多变指数 meaning in Chinese

polytropic exponent
polytropic index

The paper described the building process of model that can identify the shock - absorber parameter of landing gear and at the same times optimize performance of system . in this paper , there are also some debate , it include identifying parameter which can not be measured , such as the air polytropic exponent and the orifice discharge coefficient of shock - absorber
本文利用复合形优化算法建立了起落架缓冲系统参数识别与系统优化模型，对缓冲器空气压缩多变指数和油孔流量系数等不可测参数的识别和着陆、滑跑载荷多目标优化问题进行了讨论。