Model Expansion of Experimental Vibration Data for Numerical Acoustic Radiation Prediction

Translated Titles





Pierre Guisset;Marc Brughmans

Key Words


Volume or Term/Year and Month of Publication

1995(1995 / 06 / 24)

Page #

165 - 170

Content Language


Chinese Abstract

振動結構之聲響幅射預測傳統上都是利用聲學邊界元素法,假若對系統的動態行為非常了解,此種預測會有不錯的結果。本文即在說明實驗振動分析與數值聲響幅射預測之整合。此種方法包含三個步驟:(1)量測振動體表面之振動量,(2)以有限元素模式之模態資料將實驗數據展開至數值模式,(3)以邊界元素分析計算聲響幅射場。 由此整合,動態行為可以儘可能地被精確地定義,進爾邊界元素就可以應用於廣泛的範圍(如聲響分佈及敏感度分析等)。本文將以一個實際的應用實例(汽車引擎)來說明及驗證此一方法。

English Abstract

The prediction of the acoustic radiation of vibrating structures is traditionally based on the acoustic boundary element method. This approach leads to good predictions, provided that the dynamic behavior of the system is well known. This paper presents the integration of experimental vibration analysis with numerical acoustic radiation prediction. The developed methodology involves several steps: (i) measure the accelerations on the surface of a vibrating body, (ⅱ) expand these experimental data onto a numerical model, using the modal information of a finite element model, and (ⅲ) run a boundary element analysis to determine the acoustic radiated field. This procedure presents the advantages that the dynamic behavior is as accurately as possible defined and that the boundary element approach opens wide results interpretation (contribution and sensitivity analysis...). A real-life application example (car engine) is shown to illustrate and validate the developed methodology.

Topic Category 基礎與應用科學 > 物理
工程學 > 市政與環境工程