Modularer Schwingungskraftgenerator und Verfahren zu dessen Betrieb

摘要

A modular vibratory force generator (10, fig 1) is mounted on a helicopter fuselage and includes a plurality of force generating modules 12 and a closed-loop servocontroller having a signal processor 36, a summing point 38 and a motor drive amplifier 39. Each module 12 has a pair of counter-rotating eccentric masses 20, 21 that are driven by a motor 28 and are arranged to exert a fixed-amplitude variable-phase individual force at spaced locations on the fuselage. These forces F 1 , F 2 combine to exert a controllable-amplitude resultant force on the fuselage. The processor 36 is supplied with a single sinusoidal control signal which is divided into two output signals * small Greek theta * - * small Greek alpha * and * small Greek theta * + * small Greek alpha * by the processor 36. Each output signal is applied to the summing points 38, 38' and then to the motor 28, 28', via amplifier 39, 39', which causes the masses 20, 21 to produce a resultant vibratory force that is identical to the frequency and phase of the control signal and is proportional to the amplitude of the control signal. A transducer 40 monitors the position of the masses and provides a feedback signal via line 41 to the summing point 38.