This paper deals with the study of pipes and hoses dynamic characteristics variation with the fluid-wall equivalent bulkmodulus description, with particular attention devoted to the analysis of the wall thickness, of the mechanical constraintsand of the internal pressure both on the fluid celerity, and on the pipe frequency response. In particular, consideringboth the case of plain stress and of plain strain, the pipe wall compliance and bulk modulus are firstly derived as afunction of the internal pressure and of the wall elastic and geometrical characteristics. Then, the influence of the pipegeometry and of the wall thickness on the pipe wall compliance and bulk modulus are highlighted for some materials ofinterest for industrial, automotive and aerospace applications (steel, aluminium, titanium and wired rubber), and thedependency of the equivalent bulk modulus on these parameters and on fluid physical characteristics is highlighted.Finally, the influence of mechanical constraints, of pipe geometry, of fluid physical properties, of wall material and offluid pressure on the global pipe dynamic response characteristics, and in particular on the fluid celerity, on the Machnumber and on the natural frequency, is evidenced.
Numerical Characterization of Pipes And Hoses Dynamic Response / Borghi, Massimo; Milani, Massimo; Paltrinieri, Fabrizio; Zardin, Barbara. - ELETTRONICO. - I:(2006), pp. 1-9. (Intervento presentato al convegno 2nd International Conference on Computational Methods in Fluid Power tenutosi a Aalborg, Denmark nel August 02-03).