基于有限频域参数的粘弹性润滑剂的参数辨识  

System Identification on Viscoelastic Lubricant with Finite Frequency Parameters

作　　者：李疆[1] 余必强[1] 陈皓生[2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]清华大学摩擦学国家重点实验室,北京100084

出　　处：《润滑与密封》2007年第3期96-98,102,共4页Lubrication Engineering

基　　金：教育部重点项目(106018);北京科技大学校基金项目(20050312290);国家自然科学基金项目(50505020)

摘　　要：采用频域的传递函数表征粘弹性润滑剂的特征,粘弹性润滑剂的剪切粘度和第一正应力差通过传递函数中的2个特征参数自然频率和阻尼比表征,待测润滑剂的这2个参数可以通过系统辨识的方法获得。对1%的羟乙基纤维素(HEC)水溶液的实验表明,辨识获得的传递函数描述的粘弹性介质特征粘度变化和第一正应力差变化与RS300流变仪测量所得的实验数据吻合。Transfer function in frequency-domain was investigated to specify some simple viscoelastic lubricants＇ behavior. Rheological properties of the lubricant such as shear dependent viscosity and the normal stress difference were characterized by two parameters in transfer functions, natural frequency and damping ratio. System identification method was adopted to determine the two parameters and it was applied to identify properties of some unknown fluid. Experiment on 1% hydroxyethyl-cellulose water solution shows that the identified transfer function copes with the experiment data, and fluid rheological properties can be well described by the two parameters in frequency domain.

关 键 词：粘弹性 系统辨识 润滑剂 频域分析 

分 类 号：TH117[机械工程—机械设计及理论] O357[理学—流体力学]