Computing MPH

[Greg Hermann]

At 10:43 AM 8/27/01, Steve.Flanagan at VerizonWireless.com wrote:
>I was at the track this weekend and pitted next to Victor Cagnazzi (#10 on
>the Pro-Stock Truck circuit).  Look for him in Indy this weekend, Great guy,
>gave us some clutch tuning tips and other.
>
>He is using the RacePac data logger and it has a channel that shows MPH.
>This is not based off the Drive Shaft or other but it uses the G sensor.
>
>I have a data logger that shows G's but does not compute MPH.
>
>How would I go about figuring out MPH relative to G's?
>
>I know how to compute relative to Drive Shaft.  This is not what I am
>asking.
>
>What is the mathematics involved.  And does the Sampling rate of the G
>sensor make a difference or are we just concerned about the average G's and
>the time?

You basically need to integrate G over time to arrive at velocity (MPH).
The quicker the sampling rate, the more accurate the result.

You can do the same thing--integrate V over time to get distance.

Trident missile subs do this (in all six degrees of freedom, and to an
astounding degree of accuracy) in their inertial navigation systems----

Greg
>
>Thanks
>
>Steve F
>
>
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