![]() This behavior typically occurs because of instrumentation errors or a sampling frequency that is not sufficient to capture the actual acceleration history. When you use an amplitude definition to define an acceleration history in the time domain (a seismic record of an earthquake, for example), the integration of the acceleration record through time may result in a relatively large displacement at the end of the event. If desired, display the Baseline Correction tabbed page. For detailed information on how to enter data, see Entering tabular data. This parameter is applicable only when time derivatives are needed (for displacement or velocity boundary conditions in a direct integration dynamic analysis) and is ignored for all other uses of this option.ĭisplay the Amplitude Data tabbed page, and enter the tabular data. ![]() ![]() The Smoothing parameter is the fraction of the time interval before and after each time point during which the piecewise linear time variation is replaced by a smooth quadratic time variation. A value of 0.05 is suggested for amplitude definitions that contain large time intervals to avoid severe deviation from the specified definition. Indicate how you want to define Smoothing:Ĭhoose Use solver default to accept a default value of 0.25 in Abaqus/Standard and 0.0 in Abaqus/Explicit.Ĭhoose Specify to enter a value for the smoothing parameter in the adjacent field. Select Total time for total time accumulated over all non-perturbation analysis steps. Select Step time for time that is measured from the beginning of each step. Display the Edit Amplitude dialog box as described in Selecting an amplitude type to define.Ĭlick the arrow to the right of the Time span field, and specify how you want to define the amplitude as a function of time: ![]()
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