Abstract
Application of the modal filtering technique to active control of floor vibration under impact excitation is expected to be effective and advantageous in reducing the floor impact sound associated with the vibration. While the modal filtering technique relies on the premise that the modal shapes of the floor panel consist of real numbers, implying that proportional damping in the structural system, it is often the case that floor panels of actual practice in buildings do not obey this assumption. Complex modal shapes render the modal filtering technique ineffective. In this paper, a sensor layout design procedure to avoid this problem is developed. Verification tests are conducted to investigate the performance of the modal filtering based on the sensor location determined by the proposed procedure.
