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Error Fourier Transform in NX Nastran


In our tire noise model using NX Nastran (non liner analysis) and Siemens Visual Lab (VL). Briefly explain, our model is the simple tire to study the noise with different tread pattern. The step are separated into 3 steps:


1. Inflation

2. Compression tire to drum

3. Rolling


Then, transfer result to VL to run the noise analysis.


We focus to the vibration up to 1500 Hz. Our problem is that we cannot run noise analysis in VL because the step time from NX is unstable as shown below. We tried to solve this problems but unfortunately now we cannot solve it. The time steps are still unstable when the tire starts rolling. Please recommend us how to solve this problem.