670 results about "Torsional vibration" patented technology

The present invention relates to a flywheel (1) for a drive train of a motor vehicle, comprising a main flywheel mass (4) forming an input side (2) which can be screwed to a crankshaft of an internal combustion engine through a plurality of screw holes (5) distributed in the circumferential direction (U) of the flywheel (1), a slip clutch (6) arranged downstream of the main flywheel mass (4) in a torque transmission path emanating from the input side (2), and a torsional vibration damper (7) arranged downstream of the slip clutch (6) in the torque transmission path and which has both an output flange (11) and a hub (8) forming an output side (3), which is connected in a rotationally fixed manner to the output flange (11), with through holes (10) distributed in the circumferential direction (U), wherein the torsional vibration damper (7) has a disassembly device (12) which can be removed by rotation and which is designedto remove the non-rotatable connection of the hub (8) to the output flange (11) so that the through holes (10) can be aligned with the screw holes (5).

The invention discloses a digital twin intelligent test run system based on a marine medium-speed diesel engine and a monitoring method, relates to the technical field of monitoring, and is used for solving the problems of degeneration identification lag and low emission early warning precision of an oil injector. The system comprises a multi-source heterogeneous data preprocessing module and a running state intelligent diagnosis module. The multi-dimensional data acquisition module is used for acquiring in-cylinder pressure, crankshaft torsional vibration and transient air-fuel ratio signals to construct multi-dimensional data vectors, and the multi-dimensional data acquisition module is used for analyzing combustion fluctuation characteristics based on an attention mechanism LSTM (Long Short Term Memory) network, identifying early deterioration of an oil injector and outputting an oil injection consistency coefficient and a fault type identifier. The method comprises the steps that according to an oil injection consistency coefficient, electromagnetic valve response delay and combustion parameter correlation are tracked, a degradation trend is predicted, and emission early warning is generated; and according to prediction and early warning results, fuel injection compensation parameters are dynamically adjusted in the digital twinborn model, a recursive least square method is adopted to identify combustion parameters and feed the combustion parameters back to an electric control unit, and self-adaptive optimization and closed-loop control in the test run stage are achieved.

The present invention discloses a method and device for simultaneously measuring the bending vibration and torsional vibration of a rotating machinery shaft. The gear disk is installed on the shaft to be measured, and the gear disk is driven to rotate by the shaft to be measured. An alternating voltage signal is output by the eddy current sensor and converted into a digital signal by the software part, so as to obtain the original vibration signal. The maximum value finding method is used twice to extract the bending vibration and torsional vibration of the shaft. Through the above method, the simultaneous measurement of the torsional vibration and bending vibration of the shaft can be realized. The same set of sensors and instruments are used for the two types of vibration measurements, and the cost is relatively low.

The invention relates to an ultrasonic transducer capable of realizing a high torsional vibration-longitudinal vibration amplitude ratio and a design method thereof. The ultrasonic transducer comprises a piezoelectric ceramic vibrator 3, an amplitude-change pole 2 and a tool head 1 which are connected in sequence, the shape of the amplitude-change pole is formed by rotating a specific geometric curve around the axis. The interior of the amplitude-change pole is of a cavity structure 5, the wall thickness distribution of the amplitude-change pole is adjustable, the cavity structure is a through hole or a blind hole, and the shape of the cavity structure is an equal-diameter cavity extending along the axis or a special-shaped cavity formed by rotating a specific geometric curve around the axis. By optimizing the internal cavity structure and the wall thickness distribution and adjusting the amplitude proportion between torsional vibration and longitudinal vibration, the longitudinal vibration of the transducer can be converted into longitudinal torsional vibration, so that the transducer has both longitudinal vibration and torsional vibration. Due to the unique cavity type structure in the amplitude-change pole, the amplitude ratio of generated torsional vibration to longitudinal vibration can be larger, the ultrasonic effect with the high torsional vibration-longitudinal vibration amplitude ratio can be generated, and vibration output with the high torsional vibration-longitudinal vibration amplitude ratio can be achieved.

