75 results about "Torsional vibration" patented technology

The present application relates to the technical field of regenerative braking, in particular to a mine truck energy recovery torque rate control method based on vehicle mass and transmission parameters, comprising the following steps: collecting vehicle operation data to construct a time series data set, calculating kinetic energy response sensitivity index and correcting the maximum allowed rising slope, extracting elastic power difference value and oscillation component based on second-order differentiation, and generating torque rate control instruction. In the present application, the influence degree of the current load state of the vehicle on the kinetic energy recovery is quantified, and the maximum allowed rising slope is dynamically corrected accordingly to accurately adapt to different load conditions. The elastic power difference value of the transmission system is extracted by using the second-order differentiation of power, and the oscillation component is separated. When the oscillation is detected to exceed the threshold, the dynamic damping correction value is calculated to down-regulate the limit parameter, which not only ensures the smoothness of torque establishment under heavy load conditions to avoid mechanical damage, but also effectively suppresses the elastic torsional vibration of the transmission system.

This invention provides a dual-end driven long shaft system multi-order torsional vibration test platform and a torsional vibration identification and suppression method, relating to the field of long shaft system variable frequency drive technology. The platform includes two dual-winding drive motors respectively located at both ends of the shaft system, a load motor located in the middle, and a switchable shaft system connection structure, along with a dual-master, dual-slave cooperative control system composed of four drive frequency converters. This method achieves controllable excitation of multi-order torsional vibration by superimposing the load torque step and the frequency excitation source. It utilizes differential amplification and dual-channel filtering in the signal processing module to extract speed fluctuation characteristics, accurately identifying the critical speeds of each order in the system. For the identified torsional vibration phenomenon, a speed differential negative feedback algorithm is used to correct the torque command of the frequency converter, and the torsional vibration energy of the elastic transmission chain is offset by actively enhancing the system's electrical damping. This invention solves the problem of reproducing complex torsional vibration under safe and controllable conditions and verifying suppression strategies in ultra-large generator units.

This invention discloses a method for configuring phase-shifting parameters of a STATCOM controller to suppress subsynchronous resonance, comprising: determining the target generator set to be suppressed by the STATCOM controller, its target torsional vibration mode, and typical operating modes; for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method, calculating the effective range of phase-shifting angles in which the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation; performing an intersection operation on the effective ranges of phase-shifting angles of all typical operating modes to obtain a common safe configuration range; selecting phase-shifting angle values ​​from the safe configuration range and configuring them into the damping control channel of the corresponding key shaft torsional vibration mode in the STATCOM controller.

A method for controlling a drive motor (2) of a motor vehicle, wherein the motor vehicle has a drive train (1) comprising the drive motor (2), at least one wheel (6) which is driven by the drive motor (2), and at least one mechanical component for transmitting the torque provided by the drive motor (2) to the at least one wheel (6), wherein the torque provided by the drive motor (2) is controlled in order to minimize torsional vibrations in the drive train (1), wherein the torque provided by the drive motor (2) is controlled using a state-space model, which represents the drive train (1) of the motor vehicle, and state variables of a controller determined therefrom, wherein the controller is designed by pole placement in the state space.

A propeller excitation measurement system and method taking into account the influence of shafting bending and torsional vibration belong to the field of ship propulsion devices. It includes a propeller, a sealing device, a propeller bearing, a bearing dynamic excitation force sensor, a torque speed instrument rotor, a torque speed instrument stator, a front / rear stern bearing, a diaphragm coupling, a thrust bearing, a counterweight balance disc, a front / rear intermediate bearing, a motor coupling, a driving motor, a frequency conversion controller, a data analysis and acquisition instrument, a test bench base, a rotating shaft, an eddy current displacement sensor, an optical electric speed sensor and a propeller mounting shaft sleeve. It aims to overcome the technical bottleneck of the existing propeller excitation direct measurement method, that is, the difficulty in arranging underwater sensors, high cost and influence on shafting transmission performance. At the same time, it solves the problem that the existing indirect measurement method cannot eliminate mechanical structure excitation interference and the measurement precision is insufficient, so as to realize a propeller hydrodynamic excitation measurement method which can take into account the influence of shafting bending and torsional vibration, has low cost and high precision.

