共查询到19条相似文献，搜索用时 62 毫秒
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萤火虫算法（FA）是继粒子群算法、遗传算法、模拟退火算法等经典智能算法之后,由剑桥学者YangXin-she提出的一种模仿自然界萤火虫捕食、求偶行为的新颖的群体智能随机优化算法。该算法近年来逐渐在不同优化领域得以成功应用,但也存在易陷入局部最优、算法过早收敛等问题,为此许多学者对萤火虫算法进行了改进。针对基于惯性权重的萤火虫算法、基于混沌算法的萤火虫算法这两种改进算法,通过几种标准检验函数对各算法的性能进行详细的仿真、比较,得出具体试验结果。在控制系统PID参数优化中应用改进后的萤火虫算法,仿真结果表明改进后的萤火虫算法寻优精度和搜索速度均优于基本粒子群算法。 相似文献
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《实验室研究与探索》2017,(5):44-47
路面的激励作用会使车辆在行驶过程中产生颠簸和振动,严重影响汽车行驶平顺性和乘坐舒适性。建立了1/4汽车主动悬架数学模型,提出一种基于模糊神经网络的控制策略。该方法利用了模糊控制鲁棒性强和神经网络控制收敛速度快的特点,对系统参数进行实时在线调整;同时,以悬架动行程、车轮动载荷以及车身垂直加速度为衡量指标进行仿真分析和测试研究。结果表明,所提出的控制策略可以有效减小汽车在行驶中因路面激励作用而产生的振动,大幅改善了车辆操纵稳定性、汽车行驶平顺性及乘坐舒适性,鲁棒性强,有一定可借鉴意义。 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
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本文以车辆主动悬架系统为研究对象,建立了1/4车辆模型,在此基础上建立simulink模型,并设计了PID控制器,然后运用遗传算法对相关参数进行了优化设计,实现了主动悬架的最优PID控制.最后对比了主、被动悬架的性能指标(车身加速度、悬架动挠度、车轮动位移),结果表明通过本文方法实现的最优PID控制器对于改善车辆的行驶平顺性和稳定性是有效的. 相似文献
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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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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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以车辆悬架系统为研究对象,建立了1/4车辆模型。在路面不平度和发动机惯性力及其转矩两种输入同时存在的条件下,运用遗传算法对悬架参数进行了优化设计。最后对比了优化前后悬架的性能指标(车身加速度、悬架动挠度、车轮动变形),车身加速度改进后(0.94249 m/s2)比改进前(1.52236m/s2)的均方根值降低了约38%,对比结果表明通过本文方法实现的悬架最优化设计对改善车辆的乘坐舒适性及平顺性是有效的。 相似文献
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《实验室研究与探索》2017,(6):93-97
针对标准萤火虫算法(Firefly Algorithm,FA)在求解电力系统优化潮流(OPF)问题上出现的早熟收敛和求解精度不高等问题,引入混沌优化和莱维飞行,形成了混沌莱维萤火虫优化算法(Chaotic Lévy Flightfirely Algorithm,CLFA)。对改进的CLFA算法进行了推导与分析,并将FA和CLFA两种算法对IEEE30节点测试系统进行电力系统优化潮流仿真,用实验证实算法的有效性。仿真结果表明:改进后的CLFA算法避免了早熟收敛,增强了局部搜索能力,提高了求解精度。算法的改进方式具有良好的创新性,学生可以自行开发不同的改进方式,改进后的算法更有利于进行后续的电力系统优化潮流问题研究。 相似文献
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汽车操稳性和平顺性是车辆性能的重要指标,相应的实验是同济大学车辆工程专业本科生的一门重要教学实验内容,但由于设备与车辆限制,学生难以亲自动手。基于多体动力学原理,建立了包含车身、悬架、转向系统、轮胎以及动力系统在内的整车模型,基于该模型在教学实验的讲解过程中引入整车操稳性和平顺性的可视化虚拟实验,加强学生对实验原理和方法的理解。阐述了虚拟实验建模的原理、过程以及在教学实验中的应用,旨在激发学生对实验的兴趣,提高实验教学的质量。 相似文献
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It is crucial to conduct a study of vehicle ride comfort using a suitable physical model, and a precise and effective problem-solving method is necessary to describe possible engineering problems to obtain the best analysis of vehicle vibration based on the numerical model. This study establishes different types of vehicle models with different degrees of freedom (DOFs) that use different types of numerical methods. It is shown that results calculated using the Hamming and Runge-Kutta methods are nearly the same when the system has a small number of DOFs. However, when the number is larger, the Hamming method is more stable than other methods. The Hamming method is multi-step, with four orders of precision. The research results show that this method can solve the vehicle vibration problem. Orthogonal experiments and multi-objective optimization are introduced to analyze and optimize the vibration of the vehicle, and the effects of the parameters on the dynamic characteristics are investigated. The solution F 1 (vertical acceleration root mean square of the vehicle) reduces by 0.0352 m/s2, which is an improvement of 7.22%, and the solution F 2 (dynamic load coefficient of the tire) reduces by 0.0225, which is an improvement of 6.82% after optimization. The study provides guidance for the analysis of vehicle ride comfort. 相似文献
