شما باید از دستور *spring استفاده کنید که البته تمامی آپشن های آن در محیط ویژوال در دسترس نیستند. بنابراین باید آنرا در محیط keyword ایجاد نمایید. در مورد کار در این محیط در فصول آخر کتاب توضیح داده شده است.

در اولین خط بعد از تعریف spring شما لازم است درجه آزادی چرخشی مورد نظرتان را وارد کنید و در خطهای بعدی طبق راهنمای زیر مقادیر سختی پیچشی را وارد کنید:

Data lines to define linear spring behavior for SPRING1, SPRING2, or JOINTC elements

First line

1. Degree of freedom with which the springs are associated at their first nodes or, for JOINTC elements, the degree of freedom for which the spring behavior is being defined.
2. For SPRING2 elements give the degree of freedom with which the springs are associated at their second nodes.

If the ORIENTATION parameter is included on the SPRING option when defining spring elements or on the JOINT option when defining joint elements, the degrees of freedom specified here are in the local system defined by the ORIENTATION option referenced.

Second line

1. Real spring stiffness (force per relative displacement).
2. Frequency (in cycles per time). Applicable only for STEADY STATE DYNAMICS, DIRECT; STEADY STATE DYNAMICS, SUBSPACE PROJECTION; and STEADY STATE DYNAMICS and MODAL DYNAMIC analyses that support nondiagonal damping.
3. Temperature.
4. First field variable.
5. Second field variable.
6. Etc., up to five field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five)

1. Sixth field variable.
2. Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the spring stiffness as a function of frequency, temperature, and other predefined field variables.