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1.
为改善汽车的平顺性,将模糊控制算法引入半主动悬架,对其控制系统进行研究。首先以四自由度汽车半主动悬架为研究对象建立了其数学模型与仿真模型;在Matlab中利用模糊逻辑工具箱Fuzzy Toolbox设计了半主动悬架模糊控制器;在此基础上,利用Matlab/Simulink软件搭建半主动悬架模糊控制系统并在白噪声路面及阶跃路面信号激励下进行仿真试验。实验结果表明,所设计的模糊控制器可以有效改善汽车的平顺性并提高汽车的行驶安全性。 相似文献
2.
The conventional car-following theory is based on the assumption that vehicles will travel along the center line of lanes.
However, according to the field survey data, in complex traffic conditions, a lateral separation between the leader and the
follower frequently occurs. Accordingly, by taking lateral separation into account, we redefined the equation of time-to-collision
(TTC) using visual angle information. Based on the stimulus-response framework, TTC was introduced into the basic General
Motors (GM) model as a stimulus, and a non-lane-based car-following model of steady-state traffic flow was developed. The
property of flow-density relationship was further investigated after integrating the proposed car-following model with different
parameters. The results imply that the property of steady-state traffic flow and the capacity of each lane are highly relevant
to the microscopic staggered car-following behavior, and the proposed model significantly enhances the practicality of the
human driving behavior model. 相似文献
3.
Shi Fei Zheng Fangjing 《上海大学学报(英文版)》1998,2(4):295-300
ｙ Ｃｏｎｔｒｏｌ Ｂａｓｅｄ ｏｎ Ｇｅｎｅｔｉｃ Ａｌｇｏｒｉｔｈｍ ａｎｄ Ｉｔｓ ＡｐｐｌｉｃａｔｉｏｎｓTX１ＩｎｔｒｏｄｕｃｔｉｏｎＭｅｍｂｅｒｓｈｉｐｆｕｎｃｔｉｏｎｉｓｔｈｅｂａｓｉｓｆｏｒｆｕｚｚｙｌｏｇｉｃｔｈｅｏｒｙｔｏａｐｐｌｉ... 相似文献
4.
为了降低长途旅行中驾驶员的疲劳强度并降低燃料消耗,采用Freescale的16位单片机MC9S12D64设计了汽车巡航控制系统CCS.文章给出了该CCS的硬件框图、软件模块设计框图和巡航状态转换图,并详细介绍了控制软件的设计原则,同时给出安全电磁离合器控制电路的实现,电路以及上位机参数标定和动作测试软件的具体界面. 相似文献
5.
万泉 《深圳信息职业技术学院学报》2006,4(4):14-18,37
本文分析了连接接纳控制策略的相关内容并重点介绍了基于测量的接纳控制算法,提出了新的接纳控制算法来改善VoWLAN的QoS(Quality of Service)性能。该算法对应于不同的业务类型采用不同的时间窗阀值测量机制,根据负载的实时情况动态调整时间窗大小,从而可以改变系统的接纳性能,并提供相应的动态带宽分配机制,有效地保障VoWLAN系统的QoS需求。最后通过仿真实验对该算法进行了验证。 相似文献
6.
The Car-following models is a kind of microscopic simulation model for vehicular traffic, which describe the one-by-one following
behaviors of vehicles in the same traffic lane. As a common traffic phenomenon, following behavior is of great importance
in the micro-study of intelligent traffic control. Compared with other traffic-flow models, car-following model embodies the
human factors and reflects the real traffic situation in a better way. This paper gives a systematic review of the development
and actuality of car-following models by introducing and analyzing in detail the advantages and disadvantages of GHR model,
OV model, CA model and fuzzy-logic model. In addition, local stability and asymptotic stability of car-following models are
discussed in this paper. 相似文献
7.
减法聚类和粒子群优化TS模糊神经网络的驾驶疲劳融合检测(英文) 总被引：3，自引：0，他引：3
为提高基于单一特征检测算法的准确率和可靠性,提出基于多个特征的驾驶疲劳融合检测算法.从直接反映驾驶员疲劳的2个面部特征和间接反映疲劳的1个车辆行为特征2个方面对驾驶疲劳进行综合检测.该算法运用TS模糊神经网络来识别驾驶疲劳,采用减法聚类对网络进行结构辨识,确定模糊规则的条数及相关参数的初始值,并改进了粒子群优化算法对网络进行训练.仿真和实车实验表明,该算法不仅能有效改善TS模糊神经网络的收敛速度和识别精度,而且能提高驾驶疲劳的检测正确率. 相似文献
8.
