183 results about "Rotor vibration" patented technology

According to the bearing rigidity optimization and vibration reduction design method for the rotor and the bearing system, under the condition that the structural form of the rotor and the bearing system is not subversively adjusted, the elastic bearing and the extrusion oil film damper are arranged and designed, and the bearing rigidity of the rotor and the bearing system is optimized. The fulcrum rigidity is reduced to change the strain energy distribution of the rotor and adjust the critical rotating speed, and the vibration level of the rotor, especially vibration caused by sudden unbalance and transcritical of the multi-fulcrum rotor, is suppressed.

The invention provides a rotating machine fault diagnosis method and a related system. The rotating machine fault diagnosis method comprises the following steps: S1, constructing a rotor vibration equation according to a vibration behavior of a rotor system under an operation condition; s2, acquiring real-time information of a to-be-diagnosed rotating machine, performing modal analysis based on a rotor vibration equation according to the real-time information of the to-be-diagnosed rotating machine to determine a sensitive frequency band and key features, and forming multi-dimensional feature data; s3, carrying out denoising processing on the multi-dimensional feature data and carrying out signal reconstruction to obtain a reconstructed signal; s4, inputting the reconstruction signal into a pre-trained rotating machine fault model to obtain a fault diagnosis result; and the rotating machine fault model is fused by adopting a neural network ordinary differential equation and a convolutional neural network-gating cycle unit. The method can accurately simulate and predict the continuous dynamic change of the system, improves the diagnosis precision, and enhances the real-time performance and robustness of the model.

The invention relates to the technical field of aero-engine rotor vibration tests, in particular to an aero-engine rotor unsteady-state thermally induced vibration test system which comprises a rotor experiment table, an air inlet and exhaust system, a lubricating oil system, a protection system and a heating system. The rotor experiment table comprises a first supporting system, a second supporting system, a rotor outer protection casing, a gas compressor disc, a gas compressor sealing disc, a turbine disc, a turbine front sealing disc, a front shaft diameter, an inter-disc drum, a rear shaft diameter, a first squirrel-cage elastic support, a ball bearing, a second squirrel-cage elastic support and a rolling rod bearing. The first supporting system is composed of a first squirrel-cage type elastic support and a ball bearing, meanwhile, an air inlet is formed in the first supporting system, and the ball bearing in the first supporting system is connected with the front shaft diameter in an interference fit mode. Rotor unsteady-state characteristics considering heating conditions are finally created, and vibration response and durability of a wheel disc structure under the unsteady-state thermal load condition are studied in combination with test conditions such as temperature vibration and the like.

The invention discloses a fast and accurate identification method for counter-rotating double-rotor unbalanced coupling vibration of a paddle fan engine. An unbalanced coupling signal separation method based on double-rotor micro-speed-difference waveform envelope is combined with an automatic balancing technology. Based on the characteristic of vibration coupling of inner and outer rotors of a micro-speed-difference double-rotor system, a vibration signal shows a beat vibration phenomenon. By extracting beat peak and beat valley characteristics of beat vibration signals, unbalanced vibration amplitudes and phase information of the inner rotor and the outer rotor are separated. And optimizing the separated vibration signals by adopting an unbalanced coupling signal separation method based on birotor parameter modeling and data fitting to obtain high-precision amplitude and phase parameters, and taking the high-precision amplitude and phase parameters as input parameters of an automatic balance control system. And combining a trial mass method and an influence coefficient method to calculate the unbalance magnitude and position of the inner and outer rotors. And finally, the automatic balance controller drives a counterweight disc in the actuator to move to a target position, the unbalance amount of the rotor system is counteracted, and dynamic balance of the system is achieved.

The invention discloses a new method for active control of global vibration of a helicopter body, and provides a method for active control of global vibration of a helicopter body by installing a piezoelectric laminated actuator on a main reducing support rod to control the vibration load of a rotor wing in order to solve the problems that the global vibration control effect of the helicopter body is poor and the transmission of the vibration load of the rotor wing to a helicopter body structure cannot be inhibited by a traditional structural vibration active control method. The invention relates to a novel active control method for global vibration of a helicopter body with a stay bar vibration load as a control target. The purpose of reducing the global vibration level of the helicopter body is achieved. The method can suppress the rotor vibration load transmitted to the helicopter body structure, has the advantage of efficiently suppressing the global vibration level of the helicopter body, and has the control convergence speed superior to that of a traditional method.

