組合結構之模擬與模型驗證

Simulation and Model Verification of Assembly Structures

謝宗廷(Tsung-Ting Hsieh)

指導教授 ： 王栢村

國立屏東科技大學/工學院/機械工程系所/碩士(2012年)

https://doi.org/10.6346/NPUST.2012.00127

摘要

本研究探討組合結構之有限元素模型建構方法，主要探討的組合件有螺栓鎖固、線性滑軌及斜楔緊裝配。研究中應用實驗模態分析的手法，確認有限元素模型之系統響應能等效於實際結構，首先驗證零組件之有限元素模型，再進行組合件有限元素模型堆疊。研究中以樑元素施加初始應變以模擬實際螺栓鎖固效應；以面對面接觸元素模擬線性滑軌滾珠接觸效應；以設定斜楔位移限制模擬斜楔緊裝配效應。結果顯示以樑元施加初始應變可確認模擬實際螺栓鎖固效應；面對面接觸元素設定可探討線性滑軌之模態振型；斜楔位移限制設定可確實模擬斜楔緊裝配效應。透過本研究所建立之組合件有限元素模型，可應用於後續響應預測，探討結構之系統響應，進行設計變更，協助國內工具機產業之結構設計開發，縮短開發時程，預測結構系統響應，以及提升國內產業界設計製造及創新開發能力。

關鍵字

螺栓鎖固 ； 斜楔緊配合 ； 有限元素分析 ； 實驗模態分析 ； 模型驗證

並列摘要

This work discusses the analytical approach for assembly structures by finite element method (FEM). The assembly structures including those types of assembly by bolt-jointed, linear guide and tight-fitting with slanting wedge are studied in this work. Experimental modal analysis (EMA) is adopted to validate the finite element model of the practical assembly structure. First, the finite element model for each individual component is constructed and verified by comparing modal parameters obtained from both finite element analysis (FEA) and EMA, respectively. The FE models of components can then be stacked piece-by-piece to get the assembly structure FE model that is also validated by EMA approach. The bolt-jointed structure is simulated by using the beam element with initial strain effect for emulating the bolted condition. Results show the bolted effect can be well simulated. For linear guide assembly structure, the face-to-face contact element pairs are used to simulate the ball contact. The FE model for the linear guide assembly structure can only fit the structural mode shapes but not well for natural frequencies. The simulation of tight-fitting structure by slanting wedge is also successful in terms of good comparison between theoretical and experimental modal parameters. The structural FE models for different types of assembly structures are successfully constructed and validated. The well verified FE models can then be applied for further analysis such as response prediction and design modification, if necessary. The studied assembly structures are typical in machine tools. The simulation techniques in establishing FE models for various types of assembly structures can be applied to general structures as well. The developed analytical approach will help the design and manufacture abilities for domestic industries in research and development.

並列關鍵字

bolt-jointed ； tight-fitting structure by slanting wedge ； finite element analysis (FEA) ； experimental modal analysis (EMA) ； model verification (MV)

參考文獻

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