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면진시스템을 적용한 수직증축 리모델링 공동주택의 최적 면진주기 산정
허무원,이용훈,이상현 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 논문집 Vol.23 No.3
This study presents the optimal isolation period according to the number of vertically expended stories in order to provide the basic data for the application of the seismic isolation system in the vertically expended remodeling of the aged apartment. As a result of the structural analysis, the isolation period should be at least twice the primary structure in three-story vertical expansion, three times in two-story expansion, and four times in one-story expansion for the effective application of the isolation system. On the basis of the result, the efficacy of an isolation system for the actual apartment structure, which is three-story vertically expended, was analytically verified. The maximal acceleration response on the top floor reduced by 70% and 65% of the non-isolated structure in the X and Y directions respectively. Additionally, the base shear force decreased by 30% in the both directions, compared to the non-isolated structure. 본 연구에서는 노후화된 공동주택 수직 증축 리모델링 시 면진시스템의 적용성을 검토 및 면진시스템 적용을 위한 기초자료를 제공할 목적으로 동일한 구조로 수직 증축 시 수직 층수와 면진주기에 따른 최적 면진주기를 산정하였다. 해석결과, 3개층 수직 증축 시에는 면진주기를 비면진 건물 주기의 2배 이상, 2개층 수직 증축 시에는 비면진 건물 주기의 3배 이상을 확보하여야만 충분한 면진효과를 나타내는 것을 알 수 있었다. 또한, 1개층 수직 증축 시에는 비면진 건물 주기의 4배 이상을 확보하여야만 면진효과를 나타내었다. 위의 결과를 활용하여 3개층 수직증축 리모델링 대상 공동주택에 면진시스템을 적용하여 그 효과를 검증하였다. 최상층 최대응답가속도가 비면진 건물의 최대응답가속도 보다 X방향의 경우에는 약 70%로, Y방향의 경우에는 약 65%의 감소를 나타내었다. 또한, 밑면 전단력의 경우, 비면진 건물과 비교하여 X방향 및 Y방향 모두 약 30% 감소하는 것으로 나타났다.
김정윤(Jungyun Kim) 한국자동차공학회 2022 한국 자동차공학회논문집 Vol.30 No.5
This paper describes a method of obtaining the lateral load transfer ratio(LTR) that can determine the rollover safety of the vehicle by using wheel linear accelerations. An LTR, which is defined only by the vertical force of the wheels, can detect an instantaneous lateral load transfer, regardless of a sudden steering input while the vehicle is in motion. Thus, it is necessary to measure the vertical forces acting on each tire in real-time, though it is difficult to implement in practice. This paper proposes a novel approach to estimate the vertical forces by using wheel linear accelerations and a simplified vehicle dynamic model. The proposed vehicle dynamic model assumes only the rigidity of the vehicle body to convert wheel acceleration signals into the vertical forces on each tire in real-time. A signal processor and a digital filter were designed to convert the acceleration signal into the rectified vertical forces and LTR in real-time. Finally, the proposed method has been validated through road tests by using three-axis accelerometers and six-component, wheel force transducers mounted on the SUV.
심재수,최현규,김성민 한국도로학회 2011 한국도로학회논문집 Vol.13 No.3
This study was conducted to evaluate the characteristics of installation dimensions of speed control humps based on the theoretical dynamic analyses. The field surveys of speed control humps were performed first to compare their sizes with those suggested in the installation standard. Then, the displacement response spectra under impact loads were obtained using the single degree of freedom models where the vehicle and human were assumed to combine completely. The analysis results showed that the human perception became larger as the width and height of the humps increased, but the extremely higher uncomfortableness should be avoided. In addition, the ratio between the width and height should be considered when the humps are designed and installed because the ratio governs the vertical acceleration magnitude. 본 연구는 과속방지턱의 설치규격 특성을 검토하기 위하여 동역학적 이론을 기반으로 분석을 수행하였다. 먼저 과속방지턱에 대한 현장조사를 통해 기하구조 자료를 수집하여 현행 설치기준과 비교 분석하였으며, 차량과 운전자를 일체화시킨 단자유도 모델링 방법을 이용하여 충격하중에 의한 변위응답 스펙트럼을 구하였다. 해석 결과 과속방지턱의 폭과 높이는 커질수록운전자에게 미치는 심리적 부담감이 커지나 과도한 불편함을 초래하지 않도록 크기를 결정해야 하는 것으로 분석되었다. 또한과속방지턱의 폭과 높이의 비율은 운전자가 느끼는 수직가속도의 크기를 지배하므로 폭과 높이의 조화도 고려하여 과속방지턱을 설치하여야 한다.
정우철(Uh-Cheul Jeong),이창우(Chang-Woo Lee),한상천(Sang-Chun Han) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.5
This study investigated the sea trial performance of a wave piercing high speed planing hull (WPH). The bow shape of the boat is sharp, and it has no chine or spray strip like a normal planing boat. The skeg is attached to the bottom of the boat in the longitudinal direction from the bow to the stern. The speed performance was analyzed as the speed dropped in a wave, and the seakeeping performance was compared with that of a planing boat with a similar velocity coefficient by measuring the vertical acceleration of the bow in the wave. The turning circle was compared with Lewandowski"s estimation for a planing boat. As a result of this study, it was confirmed that the velocity drop of the developed WPH was not large in a wave, and the vertical acceleration was greatly reduced compared with that of a normal planing boat. The turning circle was somewhat larger than the estimated results for a planing boat, but the overall tendency was the same.
김재원(Jaewon Kim),하만수(Mansu Ha),김도균(Dogyun Kim),문정신(Jeongsin Mun),홍인호(Inho Hong),오재윤(Chaeyoun Oh) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.5-1
This paper proposes a method that can be used to derive the equation of motion of a haptic system via a simple experiment. In order to prove the reliability of the proposed method, a 1-dof haptic system is devised. An experiment is performed using a restoring force of the spring to generate a translational force to operate the handle of the haptic system. The translational velocity, translational acceleration, and vertical load are measured while the experiment is performed. Those three measured values are used to compute the three coefficients needed to compose the equation of the motion. Those three computed coefficients are not influenced by the operating distance of the handle. However, those are influenced by the vertical load transmitted via the handle. A relationship of the coefficients with the vertical load is proposed. The reliability of the proposed method is validated by comparing the measured translational forces with the translational forces estimated from the equation of motion derived using the method proposed in this paper.
전우훈(Woo Hoon Jeon),양인철(Inchul Yang),이진각(Jin Kak Lee),최건식(Gunsik Choi) 한국디지털콘텐츠학회 2021 한국디지털콘텐츠학회논문지 Vol.22 No.11
The purpose of this study is to see the usability of road digital contents from sensors. The main target of the usability is the design elements of speed bump with crosswalk (driving speed 30km/h, height 0.1m, width 4m), and we proposed the design elements for the road section with driving speed of more than 30km/h through simulation with collected data. For this purpose, the data for simulation calibration were collected, and simulations were performed for various design elements which includes driving speeds of 20km/h, 30km/h, 40km/h, heights of 0.075m, 0.1m, 0.125m, and widths of 4m, 6m, 8m. The simulation results show that the adequate width of speed bump with crosswalk is 4m when the driving speed is less than or equal to 30km/h, and it becomes more than 6m when the speed is more than 30km/h when it comes to both driving comfort and pedestrian safety.