Multi-physics coupled modeling and analysis for the design of high speed valves

Shaoping Xiong, Purdue University

Abstract

This work involves the development of a new actuation system for high speed valves. The valve actuation system proposed in this work, named as energy coupler actuator (ECA), is to couple the translational valve components (poppet or spool) with a kinetic energy source (pump/motor shaft, flywheel, and etc.). The coupling system can allow dynamic coupling or decoupling to control the valve position. An ECA using a MR fluid coupling was selected to develop the first prototype of an energy coupler actuated valve (ECAV). MR fluid offers many advantages such as symmetric actuation performance to allow high pressure at either port, large and scalable actuation force, proportional control, long stroke in a short time and small moving mass. A unique contribution of this work is the development of valve models, which integrate the finite-element analysis (2D, 2D axisymmetric and 3D) and 1D lumped parameter equations. A multi-physics coupled model for an ECAV system was also developed using this method. The simulation study based on this model was performed to analyze the significant design parameters including dimensional parameters and operating parameters, resulting in two optimal design solutions of an ECA. A prototype ECA was fabricated based on one of the design solutions. The experimental testing of this prototype showed that it is capable of reaching the target 1.5mm stroke, equivalent to a 100 L/min @5 bar according to a CFD solution, within 3ms. Moreover, a 7mm long stroke was achieved in just 7ms. The measurement results corresponded with the simulation results, validating the multi-physics model developed for this prototype ECA.

Degree

Ph.D.

Advisors

Lumkes, Purdue University.

Subject Area

Agricultural engineering|Mechanical engineering|Systems science

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