UROP Proceedings 2021-22

School of Engineering Department of Mechanical and Aerospace Engineering 160 Ambular: An Emergency Response Drone Supervisor: LI Larry / MAE Student: CHOI Tsz Kik / MAE LAU Siu Man / AE Course: UROP1100, Fall UROP1100, Fall For the Ambular fuselage, we experimentally investigated the performance of two main designs: a doublebubble design, and a hawk design. This report focuses primarily on the first design. Originally, wind tunnel testing and computational fluid dynamics (CFD) simulations had been planned near the end of the semester. However, due to technical and scheduling issues partly arising due to the pandemic, wind tunnel testing could not be performed as scheduled. Therefore, this report focuses mainly on CFD simulations done using Solidworks. The numerical data generated by the CFD simulations will help guide the design of future wind tunnel experiments conducted on the Ambular drone. Early Detection of Thermoacoustic Instability in Solid Rocket Motors Supervisor: LI Larry / MAE Student: GANI Bryan Suryaraso / MAE Course: UROP2100, Fall Thermoacoustic instability is an important problem in combustion systems. It may lead to excessive fatigue loading and structural failure of the entire system. Effective and timely control of the phenomenon is necessary to prevent catastrophic failure. However, thermoacoustic systems are highly complex and nonlinear, so it is essential for model-based control methods to have access to a representative systemmodel. In this project, we used the framework of SINDy (Sparse Identification of Nonlinear Dynamics) to discover a model representative of a real thermoacoustic system, namely a Rijke tube driven by a laminar premixed flame. The output of the Rijke tube is simulated and fitted by the SINDy model. In this way, we were able to derive a surrogate model of the Rijke tube, which could then be used in the future to develop new passive and active control strategies.