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Full-Text Articles in Mechanical Engineering
Observation Of Laser Ignition And Combustion Of Pulverized Coals, John C. Chen, Masayuki Taniguchi, Kazuyuki Ito
Observation Of Laser Ignition And Combustion Of Pulverized Coals, John C. Chen, Masayuki Taniguchi, Kazuyuki Ito
Mechanical Engineering
Direct observation of pulsed-laser ignition and combustion of pulverized coals with a high speed video has been made. A dilute stream of particles was dropped into a laminar, upward-flow wind tunnel with a quartz test section. The gas stream was not preheated. A single pulse from a Nd:YAG laser was focused through the tunnel and ignited several particles. The transparent test section and cool walls allowed for optical detection of the reaction sequence. The ignition and combustion behaviours of amorphous carbon spheres and an anthracite were as expected for heterogeneous ignition and reaction. Surprisingly, the reaction of a high volatile …
Optimization Of Expanded Polypropylene Foam Coring To Improve Bumper Foam Core Energy Absorbing Capability, Gregory Frederick, Gregory A. Kaepp, Conrad M. Kudelko, Peter J. Schuster, Friedrich Domas, Udo G. Haardt, Werner Lenz
Optimization Of Expanded Polypropylene Foam Coring To Improve Bumper Foam Core Energy Absorbing Capability, Gregory Frederick, Gregory A. Kaepp, Conrad M. Kudelko, Peter J. Schuster, Friedrich Domas, Udo G. Haardt, Werner Lenz
Mechanical Engineering
To design a cost, weight, and energy efficient bumper foam energy absorber, it is important to consider optimizing the shape of coring employed in the design of the system. In this paper, a number of foam coring patterns are studied by both empirical and analytical methods. The size and shape of proposed core designs are studied in detail with consideration given to several different densities of expanded polypropylene (EPP) foam. Using the finite element method of structural analysis, it is possible to have an inside look at the stress distribution during deformation of foam structures. An optimization study using the …