Title:
ACTIVE VIBRATION PREVENTION DEVICE AND CONTROL METHOD
Document Type and Number:
Japanese Patent JPH04195308
Kind Code:
A
Abstract:
PURPOSE:To eliminate the influence of the DC component in the output signal of the vibration prevention device, which includes the DC component in the output, upon a control system by adding a low-pass filter which has a proper cutoff frequency to an acceleration feedback loop. CONSTITUTION:A vibration prevention controller has an accelerometer 3 as a sensor and its output is sent to an amplifier through an LPF 5 and a proportional operation circuit to control a controlled system 2. When a piezoelectric accelerometer is used as the accelerometer 3, the accelerometer can measure acceleration about an inertia system although the accelerometer has a DC component, so when the acceleration is found from the differential value of a speed indicator, this is suitable as a sensor for vibration prevention control over a virtual fixed point. The LPF 5 operates as a phase delay element which has a constant gain (g) at a frequency below the cutoff frequency fc when the fc is set to a proper value.
Inventors:
TAKEHARA NAOKI
DAIROKU NORIYUKI
YAMADA TADASHI
DAIROKU NORIYUKI
YAMADA TADASHI
Application Number:
JP32276390A
Publication Date:
July 15, 1992
Filing Date:
November 28, 1990
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G01H17/00; F16F15/02; G05D19/02; G10K11/16; G10K11/178; (IPC1-7): F16F15/02; G01H17/00; G05D19/02; G10K11/16
Attorney, Agent or Firm:
Katsuo Ogawa