The paper deals with the weight reduction and the achievement of a more homogeneous stress distribution of a one-cylinder engine's crankshaft, developed for the Formula Student series. In order to achieve this goal, a series of static FEM analysis were performed on the crankshaft. For the FEM analyses, the critical loading and kinematic boundary conditions of the crankshaft were calculated with two different methods. The loads were determined analytically and were verified by Creo Mechanism software. The calculations were done for different engine speeds and-as a resultthe critical engine speed, where the highest loads appear could be determined. An essential weight reduction and a more homogeneous stress distribution were achieved on the crankshaft as the result of FEM analysis.

In the last decade magnetorheological (MR) clutches gained high attention because of their beneficial properties. One of the most important issues is to find ways to increase their transmissible torque. This paper summarizes first the basics of magnetorheology and focuses later on the investigation on the optimal inner radius of a MR clutch. Both a simple analytical method and a simulation procedure is presented.

The paper deals with the vibration analysis of a one-cylinder engine crankshaft. For the analysis, a sequential torsional multi-mass vibration model was created of the crank-mechanism. The natural frequencies and natural modes of the crankshaft were determined from this model. The results of the torsional model were verified with a 3D finite element model, which consists of not only the torsional, but every other natural frequency and mode of the crankshaft. From the torsional natural frequencies and the harmonic expansion of the excitation forces, the critical speeds were determined, where resonance phenomena can occur. The relative angular deflection of the two ends of the crankshaft was also determined which characterizes the torsional stiffness of the crankshaft. From the angular velocity function of the clutch, the measure of speed irregularity of the clutch was defined.

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