摘要
为解决柴油发电机组对不同类型和功率发电机的连接套与隔振系统刚度匹配问题,提出以广义弹性力做功为基础的能量解耦法来量化刚度匹配对双层隔振系统固有特性的影响.基于某内燃动力总成双层隔振系统建立3自由度和18自由度动力学模型进行分析.结果表明:3自由度模型能够反映系统耦合的主要特点,机组弹性模态频率与低阶刚体振动模态频率比大于2.96时可以降低刚体振动对弹性模态的影响;考虑惯性耦合和弹性耦合后,18自由度模型对应的频率比应大于4.10才可以显著降低该振动耦合.同一柴油机匹配不同惯性参数的发电机,均可参考小惯性参数发电机隔振设计时对应的频率比和刚度比进行双层隔振系统刚度匹配.
In order to solve the problem of stiffness matching between the connecting sleeve and the vibration isolation system when a diesel engine is matched with different types and power generators,an energy decoupling method based on the work done by generalized elastic forces was proposed to quantify the effect of stiffness matching on the natural characteristics of the vibration isolation system.Based on the design of a double-layer vibration isolation system for an internal combustion powertrain,3 degree-of-freedom and 18 degree-of-freedom dynamics models were established for analysis.The study result shows that the 3 degree-of-freedom model can reflect the main coupling characteristics of the system.The influence of rigid body vibration on the elastic modal can be reduced by improving the ratio of the elastic modal frequency of the powertrain to the low-order rigid body vibration modal frequency as it is greater than 2.96.Considering inertial coupling and elastic coupling of 18 degree-offreedom dynamics models,the corresponding frequency ratio should be greater than 4.10 to significantly reduce the vibration coupling.The same type of diesel engine matched with various inertia parameters of generators can refer to the corresponding frequency ratio and stiffness ratio for vibration isolation of generators with small inertia parameters to achieve stiffness matching.
作者
宋世哲
黄燕
董大伟
闫兵
Song Shizhe;Huang Yan;Dong Dawei;Yan Bing(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2024年第2期176-184,共9页
Transactions of Csice
基金
国家自然科学基金资助项目(51875482,52305134)
四川省自然科学基金资助项目(2022NSFSC0416).
关键词
柴油机
双层隔振系统
刚度匹配
固有特性
内燃动力总成
diesel engine
double-layer vibration isolation system
stiffness matching
natural characteristics
internal combustion powertrain
