Optimal damping ratio for linear second-order systems |
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| Authors: | S. M. Shahruz G. Langari M. Tomizuka |
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| Affiliation: | (1) Berkeley Engineering Research Institute, Berkeley, California;(2) Engineering Systems Research Center, University of California, Berkeley, California;(3) Department of Mechanical Engineering, University of California, Berkeley, California |
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| Abstract: | In this paper, it is shown that the optimal damping ratio for linear second-order systems that results in minimum-time no-overshoot response to step inputs is of bang-bang type. The optimal damping ratio is zero at the outset and is switched to some maximum value at an appropriate instant of time. The switching time is shown to be a function of the maximum damping ratio and the system natural frequency. Furthermore, it is shown that the larger the maximum damping ratio is, the shorter it takes for the system to reach the desired set point. Finally, it is shown that, if the optimal damping ratio is switched as a function of the system state, then the minimum-time no-overshoot criterion is satisfied, irrespective of the magnitude of the uncertainty in the value of the system natural frequency. |
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| Keywords: | Linear second-order systems damping ratio minimum-time response no-overshoot constraint uncertain natural frequency |
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