作者简介：胡庆安(1956-),男,江苏南京人,副教授,E-mail:hqa@gl.chd.edu.cn.
作者单位：胡庆安（长安大学,公路学院,陕西,西安,710064）
程侠（长安大学,公路学院,陕西,西安,710064）
邰卫华（密歇根大学,机械工程系,密歇根,迪波,48126）
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