Analysis on Diesel Engine Crankshaft Performance and Optimization

The power units of diesel generator sets are mainly diesel engines. Despite the continuous updating of equipment leading to the application of different types of diesel engines, Yuchai, Cummins, Shangchai, and Perkins series diesel engines remain among the commonly used models at present. How to extend the service life of diesel engines and save costs has become crucial, and the management and maintenance of diesel engine parts have an impact on prolonging the service life of diesel engines.

In modern diesel generator set maintenance management, to ensure the safe and reliable operation of diesel generator sets, this article introduces that measuring, monitoring, and maintaining diesel engine parts is of great significance for improving their service life and saving maintenance costs.

Currently, diesel engine parts for generator sets mainly include: four matching sets, engine block, crankshaft, cylinder head, valves, filters, air filters, cylinder gaskets, etc. At present, Weifang Huakun Diesel Engine Company sells all these parts involved in various diesel engines and diesel generator set parts. As the country advocates clean energy and conservation, the diesel engine parts produced by Huakun meet national energy-saving standards.

The crankshaft is an important component of a diesel engine, and the simulation calculation of the crankshaft is a very important research field. This paper calculates and analyzes the static performance and dynamic characteristics of the crankshaft, uses experimental optimization technology to improve the design of the crankshaft, and conducts experimental comparisons of various schemes. The important influencing factors under the test indicators are obtained, providing a certain basis and feasible plan for future crankshaft design research.

For the static analysis of the diesel engine crankshaft, the strength calculations of the single crank and the integral crankshaft are carried out respectively. The correctness and feasibility of the crankshaft finite element model and boundary conditions are verified, and the stress cloud diagram consistent with the actual situation is obtained. The safety factor of the crankshaft is calculated using the Goodman method and the traditional fatigue strength method respectively. For the improved design of the crankshaft, diesel engine parts use finite element analysis and experimental optimization technology to discuss the influence of crank width, main shaft diameter, axial depth of the unloading groove, and fillet radius at the unloading groove on crankshaft strength, and obtain an effective way to improve crankshaft strength.

Through optimization, it is found that among the six factors, the main shaft diameter and the vertical distance from the upper part of the unloading groove to the crankshaft centerline have a significant impact on the crankshaft strength. Taking the maximum stress value of the crankshaft crank as the objective function, the optimal plan for the original crankshaft improvement is obtained, and the confidence interval is given.

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