In context
As urban pipe networks grow more complex, maintenance robots face increasing demands for maneuverability in confined, curved pipelines. Prior passability models often oversimplified robot geometry, neglecting track width and length, leading to inaccurate design guidance.
What was reported
Researchers from Beijing Institute of Technology proposed a dual-projection analysis method to evaluate the passability of a four-axis tracked pipeline robot in bending pipes. They established a multi-parameter rectangular model based on a traditional cylindrical model, incorporating track length and width as key factors.
Geometric constraint analysis revealed that at any attitude angle between 0° and 45°, the robot's track contact point with the pipe wall is consistently at point n, enabling a differential speed model for cornering. The required radius reduction Δr, a passability metric, decreases with larger attitude angles, indicating better passability at 45° than at 0°.
For a 0° attitude, longer and narrower tracks increase clearance between side tracks and the wall. The study also analyzed multi-section robots with double pendulum arms, simplifying motion to a crank-slider mechanism for vertical T-bends and tight L-bends. Simulations using SolidWorks and Webots confirmed theoretical predictions.
Why it mattered
This work provides a more accurate theoretical basis for designing tracked pipeline robots and their control strategies, potentially improving their reliability in complex urban pipe networks and reducing maintenance costs.
"The research results demonstrate that this study provides theoretical support for both structural design and control strategies of four-axis tracked pipeline robots."
Source: 《机器人》期刊 (robot.sia.cn) · Published 2025-09-16 · “履带式管道机器人的弯管通过性研究”