Application of the strain energy ratio and the equivalent thrust per cutter to predict the penetration rate of TBM, case study: Karaj-Tehran water conveyance tunnel of Iran

2014 ◽  
Vol 8 (7) ◽  
pp. 4833-4842 ◽  
Author(s):  
M. Soleiman Dehkordi ◽  
H. A. Lazemi ◽  
K. Shahriar
Keyword(s):  
Strain Energy ◽  
Penetration Rate ◽  
Energy Ratio ◽  
Water Conveyance ◽  
Equivalent Thrust Per Cutter ◽  
Penetration Rate Of Tbm ◽  
Water Conveyance Tunnel ◽  
Strain Energy Ratio

Analysis on vibration energy concentration of the one-dimensional wedge-shaped acoustic black hole structure

2018 ◽  
Vol 29 (10) ◽  
pp. 2137-2148 ◽  
Author(s):  
Xi Li ◽  
Qian Ding
Keyword(s):  
Black Hole ◽  
Strain Energy ◽  
Energy Ratio ◽  
Energy Concentration ◽  
Vibration Energy ◽  
Maximum Height ◽  
The One ◽  
Hole Structure ◽  
Hole Effect ◽  
Strain Energy Ratio

The transverse vibration energy of a plate with a wedge-shaped profile can be trapped by acoustic black hole effect to its edge portion, in case the wedge thickness is diminished according to the power-law h( x) =  εxm with m ≥ 2.0. The acoustic black hole effect exhibits potential ability for passive vibration control and energy harvesting. In this article, the transfer matrix method is adopted to establish and solve the dynamical model of acoustic black hole structure. Energy ratio is defined as a ratio of the energy trapped within the edge portion to that of the whole wedge, to illustrate the energy concentration effect. Analyses show that both the strain energy ratio and kinetic energy ratio of the acoustic black hole structure achieve the minimum when the wedge is in resonances, although these two kinds of energy come to peaks at this case. However, in the case of small length of the edge portion, the strain energy ratio reaches the highest peaks at the second and higher resonances, rather than at the first one. Generally, the best effect of energy concentration occurs when m ranges from 2.5 to 3.0. Reducing the truncation thickness and increasing the maximum height can improve the energy trapping.

Support system suggestion based on back-analysis results case study: Babolak water conveyance tunnel

2011 ◽  
Vol 5 (6) ◽  
pp. 1297-1306 ◽  
Author(s):  
Ehsan Dadashi ◽  
Kaveh Ahangari ◽  
Ali Noorzad ◽  
Alireza Arab
Keyword(s):  
Support System ◽  
Back Analysis ◽  
Water Conveyance ◽  
Water Conveyance Tunnel
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