The invention relates to a method for operating a centrifugal device. The invention furthermore relates to a centrifugal device. The centrifugal device is provided with a drum which can be driven at a variable speed of rotation, with a frame and with vibration dampers arranged between the frame and the drum. The invention furthermore relates to a computer program product.

An energy-supply rotary inertia driver system for an offshore platform includes an annular fixed plate, an active control module, a wind power generation module and a solar power generation module. The system can monitor a motion state of the offshore platform in real time, and can generate a force through the active control module if necessary to apply a force torque of the offshore platform to further achieve the vibration suppression. Moreover, when the offshore platform is under normal operation, the system can act as an energy supply device via wind and solar power generation to feed electric energy to the active control module and other electrical equipment on the offshore platform when needed.

It is provided a steering wheel for a motor vehicle having a steering-wheel frame and at least one element for setting the vibration frequency and/or the inertia of the steering wheel. The at least one element is electrically conductive and is part of a sensor element.

The present disclosure relates to a method of tuning an electric charge extraction circuit of a vibrational energy harvester having a mechanical resonator, the method comprising varying, during a first phase, first and second parameters (.sub.1,.sub.2) of the electric charge extraction circuit based on detected harvested power (P.sub.HARVEST), each of the first and second parameters (.sub.1,.sub.2) influencing the amount of damping of the mechanical resonator and at least the first parameter (.sub.1) influencing the resonance frequency of the mechanical resonator, wherein the first and second parameters (.sub.1,.sub.2) are varied during the first phase such that the amount of damping remains constant or varies by less than a first significant amount and the resonance frequency reaches a final level.

A camera lens suspension assembly includes a support member including a support metal base layer formed from a first unitary metal component, comprising a bearing plate portion in the support metal base layer. The assembly also includes a moving member including a moving metal base layer formed from a second unitary metal component and mounted to the support member, comprising a moving plate portion in the moving metal base layer, and flexure arms in the moving metal base layer extending from the moving plate portion and coupled to the support member. The assembly further includes a plurality of bearing-retaining recess between the bearing plate portion of the support member and the moving plate portion of the moving member, and ball-bearings within the bearing-retaining recesses, and between and engaging the bearing plate portion and the moving plate, to enable movement of the moving member with respect to the support member.

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.

An active tuned mass damper applied to the offshore monopile wind turbine belongs to the field of marine technology. A mass block is connected to the inner wall of the tower through a spring. The two ends of the damper and the force actuator are connected to the mass block and the inner wall of the tower, respectively. When the installation of tower is finished, the spring and the damper begin to work. The movement of mass block will partly offset the movement of the tower caused by the wave force. The force actuator starts to work before the mating. The exact position of the nacelle can be obtained from the Global Positioning System (DGPS). The position of tower can be adjusted in the horizontal plane through the force actuator. So, the offshore installation time for nacelle will be saved. The whole installation time and cost will also be reduced.

An apparatus and method for damping haptic vibrations. A haptic output device is positioned within a device housing. The haptic output device has a haptic actuator and a haptic mass, the haptic mass being movable relative to the housing. A damper is positioned within the device housing. A controller is programmed to generate and deliver a haptic signal to the haptic actuator at a first time, and to generate and deliver a damping signal to the damper at a second time, the second time occurring after the first time. The method comprises moving a haptic mass, the haptic mass position in a housing; vibrating the housing in response to moving the haptic mass; damping movement of the haptic mass after a period of time; and substantially eliminating vibration of the housing in response to damping movement of the haptic mass.

A motion sickness control system for a vehicle includes a vibrator. The motion sickness control system includes a sensor configured to measure vibration of the vehicle. The motion sickness control system includes a computer having a processor and a memory storing instructions executable by the processor to actuate the vibrator at a target frequency based on the measured vibration of the vehicle. The target frequency attenuates the measured vibration of the vehicle.

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.