Jawaharlal Nehru Technological University Hyderabad B.Tech IV ACTUATORS AND ROBOT SYSTEMS Previous Question Paper (July/August - 2022 - R16)

In the automobile industry, arm-type robots, typically articulated manipulators, serve as the primary workhorses for high-precision tasks. Their main functions include:

• Spot and Arc Welding: These robots provide consistent weld quality and reach complex geometries on vehicle frames that are difficult for manual labor.
• Material Handling and Palletizing: They are used for moving heavy car components, such as engine blocks or chassis parts, from conveyors to assembly stations with high repeatability.
• Painting and Coating: Articulated arms equipped with spray nozzles ensure uniform paint thickness and coverage, reducing material waste and exposure of human workers to toxic fumes.
• Assembly and Fastening: They perform repetitive tasks like bolt tightening, windshield installation, and interior trim fitting, ensuring precise torque application and alignment.

The Roll-Pitch-Yaw (RPY) configuration is a standard method used to describe the orientation of a robot's end-effector relative to a fixed base frame through a sequence of three successive rotations about the principal axes. This convention defines orientation as a product of three elementary rotation matrices.

The rotation sequence is typically defined as follows:

1. Yaw (ψ): Rotation about the Z-axis of the fixed frame.
2. Pitch (θ): Rotation about the new Y-axis of the moving frame.
3. Roll (φ): Rotation about the new X-axis of the moving frame.

The total rotation matrix