Based on reliability theory, a basic maths model of calculating the reliability of drainage pipe line is recommended for factual need of drainage pipe line design.
根据排水管网设计的实际需要，以可靠性分析理论为依据，提出可以用于排水管网可靠性计算的基础数学模型。
The water hammer in a pressure pipe in prototype can be in terms of theory simulated in a model, based on the gravity similarity and elastic material similarity.
理论上讲，按重力相似准则设计模型，并保证模型材料与原型材料的弹性相似，即能在模型上模拟原型的水击现象。
Then combined pipe-line theory, the accumulator's integrated mathematical model with incurvate and strange diameter series connection pipeline is built.
然后结合管道理论研究得出了带有弯曲管路、异径串联连接管路的蓄能器数学模型。
Based upon the elasticity theory, a mechanical model for the casing pipe was built and the relationship between residual stress and compression strength was developed by FEM.
运用弹性力学理论，建立石油套管的力学模型，通过有限元计算，得到残余应力与石油套管抗压溃强度之间的关系。
The paper also establishes mathematical model for the operating condition of the pipe network of heating with reference to relevant theorems and laws of fluid network and network graph theory.
利用流体网络及网络图论的有关定理定律，建立供热管网水力工况的数学模型。
The paper also establishes mathematical model for the operating condition of the pipe network of heating with reference to relevant theorems and laws of fluid network and network graph theory.
利用流体网络及网络图论的有关定理定律，建立供热管网水力工况的数学模型。
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