101results about How to "Improved vibration suppression effect" patented technology

An electric power steering apparatus that is capable of efficiently suppressing vibrations and simultaneously minimizing steering performance degradation such as an increase in a steering wheel's viscous feeling by extracting a vibration component having an arbitrary amplitude and an arbitrary frequency range depending on an electric power steering state parameter and feeding back a vibration suppression compensation value determined depending on the extracted vibration component to a current command value. The apparatus includes a current command value determining section that determines a current command value based on a steering torque and a velocity; a vibration extraction filter that extracts a vibration component having a predetermined amplitude and a predetermined frequency range depending on an electric power steering state parameter; and a compensation value determining section that determines a vibration suppression compensation value based on the vibration component extracted by the vibration extraction filter.

The invention discloses an elevator control device. The elevator control device comprises a speed command generating part, a speed command following part, a load torque calculating part, and a current command following part; the device generates and tracks a speed command of lift car running and a current command of an electric motor, so that the elevator system is ran. The elevator control device further comprises a residual frictional force estimating part, which is used for estimating the static frictional force suffered by the elevation system after stopping; a maximum frictional force estimating part, which is used for estimating the maximum static frictional force suffered by the elevator system; an offset torque calculating part, which is used for calculating the offset torque according to the estimated residual frictional force and the maximum frictional force, wherein initial value of the offset torque is calculated according to the estimated residual frictional force, and the target value of the offset torque is calculated according to the maximum frictional force obtained through estimation and the running direction of the lift car this time. Through calculation and application of offset torque, the elevator control device can be more simply and effectively inhibit the vibration of the lift car in the course of vibration.

A control system for an electric vehicle has a vehicle speed calculation section that calculates a speed of the electric vehicle and a control unit that controls an inverter of an electric motor to provide road wheels with a predetermined reference torque in accordance with a manipulated valuable of an accelerator pedal, wherein the unit has a reference torque correction section that changes the reference torque from an original value and then returns the changed reference torque to the original value when a calculated speed of the electric vehicle is in a given speed range.

The invention provides a method for suppressing wind tunnel model vibration based on vision measurement technology, belongs to the technical field of wind tunnel experiments, and relates to a system and method for suppressing wind tunnel vibration in a wind tunnel test. The method adopts an industrial camera to shoot a vibration image of a wind tunnel model, and utilizes image high-speed real-time processing transmission technology of an FPGA vision measurement system to calculate a vibration displacement signal and converts the signal into an analog quantity to be fed back to a controller. The controller outputs a control signal, and through power amplification, realizes control of a piezoelectric ceramic actuator so as to achieve the purpose of active suppression of wind tunnel model vibration. The method adopts an FPGA-based vision measurement mode to measure a vibration signal of a wind tunnel model as a feedback signal for controlling the actuator to work, thereby effectively preventing interference of a high-voltage piezoelectric ceramic drive signal to a vibration measurement signal and hysteresis of an input signal generated by a filter. The method enables the control of the actuator to be stable and accurate, and improves an effect of suppressing wind tunnel model vibration.

The invention provides a compliant mechanism spatial configuration topological optimization method and relates to the technical fields of precise positioning and precise operation. The method comprises the steps that parallel mechanism structure parameters corresponding to compliant mechanism spatial configuration are optimized, and a differential equivalent method is adopted to obtain an optimized parallel mechanism Jacobian matrix; a topological optimization design domain is set according to driver settings of a parallel mechanism and multiple-input-multiple-output motion features, a non-design region in the design domain is delimited, and meshing is performed on a design region; the optimized parallel mechanism Jacobian matrix is fused into the topological optimization method, and topological optimization is performed on the compliant mechanism spatial configuration; and topological configuration is extracted. Through the method, while spatial multiple-degree-of-freedom motion feature requirements are met, the compliant mechanism spatial configuration with maximum overall stiffness can be obtained according to the nature of the topological optimization method, and the vibrationsuppression ability of a compliant mechanism itself is improved.

The invention discloses a wind power generating device, a tower tube and a method for restraining the tower shadow effect of the tower tube. The tower tube is provided with suction through holes running through the inner side and the outer side of the circumferential wall of the tower tube and distributed in the circumferential direction of the tower tube. The tower tube is further provided with a suction device which can suck the suction through holes from outside to inside. By means of the tower tube and the method, when the suction through holes of the windward side are sucked, the adverse effects of the tower shadow effect can be weakened or eliminated, the service life of a pitch bearing can be prolonged, noise can be reduced, and the wind energy utilization coefficient can be improved. When the suction through holes in the streaming disengagement direction are sucked, the vortex-induced vibration can be restrained; meanwhile, the suction force can be freely adjusted according to actual conditions during sucking, and higher flexibility is achieved; when the suction gas flow is discharged to the inside, the effect of heat exchange cooling and the effect of preventing external rainwater, dust and the like from entering a wind deflector or a hub can also be achieved.

