沥青路面使用性能的非等时距灰色预测模型

目前常依据灰色理论在检测数据缺乏的条件下建立沥青路面使用性能指标的预测模型,但传统的等时距灰色模型仅适用于等时间间隔且累加生成具有明显指数规律的原始动态序列,而非等时距灰色模型能减少原始数据在检测时间上的限制,可以系统地利用原始数据。对等时距灰色模型进行了改进,建立了非等时距灰色模型。工程实例计算表明,非等时距灰色模型在沥青路面性能指标的预测方面较传统的等时距灰色模型具有更高的精度,更能符合工程实际的需要。     

INDU网络的解析表达及其一致性计算

INDU网络在区间代数的基础上引入了时间区间的长度，细化了时间区间之间的定性关系，使得时间定性推理的精确性有所提高。本文给出了INDU网络的0维、1维及2维的共计25个解析公式，用解析的方法来刻画INDU网络，并用它来实现INDU网络全局解的一致性计算。     

不确定性时间知识推理和验证算法及列车群建模分析

时间知识的推理和验证技术对列车群行为建模分析具有重要意义,是其实施关键。本文在原来工作的基础上,引入模糊时间区间、扩展模糊时间Petri网(EFTPN)及可能性值运算等内容,提出了一种基于EFTPN的不确定性时间知识推理和验证算法。该算法效率高,占用空间少;不但能够进行不确定性时间信息的精确推理,而且适用面更广,可以较好解决复杂情况下的时间推理和验证问题。     

Research on the Influence of Small Distance Subway Tunnel Passing through Buildings at Short DistanceEI北大核心

Research purposes: At present, the urban subway is developing rapidly in our country, among which there are many problems. This paper takes a seven-story frame structure office building as research object. In view of the phenomenon that the dome subsidence and the land subsidence rate exceed the early warning in the field construction of the left line tunnel, combing theoretical analysis with the MIDAS-GTS numerical simulation, we took the "building-stratum-tunnel" as the research object, analyzed the influence of small distance tunnel construction process of mine method on the adjacent buildings, and analyzed the influence difference of the construction sequence of the left and right lines. Finally we put forward the relevant engineering technical measures. Research conclusions:(1) The tunnel construction makes the building in the tensile zone, and the structure is easy to be damaged. When the structure is far away from the influence of the excavation, the order of tunnel excavation is not significant. (2) When the surrounding rock is broken and close to the building, it is better to excavate the tunnel far away from the side of the building. At the same time, we should pay attention to taking the reinforcement measures near the side of the building and the intermediate rock column. (3) The research results can be applied to the field of shield construction in subway, and have a good guiding effect on the shield tunnel passing through buildings at close distance. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

沥青稳定碎石排水基层材料的疲劳特性分析

通过室内小梁疲劳试验，分析影响沥青稳定碎石排水基层材料疲劳特性的因素，为沥青稳定碎石排水基层的组成设计提供依据。同时，研究荷载间歇时间对沥青稳定碎石排水基层材料疲劳寿命的影响。     

地铁盾构区间下穿深埋污水管计算分析

地铁盾构区间在下穿深埋污水管线时,由于土层损失,会造成一定程度的管道下沉和变形,影响管道运行安全,进而影响地铁区间隧道的实施及运营安全。通过计算分析,量化盾构对管道的影响,从而确定地铁施工需要采取的控制指标及污水管道必需的迁改范围。对于大管径污水管道,在地铁前期设计时必须作为风险源进行严格计算和专项设计,以尽量减小地铁与污水管道间的相互影响。     

The inherent precision of regression estimated route probabilities

From basic assumptions about independent and consistent driver behaviour, and with data from traffic counts, we derive statistical properties of regression or correlation estimates of route selection probabilities, turning probabilities and travelling times. Our modelling is conditional in a way that avoids most traffic generation problems and permits an asymptotic analysis of the precision under mild assumptions allowing non-stationarity. This allows us to put together non-stationary data from the corresponding time intervals during several days when we aim at high precision estimates.     

移频键控信号测量系统误差分析与补偿

为了提高轨道电路移频键控信号(FSK)的测量精度,给出了一种基于FPGA+ARM处理器的移频键控信号测量与误差补偿方法.该方法在FPGA中利用量化时钟实时测量载波信号的周期,并将测量数据经过缓存后传输给ARM处理器.ARM处理器对测量的载波信号周期数据及产生测量误差的主要原因进行分析,并对载频信号上、下边频切换时产生的...     

武汉地铁盾构施工地表沉降的非等间隔模型分析

研究目的:地铁盾构施工监测数据(特别在盾构始发段)具有数据量小,监测间隔不相等的特点,一般数据拟合与预测方法的应用受到诸多约束。研究结论:本文提出了通过预设阈值的改进非等间隔模型,并基于武汉地铁盾构二号线的积玉桥始发段的监测数据进行了拟合与预测分析。结果表明,本文方法能在数据量小,非等间隔监测数据的前提下,对地表沉降进行较好的拟合与预测,并与传统非等间隔模型的结果进行了比较。     

基于不等时距离散灰色预测模型的软土地基沉降分析

分别采用线性插值、三次样条插值两种方法,用MATLAB语言编制程序将不等时距序列转化为等时距序列,采用离散灰色预测模型来进行沉降预测.