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Technical Paper

Computerized Analysis of Fuel Systems Performance Dynamics

2003-03-03
2003-01-0729
In the search for fuel efficiency and emission control in modern gasoline powered automobile engine operation, the single largest problem is the knowledge of the state of the fuel involved. That is, when the fuel is totally liquid it can be handled in much the same way as a hydraulic system. In addition, when the fuel becomes a gas it will function in a manner similar to a pneumatic system. However, in a fuel system the actual state of the fuel depends on the composition of the fuel, the operating conditions, and the ambient conditions. To the authors' knowledge, the analytical model that describes the dynamic time-based performance of a fuel system has not been successfully formulated in the past due to the lack of an adequate time-based fuel state model. This paper will present a complete model of an engine fuel system along with a computer program that is capable of producing a computerized analysis of the dynamic performance for the system.
Technical Paper

Hydraulic Pump Performance as a Function of Speed and Pressure

1996-08-01
961741
Every hydraulic system use requires a pump to supply the necessary flow and support the imposed pressure cycle. Therefore the performance of the pump in a hydraulic system is critical to the overall performance of the system. It is a well known fact that the performance of a hydraulic pump is influenced by both the speed at which it is operating and the pressure to which it is subjected. This paper evaluates the volumetric efficiency of a hydraulic pump using both the fundamental expressions which are generally accepted and actual data test data. The widely accepted equation for pump leakage is presented along with an expression that includes the parameter of speed. Results obtained using a pressure-loaded gear pump are used to compare and evaluate the analytical expressions. This comparison reveals a significant influence of speed at high pressures on the volumetric efficiency of the pump.
Technical Paper

An Innovative Technique in Filter Rating

1985-09-01
851590
Sievability and separability are two major criteria which have been used in the past to appraise the performance of filters. Although both criteria have significance in rating filters, it has been demonstrated in practical applications that such ratings cannot reflect the entire spectrum of filter performance. Test data obtained from more than 1200 different filters tested in the past decade at the Fluid Power Research Center at Oklahoma State University indicate that two major intrinsic filtration parameters must be addressed to appropriately and accurately assess the characteristics of a filter. They are separability (power to capture) and retentivity (power to retain). The Epsilon Rating Method was developed from the Elutivity Theory, which considers the separability (Beta Filtration Ratio), the retentivity (Delta Ratio used to express the degree of particle desorption or caking) and system operating parameters.
Technical Paper

A Comparative Investigation of Filter Performance Under Laboratory and Field Conditions

1986-04-01
860735
The Standard Multipass (Beta) Filter Method (ISO 4572) has been a highly recognized and widely accepted test throughout industry since its introduction in the early 1970's. In the past decade, the Beta Method has indeed made a major contribution in assisting users in selecting filters to meet system design requirements. However, many complaints have been voiced by users that filters normally produce a lower particle removal efficiency under field applications than they do during laboratory tests. Research results from work carried out at the Fluid Power Research Center at Oklahoma State University indicate that the degradation of the filtration (Beta) ratio in service depends mainly on the filter's retentivity characteristic. This paper highlights the theoretical basis of the Epsilon Rating Method and the concept of retentivity. Most important, the paper uses these concepts to correlate filter performance between laboratory tests and field operation.
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