A numerical calculation method of environmental impacts for the deep sea mining industry – a review

2018 ◽  
Vol 20 (3) ◽  
pp. 454-468
Author(s):  
Wenbin Ma ◽  
Cees van Rhee ◽  
Dingena Schott
Keyword(s):  
Numerical Calculation ◽  
Environmental Impacts ◽  
Calculation Method ◽  
Deep Sea ◽  
Mining Industry ◽  
Mineral Resources ◽  
Gradual Decrease ◽  
The World ◽  
Numerical Calculation Method

Since the gradual decrease of mineral resources on-land, deep sea mining (DSM) is becoming an urgent and important emerging activity in the world.

scholarly journals Study on the Non-Steady-State Wear Characteristics and Test of the Flow Passage Components of Deep-Sea Mining Pumps

2022 ◽  
Vol 12 (2) ◽  
pp. 782
Author(s):  
Shunjun Hong ◽  
Xiaozhou Hu
Keyword(s):  
Steady State ◽  
Numerical Calculation ◽  
Calculation Method ◽  
Deep Sea ◽  
Coarse Grained ◽  
Surface Wear ◽  
Wear Area ◽  
Flow Passage ◽  
Wear Characteristics ◽  
Numerical Calculation Method

In the process of conveying coarse-grained minerals, the internal flow-through passage components of mining pumps are subject to wear. The flow of coarse particles in such pumps is complex and changes constantly, making it necessary to study the non-steady-state wear characteristics and test the flow passage components. The evolution of the surface wear rate for the flow passage components during one third of a rotation cycle (120°) of a mining pump impeller with small, design, and large flow rates was analyzed in this study based on a discrete phase model (DPM). The flow that occurs during an entire rotation cycle of the impeller was investigated. The wear test was carried out with a small test pump with the same specific speed as and a similar structure to that of the deep-sea mining pump. The test results were compared with the numerical calculation results of the deep-sea mining pump obtained by using the same numerical calculation method and wear model, and the test wear area was found to be more consistent with the numerical calculation wear area. The results show that the numerical calculation method used in this article can more accurately predict the surface wear of the passage components of the mining pump and provides a suitable method for the prediction of the wear characteristics of the mining pump.

Determination Method of Elasto-Plastic Correction Factor of TA16 Titanium Alloy Based On RCC-M Code Methodology

2021 ◽  
Author(s):  
Xuejiao Shao ◽  
Juan Du ◽  
Liping Zhang ◽  
Hai Xie ◽  
Jun Tian ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Numerical Calculation ◽  
Austenitic Stainless Steel ◽  
Constitutive Model ◽  
Correlation Coefficient ◽  
Correction Factor ◽  
Calculation Method ◽  
Plastic Correction ◽  
Numerical Calculation Method

Abstract In the code for nuclear equipment, the elasto-plastic correction factor KE is a correction factor when the stress range exceeds the yield limit for simplified elasto-plastic fatigue analysis. The parameters and expressions of KE for commonly used materials (such as austenitic stainless steel) are given in the RCC-M and ASME code, but the parameters of KE for titanium alloy materials is lacking. Based on the cyclic elasto-plastic constitutive model of Z2CND18.12 (nitrogen control) and KE parameters of austenitic stainless steel given in the code, considering various sensitive factors, a numerical calculation method for determining KE correlation coefficient is established. The elasto-plastic constitutive model of TA16 alloy with nonlinear kinematic hardening was established by the uniaxial tension, strain and stress cycling tests of TA16 titanium alloy. Based on the numerical calculation method of KE and the constitutive model of TA16 titanium alloy, the expression and correlation coefficient of KE for TA16 titanium alloy were determined.

Precise grading of surrounding rock based on the numerical calculation of the jointed rock mass

2022 ◽  
pp. 1-32
Author(s):  
Dan Huang ◽  
Xiao-Qing Li ◽  
Wen-Chao Song
Keyword(s):  
Rock Mass ◽  
Numerical Calculation ◽  
Calculation Method ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Surrounding Rock ◽  
Geological Survey ◽  
Survey Method ◽  
Synthetic Rock ◽  
Numerical Calculation Method

In this study, grading of surrounding rock was based on rock mass basic quality (BQ) values according to the specifications in China. Numerical approach was to construct synthetic rock mass (SRM) model to represent the jointed rock mass, and obtain the strength of the rock mass. It represented intact rock by the bonded particle model (BPM), and represent joint behaviour by the smooth joint model (SJM) to construct the discrete fracture network (DFN). In the Hongtuzhang Tunnel, the micro properties of granite cores with different weathered degrees were determined by the validation process, and the calculation representative elementary volume (REV) of surrounding rock was 15 m×15 m. Five slightly weathered, three slightly to moderately weathered, and two moderately weathered granite surrounding rock mass models were established based on the probability distribution of joint sets in each borehole, the conversion BQ value was acquired according by the calculated strength of rock mass model. It was discussed the differences of surrounding rock grades between the geological survey method and the numerical calculation method, and then found that the geological survey report is higher than the numerical calculation method predicted. And the numerical calculation is consistent with the actual excavation of rock mass at borehole A1388.

scholarly journals Simple numerical calculation method of flow velocity on roof of train running in tunnel

2018 ◽  
Vol 5 (3) ◽  
pp. 17-00545-17-00545 ◽  
Author(s):  
Katsuhiro KIKUCHI ◽  
Yuhei NOGUCHI ◽  
Koji NAKADE ◽  
Shinya MASHIMO
Keyword(s):  
Numerical Calculation ◽  
Flow Velocity ◽  
Calculation Method ◽  
Numerical Calculation Method

Numerical calculation method of inter-strand coupling current losses in superconducting conductors

Cryogenics ◽  
1989 ◽  
Vol 29 (7) ◽  
pp. 741-747 ◽  
Author(s):  
F. Sumiyoshi ◽  
H. Kasahara ◽  
T. Kawashima ◽  
T. Tanaka
Keyword(s):  
Numerical Calculation ◽  
Calculation Method ◽  
Numerical Calculation Method ◽  
Coupling Current

A modified numerical calculation method of collapse pressure for thick-walled offshore pipelines

2019 ◽  
Vol 91 ◽  
pp. 101884
Author(s):  
Jian-xing Yu ◽  
Meng-xue Han ◽  
Jing-hui Duan ◽  
Yang Yu ◽  
Zhen-zhou Sun
Keyword(s):  
Numerical Calculation ◽  
Calculation Method ◽  
Offshore Pipelines ◽  
Collapse Pressure ◽  
Numerical Calculation Method
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