Time Curve - Harmonic Loading
You can define a harmonic loading as a combination of sine and cosine wave forms with the option of an exponential rise or decay.

where:
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As = Sine curve amplitude
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ws = Sine curve frequency
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fs = Sine curve phase
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Ac = Cosine curve amplitude
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wc = Cosine curve frequency
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fc = Cosine curve phase
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c = Exponential coefficient
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t = time