既有桥梁拓宽上部结构接缝处理方法分析研究

该文对既有桥梁拓宽新旧桥接缝各种处理方法的优缺点进行了论述。根据桥梁拓宽实例,得出了桥梁拓宽前新旧桥的总体处理原则、拼接时机的选择等结论。同时,提出了桥梁拓宽上部结构处理需要考虑的几个问题,对既有桥梁的拓宽改造具有一定的参考价值。     

基于物联网的地质灾害群测群防专业化远程监测系统开发

我国在地质灾害监测方面主要有群测群防和专业监测2种手段,但其在实际应用中均存在诸多弊端。针对这一问题,以经济、自动、有效为原则,结合2种监测手段的优势,研究专业指导下的群测群防监测系统方案,开发出一套以变形数据为主要监测对象的地质灾害群测群防专业化远程监测系统(GTMS)。该系统利用监测设备可实现灾害点变形数据的实时监测与智能报警,利用网络数据管理发布平台可实现数据的有效管理与智能分析预警,可以为管理部门提供第一手监测数据,并为灾害来临前的及时预警、有效避险提供宝贵的时间。     

地下停车场交通工程设施设计研究

针对现有规范对地下停车场交通工程设施设计规定不尽详细的问题,在国内设计现状调查的基础上,总结现有工程取得的经验教训,从功能需求角度出发,提出了地下停车场交通工程设施的设计原则,并对其设计内容包括车辆引导设施和行人设施进行了详细论述,可为停车场工程设计提供参考。     

PID plus fuzzy logic method for torque control in traction control system

A Traction Control System (TCS) is used to control the driving force of an engine to prevent excessive slip when a vehicle starts suddenly or accelerates. The torque control strategy determines the driving performance of the vehicle under various drive-slip conditions. This paper presents a new torque control method for various drive-slip conditions involving abrupt changes in the road friction. This method is based on a PID plus fuzzy logic controller for driving torque regulation, which consists of a PID controller and a fuzzy logic controller. The PID controller is the fundamental component that calculates the elementary torque for traction control. In addition, the fuzzy logic controller is the compensating component that compensates for the abrupt change in the road friction. The simulation results and the experimental vehicle tests have validated that the proposed controller is effective and robust. Compared with conventional PID controllers, the driving performance under the proposed controller is greatly improved.     

城市轨道交通车站分向客流预测方法研究

城市轨道交通车站分向客流预测数据是各出入口通道设计的重要依据,目前适合我国城市轨道交通车站分向客流预测研究工作开展并不多.文中以车站所属的线路客流预测数据为基础,根据车站周边土地利用现状及规划情况,采用“逐层分解”法预测各个出入口通过客流量,并研究了全日小时及高峰小时内部的波动系数,通过广州市轨道交通13号线鱼珠站分向客流预测研究证明,预测方法是合理且可行的.     

扶壁式闸室肋板内土压力变化规律研究

结合邵伯三线船闸工程,分析了应用ABAQUS软件进行墙土接触问题建模的技术。采用回填土自重应力的预先平衡技术,避免了填土沉降对接触分析精度的影响。通过扶壁式闸墙静止土压力模拟,验证了计算模型的合理性。研究了墙后土压力分布规律,分析了肋板之间土拱效应形成的机理。结果表明,墙体侧向位移时,土拱效应更加明显。最后,提出了土压力的简化计算建议。     

邵伯三线船闸闸室墙变形监测方法研究

以邵伯三线船闸为工程背景,建立了扶壁式闸室墙变形监测系统,通过在扶壁式闸室墙前趾、后趾、顶端以及内部安装一系列测量装置,可系统地监测闸室墙在施工期、运营期变形规律,克服传统的施工和运营期监测相互分离的弊端,对闸室墙能进行长期、系统、精确地监测,在实际运用中取得了良好的效果。     

新型轻卡变速器壳体动静态性能分析

在研究变速器壳体动静态性能分析的基础上,以某新型轻卡变速器壳体为研究对象,阐述壳体的受力情况和边界约束,并对壳体结构进行了刚度、强度性能分析.此外,通过计算各档位齿轮在1 800 r/min下的齿轮啮合频率,结合变速器总成噪声实验数据,以及壳体在有约束情况下的固有频率和振型,研究变速器噪声与壳体固有频率之间的关系.     

基于丰田凌志1UZ-FE电控发动机故障模拟系统设计

为提高发动机电控技术理论与维修技术的教学效果,本文选用具有代表意义的丰田凌志1UZ-FE电控发动机进行实训系统设计,结合发动机控制电路常见故障的诊断和检测思路,完成了对系统硬件和软件的设计,并通过单片机模拟仿真软件Proteus进行了单片机和电路系统的仿真。仿真结果表明,通过硬件与软件匹配,可有效设置实际故障,并且实训系统工作稳定,可为汽车维修人员和高职学生提供良好的故障检测与诊断学习平台。     

Sanders中长圆柱壳理论及其在海洋工程中的应用(英文)

The cylindrical shell is one of the main structural parts in ocean engineering structures.These cylinders are mostly of medium length,which means that the radius of the cross section is significantly smaller than the length of the cylindrical shell.From the viewpoint of the shell theory,they belong to the mid-long cylindrical shell category.To solve mechanical problems on this kind of structure,especially a cracked cylindrical shell,analysis based on shell theory is necessary.At present the generally used solving system for the mid-long cylindrical shell is too complicated,difficult to solve,and inapplicable to engineering.This paper introduced the Sanders’ mid-long cylindrical shell theory which reduces the difficulty of the solution process,and will be suitable for solving problems with complicated boundary conditions.On this basis,the engineering applications of this theory were discussed in conjunction with the problem of a mid-long cylindrical shell having a circumferential crack.The solution process is simple,and the closed form solution can usually be found.In practical engineering applications,it gives satisfactory precision.