換鍛造框後 起步變快 路感變清晰 - 汽車
By Hedwig
at 2019-06-18T10:30
at 2019-06-18T10:30
Table of Contents
https://i.imgur.com/RAOclD2.jpg
力傳遞路徑
路面 => 輪胎/輪圈 => 主銷 => 簧上質量
https://i.imgur.com/bKGT6TV.jpg
https://i.imgur.com/kSWJF6m.jpg
假設成簡單一點的MCK系統
只要系統中某質量或是剛性(K值)變動,傳遞函數都會改變
https://i.imgur.com/AuD9Xcq.jpg
縱軸是振動量(位移),橫軸是頻率
這張圖解釋了隨著簧下值量降低,振動量(位移)降低,波峰移往高頻
人體舒適性可以看ISO-2631
https://www.artc.org.tw/upfiles/ADUpload/knowledge/tw_knowledge_457410515.pdf
https://i.imgur.com/tuhzlSc.jpg
https://i.imgur.com/md5Q106.jpg
在坐姿情況下,人體對4~10 Hz垂直上下振動較為敏感(因此採Wk加權)
結論,因為換鍛造框讓簧下質量降低
路面傳遞至車身或人體的振動函數,最大值雖然降低但往高頻部分移動(高頻振動增加)
也許剛好頻率挪到人體最敏感的4~10 Hz,造成你不舒服
※ 引述《GOPOL (盡心盡力莫忘初衷)》之銘言:
: 小弟最近換了鍛造框 四輪加起來 輕了大概18公斤
: 尺寸都維持一樣 只有J值變大0.5 ET值縮小5mm
: 換了後非常有感起步變快
: 但是也發現路感變得更清晰..碎震比較多感覺
: 遇到坑洞的感覺 比之前更明顯 (胎壓都跟之前保持一樣)
: 這是為什麼? 不是說輕量化輪框 對懸吊負擔更小
: 怎麼反而比較不舒服? 還是那裏要重新調整?
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