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排序方式: 共有52条查询结果,搜索用时 46 毫秒
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行人影响下的信号交叉口通行能力研究 总被引:5,自引:0,他引:5
为量化行人交通对信号交叉口通行能力的影响,分析了行人-机动车冲突点处的行人行为特征和人车运行规律,并描述了行人成群到达的现象。在此基础上,利用车队分析法建立冲突点车辆通行能力模型,并且利用实测数据标定模型参数,为计算行人影响下的信号交叉口通行能力提供了分析依据。模型计算的冲突车流通行能力很大程度取决于有效绿灯时间内冲突点处人车冲突的平均次数。模型计算通行能力总体上低于HCM 2000方法,结果随行人流量增加而呈现的下降趋势渐趋平缓。模型建立在冲突点运行规律基础之上,具有较广泛的适应性。研究为混合交通条件下信号交叉口配时设计与交通管理提供了理论基础。 相似文献
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Based on the distributed control structure and interaction topology modeled by graph theory, a decoupled robust control strategy was presented for a heterogeneous vehicular platoon to deal with the uncertainties of node dynamics. The dynamical behavior of node composed of vehicle dynamics and a lower-level controller was assumed to be covered by a multiplicative uncertainty model. Then to decouple the platoon system, which was skillfully decomposed into a H∞ norm bounded uncertain part and a diagonal system by applying linear transformation and eigenvalue decomposition on communication topology. The requirements of robust stability, tracking ability and vehicular platoon stability were analyzed theoretically. Comparative bench tests with a non-robust controller and different communication topologies were conducted to demonstrate its robust stability, tracking ability and vehicular platoon. 相似文献
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Bass Bernard M.; Avolio Bruce J.; Jung Dong I.; Berson Yair 《Canadian Metallurgical Quarterly》2003,88(2):207
How do leadership ratings collected from units operating under stable conditions predict subsequent performance of those units operating under high stress and uncertainty? To examine this question, the authors calculated the predictive relationships for the transformational and transactional leadership of 72 light infantry rifle platoon leaders for ratings of unit potency, cohesion, and performance for U.S. Army platoons participating in combat simulation exercises. Both transformational and transactional contingent reward leadership ratings of platoon leaders and sergeants positively predicted unit performance. The relationship of platoon leadership to performance was partially mediated through the unit's level of potency and cohesion. Implications, limitations, and future directions for leadership research are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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基于视觉导航的智能小车调速控制器设计 总被引:2,自引:0,他引:2
智能小车控制是构建智能车路系统中汽车列队行驶模拟系统的基础。针对智能小车自主寻迹问题,通过对寻迹路径的偏差及偏差的导数进行模态划分,提出对应的模糊控制规则,进而以DSP TMS320F2812为主控芯片控制智能小车电机的转速,实现智能小车纵向自主控制。模型车运行实验表明智能小车速度调节算法可行。 相似文献
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Performance Comparison of Automated Vehicle Controllers 总被引:1,自引:0,他引:1
1IntroductionAutomatedhighwaysystems穴AHS雪havedrawnmoreandmoreattentioninrecentyearsbecausefullautomationcangreatlyincreasehighwaycapacitywhileimprovingsafety.IneachplatoonofAHS熏everyvehicle穴excepttheleadingcar雪tightlyfollowstheprecedingvehicle熏andcanreactquicklytotheprecedingcarandemergency.Thedesignofintelligentvehiclecontrolsystemisanim鄄portantpartofAHS熏anditinvolvesautomaticcontrolofthrottleandbrake眼1演.Oneoftheobjectivesofintelligentvehiclecontrolistoachieveautomaticvehic… 相似文献
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队列行驶车辆的空气动力特性 总被引:5,自引:2,他引:5
为了研究队列行驶时,车辆前后间距对队列行驶车辆气动特性的影响以及队列中车辆数目对气动阻力系数的影响,采用数值模拟方法分别对智能交通系统中队列行驶车辆11种不同情况下车辆的气动特性分别进行了研究。结果表明:队列行驶车辆随车间距离的缩短,阻力值降低。在固定间距下,随着队列中车辆数目的增加,平均阻力系数可降低20%—30%,阻力最低的车大致处于车队的中心位置。 相似文献
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Toru Yamaguchi Makoto Sato Tomohiro Takagi 《Journal of Intelligent and Robotic Systems》1998,23(2-4):183-199
This paper proposes a multi-agent system that carries out cooperative work. To achieve this, we use Fuzzy Associative Memory Organizing Unit Systems (FAMOUS) and Conceptual Fuzzy Sets (CFS). By using these proposed methods, each agent robot can decide its own behaviour to suit the situation in its environment. We apply this system to an Intelligent Transportation System (ITS) and do simulations. 相似文献
10.
This article focuses on the problem of fixed-time prescribed performance platoon control for heterogeneous vehicles with unknown dead-zone and actuator saturation. First, an equivalent transformation is developed to approximate the actuator nonlinearity (i.e., dead-zone and saturation), which reduces the complexity of controller design. Then, to guarantee the tracking errors converge to the predetermined region in the given time, a modified prescribed performance function is presented. Based on this, a novel adaptive sliding mode control scheme is developed in the context of fixed-time theory, which is proved to be capable of ensuring individual vehicle stability and string stability in fixed time. In addition, under the proposed control scheme, the convergence time is independent of initial conditions of the system. Finally, numerical simulations are carried out to demonstrate the effectiveness of the proposed control scheme. 相似文献