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About

Hesham A. Elkaranshawy is a leading researcher in the dynamics of rigid multibody systems, with a particular focus on impact, friction, and the notorious Painlevé paradox. His work is essential for understanding and controlling the complex, often counterintuitive behavior of robotic manipulators and mechanical systems during contact and sliding on rough surfaces. Elkaranshawy’s major contributions include developing sophisticated models for rough collisions in three-dimensional systems, where he integrates Coulomb friction with Routh’s incremental impact model and an energetic coefficient of restitution. He has also made significant strides in solving the Painlevé paradox, a phenomenon that leads to non-unique or uncertain solutions and can cause unpredictable bouncing in robotic arms. His 2017 paper on the sliding robot case directly addresses this paradox, providing clarity for spatial robotic systems. With his most cited work, “Rough collision in three-dimensional rigid multi-body systems” (8 citations), and a series of impactful studies on tangential velocity and link-length ratios, Elkaranshawy’s research is foundational for engineers designing more reliable and predictable robotic systems.