The application discloses a synchronous measurement and analysis method and system for torsional vibration of a steam turbine shaft system and blade vibration, and belongs to the technical field of monitoring of steam turbine generator units. The method comprises noise suppression processing on multi-mode synchronous signals and correlation analysis, so as to obtain coupling modal characteristics representing the comprehensive state of the steam turbine shaft system-blade, and to evaluate and analyze the coupling modal characteristics based on a pre-constructed coupling analysis model. In the application, an adaptive filter is used to filter the blade vibration signal, and cross modulation spectrum of the torsional vibration demodulation timing information and the vibration modal characteristic component is determined based on a mutual information function, so as to accurately determine the cross phase relationship at the sampling point, obtain the coupling modal characteristics representing the comprehensive state of the steam turbine shaft system-blade, and more comprehensively and accurately reflect the overall operation state of the steam turbine.

The invention relates to a drive unit (1) for a hybrid powertrain, comprising an internal combustion engine (2), an electric motor (4) and a decoupling clutch (6) radially arranged within a rotor (5) of the electric motor (4) between a crankshaft (3) of the internal combustion engine (2) and the rotor (5), wherein a torsional vibration isolation device (8) is connected downstream of the rotor (5), wherein the torsional vibration isolation device (8) is connected in a rotationally fixed manner to the rotor (5) by means of a plug connection (22), and the plug connection (22) is formed by an inner profiled portion associated with the rotor (5) and an outer profiled portion complementarily configured on the torsional vibration isolation device (8). In order to avoid noise and excessive wear at the plug connection (22), a pretensioning device (30) of the plug connection (22) comprises at least one pretensioning element (31) fastened to the rotor (5), which adjusts the pretensioning in the circumferential direction relative to a support surface (34) of the torsional vibration isolation device (8).

This invention provides a constant torsion damper, belonging to the field of drilling technology. It includes an outer cylinder with an inner cavity, comprising an upper connector, an upper sleeve, a splined sleeve, an intermediate cylinder, a connecting body, a lower sleeve, a lower connecting body, and a lower connector connected in sequence; an inner mandrel with a central flow channel, installed within the outer cylinder, comprising an upper mandrel, an intermediate mandrel, a mandrel connecting body, a lower mandrel, and an extension mandrel connected in sequence; and a damping assembly, including a line contact rolling assembly mounted on the upper mandrel, a small disc spring mounted on the intermediate mandrel, and a large disc spring mounted on the lower mandrel. This invention can suppress harmful torsional vibrations during drilling operations, thereby protecting the drill string, increasing drilling speed, and reducing costs.

The application discloses a torsional negative stiffness vibration isolation device based on pre-tensioned springs and belongs to the technical field of vibration isolation devices.The vibration isolation device can normally transmit the rated torsional motion of a system, reduces the torsional dynamic stiffness of the system, lowers the natural frequency, realizes the torsional vibration isolation of shaft system components under low-frequency and ultralow-frequency bands, and has a good vibration isolation effect.Two ends of two connecting rod devices are connected in a hinged manner on an inner part and corresponding sliding blocks respectively, the two sliding blocks are limited in displacement directions through sliding grooves fixed on the inner side of an outer part, and elastic elements generate acting forces on the two sliding blocks and apply torsional moments on the inner part through the two connecting rod devices.The application introduces a negative stiffness device, reduces the torsional dynamic stiffness of a shaft system structure, lowers the natural frequency of the system in the torsional direction, and realizes the vibration isolation function under low-frequency and ultralow-frequency bands.

The invention relates to a torsional vibration damper (1) with a rotational axis (2) for a drive machine (3), comprising a motor shaft connection (4) for a motor shaft (5) and a hub (6) for a transmission input shaft (7), wherein in the torque curve between the hub (6) and the Motor shaft connection (4) are arranged as follows: - a torque limiter (8); and - a torsional damper unit (9) with a hub-side flange (10) and a motor-side flange (11), and an energy storage device (12) between the flanges (10, 11), wherein the hub-side flange (10) is directly connected to the hub (6) in a torque-resistant manner, wherein the torque-resistant connection between the hub-side flange (10) and the hub (6) is formed in an axially detachable, form-fit manner. The torsional vibration damper (1) is characterized in particular by the fact that an axial locking element (19) is axially secured on the rear side of the hub-side flange (10), and the axial locking element (19) has an axial holder (20) which projects axially forward relative to the hub (6), and the hub (6) is axially secured relative to the hub-side flange (10) by means of the axial holder (20) of the axial locking element (19). A torsional vibration damper is proposed here, which is easy to install and remove.

