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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Lin, K. C. Howe, R. M. |
| Copyright Year | 1991 |
| Description | Author affiliation: Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109 (Howe, R. M.) || Dept. of Mechanical and Aerospace Engineering/Institute for Simulation and Training, University of Central Florida, Orlando, FL 32816 (Lin, K. C.) |
| Abstract | Control systems consisting of a subsystem with discontinuities often cause problems in digital simulation. Real-time simulation of this type of system using conventional fix-step integration algorithms can lead to sizable errors for reasonable step sizes. This paper suggests a new approach which replaces the subsystems with a function table. The dynamic equations of the control subsystem with discontinuities are integrated off-line over a time interval which will be used as the step-size for the on-line integration of the whole contol system. This off-line integration uses a sufficiently small step size and the necessary algorithm to handle the discontinuities of the subsystem. The process is repeated for a matrix of initial conditions and inputs. In the on-line real-time simulation, table lookup and linear interpolation are used to update the subsystem with discontinuities while the rest of the control system is integrated with conventional real-time algorithms. By proper choice of the state variables for the system, the number of variables required in the multiple-variable function can be reduced. A practical example is used to demonstrate the implementation of the method. From the example it is shown that this new approach can lead to reasonable accuracy with a relatively large step size. |
| Starting Page | 2122 |
| Ending Page | 2127 |
| File Size | 457349 |
| Page Count | 6 |
| File Format | |
| ISBN | 0879425652 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1991-06-26 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | American Automatic Control Council(AACC) |
| Subject Keyword | Real time systems Control system synthesis Computational modeling Aerospace simulation Digital simulation Equations Table lookup Interpolation Aerospace engineering Aerodynamics |
| Content Type | Text |
| Resource Type | Article |
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