排序方式: 共有39条查询结果,搜索用时 15 毫秒
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黄文轩 《铁路通信信号工程技术》2021,(1):101-108
ZPW-2000A无绝缘轨道电路调谐区由1型调谐单元、钢轨、空心线圈、2型调谐单元构成,本区段所连接的调谐单元显容性,钢轨、空心线圈和邻区段连接的调谐单元呈感性,这两部分形成并联谐振.分析普速铁路Z P W-2000A空心线圈S V A阻抗值对整体谐振电路的影响,提出调谐区小轨道电路品质因数的计算方法,通过提高调谐区品... 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):361-386
Passive fluidically coupled suspensions have been considered to offer a promising alternative solution to the challenging design of a vehicle suspension system. A theoretical foundation, however, has not been established for fluidically coupled suspension to facilitate its broad applications to various vehicles. The first part of this study investigates the fundamental issues related to feasibility and properties of the passive, full-vehicle interconnected, hydro-pneumatic suspension configurations using both analytical and simulation techniques. Layouts of various interconnected suspension configurations are illustrated based on two novel hydro-pneumatic suspension strut designs, both of which provide a compact design with a considerably large effective working area. A simplified measure, vehicle property index, is proposed to permit a preliminary evaluation of different interconnected suspension configurations using qualitative scaling of the bounce-, roll-, pitch- and warp-mode stiffness properties. Analytical formulations for the properties of unconnected and three selected X-coupled suspension configurations are derived, and simulation results are obtained to illustrate their relative stiffness and damping properties in the bounce, roll, pitch and warp modes. The superior design flexibility feature of the interconnected hydro-pneumatic suspension is also discussed through sensitivity analysis of a design parameter, namely the annular piston area of the strut. The results demonstrate that a full-vehicle interconnected hydro-pneumatic suspension could provide enhanced roll- and pitch-mode stiffness and damping, while retaining the soft bounce- and warp-mode properties. Such an interconnected suspension thus offers considerable potential in realising enhanced decoupling among the different suspension modes. 相似文献
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S. Lee 《International Journal of Automotive Technology》2008,9(4):429-436
This paper addresses the application of the perturbation/correlation method to optimizing the torque output of internal combustion
engines. This application was inspired by observations of the limitations in current techniques of the automotive performance
tuning industry. Performance issues such as errors from true optimum spark timing and fuel injector pulse width values as
well as convergence were considered for optimal tuning. The ability of the system to deal with engine cycle-to-cycle variations
and their effect on input parameters is also analyzed. 相似文献
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Silas和Densitune系统在航道工程中的应用 总被引:3,自引:0,他引:3
以连云港港15万t级航道疏浚工程施T期浮泥观测为例,介绍Densitune音叉振动密度仪、Silas适航水深测量系统和悬移质取样器的特性,并根据实测的浮泥层厚度及其分布情况,剖析Silas和Densitune系统在实际工程应用中遇到的问题,供丁程设计和运营管理参考. 相似文献
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郝文洲 《石家庄铁道学院学报》2011,(2):49-51
通过对高速铁路CRTSⅡ型无砟轨道板精调设站和搭接方式的创新,测量设站更加灵活机动,操作方便,既保证了设站位置和定向点的绝对精度,又顾及了不同设站位置之间的相对精度,消除了轨道对接处的微量错动,实现了轨道的平顺、无缝搭接。 相似文献
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CRTSⅢ型板式无砟轨道采用目前施工技术,存在底座线形控制不理想、轨道板翘曲、自密实混凝土层离缝、钢轨精调次数多、施工完成后扣件更换率居高不下等问题,结合我国智慧铁路发展需要,对底座自动寻迹施工技术、轨道板智能化精调技术、自密实混凝土灌注质量监测技术、钢轨精调和精调信息化施工技术等进行了研究,形成了我国自主知识产权的CRTSⅢ型板式无砟轨道智能铺装技术及配套关键设备,为进一步提高我国板式无砟轨道关键工序的施工效率和施工质量提供了技术支撑。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(10):931-953
The influence of suspension tuning of passenger cars on bounce and pitch ride performance has been explored in a number of studies, while only minimal efforts have been made for establishing similar rules for heavy vehicles. This study aims to explore pitch dynamics and suspension tunings of a two-axle heavy vehicle with unconnected suspension, which could also provide valuable information for heavy vehicles with coupled suspensions. Based on a generalised pitch-plane model of a two-axle heavy vehicle integrating either unconnected or coupled suspension, three dimensionless measures of suspension properties are defined and analysed—namely the pitch margin (PM), pitch stiffness ratio (PSR), and coupled pitch stiffness ratio (CPSR)—for different unconnected suspension tunings and load conditions. Dynamic responses of the vehicle with three different load conditions and five different tunings of the unconnected suspension are obtained under excitations arising from three different random road roughness conditions and a wide range of driving speeds, and braking manoeuvres. The responses are evaluated in terms of performance measures related to vertical and pitch ride, dynamic tyre load, suspension travel, and pitch-attitude control characteristics of the vehicle. Fundamental relationships between the vehicle responses and the proposed suspension measures (PM, PSR, and CPSR) are established, based on which some basic suspension tuning rules for heavy vehicles with unconnected suspensions are also proposed. 相似文献
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IntroductionInprocesscontrol,morethan95%ofthecontrolloopsareofPIDtype[1].Themainreasonisitsrelativelysimplestructure,whichcanbeeasilyunderstoodandimplementedinpractice,andthatmanysophisticatedcontrolstrategies,suchasmodelpredictivecontrol,arebasedoni… 相似文献