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?
--
All Comments
By Todd Johnson
at 2018-12-30T21:40
at 2018-12-30T21:40
By Suhail Hany
at 2019-01-04T02:36
at 2019-01-04T02:36
By Elma
at 2019-01-07T05:37
at 2019-01-07T05:37
By Susan
at 2019-01-10T14:58
at 2019-01-10T14:58
By Sierra Rose
at 2019-01-14T18:25
at 2019-01-14T18:25
By Regina
at 2019-01-16T15:43
at 2019-01-16T15:43
By Jacob
at 2019-01-21T13:07
at 2019-01-21T13:07
By Cara
at 2019-01-22T06:42
at 2019-01-22T06:42
By Annie
at 2019-01-23T04:13
at 2019-01-23T04:13
By Gilbert
at 2019-01-26T10:38
at 2019-01-26T10:38
By Selena
at 2019-01-27T04:03
at 2019-01-27T04:03
By Dinah
at 2019-01-30T11:35
at 2019-01-30T11:35
By Gilbert
at 2019-02-04T00:13
at 2019-02-04T00:13
By Catherine
at 2019-02-04T09:04
at 2019-02-04T09:04
By Ina
at 2019-02-05T20:28
at 2019-02-05T20:28
By Una
at 2019-02-08T04:37
at 2019-02-08T04:37
By Joseph
at 2019-02-08T07:47
at 2019-02-08T07:47
By Caitlin
at 2019-02-09T16:31
at 2019-02-09T16:31
By Sarah
at 2019-02-11T10:29
at 2019-02-11T10:29
By George
at 2019-02-14T19:57
at 2019-02-14T19:57
By Necoo
at 2019-02-14T21:49
at 2019-02-14T21:49
By Rae
at 2019-02-15T09:52
at 2019-02-15T09:52
By Jacky
at 2019-02-18T16:20
at 2019-02-18T16:20
By David
at 2019-02-20T15:40
at 2019-02-20T15:40
By Jacky
at 2019-02-20T17:51
at 2019-02-20T17:51
By Kyle
at 2019-02-22T22:55
at 2019-02-22T22:55
By Zanna
at 2019-02-25T03:52
at 2019-02-25T03:52
By Megan
at 2019-02-28T21:08
at 2019-02-28T21:08
By Puput
at 2019-03-03T13:04
at 2019-03-03T13:04
By Leila
at 2019-03-05T21:21
at 2019-03-05T21:21
By Hamiltion
at 2019-03-10T08:30
at 2019-03-10T08:30
By Andy
at 2019-03-11T04:44
at 2019-03-11T04:44
By Jack
at 2019-03-15T12:57
at 2019-03-15T12:57
By Puput
at 2019-03-18T11:59
at 2019-03-18T11:59
By Edward Lewis
at 2019-03-22T05:59
at 2019-03-22T05:59
By Jack
at 2019-03-23T22:30
at 2019-03-23T22:30
By Poppy
at 2019-03-28T04:09
at 2019-03-28T04:09
By Olga
at 2019-04-01T02:57
at 2019-04-01T02:57
By George
at 2019-04-04T15:18
at 2019-04-04T15:18
By Madame
at 2019-04-07T07:41
at 2019-04-07T07:41
By Dinah
at 2019-04-11T05:21
at 2019-04-11T05:21
By Hamiltion
at 2019-04-14T21:12
at 2019-04-14T21:12
By Thomas
at 2019-04-19T08:30
at 2019-04-19T08:30
By Thomas
at 2019-04-23T11:20
at 2019-04-23T11:20
By Enid
at 2019-04-27T17:03
at 2019-04-27T17:03
By Robert
at 2019-04-27T22:48
at 2019-04-27T22:48
By Jake
at 2019-04-29T15:29
at 2019-04-29T15:29
By Gilbert
at 2019-05-02T17:53
at 2019-05-02T17:53
By Dinah
at 2019-05-07T10:38
at 2019-05-07T10:38
By Lily
at 2019-05-11T20:12
at 2019-05-11T20:12
By Xanthe
at 2019-05-16T07:46
at 2019-05-16T07:46
By Rae
at 2019-05-17T08:28
at 2019-05-17T08:28
By Franklin
at 2019-05-21T02:42
at 2019-05-21T02:42
By Linda
at 2019-05-24T12:24
at 2019-05-24T12:24
By Kyle
at 2019-05-24T20:17
at 2019-05-24T20:17
By Jacob
at 2019-05-25T03:20
at 2019-05-25T03:20
By Catherine
at 2019-05-25T21:54
at 2019-05-25T21:54
By Irma
at 2019-05-30T12:58
at 2019-05-30T12:58
By Gary
at 2019-06-02T09:16
at 2019-06-02T09:16
By Kristin
at 2019-06-05T09:04
at 2019-06-05T09:04
By Bennie
at 2019-06-09T20:32
at 2019-06-09T20:32
By Regina
at 2019-06-12T17:37
at 2019-06-12T17:37
By Elvira
at 2019-06-16T14:03
at 2019-06-16T14:03
By Skylar Davis
at 2019-06-19T13:58
at 2019-06-19T13:58
By Mary
at 2019-06-22T18:46
at 2019-06-22T18:46
By George
at 2019-06-23T06:02
at 2019-06-23T06:02
By Kumar
at 2019-06-24T06:05
at 2019-06-24T06:05
By Michael
at 2019-06-25T23:16
at 2019-06-25T23:16
By Liam
at 2019-06-29T08:19
at 2019-06-29T08:19
By George
at 2019-06-30T11:45
at 2019-06-30T11:45
By Joe
at 2019-06-30T15:04
at 2019-06-30T15:04
By Kumar
at 2019-07-01T18:45
at 2019-07-01T18:45
By Queena
at 2019-07-05T00:18
at 2019-07-05T00:18
By Daph Bay
at 2019-07-06T13:05
at 2019-07-06T13:05
By Yuri
at 2019-07-07T14:55
at 2019-07-07T14:55
By Daph Bay
at 2019-07-11T19:00
at 2019-07-11T19:00
By Agatha
at 2019-07-16T05:50
at 2019-07-16T05:50
Related Posts
重量分佈對於車輛動態的影響
By Kama
at 2018-12-29T10:15
at 2018-12-29T10:15
賓士超跑與小車對決 GT R竟慘敗
By Dorothy
at 2018-12-29T08:41
at 2018-12-29T08:41
正L電動車
By Elizabeth
at 2018-12-28T22:27
at 2018-12-28T22:27
重量分佈對於車輛動態的影響
By Callum
at 2018-12-28T19:48
at 2018-12-28T19:48
重量分佈對於車輛動態的影響
By Ula
at 2018-12-28T12:45
at 2018-12-28T12:45