A Parameter Sensitivity Analysis for the Dynamic Model of a Variable Displacement Axial Piston Pump

Kim, S D; Cho, H S; Lee, C O

doi:10.1243/pime_proc_1987_201_115_02

Cited by 38 publications

(17 citation statements)

References 2 publications

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“…The angle of the swash plate, a, is controlled with a hydraulic servo-system that is attached to the swash plate by a mechanical arm of length L. The forces of the servo system are resisted by a naturallyinduced torque on the swash plate, T, that results from the pumping action of the pump itself. Since it has previously been shown that the inertia of the swash plate is negligible compared to the stiffness of the servo system (Kim et al, 1987;Zeiger and Akers, 1986), the moments on the swash plate can be …”

Section: (7)mentioning

confidence: 99%

“…Until recently, little has been known about the driving forces of the swash plate itself in open literature and, perhaps, Zeiger and Akers (1985) are to be credited for the pioneering work in this area. Since the work of Zeiger and Akers, other research regarding the dynamics and control of the swash plate has appeared in the literature (Manring and Johnson, 1994;Schoenau et al, 1990;Kim et al, 1987;Zeiger and Akers, 1986). All of this work has contributed to a better understanding of the variable-displacement pump and to a better understanding of the hydrostatic transmission as a whole.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Designing a Hydrostatic Transmission With a Fixed-Displacement Motor

Manring

Luecke

1998

Journal of Dynamic Systems, Measurement, and Control

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This study develops the dynamic equations that describe the behavior of a hydrostatic transmission utilizing a variable-displacement axial-piston pump with a fixed-displacement motor. In general, the system is noted to be a third-order system with dynamic contributions from the motor, the pressurized hose, and the pump. Using the Routh-Hurwitz criterion, the stability range of this linearized system is presented. Furthermore, a reasonable control-gain is discussed followed by comments regarding the dynamic response of the system as a whole. In particular, the varying of several parameters is shown to have distinct effects on the system rise-time, settling time, and maximum percent-overshoot. Disciplines Mechanical Engineering Comments

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Section: (7)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Designing a Hydrostatic Transmission With a Fixed-Displacement Motor

Manring

Luecke

1998

Journal of Dynamic Systems, Measurement, and Control

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“…Kim et al [10] conducted a study on the sensitivity of the outlet pressure control to certain parameters within the pump system, and the total torque on yoke due to the force of pumping pistons and bias pistons was given. However, the high-frequency swash plate oscillation was not discussed.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Effects of the Variable Displacement Mechanism on Swash Plate Oscillation in High-Speed Piston Pumps

2018

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High-speed, pressure-compensated variable displacement piston pumps are widely used in aircraft hydraulic systems for their high power density. The swash plate is controlled by the pressure-compensated valve, which uses pressure feedback so that the instantaneous output flow of the pump is exactly enough to maintain a presetting pressure. The oscillation of the swash plate is one of the major excitation sources in the high-speed piston pump, which may cause lower efficiency, shorter service life, and even serious damage. This paper presents an improved model to investigate the influence of the variable displacement mechanism on the swash plate oscillation and introduces some feasible ways to reduce oscillation of the swash plate. Most of the variable structural parameters of the variable displacement mechanism are taken into consideration, and their influences on swash plate oscillation are discussed in detail. The influence of the load pipe on the oscillation of the swash plate is considered in the improved model. A test rig is built and similarities between the experiments and simulated results prove that the simulation model can effectively predict the variable displacement mechanism state. The simulation results show that increasing the volume of the outlet chamber, the spring stiffness of the control valve, the action area of the actuator piston, and offset distance of the actuator piston can significantly reduce the oscillation amplitude of the swash plate. Furthermore, reducing the diameter of the control valve spool and the dead volume of the actuator piston chamber can also have a positive effect on oscillation amplitude reduction.

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“…For instance, a Local Sensitivity Analysis (LSA) to a nonlinear variable displacement axial piston pump model was applied to study parameter sensitivities and to reduce model order (Kim et al, 1987), and to a linear water quality model (Pastres et al, 1997). In LSA, parameters …”

Section: Introductionmentioning

confidence: 99%

Detection and Isolation of Leakage and Valve Faults in Hydraulic Systems in Varying Loading Conditions, Part 1: Global Sensitivity Analysis

Nurmi¹,

Mattila²

2011

International Journal of Fluid Power

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Model-based condition monitoring methods are widely used in condition monitoring. They usually rely on ad hoc approaches to verify the system model and then best practices are reported to detect the given set of faults. This first part of a two-piece paper introduces a generic Global Sensitivity Analysis-based approach that can be applied systematically to verify the model parameter sensitivities used for the model-based fault detection. The case study is a generic servo valve-controlled hydraulic cylinder with unknown loading condition which is then systematically analyzed with Global Sensitivity Analysis. The method shows valuable insight into systematic model verification and resulting fault detection in terms of showing the dominant sensitivity of the nominal flow rate and nominal pressure difference, and the exact sensitivities of 0 -1 dm 3 /min external and internal leakages on cylinder chamber pressures and velocity. In the second paper, an Unscented Kalman Filter-based Fault Detection and Isolation scheme for leakage and valve faults of a generic servo valve-controlled hydraulic cylinder is devised and fault patterns are presented.

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A Parameter Sensitivity Analysis for the Dynamic Model of a Variable Displacement Axial Piston Pump

Cited by 38 publications

References 2 publications

Modeling and Designing a Hydrostatic Transmission With a Fixed-Displacement Motor

Modeling and Designing a Hydrostatic Transmission With a Fixed-Displacement Motor

Investigation into the Effects of the Variable Displacement Mechanism on Swash Plate Oscillation in High-Speed Piston Pumps

Detection and Isolation of Leakage and Valve Faults in Hydraulic Systems in Varying Loading Conditions, Part 1: Global Sensitivity Analysis

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