| Title |
Design of Knee-Pelvis Joint in the Biped Robot for Shock Reduction and Gravity Compensation |
| Authors |
김영민(Kim, Young-Min) ; 김용태(Kim, Yong-Tae) |
| DOI |
https://doi.org/10.5370/KIEE.2015.64.1.136 |
| Keywords |
Biped Robot ; Shock Reduction ; Gravity Compensation ; Knee Joint ; Pelvis Joint ; Energy Consumption |
| Abstract |
In the paper, a design method of knee and pelvis joint in the biped robot is proposed for shock absorption and gravity compensation. Similarly to the human's body, the knee joints of the biped robot support most body weight and get a shock from the landing motion of the foot on the floor. The torque of joint motor is also increased sharply to keep the balance of the robot. Knee and pelvis joints with the spring are designed to compensate the gravity force and reduce the contact shock of the robot. To verify the efficiency of the proposed design method, we develope a biped robot with the joint mechanism using springs. At first, we experiment with the developed robot on the static motions such as the bent-knee posture both without load and with load on the flat ground, and the balance posture on the incline plane. The current of knee joint is measured to analyze the impact force and energy consumption of the joint motors. Also, we observe the motor current of knee and pelvis joints for the walking motion of the biped robot. The current responses of joint motors show that the proposed method has an effect on shock reduction and gravity compensation, and improve the energy efficiency of walking motions for the biped robot. |