Contact transition control with acceleration feedback enhancement for a quadrotor

Area of Science:

• Robotics
• Control Systems
• Unmanned Aerial Vehicles (UAVs)

Background:

• Stable transitions between free-motion and contact phases are critical for UAVs interacting with objects and environments.
• Uncontrolled oscillations can occur during contact if force controllers cannot adapt to unknown environmental parameters.

Purpose of the Study:

• To propose an acceleration feedback control strategy to enhance the robustness of classic force controllers for UAVs.
• To achieve smooth and stable contact transitions for UAVs interacting with environments of varying stiffness, even with a non-zero approaching velocity.

Main Methods:

• Developed and implemented an acceleration feedback control algorithm integrated with a classic force controller.
• Conducted extensive flight tests on a quadrotor UAV platform.
• Compared the performance of the proposed algorithm against a baseline controller without acceleration feedback.

Main Results:

• The proposed acceleration feedback control significantly improved the stability and smoothness of contact transitions.
• The UAV demonstrated robust performance across environments with different stiffness properties.
• Experimental results validated the effectiveness of the acceleration feedback enhancement.

Conclusions:

• Acceleration feedback control enhances the robustness of UAV force controllers for stable physical interactions.
• The proposed method enables smoother and more reliable transitions in unknown and variable stiffness environments.
• This approach is crucial for advanced UAV applications requiring physical interaction capabilities.