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The least means squares (LMS) adaptive filter algorithm was used in active suspension system. By adjusting the weight of adaptive filter, the minimum quadratic performance index was obtained. For two-degree-of-freedom vehicle suspension model, LMS adaptive controller was designed. The acceleration of the sprung mass,the dynamic tyre load between wheels and road,and the dynamic deflection between sprung mass and unsprung mass were determined as the evaluation targets of suspension performance. For LMS adaptive control suspension, compared with passive suspension, acceleration power spectral density of sprung mass acceleration under the road input model decreased 8-10 times in high frequency resonance band or low frequency resonance band. The simulation results show that LMS adaptive control is simple and remarkably effective. It further proves that the active control suspension system can improve both the riding comfort and handling safety in various operation conditions, and the method is fit for the active control of the suspension system. 相似文献
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毕强 《九江职业技术学院学报》2012,(2):12-14,9
设计了基于freescale单片机的汽车巡航系统控制器,它能够判断设定车速和实际车速之间的差值,采用PID控制算法,对发动机节气门开度进行闭环控制。设计了CAN总线接口,方便系统与其它车载电子系统的通信和信息交换。该控制器结合适当的执行结构,就可以自动保持车辆的定速行驶,减轻了驾驶疲劳,提高了车辆的安全性。 相似文献
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The current method to solve the problem of active suspension control for a vehicle is often dealt with a quarter-car or half-car model.But it is not enough to use this kind of model for practical applications.In this paper,based on considering the influence of factors such as,seat and passengers a MDOF(multi-degree-of-freedom)model describing the vehicle motion is set up.The MODF model,which is 8DOF of four independent suspensions and four wheel tracks,is more applicable by comparison of its analysis result with some conventional vehicle models.Therefore,it is more suitable to use the 8DOF full-car model than a conventional 4DOF half-car model in the active control design for car vibration.Based on the derived 8DOF odel,a controller is designed by using LQ(linear quadratic)control theory,and the appropriate control scheme is selected by testing various performance indexes.Computer simulation 8is carried out for a passenger car running on a road with step disturbance and random road disturbance expressed by Power Spectral Density(PSD).Vibrations corresponding to ride comfort are derived under the foregoing road disturbances.The response results for uncontrolled and controlled system are compared.The response of vehicle vibration is greatly suppressed and quickly damped.which testifies the effect of the active suspenson.The results achieved for various controllers are compared to invesigate the influence of different control schemes on the control effect. 相似文献
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PID控制器是一个具有反馈环节的自动化控制系统,它普遍应用于工业自动化控制领域。智能汽车是指能自动识别路径,并能在规定路径上自动行驶的汽车模型。在探讨PID控制器结构与工作原理的基础上,提出智能汽车车速PID控制器系统的设计思路。 相似文献
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汽车悬架的主动控制非常困难，特别是要处理越野汽车的舒适性和操纵性。越野汽车的悬架位移量非常大，非线性时变特性和阻尼特性非常显。一种能提高主动悬架系统的效率的方法是：保留线性控制方法的优点，同时用线性回馈方法识别并取消非线性特性。介绍了主动悬架的控制策略和军用越野汽车的一种控制方法。 相似文献
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This paper presents the development of a proportional-integral-derivative (PID)-based control method for application to active vehicle suspension systems (AVSS). This method uses an inner PID hydraulic actuator force control loop, in combination with an outer PID suspension travel control loop, to control a nonlinear half-car AVSS. Robustness to model uncertainty in the form of variation in suspension damping is tested, comparing performance of the AVSS with a passive vehicle suspension system (PVSS), with similar model parameters. Spectral analysis of suspension system model output data, obtained by performing a road input disturbance frequency sweep, provides frequency response plots for both nonlinear vehicle suspension systems and time domain vehicle responses to a sinusoidal road input disturbance on a smooth road. The results show the greater robustness of the AVSS over the PVSS to parametric uncertainty in the frequency and time domains. 相似文献