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외부장착물이 있는 항공기 날개의 플러터 특성 및 능동 진동 제어
강래형,이승준,이인,한재흥,Kang, Lae-Hyong,Lee, Seung-Jun,Lee, In,Han, Jae-Hung 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.4
Modern aircraft are required to carry various external stores mounted at different locations on the wing. Sometimes the attachment of stores to an aircraft wing leads to flutter speed reduction, which is a very severe aeroelastic problem. In order to suppress structural vibration and expand the flutter boundary of the aircraft with stores, it is necessary to investigate the main problems and characteristics of them. In addition, active vibration control may be required because passive vibration isolators show limited capabilities for the various wing/store configuration. In this paper, therefore, the flutter stability to the various wing/store configurations was investigated and active vibration control of wing/store model was performed using a piezoelectric actuator.
강래형(Kang, Lae-Hyong),김대관(Kim, Dae-Kwan),한재흥(Han, Jae-Hung) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.12
In this study, structural deformation estimation using displacement-strain relationship is investigated. When displacements of a structure cannot be measured directly, estimation of displacements using strain data can be an alternative solution. Additionally, the deformation of the whole structure as well as the displacement at the point of interest can be estimated. Strain signals are obtained front Fiber Bragg Grating(FBG) sensors that have an excellent multiplexing ability. Some experiments were performed on two beams and a plate to which FBG sensors were attached in the laboratory. Strain signals from FBG sensors along a single strand of optical fiber were obtained through wavelength division multiplexing(WDM) method. The beams and the plate structures were subjected to various loading conditions, and deformed shapes were reconstructed from the displacement-strain transformation relationship. The results show good agreements with those measured directly from laser sensors. Moreover, the whole structural shapes of the beams and the plate were estimated using only some strain sensors.
초기응력을 가진 기저구조물을 이용한 곡면형 압전 유니모프 개발
강래형(Kang, Lae-Hyong),이종원(Lee, Jong-Won),한재흥(Han, Jae-Hung),정상준(Chung, Sang-Joon),고한영(Ko, Han-Young) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.1
This paper proposes a novel curved shape piezoelectric unimorph using a new fabrication method. Instead of using thermal coefficient mismatch, which has been used for conventional processes for curved shape unimorphs, we used pre-stressed substrates and the room temperature adhesion process. A difference of the mechanical strains between the substrate and the piezoelectric layer makes the final manufactured unimorph get curved. Several performance tests of the proposed unimorph actuators were accomplished and the test results showed the proposed unimorph actuator got comparable actuation capability compared with conventional curved shape actuators.