Analysis of Connecting Rod Fracture of High-Speed Supercharged Diesel Engine
Abstract
High-speed supercharged diesel engines are widely used in various vessels for powering, ranging from low-power fleet boats to high-end yachts. But accidents caused by the fracture of connecting rods have occurred in recent years. This paper analyzes the cause of the fracture of the connecting rod of high-speed supercharged diesel engine and puts forward corresponding preventive measures.
Key Words: High-speed supercharged diesel engine, connecting rod fracture
1 Introduction
High-speed supercharged diesel engines are widely used in various vessels for powering, ranging from low-power fleet boats to high-end yachts. With its high power, stable performance and long life, the high-speed supercharged diesel engine has become the most preferred engine in the field of ship power. However, the power is so large that accidents caused by the fracture of connecting rods have occurred from time to time. The fracture of the connecting rod not only damages the high-speed supercharged diesel engine itself, but also brings great danger to the safety of the voyage, so it is necessary to analyze and prevent the fracture of the connecting rod in order to ensure the safety of the voyage.
2 Analysis of Causes
2.1 Improper Stress Adjustment
High-speed supercharged diesel engines are sensitive to the adjustment of tension, and in the installation or adjustment of tension of the connecting rod, the tension is too large, resulting in excessive stress and excessive load on the connecting rod. The connecting rod will be in a state of overload, and the fatigue fracture will occur after a long period of time, resulting in the fracture of the connecting rod.
2.2 Poor Assembly Quality
For the assembly of the connecting rod, if there is a burr on the edging and the machining accuracy is not up to standard, local chips may be generated on the surface of the connecting rod, causing improper stress concentration and resulting in fracture of the connecting rod.
2.3 Improper Operating Parameters
During the operation of the high-speed supercharged diesel engine, the wrong operation parameters or wrong oil supply pressure will cause greater structural stress on the connecting rod, and the connecting rod will break due to overstress. In this regard, it is necessary to ensure that the operating parameters of the high speed supercharged diesel engine are in line with the requirements of the operating instructions and regularly check the lubricating oil pressure.
2.4 Defects of Materials
In some cases, when the engine is running at high speed and under high load, the connecting rod material has the possibility of melting or melting, which will cause the internal microstructure of the material to change and weaken its strength, failing to withstand the stress and resulting in fatigue fracture or sudden rupture of the connecting rod.
3 Conclusion
The fracture of the connecting rods of high-speed supercharged diesel engine not only brings great danger to the safety of the voyage, but also has a great impact on the operation of the vessel. Therefore, the fracture of the connecting rods must be prevented to ensure the safety of the voyage. In the installation of the connecting rod, the tension must be adjusted according to the requirements, the assembly quality must be strictly controlled to ensure that no burr remains on the edging, the operation parameters must be in line with the requirements of the operating instructions, and the materials used for the connecting rod must be ensured to be qualified, so as to ensure the safety of the voyage.
4 References
[1] Li Yan. Research on the Failure Analysis of Connecting Rods in High-speed Supercharged Diesel Engines[J]. Engineering Research, 2019(004):124--129.
[2] Wang Ying. Research on High-speed Supercharged Diesel Engines[M]. Beijing: Science Press, 2019:98-145.
