目前分類:純哈拉! (113)
- Dec 14 Fri 2007 20:23
輕量化飛輪-旋轉動力學2
- Dec 14 Fri 2007 20:16
輕量化飛輪-旋轉動力學
When the flywheel of a car is lightened it can have a great effect on acceleration - much more than just the weight saving as a proportion of the total vehicle weight would account for. This is because rotating components store rotational energy as well as having to be accelerated in a linear direction along with the rest of the car's mass. The faster a component rotates, the greater the amount of rotational kinetic energy that ends up being stored in it. The engine turns potential energy from fuel into kinetic energy of motion when it accelerates a vehicle. Any energy that ends up being stored in rotating components is not available to accelerate the car in a linear direction - so reducing the mass (or more properly the "moment of inertia") of these components leaves more of the engine's output to accelerate the car. It can be useful to know how much weight we would need to remove from the chassis to equate to removing a given amount of weight from the flywheel (or any other rotating component). There is more than one way of solving this equation - we can work out the torque and forces acting on the various components and hence calculate the accelerations involved - also we can solve it by considering the kinetic energy of the system. The latter approach is simpler to explain so this is the one shown below. Copyright David Baker and Puma Race Engines
Let's imagine we take two identical cars - to car A we add 1 Kg of mass to the circumference of the flywheel at radius "r" from the centre. To car B we add exactly the right amount of mass to the chassis so that both cars continue to accelerate at the same rate. If we accelerate both cars for the same amount of time they will end up at the same speed and will have absorbed the same amount of kinetic energy from the engine. In other words, the additional 1 Kg in the flywheel of car A will have stored the same amount of kinetic energy as the additional M Kg of mass in the chassis of car B. To solve the problem of the size of M we need to use the following definitions:
V - the speed of either car after the period of acceleration
R - the tyre radius
G - the total gearing (i.e. the number of engine revolutions for each tyre revolution)
- Dec 11 Tue 2007 12:57
海綿寶寶貼紙
- Dec 09 Sun 2007 17:50
BBC TOP GEAR POWER LAP
2 Pagani Zonda F 1.18.4
3 Maserati MC12 1.18.9
4 Ferrari Enzo 1.19.0
5 Ariel Atom 1.19.5
- Dec 05 Wed 2007 19:43
AUDI TT3.2
- Nov 16 Fri 2007 18:43
莫名其妙
台灣真是個好地方,反正你到哪裡最高速限就是110Km或120Km,如果法規到處限制速度,老是搞偷拍
,老是裝設照相機,為什麼不要出廠時就設定極速110Km或120Km
不然又要添購各式機器拍超速!又要浪費資源人力,多麼不划算
- Nov 15 Thu 2007 21:28
新鮮的蔬菜‧‧‧
- Nov 15 Thu 2007 21:21
十分大頭
忘了把你們攝影起來寄去公司‧‧‧嘿嘿嘿‧‧‧
- Nov 13 Tue 2007 15:42
宏碁電腦,不斷創新 因為用心?
您好,我的桌上型電腦型號ACER POWER F6上頭沒這選項,由於"購買電腦一個月"後即發生CMOS沒電導致時間不對與防毒軟體顯示過期最後2007/10/20無法開機,期間因公務繁忙一直無法送修,最近終於2007/10/22於台中文心服務中心送修(表單編號02755717朱顯文),我並沒要求防毒軟體還原,只求電腦別再出這種荒唐的問題(CMOS電池沒電)但是,不幸的,3天後送修回來,開機正常了,但是USB滑鼠每開一次機就要重新挿一次,2007/11/12又開始無法正常開機!畫面顯示CMOS電池沒電!如果,宏碁的服務只是如此簡單潦草,我也不會再回宏碁這家公司買東西了!打去080小姐也好像只是聽聽我的敘述,口氣還很不高興,唉...不斷創新因為用心?不斷創新毛病,因為用心亂搞?當初花5萬買主機只圖個保固,想不到跑錯地方,越修越離譜,自己組的還比他好!
