School of Engineering Department of Mechanical and Aerospace Engineering 150 Department of Mechanical and Aerospace Engineering Development of Protonic Reversible Fuel Cells Supervisor: CIUCCI, Francesco / MAE Student: WANG, Heumil / MECH Course: UROP1100, Fall Materials from the last UROP report were prepared utilizing solid-state reaction. However, there exists an alternative: sol-gel. This paper introduces sol-gel method, including its working principle, sub-processes, experimental procedures, and some advantages it poses over solid-state reaction in an extensive manner. Sol-gel is a simple technique to synthesize microstructures to create an end product with uniform homogeneity and stability by introducing complexing agents to the precursors. One potential it holds is that with sufficient complexing agents, it enables doping of cathode with various metals. With further studies, desired doping, or even exsolution may lead to unique and new characteristics of cathode, which could ultimately lead to breakthroughs in fuel cells. Additive Manufacturing of Wire Metal Stock via Induction Heating Supervisor: DUAN, Molong / MAE Student: KOWALCZYK, Wiktor Marcin / SENG Course: UROP1100, Fall This project is focused on utilizing COMSOL Multiphysics software to simulate the induction heating and metal solidification processes. The induction heating model encountered issues with finding solutions due to the choice of Phase Change Interface physics interface that results in disappearance of initial molten layer in app. 0.05[ms]. To simulate layer deposition, a model using Phase Change Material interface appears to be the most adequate. The results suggest that the minimum temperature of the layer deposited upon a solid bottom layer with ambient temperature of 293.15[K] should be 1200[K] to start remelting it. An alternative approach using Level Set method to simulate the deposition of liquid metal onto a printing bed with changing phase material could be used. Fabrication and Testing of Dragonfly Wings via Continuous Carbon Fiber 3D Printing Supervisor: DUAN, Molong / MAE Student: XU, Ziyi / SENG Course: UROP1100, Summer Dragonfly is acknowledged as a high-efficient flyer in aerodynamic, which can provide some inspirations for the design and manufacturing of the flapping-wing micro air vehicle (FW-MAV). To achieve the efficiency, well-designed flapping-wings are necessary. This paper presents a method exploring the manufacturing of dragonfly wings with continuous fiber-reinforced composite. A wing model is proposed with carbon fiber frame and membrane, including forewing and hindwing. Additive manufacturing of continuous fiberreinforced composite is used to print the frame and different polymer materials as membrane is used to cover the frame. Strategies in flapping-wing design and manufacturing process are put forward. The static and dynamics tests are planned to collect data of the mechanical and aerodynamical properties of the flapping-wing.
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