Abstract
Diesel engine anti-shock performance is important for navy ships. The calculation method is a fast and economic way compared to underwater explosion trial in this field. Researchers of diesel engine anti-shock performance mainly use the spring damping model to simulate the main bearings of a diesel engine. The elastohydrodynamic lubrication method has been continuously used in the main bearings of diesel engines in normal working conditions. This research aims at using the elastohydrodynamic lubrication method in the main bearings of the diesel engine in external shock conditions. The main bearing elastohydrodynamic lubrication and diesel engine multi-body dynamics analysis is based on AVL EXCITE Power Unite software. The external shock is equivalent to the interference on the elastohydrodynamic lubrication calculation. Whether the elastohydrodynamic lubrication algorithm can complete the calculation under interference is the key to the study. By adopting a very small calculation step size, a high number of iterations, and increasing the stiffness of the thrust bearing, the elastohydrodynamic lubrication algorithm can be successfully completed under the external impact environment. The calculation results of the accelerations on engine block feet have a similar trend as the experiment results. Diesel engines with and without shock absorbers in external shock conditions are calculated. This calculation model can also be used for diesel engine dynamics calculations and main bearing lubrication calculations under normal working conditions.
Highlights
The research of shipboard equipment anti-shock performance can be divided into two methods: shock tests and calculations
The external shock is equivalent to the interference on the elastohydrodynamic lubrication calculation
This research aims at using a elastohydrodynamic lubrication method in the main bearings of the diesel engine in external shock conditions
Summary
The research of shipboard equipment anti-shock performance can be divided into two methods: shock tests and calculations. The aim of calculation method is to calculate the impact environment of shipboard equipment through the mathematical and mechanical models to obtain the equipment dynamic characteristics and predict its antishock performance. This method is cheap in cost, short in time, and easy to repeat. Diesel engines are commonly used power equipment on ships. As a machine with multiple moving parts and complex contact relationships between moving parts, the diesel engine should be investigated for an appropriate calculation method [2,3,4,5]
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