ASSESSMENT AND PRECISION ANALYSIS OF NONLINEAR AND SIMPLIFIED MODELS FOR SPOOL FLOW CONTROL VALVES WITH VARIOUS LAPPING GEOMETRIES

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TOUFIGHI M.H.; NAJAFI F.; SADATI S.H.; JAFARI A.A.

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Journal: Journal of Aerospace Mechanics Year:2014 | Volume:10 | Issue:1 Page(s): 33-44

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Title

ASSESSMENT AND PRECISION ANALYSIS OF NONLINEAR AND SIMPLIFIED MODELS FOR SPOOL FLOW CONTROL VALVES WITH VARIOUS LAPPING GEOMETRIES

Author(s)

TOUFIGHI M.H. | NAJAFI F. | SADATI S.H. | JAFARI A.A. | Issue Writer Certificate

Keywords

DIMENSIONAL ANALYSISQ3

ELECTRO-SERVO-VALVEQ2

NONLINEAR MODELSQ2

PRECISION ANALYSISQ2

Abstract

Nonlinear models of the flow control valves relate the control flows through the valve ports to the valve parameters. An integrated model covers thoroughly the critical-lapped, over-lapped and under-lapped valves. The non-equality of spool lands and incorrect null position of spools can also be simulated using this model. Moreover, the simplified model can be used base on some assumptions for ease of analysis. In this paper, an accuracy analysis is performed to compare a fully nonlinear valve model to the conventional simplified one. According to the second order linear model of a servohydraulic system, a non-DIMENSIONAL ANALYSIS for the fully nonlinear model shows that the accuracy of the model is independent of the specific categories of its parameters. In fact, the model error for a certain amount of hydraulic damping coefficient does not depend on the model parameters, such that a combination of these parameters leads to a constant damping coefficient. Therefore, the accuracy of the model can already be determined using simulation. This point provides a high flexibility to the hydraulic control system designer to put up the possibility of using simplified models without any need to determine the model errors. Because the hydraulic systems are barely driven beyond the scope of the desired frequency, it can be concluded that for some applications, the simplified model of the valves can accurately express the valve dynamic.

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APA: Copy

TOUFIGHI, M.H., NAJAFI, F., SADATI, S.H., & JAFARI, A.A.. (2014). ASSESSMENT AND PRECISION ANALYSIS OF NONLINEAR AND SIMPLIFIED MODELS FOR SPOOL FLOW CONTROL VALVES WITH VARIOUS LAPPING GEOMETRIES. AEROSPACE MECHANICS JOURNAL, 10(1), 33-44. SID. https://sid.ir/paper/102043/en

Vancouver: Copy

TOUFIGHI M.H., NAJAFI F., SADATI S.H., JAFARI A.A.. ASSESSMENT AND PRECISION ANALYSIS OF NONLINEAR AND SIMPLIFIED MODELS FOR SPOOL FLOW CONTROL VALVES WITH VARIOUS LAPPING GEOMETRIES. AEROSPACE MECHANICS JOURNAL[Internet]. 2014;10(1):33-44. Available from: https://sid.ir/paper/102043/en

IEEE: Copy

M.H. TOUFIGHI, F. NAJAFI, S.H. SADATI, and A.A. JAFARI, “ASSESSMENT AND PRECISION ANALYSIS OF NONLINEAR AND SIMPLIFIED MODELS FOR SPOOL FLOW CONTROL VALVES WITH VARIOUS LAPPING GEOMETRIES,” AEROSPACE MECHANICS JOURNAL, vol. 10, no. 1, pp. 33–44, 2014, [Online]. Available: https://sid.ir/paper/102043/en

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