The utility model discloses a kind of flexible photovoltaic support arrays, including at least two rows of flexible photovoltaic support being arranged along first direction, each row of flexible photovoltaic support includes: at least two columns, at least two columns include being arranged at the two ends of each row of flexible photovoltaic support along second direction, first direction is perpendicular to second direction;Beam, is arranged at the upper end of each column;Cable structure, connect two beams, for setting photovoltaic module;Support frame, is arranged in cable structure;Flexible photovoltaic support array further includes wind-resistant component, wind-resistant component is arranged between two adjacent rows of flexible photovoltaic support, wind-resistant component includes pulley, cable and counterweight, two pulleys are respectively arranged in two support frames along first direction, cable is wound around two pulleys, two counterweights are respectively arranged at the two ends of cable.The flexible photovoltaic support array is strong in wind resistance, and high in overall stability, and can resist the torsional vibration of row interval photovoltaic module under wind load action.

The present application relates to the technical field of engine testing, and discloses a crankshaft torsional vibration testing system, which comprises a cover-like piece, a damping wheel-like piece, a first gear ring, and a first sensor, wherein the cover-like piece is detachably installed on a crankcase and has an accommodating cavity formed inside; the damping wheel-like piece comprises a profiled spoke, a damping ring, and a profiled mass ring; the profiled spoke rotates synchronously with the crankshaft; the first gear ring is arranged outside the cover-like piece; a flange assembly connects the profiled spoke and the first gear ring, so that the first gear ring rotates synchronously with the profiled spoke; and the first sensor is fixedly arranged on the outer circumferential side of the first gear ring in the radial direction. The profiled cover and the profiled damping wheel are arranged to construct a testing environment consistent with the original engine, and the flange assembly is additionally arranged on the profiled spoke to transmit the crankshaft rotation signal to the first gear ring outside without lag, so that the rotation speed detection is realized in cooperation with the first sensor arranged outside the cover, the precision of the collected rotation speed signal is improved, and the real torsional vibration characteristics of the crankshaft are reflected.

The invention relates to a torsional vibration damper (10) for reducing torsional vibrations in a drive train of a vehicle, comprising an inner component (14) rotatable about a rotational axis (12) by changing a rotational position, several circumferentially spaced spoke springs (18), an outer component (20) rotatably connected to the inner component (14) via the spoke springs (18) and rotatable to a limited extent against a spring force of the spoke springs (18) relative to the inner component (14), wherein the torsional vibration damper (10) has a sensor structure (46) on an outer circumference (44) for a rotation sensor for detecting the rotational position.

The invention relates to a torsional vibration damper (10) for reducing torsional vibrations in a drive train of a vehicle, comprising an inner component (14) rotatable about an axis of rotation (12), several circumferentially spaced spoke springs (16), an outer component (18) rotatably connected to the inner component (14) via the spoke springs (16) and rotatable to a limited extent relative to the inner component (14) against a spring force of the spoke springs (16), and at least one friction element (42) arranged frictionally between the inner component (14) and the outer component (18), wherein at least one of the spoke springs (16) is coupled to the friction element (42) by forming a free angle (50) which allows rotation between the spoke spring (16) and the at least one friction element (42).

A torsional vibration damper device (7) with a flange (8) rotatably mounted about a central axis and at least one damper mass (9) displaceable relative to the flange (8) under centrifugal force, characterized in that the damper mass (9) is displaceably mounted between two side elements (11a, 11b) opposite each other in the axial direction (A) of the torsional vibration damper device (7), and the side elements (11a, 11b) are rotationally fixed to the flange (8), wherein the damper mass is formed from several parts arranged adjacent to each other or spaced apart in the axial direction and not separately connected to each other, and each part of the damper mass (9) is pivotably mounted between the two side elements (11a, 11b) by means of several rollers (14) extending in the axial direction (A), wherein the rollers (14) extend in their central region through holes (2) in each part of the damper mass (9),wherein the axial ends (15a, 15b) of the rollers (14) are slidably mounted in corresponding recesses or openings (17a, 17b) of the side elements (11a, 11b), wherein the recesses or openings (17a, 17b) are essentially kidney-shaped, oval, or oblong.