有源电力滤波器（active power filter, APF）补偿电流跟踪控制要求具有较高的稳态精度和较快的动态响应速度。文章将自适应预测滤波算法应用于无差拍控制,实现APF补偿电流精确控制。根据APF时域数学模型,推导滤波系统的无差拍控制离散方程;通过自适应(finite impulse response filter, FIR)预测滤波算法实现基波电流预测,消除控制系统的计算延迟,给无差拍控制提供所需的指令电流预测值。对预测算法进行MATLAB仿真,验证预测算法的稳态精度和动态跟踪快速性;实验室样机验证控制实验结果证明所提出的控制策略有效的,具有一定的实用性。 相似文献
9.
基于应急疏散交通特征的车辆跟驰模型 总被引：1，自引：0，他引：1
提出了一个应急交通疏散车辆跟驰模型（EECM）,模型首次在车辆最小安全间距的动力学推导过程中纳入驾驶员心理行为影响因素,使得跟驰过程更客观地反映在紧急疏散状态下的交通流和疏散驾驶行为特性．通过文献研究分析传统跟驰理论与应急交通疏散跟驰特性的区别,并进一步进行驾驶员问卷调查对应急交通疏散条件下的驾驶心理行为特性进行统计分析,提炼出驾驶员行为差异分布系数和经验判断系数2个参数,并将其纳入车辆安全间距的动力学推导过程,建立了基于驾驶行为特性和最小安全间距的应急交通疏散车辆跟驰模型,应用GPS技术对北京东三环劲松路段高峰小时交通流跟驰数据,对EECM进行了比较验证,结论有力地支持了EECM模型及问卷量化分析的合理性． 相似文献
10.
An important feature of the traffic in mobile networks is burstiness. Drawbacks of conventional power control algorithms for time division duplex （TDD）-code division multiple access （CDMA） systems are analyzed. A joint power control algorithm based on service factor is presented to address the TDD-CDMA mobile services in the burst mode according to the Markov modulated Bernoulli process. The joint power control equation is derived. A function model is developed to verify the new algorithm and evaluate its performance. Simulation results show that the new power control algorithm can estimate interference strength more precisely, speed up convergence of power control, and enhance power efficiency and system capacity. It is shown that the proposed algorithm is more robust against link gain changes, and outperforms the reference algorithms. 相似文献
11.
To improve the handling performance of a steer-by-wire （SBW） vehicle, a series of control logics are proposed. Firstly, an algorithm for enhancing the maneuvering in steady-state cornering is presented. On this basis, two categories of control strategies are used to dynamically correct and compensate the transient state steering responses and vehicle behaviors. Simulator tests including subjective evaluations and virtual field tests are both conducted to make comprehensive investigations on the series of control logics. The subjective evaluations demonstrate that the SBW vehicle with a specifically selected value of steering sensitivity tends to be more desirable for driving than a conventional one in which a fixed steering ratio exists. The virtual field tests indicate that the control strategies for dynamical correction and compensation could effectively improve the handling per- formances of an SBW vehicle by reducing the work load of drivers, enhancingthe track-holding performance, and improving steering response properties. 相似文献
12.
ALIAmirIbrahim QINDa-tong ATTIANabilAbdulla 《重庆大学学报(英文版)》2004,3(2):38-42
In recent years, the sustainable development of automatic manual transmissions (AMTs) control in vehicles is conspicuous. The control applications have grown fast and steadily due to the tremendous progress in power electronics components and the control software that enhance the requirements for delivering higher vehicles performance. AMTs control strategies achieve a reduction in the driveline dynamic oscillations behavior during gear shifting and clutch starting up processes. AMTs future expectations are an increase of torque capacity, more speed ratios and the development of advanced and efficient electronic control systems. This paper concerns with the progressing view of AMTs in the past, today and future, gives an overview of the potential dynamic problems concerned with AMTs and some control strategies used to solve those problems. 相似文献
13.
