大碎石沥青混合料骨架密实型级配设计理论与方法研究

利用石石接触度概念,评价大碎石沥青混合料粗集料是否形成紧密骨架或松排骨架,提出了适合我国国情的大碎石沥青混合料骨架密实型设计法.     

共轨式电控柴油喷射系统原理、结构及故障自诊断

随着交通运输车辆、船舶的急剧增加,柴油机排放的尾气已经成为对地球环境的主要污染源.世界各国业已开始寻找和采取有效的技术措施主动地减少和控制污染物的排放.柴油机共轨式电控燃油喷射技术是一项较为成功的控制排放污染的新技术,现以Bosch公司共轨式电控柴油喷射系统为例进行分析介绍.     

FAULT IDENTIFICATION IN HETEROGENEOUS NETWORKS USING TIME SERIES ANALYSIS

Fault management is crucial to provide quality of service grantees for the future networks, and fault identification is an essential part of it. A novel fault identification algorithm is proposed in this paper, which focuses on the anomaly detection of network traffic. Since the fault identification has been achieved using statistical information in management information base, the algorithm is compatible with the existing simple network management protocol framework. The network traffic time series is verified to be non-stationary. By fitting the adaptive autoregressive model, the series is transformed into a multidimensional vector. The training samples and identifiers are acquired from the network simulation. A k-nearest neighbor classifier identifies the system faults after being trained. The experiment results are consistent with the given fault scenarios, Which prove the accuracy of the algorithm. The identification errors are discussed to illustrate that the novel fault identification algorithm is adaptive in the fault scenarios with network traffic change.     

c,φ相关性对边坡整体稳定性的影响

在边坡的Bishop条分法的基础上，令安全系数F=1，得到相应的极限状态方程。然后根据结构可靠度原理的JC法，将土的抗剪强度指标看作随机变量，推导出Bishop条分法的可靠度指标的计算公式。对土层剖面引入随机场模型，把土的抗剪强度指标c，φ的点变异性和空间变异性联系起来。各层c，φ均具有空间自相关性。对于互相关性，假定同一土层内c，φ有互相关性，土层与土层之间c，φ无互相关性的。结合一数值算例分析了c，φ的自相关性和互相关性对可靠度指标的影响。为了方便，只计算了按安全系数法搜索最危险滑动面上的可靠度指标?数值结果表明：c，φ的自相关性与互相关性对边坡整体稳定可靠度指标的影响是显著的；应用JC法研究Bishop条分边坡的整体稳定时，可靠度指标有时也会不收敛。     

调压开关卡位自复电路

提出在机车TK控制电路中增加零卡位自处长电路，彻底消除因TK过零卡位故障而造成的不良后果。