A mathematical model of the motion of cutting particles in reverse circulation air drilling

2015 ◽  
Vol 256 ◽  
pp. 192-202 ◽  
Author(s):  
L.H. Zhu ◽  
Y. Huang ◽  
R.H. Wang ◽  
J.Y. Wang
2019 ◽  
Vol 356 ◽  
pp. 50-59
Author(s):  
Pinlu Cao ◽  
Hongyu Cao ◽  
Jine Cao ◽  
Miaomiao Liu ◽  
Baoyi Chen

2021 ◽  
Vol 2061 (1) ◽  
pp. 012079
Author(s):  
O Y Lebedev ◽  
A V Fil ◽  
E V Bondareva

Abstract One of the main problems of seamanship is steering the boat in reverse modes. This skill can be achieved using simulators or simulators that work based on a mathematical model. This model should adequately describe all ship maneuvers, including simulation in reverse modes. The article deals with the mathematical modeling of maneuvering from a ship in reverse. The authors performed model calculations, basic test maneuvers, such as “Circulation”, “Exit Circulation” and “Zigzag”. The analysis of trajectories testifies to the qualitative correspondence of the calculation results according to the mathematical model to the practice of navigation, and this model can be used for automatic control of the vessel, for assessing the movement of the vessel in reverse, and teaching navigation skills on simulators and simulators. The vessel when moving in reverse, at low speeds obeys the steering organ, but at speeds greater than the average stroke on the backward shift, it leaves the circulation very slowly and sometimes becomes uncontrollable. The withdrawal of a reverse circulation vessel is extremely difficult and requires additional skills and abilities from the navigator.


2008 ◽  
Author(s):  
Ishii Akira ◽  
Yoshida Narihiko ◽  
Hayashi Takafumi ◽  
Umemura Sanae ◽  
Nakagawa Takeshi
Keyword(s):  

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