Applying a semantic information Petri Net modeling method to AUV systems design

This paper informally introduces colored object-oriented Petri Nets(COOPN) with the application of the AUV system. According to the characteristic of the AUV system's running environment,the object-oriented method is used in this paper not only to dispart system modules but also construct the refined running model of AUV system,then the colored Petri Net method is used to establish hierarchically detailed model in order to get the performance analyzing information of the system. After analyzing the model implementation,the errors of architecture designing and function realization can be found. If the errors can be modified on time,the experiment time in the pool can be reduced and the cost can be saved.     

一种"半桥型"可逆直流PWM调速电路

分析由两个IGBT开关元件与直流电机组成的半桥型主电路的特点和工作原理,介绍了实验调试并讨论了双闭环的实现,最后给出了电路结构总图.     

高速铁路砂质板岩粗粒土填料蠕变特性试验研究

通过利用大型单轴固结仪对砂质板岩粗粒土填料进行低应力状态(σ=50,100,200,400和800 kPa)的单轴压缩蠕变试验,研究砂质板岩粗粒土路堤填料的蠕变性质。基于粗粒土蠕变理论,分析填料的蠕变曲线特征,确定蠕变的初始计算时间,选取常见的蠕变本构模型,利用改进的高斯-牛顿法确定压实度为95%的砂质板岩粗粒土的蠕变模型参数。研究结果表明:砂质板岩粗粒土在低应力状态下表现出具有弹性变形、稳定蠕变和无黏性流动的衰减蠕变特性;H-K-K模型更准确地反映砂质板岩粗粒土填料的蠕变特性。     

高速公路填石路基施工技术应用

时代的发展,让我们认识到填石路基对于高速公路施工的重要性。所以,在分析填石路基施工技术现状和特点的基础上,对于高速公路填石路基施工技术的具体应用进行探讨,希望可以满足高速公路施工的要求。