共查询到17条相似文献，搜索用时 140 毫秒
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
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邱浩 《深圳职业技术学院学报》2006,5(4):14-17
以汽车半主动悬架为研究对象,建立了汽车二自由度1／4车体模型,提出了一种汽车半主动悬架的神经网络控制方法,设计了神经网络控制器,并利用MATLAB进行仿真。仿真结果表明,该神经网络控制器用于半主动悬架的车身加速度和车身重心高度位移控制是行之有效的。 相似文献
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磁流变液是一种流变特性随施加磁场强度大小和方向而变化的粘性流体,磁流变阻尼器是一种智能型主动控制的执行装置,在汽车行业已经引起高度关注,国内外相关专家对其进行了广泛研究。本文详细综述了磁流变阻尼器动力学模型的研究现状,分析了各种模型的优缺点,讨论了目前磁流变阻尼器研究中有待解决的问题。认为有必要加强减振器结构参数、振动信号特性、负载等与所需阻尼力关系的研究,加强神经网络和模糊逻辑等现代智能控制技术在磁流变阻尼器控制方面的研究,这是解决磁流变技术工程应用问题的有效途径。 相似文献
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由于磁流变液具有很高的黏度,混入其中的气泡很难被排除干净,从而导致磁流变阻尼器产生力滞现象,为了分析混入空气对磁流变阻尼器半主动控制效果的影响,开展了磁流变阻尼器在不同工况下的力学性能试验,分析了电流、位移幅值和激励频率对力滞现象的影响.采用简化的Bouc-Wen模型和一小刚度弹簧来模拟试验中由于混入空气导致的力滞现象,并采用基于加速度反馈的clipped-optimal控制策略对一个加入磁流变阻尼器的单自由度结构进行了半主动控制分析.数值结果表明:混入的空气会降低磁流变阻尼器的半主动控制效果,随着混入空气含量的增加,磁流变阻尼器的半主动控制效果会逐渐趋于passive-off控制下的被动减震效果. 相似文献
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杨婷 《贵阳学院学报(自然科学版)》2023,(1):63-68
车辆悬架对于车辆行驶时的平顺性和操控性都有直接影响,半主动悬架利用智能算法对悬架系统智能调节更能增加车辆在行驶时的平顺性。通过建立路面模型和悬架数学模型,分析了路面不平度函数和时域表达式。确定了悬架评价指标,然后通过建立误差动力学模型、切换面设计、模型确定三个步骤完成了悬架控制器的设计,最后针对汽车右前轮独立悬架系统使用Simulink可视化仿真软件等工具进行1/4悬架系统的仿真模拟分析,最终结合评价系统的三项指标得出仿真结果。通过算法设计与仿真分析,系统地分析了半主动悬架系统对汽车行驶状态的改善情况,为汽车半主动悬架的进一步发展提供资料和实验数据上的参考。 相似文献
6.
《实验室研究与探索》2016,(6):18-20
针对辅机双层隔振系统,采用基于磁流变阻尼器的半主动控制技术研究了其振动传递特性。结果表明:基于磁流变阻尼技术的半主动双层隔振系统的隔振效果要明显优于传统的双层被动隔振系统;采用同一种控制策略,磁流变阻尼器放置在上层时系统的隔振效果较好,传递力降低30%以上;采用半主动相对控制时双层辅机隔振系统的隔振效果要比半主动开关控制要好,系统传递力在上层采用相对控制策略比采用开关控制策略降低27%,系统传递力在下层采用相对控制策略比采用开关控制策略时降低28%。 相似文献
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建立了半主动悬架支撑下1/4车的振动模型,推导了其运动微分方程,运用matlab/simulink工具箱模拟了汽车在40m/s和100m/s两种工况作用下B级路面的随机激励,并编写了1/4车模型在随机激励作用下频域响应求解的仿真框图程序。结果表明,带有PID控制器的半主动悬架与被动悬架相比,明显地降低了车身加速度,即明显改善了汽车平顺性：在时速为40m/s时,车体的振动能量峰值减少了69.8%;在时速为100m/s时,车体的振动能量峰值减少了65.5%;相较于高速工况下,半主动悬架在车速为中低速时,对于平顺性的改善的作用更加明显。 相似文献
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设计了一种半主动力跟踪PI控制器，对由磁流液(MR)阻尼器作为悬架阻尼器的汽车模型进行控制分析．MR阻尼器的2种不同模型在闭环的汽车悬架控制系统模型中得到了应用．2种模型是基于均值阻尼力对速度(f-v)特性的均值F-v模型，和描述阻尼力非光滑滞环和饱和特性的滞环f-v模型．汽车模型用来研究力跟踪PI控制算法和MR阻尼器对车辆的振动抑制性能．仿真分析还指出了MR阻尼器的非线性，特别是滞环特性对汽车悬架系统的性能影响．结果表明所提出的控制方法对由MR阻尼器驱动的汽车悬架系统能产生很好的减振效果，不仅体现在对悬架弹簧支撑车厢的共振抑制和对驾乘人员舒适性敏感频域的振动抑制，还体现在对汽车轮胎共振频率周围的振动抑制．结果还进一步说明了MR阻尼器所存在的滞环特性对汽车悬架性能的不良影响． 相似文献
11.
