The Arbitrated Networked Control Systems Approach to Designing Cyber-Physical Systems

Annaswamy, Anuradha M.; Chakraborty, Samarjit; Soudbakhsh, Damoon; Goswami, Dip; Voit, Harald

doi:10.3182/20120914-2-us-4030.00062

Cited by 14 publications

(17 citation statements)

References 13 publications

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“…1 The resource available to the control task at each PE i is modeled by a pair of service functions, β i = (β u i , β l i ), where β u i (∆) and β l i (∆) denote the maximum and minimum number of samples that can be processed by the PE over any time interval of length ∆ time units, respectively, for all ∆ ≥ 0. These functions can be computed based on the PE's operating frequency (network bandwidth) and the worst-case and best-case execution demands of each sample [8].…”

Section: System Modelmentioning

confidence: 99%

“…In a complete setting (e.g., Fig. 14), the system may share the platform resource with other applications; hence, we first compute the service functions, β i , of the resource available to the control task at each PE (e.g., using the 1 The maximum buffer size can be computed using the method in [8].…”

Section: System Modelmentioning

confidence: 99%

“…Very few of these papers however have dealt with co-designs. Using a drop frequency metric based on maximum number of drops after each successful signal was presented in [1,15,30]. However, these studies result in conservative analysis since each successful sample should compensate for a number of drops.…”

Section: Introductionmentioning

confidence: 99%

“…There have also been attempts to close this gap through a systematic co-design of controllers and the platform [7,15,16,19,23,26,27,29]. Quite often some of these codesigns lead to an inherent switched system whose stability is analyzed using tools such as Average Dwell time approach [13], and common quadratic Lyapunov functions [1,18]. Research in NCS in the context of dropped signals has been carried out in [1,15,17,30].…”

Section: Introductionmentioning

confidence: 99%

“…Quite often some of these codesigns lead to an inherent switched system whose stability is analyzed using tools such as Average Dwell time approach [13], and common quadratic Lyapunov functions [1,18]. Research in NCS in the context of dropped signals has been carried out in [1,15,17,30]. The common approach is to use a sample and hold block and analyze system stability [14,17,30].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Co-design of control and platform with dropped signals

Soudbakhsh

Phan

Sokolsky

et al. 2013

Proceedings of the ACM/IEEE 4th International Conference on Cyber-Physical Systems

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This paper examines a co-design of control and platform in the presence of dropped signals. In a cyber-physical system, due to increasing complexities such as the simultaneous control of several applications, limited resources, and complex platform architectures, some of the signals transmitted may often be dropped. In this paper, we address the challenges that arise both from the control design and the platform design point of view. A dynamic model is proposed that accommodates these drops, and a suitable switching control design is proposed. A Multiple Lyapunov function based approach is used to guarantee the stability of the system with the switching controller. We then present a method for optimizing the amount of platform resource required to ensure stability of the control systems via a buffer control mechanism that exploits the ability to drop signals of the control system and an associated analysis of the drop bound. The results are demonstrated using a case study of a co-designed lane keeping control system in the presence of dropped signals.

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Section: System Modelmentioning

confidence: 99%

Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%