NUMERICAL SIMULATION OF A SLIPPER MODEL FOR WATER HYDRAULIC PUMPS/MOTORS IN MIXED LUBRICATION

2005 ◽  
Vol 2005 (6) ◽  
pp. 509-514 ◽  
Author(s):  
Toshiharu KAZAMA
Keyword(s):  
Numerical Simulation ◽  
Mixed Lubrication ◽  
Water Hydraulic

scholarly journals Study on System Design and Integration of Variable Buoyancy Systems for Underwater Operation

2021 ◽  
Vol 71 (1) ◽  
pp. 124-133
Author(s):  
B. K. Tiwari ◽  
R. Sharma
Keyword(s):  
Numerical Simulation ◽  
Energy Consumption ◽  
System Design ◽  
Underwater Vehicles ◽  
Medium Size ◽  
Depth Control ◽  
Water Hydraulic ◽  
Simulation Results

This paper presents the design and analysis of the ‘Variable Buoyancy System (VBS)’ for depth control which is an essential operation for all underwater vehicles. We use the ‘Water Hydraulic Variable Buoyancy System (WHVBS)’ method to control the buoyancy and discuss details of the system design architecture of various components of VBS. The buoyancy capacity of the developed VBS is five kilograms and the performance of the VBS in standalone mode is analysed using numerical simulation. Presented VBS is operable to control the buoyancy up to sixty meters of depth and it can be directly installed to medium size UVs. Simulation results show that the developed VBS can reduce the energy consumption significantly and higher in each cycle (i.e. descending and ascending) of the same VBS in standalone mode being operated with either propeller or thruster for sixty meters depth of operation. Our results conclude and demonstrate that the designed VBS is effective in changing the buoyancy and controlling the heave velocity efficiently and this serves the purpose of higher endurance and better performances desired in rescue/attack operations related to the UVs both in civilian and defense domains.

Numerical simulation of mixed lubrication considering surface forces

2019 ◽  
Vol 140 ◽  
pp. 105878 ◽  
Author(s):  
Shuowen Zhang ◽  
Chenhui Zhang ◽  
Yuanzhong Hu ◽  
Liran Ma
Keyword(s):  
Numerical Simulation ◽  
Surface Forces ◽  
Mixed Lubrication

scholarly journals Numerical simulation model of a reciprocating seal based on the mixed-lubrication theory

2019 ◽  
Vol 2019 (13) ◽  
pp. 49-53
Author(s):  
Chong Xiang ◽  
Zixi Wang ◽  
Xiaohong Jia ◽  
Fei Guo
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Lubrication Theory ◽  
Mixed Lubrication

Analysis and Numerical Simulation of Leakage Flow of Low Speed High Torque Water Hydraulic Motor’s Plain Flow Distribution Pair

2012 ◽  
Vol 233 ◽  
pp. 204-207 ◽  
Author(s):  
Zhi Qiang Wang ◽  
Dian Rong Gao ◽  
Jia Huan Fei
Keyword(s):  
Numerical Simulation ◽  
Flow Velocity ◽  
Flow Distribution ◽  
Maximum Flow ◽  
Leakage Flow ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Water Hydraulic ◽  
The Relationship ◽  
Maximum Flow Velocity

In order to ensure volumetric efficiency of low-speed and heavy-torque water hydraulic motor, the relationship between leakage flow and clearance of motor’s plain flow distribution pair in which water is used as medium is analyzed, and it’s concluded that the clearance of port plate and rotor end should be controlled below 5μm. In addition, the port plate flow field was simulated by using CFD software, and got that the leakage flow of numerical simulation is greater than theoretical calculation, and the numerical simulation values are more credible. It is also found that the maximum flow velocity is 16 m/s when outer ring is working, and when inner ring is working the maximum flow velocity is 20 m/s.

Texture-induced effects causing reduction of friction in mixed lubrication for twin land oil control rings

2017 ◽  
Vol 232 (2) ◽  
pp. 166-178 ◽  
Author(s):  
Markus Söderfjäll ◽  
Roland Larsson ◽  
Pär Marklund ◽  
Andreas Almqvist
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Major Part ◽  
Cylinder Liner ◽  
Mixed Lubrication ◽  
Heavy Duty ◽  
Cavitation Model ◽  
Heavy Duty Diesel Engine ◽  
Liner Surface ◽  
Heavy Duty Diesel

Piston rings are responsible for a major part of the frictional losses in a heavy-duty diesel engine. Such losses can be reduced by applying texture, such as dimples, on the cylinder liner surface. This paper investigates the effect of such texture on the friction between a land of the oil control ring and a textured cylinder liner via numerical simulation. A simulation model considering inertia and mixed lubrication together with a mass-conserving cavitation model is developed. The model is used to determine the dimple parameters that yield the lowest amount of friction for a specific oil control ring of a heavy-duty diesel engine.

scholarly journals Numerical Simulation of a Slipper Model with Multi-Lands and Grooves for Hydraulic Piston Pumps and Motors in Mixed Lubrication

Lubricants ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 55
Author(s):  
Toshiharu Kazama
Keyword(s):  
Numerical Simulation ◽  
Contact Pressure ◽  
Power Loss ◽  
Numerical Solutions ◽  
Friction Torque ◽  
Mixed Lubrication ◽  
Operating Conditions ◽  
Axial Piston Pumps ◽  
Wide Range ◽  
Axial Piston

A theoretical model of a slipper with multi-lands and multi-grooves for swashplate type axial piston pumps and motors was established, including surface interactions. Further, a numerical simulation was conducted under an unsteady state and mixed lubrication conditions. Four model configurations were considered: A slipper with a single main land; a slipper with inner and main lands and a groove; a slipper with outer and main lands and a groove; and a slipper with inner, main, and outer lands with two grooves. Numerical solutions were obtained across a wide range of operating conditions in terms of center clearance, pad attitude, contact pressure, flow rate, friction torque, power loss, and stiffness. The motion and characteristics were differentiated into two groups: Slippers with a single-land and an annex inner-land; and slippers with an annex outer-land and a triple-land. The single-land and annex inner-land slippers exhibited smaller pad swing, whereas the triple-land and annex outer-land slippers reduced contact pressure and power loss.

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