damping mechanism and the magnetic damping mechanism have very small stiffness close to zero at the start of vibration, quasi-zero stiffness damping is formed, the axial and radial vibration isolation frequency ranges of the damping foot pad are wide, good axial and radial vibration isolation can be achieved, and the vibration isolation effect is good.

The vibration reduction and isolation bearing supporting structure comprises a bearing mounting sleeve, a vibration reduction and isolation layer, a supporting fixing ring, a vibration suppression adjusting layer and a limiting strip. A plurality of groups of strip-shaped bosses are uniformly arranged on the peripheral wall of the bearing mounting sleeve at intervals, and a space groove is formed between every two adjacent strip-shaped bosses; each vibration reduction and isolation layer is fixed on one group of strip-shaped bosses; the inner circumferential wall of the supporting and fixing ring is fixed to the multiple vibration reduction and isolation layers. Each vibration suppression adjusting layer is arranged between one vibration reduction and isolation layer and the supporting and fixing ring; each limiting strip is arranged in one space groove, the outer end of each limiting strip is fixedly connected with the supporting and fixing ring, and the inner end of each limiting strip extends in the radial direction of the transmission shaft; the vibration reduction and isolation layer sequentially comprises an inner-layer low-frequency vibration reduction and isolation layer, a middle-layer medium-frequency vibration reduction and isolation layer and an outer-layer high-frequency vibration reduction and isolation layer from inside to outside in the radial direction of the transmission shaft. The radial vibration attenuation of the transmission shaft of the water surface ship can be effectively realized on the basis of keeping the overall structure stable.

The present application relates to a kind of distributed optical fiber microseismic sensing device and tunnel monitoring method, belong to microseismic monitoring technical field, distributed optical fiber microseismic sensing device includes multiple installation in the same tunnel section vibration measurement sensitizing component, multiple vibration measurement sensitizing component is connected by distributed sensing optical cable;Distributed sensing optical cable in vibration measurement sensitizing component is arranged along tunnel radial, for monitoring the vibration signal of the development of the hidden crack and micro crack of surrounding rock along radial near working face.In monitoring, the first end or tail end of distributed optical fiber microseismic sensing device one vibration measurement sensitizing component is sequentially connected with distributed optical fiber demodulator, monitoring host and monitoring center, and constitutes microseismic sensing monitoring network.The method for tunnel monitoring using the above-mentioned distributed optical fiber microseismic sensing device can realize the perception of vibration signal along axial and along radial, overcome the defect that distributed sensing optical fiber is only sensitive to axial vibration signal and not sensitive to radial vibration signal.

The utility model relates to the technical field of stirring equipment, and discloses a mixing stirrer capable of preventing leakage, which comprises a main body cylinder and a top plate, the top plate is fixedly arranged at the upper end of the main body cylinder, an annular chute is arranged at the lower end of the top plate, a motor is fixedly arranged at the center of the lower end surface of the top plate, and a long rod is fixedly arranged at the output end of the motor. A stable frame is fixedly arranged at the position, close to the upper end, of a rod body of the long rod in a sleeving mode, sliding blocks are fixedly arranged at the two ends of the stable frame respectively, pulleys are fixedly arranged on the inner sides of the two sliding blocks respectively, the two sliding blocks are slidably arranged in the annular sliding grooves respectively, and the two pulleys slide on the inner side walls of the annular sliding grooves respectively. According to the stirring device, the long rod rotates to drive the stabilizing frame to rotate, so that the stabilizing frame drives the sliding block to roll in the annular sliding groove and slide along the inner side of the sliding groove in cooperation with the pulley to form a multi-point supporting structure, the radial vibration of the long rod and the stirring blades is effectively reduced, and the stability in the stirring process is improved.