The invention relates to the technical field of lubricating oil monitoring, in particular to a compressor lubricating oil online monitoring vibration diagnosis method and system, and the method comprises the steps: obtaining vibration signal data of a compressor bearing, a connecting rod mechanism and a piston assembly and lubricating oil medium parameters, arranging the data according to a time sequence, and generating a lubrication working condition time sequence signal data set; according to the method, through time sequence matching of vibration signal data and lubricating oil state parameters, a lubricating working condition time sequence signal data set is established, and in combination with time window division, the bearing vibration frequency offset, the piston transverse impact amplitude and the connecting rod torsional vibration change rate are extracted; and calculating the viscosity drop rate, the temperature change range and the pollutant particle growth rate of the lubricating oil, screening the correlation trend of the bearing vibration frequency offset before and after the change of the lubricating state, and enhancing the lubricating state recognition capability.

The invention discloses a method and device for restraining shaft system torsional vibration of a net-forming type double-fed fan under the variable wind speed. The method comprises the steps that a mathematical model of the electromagnetic torque-rotating speed difference of the net-forming type double-fed fan is constructed; drawing an electromagnetic torque-rotating speed difference Bode diagram according to the mathematical model; according to the mechanical parameters of the wind turbine and the motor, the shafting natural oscillation frequency of the doubly-fed fan is calculated, and stability analysis is conducted on damping of the shafting natural oscillation frequency in combination with the Bode diagram; drawing a small-signal model block diagram according to the mathematical model; analyzing the small-signal model block diagram to obtain an analysis result that a current loop provides a coupling path for the rotating speed and the active power; according to a stability analysis result and an analysis result of the small-signal model block diagram, negative damping brought by an operation area is weakened by reducing current loop bandwidth, so that the risk of torsional vibration of the shaft system is reduced.

The invention discloses a welding tool and method for a lubricating oil pipe of a torsional vibration damper of a low-speed diesel engine, the tool comprises bottom base I-shaped steel, side base I-shaped steel, a side base transverse plate and a bottom base transverse plate, the bottom base I-shaped steel is placed on the ground, the side base I-shaped steel and the bottom base transverse plate are welded on the bottom base I-shaped steel, and the included angle between the side base I-shaped steel and the bottom base transverse plate is 90 degrees; a positioning hole is formed in the upper surface and is used for positioning a lubricating oil pipe flange; the welding method comprises the steps that a flange is pre-connected, a lubricating oil pipe is hoisted to a tool transverse plate datum plane, and a positioning pin locking hole position is inserted; and the included angle between the axes of the left flange and the right flange of the lubricating oil pipe is calibrated to be 90 + / -0.5 degrees, full welding is completed through the TIG segmented welding technology, the deformation is controlled to be smaller than or equal to 0.15 mm, and finally assembly welding of the torsional vibration damper lubricating oil pipe is completed. The positioning device solves the positioning problem of the lubricating oil pipe before welding, error accumulation is avoided, the working efficiency and precision are improved, the sealing performance of lubricating oil pipe parts is guaranteed, and the positioning device has the advantages of being simple in structure, convenient to install, reliable in positioning, high in precision and high in efficiency.

A generator module for a vehicle includes a housing arranged for fixing to a combustion engine, a stator fixed in the housing, a rotor, rotatable within the stator and arranged for driving connection with the combustion engine, and a damper arranged in a torque path between the combustion engine and the rotor for damping torsional vibrations from the combustion engine.

The invention belongs to the technical field of mechanical transmission systems, and particularly discloses a method and a system for calculating, regulating and controlling the vibration isolation rate of a rigidity-variable magnetic torsional vibration buffer, and the method comprises the following steps: obtaining a real-time working condition, modeling a single permanent magnet magnetic field by adopting an equivalent magnetic charge method, and calculating the vibration isolation rate of the rigidity-variable magnetic torsional vibration buffer; a magnetic block negative stiffness model and a spring torsion sheet positive stiffness model of the annular Halbach array are constructed, the total coupling stiffness is calculated, the vibration isolation effect of the magnetic torsional vibration buffer is solved, vibration suppression effects and resonance interval distribution under different working conditions are obtained, and based on the vibration isolation effect of the magnetic torsional vibration buffer, the vibration suppression effect of the magnetic torsional vibration buffer is calculated. The gap adjustable mechanism adjusts the rigidity of the spring torsion sheet and the gap of the magnetic ring in real time. By the adoption of the technical scheme, the gap between the inner magnetic ring and the outer magnetic ring is flexibly set according to multi-working-condition requirements, so that applicability and reliability are improved, and low-frequency torsional vibration is effectively restrained while efficient torque transmission is ensured.

