PDF
Full
Outline
In this paper，the timing transmission gear of a certain type of domestic marine 20V diesel engine is taken as the research object. Aiming at solving the problem of frequent broken teeth fault，considering the influence of various types of internal and external comprehensive excitation，the lumped parametric bending-torsion coupling dynamic model of multi-branch gear transmission shaft system of diesel engine is established. Based on Newmark step-by-step integration method，the forced vibration response is predicted，and the accuracy of the model is verified by the actual test data. Considering the influence of dynamic load，the traditional tooth root bending stress load spectrum is modified，and the strength fatigue check of the faulty gear is carried out. The results show that the peak value of the response energy at the driven timing gear of the fuel supply cam end of the diesel engine is 5.2 times that of the peak value of the response energy at the flywheel end，which indicates that the speed fluctuation at the driven gear of the timing gear is too large and the torsional vibration characteristics are poor. At this time，the bending fatigue safety factor of the tooth root is only 1.35，which is in the general reliability range and is prone to tooth breakage. Based on the engineering practice experience，the vibration optimization design scheme of the fault gear transmission system is proposed to improve the bending fatigue safety factor of the fault gear by 1.61 to ensure the safe and stable operation of the shafting. The research results reveal the mechanism of timing gear tooth breaking fault from the perspective of dynamics，provide some theoretical guidance for accurate prediction of tooth root bending stress and performance optimization，and provide theoretical support for vibration response analysis and vibration and noise reduction of diesel engine timing gear shaft system.
PDF
82
38
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
