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Optimizing dynamic locomotion in Baleka II: from simulation to real-world running
In the field of legged locomotion, agility is a critical area of research in robotics due to its potential to enable versatile movement for various applications, including search and rescue missions. However, bipedal robots face significant challenges in achieving rapid movements, such as maintainin...
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| Format: | Thesis |
| Language: | English English |
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Department of Electrical Engineering
2025
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| _version_ | 1867614500067213312 |
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| access_status_str | Open Access |
| author | Martin, Zubair |
| author2 | Shield, Stacey |
| author_browse | Martin, Zubair Shield, Stacey |
| author_facet | Shield, Stacey Martin, Zubair |
| author_sort | Martin, Zubair |
| collection | Thesis |
| description | In the field of legged locomotion, agility is a critical area of research in robotics due to its potential to enable versatile movement for various applications, including search and rescue missions. However, bipedal robots face significant challenges in achieving rapid movements, such as maintaining stability and agility. This dissertation presents the development of Baleka II, a bipedal robot designed to overcome these challenges by achieving rapid legged locomotion through open-loop control. Building upon its predecessor, this research seeks to evaluate the robot's capacity to perform agile tasks by incorporating trajectory optimization algorithms and conducting real-world experiments. The study is structured around four primary objectives: improving the embedded system configuration, generating control trajectories using trajectory optimization, validating these solutions through simulations, and implementing them on the physical robot. The key locomotive tasks investigated include acceleration, deceleration (gait termination), and steady-state walking/running. The control system was implemented using the Speedgoat Real-Time Target Machine, integrating Simulink Real-Time and Simscape Multibody for real-time execution. Trajectory optimization was accomplished using Pyomo and Interior Point Optimizer (IPOPT), producing solutions for walking (0.5 m/s), walk-to-run transitions (1.5 m/s), and maximum forward speeds (4.0 m/s). Simulations were used to verify these solutions, taking into account the robot's physical constraints. Despite the use of open-loop control, stability was maintained through proportional-derivative (PD) controllers for each motor. The key findings of this research indicate that as the robot's speed increased, so did the actuation effort, peak torque, and GRFs, leading to velocity discrepancies and high deceleration upon ground contact. Nevertheless, Baleka II was able to accelerate into 3.2 m/s steady-state gait and decelerate in a stable manner, demonstrating competitive acceleration and deceleration rates relative to other bipedal robots. These results offer valuable insights into the use of open-loop optimal control for achieving rapid transitions in bipedal robots, with potential applications in search and rescue, industrial assistance, and entertainment. Future work will focus on enhancing the robot's deceleration capabilities, integrating additional sensors, exploring advanced control techniques, and testing the robot on uneven terrain. These efforts will further expand the potential of Baleka II for real-world applications. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/42434 |
| institution | University of Cape Town (South Africa) |
| language | English eng |
| last_indexed | 2026-06-10T12:53:01.662Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/42434 Optimizing dynamic locomotion in Baleka II: from simulation to real-world running Martin, Zubair Shield, Stacey Patel, Amir engineering In the field of legged locomotion, agility is a critical area of research in robotics due to its potential to enable versatile movement for various applications, including search and rescue missions. However, bipedal robots face significant challenges in achieving rapid movements, such as maintaining stability and agility. This dissertation presents the development of Baleka II, a bipedal robot designed to overcome these challenges by achieving rapid legged locomotion through open-loop control. Building upon its predecessor, this research seeks to evaluate the robot's capacity to perform agile tasks by incorporating trajectory optimization algorithms and conducting real-world experiments. The study is structured around four primary objectives: improving the embedded system configuration, generating control trajectories using trajectory optimization, validating these solutions through simulations, and implementing them on the physical robot. The key locomotive tasks investigated include acceleration, deceleration (gait termination), and steady-state walking/running. The control system was implemented using the Speedgoat Real-Time Target Machine, integrating Simulink Real-Time and Simscape Multibody for real-time execution. Trajectory optimization was accomplished using Pyomo and Interior Point Optimizer (IPOPT), producing solutions for walking (0.5 m/s), walk-to-run transitions (1.5 m/s), and maximum forward speeds (4.0 m/s). Simulations were used to verify these solutions, taking into account the robot's physical constraints. Despite the use of open-loop control, stability was maintained through proportional-derivative (PD) controllers for each motor. The key findings of this research indicate that as the robot's speed increased, so did the actuation effort, peak torque, and GRFs, leading to velocity discrepancies and high deceleration upon ground contact. Nevertheless, Baleka II was able to accelerate into 3.2 m/s steady-state gait and decelerate in a stable manner, demonstrating competitive acceleration and deceleration rates relative to other bipedal robots. These results offer valuable insights into the use of open-loop optimal control for achieving rapid transitions in bipedal robots, with potential applications in search and rescue, industrial assistance, and entertainment. Future work will focus on enhancing the robot's deceleration capabilities, integrating additional sensors, exploring advanced control techniques, and testing the robot on uneven terrain. These efforts will further expand the potential of Baleka II for real-world applications. 2025-12-11T11:12:17Z 2025-12-11T11:12:17Z 2025 2025-12-11T11:09:50Z Thesis / Dissertation Masters MSc http://hdl.handle.net/11427/42434 en eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | engineering Martin, Zubair Optimizing dynamic locomotion in Baleka II: from simulation to real-world running |
| thesis_degree_str | Master's |
| title | Optimizing dynamic locomotion in Baleka II: from simulation to real-world running |
| title_full | Optimizing dynamic locomotion in Baleka II: from simulation to real-world running |
| title_fullStr | Optimizing dynamic locomotion in Baleka II: from simulation to real-world running |
| title_full_unstemmed | Optimizing dynamic locomotion in Baleka II: from simulation to real-world running |
| title_short | Optimizing dynamic locomotion in Baleka II: from simulation to real-world running |
| title_sort | optimizing dynamic locomotion in baleka ii from simulation to real world running |
| topic | engineering |
| url | http://hdl.handle.net/11427/42434 |
| work_keys_str_mv | AT martinzubair optimizingdynamiclocomotioninbalekaiifromsimulationtorealworldrunning |