高速帶鋸機之結構分析與振動控制

Structural analysis and vibration control of high-speed bandsaw

蔡孟皇(Meng-Huang Tsai)

指導教授 ： 林維新

國立虎尾科技大學/工程學院/創意工程與精密科技研究所/碩士(2011年)

https://doi.org/10.6827/NFU.2011.00042

摘要

本研究主要針對帶鋸機的結構分析與振動控制，利用有限元素模擬分析與暫態響應實驗之結果比較，找出容易引起帶鋸機振動之結構，再利用尺寸之修改找出降低振動之方向。本文由靜態敲擊實驗的結果可知，從多個不同敲擊點進行實驗，其暫態響應行為都在特定幾個頻率會出現，而頻率較高之液壓雙柱為容易造成結構的激振，而再利用有限元素軟體Ansys Workbench進行模擬與實際實驗數據相互比對其正確性。從模態響應分析上三大部份中也同樣顯示出說液壓雙柱之結構是為不穩定的，容易使帶鋸機在切削上能夠穩定且不易造成結構上的共振狀態，在頻率中出現會影響切削之響應，其頻率為較易影響切削時振動之發生要素。以有限元素模擬分析結果可得在三種不同形式之結構修改下，是同長度而改變寬度之矩形H組頻率上結構振動特性為較高，以這三部分之結構模擬分析結果比較中，可以知道最適合之結構型態H型長度而改變寬度之矩形，此結構型態較能有效的降低結構在切削時產生倍頻振動，並且此結構為Y軸向補強結構，因此可以判定說在Y軸部分有可能是造成的結構振動為影響之主因，然而修改尺寸後結構共振之差異不大，但能可以從中得知往後可修改之方向，為國產帶鋸機鋸削穩定性設計提供目標依據。

關鍵字

結構 ； 振動 ； 暫態響應 ； 模態響應

並列摘要

This study is focuses on structural analysis of band saw machine and vibration control, used of finite element analysis and transient response of the experimental results, find out the band saw machine vibration prone structure, reuse, reduce the size of the change to identify the direction of vibration .
This article struck by the static experimental results, the hit points from many different experiments, the transient response behavior occurs in a specific number of frequencies, while the higher frequency of double column is likely to cause the hydraulic structure of excitation.
Then re-use finite element software Ansys Workbench simulation and actual experimental data with each other than its accuracy, Modal response analysis from the three parts also show that in the two-pillar structure of hydraulic pressure is unstable, easily cutting band saw machine is stable and not easily able to create the structure of the resonance states appear in the frequency will affect the cutting of the response, its frequency is easier to influence the occurrence of vibration of cutting elements.
The finite element simulation results can be obtained in three different forms of structural modifications, the same length and width of the rectangle to change the frequency on the H group of the lowest vibration characteristics to simulate the three-part analysis of the structural comparison, and know the most H-type pattern for the length of the structure to change the width of the rectangle, this structure forms a more effective in reducing the vibration of the structure in the cutting, because the Y axis of this structure is reinforced structure, it can determine that some of them might in the Y-axis is caused by the vibration of the main reasons for the impact, however, modify the size of the differences after the resonance is not, but could be back from that direction can be modified for the domestic stability of band sawing machine designed to provide objective basis.

並列關鍵字

structural ； vibration ； transient response ； modal response

參考文獻

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