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Fabrication of the Three Dimensional Accelerometer using Bridge Combination Detection Method (브리지조합 검출방식을 이용한 고온용 3축 가속도센서 제작)

  • Son, Mi-Jung;Seo, Hee-Don
    • Journal of Sensor Science and Technology
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    • v.9 no.3
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    • pp.196-202
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    • 2000

  • In this paper, we proposed the new bridge combination detection method for three dimensional piezoresistive silicon accelerometer, and the accelerometer with SOI structures was fabricated by bulk micromachining technology for using higher temperature than $200^{\circ}C$. The sensitivities of fabricated accelerometer for X, Y and Z-axis acceleration were about 8mV/V G, 8mV/V G and 40mV/V G. The nonlinearity of the output voltage was 1.6%FS and cross-axis sensitivity was within 4.6%. We confirmed that the three bridges detection method is very simple and the output characteristics of this accelerometer were similar to arithmetic circuit method accelerometer. The temperature characteristics of SOI structure accelerometer showed high operating temperature and good stability. And the temperature coefficient of offset voltage and sensitivity were $1033ppm^{\circ}C^{-1}$ and $1145ppm^{\circ}C$ respectively.

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Analysis of Track-Bridge Interaction and Retrofit Design for Installation of CWR on Non-ballasted Railway Bridge (무도상 철도교 레일 장대화를 위한 궤도-교량 상호작용 해석 및 개량방안 분석)

  • Yoon, Jae Chan;Lee, Chang Jin;Jang, Seung Yup;Choi, Sang Hyun;Park, Sung Hyun;Jung, Hyuk Sang
    • Journal of The Korean Society For Urban Railway
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    • v.6 no.4
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    • pp.383-392
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    • 2018

  • This study investigated the change of additional axial stress of rail and reaction force at bridge bearings due to the track-bridge interaction when laying CWR on non-ballasted railway bridges including truss bridges with relatively long span. According to the results of the present study, additional axial stresses of rail and reaction forces at bridge bearings showed a large increase when CWR is installed on the non-ballasted railway bridge. The additional axial stress of rail can be acceptable if sufficient lateral resistance can be obtained. However, if the reaction force increases, there is a risk of damage of the bearing or pier, and therefore, it is necessary to take measures to mitigate the reaction force. It is found that additional axial stress of rail decreases when considering the frictional resistance of the bridge movable support, but its effect on the bearing reaction force is very small. On the other hand, when the longitudinal track restraint decreases, both additional axial stress of rail and bearing reaction force are reduced to a large extent. Also, when the ZLR fastening devices are applied to the region where the additional axial stress of rail is highest, bearing reaction force as well as additional axial stress of rail greatly decreased. Therefore, the application of ZLR fastening devices with the reduction of the longitudinal track restraints is very effective for installing CWR on non-ballasted railway bridges.

  • https://doi.org/10.24284/JKOSUR.2018.12.6.4.383 인용

Traffic Signal Control Methods for Functional Improvements in COSMOS (COSMOS 안정화를 위한 교통축 및 감응제어 방법연구)

  • 이승환;오영태;이상수
    • Journal of Korean Society of Transportation
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    • v.20 no.6
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    • pp.31-43
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    • 2002

  • Traffic signal control methods are suggested to improve the operational effectiveness of COSMOS system in Seoul. First. a method that improves progression of the corridor traffic flow within a common sub-area was explored. Applying this method, both frequency and magnitude of offset transition were reduced as compared to the existing method. In addition, the level of connection among neighboring corridors increased by applying the method, thus the qualify of progression was also improved. Second, a practical guideline on signal phase design was proposed to improve the efficiency of actuated operations for the left-turn movement. Last, a method for estimating optimal queue length parameters was surveyed and evaluated. An evaluation study was performed for the suggested methods through both field and simulation studies. Results showed that the proposed methods gave better performance than the existing methods. It is expected that the use of proposed methods can improve operational performance of COSMOS.

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