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邱煒程 | Khoo Wee Chern
用Visual Basic模擬引擎動態
用Visual Basic模擬引擎動態
用Visual Basic模擬引擎動態
By
邱煒程 | Khoo Wee Chern
・
Taipei, Taiwan
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這是在系上一堂名為【機器動力學】的課堂作業,利用力量分析來撰寫應用程式的雛形,模擬改變引擎的質量和轉動慣量後,對引擎運轉的影響,能作為設計或調校引擎的參考。 狀態一:設定活塞連桿的三個質量為m2=3, m3=2, m4=1,轉動慣量為I2=0.08, I3=0.02, I4=0.05。按Start啟動全油門,能看見轉速很快的上升,但轉動慣量太小,造成引擎轉速不穩定,連帶車輪轉速也會“一快一慢”的前進,車子難以駕馭。 狀態一影片連結:https://drive.google.com/file/d/1E079tMVAn8JAGDEIliBUFoI7hQzfOgkM/view?usp=sharing 狀態二:加大質量和轉動慣量,設定m2=9, m3=8, m4=7,轉動慣量為I2=6, I3=5, I4=4。按Start啟動全油門,轉速緩慢上升,但引擎轉速相對穩定,指針的抖動變小很多。車輪轉速會穩定許多,但車子的加速性相對變差。 狀態二影片連結:https://drive.google.com/file/d/1dBp2OQtFInGUQ1FdFt3tQui47i15Siwu/view?usp=sharing 結論: 透過設定質量和轉動慣量參數來模擬引擎的動態,可見活塞連桿曲軸和飛輪的質量和轉動慣量會影響引擎的運轉。原則上,車廠會盡量減少活塞連桿組的質量來達到輕量化(加快轉速的上升),在曲軸端增加飛輪的配重來提高轉動慣量,增加轉速的穩定性,還得設定各汽缸的點火時間來平衡活塞運動的衝擊。不過此程式編寫得不夠精準,執行結果的誤差值較大。 文章連結:https://drive.google.com/file/d/1knDNKPM_34uwjop9mgOAGerALs6Ed-Yx/view?usp=sharing
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邱煒程 | Khoo Wee Chern
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Published: Mar 5th 2019
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