721 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 provides a marine diesel engine shafting longitudinal-torsional coupling vibration calculation method. The method specifically comprises the following steps: S1, calculating crankshaft longitudinal-torsional coupling rigidity; s2, calculating torsional vibration excitation at the propeller by using a CFD method; s3, establishing a ship propulsion shafting coupling free vibration kinetic equation through the calculated longitudinal-torsional coupling stiffness; s4, calculating a longitudinal-torsional coupling inherent frequency and a vibration mode of the ship propulsion shafting through a coupling free vibration kinetic equation of the ship propulsion shafting; and S5, substituting the propeller excitation calculated in the step S2 into the ship propulsion shafting coupling forced vibration kinetic equation to calculate the longitudinal-torsional coupling forced vibration response of the ship propulsion shafting. According to the marine diesel engine shafting longitudinal-torsional coupling vibration calculation method, the crankshaft longitudinal-torsional coupling rigidity is calculated based on a material mechanical deformation energy method, and related exciting force considering the crankshaft longitudinal-torsional coupling effect is obtained by combining related formulas of marine diesel engine shafting dynamics; and finally, ship shafting longitudinal-torsional coupling vibration inherent characteristics and ship shafting longitudinal-torsional coupling forced vibration response are obtained through calculation.

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.

The invention belongs to the technical field of fan torsional vibration prediction, and particularly relates to a torsional vibration prediction method, device and equipment for a net-forming type direct-driven fan and a storage medium, and the method comprises the steps: constructing a small signal model of the net-forming type direct-driven fan; based on a shafting dual-mass-block model, deducing the relation between the direct-drive fan port voltage and current signals and the direct-drive fan shafting torsional vibration when forced oscillation occurs; when forced oscillation occurs, a transfer function between different power grid node ports is obtained by constructing a wind power plant s domain node admittance model, so that required voltage and current signals of the power grid node ports are calculated, and the calculated voltage and current signals are used as input of a small signal model of a grid-constructing type direct-driven fan. And calculating the torsional vibration of the shaft system of the mesh-forming type direct-drive fan caused by forced oscillation by combining the relationship between the voltage and current signals of the port of the mesh-forming type direct-drive fan and the torsional vibration of the shaft system of the mesh-forming type direct-drive fan. The potential torsional vibration problem can be found and processed in time, and faults are avoided.

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 provides a drill string vibration reduction method and device.The method comprises the steps that longitudinal vibration data and torsional vibration data of a target drill string when a vibration reduction tool is tripped into multiple positions are obtained, and the longitudinal vibration data comprise hook load, a mass matrix, a stiffness matrix, a structural damping matrix, a drilling fluid damping effect matrix, a speed vector and an acceleration vector; the torsional vibration data comprises a rotational acceleration vector, a rotational speed vector, a rotational inertia matrix, a torsional rigidity matrix, a torsional structure damping matrix and a torsional drilling fluid damping matrix; the vibration intensity of the whole well section is determined by applying the longitudinal vibration model, the torsional vibration model, the longitudinal vibration data and the torsional vibration data; and according to the vibration intensity of the whole well section, the optimal tripping-in position of the vibration reduction tool is selected from all the positions, the vibration reduction tool is tripped into the optimal tripping-in position, and the vibration reduction process of the target drill column is completed. The reliability of the tripping-in position of the vibration reduction tool can be improved, and then the vibration reduction effect of the drill column can be improved.

The invention discloses a service life prediction method and device for a vehicle and an engine silicone oil damper and a medium, and the service life prediction method for the engine silicone oil damper comprises the steps: obtaining the service life of an external characteristic rated point of the damper in a rack endurance test environment; wherein the service life of the external characteristic rated point is the service life of the shock absorber when the engine is at the highest rotating speed and the highest load rate; acquiring a road actual measurement load spectrum of the shock absorber; determining the actual damage value of the shock absorber according to the actually measured load spectrum of the road and the service life of the external characteristic rated point; the actual damage value is the damage value of the shock absorber during the road spectrum acquisition period; and predicting the service life of the shock absorber under the road working condition according to the actual damage value and the driving mileage during the road spectrum acquisition period. According to the technical scheme, accurate prediction of the service life mileage of the shock absorber under the road working condition can be realized based on the torsional vibration test working condition and the actually measured road spectrum, so that reliability evaluation of the shock absorber after the torsional vibration test is guided.

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 relates to a multi-point support bending-torsion coupling excitation dynamic characteristic estimation method for a planetary speed change mechanism, and belongs to the technical field of planetary gears. The problem that the dynamic load of the multi-point supporting bearing under the actual working condition is difficult to predict and inhibit due to the dynamic coupling effect between the bending-torsional vibration of the transmission shaft and the dynamic load of the multi-point supporting bearing and the dynamic load of the planetary gear set in the prior art is solved. The method comprises the following steps: acquiring various planet wheel component parameters and various bearing parameters of the planetary speed change mechanism; based on each bearing parameter, calculating to obtain the time-varying nonlinear support stiffness of the bearing; establishing a subsystem dynamical model of the planetary speed change mechanism based on the time-varying nonlinear support stiffness of the bearing and the component parameters of each planetary gear; in a given time step, when an inner ring and an outer ring of an intermediate bearing rotate at the same time, the dynamic load fo and the deformation delta o of a planet carrier / bearing seat to the outer ring of the bearing and the dynamic load fi and the deformation delta i of a transmission shaft to the inner ring are calculated, the supporting rigidity and the dynamic response of a system at the current moment are calculated, and dynamic models of subsystems of the planetary speed change mechanism are combined; and a fourth-order Runge-Kutta numerical iteration algorithm is used to solve the dynamic characteristic estimation result, the dynamic response of the planetary speed change mechanism in the next time step is obtained, and loop iteration is carried out until the dynamic characteristic estimation is completed.

The invention discloses a bridge nonlinear flutter modal characteristic analysis method, device and equipment and a medium, and relates to the technical field of numerical simulation, fluid mechanics software is utilized, and a Navier-Stokes equation is subjected to transient solution based on a grid file and a development program to obtain lift force, torque and resistance of a current time step length; judging whether the current time step length is smaller than a preset time step length threshold value or not, and if not, judging whether all working conditions corresponding to different parameters in the development program are completely calculated or not; if all the calculation is completed, obtaining all lift forces, torques and resistances; carrying out amplitude change flutter derivative identification and calculation on all lift forces, torques and resistances to obtain amplitude change flutter derivatives related to vertical bending vibration, torsional vibration and lateral bending vibration, and carrying out bridge nonlinear flutter modal feature analysis on a bridge section by utilizing the amplitude change flutter derivatives to obtain a nonlinear flutter modal feature analysis result; the amplitude change flutter derivative related to lateral vibration can be recognized, and the accuracy and universality of amplitude change flutter derivative recognition are improved.

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.