The invention discloses a method, device and equipment for inhibiting abnormal torsional vibration of a propulsion shafting and a storage medium, and relates to the technical field of ship propulsion systems.The method comprises the steps that the torsional vibration inherent frequency and the torsional vibration modal shape corresponding to the abnormal torsional vibration frequency of the propulsion shafting are matched; calculating the modal mass and the modal damping ratio of the abnormal torsional vibration of the matching order, and calculating the bearing reaction at the rear stern bearing and the front stern bearing; fitting friction coefficients among the rear stern bearing, the front stern bearing and the propulsion shafting; according to the reaction force, the friction coefficient and the matched torsional vibration modal shape, calculating a friction excitation torque under the torsional vibration modal shape of the corresponding order and a Taylor expansion coefficient corresponding to the friction excitation torque; and according to the matched inherent frequency of the torsional vibration, the modal mass, the modal damping ratio and the Taylor expansion coefficient, a suppression device used for generating electrical damping is arranged on the propulsion shafting so as to suppress the abnormal torsional vibration. According to the application, the abnormal torsional vibration can be accurately suppressed by accurately designing the structural parameters of the suppression device.

The invention discloses a wind driven generator large-torque transmission chain resistance increasing control method and system, and relates to the technical field of wind driven generator resistance increasing control. The method comprises the steps that operation parameters of a wind driven generator are collected in real time and preprocessed; calculating a rotation fluctuation frequency set and a corresponding amplitude spectrum of the current time window, and tracking and locking the dominant vibration frequency; constructing a fan state space prediction model containing the torsional vibration state of the transmission chain, outputting the predicted variable quantity of the torque of the transmission chain in the next control period, constructing a filter bank based on the dominant vibration frequency, performing filtering compensation on the predicted variable quantity, and generating an electromagnetic torque given value; and performing phase lead compensation on the electromagnetic torque given value, generating a control instruction, sending the control instruction to the wind power converter, and controlling the wind power generator to output the corresponding electromagnetic torque by using the wind power converter. Through systematic multi-link cooperative processing, the vibration suppression effect and the operation stability of the transmission chain can be comprehensively improved.

The invention discloses an ice region ship shock absorber matching optimization method based on NSGA-III, which comprises the following steps: establishing a motor-silicone oil shock absorber-shafting-propeller coupling system kinetic model, calculating transient torsional vibration response under ice load impact by adopting a Newmark-beta method, and constructing a multi-target optimization model by taking the outer diameter, thickness, side clearance and top clearance of a shock absorber as design variables; an initial population is generated in combination with Latin hypercube sampling, and an optimal parameter combination is obtained after iterative optimization is conducted through an NSGA-III algorithm; experimental data show that the torsional vibration stresses of the motor shaft, the 1 # intermediate shaft, the 2 # intermediate shaft and the propeller shaft of the optimized shock absorber at the rated rotating speed are respectively reduced by 18.0%, 11.1%, 11.8% and 17.7%, and the effectiveness of the method is verified.

According to the pure electric underground dumper power assembly suspension structure, a dumper power assembly comprises a traction motor and a gearbox, the gearbox is connected with a dumper frame through a first suspension mechanism, and the traction motor is connected with the dumper frame through a second suspension mechanism; the first suspension mechanism comprises first frame end mounting seats fixed to the inner sides of frame edge beams on the two sides of the gearbox and a first equipment end mounting seat arranged between the first frame end mounting seats on the two sides. The second suspension mechanism comprises second equipment end mounting seats fixed to the two sides of the traction motor respectively and second frame end mounting seats fixed to the inner sides of the two frame edge beams respectively, the second equipment end mounting seats correspond to the second frame end mounting seats, and second vibration reduction assemblies are arranged between the second equipment end mounting seats and the second frame end mounting seats. The mounting seat is simple and reliable in structure, convenient to mount and high in space utilization rate; each supporting point of the power assembly is provided with an anti-vibration pad, vibration can be effectively isolated, and the torsional vibration influence of the power assembly is reduced.

