作　　者： ; ; ;

机构地区： 华南理工大学轻工与食品学院制浆造纸工程国家重点实验室

出　　处： 《造纸科学与技术》 2009年第6期20-23,共4页

摘　　要： 为提高IAPWS-IF97(2007.8修订版)的计算速度和精度,用面向对象的方法实现了水和水蒸汽热力性质的软件并用代码优化的方法对其计算模型进行了优化。优化的关键方法是用合并已知量、代数变换、删除公共子表达式、代码外提、强度削弱对其1、2、3区的基本方程、导出方程和反推方程进行优化。关键在于用强度削弱的方法对它们的幂运算进行优化。给出了优化规则和相应的优化算法。优化后,运算次数平均减少2.42倍,计算速度平均提高5.63倍。通过在造纸工业中的应用,表明优化后的程序具有计算速度更快、精度更高和提高了边界一致性的优点。 To improve the computing speed and accuracy of the latest IAPWS - IF97 （2007.8 Revision）, by object-oriented method, its corresponding software is implemented and its computing models are optimized by code optimization method. The key methods of optimizing the computing models of IAPWS - IF97 are to merge constant values, refine algebra equations, delete common sub expressions, extract constant code out of cycle and weaken operation intensity. We need only use these methods to optimize the implementation of the basic equations, derivative equations and backward equations for regions 1, 2, 3. The most important optimization key method is using weakened operation intensity for their power operations. The optimization rules and its corresponding optimization algorithms are given. After optimization, the results show that the operation count is more than 2.42 times decrease than before optimization on average, and the computing speed is more than 5.63 times faster than before optimization on average. The results of application in paper industry indicate that the advantages are faster computing time, more accuracy and better consistency of the boundary.

关 键 词： 代码优化 强度削弱 代数变换 造纸工业

领　　域： [动力工程及工程热物理]