Finite element method modeling of crankshaft axial impact measurements
Avainsanat:Impact, crankshaft, strain wave, data analysis, Explicit FEM, Wärtsilä
AbstraktiIt has been recently discovered that there is a periodical axial impact phenomenon in a running engine crankshaft. Bending of the shaft causes signiﬁcant extension of the crankshaft and impact to the engine block through the axial thrust bearing. The aim of this work is to study impact-induced energy ﬂuctuations in a complex-shaped Wärtsilä sixteen vee 32 engine crankshaft by using an explicit ﬁnite element method (FEM) during the ﬁrst 25 ms after impact. Using the FEM allows us to study real components used in industry, and analyze their dynamics in the transient phase. In conclusion, we found interesting results that can be used as guidelines for a full-scale crankshaft measurement instrumentation plan. The full-scale measurements will be performed later in the Wärtsilä Oy facility at Vaasa, Finland. The main ﬁnding is that a substantive amount of energy is trapped in the head region and the ﬁrst two crank pins of the crankshaft, which can aﬀect crankshaft durability regarding high-cycle fatigue.
Copyright (c) 2020 Antti-Jussi Vuotikka, Marko Jokinen, Pasi Halla-aho, Jukka Aho, Antti Mäntylä, Tero Frondelius
Tämä työ on lisensoitu Creative Commons Nimeä 4.0 Kansainvälinen Julkinen -lisenssillä.