The simulation of gas flows in a reciprocating engine requires solution of the equations of gas dynamics because of the pressure waves in the manifolds, for example. The method of characteristics provides a means for solving hyperbolic partial differential equations. We propose in this paper a new way to implement this using ACSL software. After presenting an outline of the method of characteristics and ACSL software, we present a program to solve a simple case: a pressurized pipe with a gradually opening valve. The state event mechanism allows the boundary conditions and the intersections of the characteristics emitted from both ends of the pipe to be dealt with precisely while the solution of the differential equations is realized in a continuous fashion.
The paper describes the complete digital simulation of a four-stands continuous cold strip mill with its sheet supply and coiler. The whole program contains 150 integrators and twenty circular tables for variable delays. All models are non-linear and the programmation is implemented in ACSL language. It includes a part which allows to bring up to date all the parameters of the process simulation and of the regulators coefficients. The simulation acts as the real process and is a powerful means for improving the control of the tension and thickness.
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