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Choose Tabular to define the amplitude curve as a table of values at convenient points on the time scale. Abaqus interpolates linearly between these values, as needed. For more information, see Defining tabular data.
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Choose Equally spaced to give a list of amplitude values at fixed time intervals beginning at a specified value of time. Abaqus interpolates linearly between each time interval. For more information, see Defining equally spaced data.
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Choose Periodic to define the amplitude, a, as a Fourier series:
where , N, , , , and , , are user-defined constants. For more information, see Defining periodic data.
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Choose Modulated to define the amplitude, a, as
where , A, , , and are user-defined constants. For more information, see Defining modulated data.
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Choose Decay to define the amplitude, a, as
where , A, , and are user-defined constants. For more information, see Defining exponential decay.
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Choose Solution dependent to calculate amplitude values based on a solution-dependent variable. For more information, see Defining a solution-dependent amplitude for superplastic forming analysis.
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Choose Smooth step to define the amplitude, a, between two consecutive data points and as
where . For more information, see Defining smooth step data.
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Choose Actuator to import the current value of an actuator amplitude at any given time from a co-simulation with a logical modeling program. For more information, see Defining an actuator amplitude via co-simulation. No additional data is required to define the amplitude curve.
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Choose Spectrum to define a spectrum to be used in a response spectrum analysis. For more information, see Specifying a spectrum.
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Choose User to define the amplitude curve in user subroutine UAMP (Abaqus/Standard) or VUAMP (Abaqus/Explicit). For more information, see Defining an amplitude via a user subroutine.
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Choose PSD definition to define a frequency function that defines the frequency dependence of the random loading in a random response analysis step. This amplitude curve represents the power spectral density function for the random noise source. The PSD amplitude can be referenced in the correlation definition of a base motion boundary condition in a random response step. For more information, see Defining the frequency functions.