Vehicle Crashworthiness Simulation Based on Virtual Design of Auto-body

Trafficaccidentshavebecomeseriousmenacesthat threatenpeopleandpropertyatanacceleratingrate,particularlyindevelopingcountriessuchasChina, Althoughthecarownershipislow,thenumberoffatalities intrafficaccidentsisrelativelyhigh.Sosafety,asoneof basicperformancesofautomobile,isattachedimportance byautomotivemanufacturersnow.In2000,CMVDR294 “Designregulationonoccupantprotectioninautomotive frontalimpact”promulgatedinP.R.Chinaisbeneficialto evaluatethepassivesafetyofautomotives. Thestructurali…     

一种改进的关联规则挖掘算法

在Apriori算法基础上，给出一个改进的关联规则挖掘算法。改进的算法只需对数据库进行一次搜索，能大量减少L／O次数，且内存开销适中。通过一组实验对两种算法进行比较，本算法尤其对大型数据库的性能优于先前已有的一些关联规则算法。     

Crashworthiness simulation and improvement design of auto-body based on finite element mehtod

One developing commercial vehicle was simulated on crashworthiness using the nonlinear finite element method. The deformation of the auto-body, the movement of the steering wheel and the dynamic responses of the occupant at the initial velocity of 50 km/h were studied. The results show that the design of the vehicle could be improved on structure and material. The frontal longitudinal beam, the main energy-absorbing part of the auto-body, was optimized on structure. The data of the simulation predict that the hinge of the engine hood would fracture during the crash. The failure of the engine hood hinge would be a danger to both the driver and passengers. Then the problem was solved by changing the engine hood and hinge on structure and material. Simulation results also show that applying new material and new manufacture techniques could improve the crashworthiness of the vehicle greatly. These improvement methods are valuable to the virtual design of vehicles.     

面向国家标准的汽车转向机构安全性仿真

国家标准《防止汽车转向机构对驾驶员伤害的规定》中规定了防止转向机构对驾驶员构成伤害的技术要求和当汽车受正面撞击时转向盘向后窜动的试验方法，转向盘遭受撞周时吸收能量的试验方法，本文以某车型及其转向机构为研究对象建立有限元模型，按国家标准规定的试验条件对两项技术要求进行计算机仿真，仿真结果与试验结果吻合，因此利用仿真技术对评价汽车转向机构碰撞安全性具有一定的指导意义。     

数字水印技术及其在电子政务中的应用

因特网的普及,多媒体数据的数字化,使得多媒体信息的交流日益广泛和深入,同时也为盗版者能以低廉的成本复制及传播未经授权的数字产品内容提供方便。根据当前电子政务的发展,本文分析数字水印技术的基本特征、分类和应用领域,提出了数字水印技术在电子政务安全领域中的应用方案。