A Study of the Internal Forces in a Variable-Displacement Vane-Pump—Part I: A Theoretical Analysis

1986 ◽  
Vol 108 (2) ◽  
pp. 227-232 ◽  
Author(s):  
A. M. Karmel
Keyword(s):  
Design Criterion ◽  
Fluid Viscosity ◽  
Hydraulic Systems ◽  
Continuous Component ◽  
Vane Pump ◽  
Pump Design ◽  
Dynamics And Control ◽  
Variable Displacement ◽  
Line Pressure ◽  
Periodic Components

Growing energy costs continue to motivate the use of variable-displacement pumps in hydraulic systems with varying flow requirements. This study presents an analysis of the internal pressure-distribution in variable-displacement vane-pumps, and of the resulting forces and torques applied to their mechanisms and shafts. This analysis is essential to the study of the pump dynamics and control, the pump design, and the selection of the pump bearings. These forces are shown to be a function of the line pressure, the pump eccentricity, the shaft rotational speed, the fluid bulk modulus, the fluid viscosity, and the design geometry. These forces are composed of two periodic components: a continuous component due to the exposure of chambers to the line port, and an intermittent component due to a hydraulic-lock phenomenon. A design criterion is formulated which eliminates magnitude variations in the continuous component of the radial shaft-load.

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.

A Study of the Internal Forces in a Variable-Displacement Vane-Pump—Part II: A Parametric Study

1986 ◽  
Vol 108 (2) ◽  
pp. 233-237 ◽  
Author(s):  
A. M. Karmel
Keyword(s):  
Parametric Study ◽  
Analytical Study ◽  
Design Criterion ◽  
Vane Pump ◽  
Continuous Components ◽  
Variable Capacity ◽  
Variable Displacement Vane Pump ◽  
Variable Displacement ◽  
Internal Forces ◽  
Line Pressure

This is the second part of an analytical study of the internal forces in a variable-displacement vane-pump. It presents a parametric study of the forces and torques applied to the mechanism and the shaft of this pump, as functions of line pressure, the eccentricity, and the design geometry. It is shown that the continuous components of the torque and of the direction of the radial shaft-load vary as a sawtooth wave at twice the vane-frequency while the magnitude of the radial shaft-load varies as a square wave at vane-frequency. The design criterion developed in the first part of this study is used to demonstrate the elimination of the magnitude variations in the radial shaft-load. The intermittent components of the internal forces vary as a pulse train at vane frequency and may produce high-peak pressure pulses which must be closely controlled. The variable-capacity feature of variable-displacement vane-pumps has a significant effect on the torque applied to the mechanism, but only a secondary effect on the overall radial shaft-load.

Stability and Regulation of a Variable-Displacement Vane-Pump

1988 ◽  
Vol 110 (2) ◽  
pp. 203-209 ◽  
Author(s):  
A. M. Karmel
Keyword(s):  
Hydraulic System ◽  
Critical Frequency ◽  
Pressure Fluctuations ◽  
Resistive Load ◽  
Pressure Regulation ◽  
Vane Pump ◽  
Variable Displacement Vane Pump ◽  
Variable Displacement ◽  
Line Pressure ◽  
The Stability

Pressure fluctuations may develop in the hydraulic system of automatic transmissions, even under steady-state conditions. To analyze this phenomenon, a dynamic model was developed for a system which consists of a variable-displacement vane-pump, a regulator, and a resistive load. The model was linearized and reduced to generate a stability criterion for the pressure-regulation circuit. This criterion determines a critical frequency that the natural frequency of the pressure-regulation valve must exceed to assure stability. This critical frequency depends primarily on the damping of the spool of the pressure-regulation valve and on its position; the latter is a function of the regulation-chamber leakage characteristics. The analysis shows that line pressure, flow and leakage, along with production tolerances and different opening conditions, have a significant effect on the stability of the hydraulic system. Test data support the analysis.

scholarly journals Dynamic and efficiency characteristics of an inlet metering valve controlled fixed displacement pump

2016 ◽  
Author(s):  
◽  
Julie Kay Wisch
Keyword(s):  
Significant Loss ◽  
Hydraulic Systems ◽  
Hydraulic Pump ◽  
Pump Design ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Spool Valve ◽  
Complex Parts ◽  
Pressure Controlled ◽  
Variable Displacement Pumps

