Development of Vehicle Body Structure Having Maximum Shock Energy Absorption Ability

(1)开发吸收能量最大化的优化设计系统利用试验设计、方差分析、响应面逼近和数学规划等技术，开发了一种高效的、无灵敏度的高度非线性结构性能优化新技术。通过对基本耐撞性数值算例的应用，验证了该方法的有效性。(2)圆柱和方管的动态破碎吸能最大化方法将所开发的方法应用于圆柱和方管在质量和平均破碎力约束下的动态破碎吸能最大化设计问题。数值结果表明，在不发生柱屈曲的情况下，尽可能增加柱厚，减小柱半径和边长，可以达到最大的吸能效果。研究了加筋对吸能的影响，发现加筋可以降低平均破碎力，控制破碎形态。(3)吸能效应破碎实验对铝圆柱进行破碎实验，直接测量吸能，并与数值模拟结果进行对比。提出了一种新的车身结构，以吸收更多的破碎能量，防止乘客受伤。

(1) Development of Optimum Design System for Absorbing Energy MaximizationA efficient new technique for structural optimization of highly nonlinear structural behavior is developed by using the technique of design-of-experiment, analysis of variance, response surface approximation and mathematical programming, without sensitivities. The validity of the developed technique is confirmed by applying to basic numerical examples of crashworthiness.(2) Maximization of Dynamic Crushing Energy Absorption of Cylinder and Square TubesThe developed technique has been applied to the maximization design problems of dynamic crushing energy absorption of cylindrical and square tubes under mass and mean crushing force constraints. From the numerical results, maximum energy absorption is attained by increase the thickness and decrease the radius and edge length as much as possible without column bucking. The effect of stiffeners to the energy absorption was also studied, and it is found that the stiffener can reduce the mean crushing force and control the crushing patterns.(3) Crushing Experiment of Energy Absorption EffectAluminum cylinders were crushed experimentally, and the absorbing energy is measured directly and compared with the results of numerical simulation. A new type of vehicle body structure is also suggested to absorb much crushing energy to prevent passengers from injury.