The application relates to the technical field of space robots, in particular to a circular shaft type arm rod torsional vibration suppression method applying a control moment gyro, which comprises a circular shaft type arm rod torsional vibration suppression mechanism and a dynamic model thereof, expected output torque of the control moment gyro obtained through feedback linearization and angular velocity of a frame angle of the control moment gyro tracked through a PID control law; the circular shaft type arm rod torsional vibration suppression mechanism comprises the control moment gyro and the circular shaft type arm rod.

This utility model relates to the field of torsional vibration measurement technology and discloses a torsional vibration measuring device for large rotating machinery. It includes a main unit and a measuring unit. The main unit includes a handheld rod and a mounting base fixedly connected to one end of the handheld rod. A cable is provided on one side of the handheld rod, and one end of the cable is connected to a measuring instrument. The measuring unit includes a bonding component and a connecting seat fixedly mounted on the bonding component. One end of the connecting seat is connected to one end of the cable. A positioning component is connected to the bonding component and slides within the mounting base. The bonding component includes a moving rod and a strain gauge connected to one end of the moving rod. A pressing head is fixedly connected to the other end of the moving rod, and a return spring is provided inside the pressing head. This invention solves the problems of existing measuring devices being prone to detachment due to various factors during installation, resulting in poor installation stability and insufficient reliability of wireless signal transmission.

This application relates to a graded response control method for full-power variable-speed pumped storage. The method includes: first, acquiring the real-time DC voltage; if the real-time DC voltage does not deviate from the rated value, the capacitor provides priority support; otherwise, the DC voltage deviation is calculated. Then, if the DC voltage deviation falls within the soft-constraint transition stage range, the capacitor provides primary support, with the rotor gradually providing active power support. Finally, if the DC voltage deviation exceeds the upper limit of the soft-constraint transition stage range or the DC voltage change rate exceeds the limit, the rotor rapidly outputs power to restore the DC voltage. Through graded triggering and hysteresis design with clearly defined thresholds, the response is only activated when the DC voltage exceeds the limit. q The shaft current adjusts the electromagnetic torque, thereby mobilizing the rotor's kinetic energy. Minor daily disturbances do not trigger machine-side actions. This significantly reduces the frequency of electromagnetic torque fine-tuning under high-frequency minor disturbances, lowers the superposition effect of shaft torsional vibration and hydraulic pulsation, and helps reduce damage to mechanical structures such as the rotor and speed governor.

This invention discloses a torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, comprising a base, a stator fixed to the base, a gear body connected to the shaft body, and a mover fixed to the gear shaft body. The mover is located in the middle of the stator, and a magnetorheological fluid is injected into and sealed in the cavity between the stator and the mover. Two sets of torsional excitation coils wound along the circumferential direction of the shaft are symmetrically arranged in the stator about the mover. The tangential torque of the magnetorheological fluid is changed by adjusting the excitation current. A torsional vibration isolation ring is provided in the inner diameter direction of the torsional excitation coil windings. Multiple pairs of poles are provided in the stator, and a uniform air gap is provided between the poles and the mover. A transverse vibration excitation coil is wound on each pole, and each set of transverse vibration excitation coils forms an electromagnet. The transverse constraint of the electromagnet on the mover is changed by adjusting the excitation current. A transverse vibration isolation ring is provided between the mover and the stator wall. This invention can reduce vibration and noise.

