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Load Ramping

A ramp time entry is provided to allow control over the build-up of dynamic loads and displacements in an analysis with waves and/or vessel motions. For example, wave loads in a regular wave analysis are typically ramped on over one wave period, with the solution proceeding for a further 3-4 wave periods to achieve a steady state solution.

Two options are provided in terms of ramp type, both linear and nonlinear. With the former, the loads increase linearly to their full values between the analysis start to end times. When a Nonlinear ramp is specified (and this is the default), a half cosine ramp function is used (as opposed to a linear function).