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Mert1 thanks for that. Did you use BW or CP option.

What would you expect if you use manual mesh.What parametres should be chosen to get optimistic results on ACMODL

In sol 106 ,make sure you dont have any rbe2 or bar elements as they are linear elements. The other thing to try out is to make more than one load cases and increase the number of increments on NLPARM card until you see any convergence. Note that convergence level ,and add another loadcase and...

Has anybody got any current industry experience of coupled acoustic modelling. I am interested in modal frequency response analysis. What sort of mesh density can give optimistic results on bothe structural and cavity. thanks

The latches are very non linear and difficult to model. The tailgate modes are senstive to latch stiffnesses and these modes flare the torsional body modes.

Hi, I am looking at the modes of the automotive closures in installed conditions using FE model. The latch stiffness is critical. Has anybody got any stiffness numbers(spring rates) for a fore aft,vertical and lateral stiffness taht can be used in the analysis. Has anybody got any idea of...

Thanks for the comments Assuming I use sol 111 approach and use free free condition. I will need bailout card if I use unit force on RLOAD card. Which I am not sure if its correct. Can I use SPCD card. If I can then I would not be able to apply the unit force.

When you run it in frequency domain, you will have an option to run it as modal frequency NASTRAN sol111 or direct frequency sol108.Which one?? The other question that arise is with boundary condition, as whether to run as free free state or constrained state. To reduce the CPU time, is it...

Should this be calculated in free free condition or constrained. If constrained then where to constrain. Or it does not matter where to constrain.

I have already published this question in other forum. What is the best method to calculate point dynamic stiffness (mm/sec/Newton) in nastran for automotive application.

Can any body advise on the best practice for calculating point mobility using Nastran.

Can anybody give me an idea on how to calculate point mobility using Nastran/FEA for automotive applications.

yes hydro mounts

4 cylinders, 3 pt mt system

It is a transverse engine and it idles around 750 rpm approx.

Does that mean the lowest mode of P/T should avoid 4-8 hz human sensitive area. Then you get very small 8-12ish hz band to play with all modes. When I said bounce and pitch, which of these two are most sensitive to suspension modes . Surely if the dominant bounce is most likely to get excited...

I am looking at the Engine/transmission rigid modes of the transversly mounted engine of passenger vehicle from the point of view of locating there positions. In the mode development exercise, what mode should be priortised to be the lowest mode ie bounce or pitch and what should be the...

What is the physical meaning of point mobility and how do we set the targets at engine and suspension attachment points for c class BIW. Has anybody got any figures?? Is it important to calculate the noise transfer funtion at the concept phase of BIW and if it is how do we calculate/predict...

I can understand the lateral compliance but not the camber compliance. What exactly you mean by camber complince in ride and roll. Due to large geometrical non linearity in the twist or bending of the centre beam do you think the complince should be taken at the maximum wheel travel, as...

Thanks Greg for the valuable info. What is the difference between roll steer and toe steer(in deg/mm) and under what condition I should measure this. Do you think longitudinal and lateral compliance is also important for this type of suspension.What is the effect of these characteristics over...