在不确定的参数下,EPB屏蔽道系统的RAM测量 - - 德黑兰地铁6号线的案例研究
Vahid Amini1, Jafar Khademi Hamidi1, Masoud Monjezi1
1Tarbiat Modares University, Tehran, Iran.
ISA transactions
|February 2, 2025
概括
执行因素显著降低了地球压力平衡 (EPB) 机器的可靠性. 分析子系统停机时间显示,运营决策可以将EPB机器的整体可靠性降低约40%.
科学领域:
- 土木工程 土木工程是指土木工程.
- 机械工程 机械工程
- 可靠性工程可靠性工程
背景情况:
- 道对于城市交通至关重要,需要高效的施工方法.
- 地球压力平衡 (EPB) 机器提供安全高效的道挖掘,但面临停机和维护方面的挑战.
- 减少EPB机器停机时间是主要研究重点.
研究的目的:
- 分析执行 (操作) 因素对EPB机器可靠性的影响.
- 区分直接 (技术) 和间接 (技术和执行) 的停机原因.
- 量化执行决策对机器整体性能的影响.
主要方法:
- 在12个月内收集了EPB机器16个子系统的停机时间数据.
- 将停机时间分为直接 (技术) 和间接 (技术和执行) 的因素.
- 应用统计测试 (趋势,序列相关性) 来分析故障间时间 (TBF) 和修复时间 (TTR) 数据.
- 通过更新过程和用于导航子系统TTR的非同质普森过程 (NHPP) 评估可靠性.
主要成果:
- 导航子系统对停机时间没有显著的执行影响.
- 大多数TBF和TTR子系统的数据都遵循更新过程,除了导航子系统的TTR (NHPP).
- 输送机和细分子系统在间接因素下具有关键性;输送机子系统在直接因素下具有关键性.
- 发现执行元件将EPB机器的可靠性降低约40%.
结论:
- 执行因素对EPB机器的可靠性有很大影响,而不是纯粹的技术问题.
- 识别和减轻执行决策的影响对于改善EPB机器正常运行时间和项目效率至关重要.
- 对运营管理的有针对性的改进可以大大提高道项目成功率.
更多相关视频
相关概念视频
01:09Bending of Material: Problem Solving
718
In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
718
01:27Series Impedances: Three-Phase Line
563
Calculating series impedances for a three-phase overhead line involves evaluating resistances and inductive reactances in a network with three-phase and multiple neutral conductors grounded at regular intervals.
Using Kirchhoff's laws, an integro-differential equation for the network is derived. This equation accounts for unbalanced phase currents, which may induce return currents through neutral wires and the earth, seeking the least impedance path. Earth return conductors can replace the...
Using Kirchhoff's laws, an integro-differential equation for the network is derived. This equation accounts for unbalanced phase currents, which may induce return currents through neutral wires and the earth, seeking the least impedance path. Earth return conductors can replace the...
563
01:24Bus Impedance Matrix
622
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
622