Ians... with all due respect, I have to disagree with your torsional rigidity test... for two reasons..
pure chasis torsion test, with rear shock mounts and possibly rear suspension mounts being fixed points, and front shock or rocker bearing (depending
on the type of suspension) being input nodes is more relevant to the chasis rigidity case, as pure chasis rigidity is an indicator, for me, to as how
succesfully the chasis will transmit suspension loads to opposite wheels.
secondly, complete chasis test, as you suggest, is relevant of course, because we are also interested in how our suspension geometry will change with
respect to wheel loadings, but in such a case, your testing model is not fully correct as road loads can not be applied at spindles directly, because
in real life they are applied at tyre contact patch, and then you have a completely new set of forces on your spindle.. (basically you do not have a
single upwards or rearward force, but a moment on a spindle so your suspension components are loaded differently...
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