利用有限元理論，對某承受動態(tài)載荷產(chǎn)品中的關鍵支撐件——支架建立了有限元模型，并進行模態(tài)分析，計算了前六階模態(tài)參數(shù)(固有頻率和模態(tài)振型)。通過與試驗模態(tài)分析的方法獲得的模態(tài)參數(shù)相比較，證明計算結果是合理的，提出了對結構的修改意見以提高結構的動態(tài)特性。
關 鍵 詞 模態(tài)分析; 有限元; 動態(tài)性能; 支架

Abstract According to the theory of finite element,the finite element model of the bracket ,a key supporting part in a product subjected to dynamic load, is established for modal analysis and the first six order modal parameter,including natural frequencies and viberation modes, is caculated.By comparing the caculated result with the experimental result,the caculated result is proved to be reasonable.Finally, some structure modifications are made to improve the dynamic behaviour of the bracket.
Key words modal analysis; finite element method; dynamic behaviour; bracket