The present application belongs to the technical field of helicopters, and particularly relates to a split type intelligent variable-pitch pull rod for adjusting rotor vibration, comprising a pitch controller, a controller connecting piece, and a plurality of pitch variable-pitch pull rods; the number of the pitch variable-pitch pull rods is the same as the number of the blades; the lower end surface of the controller connecting piece is installed on a rotor hub, and the upper end surface of the controller connecting piece is installed with the pitch controller; each pitch variable-pitch pull rod is installed between an automatic tilting device dynamic ring yoke and a blade variable-pitch rocker arm; the pitch controller is connected with the plurality of pitch variable-pitch pull rods through a cable; one end of the cable is connected with the pitch controller through a plug, and the other end is connected with the pitch variable-pitch pull rod; and the middle cable is installed and fixed on the rotor hub and a blade root support arm, thereby solving the problems of complex structure, large size, poor maintainability, and low structural reliability of the existing intelligent variable-pitch pull rod.

The invention discloses a vertical double-disc rotor vibration experiment table with multiple adjustable vibration factors. Comprising an L-shaped base, a variable frequency motor, a motor support, a coupler, a rotating shaft, a bearing seat, a transverse moving device, a disc, a feather key, a sensor support, a magnetic powder brake, a magnetic powder brake support, a magnetic powder tension controller, a computer, an information collector, a signal conditioner, a frequency converter, an inductive sensor, a T-shaped sliding block and a mass block. The unbalanced mass is regulated and controlled by increasing or decreasing the number of the mass blocks on the discs, the load of the magnetic powder brake can be controlled by adjusting the magnetic powder tension controller, and the axial position of the double discs can be changed. Under the excitation of the vibration, the displacement of the disc in the X and Y directions is recorded by using an inductive sensor so as to analyze the vibration characteristics of the disc. The method is suitable for simulating rotor experiments under various vibration excitation, and aims to verify the accuracy of theoretical analysis or provide reference for reducing the vibration of actual mechanical equipment.

The invention belongs to the technical field of RSW pumps of CANDU6 nuclear power stations, aims to solve the problem that modal aliasing and false components exist in EMD decomposition in traditional HHT, and discloses a time-frequency analysis method and system for non-stationary vibration signals of an RSW pump of a CANDU6 nuclear power station, and the method comprises the steps: obtaining a rotor vibration signal, carrying out VMD decomposition on the rotor vibration signal, obtaining K modal components, and carrying out VMD decomposition on the K modal components; performing HT transformation on the K modal components, obtaining a Hilbert spectrum of an original signal, finally obtaining the original signal, and performing diagnosis on a rotor fault according to the change of a characteristic frequency in the Hilbert spectrum; the system comprises a vibration signal acquisition module, a signal decomposition and center frequency evaluation module, a modal component and center frequency solving module, a constraint problem conversion module, a modal component calculation module, a Hilbert spectrum acquisition module, an analysis signal construction module and an original signal restoration module. According to the method, the VMD method with excellent decomposition performance is combined with the HT, and the fault feature recognition capability of a traditional HHT method in processing rotor non-stationary vibration signals is optimized.

The invention discloses a rotary machine dynamic balance optimization method based on an attitude performance correlation model, and relates to the technical field of rotary machine dynamic balance optimization. Comprising the following steps: S1, synchronously collecting rotor vibration signals and temperature field data through temperature and vibration sensors, carrying out real-time calibration on structure parameters, substituting a temperature compensation algorithm to calculate interference components, and outputting pure vibration deviation data subjected to temperature compensation; the structural parameters comprise a rotor thermal expansion coefficient, a bearing radial clearance temperature attenuation coefficient and inherent or dynamic characteristic parameters related to material properties, geometric dimensions and connection states of the rotary machinery. The method has the advantages that through deep combination of vibration and temperature, a temperature-frequency spectrum-amplitude three-dimensional coupling traceability matrix is constructed; multi-feature matching is achieved through a fusion algorithm, temperature-dominated vibration sources and mechanical-dominated vibration sources can be clearly distinguished, and the accuracy of the dynamic balance optimization direction is guaranteed.

