Semi-active vibration control based on switchable transfer of bending moments: study and experimental validation of control performance

Abstract

This paper presents an experimental approach to assessment of semi-active vibration control systems based on the Prestress–Accumulation Release concept. The objectives are threefold: (1) to introduce an experimental validation method for control algorithms based on switchable transfer of moments, (2) to propose a method to assess experimentally the control effects on structural dynamic response under several types of excitation, and (3) to propose an approach for adequate sensor placement. A laboratory frame demonstrator equipped with dedicated semi-active nodes is used. The proposed approach is based on spectral responses and modal analysis. According to the presented findings, the investigated control is effective in reducing the vibration level while keeping the structural dynamic stiffness at a proper level. The investigation is conducted in the case of free response, as well as responses to impact loading and random excitation. The results confirm the accuracy of the adopted algorithm parameters and reveal the sensor locations that provide the best control effectiveness.