本文完成了一种吸能盒的数值模型构建。采用拉丁超立方试验设计方法获取该吸能盒各结构参数的样本点,并基于试验设计技术(Design of Experiment,DOE)的参数试验法对该吸能盒各结构参数对吸能盒缓冲性能指标,如总吸能量EA、最大碰撞力Fm...本文完成了一种吸能盒的数值模型构建。采用拉丁超立方试验设计方法获取该吸能盒各结构参数的样本点,并基于试验设计技术(Design of Experiment,DOE)的参数试验法对该吸能盒各结构参数对吸能盒缓冲性能指标,如总吸能量EA、最大碰撞力Fm、初始峰值力Fi以及平均破碎力MCF等,进行灵敏度分析。结果表明:该吸能盒的薄壁厚度、边长、折叠凹角侧边边长、折叠凹角以及折叠夹角能对吸能盒的缓冲性能产生显著影响。根据分析结果,可为吸能盒的结构设计以及缓冲性能的研究提供设计变量的择取依据,在吸能盒的结构设计领域具有一定的工程意义。展开更多
An attempt is made in the present study to obtain the relationships among process parameters and physical dimensions of AA6063 aluminium alloy coating on IS2062 mild steel obtained through friction surfacing and their...An attempt is made in the present study to obtain the relationships among process parameters and physical dimensions of AA6063 aluminium alloy coating on IS2062 mild steel obtained through friction surfacing and their impact on strength and ductility of the coating. Factorial experimental design technique was used to investigate and select the parameter combination to achieve a coating with adequate strength and ductility. Spindle speed, axial force and table traverse speed were observed to be the most significant factors on physical dimensions. It was observed that the thickness of the coating decreased as the coating width increased. In addition, the width and thickness of the coatings are higher at low and high torques. At intermediate torque values, when the force is high, the width of the coating is high, and its thickness is thin; and when the force is low, the width and thickness are low. The interaction effect between axial force(F)-table traverse speed(Vx) and spindle speed(N)-table traverse speed(Vx) produced an increasing effect on coating width and thickness, but other interactions exhibited decreasing influence. It has also been observed that sound coatings could be obtained in a narrow set of parameter range as the substrate-coating materials are metallurgically incompatible and have a propensity to form brittle intermetallics.展开更多
重复测量数据的方差分析是对同一因变量进行重复测量的一种试验设计技术。在给予一种或多种处理后，分别在不同的时间点上通过重复测量同一个受试对象获得的指标的观察值，或是通过重复测量同一个个体的不同部位或组织获得的指标的观察...重复测量数据的方差分析是对同一因变量进行重复测量的一种试验设计技术。在给予一种或多种处理后，分别在不同的时间点上通过重复测量同一个受试对象获得的指标的观察值，或是通过重复测量同一个个体的不同部位或组织获得的指标的观察值。分析前要对重复测量数据间是否存在相关性进行球形检验，若该检验结果为 P ﹥0.05，说明重复测量数据间不存在相关性，测量数据符合 Huynh - Feldt 条件，可用单因素方差分析方法处理；若检验结果 P ﹤0.05，说明重复测量数据间存在相关性，不能用单因素方差分析方法处理。展开更多
文摘本文完成了一种吸能盒的数值模型构建。采用拉丁超立方试验设计方法获取该吸能盒各结构参数的样本点,并基于试验设计技术(Design of Experiment,DOE)的参数试验法对该吸能盒各结构参数对吸能盒缓冲性能指标,如总吸能量EA、最大碰撞力Fm、初始峰值力Fi以及平均破碎力MCF等,进行灵敏度分析。结果表明:该吸能盒的薄壁厚度、边长、折叠凹角侧边边长、折叠凹角以及折叠夹角能对吸能盒的缓冲性能产生显著影响。根据分析结果,可为吸能盒的结构设计以及缓冲性能的研究提供设计变量的择取依据,在吸能盒的结构设计领域具有一定的工程意义。
文摘An attempt is made in the present study to obtain the relationships among process parameters and physical dimensions of AA6063 aluminium alloy coating on IS2062 mild steel obtained through friction surfacing and their impact on strength and ductility of the coating. Factorial experimental design technique was used to investigate and select the parameter combination to achieve a coating with adequate strength and ductility. Spindle speed, axial force and table traverse speed were observed to be the most significant factors on physical dimensions. It was observed that the thickness of the coating decreased as the coating width increased. In addition, the width and thickness of the coatings are higher at low and high torques. At intermediate torque values, when the force is high, the width of the coating is high, and its thickness is thin; and when the force is low, the width and thickness are low. The interaction effect between axial force(F)-table traverse speed(Vx) and spindle speed(N)-table traverse speed(Vx) produced an increasing effect on coating width and thickness, but other interactions exhibited decreasing influence. It has also been observed that sound coatings could be obtained in a narrow set of parameter range as the substrate-coating materials are metallurgically incompatible and have a propensity to form brittle intermetallics.
文摘重复测量数据的方差分析是对同一因变量进行重复测量的一种试验设计技术。在给予一种或多种处理后，分别在不同的时间点上通过重复测量同一个受试对象获得的指标的观察值，或是通过重复测量同一个个体的不同部位或组织获得的指标的观察值。分析前要对重复测量数据间是否存在相关性进行球形检验，若该检验结果为 P ﹥0.05，说明重复测量数据间不存在相关性，测量数据符合 Huynh - Feldt 条件，可用单因素方差分析方法处理；若检验结果 P ﹤0.05，说明重复测量数据间存在相关性，不能用单因素方差分析方法处理。
