Folks,
I haven't completely finalized this stuff, but I think I've got a pretty cool new way to figure out my cars motion ratios very accurately:
SketchUp with the SketchyPhysics extension.
With SketchyPhysics added to it, you can model objects in SketchUp and then connect them with various kinds of joints including hinges and sliders. And while this model isn't dimensionally accurate (because I was just playing around), it should give you the idea:
The shots show a model built in SketchUp with a "frame" to which are attached (via SketchyPhysics joints) a lower A-arm, a bellcrank, and a pushrod between them. The purple bits are normal hinges while the orange component is a "servo" which is controlled via the slider in the small window above the main model window. It is set to swing the A-arm through 6 degrees of movement, and you can see how the dimension lines included change to indicate how the distances between the end of the A-arm and the ground as well as between the bellcrank shock mounting point and the frame mount change as the slider is moved from 0-1 (representing -3 to 3 degrees of A-arm) movement.
Not only can you draw these items, SketchUp and SketchyPhysics are both scriptable so that you could write a script to move the suspension geometry through small increments and get the data out as a file you could further analyse in Excel for instance. But even without going to those lengths, you could pretty quickly determine if you had rising or falling rate geometry.
Further improvements will let me move the outer end of the A-arm in precise increments of tenth's of an inch using the "piston" joint (essentially a linear servo joint)
I haven't completely finalized this stuff, but I think I've got a pretty cool new way to figure out my cars motion ratios very accurately:
SketchUp with the SketchyPhysics extension.
With SketchyPhysics added to it, you can model objects in SketchUp and then connect them with various kinds of joints including hinges and sliders. And while this model isn't dimensionally accurate (because I was just playing around), it should give you the idea:
The shots show a model built in SketchUp with a "frame" to which are attached (via SketchyPhysics joints) a lower A-arm, a bellcrank, and a pushrod between them. The purple bits are normal hinges while the orange component is a "servo" which is controlled via the slider in the small window above the main model window. It is set to swing the A-arm through 6 degrees of movement, and you can see how the dimension lines included change to indicate how the distances between the end of the A-arm and the ground as well as between the bellcrank shock mounting point and the frame mount change as the slider is moved from 0-1 (representing -3 to 3 degrees of A-arm) movement.
Not only can you draw these items, SketchUp and SketchyPhysics are both scriptable so that you could write a script to move the suspension geometry through small increments and get the data out as a file you could further analyse in Excel for instance. But even without going to those lengths, you could pretty quickly determine if you had rising or falling rate geometry.
Further improvements will let me move the outer end of the A-arm in precise increments of tenth's of an inch using the "piston" joint (essentially a linear servo joint)
Sketchup and Sketchyphysics for geometry/motion ratio
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