共查询到20条相似文献，搜索用时 15 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
2.
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
3.
控制系统中的时滞现象是影响控制效果的不可忽视的因素。文章采用递归响应法对磁流变阻尼控制系统的算法进行仿真计算,分析在不同情况下递归响应法对磁流变阻尼控制系统的时滞补偿效果,并与主动控制系统进行比较。结果表明,递归响应法对磁流变阻尼控制系统有一定的补偿效果,对主动控制系统效果更加显著。 相似文献
4.
The grisliness after-effects can be induced by explosion accident with the collapsing of the structures, the demolishing of the equipments and the casualty of the human beings. Isolation belt constructed between the blast point and the construction is one of the useful design schemes for blast resistance. The nonlinear procedure ANSYS/LSDYNA970 is used to simulate the contact detonation and the isolation belt of blast resistance filled with the air or water respectively. The results indicate that the maximal damage can be caused by the contact detonation, and the isolation belt of blast resistent filled with water can reduce the damage greatly. 相似文献
5.
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
6.
HUAN Shi JIANG Guoping Chen Shengming TANG Xiangqian 《天津大学学报(英文版)》2006,12(B09):158-160
The grisliness after-effects can be induced by explosion accident with the collapsing of the structures, the demolishing of the equipments and the casualty of the human beings. Isolation belt constructed between the blast point and the construction is one of the useful design schemes for blast resistance. The nonlinear procedure ANSYS/LSDYNA970 is used to simulate the contact detonation and the isolation belt of blast resistance filled with the air or water respectively. The results indicate that the maximal damage can be caused by the contact detonation, and the isolation belt of blast resistent filled with water can reduce the damage greatly. 相似文献
7.
INTRODUCTIONAlthoughmanyeffortsweremadeoverthepastdecadestounderstandthedynamicbehaviorofcable-stayedbridges(WilsonandGravelle,1991),verylittlehasbeenreportedintheliteratureabouttheirseismicresponse-controlanalysis.Eveninthosestudiesreported,onlyuniformearthquakemotionwasassumedalongtheentirebridge(NiandSpencer,2000;Jungetal.,2001;Yozo,2002).Thisassumption,however,maybeunrealisticforlongspanbridgessincethedifferencesingroundmotionamongdifferentsupportsduetotravelingseismicwavesmayresult… 相似文献
8.
半主动控制起落架实验系统 总被引：1，自引：0，他引：1
介绍了半主动控制起落架实验系统的组成,提出了半主动控制的实验方案,并对振动模块、结构模块、数据采集模块和控制模块进行了分析。在建立起落架减振系统力学模型的基础上,提出了提高起落架性能的半主动控制的控制律。本实验系统具有综合性、通用性和先进性的特点。 相似文献
9.
针对现场固定空燃比燃烧导致无法根据波动燃气热值匹配最佳助燃空气,使热风炉热损失增加;残氧检测仪直接检测热风炉烟道残氧量,将导致氧化锆损耗快、高炉煤气费用计量单一等问题.针对以上问题设计一种残氧燃气分析系统,该系统并行于热风炉控制系统的前馈控制,将少量高炉煤气、空气先通入该系统进行燃烧并调整自身空燃比,得到最佳空燃比作用... 相似文献
10.
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
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.
Experimental Studies on High-Frequency Performance of the Inverse Control Magneto-Rheological Damper
Severe vibration of underground structures may be induced under blast loads. According to the characteristics of the explosion-induced ground shock wave, a new-type damper, inverse control magneto-rheological(MR) damper was designed to control the vibration. The high-frequency performance test of the MR damper was carried out on the small shaking table. It is shown that the performance can be modeled by use of the modified Bouc-Wen model, and the parameters of the model keep stable in the ranqe of 15-50 Hz. 相似文献
13.
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
14.
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
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16.
为改善传统PID的控制缺陷,提出了BP神经网络PID控制算法应用于高炉TRT顶压控制系统中的设计构想,并针对影响高炉炉顶压力稳定的两个重要参数,运用Matlab软件进行仿真,结果表明,该优化控制算法对高炉顶压控制系统的控制效果明显优于传统PID。 相似文献
17.
GONG Shunfeng LU Yong GAO Feng JIN Weiliang 《天津大学学报(英文版)》2006,12(B09):248-253
For a building structure subjected to impulsive loading, particularly shock and impact loading, the response of the critical columns is crucial to the behaviour of the entire system during and after the blast loading phase. Therefore, an appropriate evaluation of the column response and damage under short-duration impulsive loading is important in a comprehensive assessment of the performance of a building system. This paper reports a dynamic analysis approach for the response of RC columns subjected to impulsive loading. Considering that the dynamic response of a column in a frame structure can also be affected by the floor movement which relates to the global vibration of the frame system, a generic column-mass model is used, in which a concentrated mass is attached to the column top to simulate the effect of a global vibration. To take into account the high shear effect under impulsive load, the model is formulated using Timoshenko beam theory, and three main nonlinear mechanisms are considered. Two typical scenarios, one under a direct air blast loading, and another under a blast-induced ground excitation, are analyzed and the primary response features are highlighted. 相似文献
18.
For a building structure subjected to impulsive loading, particularly shock and impact loading , the response of the critical columns is crucial to the behaviour of the entire system during and after the blast loading phase. Therefore, an appropriate evaluation of the column response and damage under short-duration impulsive loading is important in a comprehensive assessment of the performance of a building system. This paper reports a dynamic analysis approach for the response of RC columns subjected to impulsive loading. Considering that the dynamic response of a column in a frame structure can also be affected by the floor movement which relates to the global vibration of the frame system, a generic column-mass model is used, in which a concentrated mass is attached to the column top to simulate the effect of a global vibration. To take into account the high shear effect under impulsive load, the model is formulated using Timoshenko beam theory, and three main nonlinear mechanisms are considered. Two typical scenarios, one under a direct air blast loading, and another under a blast-induced ground excitation, are analyzed and the primary response features are highlighted. 相似文献
19.
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
20.
Simulation of Airblast Load and Its Effect on RC Structures 总被引：1，自引：0，他引：1
In the analysis of a structure subjected to an explosion event, the determination of the blast load constitutes a crucial step. The effect of the blast load on the structure depends not only on the peak shock overpressure, but also the impulse (hence the duration). For structures with a regular geometry, the blast load may be fairly well estimated using appropriate empirical formulae; however, for more complex situations, a direct simulation using appropriate computational techniques is necessary. This paper presents a numerical simulation study on the prediction of the blast load in free air using a hydrocode, with focus on the sensitivity of the simulated blast load to the mesh grid size. The simulation results are compared with empirical predictions. It is found that the simulated blast load is sensitive to the mesh size, especially in the close-in range, and with a practically affordable mesh grid density, the blast load tends to be systematically underestimated. The study is extended to internal blast cases. An example concrete slab under internal explosion is analyzed using a coupled analysis scheme. The internal blast load from the simulation is examined and the response of the RC slab is commented. 相似文献