The invention relates to the technical field of fault prediction, and discloses an excitation online monitoring system, which comprises an information acquisition module, a data processing module, a mechanical wear quantification module, a shaft vibration health analysis module, a feature fusion module, a mechanical health analysis module and an early warning instruction generation module, collecting multi-source operation data in the gas generator set in real time; performing time-frequency domain conjoint analysis on the excitation current waveform to obtain a current high-frequency ripple component; carrying out harmonic distortion rate fusion on the current high-frequency ripple component to obtain a current ripple characteristic coefficient; dynamically correcting a preset rotor vibration threshold value, and comparing the rotor shaft vibration signal with the dynamically corrected rotor vibration threshold value to obtain a shaft vibration health index; performing cross-domain feature fusion to obtain fused features; carrying out the normalization processing of the fusion features, obtaining a comprehensive health state score, and generating a PHM early warning instruction of a fault block in the excitation primitive; according to the invention, the excitation monitoring accuracy of the gas generator set can be improved.

The invention discloses an engine pull rod type rotor rigid sleeve tooth coupling connection rigidity robustness design method and application thereof. The method is used for dynamic optimization design of a three-fulcrum supporting slender center pull rod rotor structure in an aero-engine or a gas turbine. According to the method, the rotor kinetic analysis finite element model is established, the critical rotating speed and strain energy density distribution of the rotor are calculated and analyzed, and the position and the structure of the coupler are optimally designed by combining static and dynamic strength requirements. The method comprises the steps of optimizing fulcrum rigidity and rotor structure parameters, analyzing the positioning reliability of a coupling positioning spigot, moving a coupling to a low strain energy density and low stress area, performing iterative verification and optimization and the like. By optimizing the position and the structure of the coupler, the connecting rigidity robustness of the coupler is improved, the dynamic performance of the rotor is optimized, the vibration risk of the rotor is reduced, and the method can be directly applied to engineering design of aero-engines and gas turbines and has important engineering application value.

The invention discloses a generator stator winding dynamic turn-to-turn short circuit fault detection method and device, and relates to the technical field of generator state monitoring and fault diagnosis, and the method comprises the steps: measuring a generator rotor vibration signal in real time; transforming the vibration signal from a time domain signal to a frequency domain signal by using fast Fourier transform; and comparing the collected time domain signal and the converted frequency domain signal with each component of the frequency spectrum of the vibration signal under the normal condition, and judging whether the generator has a winding dynamic turn-to-turn short circuit fault or not. Whether the dynamic turn-to-turn short circuit fault of the stator winding occurs in the generator is identified by detecting the rotor vibration of the generator. The method is simple and easy to implement, overcomes the defects of winding dynamic turn-to-turn short circuit fault detection at present, is obvious in detection characteristic and good in effect, and provides reference for detection and diagnosis of generator stator winding dynamic turn-to-turn short circuit faults.

The invention provides a rotor wing shielding compensation method for helicopter satellite communication, and relates to the technical field of helicopter communication methods, and the method comprises the following steps: collecting angular velocity data in real time through a rotor wing main shaft sensor, constructing a rotating speed state equation, and providing accurate input for phase prediction; predicting a rotor phase based on an extended Kalman filter; a dynamic time slot distribution function is designed, so that the communication time slot length is automatically adjusted along with the rotation speed change of the rotor; a non-linear phase error caused by rotor vibration is counteracted through a feed-forward compensation item; closed-loop time calibration of a communication protocol and a mechanical system is realized by adopting double PID controllers. According to the method, real-time closed-loop synchronization of a mechanical system and a communication protocol is realized by establishing a three-dimensional mapping relation of rotor rotating speed-phase-communication time slot, so that the problem of nonlinear error accumulation during dynamic change of the rotating speed is solved.

