A Study of the Effect of the Inertia Force of the Vanes on the Performance of the Hydraulic Vane Pump with Hypertrochoid Curve in the Inner Surface of its Stator

2012 ◽  
Vol 463-464 ◽  
pp. 297-300
Author(s):  
M. Ebrahimi ◽  
S.A. Jazayeri
Keyword(s):  
Inertia Force ◽  
Vane Pump ◽  
Sliding Motion ◽  
Radial Movement ◽  
Inner Surface ◽  
Vibration Noise ◽  
Hydraulic Balance ◽  
Vane Tip

Performance of a fixed displacement hydraulic balance vane pump, theoretically and practically was studied by application of the hypertrochoid curve in the inner surface of its stator. In addition to improving a sealing action between pressure and suction sides of the pump, one of the important characteristics of the hypertrochoid profile is improving of the inertial reaction of the vanes in each position where these vanes have a radial movement. Then it causes a smooth sliding motion of the vanes, and hence, a higher performance of the pump while attaining a longer life of it because of decreasing vane- tip and inner surface of stator wear and decreasing of vibration, noise and high stresses.

The Inertia Force of the Vanes in the Hydraulic Vane Pump with Advanced Hypertrochoid Curve in the Inner Surface of its Stator

2013 ◽  
Vol 325-326 ◽  
pp. 1440-1444 ◽  
Author(s):  
Mojtaba Ebrahimi ◽  
Seyed Ali Jazayeri
Keyword(s):  
Inertial Force ◽  
Inertia Force ◽  
Vane Pump ◽  
Regular Motion ◽  
Sliding Motion ◽  
Radial Movement ◽  
Inner Surface

The possibility of application of the advanced hypertrochoid curve in the inner surface of the stator of fixed displacement hydraulic vane pump, theoretically was studied in the last our work. By considering the properties of this curve, sealing action between pressure and suction sides of the pump can be improved. One of the important characteristics of a new profile must be improving of the inertial reaction of the vanes in each position where these vanes have a radial movement because it causes a smooth sliding motion of the vanes, and hence, a higher performance of the pump while attaining a longer life of it. Then at this paper, the effect of the inertial force of the vanes on the performance of the pump with this curve will be studied. The regular motion of the vanes on the inner surface of the stator with smooth profile suppresses the lateral reactional force applied to the vanes and results to diminish local wear of the vanes tip and noise.

A Theoretical Study of the Internal Forces in a Hydraulic Vane Pump with Hypertrochoid Curve in the Inner Surface of its Stator

2012 ◽  
Vol 463-464 ◽  
pp. 301-304 ◽  
Author(s):  
M. Ebrahimi ◽  
S.A. Jazayeri
Keyword(s):  
Inertia Force ◽  
Fluid Viscosity ◽  
Vane Pump ◽  
Pump Design ◽  
Inner Surface ◽  
Dynamics And Control ◽  
Internal Forces ◽  
Line Pressure ◽  
And Control ◽  
Selection Of

In the latest our works, Performance of a fixed displacement- hydraulic balance vane pump, theoretically and practically was studied by application of the basic hypertrochoid curve in the inner surface of its stator. Also the effect of the inertia force of the vanes on the performance of the pump with this curve was studied. This study presents a theoretical analysis of the internal pressure distribution in the pump, and of the resulting forces and torques applied to its components. This analysis is essential to the study of the pump dynamics and control, the pump design, and selection of the pump bearings. These forces are shown to be a function of the line pressure, the shaft rotational speed, the fluid bulk modulus, the fluid viscosity, and the design geometry. These forces are composed of two components: a continuous component due to the exposure of chambers to the line port, and an intermittent component due to a hydraulic lock phenomenon.

Vane tip detachment in a positive displacement vane pump

1998 ◽  
Vol 12 (5) ◽  
pp. 881-887 ◽  
Author(s):  
Myung-Rae Cho ◽  
Dong-Chul Han
Keyword(s):  
Vane Pump ◽  
Positive Displacement ◽  
Vane Tip

Lubrication and Fluid Film Study on the Vane Tip in a Vane Pump Hydraulic Transmission Considering a Fluid and Structure Interaction

2021 ◽  
Vol 143 (12) ◽  
Author(s):  
Feng Wang ◽  
Zhenxing Sun ◽  
Wieslaw Fiebig ◽  
Bing Xu ◽  
Kim A. Stelson
Keyword(s):  
Film Thickness ◽  
Radial Motion ◽  
Output Shaft ◽  
Fluid Film ◽  
Chamber Pressure ◽  
Vane Pump ◽  
Thickness Change ◽  
Modeling Approach ◽  
Fluid Film Thickness ◽  
Vane Tip

