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目的 实现吸能盒的高碰撞吸能性和低成本化设计。方法 以传统的方形冲焊结构吸能盒为研究对象,将其优化为十字型冲焊和十字型内高压成形结构吸能盒,并利用成形数值仿真技术对十字型内高压成形吸能盒进行了成形性研究,还利用碰撞数值仿真技术对3种吸能盒结构进行了碰撞性能研究。结果 为提高碰撞吸能性,将传统方形冲焊结构吸能盒的4条主吸能常规传力路径,优化为十字型冲焊和十字型内高压成形结构吸能盒的12条主吸能传力路径,十字型内高压成形吸能盒同时能实现减重6.4%;利用成形数值仿真技术对十字型内高压成形吸能盒进行了成形性研究,结果显示十字型内高压成形吸能盒通过一模十二件生产,能具备优良的可制造性和经济性,相比方形冲焊吸能盒,十字型内高压成形吸能盒可实现降成本5.7%;利用碰撞数值仿真技术对3种吸能盒进行正面100%碰撞和正面40%偏置碰撞性能研究,相比方形冲焊吸能盒,结果显示十字型内高压成形吸能盒吸收能量分别增加12.8%和32.0%,碰撞力峰值分别降低8.4%和39.2%,比吸能分别增加20.5%和41.0%。结论 相比方形冲焊吸能盒,十字型内高压成形吸能盒可实现轻量化、低成本和高碰撞吸能性,同时还兼具优良的可制造性的特点。 相似文献
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出于使用功能的考虑,在多高层结构中多层楼板抽空后形成通高区.在通高区内,外筒框架柱无任何面外支撑,其面外失稳常常控制结构的设计.该文针对通高区多层群柱的基本组成单元--两层两跨的十字型刚架中轴压柱的面外稳定性能进行了研究,提出了其面外稳定性设计方法.首先,剖析了十字型刚架中轴压柱发生面外失稳的主要影响因素,并按照面外支... 相似文献
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基于双轴拉伸载荷下复合材料十字型试样的设计特点,对比分析了不同几何形状的十字型试样在不同厚度比和载荷比条件下中心测试区应力集中系数和承力系数的变化规律,并开展了不同载荷比的双轴拉伸实验进行验证。研究表明:十字型试样中心测试区系数与载荷大小无关,与试样几何形状、厚度比及载荷比有关;等宽加载臂宽度越小、厚度比越大,应力集中系数越小,载荷比不同,应力集中系数也不同;一般而言,中心测试区承力系数随厚度比增加而增大,x向承力系数βx随载荷比增加呈非线性增大,y向承力系数βy随载荷比增加呈线性减小;在双轴拉伸载荷条件下,形状D十字型试样在载荷比f=4/1时中心测试区y向应力分量为负值,表现为压应力状态。 相似文献
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为了提高电容检测传感器的检测精度,提出了一种十字型微谐振梁。将其简化为多场耦合振动模型,在考虑分子力与电场力的情况下建立动力学方程。求得其非线性振动固有频率及其变化规律,分析了不同参数对位移响应的影响。利用微加工技术制作十字型微谐振梁,采用静电激励—电容检测方法对其测试。创新性地将激振端与拾振端采用隔离带分开,使输出的电压信号不掺杂激励信号,结果更加真实准确。使用Owen交流电桥进行检测。结果表明:谐振梁尺寸较小时,分子力对谐振梁非线性振动影响较大。在忽略与考虑分子力时,相对误差分别为4.706%与1.971%,考虑分子力时理论值更加贴近于实测值。十字型微谐振梁的品质因数为105.8,较传统一字梁,检测信号更为明显。 相似文献
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目的 针对老旧小区停车难现状的调查和分析,运用服务设计思维与方法,探究老旧小区停车服务创新设计方案,并指导实践。方法 构建集成式服务设计模型,通过桌面研究和实地调研来确定老旧小区典型研究对象;根据服务蓝图分析主要利益相关者的用户行为及需求;利用KJ法深入分析停车服务问题,确定服务矛盾,并找出服务创新点;运用TRIZ的创新原理解决服务矛盾,寻找服务创新最优解,从而提升老旧小区停车服务的质量和体验。结果 针对具体案例输出相应设计,将解决停车规划的服务问题作为主要机会点进行服务创新,建立老旧小区智慧停车服务系统,提出云管理、云规划、云维护等系统功能来实现停车服务流程优化。结论 从系统视角优化老旧小区停车服务流程,为服务设计驱动的国内老旧小区停车服务创新提供实践方法和工具参考。 相似文献
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On the occasion of the Olympic sailing competitions in Kiel, the ZOB and the multi‐storey car park above it were built in 1972. The two‐storey multi‐storey car park, equipped for about 560 parking spaces, was originally connected to the railway station quay, the main railway station and the city centre by three pedestrian bridges. These bridges were demolished over the years. The new construction of the Atlantic Hotel in 2009 made it necessary to partially demolish the multi‐storey car park and the ZOB. At the same time, preparations began for the redesign of the remaining ZOB site. However, the original idea of renovating the building, which had been reduced in size by the construction of the new hotel, and additionally increasing it by two parking levels, was rejected. The poor structural condition and the planning of a new attractive bus station ultimately required demolition. In the new planning of the ZOB, two construction sites were defined. The design for the new multi‐storey car park on construction site 2 took into account the specifications for the number of storeys, the spacing areas, the maximum eaves height and the materials used in the neighbouring buildings as an independent building. The rounding of the facade at Stresemannplatz gives passers‐by coming from the west a clearer view of the harbour. The spindle, which is raised above the 6th floor, serves as a recognizable point visible from afar. 相似文献
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为提高停车场电子计时收费装置的检定效率和解决其在技术监督管理现状中存在的问题,提出运用现代云计算理念和大数据技术,建立以在线监测和校准系统为核心应用的停车场智能管理系统公共监管和服务云平台。在可行性研究的基础上,提出该系统的设计架构;在需求分析的基础上,提出智慧停车场客户端单元、在线检测单元、信息发布单元和行政管理单元等功能模块的概要设计方案;详细描述云平台的核心应用——在线计量检测的实现原理与过程。该系统用互联网技术来实现停车场计时收费系统的在线计量检定,经实践证明其改变传统停车场电子计时收费系统的计量检测模式,根据云端虚拟服务器的网络并发响应能力,检测效率理论上可以提高数千倍;实现停车信息、安全、检测和监督等综合服务集成到平台上,最大限度为管理部门和公众提供多个层面的信息服务。 相似文献