The invention relates to the technical field of spacer test, and particularly discloses a wire spacer torsional vibration test device, which comprises a mounting seat, a mounting piece, a torsional piece, a pushing part and a driving piece, and is characterized in that the mounting piece comprises a mounting shell, a wire clamp I, a wire clamp II and an elastic part, a circuit comprises a wire group I and a wire group II, and the mounting shell is rotationally connected with the mounting seat; the first wire set and the second wire set are connected to the mounting shell through the first wire clamp and the second wire clamp respectively, the second wire clamp is connected with the mounting shell through the elastic part, the driving part is connected to the mounting part, the pushing part is connected to the driving part, a plurality of protrusions with different tip heights are arranged on the pushing part, and the driving part can drive the pushing part to rotate. The driving part can drive the pushing part to downwards press the second wire set, and the twisting part is connected to the mounting base; the wire spacer torsional vibration test device can simulate the application of the wire spacer in different actual environments.

The invention relates to the technical field of dust removers, and discloses a bag-type dust remover for sintering waste gas treatment and a fracturing propping agent ceramsite sand preparation technology.The bag-type dust remover for sintering waste gas treatment comprises a dust filtering chamber, a dust collecting chamber is arranged below the dust filtering chamber, and the bag-type dust remover further comprises a dust filtering unit; the first supporting plate and the second supporting plate are vertically arranged in parallel, a transverse plate is arranged below the first supporting plate, a plurality of dust filtering assemblies are horizontally arrayed on the first supporting plate and the second supporting plate, each dust filtering assembly comprises a polygon prism-shaped filter cylinder, a cylinder support is arranged in each filter cylinder, and each cylinder support comprises a plurality of parallel supporting ribs; and during dust filtration, the filter cartridge and the cartridge support are in a twisting state. According to the device, by increasing the surface area and the wrinkle density of a filter material, the smoke dust collecting capacity per unit volume is remarkably improved, and the filtering efficiency is improved compared with that of a traditional cylindrical filter cartridge; the pulse airflow excites the reciprocating torsional vibration of the filter cartridge, and the energy storage effect of the inertia disc and the conical spring is combined, so that the smoke dust falling rate is increased.

The invention discloses a propulsion shafting abnormal torsional vibration diagnosis method, device and equipment and a storage medium, and relates to the technical field of ship propulsion systems.The method comprises the steps that torsional vibration inherent frequencies and torsional vibration modal shapes of a propulsion shafting under multiple target orders are obtained; the modal mass and the modal damping ratio of the propulsion shaft system under each target order are calculated, and the bearing reaction at the rear stern bearing and the front stern bearing is calculated; fitting friction coefficients among the rear stern bearing, the front stern bearing and the propulsion shafting; according to the reaction force, the friction coefficient and the torsional vibration modal shape under the target order, calculating a friction excitation torque under the torsional vibration modal shape of the corresponding order and a Taylor expansion coefficient corresponding to the friction excitation torque; and judging according to the inherent frequency of the torsional vibration, the modal quality, the modal damping ratio and the Taylor expansion coefficient under the target order, and checking whether the torsional vibration mode of the target order of the propulsion shafting has abnormal vibration or not. Whether friction torsion abnormal vibration is generated or not can be predicted according to the shafting design parameters.

The invention discloses a multi-branch power system stabilizer suitable for a wind-thermal bundling system, which adopts a cooperative control structure in which a low-frequency branch and a subsynchronous branch are connected in parallel, and suppresses low-frequency oscillation in a frequency band of 0.1-4Hz through a second-order filtering module, a blocking compensation module and a lead-lag module of the low-frequency branch. And the subsynchronous branch extracts a subsynchronous risk mode based on an inverse transformation matrix of a generator shafting torsional vibration mode quantity, and directionally injects a damping signal in combination with a phase compensation module to suppress subsynchronous oscillation in a frequency band of 10-50 Hz. And the parallel output module performs superposition amplitude limiting on the multi-branch signals and then accesses an excitation regulator to dynamically regulate the electromagnetic torque so as to realize wide-frequency-domain oscillation suppression. Through modal quantity directional control, parameter adaptive setting and multi-branch dynamic decoupling, the problems of insufficient multi-band suppression capability, parameter mismatch, controller conflict and the like of a traditional power system stabilizer in a wind-fire coupling system are solved, and the stability and robustness of a new energy high-permeability power grid are remarkably improved.

