永磁逆变系统并联技术的实现

介绍了永磁逆变系统并联技术的实现方案、工作状态和主要控制部分的设计。     

A two-dimensional tire model on uneven roads for vehicle dynamic simulation1

This study proposes a comprehensive analytical tire model for handling and ride comfort in low frequency ranges. A contact algorithm that is developed in this study provides a two-dimensional contact pressure distribution on even and uneven road surfaces with reasonable computational cost. Shear stresses and strains during cornering and braking are estimated by direct measurement of tread deformations. The model is validated against experimental force and moment data for general handling simulations. Cleat tests are also conducted and validated under different forward velocity and vertical load conditions for a tire vibration study.     

CO2 emissions: Are land-use changes enough for California to reduce VMT? Specification of a two-part model with instrumental variables

With vehicle miles of travel increasing at a faster pace than population, one strategy being actively pursued by both state and local governments is compact development. California recently passed legislation that aggressively promotes sustainability by endorsing and rewarding compact development. Likewise, the California Air Resources Board has set a statewide reduction target of 5MMT of greenhouse gas reductions from land use, based largely on achieving compact development patterns. In this paper, we use a multivariate two-part model with instrumental variables, which corrects for residential location self-selection bias. We use a much larger and more geographically representative travel survey on household travel patterns and socio-economic characteristics than represented in previous California studies; this allows us to robustly consider other influences on travel. Our results indicate that, all else equal, a 10% in residential density would reduce VMT by 1.9%. This elasticity is larger than the reported in previous econometric studies for the US, and specifically for California. However, as we show, the magnitude of this impact is still low considering reasonable ranges for policies aimed to increase residential density.     

基于最小割集的数值仿真在FMS可靠性研究中的应用

介绍了基于最小割集的仿真方法的原理及其具体实现过程,并分析了它在柔性制造系统FMS (FlexibleMachingSystem)可靠性研究中的应用,最后用一个FMS的实例来验证该方法的正确性。     

面向舰船应用的光纤陀螺工程化关键技术

光纤陀螺在国内已经进入高速发展时期,其面向舰船的应用也越来越受人瞩目.在高精度光纤陀螺工程化过程中,目前若干关键性技术仍未获得突破.本文介绍了光纤陀螺的基本原理,着重对干涉式光纤陀螺的结构和工作原理进行了说明;介绍了光纤陀螺国内外最新发展水平,以及在舰船上的应用情况;对高精度光纤陀螺工程化过程中所遇到的2项关键技术,即光纤陀螺长期温度稳定性技术和抗振技术进行了分析,并结合多年的实验经验,提出了具有实际参考意义的解决途径和措施.     

弧形体挠性接管力学模型及平衡性研究

提出了新型弧形挠性接管结构模型,建立了弧形挠性接管数学模型,对其进行了内压作用下的应力分析;对弧形挠性接管平衡性进行了深入研究,推导出管体骨架缠绕的平衡角公式,并对平衡角公式的正确性进行了验证.     

土工织物在长江界牌航道整治工程中的应用

通过长江界牌航道整治工程实例介绍土工织物在航道整治工程中的应用情况。     

用地性质与线路区位对社区公交的影响研究

社区公交的开通可有效缓解乘客出行的"最后一公里"问题,合理的站点布局可提高社区公交的客流量、促进公共交通发展。基于交通实地调查、SP调查和RP调查,对郑州市社区公交现状进行分析,分别对出行者的性别、年龄、家庭人口数、月收入、职业、出行目的进行特征分析。考虑用地性质和线路的区位影响,分别对社区公交的客流量和乘坐社区公交前使用的交通方式进行研究,分析其对社区公交的站点布设、两站点间的距离、发车间隔和发车频率等的影响,为社区公交的布设提供依据,增加社区公交的竞争力,更好地满足社区居民的出行需求。     

一种用于护岸的混凝土三维生态联锁块

在柔性生态护岸工程中,混凝土联锁块结构因其具有易预制、易施工、自限性好、亲水性强和具有景观效果等特点被逐步应用,目前主要将其作为二维铺面结构推广使用。为了进一步发挥其消能抗冲、嵌固抗滑、亲水护植和通用兼容等整体柔性护岸功能,提出一种三维生态联锁块的结构形式,对其作用机理和特点进行剖析。     

柔性混凝土(FCC)护岸港口工程应用数值模拟

由于港口护岸衬砌工作条件特殊性以及材料使用单一性,常常因外部荷载的作用导致其破坏。在新型材料研究基础上,结合柔性水泥混凝土(FCC)材料自身的优越的自适应性能以及护岸结构受力特点,将柔性水泥混凝土引入港口护岸工程中,提出一种新型的护岸衬砌结构。通过数值模拟应用实例,对比上面层FCC厚度一定、下面层普通混凝土(PCC)厚度变化时,上面层与下面层中心点处应力-应变变化趋势。结果表明:柔性水泥混凝土(FCC-PCC)符合衬砌护岸满足护岸堤防设计的要求,而且在外部荷载的作用下应力-应变变化均较小,是一种实用的护岸衬砌手段。