The invention provides an ocean platform vibration absorbing energy feedback device based on a nonlinear energy sink and belongs to the field of deepwater marine drilling platforms. The ocean platformvibration absorbing energy feedback device based on the nonlinear energy sink consists of a platform, a swaying-surging nonlinear energy sink and a heaving nonlinear energy sink. The swaying-surgingnonlinear energy sink is mounted around the platform so that the swaying and surging of the platform can be reduced; and the heaving nonlinear energy sink is mounted under the platform so that the heaving of the platform can be reduced; structures such as mass blocks, springs, straight shafts and linear power generators are arranged in the swaying-surging nonlinear energy sink and the heaving nonlinear energy sink; the linear power generators are placed between the mass blocks and the straight shafts; when the platform is subject to a load to generate motion response, the springs drive the mass blocks to move on the straight shafts in a reciprocating manner; in the process, the linear power generators between the mass blocks and the straight shafts convert the vibration energy into electric energy so as to generate electric energy, which can be used by the platform, while the ocean platform motion response is reduced; and therefore, energy is sufficiently utilized.

The invention relates to a washing machine balance weight and a washing machine, and a weight balancing method of the washing machine, and relates to the technical field of washing machines. According to the technical scheme, the washing machine balance weight comprises at least one weight balancing cavity and one water pressurizing structure, wherein the cavity wall of the weight balancing cavity is provided with a water inlet which is used for connecting a water inlet pipeline and a water outlet which is used for connecting a water outlet pipeline. Each weight balancing cavity is internally provided with one water pressurizing structure so that water entering the weight balancing cavity can be located in an air-free sealed cavity. The washing machine balance weight is used for being fixed on a water containing drum of the washing machine. The washing machine comprises the washing machine balance weight. The weight balancing method of the washing machine comprises the step of adopting the washing machine balance weight to conduct mass-adjustable weigh balancing. The washing machine balance weight and the washing machine, and the weight balancing method of the washing machine are mainly used for lowing vibration and noises of the washing machine in work, and for reducing the production cost and transportation cost of the washing machine.

The invention discloses an F-shaped damping type vibration isolator free of a harmonic peak and a damping module thereof. The vibration isolator free of the harmonic peak is composed of a vibration damping module, the damping module and a connecting module; the vibration damping module comprises a hollow internal thread hexagon bolt, an internal thread sleeve and a main spring; the damping module comprises a waist-drum-shaped damping sleeve, an F-shaped damper, internal truncated cone-shaped pressing rings and truncated cone-shaped rubber rings; the connecting module comprises an upper end cover, internal truncated cone-shaped pressing rings, a lower end cover with a cylinder type embossment and a base; the base serves as a main frame of the vibration isolator, the lower end cover with the cylinder type embossment is connected to the lower portion in the base in a threaded mode, and two revolving curved faces are installed on the periphery of the waist-drum-shaped damping sleeve; and the oblique contacting faces of the F-shaped damper and the periphery of the waist-drum-shaped damping sleeve are different. In the F-shaped damping type vibration isolator free of the harmonic peak and the damping module thereof, the damping module is simple in structure, the F-shaped damping type vibration isolator exerts a good centering restoration effect on lateral vibration, and the harmonic inhibiting effect is strong.

A robot includes a robot arm and an inertial sensor provided in the robot arm. The robot arm is controlled using a weighting value for weighting output from the inertial sensor. In at least apart of a range in which the robot arm is movable, the weighting value is a first value when acceleration of the robot arm is first acceleration, and changes from the first value to a second value higher than the first value when the acceleration of the robot arm changes from the first acceleration to second acceleration lower than the first acceleration.

The invention discloses a combined sliding mode motion control method of a flexible mechanical arm. Under multiple time scales, the motion control problem of the flexible mechanical arm with disturbance and system uncertainty is researched. Because the flexible mechanical arm has a multi-time-scale characteristic, a controller designed by applying a traditional method is easy to cause an ill-conditioned numerical value problem, and based on a singular perturbation theory, the flexible mechanical arm is modeled into a singular perturbation system with singular perturbation parameters and decomposed into a fast subsystem and a slow subsystem which describe rigid body motion and flexible vibration. Under the slow time scale, with consideration of the influence of external disturbance and parameter uncertainty on the system, a self-adaptive sliding mode controller (slow controller) with a disturbance observer is designed to track the trajectory of the flexible mechanical arm. Under a fasttime scale, a robust sliding mode controller is designed to achieve flexible vibration suppression in order to eliminate the influence of vibration states and the like under an unmodeled dynamic scaleand a slow time scale on the design of the controller. Finally, the slow controller and the fast controller are combined by using a singular perturbation theory to realize a dual control target of trajectory tracking and vibration suppression. The test results show that the method is high in robustness and good in control effect.

