Simulation Model of an Axial Piston Pump Inclusive of Cavitation

2002 ◽  
Author(s):  
G. L. Berta ◽  
P. Casoli ◽  
A. Vacca ◽  
M. Guidetti
Keyword(s):  
Experimental Data ◽  
Pressure Transducer ◽  
Fluid Pressure ◽  
Piston Pump ◽  
Pressure Pulsations ◽  
Axial Piston Pump ◽  
One Dimensional ◽  
Fluid Properties ◽  
Relief Groove ◽  
Axial Piston

A mathematical model of an axial piston pump is presented. The numerical model is based on a finite volume concept. The pump has been divided in different volumes where fluid properties are assumed homogeneous. Since the reduction of the pressure pulsations is one of the most important aims of pump builders, the effects of the port plate relief groove design have been carefully modelled. The gaseous cavitation has been considered in a simplified manner. The pump has been modified in order to measure the fluid pressure inside one of the cylinders; therefore a conduit has been realized to connect the cylinder chamber to a pressure transducer that is placed in a non-rotating position. The fluid pressure inside the conduit has been modelled with a one dimensional scheme for unsteady flow. The code has been tested and calibrated by comparing its numerical results with a set of experimental data. The potentials of the code are presented, spanning over different geometries.

Cavitation in a high-speed aviation axial piston pump over a wide range of fluid temperatures

2021 ◽  
pp. 095765092110469
Author(s):  
Qun Chao ◽  
Zi Xu ◽  
Jianfeng Tao ◽  
Chengliang Liu ◽  
Jiang Zhai
Keyword(s):  
Temperature Effects ◽  
Pressure Pulsation ◽  
Piston Pump ◽  
Limiting Factors ◽  
Fluid Temperature ◽  
Cfd Model ◽  
Axial Piston Pump ◽  
Wide Range ◽  
Fluid Properties ◽  
Axial Piston

The axial piston pump in aerospace applications needs to operate over a wide range of fluid temperatures from −54°C to 135 °C. The fluid properties at such extreme temperatures will significantly affect the cavitation that is one of the major limiting factors for the efficiency and reliability of aviation axial piston pumps. However, it appears that very little of the existing literature studies the effects of extreme fluid temperatures on the pump cavitation. This paper aims to examine the temperature effects on the cavitation in an aviation axial piston pump. First, we develop a three-dimensional (3D) transient computational fluid dynamics (CFD) model to investigate the pump cavitation and validate it experimentally. Second, we use the validated CFD model to investigate the temperature effects on the pump cavitation by changing the fluid properties including viscosity, density, and bulk modulus. The numerical results show that low fluid temperature makes the aviation axial piston pump suffer serious cavitation due to high viscosity, leading to delivery flow breakdown, unacceptable pressure pulsation, and delayed pressure built up. In contrast, high fluid temperatures have minor effects on the cavitation although they increase the pressure pulsation and built-up time slightly.

Research on the Distributings of Vibration Sensors for Fault Diagnosis in Axial Piston Pump

2012 ◽  
Vol 472-475 ◽  
pp. 1155-1159
Author(s):  
Sheng Qiang Wu ◽  
Cai Qin Liu ◽  
Er Ling Cao
Keyword(s):  
Experimental Data ◽  
Fault Diagnosis ◽  
Research Result ◽  
Mechanical Vibration ◽  
Strong Support ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Vibration Sensors ◽  
Axial Piston ◽  
Feature Frequency

Considering that the distributings of sensors will affect the fault diagnosis results directly, how to distribute vibration sensors for fault diagnosis in axial piston pump are researched. The corresponding feature frequency bands of various faults are analyzed, effects of collecting signals are compared in differrent fixings of vibration sensors, placements scheme of the sensors is proposed. Combined with the experimental data, the best distributings of vibration sensors is obtained. Research result provide a strong support in the pump monitoring and fault diagnosis field and reference in other complex mechanical vibration fault diagnosis field.

Study on Effect of Relief Groove Angle Expressing the Position in Reducing Noise of Swash Plate Axial Piston Pump

2011 ◽  
Vol 311-313 ◽  
pp. 2215-2224 ◽  
Author(s):  
Yue Chao Song ◽  
Bing Xu ◽  
Hua Yong Yang
Keyword(s):  
Simulation Model ◽  
Optimal Shape ◽  
Piston Pump ◽  
Cylinder Pressure ◽  
Axial Piston Pump ◽  
Flow Ripple ◽  
Swash Plate ◽  
Relief Groove ◽  
Axial Piston ◽  
Important Structure

The objective of this paper is to study on the effect of the relief groove angle expressing the position in reducing noise of a swash plate axial piston pump. The relief groove is an important structure for reducing noise. Unfortunately the effect of the position of the relief groove is quite seldom explained in research reports. This paper focuses to this problem. A detail simulation model including the structure and position of the relief groove as well as the compressibility of oil film is built. The optimal shape of the relief groove is obtained by analyzing the flow ripple and cylinder pressure of the piston pump with the different shape of the relief groove on the port plate. The effect of the relief groove position and different structures on noise reducing is found by analyzing the flow ripple, cylinder pressure, sizes of relief groove and its location in different positions on the port plate. In this way the influences of the relief groove on reducing noise are found and the optimization of relief groove is obtained.

scholarly journals Novel design of hydrodynamic–magnetic compound support for cylinder block–valve plate in axial piston pump

AIP Advances ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 115221
Author(s):  
Jihai Jiang ◽  
Boran Du ◽  
Jian Zhang ◽  
Geqiang Li
Keyword(s):  
Valve Plate ◽  
Piston Pump ◽  
Cylinder Block ◽  
Axial Piston Pump ◽  
Axial Piston ◽  
Novel Design

The Performance Analysis and Experimental Research of Multiple Oil Ports Axial Piston Pump which Able to Control the Movement of Differential Cylinder Directly in the Closed Circuit

2011 ◽  
Vol 308-310 ◽  
pp. 388-400
Author(s):  
Xiao Gang Zhang ◽  
Long Quan
Keyword(s):  
Digital Simulation ◽  
Flow Distribution ◽  
Closed Circuit ◽  
Piston Pump ◽  
Distribution Area ◽  
Axial Piston Pump ◽  
Hydraulic Pump ◽  
Asymmetric Flow ◽  
New Type ◽  
Axial Piston

In order to realize that an asymmetric flow piston pump can control an asymmetric differential cylinder, a proposal about the application of an asymmetric flow-distributing axial piston pump is put forward. The new type of piston pump can output the flows with two different values to control the movement of the differential cylinder directly in the closed circuit and realize much ideal result of the control of the differential cylinder by a single pump. Also a simulation model of the hydraulic pump is established under the circumstance of SimulationX software, considering the characteristics of the movement of an individual piston, the oil compressibility, and the flow distribution area changed with the rotation angle. The key data of the pump is defined by means of digital simulation. In particular, an analysis is made on the dimension of the unloading groove of the port plate and the characteristics of the flow pulse of the pump. Furthermore, an experimental model pump is manufactured, the basic performances of the pump is tested on the experimental platform at various rotatory speeds such as pressure, flow and noise, in the end the accuracy of the principle is verified.

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