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白永生 《工程设计CAD及自动化》2014,(10):80-85
对车库电气设计中常见的停车场管理系统、车位引导系统、门禁系统进行介绍,侧重施工图设计的方法和思路,使电气设计师对这几种地库弱电系统设计有初步了解。 相似文献
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高等学校校园建筑不同于一般的工业和民用建筑,是一个有机联系的整体,具有显著园区能耗的特点,绿色建筑技术在高等学校中有很好的利用前景.本文通过对3所高校建筑用能的分析,指出在照明、绿化和景观用水、洗浴用热水中采用绿色建筑技术,可有效的节约能源消耗.为高校开展节能减排、建设绿色校园提供参考. 相似文献
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Police Accident Reports (PAR) reveal that in a 5-year period between 1993 and 1997, there were 892 crashes at 87 two lane, undivided roadway sites in Strafford County, NH, a county consisting of suburban and rural communities. The purpose of this paper is to describe: (1) logistic regression model building efforts to identify statistically significant factors that predict the probabilities of crashes and injury crashes; and (2) to use these models to perform a risk assessment of the study region. The models are functions of factors that describe a site by its land use activity, roadside design, use of traffic control devices and traffic exposure. Comparative risk assessment results show village sites to be less hazardous than residential and shopping sites. Residential and shopping sites, which are distinctly different from village sites, reside in single-purpose, land-use zones consisting mostly of single-family dwelling units and roadside shopping units with ample off-street parking. Village sites reside in multi-purpose, land-use zones permitting a combination of activities found in residential, shopping and commercial areas. They are pedestrian friendly, that is, have sidewalks and crosswalks, permit onstreet parking, have speed limits and other amenities that promote walking. Adjusted odds ratios and other comparative risk measures are used to explain why one site is more hazardous than another one. For example, the probability of a crash is two times more likely at a site without a sidewalk than at a site with one. The implications on roadway design to improve safety are discussed. 相似文献
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吕政 《制冷空调与电力机械》2007,28(5):67-69
利用气象温度基础数据,编制建筑能耗模拟程序对建筑围护结构进行动态负荷计算和对比分析;通过计算数据,分析不同设计围护结构的传热性能和热稳定性,为具体应用需要提供选择合适的设计和评价依据。 相似文献
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《Mauerwerk》2018,22(4):260-272
Brazilian structural concrete and clay block masonry construction shares many common features with construction all over the world: blocks of a similar shape are bedded in mortar, vertical and horizontal reinforcement is placed in grouted cells, engineering analysis and design follows universal principles and local design codes mimic those adopted elsewhere. However, loadbearing masonry construction in Brazil has become one of the most preferred high‐rise building systems due to its cost‐effectiveness and ease of construction compared to normal reinforced concrete solutions. This paper provides an overview of loadbearing masonry building in Brazil, including case studies on notable high‐rise masonry structures, with an overview of how Brazilian materials, codes and practices differ from the rest of the world. Finally, the paper explains how the use of high‐strength units assists the growing demand for taller and taller buildings and provides insight into why owners and general contractors often prefer to use structural masonry. 相似文献
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参考学术界对低碳建筑的定义,结合节能建筑以及对低碳建筑的认识,从狭义和广义两方面提出低碳建筑的定义,并从全寿命周期的角度,对各利益相关方:政府、开发商、设计单位、施工单位、材料设备供应单位、咨询机构、低碳技术研发机构、信贷机构、专业评估检测机构、物业管理单位以及公众,进行了系统的分析;提出了低碳建筑市场利益相关方关系图,同时将低碳建筑分为决策阶段、设计阶段、施工建造阶段、运营维护阶段与拆除报废阶段共计5个阶段;设计了各个阶段低碳建筑利益相关方因果关系图,对各利益相关方的动态关系做出了具体分析。 相似文献