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The Running Vibration Assessment of Daegu Metropolitan Transit using Smartphone Acceleration Sensor

스마트폰 가속도센서를 이용한 대구도시철도 주행진동평가

  • Kwon, Dong-Hee (Department of Civil Engineering, Keimyung University) ;
  • Jang, Sung-Hyun (Department of Civil Engineering, Keimyung University) ;
  • Mun, Hyung-Jin (Dept. of Information & Communication Engineering, Sungkyul University) ;
  • Chey, Min-Ho (Faculty of Architecture & Civil Engineering, Keimyung University)
  • 권동희 (계명대학교 토목공학과) ;
  • 장성현 (계명대학교 토목공학과) ;
  • 문형진 (성결대학교 정보통신공학부) ;
  • 최민호 (계명대학교 건축토목공학부)
  • Received : 2019.05.04
  • Accepted : 2019.06.20
  • Published : 2019.06.28

Abstract

Recently, various problems have arisen due to the popularization and aging of urban railway transit, which is the key transportation of large cities. In this study, the vibrational accelerations for the Daegu Metropolitan City Urban Railway(Line 1) were measured and evaluated using the smartphone built-in acceleration sensor and the approved application. For this purpose, the three axes running accelerations were measured according to the domestic standard (KS R 9160), and the acceleration data along the 32 stations (3 directions) were analyzed and compared. In addition, the increasing of acceleration values caused by the change of vibrational environment was monitored along the main stations between the time in 1997 and 2017. It was found that there are considerable increase of lateral and vertical directional accelerations due to the aging of railway facility environment for the last 20 years. The results of this study have valuable means for evaluating the ride quality of urban railway and the vibration influence on surrounding structures.

Keywords

Railway Transit;Smartphone;Vibrational Acceleration;Acceleration Sensor

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Fig. 1. Acceleration measurement axes

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Fig. 2. Double amplitude of acceleration

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Fig. 3. Train type[1]

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Fig. 4. Accelerometer detection points

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Fig. 5. Physics Toolbox Suite Pro[10]

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Fig. 6. Acceleration results through the 13th to 18th stations (3 axes)

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Fig. 7. Acceleration results of the one section (the 16th to 17th stations, 3 axes)

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Fig. 8. Acceleration properties in the years of 1997 and 2017 (Y-axis)

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Fig. 9. Acceleration properties in the years of 1997 and 2017 (Z-axis)

Table 1. Daegu metropolitan transit line 1 status[1]

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Table 2. Train function [1]

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