| 摘要 |
PURPOSE:To obtain the effect of preventing damage or the like due to resonance by fixing the action of a vibration isolating means when an input frequency is below 2<1/2> times as many as the resonance frequency of a vibrated system, and releasing the above-mentioned action when the input frequency is above 2<1/2> times as many as the above-mentioned resonance frequency to control the vibration of the vibrated system. CONSTITUTION:When vibration occurs in a vibrated body 6, its frequency is detected by a vibration sensor 22. and a signal corresponding to the above-mentioned frequency f is inputted into an output signal generator 20. The inputted frequency f is judged on whether it exceeds 2<1/2> times as many as the resonance frequency fn of a vibrated system or not. When the frequency f does not exceed the above-mentioned value, the generator 20 does not output a control signal, and an electromagnetic solenoid 18 therefore keeps OFF state. When the frequency f exceeds the above-mentioned value, the generator 20 outputs the control signal, and the solenoid 18 therefore changes into ON state to make a pair of control levers 16 change into an about horizontal state against the energizing force of a spring 19. Consequently, an inner tube 11 and a case 9 move relatively according to vibratory input to make the vibrated system resonanceless extending over the whole frequency range. |
