DESIGN OF CHARGE/POWER AMPLIFIERS FOR MULTI CHANNEL ACTIVE VIBRATION CONTROL OF AIRCRAFT/AEROSPACE STRUCTURES

摘要

Multi-channel Active Vibration Control of a composite research wing model using peizoelectric Actuators/Sensors is investigated. The first three modes of the structure is to be actively controlled using the LMS based control law & PZT secondary actuators distributed on the structure. Requirements of the control loop calls for the design of charge amplifier for sensing signals from PZT sensors and power amplifier for actuating PZT actuators. These amplifiers require Dual Regulated Voltage Power Supply. This dual regulated power supply can be obtained either from AC source (AC to DC Converters) or DC source (DC to DC converters). The amplifiers can be operated from AC to DC converter for Ground based testing/control & from DC to DC converters (DC input = 28 VDC) for in - flight Test/Control. The amplifiers working from Aircraft power source necessitated the design of DC to DC converters. Fabrication of 8 channel charge amplifier and eight channel power amplifier has been completed. Using the designed hardware six channel control has been performed on the composite wing model using the online Filtered - X LMS control algorithm. The code has been implemented on the TORO - 16 DSP board. Single mode & multimode control has yielded reduction levels of the order of 35 dB & 18dB respectively. The results of this real time control experiment has been brought out.