Autoregressive bispectrum characteristics of magneto-rheometer
The operating principle of measuring rheological properties of magnetorheological(MR) fluid was expounded by means of a new rheometer with double driving discs rotating at the same speed in the opposite directions. The constitutive equation of MR fluid was established with theoretical analysis from experimental data. The conventional power spectrum approach was unable to detect the existence of quadratic phase coupling for dynamic rheological measurement. Bispectrum analysis is emerging as a new powerful technique in signal processing, which can describe nonlinear coupling, restrain Gaussian noise and reserve phase component. An autoregressive(AR) model of the thirdorder cumulant, the bispectra and bispectral contours were utilized for analyzing the dynamic characteristics of the MR rheometer by merely using the sampled output torque signals when a zero mean non-Gaussian white noise interferes with the rotary disc system. The measurement and analysis process based on virtual instruments were automatically controlled by computer in this paper. The experimental and theoretical results show that rheological properties and dynamic characteristics of MR fluid can be measured with this double disc rheometer.
magnetorheogical fluid constitutive equation rheometer bispetrum
HUANG Yi-jian(黄宜坚) CHEN Bing-san(陈丙三) JIANG Yu-yan(蒋雨燕)
College of Electro-mechanical Engineering, Huaqiao University, Quanzhou 362021, China
国际会议
长沙
英文
225-228
2008-09-28（万方平台首次上网日期，不代表论文的发表时间）