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IV.1.4.1 Loads

One makes the distinction between load cases corresponding to quasi-static accelerations or forces applied on the structure and thermo-elastic loads cases.

First, three load cases corresponding to quasi-static accelerations applied to the entire satellite structure are defined in file “unit_accel.bdf”. These accelerations are defined by Nastran “GRAV” cards and are oriented in directions X, Y and Z. Their Load identifiers are 601001, 601002 and 601003 respectively.

Then loads corresponding to quasi-static acceleration on parts of the structure are created by defining the appropriate force fields. The method used to defined those force fields is explained in the example presented in section IV.2.5.1. Six files contain these force fields:

One also defines temperature fields for thermo-elastic load cases calculations:

The method used to defined these temperature fields is explained in the example presented in section IV.2.5.2.