The invention discloses a rotor vibration adjustment prediction method and system based on deep learning, and belongs to the technical field of rotor vibration control. The method comprises the following steps: receiving a vibration amplitude, a phase, a blade number and geometric parameters; analyzing the phase into sine and cosine components, interacting with a vibration value, converting geometric parameters into physical characteristics such as a span-chord ratio and rotational inertia, and constructing a 31-dimensional characteristic vector; a multi-layer perceptron model is trained for 2-8 blades, the input of the multi-layer perceptron model is the 31-dimensional feature vector, and the output of the multi-layer perceptron model is the balance weight adjustment amount of each non-reference blade; and performing feature processing on real-time data, inputting the processed data into a corresponding model, obtaining a prediction scheme, and estimating the vibration reduction amount. According to the method, high-precision, rapid and self-adaptive rotor vibration prediction and adjustment are realized by fusing a physical mechanism and deep learning, and the maintenance efficiency and the flight safety are remarkably improved.

The invention discloses a rotor dynamic balance method giving consideration to vibration threshold control and counterweight vibration elimination efficiency, and the method comprises the steps: obtaining an original vibration signal and a key phase signal of a rotor through data collection equipment, and obtaining a vibration signal and a key phase signal after a trial weight is added; the amplitude and phase of an original unbalance signal of the rotor and the amplitude and phase of an unbalance signal after the trial weight is added are obtained after analysis and calculation, an optimization function with the maximum comprehensive vibration of balance weight reduction under the balance rotating speed as the target is constructed, and rotor dynamic balance optimization calculation is carried out based on a raccoon optimization algorithm. The balance weight giving consideration to the rotor vibration threshold constraint and the balance weight efficiency is obtained, and the maximum vibration is reduced through the minimum balance weight under the condition that the vibration control target is met; according to the method, the problem that in the traditional dynamic balance mass calculation process, a single-target optimization algorithm represented by minimum residual vibration, maximum vibration minimization and the like is difficult to consider the residual vibration amplitude and the counterweight balance efficiency at the same time is solved.

It is described a method of damping a vibration (15) of one or more rotor blades (5) of a wind turbine (1), the rotor blades being coupled to a rotor (3a) of a wind turbine generator (3), during an operation mode different from a power production mode, the vibration in particular including an edgewise vibration (14) out of a rotor plane (15), the method comprising: monitoring a characteristic (17), in particular including magnitude and / or phase and / or frequency, of the vibration (14); determining a torque reference (21, Tref) based on the characteristic of the vibration which is suitable for damping the vibration; generating a torque by the generator (3) according to the torque reference (21, Tref).

The invention relates to the technical field of aero-engines, in particular to a rotor supporting structure which comprises a supporting cylinder, a worm gear, a worm and a pressing block. A plurality of strip-shaped holes are formed in the side face of the supporting cylinder, and the strip-shaped holes are distributed in the circumferential side direction of the supporting cylinder. The worm gear rotationally sleeves the supporting cylinder; the worm is meshed with the worm gear; the pressing blocks are fixedly arranged on the inner wall of the worm gear, the pressing blocks correspond to the strip-shaped holes one to one, and the pressing blocks are partially located in the corresponding strip-shaped holes; when the worm gear rotates in the circumferential direction, the pressing blocks can be driven to extrude the side walls of the corresponding strip-shaped holes so as to change the rigidity of the rotor supporting structure. According to the variable-stiffness rotor supporting structure capable of performing active control, when a modern aero-engine operates under variable working conditions, the supporting stiffness can be actively controlled under different working conditions, the effects of being away from the critical rotating speed and reducing the resonance peak value are achieved, rotor vibration response suppression is achieved, and therefore the effect of reducing vibration of the aero-engine is achieved.

