networked control system overview and research trends
Download
Skip this Video
Download Presentation
Networked Control System: Overview and Research Trends

Loading in 2 Seconds...

play fullscreen
1 / 17

Networked Control System: Overview and Research Trends - PowerPoint PPT Presentation


  • 126 Views
  • Uploaded on

Networked Control System: Overview and Research Trends. Rachana Ashok Gupta, Member, IEEE, and Mo-Yuen Chow, Fellow, IEEE. Outline. I. INTRODUCTION II. NCS BASICS III. NCS RESEARCH TOPICS AND TRENDS IV. CONCLUSION AND FUTURE RESEARCH. I. INTRODUCTION.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Networked Control System: Overview and Research Trends' - joey


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
networked control system overview and research trends

Networked Control System: Overviewand Research Trends

Rachana Ashok Gupta, Member, IEEE, and Mo-Yuen Chow, Fellow, IEEE

outline
Outline
  • I. INTRODUCTION
  • II. NCS BASICS
  • III. NCS RESEARCH TOPICS AND TRENDS
  • IV. CONCLUSION AND FUTURE RESEARCH
i introduction
I. INTRODUCTION
  • Definition: When a traditional feedback control system is closed via a communication channel (such as a network), which may be shared with other nodes outside the control system, then the control system is classified as a networked control system (NCS).
ii ncs basics
II. NCS BASICS
  • NCS research is categorized into the following two parts
  • 1) Control of network
    • Study and research on communications and networks to make them suitable for realtime NCSs, e.g., routing control, congestion reduction, efficient data communication, networking protocol, etc.
  • 2) Control over network
    • This deals more with control strategies and control system design over the network to minimize the effect of adverse network parameters on NCS performance such as network delay.
challenges
Challenges
  • Maintain the quality of service (QoS) and the quality of control (QoC).
  • QoS is the idea that transmission rates, error rates, and other characteristics can be measured, improved, and, to some extent, guaranteed in advance.
  • QoC is a runtime strategy where the quality (or performance) of a set of applications with real-time requirements is managed.
iii ncs research topics and trends
III. NCS RESEARCH TOPICS AND TRENDS
  • A. Networking Technologies—Evolution and Research
  • B. Network Delay Effect
  • C. Fault-tolerant control (FTC) in NCS
  • D. Bandwidth Allocation and Scheduling
  • E. Network Security in NCS
  • F. Integration of Components in NCS
a networking technologies evolution and research
A. Networking Technologies—Evolution and Research
  • ARPANET
    • 1969
  • Controller Area Network (CAN)
    • 1980s
  • Fieldbus
    • 1989
  • Ethernet
    • the most widely implemented physical and link layer protocol today.
  • Internet
    • the most suitable and inexpensive choice for many applications where the plant and the controller are far away from each other.
  • Wireless NCS (WNCS)
    • Motivation: mobile operations, flexible installations, and rapid deployments
    • 802.11 a/b/g, bluetooth, ZigBee …
  • Colandairaj et al. demonstrated that the principles of codesign, the merging of communication technology with control theory
b network delay effect
B. Network Delay Effect
  • The network can introduce unreliable/nondeterministic levels of service in terms of delays, jitter, and losses.
  • Time-sensitive applications can be either hard real time or soft real time
1 modeling and analysis of network delays
(1) Modeling and Analysis of Network Delays
  • Network delays are modeled and analyzed in various ways. They can be modeled as
  • a constant delay (timed buffer)
  • an independent random delay
  • a delay with known probability distribution governed by the Markov chain model
2 delay compensation1
(2) Delay Compensation

Other solutions includes:

