Relation between Low-Vibration Design and Power Flow in SEA of Panel Structure

Abstract

This paper discusses a relation between subsystem energies and power flow in Statistical Energy Analysis (SEA) for vibration reduction. A test structure is coupling of several panel with 10 subsystems of flat steel plate. At first the optimization procedure is carried out to find a low-vibration structure by using analytical SEA (ASEA) in which coupling loss factors are theoretically evaluated. Then the relation between the subsystem energy levels and power flows from one subsystem to another in ASEA are discussed, and it is shown that the power flow is naturally transmitted from higher modal energy subsystem to lower. Next the optimized structure is tested to confirm low-vibration design by using FEM calculation. Also power flows in FEM-SEA of the optimized structure are evaluated to be compared with those in ASEA under high and low damping conditions. It is concluded that the power flows in FEM-SEA and Experimental SEA have the energy transmissions from subsystem with lower energy to another with high energy because of SEA subdivision way and having predominant modes as ordinary phenomenon.