scholarly journals Performance Evaluation of Hard Rock TBMs considering Operational and Rock Conditions

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Xiaoyang Zou ◽  
Hui Zheng ◽  
Yongzhen Mi
Keyword(s):  
Energy Efficiency ◽  
Performance Evaluation ◽  
Wear Rate ◽  
Hard Rock ◽  
Vibration Measurement ◽  
Disc Cutter ◽  
Vibration Level ◽  
Operational Parameters ◽  
Tbm Performance ◽  
Cutter Wear

This paper focuses on studying the correlations of the performance of hard rock tunnel boring machines (TBMs) with operational and rock conditions. Firstly, a rigid-flexible coupled multibody dynamic model of an opening hard rock TBM is established for the analysis of its vibration. Then four performance indexes including mean vibration energy dissipation rate, dynamic specific energy (DSE), disc cutter wear rate, and load sharing coefficient are introduced and formulated, respectively, for evaluating the vibration level, excavation energy efficiency, cutter’s vulnerability to wear, and load transmission performance of cutterhead driving system of the TBM. Finally, numerical simulation results of the TBM tunneling performance evaluation are obtained and validated by on-site vibration measurement and tunneling data collection. It is found that operational and rock conditions exert important impact on TBM vibration level, excavation energy efficiency, and structure damage. When the type of rock to be cut changes from soft to hard with operational parameters held constant, TBM performance evaluated by these three indexes deteriorates significantly, and both the decrease of excavation energy efficiency and the increase of cutter wear rate caused by TBM vibration are obvious. This study provides the foundation for a more comprehensive evaluation of TBM performance in actual tunneling process.

TBM performance and disc cutter wear prediction based on ten years experience of TBM tunnelling in Iran

2015 ◽  
Vol 8 (3) ◽  
pp. 239-247 ◽  
Author(s):  
Jafar Hassanpour ◽  
Jamal Rostami ◽  
Jian Zhao ◽  
Sadegh Tarigh Azali
Keyword(s):  
Disc Cutter ◽  
Wear Prediction ◽  
Tbm Performance ◽  
Cutter Wear ◽  
Disc Cutter Wear

The energy method to predict disc cutter wear extent for hard rock TBMs

2012 ◽  
Vol 28 ◽  
pp. 183-191 ◽  
Author(s):  
Lihui Wang ◽  
Yilan Kang ◽  
Zongxi Cai ◽  
Qian Zhang ◽  
Yu Zhao ◽  
...  
Keyword(s):  
Energy Method ◽  
Hard Rock ◽  
Disc Cutter ◽  
Cutter Wear ◽  
Disc Cutter Wear

Analysis and prediction of TBM disc cutter wear when tunneling in hard rock strata: A case study of a metro tunnel excavation in Shenzhen, China

Wear ◽  
2020 ◽  
Vol 446-447 ◽  
pp. 203190 ◽  
Author(s):  
Weilin Su ◽  
Xinggao Li ◽  
Dalong Jin ◽  
Yi Yang ◽  
Ruicheng Qin ◽  
...  
Keyword(s):  
Hard Rock ◽  
Disc Cutter ◽  
Tunnel Excavation ◽  
Cutter Wear ◽  
Metro Tunnel ◽  
Disc Cutter Wear ◽  
Rock Strata

scholarly journals DISC CUTTER WEAR AND SECONDARY FRAGMENTATION IN HARD ROCK TBM TUNNELING

2009 ◽  
Vol 65 (4) ◽  
pp. 951-962
Author(s):  
Yu KOIZUMI ◽  
Kimikazu TSUSAKA ◽  
Chikaosa TANIMOTO ◽  
Yasuyuki MIYAJIMA
Keyword(s):  
Hard Rock ◽  
Disc Cutter ◽  
Secondary Fragmentation ◽  
Cutter Wear ◽  
Hard Rock Tbm ◽  
Disc Cutter Wear

scholarly journals Energy and Exergy Efficiency Analysis of Fluid Flow and Heat Transfer in Sinter Vertical Cooler

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4522
Author(s):  
Zude Cheng ◽  
Haitao Wang ◽  
Junsheng Feng ◽  
Yongfang Xia ◽  
Hui Dong
Keyword(s):  
Heat Transfer ◽  
Energy Efficiency ◽  
Fluid Flow ◽  
Waste Heat ◽  
Exergy Efficiency ◽  
Inlet Temperature ◽  
Operational Parameters ◽  
Flow And Heat Transfer ◽  
Maximum Value ◽  
Energy And Exergy

In order to fully understand the energy and exergy transfer processes in sinter vertical coolers, a simulation model of the fluid flow and heat transfer in a vertical cooler was established, and energy and exergy efficiency analyses of the gas–solid heat transfer in a vertical cooler were conducted in detail. Based on the calculation method of the whole working condition, the suitable operational parameters of the vertical cooler were obtained by setting the net exergy efficiency in the vertical cooler as the indicator function. The results show that both the quantity of sinter waste heat recovery (SWHR) and energy efficiency increased as the air flow rate (AFR) increased, and they decreased as the air inlet temperature (AIT) increased. The increase in the sinter inlet temperature (SIT) resulted in an increase in the quantity of SWHR and a decrease in energy efficiency. The air net exergy had the maximum value as the AFR increased, and it only increased monotonically as the SIT and AIT increased. The net exergy efficiency reached the maximum value as the AFR and AIT increased, and the increase in the SIT only resulted in a decrease in the net exergy efficiency. When the sinter annual production of a 360 m2 sintering machine was taken as the processing capacity of the vertical cooler, the suitable operational parameters of the vertical cooler were 190 kg/s for the AFR, and 353 K for the AIT.

scholarly journals Dimensionless Analysis on the Characteristics of Pneumatic Booster Valve with Energy Recovery

2016 ◽  
Vol 2016 ◽  
pp. 1-13
Author(s):  
Fan Yang ◽  
Kotaro Tadano ◽  
Gangyan Li ◽  
Toshiharu Kagawa
Keyword(s):  
Mathematical Model ◽  
Energy Efficiency ◽  
Energy Recovery ◽  
Operational Parameters ◽  
Local Pressure ◽  
Air Power ◽  
Improve Energy Efficiency ◽  
Dimensionless Analysis ◽  
Air Supply ◽  
Save Energy

Factories are increasingly reducing their air supply pressures in order to save energy. Hence, there is a growing demand for pneumatic booster valves to overcome the local pressure deficits in modern pneumatic systems. To further improve energy efficiency, a new type of booster valve with energy recovery (BVER) is proposed. The BVER principle is presented in detail, and a dimensionless mathematical model is established based on flow rate, gas state, and energy conservation. The mathematics model was transformed into a dimensionless model by accurately selecting the reference values. Subsequently the dimensionless characteristics of BVER were found. BVER energy efficiency is calculated based on air power. The boost ratio is found to be mainly affected by the operational parameters. Among the structural ones, the recovery/boost chamber area ratio and the sonic conductance of the chambers are the most influential. The boost ratio improves by 15%–25% compared to that of a booster valve without an energy recovery chamber. The efficiency increases by 5%–10% depending on the supply pressure. A mathematical model is validated by experiment, and this research provides a reference for booster valve optimisation and energy saving.

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