http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
윤도희(Do-hee Yoon),권성철(Seong-Cheol Kwon) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.6
In this study, a structural model was manufactured and a launch environment test was conducted to verify that the designed Electro-optical payload could withstand the launch environment. Two tests were conducted: random vibration test and shock test. In random vibration test, a notching was applied to prevent excessive dynamic loads on the structure by considering design load. Before and after conducting each test, a low-level sinusoidal sweep test was performed to confirm that there are no structural defects by examining the changes in the natural frequency and damping characteristics. Using this, the structural integrity of the Electro-optical payload for random vibration and shock tests could be verified. A limitation with the notching method, introduced in this paper, is that it is only applicable if the non-linearity of the structure can be ignored. However, there is a great advantage in terms of efficiency because this method can be applied without a prior structural analysis for notching.
윤도희(Do-hee Yoon),서종은(Jong-Eun Suh),한재흥(Jae-Hung Han),서중보(Joongbo Seo),송덕기(Deok Ki Song) 한국소음진동공학회 2018 한국소음진동공학회 논문집 Vol.28 No.4
In this paper, a vibration isolator using a viscoelastic material is proposed for reducing the micro-vibration in satellite platforms. In order to describe the vibration isolator, a mathematical model is derived in six degrees of freedom: three translational and three rotational motions. Then, the mathematical expressions of the force and moment transmissibility, which can evaluate the amount of reduction in micro-vibration through the vibration isolator, are established. The proposed mathematical model for vibration isolator is verified by comparing the transmissibility plots obtained from the mathematical model and the ANSYS results. Finally, the effect of the design parameters on the isolation performance is investigated using the mathematical model.