TAILIEUCHUNG - InTech-Climbing and walking robots towards new applications Part 5

Tham khảo tài liệu 'intech-climbing and walking robots towards new applications part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 120 Climbing Walking Robots Towards New Applications movement of the links in the robot. The existence of this underactuated DOF that can not be directly controlled is one of the most important features in bipedal walk. Fig. 7. Five segments model for biped walk considering internal torques The variables for the dynamical model with internal torques are ff r -. 1 ffi 1 2 e ff2 - 2 3 ff3 3 4 ff4 _ . 4 - 5 . - T1 - T2 - T3 T4 T5 T1 T2 T3 - T4 - T5 T2 - T3 T4 T5 T3 T4 T5 T4 _ . - T5 . 22 The gait equations for this model have the general form d ffff h ff ff g ff T 23 The components for the matrices in the previous equation are obtained directly from the dynamical model with external torques. Matrix of inertial terms d 6 dffff di1 di2 di3 di4 di5 i l 2 . 5 with dii -Ai1 - Ai2 - Ai3 Ai4 Ai5 di2 -Ai2 - Ai3 Ai4 Ai5 di3 Ai3 - Ai4 - Ai5 di4 Ai4 Ai5 di5 - Ai5 24 and Alj -Dij - D2j - D3 j D4j DSJ A2 j D2 j D3 j - D4 j - D5 j A3 j - D3 j D4 j D5 A4 j D4 j D5 j A5 j -D5 j j 1 2 5 Design Methodology for Biped Robots Applications in Robotics and Prosthetics 121 Vector of coriolis and centripetal forces H q p h1 - H1 - H2 - H3 H4 H5 h2 H 2 H 3 - H 4 - H 5 h 0 ff h3 - H3 H4 H5 25 h4 H 4 H 5 A. . - H5 . Vector of gravitational effects G p g W g1 g 2 g3 g 4 Lg 5 J - G1 - G2 - G3 G4 G5 G2 G3 - G4 - G5 - G3 G4 G5 G4 G5 - G5 26 The initial data to solve the model are 1 geometrical data basic dimensions of the robot and 2 kinematical data angular positions velocities and accelerations in each joint . The kinematical data can be either data from a passive walk model as the kneed passive walker or data from a human gait analysis. Our human gait patterns were obtained in the gait laboratory at CIREC Colombian Research Institute for Human Rehabilitation Fig. 8 shows a gait analysis and Fig. 9 illustrates the type of data obtained in the lab in this case the angular positions for each one of the joints. The dynamical model can be simulated to get torque charts for each of the actuators .

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