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在能源及化工系统仿真的计算中,普遍地遇到流动问题的仿真计算,其精确计算需同时考虑多种平衡条件,故一般来说是一个高度非线性的问题,而在仿真中,所关心的是系统的宏观特征。工程中的许多流动系统具有类似于电网络的特性,这时可用网络法分析其宏观特征。人们提出了用实验和理论分析方法得到网络各支路的阻力特性曲线的基本型式,但在有关待定阻力参数的确定方面,研究尚不够充分。为此,提出根据测试样本构造以待定阻力参数为自变量的误差函数,以它为优化目标函数,进而使用一种基于最陡下降法的快速变步长迭代算法来求其最小值点。这样,为上述流动问题提供了一种有效模拟系统机理的快速计算方法,被用于锅炉水系统的仿真,取得了满意的结果。
In the calculation of energy and chemical system simulation, generally encountered in the simulation of flow problems, the precise calculation of the need to consider a variety of equilibrium conditions, it is generally a highly nonlinear problem, and in the simulation, the concern The system’s macro features. Many of the mobile systems in the project have characteristics similar to electrical networks, and the macroscopic characteristics of networks can be analyzed. People have proposed the experimental and theoretical analysis of the network to get the basic characteristics of the resistance curve of each branch, but in determining the parameters to be determined, the research is not sufficient. Therefore, an error function is proposed based on the test sample to construct the resistance parameter to be determined as an independent variable, which is used as an optimization objective function, and then a fast variable step size iterative algorithm based on the steepest descent method is used to find the minimum point. In this way, a fast calculation method for effectively simulating the system mechanism is provided for the above flow problem, which is used to simulate the boiler water system with satisfactory results.