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Adams acceleration magnitude

Josef K.
Hello,
 
I am simulating an experimental gearbox in Adams. When complaring the gearbox vibrations (accelerations) between the experimental measurements and the Adams requests, there is a huge difference in magnitudes. The units in Adams are in mm, but I always make sure to turn them into m so as to compare them to the experimental measurements. I am using the default Adams solver settings, except from the fact that I use multithreading as PREFERENCES/, NTHREADS = 4.
 
I have also read in the documentation that the I3 integrator (which is the default|) may not calculate the accelerations properly, but this great a difference in magnitude shouldn't be related to that.
 
Are there any other things I should look into that might help mitigate my problem?
 
P.S.
 
I am using flexible bodies (the gearbox included) in order to allow for some flexibility in the model.
 
Thanks,
 
Josef
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    Default settings for the integrator, specifically if you are looking at accelerations are not sufficient.
    Before doing anything else, you need to iterate to good settings of error and HMAX. First keep decreasing error until displacements converge, then decrease hmax until accelerations converge. You'll be surprised how big difference this make.
    Even better is to start with SI2 if you're interested in accelerations. You still need to go through the iterations to make sure the solution accuracy has converged, but it should be easier with SI2.
     
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  • 0
    Default settings for the integrator, specifically if you are looking at accelerations are not sufficient.
    Before doing anything else, you need to iterate to good settings of error and HMAX. First keep decreasing error until displacements converge, then decrease hmax until accelerations converge. You'll be surprised how big difference this make.
    Even better is to start with SI2 if you're interested in accelerations. You still need to go through the iterations to make sure the solution accuracy has converged, but it should be easier with SI2.
     
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