Gas drainage efficiency improvement by increasing coalbed permeability using waterjet cutting system

2010 ◽  
Vol 16 (2) ◽  
pp. 150-156 ◽  
Author(s):  
Ting-kan Lu ◽  
Ting-yang Zhou ◽  
Hong Yu
Keyword(s):  
Efficiency Improvement ◽  
Gas Drainage ◽  
Waterjet Cutting ◽  
Cutting System

scholarly journals Dynamic Modelling and Identification of a Waterjet Cutting System

2003 ◽  
Author(s):  
Brian C. Fabien ◽  
M. Ramulu
Keyword(s):  
Dynamic Model ◽  
High Pressures ◽  
Dynamic Modelling ◽  
Check Valve ◽  
Differential Algebraic Equations ◽  
Algebraic Equations ◽  
Unknown Parameters ◽  
Actual System ◽  
Waterjet Cutting ◽  
Cutting System

This paper describes a new dynamic model for a waterjet cutting system that includes a double-acting reciprocating intensifier pump. Since the system operates at high pressures the fluid flow is assumed to be compressible. The dynamic model includes the characteristics of the intensifier pump, the check valves, the accumulator, the system piping and compressible jet flow through the nozzle. The system model is presented as a set of differential-algebraic equations. Experimental results for an actual system are used to identify the discharge coefficient of the nozzle, certain unknown parameters associated with the check valve, and to determine the velocity profile of the piston in the intensifier pump. The identification is accomplished by formulating and solving a parameter optimization problem. The paper also includes numerical simulation results that validate the dynamic model.

The Efficiency Improvement of 11kW Axial Gap Motor with Amorphous Metal Cores

2014 ◽  
Vol 134 (8) ◽  
pp. 760-766 ◽  
Author(s):  
Yuta Sugiyama ◽  
Yuji Enomoto ◽  
Takao Imagawa ◽  
Hiromitsu Itabashi ◽  
Hirooki Tokoi
Keyword(s):  
Amorphous Metal ◽  
Efficiency Improvement

Efficiency Improvement of Switched Reluctance Motor by Single-Pulse Control with Variable Excitation Period

2015 ◽  
Vol 135 (3) ◽  
pp. 284-290 ◽  
Author(s):  
Yoshihiro Nakazawa ◽  
Kazuhiro Ohyama ◽  
Hiroaki Fujii ◽  
Hitoshi Uehara ◽  
Yasushi Hyakutake
Keyword(s):  
Single Pulse ◽  
Switched Reluctance Motor ◽  
Efficiency Improvement ◽  
Pulse Control ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Excitation Period

Efficiency Improvement of the Layered Seed Movement When Using Drum-Type Seed Disinfectant

2020 ◽  
Vol 13 (2) ◽  
pp. 125
Author(s):  
Eduard Khasanov ◽  
Rim Khamaletdinov ◽  
Ildar Gabitov ◽  
Salavat Mudarisov ◽  
Faile Gallyamov ◽  
...  
Keyword(s):  
Efficiency Improvement
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