縮尺發動機振動與疲勞壽限之研究

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/2684

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/2684

Title:	縮尺發動機振動與疲勞壽限之研究
Authors:	李鎮源;Jeng-Yuan Li
Contributors:	機械工程研究所
Keywords:	縮尺發動機藥柱;隨機振動;頻率響應;響應頻譜;疲勞壽限預測;Fatigue Life Prediction;Response Spectrum;Frequency Response;Random Vibration;Reduced Scale Solid Propellant
Date:	2006-06-28
Issue Date:	2009-09-21 11:53:31 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本研究以縮尺發動機藥柱結構(以下簡稱為縮尺發動機)為對象，探討該結構件於室溫狀態下，受到飛彈掛載振動頻譜作用下之動態特性。試驗結果不僅量測到縮尺發動機之應變、加速度、試片溫度等資料，同時並將試驗結果與有限元素模擬結果進行頻率響應與隨機振動之分析比對，以證實本研究所建立之有限元素分析方法的適用性。另外，研究中並進行藥柱疲勞壽限預測模式的評估，探討藥柱於掛載振動頻譜負荷下之疲勞壽限評估技術。其研究方法是參考飛彈掛載功率頻譜，依照等能量理論進行逆傅立葉轉換為時域訊號，再輸入MTS萬能試驗機進行變動應力振幅疲勞試驗。同時，加入時域及頻域疲勞壽限分析等兩種疲勞損傷分析之比對，期以建立一套合適的疲勞壽限預測模式。由分析結果可得知，時域分析法與頻域分析Narrow Band方法的預測結果，較為接近實際試驗結果，兩者皆在試驗值之三倍誤差內。經由本研究所得之研究成果，不僅建立藥柱結構於有限元素模擬分析技術外，同時獲得藥柱疲勞壽限預測之最佳方法，相信可提供後續在飛彈發動機藥柱結構於設計建造與安全分析之參考依據。 This thesis investigates the dynamic characteristics of reduced scale solid propellant and fatigue life of solid propellant specimen under spectrum loading. The acceleration and strain responses were analyzed with finite element method and were compared to those of experiments. The outcome proved that the present FEM model is suitable and reliable. Moreover, the fatigue experiments were enforced on a MTS machine, and the fatigue life of solid propellant under spectrum loading was analyzed with stress-life method and four kinds of frequency domain methods. The results show that stress-life method and “Narrow Band” method were more suitable for solid propellant.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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