The invention provides a power transmission rotor vibration test bench capable of simulating multi-vibration-source excitation. Comprising a T-groove workbench, a variable frequency motor, a transverse sliding table with a groove, a motor support, a coupler, a first rotating shaft, a first bearing seat, a mass disc, a shaft sleeve, a radial loading device, a large gear, a small gear, a second bearing seat, a second rotating shaft, a magnetic powder brake, a magnetic powder brake support, a first support, a second support, a tension controller, a frequency converter and a signal modulator. A data collector; and a computer. The device can be used for testing the dynamic characteristics of the rotor under various vibration excitation working conditions. The transverse positions of the variable frequency motor and the first bearing seat can be adjusted through the transverse sliding table with the groove, and the working conditions of shaft misalignment and gear transmission center distance change are simulated; a radial loading device is adopted to adjust the applied radial load; an eccentric mass can be added into the mass disc to simulate an unbalanced mass; different load working conditions are simulated by changing the braking force of the magnetic powder brake.

A compound helicopter includes a fuselage including a fuselage airframe, a translational thrust system coupled to the fuselage airframe and a pylon assembly subject to vibration. The pylon assembly includes a transmission and a rotor system having a main rotor assembly. The compound helicopter also includes a main rotor vibration isolation system including a plurality of augmented liquid inertia vibration eliminator units each having an isolation frequency and each coupled between the fuselage airframe and the pylon assembly to reduce transmission of the pylon assembly vibration to the fuselage airframe at the isolation frequency. Each augmented liquid inertia vibration eliminator unit includes at least one active tuning element movable to tune the isolation frequency thereof.

The present disclosure provides a method for evaluating the influence degree of water turbine generator rotor vibration on stator low-frequency vibration, relating to the technical field of water turbine generators. The method includes: decomposing the first vibration waveform of the water turbine stator and the second vibration waveform of the rotor to obtain the fundamental wave and the harmonic wave respectively; sorting the fundamental wave and the harmonic wave of the stator based on the waveform vibration amplitude to obtain a first sorting result; sorting the fundamental wave and the harmonic wave of the rotor based on the waveform vibration amplitude to obtain a second sorting result; when the stator fundamental wave and the harmonic wave are in the same phase relationship, the rotor fundamental wave and the harmonic wave are in the same phase relationship, and the first sorting result is consistent with the second sorting result, it is determined that the cause of the stator low-frequency vibration is the rotor vibration. The present disclosure can quickly and effectively evaluate whether the stator low-frequency vibration is from the rotor, realize the rapid troubleshooting of the fault cause, help to reduce the fault search range, shorten the fault finding and processing time, and reduce the downtime of the water turbine generator set.

The present invention discloses a vibration and current feature fusion monitoring device for the wear state of a screw pump rotor, which belongs to the technical field of screw pump monitoring. The device comprises: obtaining the real-time vibration and current signals of the screw pump rotor, constructing a variational mode decomposition objective function with energy constraints, initially dividing the vibration signal into intrinsic mode functions, screening the correlation coefficients, obtaining the vibration subsets of the rotor and hull structure, and then separating the rotor vibration signal by an independent component analysis algorithm. A hierarchical feature fusion strategy is used to synchronize the pre-processed signals, construct a multivariate time series matrix, extract the wear feature set and perform phase space reconstruction to accurately identify sudden wear points. Once identified, the probability of sudden wear is calculated, the wear rate is corrected in combination with the normal wear degree, the remaining life is predicted and the maintenance level is divided. The device aims to solve the problems of existing screw pump monitoring technology being susceptible to interference, delayed response, difficult to adapt to complex working conditions and insufficient model generalization, and to ensure the stable operation of the ship's power system.

The invention relates to the technical field of flywheel energy storage, in particular to a flywheel energy storage equipment predictive dynamic balancing device and system based on photon perception. The sensing module is embedded into the end face of the rotor body; the control module is connected with the sensing module to receive transmission; the execution module is arranged along the circumference of the rotor body and is connected with the control module so as to be driven by the control module; the safety mechanism is located in an annular cavity formed in the rotor body and connected with the rotor body so as to be driven by centrifugal force. The beneficial effects of the invention are that the photonic crystal fiber network unit collects rotor vibration, displacement, stress, temperature and other data in real time and predicts the unbalance trend, the control module generates an adjustment strategy, the execution module is driven to carry out counterweight compensation and unbalance correction, and the system is kept stable.

