提出了组合弹簧分层地应力模型，并推导了相应公式，为分层地应力解释奠定了基础。
In order to complete the single-layer-based stress explanation, we built the single-layer-based stress model in form of combined springs and concluded the involved formulas.
与传统设计相比，优化设计过程简单易行，设计结果理想，并且可使组合弹簧重量最小。
Compared with the traditional design the procedure of the optimum design is simple the result of the design is perfect and the weight of the composite spring is lightest.
与传统设计相比，优化设计过程简单易行，设计结果理想，并且可使组合弹簧重量最小。
Compared with the traditional design the procedure of the optimum design is simple the result of the design is perfect and the weight of the composite spring is lightest.
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