The invention provides a multi-modal ultrasonic machining closed-loop control system and method based on online detection feedback, and the system is provided with a dual-frequency combined machining module, a multi-modal monitoring array and a calculation controller, and deeply integrates ultrasonic machining, online detection and an intelligent control system. The surface forming quality and the material removal rate of a workpiece are judged according to vibration data, collected in real time, of a machining tool and received ultrasonic reflected waves, and the amplitudes and the vibration phases of a coaxial longitudinal / torsional vibration generator, a first ultrasonic generator and a second ultrasonic generator are regulated and controlled through an ultrasonic integrated circuit according to the judgment result. The dual-frequency composite vibration mode of the coaxial longitudinal / torsional vibration generator is regulated and controlled; real-time quality monitoring and closed-loop self-adaptive regulation and control in the machining process are achieved, the machining precision and the surface forming quality can be remarkably improved, meanwhile, accumulation of size errors is effectively restrained, the part machining precision and efficiency are improved, the service life of a tool is prolonged, and the system stability and the intelligent level are improved.

The invention provides a torsional vibration self-adaptive control method in a motor driving process of a planetary multi-gear hybrid power system, which realizes vehicle torsional vibration suppression and gives consideration to multi-working-condition adaptability, anti-interference capability and algorithm complexity requirements, and comprises the following steps of: constructing a torque reconstruction and feedback control algorithm; the initial torque demand of the motor is corrected into a gently changing torque, the torque is split into sub-torques with a specific phase difference, the sub-torques are superposed to obtain a reconstructed torque, the reconstructed torque is combined with a feedback torque, and a self-adaptive adjustment torque is output; setting a multi-working-condition torque demand, performing off-line optimization on control parameters, obtaining a constructed working condition control parameter library, performing identification and weighted calculation on a seating point of an initial motor torque demand, and outputting an optimized control parameter to a torque reconstruction and feedback control algorithm; and performing algorithm interference adaptive compensation, obtaining an interference estimated value according to the rotating speed of the output shaft and the nominal inverse model, calculating an interference compensation value through a filter, adding the interference compensation value with the adaptive adjustment torque to obtain a total target torque of the motor, and outputting the total target torque to a controlled vehicle.

The invention belongs to the technical field of vibration control, and discloses a tuned mass damping device for controlling low-frequency vertical bending vortex vibration of a large-span bridge, which consists of a fixed pulley, a mass block, a high-strength light force transmission cable, a spring, a hanging ring and a damper. Fixed pulleys and mass blocks are arranged at the positive and negative maximum displacement positions of a longitudinal bridge direction mode of a main beam respectively, a suspension system is formed by a full-length force transmission cable, and the gravity of the two mass blocks is basically balanced; the mass block is connected through the spring and is close to the bridge vibration control target frequency. When the bridge vibrates, the two mass blocks generate inertia forces which are opposite in direction but overlapped with each other, the driving system and the bridge form resonance, and therefore bridge vibration is effectively restrained. The gravity of the mass block can be self-balanced, the strength and the number of the springs are greatly reduced compared with those of a traditional TMD, any low-frequency tuning can be conducted in a vertical limited space, and the engineering cost is remarkably reduced. The device can be used for controlling vertical bending and torsional vibration of various engineering structures; the damper is replaced by an actuator, so that active control can be realized or the damper can be used as a structural excitation device.

The invention relates to an ultrasonic-assisted longitudinal-torsional compound vibration two-roller rolling device, and belongs to the technical field of ultra-thin strip rolling. According to the device, the ultrasonic longitudinal-torsional vibration device is combined with the rolling mill, so that the deformation resistance of materials is effectively reduced, the surface roughness is improved, grains are refined, and the residual stress is reduced by utilizing ultrasonic vibration. The device comprises a rolling mill rack, an ultrasonic longitudinal-torsional vibration device, a winding device, a winding assisting device and an unwinding device. The ultrasonic longitudinal-torsional vibration device is composed of a variable-amplitude roller shaft, a connecting shaft, piezoelectric ceramics, a copper electrode, a rear cover plate and a hexagon socket screw, and has a single-excitation form and a double-excitation form. The single excitation device adopts a quarter-wavelength conical amplitude-change pole, a spiral groove is formed in the conical surface of the quarter-wavelength conical amplitude-change pole, and longitudinal vibration can be partially converted into torsional vibration; according to the double-excitation device, the torsional vibration amplitude is increased through cooperation of two longitudinal-torsional amplitude-change poles which are symmetrically arranged. The device is compact in structure, small in energy loss, high in machining precision and suitable for production of high-precision ultra-thin strips.

