Summary. This article describes the elastohydrodynamic simulation of the slider bearing in a bearing test rig and investigates the root cause for the phenomena observed from the rig test.
Summary. This article describes the use of a remotely controlled and smart measurement device that is applied in very harsh environments to measure vibrations inside a medium speed internal combustion engine. The developed device is exposed to oil, high temperature and vibration and is able to measure, compute and send the results simultaneously, for example, to a website monitoring tool. The key feature of this device is that the analysis of the results is done inside the device by utilizing signal processing algorithms. The method is very efficient as it enables very long measurement times due to a low power consumption. The smart data analysis makes it easy and fast to utilize the data for product development and trouble shooting.
It 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.
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