摘要
为在系统动力学仿真中动态表达不同工况下工程机械液压元件所受剧烈变化的不确定性载荷,提出一种液压元件载荷集总参数动态响应模型。针对液压元件所受非平稳随机循环载荷,采用小波分解法将其分解为趋势项与随机项,其中非平稳的趋势项用经现场试验数据标定的集总参数模型进行表达,平稳的随机项根据能量等价原则用随机谐和函数进行表达,并由两者合成得到载荷模型;然后以某型液压挖掘机回转载荷为实例,建立了回转马达的载荷模型,对比某工况下载荷模型的响应与现场试验数据,证明了该载荷模型搭建方法的可行性和有效性。研究结果表明:该载荷集总参数动态响应模型能实现不同工况下液压元件载荷的动态表达,有助于改善工程机械液压系统动力学仿真对复杂多变工况的适应性。
To dynamically express the uncertain loads of hydraulic components of construction machinery under different working conditions in system dynamics simulation,a lumped parameters dynamic response model of hydraulic component load is proposed.For the non-stationary random cyclic load of hydraulic components,the wavelet transform method is used to decompose it into a trend term and a random term.The non-stationary trend term is expressed by a lumped parameter model calibrated by data from field tests,and the stable random term is expressed by a random harmonic function based on the principle of energy equivalence,and the load model is synthesized by the above two terms.Then,taking rotary load of a certain type of hydraulic excavator as an example,the load model of the rotary motor is established and the response of the load model is compared with the field test data under a certain working condition to prove the feasibility and effectiveness of the load model construction method.The research results show that the lumped parameter dynamic response model can realize the dynamic expression of the hydraulic component loads under different working conditions,which helps improve the adaptability of the hydraulic system dynamic simulation of construction machinery to complex and variable working conditions.
作者
李晓田
邹博文
王安麟
LI Xiaotian;ZOU Bowen;WANG Anlin(School of Mechanical Engineering,Tongji University,Shanghai 201804,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2021年第5期56-64,共9页
Journal of Xi'an Jiaotong University
基金
国家重点研发计划资助项目(2018YFC 0810200)。
关键词
工程机械
载荷
系统动力学仿真
小波分解
集总参数
construction machinery
load
system dynamics simulation
wavelet decomposition
lumped parameter
