目前，多数系统可靠型模型的建立，皆假设系统由相同的零件组成或者认为系统的所有零件承受相同的载荷。
Most reliability models are developed on the assumption that the systems consist of the same parts and all the parts bear the same load.
考虑多种载荷情况，并假设每个原有节点的质量不变。
We take into consideration multiple loading conditions and assume the mass of each existing node to be constant.
本文的基本假设与以往的“共同曲率”或“集中载荷”的假设不同，采取了这两者相结合的假设。
In this paper, the basic assumption is different from the "common curvature" and the "concentrated loading" assumptions used before, but is the combination of them both.
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