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International Journal of Aerospace Engineering
Volume 2017 (2017), Article ID 1865751, 13 pages
https://doi.org/10.1155/2017/1865751
Research Article

Performance and Vibration Analyses of Lift-Offset Helicopters

1Department of Aerospace Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
2Rotorcraft Research Team, Korea Aerospace Research Institute, Daejeon 34133, Republic of Korea

Correspondence should be addressed to Jae-Sang Park; rk.ca.unc@rotorea

Received 20 March 2017; Revised 21 April 2017; Accepted 30 April 2017; Published 15 June 2017

Academic Editor: Davide Micheli

Copyright © 2017 Jeong-In Go et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A validation study on the performance and vibration analyses of the XH-59A compound helicopter is conducted to establish techniques for the comprehensive analysis of lift-offset compound helicopters. This study considers the XH-59A lift-offset compound helicopter using a rigid coaxial rotor system as a verification model. CAMRAD II (Comprehensive Analytical Method of Rotorcraft Aerodynamics and Dynamics II), a comprehensive analysis code, is used as a tool for the performance, vibration, and loads analyses. A general free wake model, which is a more sophisticated wake model than other wake models, is used to obtain good results for the comprehensive analysis. Performance analyses of the XH-59A helicopter with and without auxiliary propulsion are conducted in various flight conditions. In addition, vibration analyses of the XH-59A compound helicopter configuration are conducted in the forward flight condition. The present comprehensive analysis results are in good agreement with the flight test and previous analyses. Therefore, techniques for the comprehensive analysis of lift-offset compound helicopters are appropriately established. Furthermore, the rotor lifts are calculated for the XH-59A lift-offset compound helicopter in the forward flight condition to investigate the airloads characteristics of the ABC™ (Advancing Blade Concept) rotor.