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weise
Member

Join Date: Aug 2007
Posts: 5

Linear Velocity to angular velocity

10/25/2007 4:06 PM

I am trying to convert braking speed for a dynamometer brake test from km/h to rpm. How do i go about doing this given i have a different radius' for the shaft, the rotor and the tooling fixture attaching the inertia section to the brake

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cnpower
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Engineering Fields - Control Engineering - New Member China - Member - New Member

Join Date: Sep 2006
Location: CHINA
Posts: 2945
Good Answers: 14
#1

Re: Linear Velocity to angular velocity

10/25/2007 8:35 PM

I dont know how you measure your brake force from km/h?

speed of distance from braking to stop your car? if so, you can only divide radius of wheels to work out.

km/h x time/60 = n x 2pix r/1000, where r unit is meter.

n= rpm.
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Anonymous Poster
#2

Re: Linear Velocity to angular velocity

10/26/2007 6:59 AM

How have you arrived at the inertia you're using out of interest? The primary function of the brake is to eat energy not speed.

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weise
Member

Join Date: Aug 2007
Posts: 5
#5
In reply to #2

Re: Linear Velocity to angular velocity

10/29/2007 9:59 AM

the inertia was computed by using the eqn torque*time/(change in speed)
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Anonymous Poster
#3

Re: Linear Velocity to angular velocity

10/26/2007 4:10 PM

Assuming that you used the diameter of the tire to obtain km/hr divide the total distance (Km) by tire diameter (km) x pi, then divide by 60 (minutes) and you will determine the RPM.

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vikas
Guru

Join Date: Aug 2007
Posts: 548
#4

Re: Linear Velocity to angular velocity

10/26/2007 4:51 PM

What are your intentions , you want to convert km/hr to rpm?? please be specific and details of your questions
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