多孔结构材料在汽车碰撞安全中的应用研究

讨论了汽车碰撞中的主要吸能元件的吸能步骤和压溃模式,从理论上阐述了填充了多孔结构材料的吸能元件在吸能上的优势。对蜂窝式和蛋盒式两种多孔结构材料的结构组成、成形技术和吸能能力进行了分析,并进一步研究了多孔结构材料在汽车保险杠、车门以及纵梁等主要安全构件中的应用,说明把多孔材料应用到汽车吸能防撞装置中是可行的,可以极大地提高整车的耐撞性。     

废塑料基复合材料粉体法综合回收技术

介绍了国内外对废塑料基复合材料回收技术的相关现状,根据废塑料基复合材料的特点采用机械粉碎、解离(大型破碎、中碎、粉碎解离)、高压静电分选的方法回收废塑料复合材料,回收金属(铝等)的纯度达99%以上;金属(铝等)回收率达99%以上;回收塑料的纯度达96%以上,接近甚至超过国外同类技术的水平。在回收过程中不使用任何化工原料,不使用水,不排放任何污染物。     

THE CRITERION FOR THE OPTIMAL SOLUTION OF AN INVENTORY SYSTEM WITH A NEGATIVE EXPONENTIAL CRASHING COST

In a recent paper, Ben-Daya and Raouf presented a continuous review inventory model in which they considered both lead time and order quantity as decision variables where the total crashing cost is denoted by a negative exponential function of the lead time. However, the solution procedure of Ben-Daya and Raouf has some drawbacks sometimes. The Newton-Raphson method with an appropriate starting point is used to improve that of Ben-Daya and Raouf. Numerical examples illustrate how the Newton-Raphson method works.     

考虑油膜与摩擦力影响的内燃机活塞—缸套撞击情形研究

在内燃机活塞－缸套磨损故障诊断中，对撞击参数的确定通常是将活塞组作为刚性整体看待。实际上，活塞环与缸壁间的摩擦力，活塞环与环槽间的摩擦力，活塞裙部与缸壁间的油膜等都对撞击过程产生影响。本文从分析活塞环－缸套润滑状态着手，建立了活塞－缸套撞击力计算模型。并以１９０Ａ柴油机作仿真算例表明：将撞击过程是否作为刚性整体撞击处理，对撞击参数影响甚大。同时，作者通过在１７５Ｆ柴油机上的实验验证了润滑油膜对撞击力的影响。     

Continuous review inventory model with controllable lead time,lost sales rate and order processing cost when the received quantity is uncertain

In practice the quantity received may not match the quantity ordered due to worker's strike, rejection during inspection, damage during transportation, human errors in counting, etc. Accordingly, the managers often must make decisions under uncertain quantity received circumstances. In this study, we investigate the continuous review inventory model with shortages include the case where the quantity received is uncertain, in which the lead time, lost sales rate and order processing cost are decision variables. Here, we consider the lead time crashing cost is an exponential function of lead time, and the order processing cost and lost sales rate are logarithmic functions of capital investment. The objective of this study is to minimize the total relevant cost by simultaneously optimizing the order quantity, lost sales rate and order processing cost. In addition, an efficient algorithm is developed to determine the optimal policy, and our approach is illustrated through a numerical example. From the results of numerical example, it can be shown that, the significant savings can be achieved through the reductions of order processing cost and lost sales rate.     

多孔结构材料在汽车碰撞安全中的应用研究

讨论了汽车碰撞中的主要吸能元件的吸能步骤和压溃模式，从理论上阐述了填充了多孔结构材料的吸能元件在吸能上的优势。对蜂窝式和蛋盒式两种多孔结构材料的结构组成、成形技术和吸能能力进行了分析，并进一步研究了多孔结构材料在汽车保险杠、车门以及纵梁等主要安全构件中的应用，说明把多孔材料应用到汽车吸能防撞装置中是可行的，可以极大地提高整车的耐撞性。