Results of the flight noise measurement program using a standard and modified SH-3A helicopter [PDF]
A field noise measurement program has been conducted using both a standard SH-3A helicopter and an SH-3A helicopter modified to reduce external noise levels.
Henderson, H. R. +2 more
core +1 more source
Research on Characteristics of Helicopter Engine Bleed Airflow Limitation and Temperature Drop
Nanjing Hangkong Hangtian Daxue XuebaoThe helicopter’s environmental control system is restricted from drawing more than its engine’s maximum allowed bleed air volume to avoid excessive power loss.
LUO Pinggen +3 more
doaj +1 more source
Helicopter far-field acoustic levels as a function of reduced main-rotor advancing blade-tip Mach number [PDF]
During the design of a helicopter, the weight, engine, rotor speed, and rotor geometry are given significant attention when considering the specific operations for which the helicopter will be used. However, the noise radiated from the helicopter and its
Lemasurier, Philip +2 more
core +1 more source
A Lightweight Convolutional Neural Network for Real-time Detection of Aircraft Engine Blade Damage
Journal of Applied Science and EngineeringTo address the large number of parameters and the computational complexity of deep learning models in the field of borescope detection, we propose a lightweight blade damage detection model LSSD using a knowledge distillation algorithm.
Wenzhe Wang +4 more
doaj +1 more source
Fast Aerodynamic Prediction of Airfoil with Trailing Edge Flap Based on Multi-Task Deep Learning
AerospaceConventional methods for solving Navier–Stokes (NS) equations to analyze flow fields and aerodynamic forces of airfoils with trailing edge flaps (TEFs) are known for their significant time cost.
Chi Zhang +3 more
doaj +1 more source
Rotary-wing aircraft terrain-following/terrain-avoidance system development [PDF]
Work being accomplished to develop a real-time, piloted simulation of a helicopter using the vertical motion simulator at NASA Ames is discussed.
Dorr, Dan W.
core +1 more source
Sand Ingestion Behavior of Helicopter Engines During Hover in Ground Effect
AerospaceSand ingestion exerts significant effects on the performance of helicopter engines, and it is imperative to investigate this phenomenon. In this study, the mechanisms of engine sand ingestion during helicopter hover in ground effect are analyzed. Firstly,
Qiang Li +3 more
doaj +1 more source
A Lagrange-D'Alembert formulation of the equations of motion of a helicopter carrying an externally suspended load [PDF]
The exact nonlinear equations of motion are derived for a helicopter with an extenal load suspended by fore and aft, rigid-link cables. Lagrange's form of D'Alembert's principle is used.
Greif, R. K., Weber, J. M.
core +1 more source
Model Tests on the Economy and Effectiveness of Helicopter Propellers [PDF]
The average velocity of helicopter blades relative to the air is greater than that of airplane wings. The helicopter may turn out to be more economical than the airplane wing for extreme velocities of horizontal flight, the airplane then requiring a very
Munk, Max M
core +1 more source
The NASA/industry Design Analysis Methods for Vibrations (DAMVIBS) program: McDonnell-Douglas Helicopter Company achievements [PDF]
This paper presents a summary of some of the work performed by McDonnell Douglas Helicopter Company under NASA Langley-sponsored rotorcraft structural dynamics program known as DAMVIBS (Design Analysis Methods for VIBrationS).
Hashemi-Kia, Mostafa +2 more
core +1 more source