IMPROVED METHOD OF AN APPARATUS FOR CANCELLING VIBRATIONS FROM A SOURCE OF REPETITIVE VIBRATIONS

摘要

Primary vibrations (P) from a repetitive vibration source (1) are canceled in a region (2) using specially generated secondary vibrations (S) which are sent to the region (2) from a device d 'actuation (6). The actuator (6) is driven by a waveform generator (4) which is synchronized with the source (1) by a synchronization signal on the line (7) which is derived other than from the source ( 1). In figure (2), the synchronization signal is derived from the output of a residual vibration detector (3) via a filter (9) or a phase locked loop (Figs. 3 and 4).