The invention discloses a node vibration control method and device of a structure and an application of the device. A vibration controller with a digital signal processor (DSP) serving as a core is used, vibration response data of a certain node structure are received by a data acquisition module in the controller, a sum wi of the node structure is output after the vibration response data are analyzed by a display and control unit, the vibration response data of the node structure are converted into a frequency domain response signal Y(ejw), according to an improved feedback harmonic frequency suppression algorithm, amplitudes and phases of at least three orders of main sinusoidal components of the Y(ejw) are calculated, a frequency domain control signal U(ejw) is synthesized through a signal synthesis module under the assistance of a programmable logic device (PLD), and the U(ejw) is output to the node to control the vibration of the node, so that the response of the node is reduced, and the local suppression effect is achieved.

The invention discloses a stable adaptive fuzzy active vibration control method for a closely spaced structure, and the method comprises the steps: designing an adaptive fuzzy controller for a master mode of each stage based on an independent mode space; finally converting a solved mode control quantity into an actual control quantity. A fuzzy rule is based on analysis expression, thereby achieving the nonlinear mapping from the input of vibration information and the output of the control quantity. The method is simple and visual in calculation, introduces a projection algorithm for designing a parameter vector adaptive rule for the analysis of the fuzzy rule, and improves the uncertainty of a closely spaced structure model and the robustness of an overflow problem. Compared with a conventional control method, the method can effectively improve the vibration inhibition effect. Meanwhile, the method carries out the constraint of the boundary of a parameter vector, and prevents the excessive modification of the fuzzy rule from causing the instability. In addition, the adaptive rule of the parameter vector optimizes the nonlinear organization capability of the control quantity, reduces the demands for the control energy, well processes the conflict between the low controllability of the closely spaced structure and the limited actuation capability in active vibration control, and has an engineering practical value.

The invention discloses a multi-node network vibration abatement device and method. The multi-node network vibration abatement device comprises a display and control unit, a communication bus and a plurality of node abatement units. A personal computer (pc) serves as the platform of the display and control unit, all structural point transfer characteristic estimation and control frequency wi are transmitted to all the node abatement units through the communication bus, response of all structural points is monitored in real time, and accordingly the global control effect is achieved. A digital signal processor (DSP) serves as the core of the node abatement units, control signals U (ejw) are calculated through real-time iteration by measuring certain point structure response Y (ejw) in the improved feedback harmonic frequency abatement algorithm and the evaluation criteria that a mode of the structure response Y (ejw) is the minimum, response of a certain structural point is reduced, and accordingly the local abatement effect is achieved.

The invention provides an active and semi-active electromagnetic space vibration suppression system. The system is characterized in that each electromagnetic coil and corresponding permanent magnets are arranged on the same axis, and the same structures are symmetrically arranged so as to restrain vibration in the other direction; when a certain included angle exists between the symmetrical structures in the space, vibration of the three-dimensional space can also be restrained; when the electromagnetic coils or the permanent magnets can freely move on shafts, magnitude of direct currents in the electromagnetic coils is adjusted, so that the coils or the permanent magnets are always subjected to repulsive force to form electromagnetic springs; rigidity of the electromagnetic springs is adjusted, and then the inherent frequency of a device is adjusted; when the inherent frequency is the same as the vibration frequency of a separated system, vibration can be restrained in a semi-active mode; and when both the electromagnetic coils or the permanent magnets are fixed, the frequency and the amplitude of alternating currents in the electromagnetic coils are adjusted, then the active force can be formed, and the proper active force acts on the separated system, so that vibration can be actively restrained. According to the active and semi-active electromagnetic space vibration suppression system, the device is simple in structure, capable of restraining vibration in multiple directions, wide in effective working frequency band and diversified in change form.

The invention discloses a short-circuit winding based vibration suppression method of an iron core reactor. A short-circuit winding is arranged on a return yoke at one side of the iron core reactor, pulse vibration magnetic flux is generated in an iron core when an alternating current passes through a main winding of the iron core reactor, an electromotive force and a current are generated in the short-circuit winding by induction, the electromagnetic process of the short-circuit winding is the same as that of a secondary winding of a transformer in short circuit, total magnetic flux of turn chains of the short-circuit winding is formed by superposing magnetic flux passing through the short-circuit winding with magnetic flux generated by an induction current in the short-circuit winding, the magnetic flux passing through the short-circuit winding lags behind magnetic flux which does not pass through the short-circuit winding in a phase, an electromagnetic force exists between iron core cakes all the way, and thus, the vibration and the nose of the iron core of the reactor are greatly reduced; and theoretical analysis and experiment show that the short-circuit winding has an obvious effect on vibration suppression of the iron core reactor. The integral structure of the iron core reactor is not changed, the short-circuit winding is relatively low in a winding process requirement of the winding, and mechanical processing is facilitated.