描述车削颤振过程的数学模型

本文从车削的特点出发。根据颤振理论,分析了三维动态车削中影响颤振的主要因素,提出了描述车削颤振的适应性建模方向并建立了动态车削过程的非线性数学模型。本文所建模型反映出的有关车削颇振的规律性与车削颤振实验结果取得了良好的一致性,为阐明车削颤振机理及其在线监控提供了理论依据。     

Simulation of Grain Drying in Natural Convection Dryer

All the works so far on simulation of grain drying by natural convection of air presents conflicting reslts on the drying time forecast. In this work the models of Hukill, Thompson and Michigan are tested in same type of dryer. Appropriate equations are developed to correct the drying time, starting form the models of Thompson and Hukill. The solution of the equations of michigan model is developed on fintie difference and similarly and some speical technuques are utilized on the Thompson model. 53 test results are utilzed here to validate the simulation model of drying.