Akademik Veri Yönetim Sistemi
2nd IFToMM International Symposium on Emerging Fields in Mechanism and Machine Science, EFIMMS 2026, Monastir, Tunus, 15 - 17 Nisan 2026, cilt.205, ss.116-125, (Tam Metin Bildiri)
This study presents the development of a novel biomechanical model for forearm pronation–supination (PS) motion that introduces a two-degree-of-freedom mechanism. The model includes a moving rotational axis (MRA) to represent the PS axis of the forearm. Furthermore, whereas some previous models allow only translational motion of the ulna, the new design integrates an additional revolute joint at the elbow, combined with a prismatic joint, to capture anatomically relevant rotational behavior of the ulna. Compared with previous approaches, which incorporate four segments (elbow, wrist, ulna, and radius) but do not account for the distal inclination of the moving rotational axis, the current mechanism introduces this inclination through a variable slope of the proximal revolute-prismatic joint pair. Similar to anatomically grounded three-segment structure, the proposed model also employs three segments, offering a balance of biomechanical realism and kinematic simplicity. The resulting mechanism is compared with previous models and demonstrates similar PS behavior while providing a more anatomically complete representation of ulnar motion. This work contributes a novel and efficient modeling strategy for studying forearm kinematics in biomechanical and rehabilitation applications.