| 摘要 |
PURPOSE:To suppress the noise of a dynamic exciter at a low level by compensating a phase by a secondary system on the basis of an acceleration signal from the exciter. CONSTITUTION:An input signal is applied to a phase compensating signal and an equalizing circuit both of which are formed by secondary systems respectively through a band pass circuit. Then, the equalized signal is applied to the exciter system through a low-pass filter and a DC interrupting circuit. The mechanical output of the dynamic exciter driven by said equalized signal is detected as an acceleration signal by a servo accelerator. The acceleration signal is amplified and then negatively fed back to the prestage of the phase compensating circuit by a negative feedback circuit. Consequently, the noise of the dynamic exciter is removed and suppressed. The phase compensating circuit is arranged so that its transmission function is included in a circular transmission function of a negative feedback control circuit. Thus, the noise of the dynamic exciter can be suppressed at a low level. |
