UAV End-Effector Decoupling Flight Dynamics for Precision Manipulation
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Solution Overview
Problem
Current UAVs face challenges in achieving high-precision manipulation and transportation of workpieces due to aerodynamic instability and inaccuracy, which limits their ability to grasp and manipulate objects with the required precision, especially in indoor environments.
Innovation Solution
A workpiece manipulation system equipped with an end-effector that includes a lifting mechanism with joint actuators, a gripper with expandable and contractable legs, and a controller for impedance control, allowing the UAV to maneuver and grasp workpieces with improved endpoint accuracy by decoupling flight dynamics from mechanical interactions with the environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional fixed robotic arms are used for precision manipulation, then manipulation accuracy is improved, but facility real estate occupation and system cost increase
Solution Approach 1:
The patent replaces traditional fixed mechanical robotic arms with an aerial vehicle that uses aerodynamic forces for positioning and manipulation. The aerial vehicle hovers using rotors and manipulates workpieces using a robotic arm with gripper, eliminating the need for floor-mounted robotic systems and rails, thus reducing facility real estate requirements while maintaining manipulation capability
Solution Approach 2:
The patent transitions from ground-based two-dimensional manipulation to three-dimensional aerial manipulation. The aerial vehicle operates in the air space above the work area, allowing manipulation from multiple angles and positions without requiring extensive floor space for robotic arm bases and rails
2Ease of manufacture
If consumer UAVs are used for manipulation, then cost is reduced, but endpoint accuracy deteriorates due to aerodynamic instability
Solution Approach 1:
The patent divides the manipulation system into two independent segments: the aerial vehicle platform (using off-the-shelf components for cost-effectiveness) and the robotic arm with end-effector (optimized for precision). This segmentation allows the expensive precision components to be isolated to only where needed, while the majority of the system uses cost-effective consumer UAV components
Solution Approach 2:
The patent introduces a robotic arm with parallel kinematics mechanism as an intermediary between the aerial vehicle and the workpiece. This intermediary provides a stable mechanical reference frame that isolates the precision manipulation tasks from the aerodynamic instability of the aerial vehicle, enabling accurate endpoint control despite platform motion
3Adaptability or versatility
If aerial vehicle is used for manipulation, then mobility and flexibility are improved, but manipulation stability deteriorates due to lack of fixed reference
Solution Approach 1:
The patent implements a dynamic parallel kinematics mechanism in the robotic arm that actively adapts to the moving aerial vehicle platform. The mechanism uses real-time feedback from sensors and controllers to adjust arm configuration and maintain stability during manipulation tasks, transforming the static stability requirement into a dynamic solution that works with rather than against platform motion
Solution Approach 2:
The patent incorporates multiple sensors (cameras, accelerometers, gyroscopes) and closed-loop control systems that continuously monitor the aerial vehicle's position, orientation, and motion. This feedback is used to dynamically adjust the robotic arm and gripper positioning to compensate for platform movement, maintaining manipulation stability despite the mobile platform
Data Source
AI summary
A workpiece manipulation system is disclosed. The workpiece manipulation system is configured to provide high-precision manipulation of a workpiece by an aircraft. The workpiece manipulation system comprises a lifting mechanism to couple with the aircraft, an end-effector, and a processor. The lifting mechanism includes one or more joint actuators to extend or retract the lifting mechanism relative to the aircraft. The end-effector includes an end-effector actuator to control an operation of the end-effector to manipulate the workpiece. The processor is communicatively coupled with an aircraft processor and configured to control operation of the end-effector actuator and the one or more joint actuators.