城市地下潜在的孔洞对城市建筑的安全性构成威胁,微重力测量通过观测目标区域内重力场的微小变化来反演地下物质的分布情况,进而达到探测地下孔洞的目的.本文采用CG-5高精度相对重力仪对同济大学校园内防空洞地表区域进行了微重力测量实验,正确发现了地下防空洞的位置.

为了使大型起重船舶锚泊系统在浅海作业时可靠、高效、高质量地运行,对锚泊控制系统的设计研究就变得非常重要。本文分析了大型船舶锚泊控制系统的功能需求,比较了锚绞车系统的液压驱动和电力驱动方式,设计了控制系统的基本组成,采用先进的变频调速控制技术,构建了基于Profibus-DP现场总线的冗余双光纤环网,并将其应用于施工实践。结果表明该系统运行稳定可靠,自动化程度高,实时性好,控制效果理想,使用方便。

In this study,the hydraulic system for tamping trucks is investigated in terms of automatic lifting,lining and leveling.Accordingly,the causes and solutions for extra-high hydraulic oil temperature are speculated.Through comparison and selection of temperature-rise reduction measurements and hydraulic temperature reduction-radiation systems,the automatic radiation system is feasibly implemented based on automatic hydraulic oil temperature control.

By applying modern computer and network technologies for large-scale construction-line maintenance machinery,the constructional management system is imperative to improve managerial level and efficiency of construction and maintenance.According to the processes and characteristics of mechanized maintenance management,the DFD method is first utilized for management information system analysis on large-scale railway maintenance machinery.Afterwards,a hierarchically-functional model is established to configure system software infrastructure using.NETTM technology.Finally,the distributed network structure and operational platform are illustrated.