# Dynamic Motion-Based Optimization of Support and Transmission Mechanisms for Legged Robots

## TL;DR

This paper introduces a method to optimize legged robot mechanisms for better dynamic performance by reducing motor torque and speed requirements.

## Contribution

A novel dynamic motion-based optimization method for legged robot support and transmission mechanisms is proposed.

## Key findings

- Optimizing the support mechanism reduces the impact of motion range and mass on robot performance.
- Transmission mechanism optimization lowers knee joint motor peak torque by 18.5% and peak speed by 24.8%.

## Abstract

In order to improve the dynamic performance of legged robots, this paper proposes a method for optimizing the parameters of the leg mechanism based on dynamic motion. The proposed method consists of two key parts as follows: support mechanism optimization and transmission mechanism optimization. For the support mechanism, a mechanism analysis index based on robot motion energy is introduced to evaluate the robot dynamic motion performance. Under the structure stiffness constraint, this index can quantitatively analyze the influence of the range of motion and structure mass on the robot motion performance, thereby guiding the design of parameters such as the range of motion, structure thickness, and U-flange position of the mechanism. For the transmission mechanism, this paper optimizes the linkage length and knee joint angle for transmission ratio. Considering the variable transmission ratio and robot motion characteristics, the parameters are optimized to reduce the torque and speed requirements of the leg joint. This method determines the optimal mechanism parameters for dynamic performance based on the specified motion energy requirements, and it also optimizes the linkage length. The results show that the peak torque of the knee joint motor is reduced by 18.5%, and the peak speed is reduced by 24.8%.