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Simplified estimate of fatigue damage based on dynamic analysis

Dekys V., Kriska P, Lietava L., Kopas P., Stalmach O.

Zeszyty Naukowe. Transport / Politechnika Śląska

2018

z. 99

15--23

The article presents a procedure for vibration analysis of the device based on measured data in simulated operating modes. Subsequently, the criterion of fatigue damage is formulated because this mechanism can be induced or accelerated by recognized operating deflection shapes. The criterion is used to select an optimal set of control device parameter values, which control each device’s operating modes and transitions between these modes and affect the excitation of the frame vibration due to possible shocks in the system. The criterion is formulated based on the vibration displacement processing from these dynamic measurements, the modified Goodman and Palmgren-Miner rules, and the results of static computational analyse. This criterion compares the effect of damage to the modes that control these sets of parameters, while the selection of the optimal control set is performed. At the end of the article, the limitations resulting from the simplifications used are described. The application of this procedure is also useful, for example, when further data are obtained by subsequent experimental stress-strain analysis methods and when we want to reduce the number of possible operating modes by which we carry out subsequent measurements among the most damaging modes.

The use of the ODS method for the estimation of the influence of external forces on the vibrations of chosen objects

Idziak P., Dembiński M.

Poznan University of Technology Academic Journals. Electrical Engineering

2007

No 53

43-50

The paper deals with the problems of the use of an object-oriented software in selected jobs of electrical engineering. Basic elements of object-oriented software are characterized, with presentation of feasibility of using the UML-Language and design patterns with the view to improve the quality of the developed software. As an example a solution to the problem of determining the current density distribution in the conductors of rectangular and circular cross-sections was presented, for the case of harmonic excitation. The integral Fredholm equation of the 2nd kind and the collocation method were used for this purpose. In summary, the conclusions were formulated that result from application of the object-oriented programming technology to solving the electrical engineering problems.