Torsional stiffness.
Torsional stiffness.
(OP)
Question concern a race car construction. The chassis that is a tube frame could be looked at as built in 4 sections.
Front suspension, engine, driver, and rear sections. Each having their own triangulation. Totally the chassis show a 30000Nm/dgr reading over the suspenion pushrod rocker location points. Each section show different readings and some areas like in between the rocker and A-arm mountings at the same axle is tremendously stiff.
The question...what effect will this have on the behaviour of the car? Would the car react to anything but the total stiffness over the measuring points? I am not discussing cracking or impact effects etc.
The reason I ask is that I heard opinions about the matter.
Regards
Goran Malmberg
Front suspension, engine, driver, and rear sections. Each having their own triangulation. Totally the chassis show a 30000Nm/dgr reading over the suspenion pushrod rocker location points. Each section show different readings and some areas like in between the rocker and A-arm mountings at the same axle is tremendously stiff.
The question...what effect will this have on the behaviour of the car? Would the car react to anything but the total stiffness over the measuring points? I am not discussing cracking or impact effects etc.
The reason I ask is that I heard opinions about the matter.
Regards
Goran Malmberg





RE: Torsional stiffness.
For handling purposes we are probably interested in the frequency range 0-10 Hz.
The distribution of stifnnesses, and masses, and spring-mounted masses, in the vehicle will alter the shape of the impedance graph, but may not have much effect below 10 Hz.
Cheers
Greg Locock
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RE: Torsional stiffness.
Goran