Shock Response Analysis of a Simple Structure Using Statistical Energy Analysis and Virtual Mode Synthesis and Simulation

본 연구는 다목적실용위성 5 호 시스템종합개발사업과 두뇌한국(BK)21 사업에 의해 지원되었으며 이에 감사 드립니다

Development of Multi-DOF Active Microvibration EmulatorMICROVIBRATION EMULATOR, TEST DEVICE OF SATELLITE SYSTEM INCLUDING THE SAME, AND METHOD OF EMULATING MICROVIBRATION

미소진동 에뮬레이터는 플랫폼(platform), 제1 내지 제6 작동기(actuator)들 및 제1 내지 제6 구조물들을 포함한다. 플랫폼은 정육면체 형상을 가진다. 제1 내지 제6 작동기들은 플랫폼의 제1 내지 제6 면에 각각 부착되며, 구동 신호에 기초하여 플랫폼을 미소진동시키고 플랫폼에 대한 6축 제어를 수행한다. 제1 내지 제6 구조물들은 제1 내지 제6 작동기들에 각각 부착된다

저궤도 지구관측위성 발사체 분리 시 충격응답 해석

본 연구는 다목적실용위성 5호 시스템종합개발사업과 두뇌한국(BK)21 사업에 의해 지원되었으며 이에 감사드립니다

통계적 에너지 해석 기법과 가상 모드 합성 기법을 활용한 저궤도 지구관측위성의 음향-진동 및 충격 응답 해석

학위논문(석사) - 한국과학기술원 : 항공우주공학전공, 2010.08, [ viii, 105 p. ]Typically, the most severe high frequency dynamic environments encountered by spacecrafts are high intensity acoustic field generated during launch and shock induced by the activation of pyrotechnic devices during launch vehicle separation. Analysis of spacecrafts’ response to these high frequency loads is important for optimal design and to guarantee performance of flight hardware, electronic equipments, etc that are vulnerable to failure under such loads. Unfortunately, the conventional deterministic methods (finite and boundary element method) become inefficient and less useful as analysis frequency increases due to the intrinsic feature of wave dynamics and unavoidable uncertainties concerning dynamic properties of complex structures. Alternative probabilistic method called the statistical energy analysis (SEA) has proven itself as a reliable tool for high frequency vibroacoustic analysis. Although SEA is limited to steady-state response analysis, virtual mode synthesis and simulation (VMSS) can be adapted with SEA for high frequency transient response analysis. In this study, vibroacoustic analysis of a low altitude earth observation satellite under high intensity acoustic field is performed using SEA with experimentally determined SEA parameters. VMSS is then applied in conjunction with SEA for launch vehicle separation shock analysis of the satellite. The prediction results show good agreement with the experimental results over the frequency range of interest.한국과학기술원 : 항공우주공학전공