郑玲 《重庆大学学报(英文版)》2003,2(1)
~~under the sliding mode controller. It shows that the sliding mode controller yield almost perfect tracking to the reference model. It can be seen in Fig.6 that the acceleration of sprung mass under sliding mode controller is controlled within ?.7 m/s2. Fig.7 shows the robustness and stability of the sliding mode controller to the parameter variations of the system to be controlled, in this case, a relative decrease of 10 % in the sprung mass and a relative increase of 15 % in the stiffness o… 相似文献
12.
A new sliding mode controller for semi-active suspension system with magnetorheological (MR) damper is presented in this paper. In the proposed sliding mode controller, a semi-active suspension based on the skyhook damper system is chosen as the reference model to be followed, and the control law is so determined that the asymptotically stable error dynamics occurs between the controlled state and the reference model state. Numerical simulations are carried out to study the performance of the new sliding mode controller. The results show that the proposed controller yields almost perfect tracking to the reference model and has a high robustness against model parameter uncertainties and disturbances. 相似文献
13.
A new kind of fuzzy control scheme, based on the identification of the signal's main frequency and the behavior of the ER
damper, is proposed to control the semi-active suspension system. This method adjusts the fuzzy controller to achieve the
best isolation effect by analyzing the main frequency's characters and inspecting the change of system parameters. The input
of the fuzzy controller is the main frequency and the optimal damping ratio is the output. Simulation results indicated that
the proposed control method is very effective in isolating the vibration.
Project (No. 69974024) supported by the National Natural Science Foundation of China 相似文献
14.
On the basis of analyzing the system constitution of vehicle semi-active suspension,a 4-DOF(degree of freedom)dynamic model is established.A tunable fuzzy logic controller is designed by using without quantification method and taking into account the uncertainty,nonlinearity and complexity of parameters for a vehicle suspension system.Simulation to test the performance of this controller is performed under random excitations and definite disturbances of a C grade road,and the effects of time delay and changes of system parameters on the vehicle suspension system are researched.The numerical simulation shows that the performance of the designed tunable fuzzy logic controller is effective,stable and reliable. 相似文献
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INTRODUCTIONRoadvehiclesuspensiondesignhasreceivedgreatattentioninrecentyears .Theperformanceofthesuspensionsystemplaysanimportantroleinachievinggoodhandlingandridingcomfort.Practically ,thesimplestandmostcommontypesofsuspensionsarepassiveinthesensethatno… 相似文献
16.
This paper presents a semi-active strategy for seismic protection of a benchmark cable-stayed bridge with consideration of multiple-support excitations. In this control strategy, Magnetorheological (MR) dampers are proposed as control devices, a LQG-clipped-optimal control algorithm is employed. An active control strategy, shown in previous researches to perform well at controlling the benchmark bridge when uniform earthquake motion was assumed, is also used in this study to control this benchmark bridge with consideration of multiple-support excitations. The performance of active control system is compared to that of the presented semi-active control strategy. Because the MR fluid damper is a controllable energy- dissipation device that cannot add mechanical energy to the structural system, the proposed control strategy is fail-safe in that bounded-input, bounded-output stability of the controlled structure is guaranteed. The numerical results demonstrated that the performance of the presented control design is nearly the same as that of the active control system; and that the MR dampers can effectively be used to control seismically excited cable-stayed bridges with multiple-support excitations. 相似文献
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INTRODUCTIONAlthoughmanyeffortsweremadeoverthepastdecadestounderstandthedynamicbehaviorofcable-stayedbridges(WilsonandGravelle,1991),verylittlehasbeenreportedintheliteratureabouttheirseismicresponse-controlanalysis.Eveninthosestudiesreported,onlyuniformearthquakemotionwasassumedalongtheentirebridge(NiandSpencer,2000;Jungetal.,2001;Yozo,2002).Thisassumption,however,maybeunrealisticforlongspanbridgessincethedifferencesingroundmotionamongdifferentsupportsduetotravelingseismicwavesmayresult… 相似文献