板結構非共振響應幅之統計能量分析

Non-Resonant Response Amplitude of Plate Structure Using Statistical Energy Analysis

傳統的統計能量法，無法考慮結構非共振振型的影響，本文以修正的統計能量模型分析迴響室內被聲激勵的板振動響應幅，對阻尼值不同的鋁板以及玻璃纖維板，計算板振動的非共振響應幅，並分別進行實驗量測，而考慮非共振響應的理論預估值，與實驗結果得到相當良好的一致性。對於阻尼值較低的鋁板，板結構的非共振響應的值皆低於共振響應，即使忽略非共振響應計算的傳統的統計能量模型，其預估值也與實驗值相當接近，沒有明顯差異，而提昇阻尼值，會提高非共振響應在聲激勵板振動響應中的比重，本文以實驗驗證，對於阻尼值較高的玻璃纖維板，以傳統統計能量分析會造成非常明顯的誤差。 The limitation of conventional SEA model is considering only the resonant part of structural response to acoustic excitation. A modified SEA model with considering the non-resonant part is expected to improve the estimation of response. It is verified experimentally in this paper, with two different material properties of test plates hung in chamber. The results show that the predictions of the conventional SEA model and the modified SEA model both match well with the experimental results for low damping plate. With increasing damping of the plate, the proportion of non-resonant part of structural response increases. For high damping plate, conventional SEA modeling lead to significant errors with experimental results, while modified SEA modeling match well.