On reducing vibration transmission in a two-dimensional cantilever truss structure using geometric optimization and active vibration control techniques

Four optimization strategies were used to improve the average vibration isolation between the base and the end of a 10-m long two-dimensional (2D) cantilever truss structure. These were combinations of optimizing the structure geometry and the application of active vibration control (AVC) with optimal actuator positions. A power distribution analysis to investigate the mechanisms by which each strategy achieves reductions in the vibration transmission is reported. The trade-off is also explored between the freedom allowed in the size of the geometric changes and the number of actuators used in an AVC system to achieve a given level of vibration attenuation. (C) 2001 Acoustical Society of America.