Abstract A mathematical modeling approach to determine fluid film thickness on the vane tip in a vane pump transmission is developed. The transmission is based on a double-acting vane pump with an additional output shaft coupled to a floating ring. Owing to the floating ring design, the internal viscous friction helps to drive the output shaft, whereas the friction is turned into heat in a conventional vane pump. To study the mechanical efficiency, it is crucial to investigate the fluid film thickness between the vane tip and the ring inner surface. The modeling approach in this study takes the interactions between vane radial motion and chamber pressure dynamics into consideration, without using a computational fluid dynamics approach. The lubrication on the vane tip is considered as elasto-hydrodynamic lubrication and the fluid film thickness calculation is based on the Hooke lubrication diagram. Results show that the developed simulation model is capable of revealing the fluid film thickness change and vane radial motion in different operation regions. Sensitivity studies of several parameters on the minimum fluid film thickness are also presented.

Study on the Seismic Response of Cable Tray Considering Sliding Motion of Cable

2014 ◽  
Author(s):  
Tomohiro Ito ◽  
Yasuhiko Azuma ◽  
Atsuhiko Shintani ◽  
Chihiro Nakagawa
Keyword(s):  
Power Plants ◽  
Structural Integrity ◽  
Thermal Power ◽  
Vertical Direction ◽  
Inertia Force ◽  
System Response ◽  
Seismic Responses ◽  
Sliding Motion ◽  
Highly Nonlinear ◽  
Supporting Structures

In various industrial plants such as thermal power plants, nuclear power plants, and chemical plants, many cable trays are generally used to support cables for control signals. Cable trays are very long, and thus are supported from ceilings or walls by many supporting structures. When the cable trays are subjected to strong seismic excitations, the trays or the supporting structures vibrate with large amplitudes. In the worst cases, they can collapse, and plants can lose control of systems, which can lead to severe accidents. Therefore, it is very important to maintain the structural integrity of cable trays during seismic events including recent severe earthquakes such as the East Japan Earthquake in 2011. Cable trays are generally made of thin steel plates with sides folded in the vertical direction, and with cables simply placed on the tray. Thus, cables can slide when the inertia force on the cables exceeds the friction force between the tray and cables. The mass of the cables is relatively large compared to that of a tray, thus the natural frequency of the tray will change significantly due to the cable sliding motion. Consequently, seismic responses of cable tray will also depend on the sliding motion of cables. Therefore, cable trays are seen as highly nonlinear structural systems. In this study, seismic responses of cable trays are investigated analytically considering cable sliding motions. A cable tray is modeled by a two-degree-of-freedom system. Response acceleration, and the displacements of the tray and the cable are evaluated for both sinusoidal and seismic inputs by varying the cable mass or friction coefficient between the tray and cables. It is confirmed that the sliding motion of the cable has a very large influences on the seismic responses of the cable-tray system.

Dynamic Behavior of Twin-Piece Vane Machine

2000 ◽  
Vol 124 (1) ◽  
pp. 74-78 ◽  
Author(s):  
Ma Guoyuan ◽  
Yan Qisen ◽  
Yu Yongzhang
Keyword(s):  
Dynamic Model ◽  
Dynamic Behavior ◽  
Thickness Ratio ◽  
Friction Loss ◽  
Oil Film ◽  
Viscous Loss ◽  
Inner Surface ◽  
Binding Forces ◽  
Machine Analysis ◽  
Vane Tip

This paper describes a twin-piece vane machine which has freely movable double vanes assembled in each slot machined in the rotor providing double seal lines between the vane tips and the inner surface of the cylinder. Analysis of the motion, forces, friction, wear and stresses in the vanes with a dynamic model demonstrates that the twin-piece vane machine has decreased the binding forces, friction losses and wear on the vane tip, but increased vane stresses. The results also indicate that most of the friction loss occurs at the vane tip with additional friction loss on the vane sides. The viscous loss caused by the oil film between the double vanes is so small that it can be neglected in engineering calculations. The ratio of the upper vane thickness to the lower vane thickness is one of the most important parameters for the twin-piece vane machine. Analysis of the influence of this ratio on the forces, friction, wear and strength of the vanes was used to optimize the thickness ratio for the twin-piece vane machine.

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