Fixed Step Integrator

The ability for the solver to ensure that a fixed amount of work is completed in a given time is frequently a requirement for real-time simulation. As such, Adams Solver supports a fixed step integration option. It can be used to run any Adams model on any platform supported by this version of Adams. It does not use an error tolerance to set the integration step size, set the number of iterations or as criterion to move on. Instead, the user prescribes the integration step size and the number of fixed iterations per integration step. For this reason the fixed step integrator is intended only for real time use cases including offline tuning of its parameters to ensure the proper accuracy-speed balance prior to running real time SiL and/or HiL scenarios. The fixed step integrator also reports some calculations of the simulations speed relative to real time.

To learn more about the fixed step integrator, see Fixed Step Integrator Option. This includes a number of usage and modeling guidelines. Of particular note to some Adams Real Time users is that Adams Car full-vehicle models operating very close to zero velocity can cause difficulty for the fixed integrator and possibly incur real time overruns.

For a hands-on tutorial covering the fixed step integrator, see Using the Fixed Step Integrator.