The invention relates to the technical field of motor control, and discloses a rotor vibration suppression method based on outer air gap radial force of a stator partition magnetic regulation motor, which comprises the following steps of: 1, obtaining an inner and outer layer air gap accurate magnetic conductance model according to a conformal transformation method; 2, constructing two new rotor structures for inhibiting the radial force of the outer air gap of the motor; step 3, analyzing the reason for suppressing the low-order radial force amplitude of the outer air gap of the stator partitioned magnetic field modulation motor by the new rotor structure; and 4, establishing a multi-physical field structure model, and simulating the vibration performance of the stator partitioned magnetic field modulation motor with different rotor structures. According to the method, a magnetic conductance-magnetomotive force model is established to analyze the flux density-radial force harmonic waves of the stator partitioned magnetic field modulation motor, it is clear that dominant radial force harmonic waves for generating main electromagnetic vibration are distributed according to outer air gap radial force distribution characteristics of the stator partitioned magnetic field modulation motor, and a rotor of a surface and internal auxiliary groove structure is provided; and the radial force amplitude existing in the outer air gap is effectively inhibited.

The invention discloses a steam extraction and condensation type steam turbine stable in operation, and belongs to the field of steam turbines.The steam extraction and condensation type steam turbine stable in operation comprises a base, a bearing shell is fixedly connected to one side of the top of the base, a steam input pipe is fixedly connected to the top of the bearing shell, a bearing seat is fixedly connected to one side of the bearing shell, and a rotating shaft is rotationally connected to the interior of the bearing seat; a stabilizing assembly used for reducing vibration of the steam turbine is fixedly connected between the top of the base and the bearing shell and comprises a plurality of fixing columns fixedly connected into the stabilizing assembly at equal intervals. A pure mechanical stable assembly composed of a fixing column, a sliding balance weight sleeve, a damping ring and a spring is arranged and is in linkage with a rotating shaft or a bearing shell through a connecting arm, a reciprocating plate and the like, harmful vibration needing to be dissipated in a traditional design is converted into reciprocating mechanical energy capable of being utilized, an external power source or complex control is not needed, and the energy consumption is reduced. Therefore, the real-time and self-adaptive suppression of the vibration of the rotor can be realized.

The invention provides a brushless motor efficiency operation monitoring method, which comprises the steps of capturing each phase current signal in real time from an operation environment of a brushless motor, extracting a current amplitude and a phase angle of the current signal, identifying normal distribution and abnormal deviation of each phase current amplitude, and obtaining a preliminary three-phase current amplitude difference degree; the determined radial force eccentricity and the determined eccentric angle are obtained and compared with the rotor vibration displacement collected at the same time, the periodic distribution of the vibration displacement is recognized, and therefore the quantitative correspondence of the vibration amplitude and the force eccentricity is obtained; the offset space of the phase difference is correspondingly evaluated according to the quantification of the vibration amplitude and the force eccentricity, and the phase compensation angle is dynamically adjusted by adopting a PID control algorithm to optimize the electromagnetic tension distribution, so that the magnitude and the direction angle of the adjusted radial resultant force are obtained.

This invention relates to a vibration suppression method based on high-precision closed-loop synchronous rotating coordinate transformation. First, a dynamic model of the deflection of a magnetically levitated rotor affected by mass imbalance is established. Then, a synchronous vibration controller based on a high-precision closed-loop synchronous rotating coordinate transformation method is used to track the synchronous frequency disturbance component, and a high-precision closed-loop synchronous frequency signal detection method is employed to improve the detection accuracy of the synchronous frequency vibration signal. Finally, the synchronous frequency vibration signal is eliminated by inverting and compensating the original system, thereby eliminating the synchronous frequency disturbance current and the synchronous frequency vibration torque. This method overcomes the problem of low detection accuracy of synchronous frequency signals in traditional synchronous rotating coordinate transformation methods, effectively improving the suppression effect of synchronous frequency disturbance current, and providing a new control method for unbalanced rotor vibration control. This invention belongs to the field of magnetically levitated rotor control and can be used for unbalanced vibration control of two-degree-of-freedom deflection of magnetically levitated rotors.

