Steps of Oscillation Analysis

Stages of forced oscillation analysis

1.Creation of “Study”. When creating a study, you must state its type, “Forced oscillations” in the window of command properties. It is possible to create a copy of study type “Frequency analysis” and change the type; in this case, the mesh and border conditions would be transferred.

2.Setting materials. To set materials, it is necessary to click the right button of the mouse at the body from folder “Bodies” (or at the folder per se in order to set the same material for all bodies) and select item “Material”.

3.Imposing border conditions. In the analysis of forced oscillations, as in the static analysis, fixings and loads play the role of border conditions. In this type of analysis, all types of fixings and force loads can be used. Imposing the fixings and force loads is the mandatory condition of the calculation being correct. In total, the limitations imposed on the displacement of the body shall satisfy the following condition.
For the static analysis, the model must have a fixing excluding its freely moving in the space as the solid body. Failure to fulfill this condition would lead to incorrect results of finite element modelling or failure of computation process. Besides, kinematic load “oscillator” may replace partial or complete fixings.

4.Setting frequencies and damping. Performing calculations. Prior to the calculation, the user shall state in the properties of the study the values of frequencies of load actions, for which the analysis of forced oscillations will be performed, as well as the damping value.

5.Obtaining and analysing results. To fine-tune the displayed results, you must click the right mouse at folder “Results” in the tree of the study and select item “Results”. The results of forced oscillation analysis: amplitudes of displacements, vibration accelerations or vibration overloads, and phases of oscillations. For each type of the “Result” the opportunity is provided to view the deformed state of a structure in different phases.

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