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Case Study

Optimizing Humanoid Robot Mechanical Design and Motion Control Using Ansys Simulation Tools

“Using Ansys solutions allowed us to iterate our humanoid robot’s design with confidence. The ability to simulate mechanical stresses, actuator loads, and kinematic behavior before building helped us catch design flaws early. It accelerated our progress, saved material costs, and made us stronger engineers.”

-Abhinav Swarup, President, Triton Droids

At Triton Droids, a student team from the University of California, San Diego, students set out to build a life-size humanoid robot capable of complex motion and stability. Humanoid robots represent the future of robotics, and building one gives students invaluable hands-on experience in an emerging field that bridges mechanical design, control systems, and artificial intelligence (AI).

To meet strict mechanical and power constraints, the team turned to engineering simulation. Ansys software enabled the team to validate and optimize structural integrity and actuator dynamics before physical prototyping, saving valuable time and resources.

Challenges

Designing a humanoid robot involves complex mechanical linkages and multiple degrees of freedom. Balancing weight, strength, and agility while ensuring efficient motor and joint operation proved to be a significant challenge. Calculating joint torques in the leg was difficult, as each joint’s required torque depends on both the motor specifications and the weight of components further down the chain. As a result, simulation became essential for accurately predicting performance under load, reducing overall weight, and minimizing the risk of mechanical failure.

CAD model humanoid leg

Computed-aided engineering (CAD) model of Triton Droids’ five degrees of freedom (DOF) humanoid leg with modular joints for the hip, knee, and ankle

Engineering Solutions 

  • Ansys Mechanical software helped the team simulate the load on the robot’s joints and frame to ensure structural integrity.
  • Ansys Motion software helped optimize actuator and linkage dynamics, especially for walking and balance.
  • With Ansys solutions, the team was able to analyze material stress and deformation during dynamic actions like standing, walking, and object manipulation.
baxter industrial robot

Baxter industrial robot donated by the team’s advisor, which was used for manipulation and perception research

Benefits

Using Ansys software drastically reduced trial-and-error cycles. Students identified and corrected weak points before manufacturing, which saved time and reduced costs. It also accelerated learning: by comparing simulation data with real-world testing, the team gained a deeper understanding of force transmission, balance, and system dynamics in robotics.

leg prototype demonstration

Demonstration of the leg prototype featuring three DOF at the hip, one DOF at the knee, and one DOF at the ankle

joint layout humanoid leg

Joint layout of the humanoid leg with degrees of freedom depicted

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