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The degrees of freedom of a structure system is the number of independent variables required to determine the position of the system in motion. If more than one of these independent variables needs to be known, these systems are multi-degree-of-freedom systems. In three-dimensional dynamic analysis application, multi-degree-of-freedom systems are used and 6 independent variables are taken into account: displacements in the x, y and z axes and rotations around these axes. In reality, all systems are made up of continuous masses. However, when performing dynamic analysis with finite elements, it is assumed that the masses are gathered at the element nodes.
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Also see. : Full and Semi-Rigid Diaphragm
The dynamic behavior of multi-degree-of-freedom systems is expressed by the following set of differential equations. This equation is also called the equation of motion.
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As a result of the modal analysis performed in ideCAD Static, the masses used for the modal analysis, the natural vibration periods calculated for each mode, and the angular frequency values can be examined in the Modal Analysis Report .
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