【正文】 To automobile being structure plicated and a existing one used in automobile collide automobile that security study calculate model too huge characteristic, is it is it at the foundation , security of research results , collide to automobile security monly used automobile collide model simplify rationally in studying to collide in existing automobile to plan, set up concise , ocular , swift , scientific automobile and simplify models. Simplifying models can adopt the model of mixing that nodal shell unit and nodal entity39。s impact on structural mechanics characteristic of the automobile struck. And the study on anticollision mechanism of semirigid guardrail , is it consider mechanics characteristic , automobile of structure to want too (whether former research automobile that set up collide model can for is it serve to study originally after dealing with), but the more important thing is that will consider the influence on course of colliding of mechanics characteristic of the semirigid guardrail , and various kinds of coupling phenomena set up through contacting interfaces between the automobile and semirigid guardrail , obviously, such research and research in the past were different. The settingup of the system intact coupling dynamics big system model is the most key question that the automobile the semirigid guardrail collides . Should consider the semirigid guardrail and one39。s own since contact , position and area are in changing contact each other), then influence the size and direction exposed to strength and frictional force , influence the sport orbit of the automobile, this kind feedback function make automobile semirigid guardrail collide system strike shape at specific coupling each other. Now, people collide structure basic principle of dynamics apply other relevant field, including the study on semirigid guardrail , but the restriction that divided because of the speciality, in design technical research of the semirigid guardrail , have not made breakthrough progress yet. Through the response characteristic analysis of the human body in the car in the course to colliding, is it collide course various kinds of sport law that automobile might appear human body bludgon the influence law responded into to car to find out, confirm in view of the above that it is most favorable to human body39。 Or regard the automobile as and have no form of geometry and the particle of the size or simple spring quality damping system, is it is it study semirigid guardrail for line elastomer semirigid designing technique of guardrail wait for such as anticollision mechanism to e to simplify at the same not already while studying considered the ball plasticity of the semirigid guardrail moves on the influence of the law to the automobile big and out of shape, consider geometry form , size and automobile car body structure of automobile play plasticity to be heavy and out of shape to semirigid guardrail heavy influence out of shape too, have not considered the emergency rate effect of the material and inertia effect are to the automobile car body structure and large influence out of shape of semirigid guardrail , have not considered the influence of each and one39。 Should also pay attention to guaranteeing the proper distance between the guardrail and barrier . The deformation when the guardrail collides is not only an important factor that the form is chosen, but also an important factor set up . When the barrier especially protected is a rigidity object, the distance between the guardrail and object should be large in order to prevent the vehicle from stumbling hindering on the rigidity object enough. Set up the side guardrail of the way to guaranteeing the function on the way with safe side is great rationally, but the diversification of the side guardrail form of the way and influence factor of establishment make the design of the side guardrail of the way very plicated numerously Guardrail as superhighway a important one safety devices most one of , can prevent vehicle from go out highway or intrude upon to to go the lane, have function of reducing accident losses , guaranteeing the traffic safety, for improving sense of safety and fortableness that the department rides personnel, it is indispensable to improve the economy of highway transportation and social benefit. The guardrail is one of the most important safety devices of expressway . According to the difference which can suck the way, the guardrail is divided into the following 3 typical forms : Rigidity guardrail , the semirigid guardrail and flexible guardrail . The function of the guardrail is: When the automobile and guardrail collide , under one39。 2)The guardrail should be able to make the vehicle reply to and stop travel direction frequently 。s receiving facilities of the serious injury. The anticollision cushion is with low costs, have very high security performance . It mainly applies from taking in the middle of not having to bringing and carrying out the transition while having, the usual friendship channelizing island shunts one, has regular barriers when the pilosity highway section of the traffic accident. The anticollision cushion has plastic cushions of systematic anticollision of intermediate layer , fill out such various forms as the sand plastic barrel anticollision cushion , sand bag ,etc.. Practice has proved , the anticollision cushion is a kind of effective facility , it is mainly serious degree which reduces the accident, but not reduce the emergence of the accident. With the rapid development of the expressway of our country, people have improved a lot understanding of the importance of safe guardrail, while building the guardrail, should pare from such many aspects as performance , view and economy ,etc. conscientiously , consider in an a