Dynamic Modeling of a Variable Displacement Vane Pump Within an Engine Oil Circuit

2011 ◽  
Author(s):  
Bruce Geist ◽  
William Resh
Keyword(s):  
Operating Conditions ◽  
Engine Oil ◽  
Vane Pump ◽  
Pump Chamber ◽  
Chamber Volume ◽  
Performance Requirements ◽  
Oil Pump ◽  
Variable Displacement Vane Pump ◽  
Variable Displacement ◽  
And Performance

Automakers and the car-buying public maintain a strong and continuing interest in enhanced vehicle efficiency. Ideally, adaptively controlled oil pumps supply only enough flow within an engine to satisfy its performance requirements. Any extra flow wastes energy. In order to better understand how to improve engine and engine oil circuit efficiency, and to assess pump stability, a detailed dynamic model of a variable displacement vane pump (VDVP) is developed. This detailed pump model is mated to a simplified engine oil circuit model. This marriage allows for a detailed prediction of pump response under various simulated engine operating conditions. The VDVP modeled here adapts its pump chamber volumes according to 1) the feedback oil pressure provided from the engine oil circuit and 2) according to the sizing and installed compression loading of an internal spring. Many phenomena such as internal leakage from one pump chamber volume to another, variable oil conditions such as aeration and viscosity, as well as variations in choice for the internal spring rate and preload can be investigated for their effects on oil pump behavior and performance within the simplified oil circuit.

Transient Response and Thermal Performance of a Variable Displacement Vane Pump-Based Actuation System for Turbo Jet and Turbofan Aircraft Engines

2008 ◽  
Author(s):  
Paul J. Paluszewski ◽  
Mihir C. Desai
Keyword(s):  
Transient Response ◽  
Waste Heat ◽  
Vane Pump ◽  
Pumping System ◽  
Actuation System ◽  
Aircraft Fuel ◽  
Performance Predictions ◽  
Variable Displacement Vane Pump ◽  
Variable Displacement ◽  
And Performance

The Goodrich Variable Displacement Vane Pump (VDVP) has been described in earlier proceedings (GT2007-27948) as a potential solution to thermally constrained aircraft fuel systems. Higher fueldraulic system pressures and flow requirements have placed severe demands on fuel system thermal management techniques. Furthermore, larger heat loads from a variety of sources are constantly increasing the temperatures at which modern aircraft fuel systems are required to operate. The ongoing objective for the development of the VDVP and VDVP-based fuel systems is to minimize the waste heat returned to bulk fuel, which in turn can reduce or eliminate heat exchangers and/or increase aircraft mission capability. The earlier noted reference also describes how a twin-element pumping system can provide superior thermal and transient response when in a closed-loop pressure compensating regulation mode; one example of this is VDVP coupled to a Fixed Displacement Vane Pump (FDVP). These claims were substantiated analytically by several trade studies and performance predictions that have been performed throughout the development cycle. Since these performance predictions have been made, the aforementioned twin VDVP/FDVP pumping and control system has undergone extensive testing and development. This paper discusses the thermal and transient performance predictions and test data of the twin-element pumping system, and summarizes the development of the pumps and controls. For a given hypothetical mission cycle, the VDVP/FDVP fueldraulic system with quantified performance can be compared analytically to other pumping solutions operating in the same environment.

Integration of Postclosure Safety Analysis with Repository Design for the Yucca Mountain Repository through the Selection of Design Control Parameters

2008 ◽  
Vol 1124 ◽  
Author(s):  
Gerald Hans Nieder-Westermann ◽  
Robert H. Spencer ◽  
Robert W Andrews ◽  
Neil Brown
Keyword(s):  
Natural Environment ◽  
Configuration Management ◽  
Ground Surface ◽  
Safety Analysis ◽  
Yucca Mountain ◽  
Operating Conditions ◽  
Control Parameters ◽  
Performance Requirements ◽  
And Performance ◽  
Key Aspects

AbstractThe Yucca Mountain repository combines multiple barriers, both natural and engineered, which work both individually and collectively to limit the movement of water and the potential release and movement of radionuclides to the accessible environment. Engineered structures, systems and components (SSCs) are designed to function in the natural environment utilizing materials chosen to perform their intended functions in order to meet the postclosure performance objectives. Similarly, the features of the natural environment are expected to respond to the presence of the repository through geomechanical, hydrogeologic and geochemical changes. At Yucca Mountain, specific features, both engineered and natural have been identified as requiring design control during repository construction and operations. The integration between design and postclosure safety analysis is facilitated using design control parameters. The term “design control parameters” includes functions and performance requirements allocated to SSCs through the design process, as well as the attributes of SSCs that are developed during design (e.g., dimensions; weights; materials; fabrication and quality-control processes; and operating conditions). These control parameters provide an interface between the design and the analyzed postclosure safety bases, which needs to be maintained through the licensing process. Maintenance of the design is controlled through configuration management and procedural safety controls. The design control parameters serve three key purposes. First, they identify key aspects of the design that serve as the design bases for the designers of the SSCs of the facility. Second, they provide a useful input to the analyses of relevant postclosure features, events and processes (FEPs) and are used to either exclude FEPs from the postclosure safety analysis or as an input to models of included FEPs in the safety analysis. Finally, they provide important controlled interface constraints between the design and safety analyses organizations that are amenable to configuration management. Several examples of such design controls will be presented in this briefing. The first type of design controls relates to the location of the underground facility, including standoffs from faults and the ground surface. The second type of design controls relates to the configuration of the engineered features including the spacing of emplacement driftsand drip shield dimensions and characteristics. A third type of design controls relates to constraints on handling, loading and emplacing waste forms in canisters and waste packages in the emplacement drifts.

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.

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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