Adaptive Energy Reference Time Domain Passivity Control of Haptic Interfaces

Area of Science:

• Robotics
• Human-Computer Interaction
• Control Systems

Background:

• Haptic devices enable remote and virtual task operation.
• Passivity-based controllers ensure stability by feeding back environmental forces.
• Conventional time domain passivity approaches (TDPA) face challenges with sudden force changes.

Purpose of the Study:

• To present an adaptive energy reference TDPA to mitigate sudden force changes in haptic interactions.
• To enable haptic interfaces to interact with delayed and unknown environments with reduced conservatism.
• To develop a controller that adapts to varying environmental dynamics and time delays.

Main Methods:

• The adaptive energy reference TDPA learns an energy reference through passive estimation of haptic interface energy during interaction.
• Force and velocity data are used to determine the energy reference, eliminating the need for prior knowledge of environment dynamics or time delay.
• The controller's performance is evaluated using simulation and experimental setups with unknown environment parameters.

Main Results:

• The proposed adaptive energy reference TDPA effectively reduces sudden force changes compared to conventional TDPA.
• The method demonstrates applicability to haptic interfaces interacting with delayed and unknown environments.
• The controller successfully adapts to different environments and time delays without increased conservatism.

Conclusions:

• The adaptive energy reference TDPA offers improved performance for haptic devices operating in complex environments.
• This approach enhances stability and reduces undesirable force fluctuations in real-time haptic feedback systems.
• The controller's adaptability makes it suitable for a wide range of haptic applications with uncertain environmental conditions.