基于Vega的鱼雷弹道视景仿真软件设计

视景仿真是进行鱼雷弹道可视化研究的重要内容。文章首先介绍了鱼雷弹道视景仿真软件的功能和框架结构及工作流程,同时分析了鱼雷弹道和运动学模型,然后由Creator建立了鱼雷和水下环境的3D模型,最后重点研究了在VC＋＋开发环境下如何结合Vega进行鱼雷弹道视景仿真软件的实现。     

船舶电力推进交流与直流系统对比研究

对交流与直流船舶综合电力推进系统的设计进行了对比分析,将船舶电力推进系统的设计分为系统设计和关键设备选型设计两部分进行了研究。在系统设计方面,主要对比了交流与直流系统的短路电流、选择性保护、谐波抑制的异同。在关键设备选型设计方面,对ABB、SIMENSE和EMS三个技术方案对直流母排故障的保护方面进行了分析。随后对直流船舶电力推进系统的优势与不足进行了分析,最后对船舶电力推进交流与直流系统对比进行了总结。     

新建隧道下穿既有公路隧道施工技术

成渝客运专线新中梁山隧道下穿既有高速公路隧道,隧道拱顶距公路隧道最小净距为7.0m,施工采用大管棚注浆技术,对交叉影响段进行控制爆破,控制振速小于2 cm/s,并对既有高速公路隧道监控量测措施进行分析,既可以起到加固围岩的目的,保证新建隧道的安全,又能使既有公路隧道正常运营.     

直流牵引网短路电流的计算

轨道交通直流牵引网短路电流的计算可为变电所设备的选择、继电保护设计、牵引变电所运行方式的确定等提供重要依据.给出了短路电流计算的数学模型,并利用可视化语言CVI完成了短路电流仿真计算;分析了整流机组外特性线性化对短路电流计算的影响.整流机组的外特性呈非线性特性,采用分段线性化的处理方法能够满足实际工程设计对计算精度的要求.     

地铁盾构管片制作的质量控制

为适应城市地铁的迅速发展、盾构法施工技术被广泛应用,使衬砌管片的应用数量越来越多,指出管片制作质量必须以满足产品的使用功能为基础、以保证其特殊性能为原则。通过对各种材料进行优选、试验．充分考虑各种影响混凝土的不利因素并加以控制。以提高管片用混凝土性能及管片的制作质量。     

Analysis of damping performance of isolated rubber floating slabEI北大核心

Research purposes: The basic component of the track structure with isolated rubber floating slab is the concrete slab track born by the elastic element. The research was done on the mechanical properties of the floating slab, the analysis was made for the natural frequencies, mechanical response under dynamic load and damping performance, and the discussion was made on the reasonable thickness of the ballastless track to provide the reference to the track design. Research conclusions: The research results show that the natural frequency of the track system decreases with the increase of the thickness of the ballastless track, and the rate of change decreases with increase of the track thickness. The acceleration insertion loss of the track basis increases with the increase of the thickness of the ballastless track, and the rate of change decreases with increase of the track thickness. When the thickness of the ballastless track reaches at 0.4 m, the corresponding dynamic performance, the damping performance effect and the concrete amount of track bed are rather economical. From the present theoretical analysis and online testing, it can be seen the damping performance effect of the isolated rubber floating slab system is obvious, and its construction and maintenance programs are systematic.     

某豪华游轮在波浪中的耐波性能预报

The seakeeping performance of a luxury cruise ship was evaluated during the concept design phase. By comparing numerical predictions based on 3-D linear potential flow theory in the frequency domain with the results of model tests, it was shown that the 3-D method predicted the seakeeping performance of the luxury cruise ship well. Based on the model, the seakeeping features of the luxury cruise ship were analyzed, and then the influence was seen of changes to the primary design parameters (center of gravity, inertial radius, etc.). Based on the results, suggestions were proposed to improve the choice of parameters for luxury cruise ships during the concept design phase. They should improve seakeeping performance.     

基于云模型-AHP的战场电磁频谱保障能力评估

分析战场电磁频谱保障能力的构成体系,云理论是一种用于处理不确定性和含糊性知识的数学工具,可实现概念与数据之间的相互转换。因此运用云理论和AHP建立数学评估模型,并举例对战场电磁频谱保障能力进行有效的评估,得出相应的结论。     

岸桥大车液压系统的防风改造

当大车液压系统故障时,现场手动强制作业,存在严重安全隐患。分析了对大车液压系统工况及问题,找出故障原因,并提出合理的解决方案,提高岸桥的安全性和可靠性。     

岸桥小车拖链系统故障分析及改造方案

目前DICT码头正在使用的8台65t-65m岸桥为双箱梁结构,小车的运行方式为钢丝绳牵引式,前后托架通过张紧和循环钢丝绳连接于小车上,且与小车的速度比保证为1：2。小车电缆采用带式电缆输送系统,其一端固定在小车上,