彈力位能 - 汽車
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By Faithe
at 2020-06-12T23:09
at 2020-06-12T23:09
Table of Contents
上次計算錯誤
重新計算
福斯Golf,4T引擎,規格77000w/4000rpm,汽門揚程0.008m,
汽門彈簧的k值=3980kg/m
彈力位能=0.5*k*x^2
每個汽缸是四汽門 不是兩汽門 曲軸轉兩圈 四汽門各開一次
四汽缸下 曲軸轉一圈 十六個汽門總共開八次
汽門關閉下 汽門彈簧彈力應該不是零
汽門揚程0.008m 汽門彈簧壓縮量從0.001m到0.009m
所以汽門彈簧耗損的功率是0.5*3980*9.8*[0.009^2-0.001^2]*(4000/60)=832.08
這樣計算對嗎?
耗損有那麼少?
或是k值錯誤?揚程數值錯誤?
832.08w約是77000w的1%
比想像中低太多了
因為看過有人聲稱4T引擎的汽門結構耗損5%的能量
http://www.chinatruck.org/topic2014/opoc/
https://kknews.cc/science/ypgr84g.html
https://www.eng-tips.com/viewthread.cfm?qid=236426
http://www.formula1-dictionary.net/camshaft_VVT.html
甚至25%的能量
假設引擎熱效率35%,汽門結構耗損5%
汽門結構耗損能量應為引擎輸出功率的1/7,也就是11000w
如果汽門彈簧耗損的功率只有引擎輸出功率的1%
那ducati的desmo又重又複雜又省不了多少汽門彈簧的耗損
desmo不就沒有優點?
本來還希望ducati能做機車和汽車
如果沒有優點,不做也無所謂了
--
重新計算
福斯Golf,4T引擎,規格77000w/4000rpm,汽門揚程0.008m,
汽門彈簧的k值=3980kg/m
彈力位能=0.5*k*x^2
每個汽缸是四汽門 不是兩汽門 曲軸轉兩圈 四汽門各開一次
四汽缸下 曲軸轉一圈 十六個汽門總共開八次
汽門關閉下 汽門彈簧彈力應該不是零
汽門揚程0.008m 汽門彈簧壓縮量從0.001m到0.009m
所以汽門彈簧耗損的功率是0.5*3980*9.8*[0.009^2-0.001^2]*(4000/60)=832.08
這樣計算對嗎?
耗損有那麼少?
或是k值錯誤?揚程數值錯誤?
832.08w約是77000w的1%
比想像中低太多了
因為看過有人聲稱4T引擎的汽門結構耗損5%的能量
http://www.chinatruck.org/topic2014/opoc/
https://kknews.cc/science/ypgr84g.html
https://www.eng-tips.com/viewthread.cfm?qid=236426
http://www.formula1-dictionary.net/camshaft_VVT.html
甚至25%的能量
假設引擎熱效率35%,汽門結構耗損5%
汽門結構耗損能量應為引擎輸出功率的1/7,也就是11000w
如果汽門彈簧耗損的功率只有引擎輸出功率的1%
那ducati的desmo又重又複雜又省不了多少汽門彈簧的耗損
desmo不就沒有優點?
本來還希望ducati能做機車和汽車
如果沒有優點,不做也無所謂了
--
Tags:
汽車
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