By William Green
Air foreign - Vol 26 No 6 --- Язык: EnglishГод издания: 1984Количество страниц: 30x2Формат: pdf (175 dpi) 2821x1911Размер: 35.6 mb quick Ifolder zero
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1992). Measurement of whole body vibration of the seated operator of off-highway work machines. SAE J1013, Society of Automotive Engineers, Warrendale, PA. , et al. (2003). Robust disturbance attenuation for discretetime active fault tolerant control systems with uncertainties. Optimal Control Applications and Methods 24: 85–101. D. (2006). Limit cycle behavior of smart fluid dampers under closed loop control. Journal of Vibration and Acoustics, Transactions of the ASME 128(4): 413–428. , et al.
In this model, the hysteresis loop is divided into two regions: positive acceleration (lower loop) and negative acceleration (upper loop), which can be fitted by the 22 Handbook of vehicle suspension control systems polynomial with the power of piston velocity. Thus, the damping force of the MR damper can be written as fMR ¼ 9 X ai vi i ¼ 0, 1 . . , 9 ð1:41Þ i¼0 The coefficient ai can be linearly approximated with respect to the input current as follows: ai ¼ bi þ ci I, i ¼ 0, 1, . . , 9. Therefore, the damping force can be expressed by fMR ¼ 9 X ðbi þ ci IÞvi ð1:42Þ i¼0 where the coefficients bi and ci are obtained from the fitness of experimental data.
Therefore, the polynomial model is adopted in our prior work, which was firstly proposed by Choi et al. , which provided a convenient and effective choice to calculate the desirable damping force in an open-loop control system. In this model, the hysteresis loop is divided into two regions: positive acceleration (lower loop) and negative acceleration (upper loop), which can be fitted by the 22 Handbook of vehicle suspension control systems polynomial with the power of piston velocity. Thus, the damping force of the MR damper can be written as fMR ¼ 9 X ai vi i ¼ 0, 1 .