Abstract: The strength and fatigue life of the bolted base of the marine diesel generator sets are analyzed to ensure its long-term operation reliability. The static strength of the bolted base is calculated based on the finite element modeling of the bolted base. The strength of the base bolts are calculated based on the VDI 2230 standard. The response vibration characteristics of the bolted case under the operating conditions are calculated to analyze its fatigue life according to the base load in the actual vibration test and the rated load. The results show that the static strength of the bolted base calculated by the finite element method meets the requirements, and the bolt strength calculated by the VDI 2230 standard also meets the requirements. The response calculations based on the two methods show that the bolted base will not experience fatigue failure during the 20-year safe operation period.

Key words: marine diesel generator set, bolt strength calculation, VDI 2230 standard, finite element method (FEM), fatigue life

摘要： 为了保证船用柴油发电机组螺栓连接基座长期运行的可靠性,需对基座强度和疲劳寿命进行分析研究,并对螺栓连接基座进行有限元建模,计算螺栓连接基座静强度。该文基于VDI 2230标准对基座螺栓进行强度计算,依据实际振动测试基座载荷和额定工况载荷,分别计算螺栓连接基座在运行工况中的响应振动特性,分析其疲劳寿命。结果表明：有限元计算螺栓连接基座静强度满足要求;基于VDI 2230标准计算的螺栓强度满足要求。根据两种方法响应计算表明：20年的安全运营期内,螺栓连接基座均不会发生疲劳失效。

关键词: 船用柴油发电机组, 螺栓强度计算, VDI 2230标准, 有限元方法, 疲劳寿命