A Computational Design Analysis of Scotch Yoke Flapping Steel Structure
SAE-PP-00356
09/10/2023
- Content
- The scotch yoke mechanism is a suitable choice for applications that require reciprocating motion, such as in flapping wing structures. This paper presents a computational design analysis of a scotch yoke-driven flapping structure, aiming to mimic bird flight. The scotch yoke mechanism converts rotational motion from a drive rotor into alternating up-and-down linear movement of the wings. The design process involves determining suitable geometrical parameters to achieve flapping motion. Finite element analysis (FEA) is conducted to assess the structural behavior of the flapping structure under operational loads and investigate stress distributions. Additionally, topological optimization is employed to minimize the weight of the structure while maintaining optimal strength and stiffness characteristics within design constraints. The preliminary FEA results reveal high stress concentrations in specific regions of the initial design. Based on these findings, appropriate modifications are made to enhance the strength and fatigue life of the structure in the optimized design. This leads to reductions in maximum deformation, stress, and strain, indicating improved performance. The simulations demonstrate the effectiveness of the scotch yoke design in generating the desired reciprocal flapping motion required for ornithopter flight. Moreover, the ability of the scotch yoke mechanism to convert rotational input into alternating linear wing movement suggests its potential to develop more robust and durable flapping wing designs for real-world unmanned aerial systems. By combining computational design analysis, finite element analysis, and topological optimization, this study provides valuable insights into the design and performance enhancement of scotch yoke-driven flapping structures. The findings contribute to the development of efficient and reliable mechanisms for achieving flapping wing motion in ornithopters, opening up possibilities for advancements in unmanned aerial systems technology.
- Citation
- Rayed, A., "A Computational Design Analysis of Scotch Yoke Flapping Steel Structure," SAE MobilityRxiv™ Preprint, submitted September 10, 2023, https://doi.org/10.47953/SAE-PP-00356.