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image of Research on Quadruped Crawling Robot Control with Finite-Time Observer in Continuous Convex Terrain

Abstract

Background

In recent years, observers have been crucial for controlling quadruped crawling robots, especially for feed-forward compensation in complex terrains. However, their tracking performance in continuous convex terrains requires optimization.

Objective

In order to improve the mobility of quadruped crawling robots by reducing posture adjustment time in continuous convex terrain, a finite-time observer with integration elements and optimized gait planning is proposed.

Methods

First, a buffer phase is introduced into the tripod gait planning to adapt to terrain changes, and the velocity error of the robot's center of mass is analyzed. Second, a coupled robot dynamics model is developed and the disturbance component structure is derived to ensure accurate estimation of the system state, especially in maintaining stability in the face of external disturbances. Finally, the auxiliary variable of the observer is based on the velocity error, with disturbance estimation terms combining power and sign functions, and the cumulative error is introduced by integrating the adjustment functions to improve the tracking performance.

Results

The proposed observer reduces the maximum estimation error at knee and hip joints by 0.63 and 0.425 degrees, respectively, compared to a non-integrated observer. The integral of the absolute error during leg swing is 17.44% to 35.04% of the latter's, and the integral of the squared deviation error is 1.90% to 8.38%. These results demonstrate that the proposed observer can track the state information of the robot with greater accuracy.

Conclusion

The proposed finite-time observer significantly improves motion control for robots in continuous convex terrain and offers insights for enhancing stability in complex environments, which is expected to address the challenges of other robotic manipulator systems in overcoming the effects of external disturbances.

© 2024 Bentham Science Publishers
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2024-10-02
2024-11-26

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/content/journals/eng/10.2174/0118722121312714240821115952
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Research on Quadruped Crawling Robot Control with Finite-Time Observer in Continuous Convex Terrain
Bentham Science Publishers ; https://doi.org/10.2174/0118722121312714240821115952
/content/journals/eng/10.2174/0118722121312714240821115952
/content/journals/eng/10.2174/0118722121312714240821115952
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  • Article Type:     Research Article
Keywords: tripod gait planning ; finite-time observer ; disturbance term ; continuous convex terrain ; Quadruped crawling robot ; high precision tracking

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