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Dyno 1.0

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Author: Antotabo

Group: Default

Filesize: 15.6 kB

Date added: 2010-01-05

Rating: 5.6

Downloads: 1279

Views: 1754

Comments: 4

Ratings: 2

Times favored: 0

Made with: Algodoo demo

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Works on algodoo.

This is a basic mass acceleration dyno which displays both torque curve and power curve of any engine in real time.

I've mounted my old bounce engine on the dyno , as an example (press S to start the engine). But you can put your magnet, bounce or spring engine creations!

Leave a comment here if you have any problem.
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Question: How do you measure torque?
The torque of an engine at a particular RPM can be measured by two ways:
-Induce friction on the shaft to maintain stable RPM, measure the torque applied on the brake system at this particular time (spring dynamometer giving a force multiplied by the distance between axis and the measurement point: you have your torque) , repeat this at each station (let say at each 250 rpm).
-Or the acceleration method (The method I use): accelerate a massive cylinder. The Torque is directly proportional to acceleration. (Force=mass*Acc) This formula can't be applied directly on rotating object because the mass become a gyration momentum (ex: For the same mass, acceleration can be less if the mass is far from the axis). So you have to use a fomula like this (Torque= Acc*J*M) I haven't use any particular formula to give me a special torque measure like N*M or LB/Pi because I get confuse with the 2 Dimensions world of algodoo, and J*M is constant.
There is a couple of extra variables like:
-anvel2 to store old angvel and then calculate angacc1.
-angacc1
-angacc2 and 3 store old acc to make an average to give a more stable graphic (The engine produce a really unstable output)
Last edited at 2010/01/14 00:05:08 by Antotabo
The power tracer broke off and drew a flower.
This is very helpful, thanks a bunch!