The invention relates to the technical field of stirring paddles, in particular to a uniform mixing bioreactor stirring paddle which comprises a column body, the rotating shaft is rotationally connected into the column body; through the innovative composite design of a double-layer differential transmission mechanism and vibration stirring, three-dimensional chaotic mixing is realized, and the mixing efficiency and quality are remarkably improved; the upper-layer first rotating mechanism drives a plurality of first stirring paddles to rotate at a set speed through a gear train formed by a first gear ring, a first gear and a second gear ring; the second rotating mechanism at the lower layer drives a second stirring paddle through another independent gear system, slides in a corrugated groove with a specific angle through a T-shaped block, and generates periodic radial vibration in combination with an elastic component; the rotation-vibration composite motion breaks the flow field symmetry of traditional one-way stirring, can effectively eliminate a mixing dead zone, enables nutrient substances, dissolved oxygen and cells to be highly uniformly distributed, and is especially suitable for a high-density and high-viscosity culture system.

The application discloses a multi-bearing segmented flywheel energy storage device, which comprises an upper bearing, a lower bearing, a middle bearing, a shell, a rotating shaft, a first flywheel and a second flywheel. The two flywheels are arranged on the rotating shaft, the shell is arranged outside the flywheels and the rotating shaft, the upper bearing and the lower bearing are arranged at two ends of the rotating shaft, the middle bearing is arranged on the rotating shaft between the two flywheels, and the middle bearing is arranged between the shell and the rotating shaft. The first flywheel is integrally formed with the rotating shaft, and the second flywheel is detachably connected with the rotating shaft. The application is used to solve the problem of excessive radial vibration caused by the first critical speed being too low due to the large axial span of the flywheel. The flywheel body with large thickness is divided into two parts, which is beneficial to the uniformity of the heat treatment of the flywheel body. The radial strength of the rotating shaft of the flywheel body is improved by additionally arranging a bearing between the two flywheel bodies. In order to facilitate the installation of the bearing at the middle position of the flywheel, the segmented flywheel rotating shaft and the matched shell are designed.

The application relates to a robot milling semi-active vibration suppression end effector and a control method based on an MRF-MRE hybrid medium, which comprises a hybrid medium system constructed in parallel with a magneto-rheological fluid and a magneto-rheological elastomer, controllable energy dissipation damping provided by the MRF filled in a shearing gap, variable dynamic stiffness provided by the MRE as a supporting element, tracking adjustment of an inherent frequency and independent suppression of a vibration amplitude realized through differential or common-mode magnetic fields generated by double excitation coils, and a heat-magnetic compensation mechanism based on impedance monitoring of the excitation coils, which effectively solves the performance drift problem in long-time machining. The end effector adopts a non-rotating design, the mover assembly is radially vibrated with the cutter but not rotated with the cutter through the antifriction bushing, and the reliability and sealing life in the high-speed milling working condition are remarkably improved.

The invention belongs to the field of aerospace transmission, and discloses a floating spline rigidity damping parameter identification device and identification method. The recognition device comprises a fixed support, a floating spline test piece, a supporting bearing seat, a rotating shaft and a torque loading system. The inner spline shaft and the outer spline shaft are rigidly connected through an expansion sleeve and a connecting disc and achieve spline meshing, the outer spline shaft is connected with a rotating shaft through a diaphragm coupling, and the rotating shaft is provided with a balance weight disc, a bearing and a positioning clamp spring and connected with a torque measuring instrument. The torque increasing shaft is connected with a torque measuring instrument through a diaphragm coupling, and loading torque is applied by a bidirectionally symmetrical spring force arm system, so that controllable loading is realized. The device is provided with an acceleration sensor to collect axial and radial vibration signals, and excitation can be applied through the horizontal and vertical vibration exciters. The floating spline rigidity damping parameter identification device and the identification method have the advantages of simple structure and simple and convenient implementation mode, and are high in repeatability and high in identification precision.

