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등가 대기 속도를 활용한 돌풍 하중에 따른 무인 항공기 고소작업대의 구조물 안전성 해석
류현기(Hyeon-Gi Ryu),손동훈(Dong-Hun Son),김준(Joon Kim),이동근(Dong-Geun Lee),박경수(Kyoung-Su Park) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.5
Structural stability analysis of a high maintenance lift mounting an unmanned aerial vehicle (UAV) like a scissor lift was carried out. The dynamic test of UAV requires the maintenance lift. However, while the dynamic test was being carried out, a gust load in the form of random wind force and normal wind force could affect the dynamics and stability of the maintenance lift. Moreover, the gust load can have a frequency effect (0 Hz ~5 Hz), and it can damage the safety of the maintenance lift and the UAV. Therefore, we constructed the symmetric four cables in order to prevent the destruction of the UAV test system by the rotating moments induced by the wind behavior. Based on the simulation results, we found that the yield strength of the steel cable with a diameter of 10 mm was sufficient to bear the rotating load considering the safety factor of 3, but the cable connection point between the cable and ground was adversely affected. Therefore, we additionally analyzed the rope tension and computed reaction forces at connection points to propose the optimal connection force with safety factor of 3.
박승호(Seung-Ho Park),류현기(Hyeon-Gi Ryu),이창민(Chang-Min Lee),김상현(Sang-Hyun Kim),정회인(Hoe-In Jeong),박경수(Kyoung-Su Park) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.6
A wireless data logging system connected with accelerometer was developed for measuring vibration in harsh environment where conventional vibration equipment could not be used, e.g., on deck of the battleship, surface of the submarine or airplane, etc. To minimize wired connections, the module used a battery to supply power, and the data was recorded by the module itself on the SD card. Data logging was carried out through Arduino. Because the voltage levels of the accelerometers were different, the internal circuits were adjusted by changing the voltage levels through level shifting. Data logging was optimized using the hardware interrupt and double buffering to maintain a constant sampling rate during data logging and to prevent loss of data. The vibration data obtained through the manufactured module was compared with data measured by LMS test to confirm the validity of the signal. It was also confirmed that the module measurement data was normal even during long-time measurements.