Prediction of Articulation Jack Strokes for Automatic Steering Control of a Shield TBM Using Machine Learning and Iterative Calculation

Soo-Ho Chang; Chulho Lee; Tae-Ho Kang; Soon-Wook Choi

doi:10.7474/TUS.2024.34.5.527

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2024 Vol.34, Issue 5 Preview Page Next Page

Original Article

Prediction of Articulation Jack Strokes for Automatic Steering Control of a Shield TBM Using Machine Learning and Iterative Calculation 쉴드 TBM의 자동 방향제어를 위한 머신러닝과 반복계산법에 의한 중절잭 추진 거리 예측

31 October 2024. pp. 527-542

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Abstract

A fundamental study was carried out on automatic steering control necessary for autonomous operation of shield TBMs in the future. It outlines and proposes theories and algorithms for predicting the strokes of articulation jacks used in a shield TBM and calculating the three-dimensional path coordinates of the shield TBM based on these predictions. To predict the strokes of articulation jacks, two methods were applied: a machine learning model based on the random forest regressor, and an iterative calculation method to satisfy a preset allowable error. For the iterative calculation, optimization methods were applied to reduce computation time. The mean and variance of the relative errors from the iterative calculation with allowable error were found to be relatively smaller than the predictions of the machine learning model. However, even with optimization methods applied, the iterative calculation method showed limitations in the allowable error that could be applied in terms of computation time. Therefore, it would be better to apply the machine learning model when real-time calculation speed is crucial. On the other hand, when pre-calculated results can be used during construction, the iterative calculation can be applied to achieve higher accuracy.

Keywords

Shield TBM

Steering

Articulation jack

Machine learning

Iteration

본 연구에서는 쉴드 TBM의 자율 운전을 위해 필요한 자동 방향제어에 대한 기초적인 연구로서, 쉴드 TBM에 사용되는 중절잭들의 추진 거리를 예측하고 이를 통해 쉴드 TBM의 3차원 경로 좌표를 계산할 수 있는 이론과 알고리즘을 정리하고 제시하였다. 중절잭들의 추진 거리를 예측하기 위하여 랜덤 포레스트 모델 기반의 머신러닝 모델과 설정된 허용 오차를 만족할 때까지 반복계산을 실시하는 방법을 적용하였다. 반복계산의 경우에는 계산시간을 단축하기 위한 최적화 방법들을 적용하였다. 허용오차를 제한하는 반복계산에 의한 상대오차의 평균과 분산이 머신러닝 모델의 예측결과보다 상대적으로 작게 나타났다. 그러나 반복계산의 경우에는 최적화 방법을 적용하더라도 계산시간 측면에서 적용할 수 있는 허용오차에 한계가 있는 것으로 나타났다. 따라서 실시간 계산속도가 중요한 경우에는 머신러닝 모델을 적용하는 것이 바람직하며, 사전에 계산된 결과를 활용할 수 있을 경우에는 반복계산법을 적용하여 정확도를 보다 높일 수 있을 것으로 판단된다.

키워드

쉴드 TBM

방향제어

중절잭

머신러닝

반복계산

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Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 34
No :5
Pages :527-542
Received Date : 2024-10-07
Revised Date : 2024-10-14
Accepted Date : 2024-10-14
DOI :https://doi.org/10.7474/TUS.2024.34.5.527

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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