강성 효과 증대에 따른 중주파수 투과손실 예측

다국어 초록 (Multilingual Abstract)

NVH modeling of vehicles middle to high frequency range is known to be one of pending difficulties, partly due to high sensitivity of the structural and acoustic response of section of a vehicle. Currently most industries conduct noise analysis upto 200㎐ by the finite element method, while predicting airborne noise by SEA(Statistical Energy Analysis) for the frequency range of over 400㎐. However, the SEA is not a effective for predicting noise of a realistic structure shape except plate or simple curved shape, especially for low modal density of 100-400㎐ range. Although numerous methodologies to predict the mid frequency noise problem have been recently developed, none succeeds in claiming validity. In this paper, we tried to resolve the problem by a way of Hybrid Finite Element and SEA (Hybrid FE-SEA) method. As an application example, the transmission loss (TL) of 500㎜ X 500㎜ X 0.8㎜ panel for mid-high frequency (100-1,000㎐) is calculated under change of structural stiffness. Our research verified the effectiveness of Hybrid FE-SEA method for mid-high frequency.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. Hybrid FE-SEA 이론
• 3. Hybrid FE-SEA & SEA 해석
• 4. 결론
• References