The invention relates to a vibration control design method for a ship low-speed motor direct propulsion long shafting, and the method comprises the steps: determining the position of a low-speed motor output flange and the central position of a propeller, determining the positions of a thrust bearing, an intermediate bearing, a tail pipe bearing and the like, arranging the span of the bearings, arranging the number of the bearings, and calculating the shafting strength. Torsional vibration calculation of the long shaft system of the low-speed motor, torsional vibration calculation result analysis, centering calculation of the long shaft system of the low-speed motor, cyclotron vibration calculation of the long shaft system of the low-speed motor, longitudinal vibration calculation of the long shaft system of the low-speed motor, fatigue analysis of a thrust bearing, verification of whether the thrust bearing meets the load requirement or not, shaft system jacking verification, and the like. And finally verifying the shafting vibration control design effect through a navigation test. Different from conventional diesel engine propulsion and high-speed motor propulsion shafting design, the method starts from the characteristics of a low-speed motor direct propulsion shafting, and analysis is carried out through shafting strength design, torsional vibration, centering, rotation, longitudinal vibration, installation and other systems, so that the risks of shafting load imbalance and abnormal vibration are avoided.

The invention belongs to the technical field of bridge wind resistance, and discloses a large-span bridge wind-induced low-frequency torsional vibration control device which is mainly composed of a fixed pulley, a rope, a mass block, a spring and a damper or an actuator. Based on the characteristic that the two sides vertically vibrate in opposite phases during torsional vibration of a bridge girder, mass blocks are transversely and symmetrically arranged on the bridge girder in a stress mode of rope suspension and fixed pulley transmission, so that the mass blocks on the two sides are balanced in self weight in a static state, and the bearing capacity requirement of a spring or an actuator and the engineering cost are greatly reduced. Compared with a low-frequency torsional vibration control traditional passive measure, the strength, the length, the number and the cost of the spring are greatly reduced, and the static deformation of the spring is greatly reduced. Compared with a low-frequency torsional vibration control traditional active measure, the driving force and power consumption requirements of the actuator are greatly reduced, the weight is lighter, and the cost is lower. The device is also suitable for different-frequency torsional vibration control and torsional vibration excitation of other engineering structures, the function is powerful, and the application range is wide.

The invention discloses a service life prediction method of an automobile shock absorber, and relates to the technical field of service life evaluation. The method comprises the steps that the engine speed, the torsional amplitude value, the engine oil temperature and the load torque are collected, and an engine parameter set is formed after preprocessing; standard parameters of engines of the same model are collected, a frequency spectrum peak value is obtained by processing torsional amplitude values in a parameter set, and the resonance frequency of the engines is calculated by combining the standard parameters; constructing a damper operation state threshold model based on an STL time sequence decomposition method, inputting engine oil temperature and load torque to obtain a threshold, comparing resonant frequency with the threshold, and determining a damper damping state; the torsional vibration change rate is calculated and compared with standard parameters of the same model to obtain the working state of the shock absorber; and constructing a shock absorber life prediction model based on an accumulative damage theory, inputting a damping state, a working state and an engine parameter set, and outputting residual life. According to the method, the multi-dimensional real-time working condition parameters are considered, so that the residual life of the automobile shock absorber is predicted more accurately.

The present invention discloses a power optimization method and system for suppressing the load on a wind turbine transmission system. The method comprises: S1, obtaining the operating parameters of each wind turbine and establishing a wind turbine state-space equation; S2, using a power demand command as a boundary condition, upper and lower limits of the wind turbine active power output, and the angular velocity and torsional torque of the transmission system as constraints, and minimizing the variation of the transmission system angular acceleration and torsional torque as the objective function, to solve the active power reference value for each wind turbine based on the wind turbine state-space equation; S3, measuring the fatigue level of the transmission system based on historical operating data of each wind turbine, calculating a corresponding weight based on the fatigue level, and then correcting the active power reference value based on the weight to obtain the final active power command. The present invention can effectively suppress torsional vibration, improve fatigue damage to the transmission system, and enhance the safety and stability of wind turbine grid-connected operation.

