There is provided a translation-rotation hybrid vibration control system for buildings, which includes a translation control unit and a rotation control unit. The translation control unit is provided on an external building structure. The rotation control unit is provided above the translation control unit. The translation control unit includes a fixed base, a first track plate, a first movable plate, a second track plate and a second movable plate. The rotation control unit includes a force-transfer base, a drive, a reducer, an output shaft, a rotary plate and a flange.

An electric motor control device that drives a control target load (mechanical load) includes a feedforward controller, a feedback controller, and an adder-subtractor. The feedforward controller receives a position command signal to specify a target position of the control target load and outputs a feedforward position command signal representing a target position of the electric motor, a feedforward speed command signal representing a target speed of the electric motor, and a feedforward torque command signal representing a torque necessary for the electric motor to perform an operation indicated by the target position or the target speed. The feedback controller receives the feedforward position command signal, the feedforward speed command signal, an electric motor position signal representing a position of the electric motor, an electric motor speed signal representing a speed of the electric motor, and outputs a feedback torque command signal representing a torque command to perform feedback control in such a manner that the electric motor position signal and the feedforward position command signal coincide with each other. The adder-subtractor subtracts a load acceleration feedback torque signal obtained by multiplying a load acceleration signal representing acceleration of the control target load by a load acceleration feedback gain from a torque command signal obtained by adding the feedforward torque command signal and the feedback torque command signal, and outputs a result of the subtraction as a torque command correction signal. The feedforward controller generates the feedforward torque command signal so as to previously compensate an effect of the load acceleration feedback torque signal that is subtracted from the torque command signal at a time of an acceleration-deceleration operation.

An electric motor control device that drives a control target load (mechanical load) includes a feedforward controller, a feedback controller, and an adder-subtractor. The feedforward controller receives a position command signal to specify a target position of the control target load and outputs a feedforward position command signal representing a target position of the electric motor, a feedforward speed command signal representing a target speed of the electric motor, and a feedforward torque command signal representing a torque necessary for the electric motor to perform an operation indicated by the target position or the target speed. The feedback controller receives the feedforward position command signal, the feedforward speed command signal, an electric motor position signal representing a position of the electric motor, an electric motor speed signal representing a speed of the electric motor, and outputs a feedback torque command signal representing a torque command to perform feedback control in such a manner that the electric motor position signal and the feedforward position command signal coincide with each other. The adder-subtractor subtracts a load acceleration feedback torque signal obtained by multiplying a load acceleration signal representing acceleration of the control target load by a load acceleration feedback gain from a torque command signal obtained by adding the feedforward torque command signal and the feedback torque command signal, and outputs a result of the subtraction as a torque command correction signal. The feedforward controller generates the feedforward torque command signal so as to previously compensate an effect of the load acceleration feedback torque signal that is subtracted from the torque command signal at a time of an acceleration-deceleration operation.

A power transmission device is disclosed. The power transmission device includes an input member, an output member, a dynamic vibration absorbing device, a rotation fluctuation detecting unit, and a control unit. The input member is rotatably disposed and configured to receive the torque inputted from a drive source. The output member is configured to output the torque, inputted to the input member, to a drive wheel. The dynamic vibration absorbing device is disposed in a power transmission path including the input member and the output member. The rotation fluctuation detecting unit is configured to detect information regarding a rotational fluctuation in at least one of the input member and the output member. The control unit is programmed to perform active control of the dynamic vibration absorbing device so as to reduce the rotational fluctuation based on the information regarding the rotational fluctuation detected by the rotational fluctuation detecting unit.

A power transmission device is disclosed. The power transmission device includes an input member, an output member, a dynamic vibration absorbing device, a rotation fluctuation detecting unit, and a control unit. The input member is rotatably disposed and configured to receive the torque inputted from a drive source. The output member is configured to output the torque, inputted to the input member, to a drive wheel. The dynamic vibration absorbing device is disposed in a power transmission path including the input member and the output member. The rotation fluctuation detecting unit is configured to detect information regarding a rotational fluctuation in at least one of the input member and the output member. The control unit is programmed to perform active control of the dynamic vibration absorbing device so as to reduce the rotational fluctuation based on the information regarding the rotational fluctuation detected by the rotational fluctuation detecting unit.

A vibration reduction (VR) human support has exactly two paths to ground in each degree of VR: one provided by respective displacement actuators (DAs) for active VR, the other by one or more elastomeric damping bodies (EDBs). These paths extend from a frame for carrying a support structure for a live human, to a grounding for fixing the VR system in a vibrating environment. Each EDB is composed of a material having a dynamic Young's Modulus of 0.1-2.5 MPa, and a resilience test rebound height less than 40, and is positioned between the grounding and frame to provide elastic restorative forces and damping in each of the respective directions. The use of EDBs simplifies construction, and allows for a more compact arrangement, without reducing VR efficiency.

A vibration reduction (VR) human support has exactly two paths to ground in each degree of VR: one provided by respective displacement actuators (DAs) for active VR, the other by one or more elastomeric damping bodies (EDBs). These paths extend from a frame for carrying a support structure for a live human, to a grounding for fixing the VR system in a vibrating environment. Each EDB is composed of a material having a dynamic Young's Modulus of 0.1-2.5 MPa, and a resilience test rebound height less than 40, and is positioned between the grounding and frame to provide elastic restorative forces and damping in each of the respective directions. The use of EDBs simplifies construction, and allows for a more compact arrangement, without reducing VR efficiency.

Systems and methods are provided for active vibration damping. One embodiment is a method for damping vibration in a mechanical system. The method includes detecting a vibration at a coupling of the mechanical system, generating a countervibration based on the detected vibration, and operating the mechanical system while generating the countervibration.

Systems and methods are provided for active vibration damping. One embodiment is a method for damping vibration in a mechanical system. The method includes detecting a vibration at a coupling of the mechanical system, generating a countervibration based on the detected vibration, and operating the mechanical system while generating the countervibration.

A power transmission device disposed in a path from a drive source to a wheel in a vehicle is disclosed. The power transmission device includes an input-side rotary member, an output-side rotary member, and a magnetic damper mechanism. A torque is inputted from the drive source to the input-side rotary member. The output-side rotary member is disposed to be rotatable relative to the input-side rotary member. The magnetic damper mechanism is configured to elastically couple the input-side rotary member and the output-side rotary member in a rotational direction by a magnetic force of attraction. The magnetic damper mechanism has a variable stiffness.