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Stability and Performance Analysis of Centralized and Distributed Multi-rate Control Architectures for Multi-user Haptic Interaction

Quanser Consulting Inc., 80 ESNA Park Drive, Markham, Ontario L3R-2R6, Canada, Mahyar.Fotoohi{at}Quanser.com

Shahin Sirouspour

Department of Electrical and Computer Engineering, McMaster University 1280 Main St. W., Hamilton, Ontario L8S-4K1, Canada, sirouspour{at}ece.mcmaster.ca

David Capson

Department of Electrical and Computer Engineering McMaster University, 1280 Main St. W., Hamilton, Ontario L8S-4K1, Canada, capson{at}mcmaster.ca

This paper is concerned with multi-user haptic simulation environments in which users can interact across an Ethernet-based Local Area Network (LAN) or a Metropolitan Area Network (MAN). Using network protocols such as the UDP and TCP/IP under normal network traffic conditions, the achievable real-time packet communication rate can be well below the 1 kHz update rate suggested in the literature for high fidelity haptic rendering. However by adopting a multi-rate control strategy, the local control loops can be executed at a much higher rate than that of the data packet transmission between the user workstations. Within such a framework, two control architectures, namely centralized and distributed are presented. Mathematical models of the controllers are developed and used in a comparative analysis of their stability and performance. The results of such analysis demonstrate that the distributed control architecture has greater stability margins and outperforms the centralized controller. It is also shown that the limited network packet transmission rate can degrade the haptic fidelity by introducing a viscous damping into the perceived impedance of the virtual object. Using the proposed models, this damping value is calculated and compensated by active control. Experiments conducted with a dual-user/dual-finger haptic platform confirm the analytical results.

Key Words: Haptics and Haptic Interfaces • Haptic Interface Control • Multi-user Haptics • Cooperative Haptics • Collaborative Haptics • Collaborative Virtual Environments • Multirate Control Systems

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The International Journal of Robotics Research, Vol. 26, No. 9, 977-994 (2007)
DOI: 10.1177/0278364907082049


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This Article Abstract Free Full Text (Free PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Fotoohi, M. Articles by Capson, D. Search for Related Content Social Bookmarking                         What's this?