Journal of The Korean Society for Aeronautical & Space Sciences 

About: Journal of The Korean Society for Aeronautical & Space Sciences is an academic journal published by Korean Society for Aeronautical and Space Science. The journal publishes majorly in the area(s): Aerodynamics & Airfoil. It has an ISSN identifier of 1225-1348. Over the lifetime, 2671 publications have been published receiving 4137 citations. The journal is also known as: Journal of the Korean society for aeronautical and space sciences & Journal of the Korean Society for Aeronautical and Space Sciences.

Design of Missile Guidance Law via Variable Structure Control

Abstract: New missile guidance law is proposed via variable structure control. The acceleration command is determined considering the target acceleration information as uncertainty. Target and missile are assumed to be point masses moving in the two dimensional plane. According to the property of the missile acceleration command, the proposed guidance laws are classified into IPN type and RTPN type. Moreover, it is shown that the conventional proportional guidance laws can be derived from the proposed guidance law. Numerical simulation results show that the proposed guidance law exhibits better performance compared to the conventional proportional guidance laws.

Analysis on Optimality of Proportional Navigation Based on Nonlinear Formulation

Abstract: "OBMZTJT PO PQUJNBMJUZ PG UIF QS PQPSUJPOBM OBWJHBUJPO HVJEBODF 1/( MBX JTQSFTFOUFE JO UIJT QBQFS 8IJMF NPTU PG QSFWJPVT TUVEJFT PO PQUJNBMJUZ PG 1/( XFSFSFMJFEPOUIFMJOFBSGPSNVMBUJPOUIJTQBQFSJTCBTFEPOUIFOPOMJOFBS GPSNVMBUJPO 5IFBOBMZTJT TIPXT UIBU 1/( JT BO PQUJNBM TPMVUJPO NJOJNJ[JOH B SBO HFXFJHIUFE DPOUSPMFOFSHZ XIFSF UIF XFJHIUJOH GVODUJPOJTBOJOWFSTFPG7 QPXFS PG UIFEJTUBODFUPUBSHFU 8F TIPX UIBU UIF OBWJHBUJPO DPOTUBOU § JT SFMBUFE UP 7 EJSFDUMZ"OE BMTP UIF DPOEJUJPOT SFRVJSFE UP FOTVSF UIF BOBMZTJT SFTVMU BSF JOWFTUJHBUFE

Integrated Guidance and Control Law with Impact Angle Constraint

Abstract: The concept of the IGC(Integrated Guidance and Control) has been introduced to overcome the performance limit of the SGC(Separated Guidance and Control) loop. A new type of IGC with impact angle constraint has been proposed in this paper. Angle of attack, pitch angle rate, pitch angle and line of sight angle are considered as state variables. A controllability analysis and equilibrium point analysis have been carried out to investigate the control characteristic of the prposed IGC. The LQR(Linear Quadratic Regulator) has been adopted for the control law and detailed explanations about the adoption has been provided. The performance comparison between the IGC and the SGC has been carried out. The result of numerical simulations shows that the IGC guarantees better guidance performance than the SGC when the agile maneuver is needed for a specific guidance geometry.

Postbuckling of Composite Cylinders under External Hydrostatic Pressure

Abstract: The postbuckling behavior and failure of composite cylinders subjected to external hydrostatic pressure are investigated by a finite element method and test. A nonlinear finite element program, ACOS, is used for the postbuckling progressive failure analysis of composite cylinders. A total of 5 carbon/epoxy composite cylinders were fabricated and tested to verify the finite element results. For comparison, analyses by MSC/NASTRAN and MSC/MARC are additionally conducted. Among the softwares, the finite element program, ACOS, predicts the buckling loads the best with about 11 to 26% deviation from experimental results except for one specimen. While the finite element analysis shows global buckling modes with 4 waves in hoop direction, in the experiments the local buckling appears first and results in the final failure without global buckling.Ȁ耀Ѐ€