PatentDOI
Method and apparatus for countering vibrations of a platform
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TLDR
In this article, a dynamic vibration absorber for reducing vibrations of a platform induced by an oscillating mass mounted thereon is provided by mounting a mass of equal mechanical resonant frequency as that of the oscillator mass and oscillating this mass in a manner to establish an equal and opposite vibration of the platform, thereby cancelling the vibrations induced by the oscillater mass.Abstract:
A dynamic vibration absorber for reducing vibrations of a platform induced by an oscillating mass mounted thereon is provided by mounting a mass of equal mechanical resonant frequency as that of the oscillating mass and oscillating this mass in a manner to establish an equal and opposite vibration of the platform, thereby cancelling the vibrations induced by the oscillating mass. In one embodiment, a signal from the oscillating mass representative of the frequency and amplitude of its mechanical oscillation is phase shifted and utilized as a driving signal to the drive motor of the absorber mass. In another embodiment, electrical signals representative of the platform vibrations are detected to provide phase and amplitude vibration error signals. These error signals are applied to a reference signal coupled to the drive motor of the canceller mass causing the oscillations of the canceller mass to induce vibrations in the platform which counter the vibrations induced by the oscillating mass.read more
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References
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Patent
Positioning stage having a vibration suppressor
Issei Imahashi,Teruo Asakawa +1 more
TL;DR: In this article, a first stage adapted to be moved in predetermined directions by a first driving device is provided in a machine base supported from a foundation by an intermediary of resilient means.
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Kazuhiro Izukawa,Kho Ishizuka +1 more
TL;DR: In this article, a driving circuit for a vibration wave motor is proposed, in which a periodic voltage is supplied to electromechanical energy converting elements to generate a travelling vibration wave in a vibrating member.
PatentDOI
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