The mathematical methods that applied to uncertainty analysis of environment model were summarized, with analysis of the application area, merits and demerits.
总结用于环境模型不确定性分析的各种数学方法，并分析其应用范围和优缺点。
The mathematical model for aircraft engine, heat exchanger, duct, venturi, valve and other components in aircraft environment control system (AECS) is described in this paper.
介绍了飞机环境控制系统中发动机引气、热交换器、管道、文氏管以及阀门等部件的数学模型。
After analysis of the environment of CNC machining in enterprise, the mathematical model of CNC machining movement is established.
通过对企业CNC加工环境的分析，建立了CNC机床切削加工运动的数学模型。
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