不同材質壘球棒之振動特性與性能評估

Vibration Characteristics and Performance Evaluation of Different Materials of Softball Bats

王栢村(Bor-Tsuen Wang) ； 林鴻裕(Hong-Yuh Lin) ； 戴偉哲(Wei-Che Tai)

《中華民國振動與噪音工程學會論文集》 2008 (2008/05) Pp. 251-260

https://doi.org/10.30028/CSSVANNUAL.200805.0251

摘要

本文主要是針對木製、鋁製及合成球棒進行實驗模態分析及理論有限元素分析，以獲得三種不同材質球棒之振動特性。首先以有限元素法對有限元素模型進行模態分析，得到理論模態參數。接著進行實驗模態分析，得到實驗模態參數，包括自然頻率、模態振型及阻尼比，將理論與實驗之模態參數進行比較修正可得驗證之模型。驗證成功之球棒有限元素模型可視為一等效模型，同時藉由球棒的模態振型探討球棒之振動特性，探討甜蜜區與打擊區的位置，並分析比較三種不同材質球棒之性能。而此經過驗證成功之球棒模型也可以用來作球棒其他性能指標應用分析的研究及球棒設計變更之參考。

關鍵字

有限元素分析 ； 實驗模態分析 ； 壘球棒

並列摘要

This paper presents both finite element analysis (FEA) and experimental modal analysis (EMA) to study three types of softball bats made up with wood, aluminum and synthetic material for their vibration properties. First, FEA and EMA are performed, respectively, to obtain theoretical and experimental modal parameters, including natural frequencies, mode shapes and modal damping ratios. Base on the experimental results, the FE model can be modified to fit the modal properties and therefore the analytical model can be validated and equivalent to the real bats. The structural mode shapes of bats are also studied to show the ”sweet spots” for better hit areas. The performance among the three bats is compared to reveal the feel of players. The validated FE model can also be applied to perform other analysis, such as impact, as well as design modification of baseball bats.

並列關鍵字

Finite element analysis ； Experimental modal analysis ； Softball bats