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子午线轮胎的平衡轮廓与模型轮廓是不同的，平衡轮廓设计的成功依赖于模型设计，而模型设计应开始于受约束充气平衡轮廓设计计算完成之后。模型轮廓与平衡轮廓有关的几个量是：模型外直径Ｄｍ、模型胎体帘线长度Ｌｍ和模型断面宽Ｂｍ。模型胎体帘布轮廓形状设计遵循的基本原则为：①向平衡轮廓靠拢；②大变形集中于胎侧；③模拟负荷下形状。
The balance profile of a radial tire is different from the model profile. The success of a balanced profile design depends on the model design, and the model design should begin after the design of the constrained inflation balance profile has been completed. The number of model profiles related to the balance profile are the model outer diameter Dm, the model carcass cord length Lm and the model section width Bm. The basic principles of model carcass ply contour shape design follow: ① close to the balance of the contour; ② large deformation concentrated in the sidewall; ③ under the load shape.