自動車フレームとフロアパネル間の解析SEAモデリング

抄録

Analytical Statistical Energy Analysis (Analytical SEA) examines coupling loss factor (CLF) between same dimensional subsystem such as between beam and beam, but not enough between different dimensional subsystem such as between beam and plate. And there is no article on the effect of hollow beam cross section deformation on vibration and noise. This paper applies analytical SEA to vibration propagation between hollow beam and plate at frequency without cross section deformation. Then an optimization is carried out structure with a mixture of beams and plates to Check its validity. A test structure is a hollow beam and a plate connected. At first vibration characteristics of the test structure are evaluated by FEM and it is shown to be divided into three types of predominant modes. Then most effective excitation direction in the vibration propagation from the hollow beam to the plate is evaluated, indicating that it is the same direction as the out-of-plane direction of the plate. Then CLFs of the test model is calculated by FEM-SEA and analytical SEA. It is shown effect of cross section deformation and both analytical SEA evaluation formulas are applicable. Finally, based on the findings obtained by the test mode, simplified model of a car frame and floor is Optimized by analytical SEA. and confirmed the vibration reduction effect using FEM.