THE USE OF RAY TRACING METHOD TO PREDICT SOUND TRANSMISSION ACROSS HEAVILY DAMPED PLATES UNDER THE FRAMEWORK OF STATISTIC ENERGY ANALYSIS (SEA)

摘要

Energy transmission across lightly damped structures has been well studied including the approved success of Statistic Energy Analysis (SEA) in mid and high frequency bands. For highly damped elements, one of the fundamental assumptions in SEA, energy equipartition. tends to fail. Energy attenuation with distance becomes more significant for such elements and hence the energy is less likely to be evenly distributed within those elements. A ray tracing algorithm is developed taking account of this phenomenon by tracking the travel history of a great number of discrete sound rays. A hybrid ray tracing and SEA prediction model is proposed to simulate the acoustic transmission across heavily damped plates and numerical validation on a five-plate system is conducted. Both classic and hybrid SEA models show good agreement for lightly damped system and differ for heavily damped system.