14.
工程结构振动控制技术与发展 总被引：1，自引：0，他引：1
李金娜 《张家口职业技术学院学报》2008,21(4)
随着社会的发展,人们对建筑结构的性能提出了更高的要求,如发射塔的抗震要求、高层建筑中居住者的舒适感和抗震安全性的要求等。这些实际需求促进了对建筑结构控制的研究,其中,结构振动控制已成为目前结构工程学科中的一个十分活跃的研究领域。 相似文献
15.
WANG Zhi-ying HE Chen 《浙江大学学报(A卷英文版)》2006,7(6):1046-1050
INTRODUCTION Many adaptive modulation (AM) schemes have been proposed for multi-input and multi-output (MIMO) and its derivations to increase the data throughput (June and Rao, 2002; Zhou and Vucetic, 2004a; 2004b; Chen et al., 2004; Zhou and Giannakis, 2004b). By using some kinds of greedy algorithms, all of these AM schemes try to maximize the trans-mission rate for a given transmission power. Their performances under different conditions have been studied deeply. The AM-MIMO w… 相似文献
16.
To elucidate the principles of notable torque and flux ripple during the steady state of the conventional direct torque control (DTC) of induction machines, the factors of influence torque variation are examined. A new torque ripple minimization algorithm is proposed. The novel method eradicated the torque ripple by imposing the required stator voltage vector in each control cycle. The M and T axial components of the stator voltage are accomplished by measuring the stator flux error and the expected incremental value of the torque at every sampling time. The maximum angle rotation allowed is obtained. Experimental results showed that the proposed method combined with the space vector pulse width modulation(SVPWM) could be implemented in most existing digital drive controllers, offering high performance in both steady and transient states of the induction drives at full speed range. The result of the present work imphes that torque fluctuation could be eliminated by imposing proper stator voltage, and the proposed scheme could not only maintain constant switching frequency for the inverter, but also solve the heating problem and current harmonics in traditional induction motor drives. 相似文献
17.
CHEN Yue-hua CAO Guang-yi ZHU Xin-jian 《浙江大学学报(A卷英文版)》2007,8(5):748-754
This paper describes a nonlinear model predictive controller for regulating a molten carbonate fuel cell (MCFC). In order to improve MCFC’s generating performance, prolong its life and guarantee safety, it must be controlled efficiently. First, the output voltage of an MCFC stack is identified by a least squares support vector machine (LS-SVM) method with radial basis function (RBF) kernel so as to implement nonlinear predictive control. And then, the optimal control sequences are obtained by applying genetic algorithm (GA). The model and controller have been realized in the MATLAB environment. Simulation results indicated that the proposed controller exhibits satisfying control effect. 相似文献
18.
针对网络控制系统中的随机延迟会恶化控制品质,甚至使系统变得不稳定这一问题,把标准预测函数控制算法推广到带随机延迟的网络控制系统中,提出了时戳预测函数控制算法.该算法通过时戳方法来估计网络在控制系统中引入的总延迟,根据系统离散的延迟状态空间模型来预测未来输出,并由预测函数控制的思想得到了适用于网络控制系统的控制规律.在基于TrueTime工具箱搭建的网络控制系统仿真平台上,对比了时戳预测函数算法和传统预测函数算法,系统响应曲线显示前者具有更好的控制品质. 相似文献
19.
INTRODUCTIONWiththedevelopmentofscienceandtechnol ogy ,requirementsforthesatisfactoryperformanceofthecontrolprocessesarelargelyenhanced.However,moderncontroltheorybasedonthestate spacemethodcannotmeettherequirementofthepracticalcontrolproblemduetothefactt… 相似文献
20.
针对汽车底盘两系统集成控制由于控制器作用范围有限,使得控制结果难以满足汽车在全工况下整车性及安全性这一问题,本研究综合考虑了汽车的纵向、横向和垂向动力学对整车安全性的影响以及三者之间的关系,并基于14自由度的整车模型建立了PID算法的集成控制器,同时进行了仿真验证。仿真结果表明：多系统的集成控制优于两系统的集成控制,有效地提高了整车的综合性能。 相似文献