T“A Semi-Analytical Semi-Empirical Method for Airframe Component Noise Prediction and its Application”
Speaker: Rui Cheng, Eglin Airforce Base
Date: Friday, March 1, 2019
Location: NIA, Room 137
Abstract: The presentation illustrates a semi-analytical semi-empirical modeling method for the airframe component noise. The method is based on the Ffowcs Williams-Hawking equation for the dipole noise, and it correlates unsteady pressure statistics at airframe component surface and resulting noise at observer location through the Green’s function. The governing equation supplies a solid physical base for the noise generation and propagation mechanism, and guarantee that the developed numerical method is robust. Based on it, a Krueger noise prediction model is developed and calibrated with a phased array test and data analysis, and with supplements of the CFD numerical simulation of the flow field. This application shows the effectiveness of the modeling method, and its efficiency for the practical usage.
Bio: Rui Cheng is currently working in the Eglin Airforce Base for the F-16 flutter problem, where he is investigating how the unsteady aerodynamics interact with the airplane dynamics and affect airplane stability, he is responsible for the numerical model improvement and validation. Rui has worked as an aeroacoustics engineer in Boeing Research & technology from 2010-2017. He was responsible for airplane airframe component noise model development and enhancement. He was also responsible for the BWB and Truss-Brass wing system noise certifications, he investigated what and how the low noise technology can apply to these airplanes and help to reach the NASA’s 42dB noise reduction goal for these airplane. Rui was also responsible for Boeing airplane acoustics modeling from first principle method to the empirical method. Before joined Boeing, Rui was working in Advanced Rotorcraft Technology, Inc., closely working with the NASA AMS researcher on the helicopter rotor aerodynamics. Rui obtained his Ph.D. in aerospace Engineering Department from the Pennsylvania State University in 2007.