935results about "Mechanical oscillations control" patented technology

A digital processing link for a vibration control system collects sensor signals at a transfer station and combines the sensor signals into a collective signal that is transmitted under a digital communications protocol to a base station. The sensor signals are separated at the base station and individually processed to produce one or more output control signals to actuators for counteracting the measured vibration.

A position control method for controlling a position of a movable portion, includes: performing control of allowing the movable portion to approach a predetermined position by moving the movable portion; and performing control of moving the movable portion to the predetermined position by moving the movable portion and detecting a relative position of the movable portion with respect to the predetermined position by using an imaging unit.

The invention concerns a system for active reduction of rotational nonuniformities of a shaft, especially the drive shaft (10) of an internal combustion engine or a shaft that is coupled or can be coupled to it, with at least one electric machine (4), which is coupled or can be coupled to the shaft, wherein the electric machine (4) is controlled such that it generates a rapidly varying torque, to reduce the rotational nonuniformities, and it superimposes on this torque a positive or negative torque in order to further achieve a driving action or braking or generator type action. The invention is also oriented to a corresponding method for active reduction of rotational nonuniformities.

A portable terminal apparatus (electronic apparatus) includes a plurality of vibration devices, disposed at different positions, which generate vibrations, and a control unit that independently controls frequencies or strengths of the vibrations generated by the plurality of vibration devices for each of the vibration devices.

Noises that are to be emitted by an aerial vehicle during operations may be predicted using one or more machine learning systems, algorithms or techniques. Anti-noises having equal or similar intensities and equal but out-of-phase frequencies may be identified and generated based on the predicted noises, thereby reducing or eliminating the net effect of the noises. The machine learning systems, algorithms or techniques used to predict such noises may be trained using emitted sound pressure levels observed during prior operations of aerial vehicles, as well as environmental conditions, operational characteristics of the aerial vehicles or locations of the aerial vehicles during such prior operations. Anti-noises may be identified and generated based on an overall sound profile of the aerial vehicle, or on individual sounds emitted by the aerial vehicle by discrete sources.

An unbalance identification and vibration suppression control system for a magnetic suspension rotating machinery comprises an unbalance identification module, an unbalanced force compensation module, a magnetic bearing power amplifier, an electromagnet rotor and a displacement sensor. Based on stable control of a magnetic suspension rotor, the unbalance of a magnetic bearing is identified in an online manner by a novel wave trap based on coordinate transformation, on one hand, the identification amount is used for compensating common-frequency current stiffness force, on the other hand, proper common-frequency current stiffness force is generated according to the identification amount to compensate common-frequency displacement stiffness force, and the influence of the low-pass characteristic of the power amplifier on compensation precision of the common-frequency displacement stiffness force is eliminated by leading a simplified inverse model of the magnetic bearing power amplifier into a feed-forward channel. When the magnetic suspension rotor rotates at a high speed, common-frequency bearing force is greatly reduced, and unbalanced vibration of the magnetic suspension rotor is remarkably suppressed. The unbalance identification and vibration suppression control system is simple, convenient, easy and particularly suitable for an actual high-speed magnetic suspension rotor system.

This invention allows for remote monitoring of the skier/skiing performance. The system consists of a various MEMS sensors embedded in skier clothing and equipment. These sensors measure instantaneous changes in acceleration in x/y/z axis and changes in earth magnetic field—relative to the skier position, to provide six degree of freedom in calculation of skier position as well as moments applied to the ski edge and forces experiences by the skier body. These sensors communicate with the monitoring application residing in the user wireless terminal (call phone) over the PAN wireless network. The instantaneous measurements are analyzed either locally or remotely and when the system is configured in an active mode, a corrective response to the MEMS actuators embedded in the ski or ski bindings may be send does changing the parameters of the run or provide enhanced safety.

A system and method for actively damping driveline oscillations in a motor vehicle having a traction motor to drive a vehicle's drive wheels and an antilock brake system (ABS). A traction motor controller controls a torque output signal of the motor to effectively to dampen driveline oscillations during an ABS operation. A proportional, a proportional derivative, or a derivative controller may be used to generate the torque output signal based on at least one of motor speed, an average of the drive wheel speeds, a difference in the two speeds, a motor angular acceleration, an average wheel angular acceleration, and a difference in the angular accelerations. Motor speed signals and average drive wheel speed signals may be filtered to eliminate high frequency components of each speed signal. Additionally, amplitude of the torque output signal may be limited within a positive upper and a negative lower active motor damping limit.

