- 會議論文
簡諧響應分析之阻尼模擬
Simulation of Damping Effects for Harmonic Response Analysis
摘要
理論振動分析包含四種類型：模態分析、簡諧、暫態及頻譜響應分析，模態分析可忽略阻尼效應，其餘須加入阻尼效應，而阻尼效應之阻尼比須由實驗取得。本文首先分別簡介比例黏滯阻尼多自由度系統之模態分析與簡諧響應分析，再介紹不同阻尼模型之理論模型，特別針對ANSYS軟體阻尼設定指令做對應之使用說明。本文也探討一實際的懸臂樑結構，籍由實驗模態分析可求得其結構模態阻尼比，接著探討由實驗阻尼數據導入不同阻尼模型之設定，以能進行簡諧響應分析求得系統之頻率響應函數，並比較不同阻尼模擬方式對頻率響應函數之影響，本文最後提出可應用於各種工程結構實務問題，能包含阻尼效應的頻率響應函數之實務模擬程序與方式。
並列摘要
Vibration analysis contains four types of analyses, i.e. modal analysis, harmonic, transient and spectrum response analyses. Normal mode assumption neglecting damping is generally adopted for modal analysis and adequate for structural calibration to identify structural modal parameters. Other analyses should include structural damping effects for accurate and reliable simulations. This paper briefly presents the modal analysis and harmonic response analysis for both proportional and non-proportional viscous damping multiple degree-of-freedom (MDOF) systems, respectively. Different damping models are then introduced. In particular, the related commands in ANSYS are shown and compared for their usages. A practical cantilever beam structure is also considered to perform EMA so as to obtain the structural modal damping ratios. This work shows the procedures to determine the frequency response function (FRF) via harmonic response analysis by including damping effects for different damping models base on experimental damping data and compares the differences of FRFs. This work finally summarizes and proposes the procedures for FRF simulation including damping effects that is useful for practical applications.