Abstract
In this paper, a comprehensive optimization approach is presented to analyze the aerodynamic, acoustic, and stealth characteristics of helicopter rotor blades in hover flight based on the genetic algorithm (GA). The aerodynamic characteristics are simulated by the blade element momentum theory. And the acoustics are computed by the Farassat theory. The stealth performances are calculated through the combination of physical optics (PO) and equivalent currents (MEC). Furthermore, an advanced geometry representation algorithm which applies the class function/shape function transformation (CST) is introduced to generate the airfoil coordinates. This method is utilized to discuss the airfoil shape in terms of server design variables. The aerodynamic, acoustic, and stealth integrated design aims to achieve the minimum radar cross section (RCS) under the constraint of aerodynamic and acoustic requirement through the adjustment of airfoil shape design variables. Two types of rotor are used to illustrate the optimization method. The results obtained in this work show that the proposed technique is effective and acceptable.
Highlights
The application of the acoustic and radar stealth technology to helicopter rotors has greatly enhanced the battlefield survivability and the combat effectiveness of helicopters [1]
Thickness noise and loading noise belong to the subsonic linear sources, while the helicopter is flying at a low speed [5]
An automated process for the comprehensive optimization design of the aerodynamic, acoustic, and stealth characteristics of the rotor is developed in the article
Summary
The application of the acoustic and radar stealth technology to helicopter rotors has greatly enhanced the battlefield survivability and the combat effectiveness of helicopters [1]. Research on this technology has always been considered and explored by many different countries. The most effective way to improve the helicopter rotor noise and radar stealth abilities is to reduce their aerodynamic noise and radar scattering characteristics [2,3,4]. Aerodynamic noise is one of the main noise sources of helicopter rotors, including thickness noise, loading noise, and highspeed impulse (HSI) noise. The radar stealth performance is one of the essential indexes of helicopter rotor design, and acquiring the high-precision response characteristics of RCS is the key in the stealth design of a helicopter rotor [7,8,9]
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