There was an innovation upsurge of the system of the endowment insurance in all over the world since the petroleum crisis and the endowment crisis had happened in 1970 ' ss each country brought forth the policy of developing the occupational pension system in succession and carried it out , and the present endowment insurance system innovation has been going on in accordance with a three pillar mode 自上个世纪70年代石油危机、社会保障危机之后,在世界范围内兴起了一场养老保险制度改革的热潮,各国纷纷推出了发展企业年金的政策主张并得以实施,现行养老保险制度都按照一个多支柱的模式进行改革。
The research on the ground load of landing gear with multi - wheels and multi - struts has been conducted for a long time and the research is quite successful at abroad . however , due to the blockage of the developed countries in technical information as well as the number of aircraft with multi - wheels and multi - landing gear keeps growing 然而,由于外国在该方面的对中国实行技术资料封锁,加之我国现有的多轮多支柱起落架飞机数量在不断增加,因此开展多轮多支柱起落架地面载荷研究有较大的实际意义。
View from the economy performance , new classical theory asserts to establish the endowment insurance based on the multiple - support pension . this approach can relax the pressure of government public economy , maintain and increase in value and improve endure of endowment insurance . the paper focus on the how to maintain and increase in value 为此,新古典学派从养老金的经济绩效角度出发,主张建立基金制、多支柱的养老保险体系,以减轻政府公共财政压力,防止出现跨代人的巨额转移,并有利于养老金的投资增值,增加养老基金的承受能力。
Now , it is worthwhile to conduct the research on the ground load of landing gear with multi - wheels and multi - struts according to the basic theories of the mechanics , the dynamics analysis model of the full - aircraft during its landing process is established in this paper 本文首先以某多轮多支柱飞机的起落架作为研究对象,应用动力学基本原理,建立了全机的着陆动力学模型。然后,通过利用大型动力学仿真软件adams对该飞机进行了对称着陆仿真,并对仿真结果进行了对比分析。