The flexible of the frame construction is important factor of vehicle vibration. Software FRUND introduce flexible bodies by restrict set of eigenfrequencies and eigenvectors. One set is provide from the finite elements method (FEM) software. FRUND contain the open interface to input one sets from FEM programs. For case of stochastic excitation postprocessor provide algorithms statistical analysis of the results modeling.

Scheme of the autobus ZIL 32501 with flexible frame and cab.

The animation of the flexible displacement of frame and cab from movement over single obstacle, scaled-up 16.

Comparison calculated and experimental power spectral density.

Scheme of the car VAZ 2123 with flexible cab and tailpipe.

FEM cab model, MSC NASTRAN .

Comparison calculated and experimental power spectral density, VAZ 2123.

Flexible displacement tailpipe at “good” cobbly,V=60 km/h, scaled-up 256.

Flexible displacement cab at “good” cobbly,V=60 km/h, scaled-up 512.