The application discloses a ship engine room infrared thermal image and vibration combined diagnosis method based on a multi-mode, relates to the technical field of mechanical equipment state monitoring, and synchronously collects infrared thermal image data and vibration data of a contact area between a bearing seat and a mounting base structure in an engine room operation process, forms an infrared thermal imaging frame sequence and a vibration signal data sequence through data processing; constructs a contact area thermal image sequence and a radial vibration attenuation sequence according to the infrared thermal imaging frame sequence and the vibration signal data sequence, and maps to a unified time axis for consistency determination; aggregates time sub-sections with inconsistent evolution rhythms to form a thermal-vibration response deviation trend, judges the thermal-vibration response deviation trend, and outputs thermal-vibration response deviation results of the contact area. The method is suitable for positioning and discriminating abnormal contact between a bearing seat and a mounting base of a ship engine room through time sequence correlation analysis of thermal image information and vibration information for combined identification of the structure contact state.

This invention discloses a vibration suppression device for a positive displacement vane pump and its motor, belonging to the field of vibration suppression technology. The damping and vibration reduction assembly includes a rotating box, inside which a horizontally arranged support column is connected. Two symmetrically arranged inner rings are connected to the outer periphery of the support column. An outer ring is coaxially arranged on the outer periphery of each inner ring. Multiple buffer springs arranged in a circular array are connected between the outer and inner rings. Multiple buffer balls arranged in a circular array along the axis of the support column are arranged between the two outer rings. In this invention, by setting a multi-degree-of-freedom buffer mechanism composed of inner rings, outer rings, buffer springs, damping telescopic rods, and buffer balls inside the rotating box, axial and radial vibrations generated during the main shaft transmission can be absorbed in all directions. Utilizing the elastic deformation of the buffer springs and the slow rebound characteristics of the damping telescopic rods, the vibration suppression effect is significantly improved, ensuring the smoothness and reliability of the transmission system operation.

The application belongs to the technical field of vector hydrophone, and particularly relates to a kind of column barrier under vector circular array element domain sound pressure vibration velocity joint anti-interference beam forming method, according to the model of vector circular array under cylindrical barrier plate, the element domain sound pressure guiding vector, radial vibration velocity guiding vector and tangential vibration velocity guiding vector are constructed, and then the spatial filtering pretreatment matrix is designed, the output data of vector array is preprocessed;Then use the sound pressure vibration velocity mutual covariance matrix generated by the filtered element domain data of each channel to combine the beam forming of each channel guiding vector, passive detection of target is realized, and the simulation experiment verifies that the achievement can improve the anti-interference ability of vector circular array under cylindrical barrier plate.

The present invention relates to a method for evaluating the vibration of a four-point contact ball bearing under a preload, and belongs to the technical field of bearing vibration detection. Because it is difficult to evaluate the vibration of a four-point contact ball bearing under a preload, the present invention calculates the working contact angle of the bearing under a preload based on the geometric characteristics of the four-point contact ball bearing. The center of curvature of the outer ring groove of the outer ring before vibration is determined based on the working contact angle. The outer ring is displaced when subjected to the preload, and a force analysis is performed based on the position of the center of curvature of the outer ring groove before and after vibration. A vibration equation is established based on the force applied to the outer ring, and the vibration equation is solved to obtain the radial vibration acceleration of the bearing. The vibration of the bearing under a preload is then evaluated based on the radial vibration acceleration.

The invention discloses an evaluation method for vibration impedance performance of a range extender rotor hub, and the method comprises the steps: setting a plurality of response points on the surface of the rotor hub, and enabling the response points to be distributed at two axial sides and to be circumferentially symmetrical; broadband sine excitation is applied to the radial direction of each response point, and excitation force and multidirectional vibration response of each point are recorded; calculating a global vibration impedance response function based on the exciting force and the vibration response data, and drawing a vibration impedance curve; based on the vibration impedance curve, a radial secondary mode, a radial tertiary mode, a shafting primary core mode and a shafting secondary core mode of the vibration impedance curve are identified respectively, and related numerical values are recorded; and then calculating a radial vibration impedance coefficient RK according to the radial modal parameters, calculating a shafting vibration impedance coefficient SK according to the shafting modal parameters, calculating a total vibration impedance coefficient by combining the RK and the SK, and performing grading evaluation.