你如何将发动机扭矩转换马力？

~jack~

你曾经看着发动机的规格在一本杂志上见过这样的东西“这台发动机在4000转扭矩300磅 - 英尺，”想知道这是多大的权力？多少马力，我们谈论的是这里吗？你可以计算出的马力多少磅 - 英尺这款发动机生产使用一个共同的公式：

300磅 - 英尺的扭矩在4000转，使发动机产生[（300×4,000）/ 5,252] 228马力在4000转。但数5,252来自？

为了从磅 - 英尺扭矩马力，你需要去通过一些转换。数5,252结块成一个号码几个不同的转换因素的共同作用的结果。

首先，1马力被定义为每秒550磅 - 英尺（马力厂找到了他们是如何得到这个数字）。扭矩的单位是磅 - 英尺。所以要得到扭矩马力，你需要“每秒”一词。你乘以发动机转速的扭矩。

但发动机转速通常是指在每分钟转速（RPM）。因为我们希望有一个“每秒，”我们需要转换的RPM“每秒的东西。”秒是容易的 - 我们只是60分从分钟到秒。现在我们需要的是一个革命的量纲单位：弧度。弧度实际上是一个弧的长度除以半径的长度比例，这样的长度单位取消了，你留下一个无量纲的措施。

作为测量角度，你能想到的一场革命。一个革命是360度的圆。由于圆的周长是（2×PI x半径），也有在革命2-pi弧度。转换转每分钟，每秒的弧度，乘以RPM（2-pi/60），这等于0.10472弧度每秒。这给我们的“每秒”我们需要计算马力。

让把这在一起。我们需要得到马力，这是550磅 - 英尺每秒，使用扭矩（磅 - 英尺）和发动机转速（RPM）。如果我们除以550磅 - 英尺每秒0.10472弧度（发动机转速），我们得到550/0.10472，相当于5,252。

所以，如果你乘以发动机转速（RPM）的扭矩（磅 - 英尺），除以5,252产品，RPM是转换为“每秒的弧度”，你可以得到由“磅 - 英尺扭矩马力 - ” “磅 - 英尺每秒。”

~jack~

Have you ever looked at the specs of an engine in a magazine and seen something like "this engine makes 300 pound-feet of torque at 4,000 RPM," and wondered how much power that was? How much horsepower are we talking about here? You can calculate how many foot-pounds of horsepower this engine produces using a common equation:
The engine that makes 300 pound-feet of torque at 4,000 RPM produces [(300 x 4,000) / 5,252] 228 horsepower at 4,000 RPM. But where does the number 5,252 come from?
To get from pound-feet of torque to horsepower, you need to go through a few conversions. The number 5,252 is the result of lumping several different conversion factors together into one number.
First, 1 horsepo­wer is defined as 550 foot-pounds per second (read How Horsepower Works to find out how they got that number). The units of torque are pound-feet. So to get from torque to horsepower, you need the "per second" term. You get that by multiplying the torque by the engine speed.
But engine speed is normally referred to in revolutions per minute (RPM). Since we want a "per second," we need to convert RPMs to "something per second." The seconds are easy -- we just divide by 60 to get from minutes to seconds. Now what we need is a dimensionless unit for revolutions: a radian. A radian is actually a ratio of the length of an arc divided by the length of a radius, so the units of length cancel out and you're left with a dimensionless measure.
­You can think of a revolution as a measurement of an angle. One revolution is 360 degrees of a circle. Since the circumference of a circle is (2 x pi x radius), there are 2-pi radians in a revolution. To convert revolutions per minute to radians per second, you multiply RPM by (2-pi/60), which equals 0.10472 radians per second. This gives us the "per second" we need to calculate horsepower.
Let's put this all together. We need to get to horsepower, which is 550 foot-pounds per second, using torque (pound-feet) and engine speed (RPM). If we divide the 550 foot-pounds by the 0.10472 radians per second (engine speed), we get 550/0.10472, which equals 5,252.
So if you multiply torque (in pound-feet) by engine speed (in RPM) and divide the product by 5,252, RPM is converted to "radians per second" and you can get from torque to horsepower -- from "pound-feet" to "foot-pounds per second."

没有路

你用google 翻译？

edwinkan

不明白楼主说什么？！@@

ngangee

回复 1# ~jack~

你的用词很奇怪,什么叫"革命"?

carieddy

耳朵出血了！

ztig010162990

看到傻眼+不明白

Kevku01

回复  ~jack~

你的用词很奇怪,什么叫"革命"?
ngangee 发表于 14-4-2012 09:51 AM

revolution = 革命
典型的Google Translation

這裡應該解釋為公轉,要貼google翻譯文也可以,但是要去更正.電腦畢竟不是人腦

jun23

纯粹是一个数学贴。。。只是说如何把马力换成扭力。。。没有什么意义。。。也没有解释马力和扭力之间的关系和相连。。。diesel和petrol引擎又不一样马力扭力范围区，turbo和NA也有不一样， petrol + eletric motor也不一样。。。。等等。。。

devil050901

lz是google tanslate是吗？

WKS3177

你用google 翻译吗？

enestyee

不明白楼主说什么+傻眼+乱！但我好想明白！

evo54613

越看越乱？

beefunny

谢谢楼主的分享   

yung0214

想明白，但是看了更加不明白哦。。。理解能力差

hup6889

超烂的翻譯

ppop

你能想到的一场革命？？
5,252产品？？？
google 翻出来的?