﻿ 柴油机缸盖应力与缸内压力关系仿真研究

# 柴油机缸盖应力与缸内压力关系仿真研究Simulation Study on the Relationship between Cylinder Head Stress and Cylinder Pressure

Abstract: Using the strain effect of the cylinder head, the internal deformation of the cylinder head structure is converted to the concrete value, and the strain of the dynamic state is measured by applying pressure load to the cylinder head of the diesel engine. Based on the simulation study of 6135 diesel engine cylinder pressure on cylinder head strain in different positions, this paper discusses the diesel engine cylinder head for different explosion pressures in cylinder and its stress distribution, and gets the best test point. By measuring the stress inversion of explosion pressure in cylinder diesel engine cylinder head, it discovers diesel engine cylinder pressure fault in time, to avoid more accidents. To some extent, it can provide reference for the single cylinder pressure test of all kinds of diesel engines.

1. 引言

2. 应变片测量柴油机单缸压力原理及应变片粘贴位置

1、6135柴油机缸体压力与缸盖所受应力关系分析及模型边界条件和载荷的定义

Figure 1. Cylinder head calculation assembly drawing

Figure 2. Cylinder head force diagram

2、6135缸盖应变仿真研究

Figure 3. The overall Mises stress distribution diagram of 6135 cylinder head

Figure 4. 6135 Cylinder head stress test point

3、仿真结果

Figure 5. The pressure changes in two cylinders

Figure 6. The Mises stress response curve at each point of the cylinder 1

Figure 7. The Mises stress response curve at each point of the cylinder 2

Figure 8. Pressure change of cylinder 1

Figure 9. Pressure change of cylinder 2

3. 应变片的电测原理及具体粘贴方式

1、应变片电测原理

Figure 10. The Mises stress response curve at each point of the cylinder 1

Figure 11. The Mises stress response curve at each point of the cylinder 2

2、应变片粘贴方式

Figure 12. Half-bridge temperature compensation circuit

Figure 13. Strain slice pasting schematic

4. 结论

1) 6135柴油机缸盖受到气缸内部压力冲击时，螺栓孔附近受到的应力变化最为明显。

2) 通过仿真曲线得知，缸盖顶部应力与缸内压力变化趋势完全一致。当同一缸盖，相邻两个气缸发火顺序不一致时，低压处的应变趋势会受到相邻气缸影响。应力峰值出现时刻与爆发压力出现时刻一致。

3) 通过对柴油机缸盖各典型位置进行仿真，得出图4中1-3、2-3为应力变化最为明显，适合作为后续缸盖应力测试实验测量点。图4中1-6、2-6处适合作为实验测试时的温度补偿点，避免热应力对与实际测量的机械应力造成的误差。

NOTES

*通讯作者

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