Study on ballast particle movement at different locations beneath crosstie using "smartrock"

Shushu Liu, Hai Huang, Tong Qiu, Yin Gao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Ballast compaction and particle rearrangement cause ballast to rotate and move vertically and horizontally. Ballast movement, including translation and rotation, has a significant effect on track performance. Large movement of ballast particles leads to track geometry roughness, e.g., hanging ties, and thus increases potential of damage and deterioration to rails, ties and fastening components. This study investigated ballast particle movement at different locations beneath a crosstie. In the paper, a wireless device - "SmartRock" was utilized to monitor ballast movement under cyclic loading in laboratory tests. The SmartRock has a shape of a realistic ballast particle. Inside the SmartRock was imbedded a tri-axial accelerometer, tri-axial gyroscope, and tri-axial magnetometer with 9 degrees of freedom so that particle translation, rotation and orientation can be interpreted, relatively. The real-time measurements were recorded by the SmartRock and then sent to a computer via Bluetooth. In the laboratory tests, a ballast box was constructed. In the ballast box, a half section of a typical railroad track was constructed. Five hundred cyclic load repetitions were applied on the top of the rail. Translational and rotational accelerations of the particle were recorded by the "SmartRock". Three ballast box tests were conducted. Two SmartRocks were placed beneath the middle of tie and the edge of tie, respectively but at different depths during each test - right under the tie, 12 cm beneath the tie and 25 cm beneath the tie. The results indicated that (1) ballast particles had translational as well as rotational modes under cyclic loading; (2) ballast particles had rotation together with horizontal translation; (3) particle rotation were higher beneath the edge of tie than those beneath the middle of tie; (4) Ballast movement were significantly reduced with depth. The paper also further confirmed that the SmartRock was capable of recording real-time translational and rotational accelerations, which would not have altered the motions of surrounding ballast particles due to its realistic shape of a particle, hence, provided a new means to monitor ballast particle movement in railroad engineering.

Original languageEnglish (US)
Title of host publication2016 Joint Rail Conference, JRC 2016
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791849675
DOIs
StatePublished - Jan 1 2016
Event2016 Joint Rail Conference, JRC 2016 - Columbia, United States
Duration: Apr 12 2016Apr 15 2016

Publication series

Name2016 Joint Rail Conference, JRC 2016

Other

Other2016 Joint Rail Conference, JRC 2016
CountryUnited States
CityColumbia
Period4/12/164/15/16

Fingerprint

railroad
Railroad engineering
Rails
Cyclic loads
Railroad tracks
Bluetooth
Gyroscopes
Degrees of freedom (mechanics)
Magnetometers
Time measurement
Accelerometers
Deterioration
recording
Compaction
damages
Surface roughness
mathematics
engineering
cause
Geometry

All Science Journal Classification (ASJC) codes

  • Transportation

Cite this

Liu, S., Huang, H., Qiu, T., & Gao, Y. (2016). Study on ballast particle movement at different locations beneath crosstie using "smartrock". In 2016 Joint Rail Conference, JRC 2016 (2016 Joint Rail Conference, JRC 2016). American Society of Mechanical Engineers. https://doi.org/10.1115/JRC2016-5749
Liu, Shushu ; Huang, Hai ; Qiu, Tong ; Gao, Yin. / Study on ballast particle movement at different locations beneath crosstie using "smartrock". 2016 Joint Rail Conference, JRC 2016. American Society of Mechanical Engineers, 2016. (2016 Joint Rail Conference, JRC 2016).
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Liu, S, Huang, H, Qiu, T & Gao, Y 2016, Study on ballast particle movement at different locations beneath crosstie using "smartrock". in 2016 Joint Rail Conference, JRC 2016. 2016 Joint Rail Conference, JRC 2016, American Society of Mechanical Engineers, 2016 Joint Rail Conference, JRC 2016, Columbia, United States, 4/12/16. https://doi.org/10.1115/JRC2016-5749

Study on ballast particle movement at different locations beneath crosstie using "smartrock". / Liu, Shushu; Huang, Hai; Qiu, Tong; Gao, Yin.

2016 Joint Rail Conference, JRC 2016. American Society of Mechanical Engineers, 2016. (2016 Joint Rail Conference, JRC 2016).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Liu S, Huang H, Qiu T, Gao Y. Study on ballast particle movement at different locations beneath crosstie using "smartrock". In 2016 Joint Rail Conference, JRC 2016. American Society of Mechanical Engineers. 2016. (2016 Joint Rail Conference, JRC 2016). https://doi.org/10.1115/JRC2016-5749