Rotary10-RV
Well Known Member
Number of masses not the critical factor
Mike and Dan,
We have been talking about the DMF or perhaps multiple stiffness driveline would be a better discription. I know I'm preaching to the Choir here but the real point here is to move any resonant frequencies out of the "normal" range correct? We can use a stiff model or a flexible model to do that. Perhaps the rubber damping segments might be our stiff model and the spring portion of the DMF our soft model. I can understand Jan's reluctance to publish figures since he is then helping his competitors to no gain. Maybe it is a better idea to recomend that his competitors do tortional vibration tests or ignore them at their peril.
An interesting study was the BD-5 with its drive shaft system.
Google BD-5 and tortional vibration and you will find the commentary. It is a very interesting problem and shows why we cannot just assemble the parts available and hope they will work. Nice that modern computer programs can now help us without breaking the bank.
Bill Jepson
Mike and Dan,
We have been talking about the DMF or perhaps multiple stiffness driveline would be a better discription. I know I'm preaching to the Choir here but the real point here is to move any resonant frequencies out of the "normal" range correct? We can use a stiff model or a flexible model to do that. Perhaps the rubber damping segments might be our stiff model and the spring portion of the DMF our soft model. I can understand Jan's reluctance to publish figures since he is then helping his competitors to no gain. Maybe it is a better idea to recomend that his competitors do tortional vibration tests or ignore them at their peril.
An interesting study was the BD-5 with its drive shaft system.
Google BD-5 and tortional vibration and you will find the commentary. It is a very interesting problem and shows why we cannot just assemble the parts available and hope they will work. Nice that modern computer programs can now help us without breaking the bank.
Bill Jepson