This invention relates to a vibration testing device and method for a centrifugal pendulum vibration damper. The device includes: a servo motor, whose output shaft is connected to the input end of the vibration damper under test via an input flange, for simulating the power input and order torsional vibration excitation of an engine crankshaft; a hysteresis brake, whose input shaft is connected to the output end of the vibration damper under test via an output flange, capable of applying dynamic alternating load torque for braking output torque; a transparent observation window sealed by an acrylic plate on the primary flywheel of the centrifugal pendulum vibration damper; highly reflective reflective markers set on the flat, non-contact surfaces of the pendulum blocks and rollers; a laser Doppler vibration meter fixed to the outside of the primary flywheel of the centrifugal pendulum, with its optical path aligned with the reflective markers within the window; and a power control unit connected to the laser Doppler vibration meter and input / output torque and speed sensors for signal processing. This invention achieves non-contact measurement of the centrifugal pendulum's operating state, facilitating vibration damper performance verification and fault diagnosis.

The present application relates to a kind of equivalent shaft of crankshaft and its method for calculating the parameters of equivalent shaft of crankshaft, comprising the following steps: S1, parameter input: input the physical parameters of original engine crankshaft system, while the first four order modal frequency of original system and the torsional vibration response of target position are as the calculation benchmark;S2, model establishment: according to the number of original crank crank, determine the total shaft section number and inertia disc number of equivalent shaft;Based on the physical parameters input in S1, construct equivalent shaft parameterized dynamics model, solve the torsional vibration characteristics of shaft system based on motion differential equation;S3, parameter optimization: the geometric size of each shaft section of equivalent shaft and the moment of inertia of inertia disc are as design variable, the first four order modal frequency and torsional vibration response are obtained by parameterized dynamics model calculation, determine optimization target, and iteration optimization is carried out by enumeration method;S4, check and output: whether the modal frequency and torsional vibration response error of equivalent shaft model after iteration optimization is all in the preset allowable error range.

The utility model relates to power system and power electronics technical field, especially a kind of static synchronous compensator control system of inhibiting subsynchronous oscillation, including torsional vibration damping controller, the input of torsional vibration damping controller is electrically connected with generator shafting speed sensor;Static synchronous compensator controller, voltage outer ring reference voltage input terminal and reactive current reference current input terminal are equipped on the circuit board of static synchronous compensator controller;Converter;It is connected in generator stator side;Wherein, the output of torsional vibration damping controller is connected to the soldering pad node of voltage outer ring reference voltage input terminal;Or connected to the soldering pad node of reactive current reference current input terminal;The utility model is accurate by injecting subsynchronous damping control signal into voltage outer ring reference terminal or reactive current reference terminal, solves the key problem that bus voltage fluctuation 10% caused by damping signal straight-through current inner ring in stator side SSR inhibition.

The present application provides a drill string vibration damping method and apparatus. The method comprises: acquiring longitudinal vibration data and torsional vibration data of a target drill string when a vibration damping tool is run into a plurality of positions, wherein the longitudinal vibration data comprises: a hook load, a mass matrix, a stiffness matrix, a structural damping matrix, a drilling fluid damping effect matrix, a velocity vector and an acceleration vector, and the torsional vibration data comprises: a rotational acceleration vector, a rotational speed vector, a moment of inertia matrix, a torsional stiffness matrix, a torsional structural damping matrix and a torsional drilling fluid damping matrix; using a longitudinal vibration model, a torsional vibration model, the longitudinal vibration data, and the torsional vibration data to determine full-wellbore vibration intensities; and on the basis of the full-wellbore vibration intensities, selecting an optimal run-in position of the vibration damping tool from among the positions, and running the vibration damping tool into the optimal run-in position, so as to complete the vibration damping process of the target drill string.

This invention discloses an isolation pulley assembly, comprising a pulley body and a hub. A radial sliding bearing is pressed inside the pulley body. Between the hub and the pulley body, along the radial direction of the hub, a limiting flange A, a bushing, a soft rubber ring, a limiting flange B, and a hard rubber ring are sequentially arranged. Through rubber vulcanization, the soft rubber ring, bushing, and limiting flange B form a primary shock absorber, while the hard rubber ring, limiting flange B, and pulley body form a secondary shock absorber, constituting a two-stage rubber vibration-damping isolation pulley. The isolation pulley of this invention has the following advantages: it can isolate crankshaft speed fluctuations from engine front-end accessories, thereby effectively reducing torsional vibration of the engine front-end accessories and reducing belt wear, noise, and slippage.

