- 學位論文
壘球棒之振動特性與性能評估
Vibration Characteristics and Performance Evaluation of Softball Bats
摘要
本研究的目的在於建立以振動特性為基礎之壘球棒性能指標之評估模式，並對現有之球棒進行設計驗證，首先以有限元素分析(finite element analysis, FEA)進行壘球棒之振動特性分析，得到理論模態參數與頻率響應函數，並進行壘球棒之實驗模態分析(experimental modal analysis, EMA)，得到實驗模態參數，包括自然頻率、模態振型及阻尼比，之後結合FEA與EMA求得之模態參數進行模型驗證，以確認分析模型、方法之合理性與正確性。建立整合CAD/CAE/CAT之虛擬測試(virtual testing)技術於壘球棒之設計分析，未來將可應用所建立的標準分析作業流程於其他壘球棒之開發設計，可縮短研發時間與成本。最後建立以振動特性為基礎之壘球棒之性能指標之評估模式，可作為選擇球棒之評估方式與球棒設計變更的參考依據。本研究所建立之分析及虛擬測試技術之理念，將可提供於球棒產業之應用，以利於產業界及代工廠提昇自我競爭力及自行研發產品之需求。
並列摘要
This work aims to establish the evaluation model of softball bat performance index base on vibration characteristics. First, finite element analysis (FEA) is adopted to study the vibration properties of softball bats and obtain theoretical modal parameters and frequency resoponse function (FRFs). Experimental modal analysis (EMA) is also carried out to determine the modal parameters of softball bats, including natural frequency, mode shapes and damping ratios. Both FEA and EMA results are combined to perform modal verification so as to validate the analytical model for its correctness. This work integrates CAD/CAE/CAT for virtual testing technique applied to design analysis of softball bats. The developed analytical proceduce can be useful for R&D of softball bats to reduce the time and cost. Finally, the evaluation model on the softball bat’s performance base on vibration characteristics is developed and can be used for design modification. Two work establishes the analysis and virtual testing technique applied to softball bats and will be beneficial to industry and OEM factories to promote their competitiveness and suit the needs in the innovation of new products.