活塞热冲击集总参数模型的随机温度分析  

Stochastic Analysis of Temperature for Thermal Shock on Piston with Lumped Parameter Model

作　　者：王玉芝[1] 胡亚才[1] 洪荣华[1] 俞自涛[1] 沈季胜[1] 

机构地区：[1]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《内燃机学报》2003年第1期81-85,共5页Transactions of Csice

基　　金：国家自然科学基金资助项目(59876034)。

摘　　要：将随机过程理论与热传导理论相结合,分析了内燃机随机热冲击的随机成分对活塞温度场的影响,建立了与热冲击试验台加热环境相适应的矩形热冲击模型和集总参数导热模型,求得了相应的解析解,并利用迭代法求得其随机解及其均值、均方值和方差。在试验台上的活塞温度场测试结果表明随机热激励模型可以更精确地模拟活塞的受热响应。集总参数模型给出了活塞随机温度随时间变化的基本规律,为定性分析活塞温度场随机变化规律提供了依据。In this paper, the stochastic process theory is combined with the thermal transfer theory, and the influence of the random thermal shock impacted on piston in gas engine has been analyzed, the lumped parameter system rectangle thermal shock model are established. Analytical solution, random solution, mean, mean square value and variance have been gotten by using the iterative method. After the results have been compared with test result in the experiment, it is confirmed that random thermal inspiration impacted on piston can simulate the heat response of piston accurately. The basic rule that random temperature changes along with time are given by the lumped parameter system, then the qualitative analysis tool is provided in order to analyze the random variety rule of piston conveniently.

关 键 词：活塞 热冲击 集总参数模型 随机温度 内燃机 矩形热冲击 随机解 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程]