Certain properties of fluid change with pressure, temperature and other operating system conditions. In automotive hydraulic systems driven by pumps, air usually enters the system as dissolved matter or very small bubbles. Such air will change certain properties of the fluid like the density, bulk modulus and viscosity. Measuring these properties for evaluating system performance in real operating conditions is one of the big challenges that face engineers. In this paper, the bulk modulus of certain power steering fluids is measured using standard impedance and flow ripple tests for pumps. The effects of pressure, temperature and speed on the bulk modulus are studied thoroughly.

Extrusion Freeform Fabrication (EFF) is an adaptation of the Stratasys Fused Deposition M?deling(FDMTM) . . process.for the• Solid FreeformFabrication (SFF) .of functional ceramic prototypes. It isa c0tnplex process involving many process variables, including parameters that are operation, lllachine,. materials, and geometry specific. A TaguchifactorialDesign of Experiments (DOE)technique.was utilized to study the effects• of machine specific process Pal7arnetersias •welL as . their interactions based on• the mechanical and physical properties of sintered ceramicspeci11lens. Post-processing software was developed to control and modify these parameters. [his software interface was .designed to mimic the QuicksHce™ interface for setting motion parameters based upon the material and the operation. Theresults of this investigation provided/useful information for the experilllentaLanalysis of the machine .specific process parfmeters.Suitable p~ratn~terswereselectedforthe EFF process fori fabricating representative ceralllicpr?totYl?es. \\Tiththe. optimized parameters, complicated parts were successfully fabricatedusi l1 g.bothKyocera SN282 and Starck M..11 silicon nitride powders.

No abstract

No abstract

No abstract