Pressure Pulsation Characteristic Analysis of the Non-dead Spots Transition Zone between Flow Distribution Windows of Axial Piston Pump

2011 ◽  
Vol 47 (24) ◽  
pp. 128
Author(s):  
Yang YANG
Keyword(s):  
Transition Zone ◽  
Pressure Pulsation ◽  
Flow Distribution ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Characteristic Analysis ◽  
Pulsation Characteristic ◽  
Axial Piston

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.

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 Dynamics and Variable Characteristics of a Double-Swash-Plate Hydraulic Axial Piston Pump With Port Valves

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Pengcheng Qian ◽  
Zengqi Ji ◽  
Bihai Zhu
Keyword(s):  
Rotational Speed ◽  
Flow Distribution ◽  
Variable Method ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Working Pressure ◽  
Swash Plate ◽  
Working Principle ◽  
Hydraulic Axial Piston Pump ◽  
Axial Piston

Axial piston pumps with port valves are widely used in applications that require high pressure and high power. In the present research, a new type of double-swash-plate hydraulic axial piston pump (DSPHAPP) with port valves is presented. The structure and working principle of the pump are discussed, and the balance characteristics of the pump are analyzed. A mathematical model of the pump flow distribution mechanism considering the leakage is established, based on which the effects of centrifugal forces acting on the port valves, working pressure, and rotational speed on the flow distribution characteristics are studied. A new method of varying the displacement of the pump that changes the phase relation of the two swash plates is proposed, and the principle and regulating characteristics of the variable method are studied. A detailed analysis of the forces and moments acting on the cylinder and the bearing reaction forces is presented. Finally, the relationship between volumetric efficiency and working pressure, and rotational speed and variable angle, is presented. It is revealed through an analysis that the working principle of the pump is feasible, and that the variable method can meet the requirements of varying the displacement of the pump. The characteristics of static balance and dynamic balance of the double-swashplate pump have the advantage of reducing vibration and noise. The research results also show that the reasonable matching of the working pressure and rotational speed can increase the pump's working performance to its optimum level.

scholarly journals Aircraft hydraulic axial piston pump fundamental pulsation and simulation

2021 ◽  
Vol 1208 (1) ◽  
pp. 012008
Author(s):  
Želimir Husnić ◽  
Remzo Dedić ◽  
Faris Ustamujić ◽  
Zlata Jelačić
Keyword(s):  
Fundamental Frequency ◽  
Health Monitoring ◽  
Hydraulic System ◽  
Pressure Pulsation ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
System Health Monitoring ◽  
Predictive Approach ◽  
Hydraulic Axial Piston Pump ◽  
Axial Piston

Abstract The axial piston pump for aircraft hydraulics systems and other high pressure hydraulic system applications is presented. This paper discusses the pump’s pressure pulsation and the fundamental frequency. Pressure pulsation associated with single piston failure is explained in relation to its fundamental frequency. A predictive approach in maintenance and pump sub system health monitoring is proposed, using numerical modelling and applicable software.

The Research on the Fault Mechanism of Port Plate/Cylinder Block Frictional Pair in Axial Piston Pump

2007 ◽  
Author(s):  
Lan Li ◽  
Shaoping Wang ◽  
Shuai Shi ◽  
Hongmei Liu
Keyword(s):  
Flow Characteristics ◽  
Flow Distribution ◽  
Piston Pump ◽  
Cylinder Block ◽  
Frictional Pair ◽  
Axial Piston Pump ◽  
Noise And Vibration ◽  
Diagnosis Method ◽  
Fault Mechanism ◽  
Axial Piston

The problem of vibration and noise in axial piston pump has been intensively studied in the past; however, recently the interest about this problem grew because of great requirement for designing excellent performance axial piston pump having high pressure, high rotating speed and high flow characteristics etc. One of the most important noise and vibration sources is the flow distribution noise caused by the shock pressure of flow distribution and cavitations in the process of the regulation of working conditions, and the vibration caused by wearing of the port plate frictional pair. A lot of methods have been developed to reduce the flow distribution impulsion and the port plate wearing by improving the design of port plate as well as the materials of axial piston pump. However, the current research level remains incomplete and there are still noise and vibration existing in the axial piston pump. So it is very important to develop efficient diagnosis methods for online monitoring the hydraulic pump which helps to increase the reliability of the whole fluid power system. In the present paper the structure and working principle of port plate in axial piston pump is discussed first. Then this paper proposes a fault diagnosis method based on vibration signals after analyzing the fault mechanism of the port plate frictional pair. And it verifies the diagnosis method through experiment and gives out the analysis result. The result indicates that the vibration signal is sensitive to the port plate frictional pair’s wearing fault.

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