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http://dx.doi.org/10.5139/JKSAS.2018.46.2.106

A Study on Prediction of Acoustic Loads of Launch Vehicle Using NURBS Curve Modeling  

Park, Seoryong (Seoul National University)
Kim, Hongil (Agency for Defense Development)
Lee, Soogab (Seoul National University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.46, no.2, 2018 , pp. 106-113 More about this Journal
Abstract
The Intense acoustic wave generated by the jet flame at the lift-off causes the vehicle to vibrate in the form of acoustic loads. The DSM-II(Distributing Source Method-II), which is a representative empirical acoustic loads prediction method, is a method of distributing a noise source along a jet flame axis and has advantages in calculation cost and accuracy. However, due to the limitation of the distributing method, there is a limit to accurately reflect the various launch pad configurations. In this study, acoustic loads prediction method which can freely distribute noise sources is studied. by introducing NURBS(Non-Uniform Rational B-Spline) modeling into empirical prediction method. For the verification of the newly introduced analytical technique of the NURBS, the acoustic loads prediction for the Epsilon rocket's low-noise launch pad shape was performed and the results of the analysis were compared with the existing prediction methods and experimental results.
Keywords
Launch Vehicle; Acoustic Loads; Empirical Prediction Method; Distributing Source Method; Low Noise Launch Pad; NURBS Curve Modeling;
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