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임규백(KyuBaek Lim),기영중(Youngjung Kee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In this paper, dynamic simulations of the blade specimens required for the fatigue test of the composite rotor blades applied to a rotorcraft and the corresponding test load conditions are introduced. The shape of the blade specimen is divided into Attachment part and Airfoil part according to test load application method and fatigue life evaluation position. Fatigue test conditions are realized by centrifugal force and a predetermined ratio of flap and lag moment load. Therefore, the fatigue test simulation based on the finite element analysis is performed to confirm the test conditions to apply the target load to the blade test section. The fatigue test simulation results for both methods using the resonance phenomenon or the bearing support are used to verify the test load condition.
헬리콥터 로터 소음 저감을 위한 능동거니플랩의 동해석 및 회전시험 시뮬레이션
기영중(Kee YoungJung),임규백(Lim KyuBaek),김덕관(Kim DeogKwan) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Dynamic behavior of AGF(Active Gurney Flap) for BVI(Blade Vortex Interaction) noise reduction of a helicopter rotor system was investigated. In addition, in order to simulate the rotational test of the AGF, a model-scale rotor system was considered; which is 2-bladed hingeless rotor with 2.3m diameter and NACA23012 airfoil. The Gurney flap is a kind of small flat plate, mounted normal to the lower surface of the blade near to the trailing edge. An electric motor, L-shaped linkages and flap parts were integrated into a dummy blade. The AGF and rotor system was modeled using Midas-NFX; which is the commercial FEA code. The natural frequencies and mode shapes of a model-scale rotor system were calculated, then the dynamic displacement of the AGF with considering both the centrifugal force and active control input was investigated. The analysis results showed that the 4㎜ dynamic stroke requirement of the AGF
Optimal Design of Flexbeam Cross-Sections using Particle Swarm Assisted Genetic Algorithm
Manoj Kumar Dhadwal,Kyubaek Lim,Sung Nam Jung,Tae Joo Kim 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
This paper presents the optimal design of flexbeam cross-sections for a full-scale bearingless helicopter. A hybrid optimization algorithm based on the particle swarm optimization and real-coded genetic algorithm is used combined with an effective constraint handling scheme. A new rank-based crossover is developed for the real-coded genetic algorithm based on the mutation operator of differential evolution and heuristic crossover. The suggested crossover operator improves both the efficiency as well as the global exploration of the solutions. The particle swarm optimization is then hybridized with the improved genetic algorithm. Euclidean-distance based niching is implemented in the genetic algorithm to maintain the population diversity. The developed algorithm is used for the design of two configurations of the flexbeam cross-section. The optimal results are obtained within very few function evaluations and less CPU time.