基于UG二次开发的DTS名义值测量

文章主要介绍基于UG二次开发的DTS名义值测量,本系统基于西门子的先进CAD设计平台NX之上开发的系统。以NX11和Visual Studio 2010作为运行和开发平台的,C、C++为开发语言,使用Block UI Styler为界面设计工具,NXOpen则提供了开发所需的应用程序包(API)。系统可以通过获取整车FVML(Finish Vehicle Measurement Location)文件包含的信息,通过用户选择文档中对应的零件特征,实现自动测量数模名义值及对应截面,并与FVML定义的数值进行对比。     

桥墩防撞装置碰撞动力学分析

运用非线性有限元基本理论，采用国际上广泛使用的大型结构分析程序LS-DYNA，建立了船舶和桥墩防护装置的三维有限元计算模型，分析了防护装置碰撞特点、船首及构件的损伤和吸能特性，得出了主要吸能结构吸能比例，碰撞力曲线的非线性特点，船体和防撞装置外板是主要的吸能结构等结论．     

悬浮式深弹反鱼雷系统作战效能分析

基于悬浮式深弹反鱼雷系统的组成和工作原理,提出了悬浮式深弹反鱼雷系统的作战效能评估方法。根据美国工业界武器系统效能咨询委员会（WSEIAC）提出的效能模型,对悬浮式深弹反鱼雷系统作战效能的可用度向量A、可信度矩阵D和固有能力矩阵C进行了分析,重点对固有能力矩阵中反鱼雷概率这一指标进行了研究。按照悬浮式深弹反鱼雷作战物理过程,将反鱼雷概率分解为鱼雷经过悬浮式深弹阵的概率、悬浮式深弹阵探测鱼雷概率和毁伤鱼雷概率,从而建立了悬浮式深弹反鱼雷系统的作战效能模型。     

舰舰导弹对敌水面舰艇突防能力评估模型初探

舰舰导弹是对水面舰艇攻击的主要武器之一,导弹突防能力是评价导弹性能的重要指标.根据反导武器系统的特点,建立了单发和多发导弹对敌舰攻击的突防能力模型.     

利用PLC对定位车进行运动控制

黄骅港的翻车机系统分为翻车机、定位车、推车机三大运动机构。它们之间紧密配合,协调动作,共同完成火车的翻卸工作。由于现场实际的需要,对其运动的速度、加速度和定位精度的要求非常高。图1是定位车的运动控制的方框图。     

基床式基础防波堤的动力软化判别标准的研究

以长江口深水航道治理二期工程为依托,进行基床基础防波堤的动力软化判别标准的研究,分析在波浪作用下3个不同沉降量的典型断面下卧地基土的自重应力、附加静应力、波浪作用的附加动应力分布间的关系,初步得出该地区软粘土可能出现动力软化现象的判别标准。     

Analysis on the Characteristics and Development Trends of the Support Technology of High Ground Stress Tunnels in China北大核心CSCD

Combining the present situation and development trend of different tunnel support technologies at home and abroad, this paper analyzes the problems of rockburst in hard rock tunnels and large deformation in soft rock tunnels caused by high ground stress. It is concluded that: 1) regarding the rockburst problem, the current support technology is mainly influenced by the rock burst mechanism which is dominated by static factors, and so the used support components are generally of smaller deformation performance and "passive support" properties; 2) as the rockburst is the result of dynamic-static stress coupling, and only the anchor bolt has the "active support" attribute in the current "shotcrete+anchor bolt+wire net" support system, so the best support system should have the two functions of active support and energy release in terms of the rockburst problem, and the key focus of the research and development is anchorage members; 3) there are three main support types for large deformation in soft rock tunnels, e.g. the heavy support, layered support and yielding support. Among them, the heavy support system in underground cavern with large deformation is easy to induce excessive surrounding rock pressure, and so the applicable conditions are limited. The layered support system is still not the best choice due to its immature theoretical study, difficult determination of the thickness value and the installation time of each support layer and the interference to construction progress. With the characteristics of timely support and yielding while supporting, the yielding support system can give full play to the performance values of surrounding rocks and supporting materials, and make both of them reach the optimal state, so it is the best choice for supporting the soft rock tunnels with large deformations. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

Numerical Simulation of Advanced Geological Forecasting Based on Multi- Source Seismic Interferometry北大核心CSCD

For existing advanced geological forecasting, the forecast distance is short and the test frequency is high, increasing test and construction risks. Since various methods have different requirements for the test environ-ment, preparation work can be tedious and result in a long construction time thereby affecting normal construction.A new advanced geological forecast technique based on multi-source seismic interferometry for tunnels is proposed.This technique uses the blast at one end of tunnel as a centrum and receives the signal at the other end of the tun-nel, therefore allowing advanced geological forecasting of the unexcavated tunnel part by relative processing and im-aging. A numerical simulation of this kind of geological forecasting using the finite difference method to simulate two kinds of unfavorable geological bodies (karst and a fault) predicted them accurately and verified the effective-ness and accuracy of this geological forecasting method. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

Experimental Study on Mechanical Behaviors of Prefabricated Column-Base Joint with Grouted Sleeves Connecting Longitudinal Reinforcements in Tunnels北大核心CSCD

In recent years, large shield tunnels with internal double-decked lanes have been developing rapidly in the field of highway tunnels, and prefabricated elements are increasingly adopted in internal structure. Based on the columns-base joint in Zhuguanglu tunnel, which is under construction, 2 full-scale specimens are designed for the quasi-static test, one specimen is connected with grout sleeve splicing and the other is cast in place. The test results show that: the bearing capacity of specimen with grout sleeve splicing is equal to that of cast-in-situ specimen, but its ductility and energy dissipation capacity are worse than that of the cast-in-situ specimen. And for the specimen with grout sleeve splicing, there exists crack concentration on the area above the sleeve. The crack width is too larger in this area. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

绿色汽车维修企业评价指标体系研究

为了推动汽车维修企业的绿色、低碳、可持续发展,本文根据汽车维修企业的特点,从绿色设备配置、污染控制、资源节约与循环利用、质量控制和绿色管理5个方面,共选取24个评价指标,构建绿色汽车维修企业的评价指标体系。评价指标中既包含定量指标又包含定性指标,且各指标数据获取方法简单、可操作性强,便于指标量化。研究成果可以作为绿色汽车维修企业的考核标准。