Purpose - The purpose of this work is to propose a new simplified numerical model, based on a very compact semi-empirical formulation, able to simulate the fluid dynamics behaviours of an electro-hydraulic servovalve taking into account several effects due to valve geometry (e.g. flow leakage between spool and sleeve) and operating conditions (e.g. variable supply pressure or water hammer). Study design/methodology/approach – The proposed model simulates the valve performance through a simplified representation, deriving from the linearized approach based on pressure and flow gains, but able to evaluate the mutual interaction between boundary conditions, pressure saturation, and leak assessment. Its performance was evaluated comparing with other fluid dynamics numerical models (a detailed physics-based high-fidelity one and other simplified models available in the literature). Findings - While still showing some limitations attributable to its simplified formulation, the proposed model overcomes several deficiencies typical of the most common fluid dynamic models available in the literature, describing the water hammer and the non-linear dependence of the delivery differential pressure with the spool displacement. Originality/value - Although still based on a simplified formulation with reduced computational costs, the proposed model introduces a new nonlinear approach that, approximating with suitable precision the pressure-flow fluid dynamic characteristic of a servovalve, overcomes the shortcomings typical of such models.

A new simplified fluid dynamic model for digital twins of electrohydraulic servovalves / DALLA VEDOVA, MATTEO DAVIDE LORENZO; Berri, PIER CARLO. - In: AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY. - ISSN 1748-8842. - (2021). [10.1108/AEAT-12-2020-0321]

A new simplified fluid dynamic model for digital twins of electrohydraulic servovalves

Matteo Davide Lorenzo Dalla Vedova;Pier Carlo Berri
2021

Abstract

Purpose - The purpose of this work is to propose a new simplified numerical model, based on a very compact semi-empirical formulation, able to simulate the fluid dynamics behaviours of an electro-hydraulic servovalve taking into account several effects due to valve geometry (e.g. flow leakage between spool and sleeve) and operating conditions (e.g. variable supply pressure or water hammer). Study design/methodology/approach – The proposed model simulates the valve performance through a simplified representation, deriving from the linearized approach based on pressure and flow gains, but able to evaluate the mutual interaction between boundary conditions, pressure saturation, and leak assessment. Its performance was evaluated comparing with other fluid dynamics numerical models (a detailed physics-based high-fidelity one and other simplified models available in the literature). Findings - While still showing some limitations attributable to its simplified formulation, the proposed model overcomes several deficiencies typical of the most common fluid dynamic models available in the literature, describing the water hammer and the non-linear dependence of the delivery differential pressure with the spool displacement. Originality/value - Although still based on a simplified formulation with reduced computational costs, the proposed model introduces a new nonlinear approach that, approximating with suitable precision the pressure-flow fluid dynamic characteristic of a servovalve, overcomes the shortcomings typical of such models.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2912752