The invention relates to a torsional vibration damper (10) for reducing torsional vibrations in a vehicle drivetrain, comprising an inner component (14) rotatable about an axis of rotation (12) for connection with a rotatable connecting component of the drivetrain which exhibits torsional vibrations, several circumferentially spaced spoke springs (16), an outer component (30) rotatably connected to the inner component (14) via the spoke springs (16) and rotatable relative to the inner component (14) to a limited extent against a spring force of the spoke springs (16), a friction device (36) with at least one friction area (48, 54) effective during relative rotational movement between the inner component (14) and the outer component (30) and formed between a friction element (38) and a counter-friction element (42), wherein the friction element (38) is designed as a component separate from the spoke springs (16) and fluid supply means (80) to supply the friction area (48,54) with a cooling fluid.

This invention discloses a structural center of rigidity identification device and method for laboratory use. The device includes a reaction frame, first and second direction displacement sensors, and a vibration table. The vibration table is arranged within the accommodating space enclosed by the reaction frame. The model to be tested is fixedly connected to the vibration table, and a counterweight is placed on the model to be tested. The acquisition device is connected to the first and second direction displacement sensors. The displacement information of the model to be tested along the first direction is measured based on the first direction displacement sensors that abut against the four corners of the model to be tested. The displacement information of the model to be tested along the second direction is measured based on the second direction displacement sensors that abut against the four corners of the model to be tested. This invention utilizes the vibration table to excite torsional vibration of the model to be tested, and further determines the position of the center of rigidity of the model to be tested using a structural center of rigidity identification method for laboratory use.

The application discloses an optimization method and system suitable for non-uniform timing data in torsional vibration measurement, and relates to the technical field of rotating machinery state monitoring.The application comprises the following steps: receiving original square wave signals output by a rotary encoder, detecting pulse edge types, extracting accurate time stamps of each edge, and generating an original time stamp sequence; based on the original time stamp sequence, a time interval sequence is calculated, and a reference time interval is calculated based on an arithmetic average value; double-criterion abnormality identification is performed on the time interval sequence, and an abnormality type is determined; corresponding interpolation correction is performed according to the abnormality type identification result, and an optimized time stamp sequence is generated; and the optimized time stamp sequence is subjected to uniformity verification and output as input data for torsional vibration analysis.The application reconstructs a high-precision torsional vibration waveform through feature identification and deterministic interpolation compensation of the time stamp sequence, and provides reliable data basis for rotating machinery load health monitoring and fault diagnosis.

The application discloses a turbine shaft torsional vibration in-situ detection method under an aero-engine whole machine state, relates to the field of aerospace engines, and comprises the following steps: converting the rotating speed fluctuation generated when the turbine shaft of the aero-engine occurs torsional vibration into the change on the triggered pulse time sequence when the rotor blade reaches the optical sensor, and collecting the blade pulse flow signal through the optical sensor; wherein the optical sensor is fixedly connected with the bore probe structure assembly of the aero-engine; the blade pulse flow signal is high-frequency sampled by using high sampling rate dynamic data sampling, and the rotating speed time domain signal is obtained; the rotating speed time domain signal is subjected to preliminary analysis of turbine shaft torsional vibration, and the torsional angle result of the turbine shaft is determined; and the torsional angle result of the turbine shaft is converted into the torsional vibration result of the turbine shaft based on the strain relationship function between the shaft torsional angle and the torsional vibration. The application can realize efficient and accurate detection of the turbine shaft torsional vibration under the aero-engine whole machine state.

The utility model discloses a kind of torsional vibration damping disc for rotor system, it is related to rotor torsional vibration damping technical field, including disc, swing assembly, bearing, hinge hole bolt, protective shell, screw, nut, wherein swing assembly includes swing block and elastic limit block.Hinge hole bolt is sequentially passed through disc, protective shell, bearing, is connected with disc by nut, protective shell is connected with disc by screw, and elastic limit block is vulcanized with swing block and connects.Damping disc can swing around bearing by swing assembly left and right, so that centrifugal force is offset to generate, to generate the moment of force opposite torsional vibration direction, this will make torsional vibration be inhibited.Elastic limit block of rubber material can limit swing angle of swing assembly and absorb impact.The utility model structure is simple, easy to disassemble and assemble, maintenance cost is low, can be inhibited to the torsional vibration generated when rotor system works, prolong the service life of rotor system.