Adams Simulation

To run an acoustics analysis after an Adams analysis, the Adams model needs a flexible body active during the simulation. To learn more about flexible bodies in Adams, see the Adams Flex guide and the Adams ViewFlex guide.

The required time step depends, on the one hand, on the Adams model (time step needs to be sufficiently small). On the other it depends on the maximal computed frequency of the acoustic radiation analysis to be run in Actran via the plugin. The Nyquist criterion is used to calculate the maximal allowed time step, with the maximal time step size, , the maximal compute frequency in the Discrete Fourier Transform (DFT) of the time signal.

GSTIFF and HHT are both very commonly used. There is no strict preference. Like always, Adams Solver settings (for example, error tolerance) should be tested to find the proper balance between convergence of important results and simulation elapsed time.

The "Skip Time Step" parameter can be used to reduce the number of Adams analysis time steps the acoustic simulation considers. The acoustic simulation skips the defined number of time steps. This will reduce the number of time steps in the acoustic simulation and speed up the acoustic simulation. The limiting factor is the maximum frequency that should be computed in the acoustic radiation analysis. The maximal frequency content of the acoustic simulation depends on the time step size chosen, the formula is ; with the maximal time step size, , the maximal compute frequency in the Discrete Fourier Transform (DFT) of the time signal.

It is recommended to switch off contact incidents in the Adams Solver results content. This is because these contact incidents will cause Adams Acoustics to assume an excessively small time step for the purposes of mesh and frequency definitions.