A novel method for optimal path synthesis of mechanisms based on tracking control of shadow robot. (January 2019)

• Record Type: Journal Article
• Authors: Sabaapour, Mohammad Reza; Yoon, Jungwon
• Is Part Of: Mechanism and machine theory. Volume 131(2019)
• Page Start: 218
• Page End: 233
• Publication Date: 2019-01
• Subjects: Mechanism -- Path synthesis -- Prescribed crank angles -- Timing, optimal control -- Tracking; Machine theory -- Periodicals; Machinery -- Periodicals; Machines -- Périodiques; Génie mécanique -- Périodiques; Machine theory; Machinery; Periodicals; 621.81
• DOI: 10.1016/j.mechmachtheory.2018.09.018
• Languages: English
• ISSNs: 0094-114X

Abstract

Highlights: A novel method for path synthesis of mechanisms, specially, with prescribed timing. Mechanism is considered as an equivalent multi-DOF controllable robot. An optimized PD controller based on the contour error reflects optimal mechanism. This method allows a compromise between the desired positions and timings. Abstract: In this paper, we present a more effective and robust approach for synthesizing mechanisms such that their path is optimized with respect to the desired trajectory, especially in the case where a particular set of crank angles or timings is also required. Our approach is based on the introduction of a shadow robot that is equivalent to the mechanism and finding an optimal control for it to track the desired trajectory. We propose a contour-error based proportional-derivative (PD) objective function that is inspired by well-known concepts of tracking control theory. This objective function addresses the nature of path synthesis problem more accurately and efficiently. Furthermore, we devised appropriate formulation and adopted an existing global optimization technique to solve the problem. We found that our approach leads to a better optimal solution with higher degree of robustness. We demonstrate the effectiveness of the approach by describing several numerical examples.