ABSTRACT
Defining a spring element in command-line mode is of course very quick and simple. Since ACSL is a FORTRAN-based language, and no special operations are needed, we could describe a spring with the statement FORCE=KS*(Xl-X2). The spring stiffness KS could be given a numerical value in a separate statement such as CONSTANT KS = 125.3, or we could initially just have written FORCE= 125.3*(X1-X2). Names such as FORCE, KS, Xl, and X2 could of course be chosen as we wish, but it is always good practice to choose symbols that remind you of the actual physical quantity.
