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        An experimental investigation on the normal force behavior ofmagnetorheological suspensions

        XingLong Gong,ShouHu Xuan,YanLi Zhang,WanQuan Jiang 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.3

        In this work the normal force behavior of magnetorheological suspensions are systematically investigated. Four magnetorheological suspensions with different volume fractions (10%, 20%, 30%, and 40%) are pre\-pared and both the static and dynamic normal forces of the samples are measured by using a commercial plate-plate magneto-rheometer under constant and sweeping magnetic field. A positive normal force will be generated when the applied magnetic field exceeds a critical value. The normal force firstly increases with the increasing of magnetic field strength and then reaches a saturation value. A magnetization model is uti\-lized to represent this mechanism. The oscillatory dynamic normal forces with time are studied and their changes with shear rates are dependent on the volume fraction. Comparisons between static and dynamic normal forces show that the differences between them are dependent on the volume fraction and magnetic filed. The temperature effect on the normal force is studied and under high magnetic field the normal force would increase slightly with the increasing of temperature.

      • KCI등재

        A pendulum-like tuned vibration absorber and its application to a multi-mode system

        XingLong Gong,Chao Peng,ShouHu Xuan,Yulei Xu,Zhenbang Xu 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.11

        This paper presents the design of a pendulum-like adaptive tuned vibration absorber (ATVA) and its application to a multi-mode system. The natural frequency of the pendulum-like ATVA can be adjusted in real time by adjusting its geometric parameters. The principle and the dynamic property of the ATVA are theoretically analyzed. Based on the analysis, a prototype of the ATVA is proposed and developed. Simulations are carried out to predict the effectiveness of the ATVA when applied to the multi-mode system. The simulated results are verified by experimental studies, which are conducted on a multi-mode platform that comprises mass, isolator, and a flexible base. The results indicate that the ATVA installed on an optimized location in the system can effectively reduce vibration over a broad frequency range and can perform better than a tuned vibration absorber.

      • SCIESCOPUSKCI등재

        An experimental investigation on the normal force behavior of magnetorheological suspensions

        Guo, Chaoyang,Gong, Xinglong,Xuan, Shouhu,Zhang, Yanli,Jiang, Wanquan 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.3

        In this work the normal force behavior of magnetorheological suspensions are systematically investigated. Four magnetorheological suspensions with different volume fractions (10%, 20%, 30%, and 40%) are prepared and both the static and dynamic normal forces of the samples are measured by using a commercial plate-plate magneto-rheometer under constant and sweeping magnetic field. A positive normal force will be generated when the applied magnetic field exceeds a critical value. The normal force firstly increases with the increasing of magnetic field strength and then reaches a saturation value. A magnetization model is utilized to represent this mechanism. The oscillatory dynamic normal forces with time are studied and their changes with shear rates are dependent on the volume fraction. Comparisons between static and dynamic normal forces show that the differences between them are dependent on the volume fraction and magnetic filed. The temperature effect on the normal force is studied and under high magnetic field the normal force would increase slightly with the increasing of temperature.

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