Speed characteristics analysis and simulation of the water hydraulic axial piston motor

2016 ◽  
Vol 13 (6) ◽  
pp. 524-528 ◽  
Author(s):  
Lijie Yang ◽  
Guimei Wang ◽  
Songlin Nie
Keyword(s):  
Numerical Models ◽  
Simulation Models ◽  
Hydraulic Motor ◽  
Content Type ◽  
Swash Plate ◽  
Characteristics Analysis ◽  
Key Factor ◽  
Speed Performance ◽  
Water Hydraulic ◽  
Axial Piston

Purpose The purpose of this study is to analyze the speed characteristics of the water hydraulic axial piston motor. The speed performance of water hydraulic piston motor which uses water as medium is different from that mineral oil one. Design/methodology/approach To analyze the speed characteristics of the water hydraulic motor, the speed model of a swash plate water hydraulic piston motor is developed theoretically and a simulation model with AMESim is built. Findings The effects of clearance between friction pairs and input pressure on the speed are analyzed and compared between the theoretical and numerical models. Originality/value The results of the theoretical and simulation models both verify that the clearance of friction pairs is the key factor in the hydraulic piston motor’s speed.

Advanced Virtual Prototyping of Axial Piston Machines

2016 ◽  
Author(s):  
Rene Chacon ◽  
Monika Ivantysynova
Keyword(s):  
Numerical Models ◽  
Virtual Prototyping ◽  
Valve Plate ◽  
Cylinder Block ◽  
Plate Interface ◽  
Design And Optimization ◽  
Swash Plate ◽  
Axial Piston Machine ◽  
Axial Piston ◽  
Plate Type

This paper explains how a combination of advanced multidomain numerical models can be employed to design an axial piston machine of swash plate type within a virtual prototyping environment. Examples for the design and optimization of the cylinder block/valve plate interface are presented.

Non-probabilistic wear reliability analysis of swash-plate/slipper of water hydraulic piston motor based on convex model

2012 ◽  
Vol 227 (3) ◽  
pp. 609-619 ◽  
Author(s):  
Lijie Yang ◽  
Songlin Nie ◽  
Anqing Zhang
Keyword(s):  
Reliability Analysis ◽  
Friction Pair ◽  
Taylor Series Expansion ◽  
Experimental Information ◽  
Reliability Model ◽  
Hydraulic Motor ◽  
Convex Model ◽  
Interval Model ◽  
Swash Plate ◽  
Water Hydraulic

Water hydraulic piston motor is one of the important transmission components in a water hydraulic system. For lack of enough experimental information to analyze the reliability in water hydraulic motor design, the convex model is chosen as wear reliability model for hydraulic friction pairs, which is more economical and reasonable than the interval model. The non-probabilistic reliability index based on the convex model is established using first-order Taylor series expansion, and the non-probabilistic reliability model of wear reliability analysis for the friction pair of swash-plate/slipper in water hydraulic piston motor is introduced based on the convex model. For the non-probabilistic reliability model, only the bounds on uncertain parameters are needed, instead of probabilistic density distribution or statistical quantities. Numerical examples are used to illustrate the validity and feasibility of the presented method.

Forces Analysis of Piston Couple in Swash-Plate Axial Piston Motor

2013 ◽  
Vol 834-836 ◽  
pp. 1319-1322 ◽  
Author(s):  
Jin Yan Shi
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Optimal Design ◽  
Hydraulic Control ◽  
Hydraulic Motor ◽  
Swash Plate ◽  
Arbitrary Phase ◽  
The Mathematical Model ◽  
Axial Piston ◽  
Hydraulic Control System

Hydraulic motor is an important hydraulic component in hydraulic control system, so the analysis of its performance is very important. The piston couple is one of the most important frictional pairs in axial piston motor, this paper studies the forces on the piston couple of swash-plate axial piston motor. It deduces the mathematical model of forces analysis in arbitrary phase of the cylinder, and the forces of a type of axial piston motor are analyzed. And it gives suggestions for structure optimal design of piston couple.

Simulation of Fluid Power Components Using DSHplus and ADAMS

2001 ◽  
Author(s):  
Michael Deeken ◽  
Hubertus Murrenhoff
Keyword(s):  
Pressure Gradient ◽  
Simulation Models ◽  
Fluid Power ◽  
Piston Pump ◽  
Simulation Program ◽  
Axial Piston Pump ◽  
Hydraulic Simulation ◽  
Swash Plate ◽  
Mass Moment ◽  
Axial Piston

Abstract Efficiency improvement of an axial piston pump or motor is an important part in the design and development process. The behaviour of an axial piston pump or other displacement machines is a complex interaction between tribology of sliding contacts, pressure gradient in hydraulic volumes and dynamics and kinematics. Simulation programs are useful development tools to design these fluid power components on digital computers. At present all these programs are stand-alone tools and specialised to calculate a specific behaviour or effect of an axial piston pump or motor. To reproduce and to solve all this physical effects numerically in one program is impractical. Since the opportunity exists to couple standardised products, this is a promising approach. The paper presents a simulation approach of a displacement machine (axial piston pump in swash plate design) using two different kinds of simulation programs. The tribology, e.g. surface roughness, mixed lubrication and contact pressure, and the hydraulic, e.g. the computed pressure gradient and flows, are calculated numerically by means of DSHplus. The integration of all kind of forces and torque, e.g. mass moment of inertia and pressure forces, to solve the equation of motion is calculated with a multiple body simulation program, in this case ADAMS by Mechanical Dynamics. The flexible modelling of mechanical structures in ADAMS makes it possible to create various simulation models of motion, such as cylinders and valves. The mechanical simulation program is coupled with the hydraulic simulation program DSHplus. Both programs run simultaneously on PCs and exchange data in discrete simulation time intervals.

