摘要
以直列4缸机和V型6缸机为原型,采用分析模态贡献因子的方法对2类机体箱体的结构在多点正弦激励下的动响应进行研究,得到各阶模态振型对结构动响应的贡献因子,找到对结构动响应贡献最大的模态振型。通过改变此阶模态的模态参数来改善结构的振动特性,并对比了结构改进前后的振动烈度。通过2个有限元算例证实了主导模态法在箱体类结构设计与改进方面的可行性与优越性。研究结果表明:结构改进后,直列4缸机箱体类结构的质量减轻了1.5%,振动烈度的最大值下降了8.5%;V型6缸机箱体类结构的质量减轻了3.1%,振动烈度的最大值下降了13.6%,并无需再对各阶模态参数逐一进行分析,减小了工作量。
Mode contribution factors were analyzed to research dynamic response for two kinds of diesel engine blocks, in-line four cylinder and V-type six cylinder engine blocks, under multi-support sine excitation. Contribution factors of structural dynamic response in type of greatest contribution to the structural dynamic response w two kinds of structures were improved by changing dominant mode of dominant mode analysis method in designing and improving th contrasting the vibration intensities before and after structural calculation examples. After structural improvement,mass and vibra line four cylinder engine is reduced by 1. 5 13.6% separatly. The workload is diminished each order mode and the modal vibration ere found. Vibration characteristics of the parameters. The feasibility and superiority e structure like solid boxes is proved by improvement using two finite element tion intensity of solid box structure and 8. 50%, and for V-type six cylinder engine by 3. 1 for not needing to analyze each order mode parameters. for in and13.6%separatly. The workload is diminished for not needing to analyze each order mode parameters.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2013年第5期24-28,共5页
Chinese Internal Combustion Engine Engineering
基金
国防基础研究项目(4010205)
关键词
内燃机
多点正弦激励
贡献因子
机体
动响应
振动烈度
IC engine
multi-support sine excitation
contribution factor
block
dynamic response
vibration intensity
