重量分佈對於車輛動態的影響 - 電動車

By Iris
at 2018-12-29T11:14
at 2018-12-29T11:14
Table of Contents
你找的資料提到polar moment of inertia (PMI)
但實際上那根本就是moment of inertia (MI)
文章搞混把moment of inertia (MI) 誤講成polar moment of inertia (PMI)
既然也都查wiki了,拜託看清楚polar moment of inertia的定義
https://en.wikipedia.org/wiki/Polar_moment_of_inertia1
the polar moment of inertia is a shaft or beam's resistance to
being distorted by torsion, as a function of it's shape.
PMI是指物體(截面積)抵抗torsion的能力,截面積形狀影響到剛性
但你提到最原始的影片只講述動態行為,完全沒有提到車體結構剛性
再來,建立多體動力學模型本來就有考慮到元件擺放位置、質量、慣量等參數
不是單單只考慮重心位置與前後軸承重變重,要懷疑前可以查一下資料
https://i.imgur.com/rwugpq1.jpg
從最開始的系列文,你一直提到的質量分布集中在質心
這就是moment of inertia減小
然後你一直誤講成是polar moment of inertia減小
假設如你所說的PMI縮小,那可是更容易torsion不利車體扭轉剛性
而電動車因電池擺放造成moment of inertia的改變,模擬結果也證明給你看
雖然電動車質量集中在中心,但車子多了100多公斤質量
因此操控性並沒有顯著的提升(yaw rate差異很小)
※ 引述《Scape (缺鈣缺很大)》之銘言:
: → chandler0227: 大概知道了,影片是講對拖車勾點的polar moment of 12/29 00:
51
: → chandler0227: inertia,但這跟電動車yaw根本就不是同一情況啊 12/29 00:
53
: → chandler0227: 你還是把polar moment of inertia跟moment of inert 12/29 09:
05
: → chandler0227: ia搞清楚定義比較好,你列的文章一直提到的PMI實際 12/29 09:
07
: → chandler0227: 上就是MI,PMI是指抗扭矩跟剛性有關 12/29 09:
07
: 奇怪了,這年頭竟然有人自己搞不清楚,結果還先聲奪人的要人去把定義搞清楚?
: PMI ≠ MI,這我上面已經跟你說過了你也不去查還堅持己見
: 最容易查詢的wiki 有關於PMI 的頁面上第一段就說了:
: https://en.wikipedia.org/wiki/Polar_moment_of_inertia
: Note: Polar moment of area should not be confused with moment of inertia,
: which characterizes an object's angular acceleration due to a torque.
: 開宗明義就跟你說不可把PMI 與MI 搞混
: 下面也有例子跟你說hollow cylinder(空心圓柱)的PMI 與MI 怎麼算
: PMI 的單位是m^4,MI 的單位是kg*m^2
: 兩個連單位都不同的物理量會是一樣的東西???
: 你不知道什麼是PMI 就算了,現在連別人跟你說了還聽不進去
: 是太自滿了裝不下其他水了嗎?
--
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