The present invention relates to a method, device, and system for suppressing rotor vibration in a magnetic bearing system, belonging to the field of magnetic bearing control technology. The method comprises: predicting a second displacement signal of the rotor at the current moment based on the current signal of the magnetic bearing winding at the current moment and the first displacement signal of the rotor at the previous moment; determining a current compensation signal based on the rotor's rotational frequency and the second displacement signal determined by the current signal of the winding at the current moment; and superimposing the current compensation signal and the original current command to obtain a target current command. The method provided by the present invention can extract the rotational frequency and rotor position without installing a position sensor inside the motor, greatly optimizing the motor's structural design and avoiding operational instability and maintenance costs caused by sensor damage. It can effectively implement a vibration suppression algorithm in magnetic bearing systems where sensors are not installed or cannot be installed, effectively suppressing rotor vibration.

The invention provides a magnetic suspension generator rotor vibration suppression device and method, and belongs to the technical field of magnetic suspension generators, and the device comprises an electromagnetic bearing, a passive magnetic bearing and a damper; the electromagnetic bearing comprises an iron core and two coil assemblies, the iron core is installed on the outer wall of the rotor, and the two coil assemblies are arranged around the iron core; the passive magnetic bearing comprises an inner-ring permanent magnet and an outer-ring permanent magnet, the inner-ring permanent magnet is mounted on the outer wall of the rotor, the outer-ring permanent magnet is mounted on the inner wall of the generator shell, and the two corresponding permanent magnets have the same magnetism; the damper is installed on the generator and provided with a damping body and a stress sensor, one end of the rotor is connected to the damping body, and one end of the damping body is connected to the stress sensor. According to the magnetic suspension generator rotor vibration suppression device provided by the invention, by virtue of the radial and axial targeted suppression design, the out-of-control galloping of the rotor caused by excessive vibration is effectively avoided, and the operation stability and safety of the generator are guaranteed.

The invention relates to an analysis method for analyzing the vibration behavior of an electric motor comprising a stator and a rotor inserted into the stator, wherein the analysis method includes the following steps: a. Setting the rotor into vibration by a1. mechanical, or a2. is electromagnetically excited, or a3. the rotor is set into rotation by operating the motor. In one step b. The vibration behavior of the rotor is recorded via at least one motor winding intended for the operation of the motor. A corresponding analysis device is also described.

The invention discloses a variable-stiffness magnetorheological fluid elastic vibration isolator for a variable-speed rotorcraft, which comprises a closed cavity formed by a magnetic flux outer cylinder, a magnetic flux inner cylinder and an annular magnetorheological elastomer connected between the magnetic flux outer cylinder and the magnetic flux inner cylinder, inertia liquid is filled in the cavity, and a magnet exciting coil is arranged in an outer ring groove of the magnetic flux inner cylinder. The magnetic flux outer cylinder, the magneto-rheological elastomer and the magnetic flux inner cylinder form a closed magnetic circuit, and the magnetic field intensity is changed by adjusting the current of the magnet exciting coil, so that the shear modulus of the magneto-rheological elastomer is continuously and reversibly adjusted and controlled, and online adjustment of the rigidity of the vibration isolator is achieved. The inner cylinder connected with the magnetic flux inner cylinder is provided with an inertia channel, when external vibration is introduced, liquid flows in the channel, and inertia force opposite to exciting force is generated at an anti-resonance frequency point to achieve efficient vibration isolation. The variable vibration frequency of the rotor wing is dynamically matched through the electronic control rigidity, the problems that a traditional vibration isolator is narrow in frequency band, and a mechanical frequency conversion scheme is slow in response and complex in structure are solved, and the vibration isolator has the advantages of being fast in response and compact in structure.