﻿ 船舶柴油机活塞失效检测技术
 舰船科学技术  2022, Vol. 44 Issue (16): 97-100    DOI: 10.3404/j.issn.1672-7649.2022.16.019 PDF

1. 江苏海事职业技术学院，江苏 南京 211170;
2. 大连捷华船舶科技有限公司，辽宁 大连 116113

Research on failure detection technology of marine diesel engine piston
SUN Chang-fei1, LIU Zhao-liang1, LI Geng-tian2
1. Jiangsu Maritime Institute, Nanjing 211170, China;
2. Dalian Jiehua Marine Technology Co.Ltd., Dalian 116113, China
Abstract: On ships, diesel engines play an indispensable role. The main engine provides propulsion power for the normal running of the ship, and the auxiliary engines can drive equipment such as generators, air compressors, and water pumps. If the diesel engine is abnormal, it will adversely affect the navigation of the ship. Piston is one of the important components of a diesel engine. The piston often fails. Effective methods should be taken to detect the failure of the piston to find out the cause of the failure. Optimizing and improving, reducing and eliminating the occurrence of failure problems, and improving the operational reliability of marine diesel engines are of great significance to ensure the safe and stable navigation of ships.
Key words: ship     diesel engine     piston     finite element analysis     detection
0 引　言

1 船舶柴油机活塞失效分析

1.1 外观检查

 图 1 船用柴油机活塞裂纹延伸至外圆示意图 Fig. 1 Schematic diagram of piston crack extending to the outer circle of marine diesel engine

 图 2 船用柴油机活塞裂纹的扩展情况示意图 Fig. 2 Schematic diagram of crack propagation in piston of marine diesel engine

1.2 材料性能

1.3 失效原因

2 船舶柴油机活塞失效检测技术

2.1 确定柴油机活塞的热边界条件

 $f(r,\phi ,z) = T \text{。}$

 ${q^{''}} = - k\frac{{{\text{δ}} T}}{{{\text{δ}} n}} \text{。}$

 $- k\frac{{{\text{δ}} T}}{{{\text{δ}} n}} = h(T - {T_0}) \text{。}$

 图 3 船用柴油机活塞径向路径1温度变化曲线示意图 Fig. 3 Schematic diagram of temperature change curve of piston radial path 1 of marine diesel engine

 图 4 船用柴油机活塞径向路径2温度变化曲线示意图 Fig. 4 Schematic diagram of temperature change curve of piston radial path 2 of marine diesel engine

 图 5 船用柴油机活塞径向路径3温度变化曲线示意图 Fig. 5 Schematic diagram of temperature change curve of piston radial path 3 of marine diesel engine

 图 6 船用柴油机活塞径向路径4温度变化曲线示意图 Fig. 6 Schematic diagram of temperature change curve of piston radial path 4 of marine diesel engine
2.2 活塞建模

2.3 活塞温度场计算

 图 7 阀坑附件与未开阀坑区域外圆温度的对比情况示意图 Fig. 7 Schematic diagram of the comparison of the outer circle temperature of the valve pit accessories and the unopened valve pit area

2.4 活塞应力场计算

2.5 活塞优化

3 结　语

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