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A Multi-rate Control Approach to Haptic Interaction in Multi-user Virtual Environments

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3 Author(s)
Fotoohi, M. ; Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont. ; Sirouspour, S. ; Capson, D.

High-fidelity haptic interaction in multi-user environments over general Ethernet-based local area networks (LAN) and metropolitan area networks (MAN) can be challenging but has promising applications. Under typical network traffic conditions, the 1kHz real-time control rate suggested in the literature for stable haptic simulation is well above that achievable by conventional network protocols such as the UDP and TCP/IP. To overcome this limitation, a decentralized multi-rate control approach is proposed in which local force-feedback loops are executed at higher rates than data packet transmission between the user workstations. Mathematical models for stability and performance analysis of such multi-rate haptic control systems are presented. Analytical and experimental results demonstrate improved performance and stability for the distributed control architecture when compared with a centralized controller.

Published in:

Robotics and Automation, 2007 IEEE International Conference on

Date of Conference:

10-14 April 2007

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