2dof spring-mass free vibrations

huangyhg

2dof spring-mass free vibrations
hi to all
i am looking for a simple program that makes linear dynamic analysis of spring-mass systems with 2dof or more, under free vibrations
any suggestion?
most texts on structural dynamics have developed the differential equation for such a model and condiditions.  thus i recommend that you grab a text on the subject and with a little work in mathcad, matlab, excel, etc you can use linear piece-wise interpolation integration to determine the velocity and displacement responses.
some texts that are useful are
structural dynamics by clough and penzien
structural dynamics by craig
dynamics of structures by chopra
regards,
qshake
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