User`s guide

MADYMO Coupling Manual Release 7.5

7 Coupling with Radioss

7.1 Introduction

This section gives speciﬁc information related to the coupling with Radioss.

Please note that the details of the input deck for Radioss have been based on Radioss 4.7.4

and may be subject to modiﬁcations. Always refer to the latest Radioss documentation for the

correct syntax.

7.2 Simulation Control

• For general simulation control, please refer to Sec.

1.1.3.

• For Direct coupling, the simulation end time point deﬁned in the MADYMO input ﬁle is

considered only. The end time point deﬁned in the Radioss ﬁle is ignored.

For MPP coupling, the simulation ends when either the simulation end time point spec-

iﬁed in the MADYMO input ﬁle or the Radioss input ﬁle is reached, whichever is lower.

• The /MODIF Radioss’s option is not suppported while using coupling.

• To enable direct coupling, the option /MADYMO/ON in the Radioss ENGINE input ﬁle

is necessary.

To enable MPP coupling, the option /MADYMO/MPP in the Radioss ENGINE input

ﬁle is necessary.

/MADYMO/ON

Lunit Tunit Munit

Lunit Length unit conversion factor, must be 1 meter in Radioss model units

Tunit Time unit conversion factor, must be 1 s in Radioss model units

Munit Mass unit conversion factor, must be 1 Kg in Radioss model units

/MADYMO/ON

1 1000 1

Here the 1000 speciﬁes that Radioss should divide their time values with 1000 before

sending them to MADYMO (and the inverse for all time numbers received from MADY-

MO), effectively stating that the Radioss input ﬁle is in ms. The lenght and force numbers

are unchanged.