  • Stability and stabilization of a class of multimode systems
  • A gain scheduler middleware (GSM)
  • A delay-independent stability condition
  • Control prediction generator and a network delay compensator(precise delay time models are needed)
  • A time delay compensation method based on the
  • Concept of network disturbance and communication disturbance observer(delay time model is not needed)
  • A networked predictive controller in the presence of random network delay in both the forward and feedback channels.
  • Represented nonlinear NCSs by a T-S fuzzy model
  • Discrete-model switch system for NCSs with time delay and packet drop
  • A state feedback controller for NCSs for asymptotic stability
c ftc in ncs
C. FTC in NCS
  • Fault tolerance is implemented to prevent faults from propagating through the system.
  • Patankar presented a model in [69] for a fault-tolerant NCS using time-triggered protocol communication.
  • Huoet al. [68] studied scheduling and control codesign for a robust FTC of NCS based on robust H∞ FTC idea.
  • Wang et al. [71] proposed a fault detection approach for NCS, which considers the influence of unknown and random network-induced delay as multiplicative faults.
  • Mendes et al. [70] proposed a multiagentplatformbased on decentralized design and distributed computing for FTC systems.
  • Zhu and Zhou [72] applied a states-observerbased fault detection approach on the uncertain long-time-delay NCS without changing the system construction.
  • A procedure for controlling a system over a network using the concept of an NCS information packet is described by Klinkhieoet al. in [73]. This procedure is composed of an augmented vector consisting of control moves and fault flags. The size of this packet is used to define a completely fault-tolerant NCS.
d bandwidth allocation and scheduling
D. Bandwidth Allocation and Scheduling
  • Objective: minimizing the cost and maximizing the service data flow.
  • The network scheduling method should have a basic sampling time within maximum allowable delay bound (MADB) while still guaranteeing real-time transmission.
  • 1) NCS Scheduling Approaches
    • Rate monotonic scheduling (RMS)
  • 2) DBA: Dynamic bandwidth allocation
    • supporting multimedia applications like VoIP, video traffic, and ATM networks.
e network security in ncs
E. Network Security in NCS
  • A biologically inspired learning model for multiagent IDS utilized in the network infrastructures of industrial plants.
  • methods to determine and reduce the vulnerability of NCS to unintended and malicious intrusions for an industrial plant
  • policy-based network security technologies and XML processing technologies
  • characterized the WNCS application on the basis of security effect on NCS performance
  • D. Dzung, M. Naedele, T. P. Von Hoff, and M. Crevatin, “Security for industrial communication systems,” Proc. IEEE, vol. 93, no. 6, pp. 1152–1177, Jun. 2005.
f integration of components in ncs
F. Integration of Components in NCS

Aim

  • Integration of the individual modules.
  • A well-designed software architectural framework and a middleware are critical.

Areas:

  • autonomous vision-based navigation, obstacle avoidance, and convoy tracking;
  • process information from a large number of diverse sensors using multilevel symbolization;
  • highly integrated control and programming platform named Motronic in automotive industry
iv conclusion and future research
IV. CONCLUSION AND FUTURE RESEARCH

Conclusion

  • Network delay compensation and resource allocation have been analyzed since the advent of NCS.
  • Scheduling, network security with NCS, fault tolerance are the ones which came into focus later.

Unsolved problems

  • The real-time secured control.
  • Designing an FTC system for a large-scalecomplex NCS
  • Build new protocols which will give the flexibility to the system and make it time independent
  • Multiagent traffic control in urban areas with efficient vehicle communication, includes correct data estimation, data fusion in real time to make robust decisions.
more referneces
More referneces
  • Colandairaj, J.; Scanlon, W.; Irwin, G.; "Understanding wireless networked control systems through simulation," Computing & Control Engineering Journal , vol.16, no.2, pp. 26- 31, April-May 2005
  • J. Colandairaj, G. W. Irwin, and W. G. Scanlon, “A co-design solution for wireless feedback control,” in Proc. IEEE Int. Conf. Netw., Sens. Control, 2007, pp. 404–409.
  • D. Dzung, M. Naedele, T. P. Von Hoff, and M. Crevatin, “Security for industrial communication systems,” Proc. IEEE, vol. 93, no. 6, pp. 1152–1177, Jun. 2005.
ad