기구학 해석을 이용한 바이올린 활 연주 로봇팔의 최소 링크 길이 계산

Abstract

For a violin playing robot to be successful as an entertainment robot it needs to portray the image of a human arm playing the violin. Hence it is desired that the robotic manipulator has an articulated structure similar to the human arm. Since shorter link lengths result in smaller link weight, smaller actuator size/weight, and thus fast motion capabilities of the manipulator, it is crucial to determine the minimum link lengths of the manipulator. This paper presents a computation method of the minimum link lengths required for the bow motion and the kinematic design of the violin bow playing robot arm. The workspace of the bow playing arm is analyzed using the geometric dimensions of the bow and the violin bridge. The bow frog motion paths are computed for four violin strings. It is shown that a planar RRR mechanism can generate the motion required for violin bow playing robot, and the minimum link lengths of the manipulator are found that result in the robot workspace encompassing the bow frog motion paths and that avoids the singularities in the robot motion path.