Experimental results for magneto-rheological stop valve

Magneto-rheological fluid (MR) is part of smart materials and main property, very used in practical applications, consists in viscosity modification in case of exposal to a magnetic field. Magneto-rheological stop valve (VMR) represents one of its most known applications. Thanks to non-Newtonian flow of MR fluid, its mathematical modelling is very difficult. Because of that part of the parameters of the mathematical model must be experimentally determined. This paper presents the determination of mathematical function that describes wave front of MR fluid flow, named wave front function. Furthermore, comparative experimental results obtained for VMR testing for different sets of parameters are presented. The influence of important parameters for VMR behaviour is studied. For this study, an experimental stand has been projected which allows VMR testing and dynamic parameters acquisition for this type of valves. By comparative study the influence of qualitative behavior of these parameters in VMR is determined. Based on data from this study accurate mathematical models can be realized depending on constructive variant of the valve.