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第7期 张国芬等：SGA92150型半挂车车架的结构设计与强度和刚度分析 .749. Structure design and strength and stiffness analysis of an SGA92150 semi-trailer frame ZHANG Guofen,ZHANG Wenming,SUN Yuliang,DONG Cuiyan) 1)Civil and Environmental Engineering School,University of Science and Technology Beijing.Beijing 100083.China 2)Beijing Shougang Heavy Duty Truck Manufactory.Beijing 100043.China ABSTRACT An SGA92150 semi-trailer frame's layout,longitudinal girders,crossgirders and joints were de- signed.The stress and deformation of the frame were calculated by using Ansys Workbench software with ad- vanced method,and the force analysis and stress calculation of the longitudinal girder were carried out by using Matlab software with conventional method.The results show that the frame's strength and stiffness are enough to meet the design requirements. KEY WORDS semi-trailer:frame:structural design:strength analysis;stiffness analysis:finite element method;solid element (上接第738页) Kinetic study on the growth of ZnO nanorod array films prepared by hydrothermal method GUO Min,DIAO Peng2,WANG Xindong,CAI Shengmin) 1)Department of Physical Chemistry.University of Science and Technology Beijing.Beijing 100083.China 2)School of Materials Science and Engineering.Beihang University,Beijing 100083.China 3)College of Chemistry and Molecular Engineering,Peking University,Beijing 100871.China ABSTRACI By using a low temperature hydrothermal approach,well-aligned ZnO nanorod arrays were pre- pared on substrates,which were pretreated with colloid pretreating method in different growth periods of time.Scanning electron microscopy and X ray diffraction spectroscopy were employed to study the morphology of ZnO nanorod arrays.Kinetic studies show that the first 8 h is the most important growth period,beyond which the nanorods nearly stop growing.During the first 8h,the growth of width of Zno nanorods contains two distinct steps:a fast step within the first 1.5h,in which the nanorods tend to be short and wide,followed by a slow step,in which long rods with high aspect ratio are obtained.The length of ZnO nanorod arrays, w hich essentially represents the thickness of a homogeneous monolayer of the thin film,may be experimentally tailored to any required dimension of up to2.4m at a growth rate of approximately 5.5nmmin. KEY WORDS ZnO:nanorods:array films:hydrothermal method;kineticsStructure design and strength and stiffness analysis of an SGA92150 sem-i trailer frame ZHA NG Guofen 1）ZHA NG Wenming 1）SUN Y uliang 1）DONG Cuiyan 2） 1） Civil and Environmental Engineering SchoolUniversity of Science and Technology BeijingBeijing100083China 2） Beijing Shougang Heavy Duty Truck ManufactoryBeijing100043China ABSTRACT An SGA92150sem-i trailer frame’s layoutlongitudinal girderscrossgirders and joints were designed．The stress and deformation of the frame were calculated by using Ansys Workbench software with advanced methodand the force analysis and stress calculation of the longitudinal girder were carried out by using Matlab software with conventional method．The results show that the frame’s strength and stiffness are enough to meet the design requirements． KEY WORDS sem-i trailer；frame；structural design；strength analysis；stiffness analysis；finite element method；solid element （上接第738页） Kinetic study on the growth of ZnO nanorod array films prepared by hydrothermal method GUO Min 1）DIAO Peng 2）WA NG Xindong 1）CAI Shengmin 3） 1） Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing100083China 2） School of Materials Science and EngineeringBeihang UniversityBeijing100083China 3） College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China ABSTRACT By using a low temperature hydrothermal approachwel-l aligned ZnO nanorod arrays were prepared on substrateswhich were pre-treated with colloid pre-treating method in different growth periods of time．Scanning electron microscopy and X－ray diffraction spectroscopy were employed to study the morphology of ZnO nanorod arrays．Kinetic studies show that the first 8h is the most important growth periodbeyond which the nanorods nearly stop growing．During the first 8hthe growth of width of ZnO nanorods contains two distinct steps：a fast step within the first1∙5hin which the nanorods tend to be short and widefollowed by a slow stepin which long rods with high aspect ratio are obtained．The length of ZnO nanorod arrays which essentially represents the thickness of a homogeneous monolayer of the thin filmmay be experimentally tailored to any required dimension of up to2∙4μm at a growth rate of approximately 5∙5nm·min －1． KEY WORDS ZnO；nanorods；array films；hydrothermal method；kinetics 第7期 张国芬等： SGA92150型半挂车车架的结构设计与强度和刚度分析 ·749·