ICSV 14 Cairns • Australia 9-12 July , 2007 1 INVESTIGATION OF TORSIONAL VIBRATION CHARACTERISTICS OF MARINE DIESEL ENGINE CRANKSHAFT SYSTEM
Evaluation of the torsional vibration characteristics of a crankshaft system is indispensable to the development of marine diesel engines. It influences the selection or decision about shafting components such as the flywheel, torsional damper, generator and even modification of the crankshaft itself. In this paper, experimental and analytical investigations of torsional vibration were carried out for a newly developed marine diesel engine. The measurements were performed on various system changes e.g. engine with and without torsional damper, tuning wheel and coupling of dynamometer or generator. Based on the measurement results, analytical models were tuned to achieve better reliability. Meanwhile the sensitivity of parameters–inertia, stiffness and damping on the free vibration and torsional response-were assessed quantitatively and qualitatively. Dynamic stresses in the highly stressed area of the crankshaft were also measured under actual operating conditions with telemetry equipment. The safety factor against fatigue was evaluated with the measured stresses and compared with the analyzed ones and showed good agreement with each other.
Practical Solution of Torsional Vibration Problems
THE objective treatment of the subject of torsional vibration which has been adopted by Dr. W. Ker Wilson leads inevitably to the call for more and yet more examples of the practical solution of problems such as arise in this increasingly important branch of the designer's work. The original single-volume treatise has now been enlarged to two very substantial volumes which greatly increase the scope of the work. This at the same time gives opportunity for the re-writing of sections such as that dealing with damping devices, which has been brought up to date and now includes a separate chapter on the rotating pendulum vibration absorber.Practical Solution of Torsional Vibration ProblemsWith Examples from Marine, Electrical, Aeronautical and Automobile Engineering Practice. By Dr. W. Ker Wilson. Second edition. Vol. 2. Pp. xxi + 694. (London: Chapman and Hall, Ltd., 1941.) 42s. net.
Modeling of chemical reactors—XXIX mixing-cell model for packed bed reactors. Steady state considerations. Problems of multiplicity
Abstract The axial heat and mass transfer in tubular catalytic reactors may be described by mixing-cell model and diffusion model as well. The diffusion description yields for a strong exothermic reaction and adiabatic conditions three steady state profiles, on the other hand the mixing-cell model gives rise to more than three steady states. A simple numerical and graphical analysis for mixing-cell model is presented.