The invention relates to a harmonic current suppression method for a magnetic suspension rotor system based on a self-adaptive repetitive controller. The harmonic current suppression method comprises the following steps: firstly establishing dynamical models for the active-passive magnetic suspension rotor system containing unbalance and sensor harmonic waves, secondly designing the self-adaptive repetitive controller, and giving out the harmonic current suppression method according to the characteristics of the active-passive magnetic suspension rotor system. The method is suitable for harmonic current suppression of an active magnetic bearing coil of the active-passive magnetic suspension rotor under the condition that unbalance mass and the sensor harmonic waves exist, and is high in precision and high in rate of convergence.

The invention discloses a method for actively controlling multi-frequency vibration of a helicopter, including system identification, collecting the control voltage of the actuator and the acceleration response at the controlled point, using the recursive least squares algorithm for system identification, and finally obtaining the discrete state space of the secondary channel Equation; feedback controller design, using the secondary channel discrete state space equation obtained in step 1 to carry out discrete predictive sliding mode feedback controller design; reference signal and error signal acquisition, according to the helicopter rotor characteristics and speed characteristics, extract the rotor excitation frequency, synthesize reference signal, and collect the vibration response error signal at the controlled point; the feedforward-feedback hybrid control algorithm iterates, and uses the reference signal and error signal obtained in step 3 to iterate the feedforward controller and the feedback controller to obtain the feedforward-feedback Feedback the mixed control voltage signal; output the control quantity; use the mixed control voltage obtained in step 4 as the input signal at the next moment, drive the actuator to produce the required response, and return to step 3.

A damping apparatus for an automobile is provided, capable of ensuring a high level of reliability while obtaining excellent damping effect with simple configuration. The damping apparatus for an automobile that reduces vibrations of an automobile body may include an actuator that is attached to the automobile body and drives an auxiliary mass; a current detector that detects a current flowing through an armature of the actuator; a section that detects a terminal voltage applied to the actuator; a calculation circuit that calculates an induced voltage of the actuator, and further calculates at least one of the relative velocity, relative displacement, and relative acceleration of the actuator, based on a current detected by the current detector and the terminal voltage; and a control circuit that drive-controls the actuator based on at least one of the relative velocity, relative displacement, and relative acceleration of the actuator calculated by the calculation circuit.

In a motor-assisted hybrid vehicle, an active vibration control system suppresses torque fluctuations of an engine without detriment to the response of a static torque. An adaptive notch filter outputs a control signal depending on a harmonic basic signal generated by a basic signal generator from a rotational frequency of a crankshaft. A combiner combines the control signal with a drive signal for the generator motor and supplies the combined signal through a power controller to the generator motor. The basic signal is supplied to corrective filters having the transfer function of the generator motor to output a reference signal. The filter coefficient of an adaptive notch filter is successively updated so that an error signal representative of a rotational speed fluctuation of the crankshaft will be minimized.

A monitoring system for monitoring the temperature and vibration of equipment, comprising a central digital computer, a MESH communication network, wherein the network feeds signals to the central digital computer, a plurality of heating elements for heating the equipment, temperature/vibration sensors adapted to measure the temperature of the equipment, wherein each sensor is adapted to provide a signal representing the temperature/vibration of the piece of equipment to which the sensor is associated, to the network, wherein each temperature/vibration sensor can also be used to control the electric heaters, a temperature sensor that monitors the ambient temperature of the facility, and current transducers associated with the heaters, to monitor the energy use and current loss of the heaters, wherein the central computer uses the data it receives from the other elements of the monitoring system to determine when the equipment is not at the correct temperature/vibration and diagnoses the reason why.

An active vibration control system including a sensor responsive to a source of vibration and which provides an output signal representative of the vibrations; at least one actuator positioned to impart canceling vibrations to the source of vibrations based on an input signal; a correction subsystem responsive to the actuator for estimating the sensor output in the absence of the canceling vibrations and which outputs a corrected output signal representative only of the vibrations emanating from the source; and a state space predictor responsive to the corrected output signal for determining the input signal to the actuator based on variations in the corrected output signal to better control vibrations especially in chaotic systems.

A method for controlling a powertrain of a vehicle with wheels during a traction control event is provided. The method comprises adjusting wheel torque in response to an amplitude of a band-pass filtered driven wheel speed and a direction of acceleration of driven wheels.

A system for damping audible noise from a drive train. One embodiment is a system with an audible noise signal from a drive train wherein a damping circuit produces a damping torque that is a phase shifted and amplified version of the noise signal that is applied to the air-gap torque of a generator or motor coupled to the drive train and effectively reduces the audible noise.