SYSTEM AND METHOD FOR DAMPING STRUCTURAL MODES USING ACTIVE VIBRATION CONTROL

摘要

Active vibration control system of a construction of a first and second structural element (M1,M2) and a first and second resilient element (U1,U2), and equipped with an actuator (L1), a controller (CL) and at least one sensor (G1,G2). The first structural element is connected to a base through the first resilient element. The actuator is mounted between the first structural element and the base. The second structural element is connected to the first structural element through the second resilient element. In open loop, the system has an open loop frequency response with a gain 0 dB both at a suspension mode frequency (Wp) and at a structural mode frequency (Ws). Above the structural mode frequency (Ws), the response displays a 0 dB crossing with a negative slope at a 0 dB crossing frequency. Actuator, controller and sensor form a control loop. The sensor measures the vibration of the first and/or second structural element, and provides a vibration signal to the controller. The controller provides a compensation signal to the actuator, which provides an actuating force based on the compensation signal. Values of amplifier bandwidth and sensor bandwidth are selected above the crossing frequency to obtain a stable control loop and to damp suspension and structural modes.