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作者机构:Aristotle Univ Dept Mech Engn Thessaloniki 54124 Greece Univ Thessaly Dept Mech & Ind Engn Volos 38334 Greece
出 版 物:《JOURNAL OF VIBRATION AND CONTROL》 (振动与控制杂志)
年 卷 期:2003年第9卷第3-4期
页 面:337-359页
核心收录:
学科分类:07[理学] 0802[工学-机械工程] 0801[工学-力学(可授工学、理学学位)] 0702[理学-物理学]
主 题:parametric identification fault detection vehicle nonlinearities optimal sensor configuration
摘 要:A statistical system identification methodology is applied for performing parametric identification and fault detection studies in nonlinear vehicle systems. The vehicle nonlinearities arise due to the function of the suspension dampers, which assume a different damping coefficient in tension than in compression. The suspension springs may also possess piecewise linear characteristics. These lead to models with parameter discontinuities. Emphasis is put on investigating issues of unidentifiability arising in the system identification of nonlinear systems and the importance of sensor configuration and excitation characteristics in the reliable estimation of the model parameters. A methodology is proposed for designing the optimal sensor configuration (number and location of sensors) so that the corresponding measured data are most informative about the condition of the vehicle. The effects of excitation characteristics on the quality of the measured data are systematically explored. The effectiveness of the system identification and the optimal sensor configuration design methodologies is confirmed using simulated test data from a classical two-degree-of-freedom quarter-car model as well as from more involved and complete vehicle models, including four-wheel vehicles with flexible body.