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Wednesday, July 10 • 12:30 - 12:50

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One very important design parameter for mining machinery is the life length and durability of the machine. Epiroc produces mining machines with a long history to deliver durable machines. One critical parameter for the fatigue life of the machines are the structural dynamic behavior, i.e. significant vibration forces coming from the power generation, transport of the machine and the mining process itself will excite the structure. Many of these forces are normally considered as broadband and can be described either as tonal spectrums with high amounts of harmonics or as broadband noise, all depending on what source that is active. Throughout the design process it is important to study effects on the allowable stress levels coming from changes in these forces. Transfer path analysis, as it is normally used, is an effective method to study effects on noise and vibration level coming from changes in vibrational forces. However, taking the same methodology studying the maximum von Mises stresses as receiver is not very commonly used. This approach demands that the transfer functions, or parts of, are determined numerically in order to define the path to the maximum stress levels. One approach on finding suitable receivers is to define a one receiver at the point where maximum stress occurs for each mode, i.e. the number of receivers will be equal to number of modes found. The transfer functions to stress can then in its turn be used in combination with measured transfer paths. The forces applied can be extracted using the standard method available in the TPA methodology like for example invers matrix method or mount stiffness method. This paper discuss pros and cons taking this approach to evaluate changes in stress levels coming from changes in applied forces and/or sub structures in the force path.

avatar for Mohammad Rafiee

Mohammad Rafiee

Postdoctoral Fellow, Polytechnique Montréal
Mohammad Rafiee received his Ph.D. degree in Mechanical Engineering from the University of Ottawa in 2018. Currently, he is a Postdoctoral Fellow at Polytechnique Montreal in Canada. His research interests are primarily focused on the development of advanced composite materials, smart... Read More →


Wednesday July 10, 2019 12:30 - 12:50 EDT
St-Laurent 8
  T07 Struct. dyn. & nonlin. vib., RS05 Fatig fractr & jnt interf

Attendees (5)