This project developed the inlet metering system. An inlet metering system represents a new option in hydraulic pump design. Traditional pressure controlled hydraulic pumps rely on either swashplate displacement (for variable displacement pumps) or bleed off valves (for fixed displacement pumps). Variable displacement pumps require mechanically complex parts which are expensive to machine and prone to break down. Bleed off valves represent a significant loss in system efficiency. In contrast, the inlet metering system is able to make use of a fixed displacement pump (which is relatively inexpensive and mechanically robust) and a two-way spool valve. This dissertation goes through the process of designing the valve and pump dimensions, presents a theoretical dynamic analysis, studies the control law associated with this pump, and examines the energy requirements associated with inlet metering system operation. A prototype of the design was constructed and experimental data was used to validate the efficiency analysis. The major finding associated with this work was that the inlet metering system can be designed to display a first order pressure response. This means that when the inlet metering system is operated, the actual pressure in the system will never exceed the desired pressure. In contrast, traditional hydraulic systems will display up to 60% pressure overshoot, meaning the systems must be designed to handle pressures significantly greater than operating pressures. Additionally it was found that the inlet metering system is more efficient than using a bleed off valve, but less efficient than using a variable displacement pump.

scholarly journals A Matrix FMEA Analysis of Variable Delivery Vane Pumps

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1741
Author(s):  
Joanna Fabis-Domagala ◽  
Mariusz Domagala ◽  
Hassan Momeni
Keyword(s):  
Risk Analysis ◽  
Failure Modes ◽  
High Reliability ◽  
Matrix Analysis ◽  
Hydraulic Systems ◽  
Vane Pump ◽  
End Effects ◽  
Root Cause ◽  
Preventative Measures ◽  
Fmea Analysis

Hydraulic systems are widely used in the aeronautic, machinery, and energy industries. The functions that these systems perform require high reliability, which can be achieved by examining the causes of possible defects and failures and by taking appropriate preventative measures. One of the most popular methods used to achieve this goal is FMEA (Failure Modes and Effects Analysis), the foundations of which were developed and implemented in the early 1950s. It was systematized in the following years and practically implemented. It has also been standardized and implemented as one of the methods of the International Organization for Standardization (ISO) 9000 series standards on quality assurance and management. Apart from wide application, FMEA has a number of weaknesses, which undoubtedly include risk analysis based on the RPN (Risk Priority Number), which is evaluated as a product of severity, occurrence, and detection. In recent years, the risk analysis has been very often replaced by fuzzy logic. This study proposes the use of matrix analysis and statistical methods for performing simplified RCA (Root Cause Analysis) and for classification potential failures for a variable delivery vane pump. The presented methodology is an extension of matrix FMEA and allows for prioritizing potential failures and their causes in relation to functions performed by pump components, the end effects, and the defined symptoms of failure of the vane pump.

Simulation on Displacement Characteristics of Variable Displacement of Double-Action Vane Pump

2010 ◽  
Vol 152-153 ◽  
pp. 1088-1091
Author(s):  
Lei Chen ◽  
Pan Zhang
Keyword(s):  
Simulation Model ◽  
High Speed ◽  
Steering System ◽  
Vane Pump ◽  
Hydraulic Power ◽  
Power Steering ◽  
Simulink Simulation ◽  
Variable Displacement ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering

On of the practical difficulties of high speed automotive hydraulic power steering is that the output exceeds the actual demands of the system, i.e., there is a substantial power loss. This paper discusses the configuration and the action principle of a new variable displacement of double-action vane pump, which consists of floating blocks. The pump belongs to an automotive hydraulic power steering system, and prosperous utilization is expected. In the meantime the mathematical and simulation model for hydraulic power steering of automobile were established and the Matlab Simulink simulation model was presented. Different parameters of pump are selected in simulating programming. The simulating results are analyzed and compared.

scholarly journals Nonlinear Volume Flow Control of a Variable Displacement Vane Pump

PAMM ◽  
2015 ◽  
Vol 15 (1) ◽  
pp. 635-636 ◽  
Author(s):  
Marius Köster ◽  
Alexander Fidlin
Keyword(s):  
Flow Control ◽  
Volume Flow ◽  
Vane Pump ◽  
Variable Displacement Vane Pump ◽  
Variable Displacement
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