CAE Process optimization

To meet NVH design requirements, comfort relevant response results must be calculated for many simulated load cases including engine idle, wheel out-of-balance, road excitation etc. Typically, the following response functions must be calculated for all load cases:

• Vibration transfer functions for seats and their connection points, foot-position panel vibrations, steering wheel vibrations, mirror and headlight vibrations
• Noise transfer functions between mechanical excitation points and driver and passenger ear sound pressures responses
• Driving point response mobility for driveline/suspension connection points and sub-frame attachment points

In practice, the number of individual NVH load cases to be considered can easily exceed 200 loadcases. Post-processing the frequency response functions is in itself a major operation. Once critical responses have been identified, it is necessary to re-repeat the analysis to obtain other information such as operational shapes and panel participation factors. CDH/OPTRAN is specifically designed for NVH analysis efficiency.

CDH/OPTRAN enables users to submit analysis jobs in batch mode after defining load cases, target responses and post-processing requirements. Uncritical responses below their target limits are automatically omitted in the output of plotted response results.