The invention discloses an active control method and system for suppressing torsional vibration of a permanent magnet synchronous wind driven generator, and the method comprises the steps: building a dual mass-rigidity-damping model through a lumped mass method based on transmission chain parameters and pneumatic torque, and obtaining a transmission chain dynamic equation; performing torsional vibration characteristic analysis on the natural wind speed, the pneumatic torque and the transmission chain dynamic equation to obtain a torsion angle, an eigenfrequency, a damping ratio equation and electromagnetic torque influence evaluation; and controller design is carried out on the torsional vibration mathematical model and the active disturbance rejection controller parameters to obtain an electromagnetic torque compensation amount, and active suppression of torsional vibration is realized. According to the invention, through cooperation of a physical model and intelligent control, a sensing-analysis-compensation closed loop is formed; a high-precision mathematical model is constructed, and a wind-machine-electricity coupling effect is captured; the ADRC regards unknown parameters and external disturbance as total disturbance, real-time estimation and compensation are carried out through a tracking differentiator, and an accurate system model is not needed; torsional vibration is restrained, and adaptability is enhanced.

The invention discloses a power optimization method and system for inhibiting the load of a transmission system of a wind turbine generator, and the method comprises the steps: S1, obtaining the operation parameters of each wind turbine generator, and building a state-space equation of the wind turbine generator; s2, taking an electric power demand instruction as a boundary condition, taking upper and lower limits of active power output of a wind turbine generator and angular velocity and torsional torque of a transmission system as constraint conditions, and taking minimization of variable quantities of angular acceleration and torsional torque of the transmission system as a target function; solving an active power reference value of each wind turbine generator based on the wind turbine generator state-space equation; and S3, measuring the fatigue degree of the transmission system according to the historical operation data of each wind turbine generator set, calculating the corresponding weight according to the fatigue degree, and correcting the active power reference value according to the weight as a final active power instruction. Torsional vibration can be effectively restrained, fatigue damage of a transmission system is improved, and the safety and stability of grid-connected operation of the wind turbine generator are improved.

The invention relates to a range extender torsional vibration suppression method and system based on high-order filter active damping, and the method comprises the following steps: comparing the target rotating speed of a motor with the actual rotating speed, and obtaining a motor rotating speed error; the motor rotating speed error is converted into rotating speed output torque through a rotating speed controller; extracting a motor rotating speed fluctuation component through a high-order composite filter according to the actual rotating speed of the motor; obtaining compensation torque according to the motor rotating speed fluctuation component in combination with the proportional gain coefficient; superposing the compensation torque into the rotating speed output torque, and performing negative feedback control on the rotating speed of the motor to obtain a final motor torque instruction; and the rotating speed of the motor is controlled according to the final motor torque instruction, and torsional vibration of the range extender is restrained. Compared with the prior art, the torsional vibration of the range extender can be effectively inhibited, the rotating speed fluctuation is reduced, and the NVH performance and the operation stability of the range extender are improved.

The invention discloses a double-spindle machining control method and system, and relates to the technical field of device machining, and the method comprises the steps: collecting an instantaneous angular position deviation data stream between double spindles according to a preset sampling frequency, the double spindles including a target spindle and a reference spindle; generating a compensation data set according to the instantaneous angular position deviation data stream, the compensation data set being used for mapping the rotation angle of the reference main axis into a compensation value for compensating the angular position deviation; calculating a target predicted rotation angle of the reference main shaft; calculating a target compensation value according to the target predicted rotation angle and the compensation data set; according to the target compensation value, a feedforward control instruction is generated, and the feedforward control instruction is used for restraining torsional vibration of the reference spindle. According to the invention, double-spindle machining control is realized, and the control precision and the product quality are improved.

The invention relates to an active and passive torsion damper test platform and a test method. The test platform comprises a test bench, and the test bench is provided with an adjustable-speed motor, a first rotating speed and torque sensor, a first acceleration sensor, a speed reducer, a brake mechanism, an eddy current loader, a tested active and passive torsion damper and an industrial personal computer. The speed regulation motor provides power for the test platform, the speed reducer adjusts the rotating speed and torque output by the speed regulation motor, the tested active and passive torsion damper jointly provides a damping effect, the brake mechanism comprises a brake shaft, a brake disc and a brake and provides a brake state for the test platform, and the eddy current loader applies torque to the brake shaft to simulate road resistance torque. The industrial personal computer monitors information collected by the sensors in real time and controls the controllers. According to the testing method, the testing platform can be used for testing the vibration damping performance of the active and passive torsion vibration damper. According to the invention, the test requirements of users can be met, and the performance of active and passive torsion dampers can be tested simultaneously under different working conditions.