Water hydraulic axial piston motor cavitation characteristics based on CFD technology

2017 ◽  
Vol 14 (3) ◽  
pp. 231-236 ◽  
Author(s):  
Lijie Yang ◽  
Shuai Yin ◽  
Qingna Niu
Keyword(s):  
Bubble Dynamics ◽  
Internal Flow ◽  
Low Pressure ◽  
Valve Plate ◽  
Content Type ◽  
Pressure Region ◽  
Turbulence Effects ◽  
Computational Fluid Dynamics Cfd ◽  
Water Hydraulic ◽  
Axial Piston

Purpose The purpose of this paper is to analyze the cavitation characteristics of a water hydraulic axial piston motor (WHAPM) to improve the water motor performance, to reduce the vibration and noise and to prolong the service life of the motor. Design/methodology/approach The computational fluid dynamics (CFD) software PumpLinx is chosen to do cavitation analysis of the WHAPM. In this case, first, cavitation mechanism of the water piston motor is analyzed in depth. Then, considering the effects of bubble dynamics, the rate of phase transition, turbulence effects and non-condensable gas, the full cavitation model is selected, the dynamic CFD numerical model of internal flow field on the water hydraulic piston motor is established based on PumpLinx software and the fluid cavitation inside is numerically studied. Finally, the influence of the valve plate and pistons on motor cavitation is analyzed. Findings Research results show that there are two serious cavitation regions: one is the pressure transition region of the valve plate that is near the top dead center, and the other is the low-pressure region of the piston that is near the low-pressure transition area. Moreover, the more serious cavitation area is on the valve plate region. Originality/value The simulation results show that the proposed algorithm is able to detect the cavitation characteristics of the water piston motor. Besides, it is deduced that valve-plate structure optimization is more important than pistons to reduce cavitation influence.

scholarly journals Virtual Prototyping of Axial Piston Machines: Numerical Method and Experimental Validation

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1674 ◽  
Author(s):  
Rene Chacon ◽  
Monika Ivantysynova
Keyword(s):  
Numerical Models ◽  
Optimization Procedure ◽  
Cylinder Block ◽  
Plate Interface ◽  
Piston Cylinder ◽  
Swash Plate ◽  
Physical Prototype ◽  
First Time ◽  
Axial Piston ◽  
Plate Type

This article presents a novel methodology to design swash plate type axial piston machines based on computationally based approach. The methodology focuses on the design of the main lubricating interfaces present in a swash plate type unit: the cylinder block/valve plate, the piston/cylinder, and the slipper/swash plate interface. These interfaces determine the behavior of the machine in term of energy efficiency and durability. The proposed method couples for the first time the numerical models developed at the authors’ research center for each separated tribological interface in a single optimization framework. The paper details the optimization procedure, the geometry, and material considered for each part. A physical prototype was also built and tested from the optimal results found from the numerical model. Tests were performed at the authors’ lab, confirming the validity of the proposed method.

SEWHAPM: Development of a Water Hydraulic Axial Piston Motor for Underwater Tool Systems

2005 ◽  
Vol 219 (7) ◽  
pp. 639-655 ◽  
Author(s):  
S. L. Nie ◽  
G. H. Huang ◽  
Y. Q. Zhu ◽  
Z. Y. Li ◽  
Y. P. Li
Keyword(s):  
Performance Test ◽  
Mineral Oil ◽  
Hydraulic Motor ◽  
Design Guideline ◽  
Practical Applications ◽  
System Pressure ◽  
Plate Valve ◽  
Water Hydraulic ◽  
Global Moment ◽  
Axial Piston

Water hydraulic motor (WHM) is an important transmission component in a water hydraulic system. Because of different physicochemical properties of raw water when compared with mineral oil, the design for the WHM would be different from that for a mineral oil one. A static equilibrium-type water hydraulic axial piston motor (SEWHAPM), which is equipped with a global-moment-balanced plate valve and a hydrostatic slipper bearing with a concentric gap damper, is developed in this research. The mechanism of the global-moment-balanced plate valve is analysed to eliminate the irregular wear of the plate valve. Next, the relevant design guideline is constructed. A mathematical model of the hydrostatic slipper bearing is established, and the performance characteristics of the bearing are discussed. The theoretical analyses indicate that the load-carrying capacity of this hydrostatic slipper bearing is not correlated with system pressure, water viscosity, temperature, or rotor speed, and that the lubrication film thickness of the bearing possesses high rigidity. The fundamental principle for designing the hydrostatic slipper bearing is also derived. On the basis of a material-screening experiment, a SEWHAPM is fabricated and tested on a water hydraulic-component-performance test stand. The experimental results show that developed SEWHAPM is feasible, with its volumetric, mechanical, and total efficiencies being ∼86, 80, and 70 per cent, respectively, under a pressure of 10 MPa. The maximal output torque can reach ∼19.5Nm; the maximal speed can reach 3000 r/min. As a result of the aforementioned development, the SEWHAPM has been successfully used in an underwater tool system since 2002, and its performance has been tested, demonstrating that the developed equipment can meet the regulated requirements for its practical applications.

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