Abstract
The work shows that the sampling in a digital PD controller of a flexible system may cause instability, while the continuous PD control system is stable. A procedure is introduced to define the stability regions analytically in the gain space. A closed form stability criterion is derived for a system consists of a single rigid mode and one flexible mode. The procedure is applied successfully also for the case of single rigid mode considering the computation time in addition to sampling period. A comparison with the literature shows that this procedure is straightforward, gives more accurate result and even corrects some stability regions published in the literature. A computer program is constructed using MATLAB to determine the stability region for a system that consists of a single rigid mode and arbitrary number of flexible modes. This simulates many practical systems such as flexible robot arms, disk-drive servos and antenna systems. The results show that the stability regions can be approximated by a right triangle in the gain space. Analytical expressions are derived to define such triangles.
| Original language | English |
|---|---|
| Pages (from-to) | 253-281 |
| Number of pages | 29 |
| Journal | Engineering Journal of University of Qatar |
| Volume | 15 |
| Publication status | Published - 2002 |
| Externally published | Yes |
Keywords
- Digital control
- Flexible systems
- PD control
- Sampled-data systems
- Stability analysis