- Nov 10 Sat 2007 10:18
我好會喝
- Nov 07 Wed 2007 22:04
海綿寶寶
- Nov 01 Thu 2007 13:08
全人類科技又邁向另一個高峰...史上加速最強汽車__0-100km 只要0.28秒
http://new.carnews.com.tw/Gtest20060802.asp
由一手車訊提供資料
車型名稱 Tiida 1.8 5D Focus 1.8 5D
引擎型式 L4 DOHC 16V L4 DOHC 16V
- Oct 31 Wed 2007 18:08
我的鈦金屬中尾段
- Oct 30 Tue 2007 17:15
分享回文...真KUSO
看完樓主的帖子,我的心情竟是久久不能平靜。正如老子所云:大音希聲,大象無形。我現在終於明白我缺乏的是什麼了,正是樓主那種對真理的執著追求和樓主那種對理想的艱苦實踐所產生的厚重感。面對樓主的帖子,我震驚得幾乎不能動彈了,樓主那種裂紙欲出的大手筆,竟使我忍不住一次次地翻開樓主的帖子,每看一次,讚賞之情就激長數分,我總在想,是否有神靈活在它靈秀的外表下,以至能使人三月不知肉味,使人有餘音繞樑、三日不 絕的感受。樓主,你寫得實在是太好了。我惟一能做的,就只有把這個帖子頂上去這件事了。
樓主的帖子實在是寫得太好了。文筆流暢,修辭得體,深得魏晉諸朝遺風,更將唐風宋骨發揚得入木三分,能在有生之年看見樓主的這個帖子。實在是我三生之幸啊。看完樓主的這個帖子之後,我竟產生出一種無以名之的悲痛感——啊,這麼好的帖子,如果將來我再也看不到了,那我該怎麼辦?那我該怎麼辦?直到我毫不猶豫地把樓主的這個帖子收藏了,我內心的那種激動才逐漸平靜下來。可是我立刻想到,這麼好的帖子,倘若別人看不到,那麼不是浪費樓主的心血嗎?經過痛苦的思想鬥爭,我終於下定決心,犧牲小我,奉獻大我。我要拿出這帖子奉獻給世人賞閱,我要把這個帖子一直往上頂,往上頂!頂到所有人都看到為止!
在遇到你之前,我對人世間是否有真正的聖人是懷疑的;而現在,我終於相信了!我曾經忘情於兩漢的歌賦,我曾經驚訝於李杜的詩才,我曾經流連於宋元的詞曲。但現在,我才知道我有多麼淺薄!
樓主,你的高尚情操太讓人感動了。在現在這樣一個物慾橫流的金錢社會裡,竟然還能見到樓主這樣的性情中人,無疑是我這輩子最大的幸運。讓我深深感受到了人性的偉大。樓主 的帖子,就好比黑暗中刺裂夜空的閃電,又好比撕開烏雲的陽光,一瞬間就讓我如飲甘露,讓我明白了永恆的真理在這個世界上是真實存在著的。只有樓主這樣具備廣闊胸懷和完整知識體系的人,才能作為這真理的惟一引言者。看了樓主的帖子,我陷入了嚴肅的思考中。我認為,如果不把樓主的帖子頂上去,就是對真理的一種背叛,就是對謬論的極大妥協。因此,我決定義無返顧地頂了!
- Oct 28 Sun 2007 13:03
我盡力了‧‧‧
- Oct 09 Tue 2007 18:45
F1 富士站
今年目前為止最好看滴咧‧‧‧
- Oct 09 Tue 2007 14:34
R32銘牌加工(FROM JAPAN)
還不錯啦...雖然我不會...
- Sep 24 Mon 2007 11:48
台中太陽電台James所主持的音樂哈瓦那節目日誌
- Sep 23 Sun 2007 19:58
影片欣賞
- Sep 23 Sun 2007 19:22
以GOLF R32情報為主的日本網站