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http://dx.doi.org/10.5139/JKSAS.2006.34.4.025

A Study on Phugoid Mode in Longitudinal Axis of T-50  

Kim, Jong-Seop (한국항공우주산업)
Hwang, Byeong-Mun (전북대학교)
Kim, Seong-Jun (한국공군)
Heo, Gi-Bong (국방과학연구소)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.34, no.4, 2006 , pp. 25-32 More about this Journal
Abstract
An advanced method of Relaxed Static Stability (RSS) is utilized for improving the aerodynamic performance of modern version supersonic jet fighter aircraft. The flight control system utilize RSS criteria in both longitudinal and lateral-directional axes to achieve performance enhancements and improve stability. The T-50 advanced trainer employs the RSS concept in order to improve the aerodynamic performance and the flight control law in order to guarantee aircraft stability. The longitudinal two modes are the short period with high frequency and the phugoid mode with low frequency. The design goals of longitudinal control laws is concerned with the short period damping and frequency optimization using lower order equivalent system and utilizing the requirement of MIL-F-8785C. Analysis of short period mode has been and continues to be performed This paper addresses the analysis of aircraft phugoid node characteristics such as damping, natural frequency, and analysis of aircraft pitch motion that impacted by angle of attack limiter and auto pitch attitude control law.
Keywords
Phugiod Mode; RSS(Relaxed Static Stability);
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