共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1461-1474
A numerical method for the time-optimal control of the race car is presented. The method is then used to perform the role of the driver in numerical simulations of manoeuvres at the limit of race car performance. The method does not attempt to model the driver but rather replaces the driver with methods normally associated with numerical optimal control. The method simultaneously finds the optimal driven line and the driver control inputs (steer, throttle and brake) to drive this line in minimum time. In principle, the method is capable of operation with arbitrarily complex vehicle models as it requires only limited access to the vehicle model state vector. It also requires solution of the differential equation representing the vehicle model in only the forward time direction and is hence capable of simulating the full vehicle transient response. 相似文献
3.
4.
G. F. Hayhoe 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1979,8(1):49-72
A model of driver behavior is described which is based on a current theory of neurophysiological processes occurring in the cerebellum. The model learns to control the vehicle through experience, provides discontinuous ramp steer inputs to the vehicle, accepts discontinuous input data, and is applicable to all control situations.
The model is implemented on a simple simulation model of a car and learning is accomplished by the use of an explicit driver model which drives the vehicle along a specified trajectory. 相似文献
The model is implemented on a simple simulation model of a car and learning is accomplished by the use of an explicit driver model which drives the vehicle along a specified trajectory. 相似文献
5.
为了高效客观准确评估二手车价格,以影响二手车价格评估的因素为研究对象,采用文献法分析筛选出二手车评估价格的11个影响因素并建立了BP神经网络二手车价格评估模型。通过BP神经网络二手车价格评估模型的计算结果显示模型预测价格与实际价格相关系数达到0.96,根据所建模型的连接权值得出了二手车价格评估影响权重值较大的7个因素。最后将影响二手车价格评估的7个主要因素作为输入重构了价格评估模型并重新计算二手车价格得出BP-11模型与BP-7模型计算结果基本一致且Pearson相关性度到0.83。因此本文的研究结果表明:二手车价格评估主要受综合油耗、车辆售后满意度、车龄、车辆可靠性、舒适性、外观、当前里程数的影响,BP神经网络二手车价格评估模型可由这7个因素描述。 相似文献
6.
汽车防追尾碰撞数学模型研究 总被引:10,自引:2,他引:10
为了提高车辆在高速行驶状态下的主动安全性能,研究了处于追尾行驶状态的本车与前车的运动学特征;针对前车的不同运动状态分别推导出了跟车距离的计算模型并分析了模型中3个关键参数的随机性和动态性,对制动迟滞时间提出了基于模糊推理的确定方法,对本车制动减速度和前车的运动加速度提出了比较实用的动态测算公式;另外,研究了防追尾碰撞的控制与执行,建立了动态调整安全制动停车距离的神经网络模型,提出了基于危险裕度判别的安全控制方法。 相似文献
7.
本文基于49CFR Part 575法规对车辆防侧翻评价指标进行初步探索,并利用CarSim软件建立具有高质心特性的SUV车辆模型,对车身、制动系统、转向系统、轮胎及悬架等子模块进行了定义,完成非线性动力学模型的建立,结合汽车动态控制系统,建立车辆防侧翻控制策略,同时,利用CarSim与Matlab/Simulink进行联合仿真,模拟SUV在极限工况Fishhook环境下的工作情况,验证防侧翻的作用效果,结果表明:防侧翻策略有效的减小了侧向加速度,使得车辆的抗侧翻能力有所增强,汽车的安全性与稳定性得到了有效的保证,为实车试验提供科学依据。 相似文献
8.
P.J.Th. Venhovens A.C.M. Van Der Knaap H.B. Pacejka 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1993,22(5):359-381
The paper discusses the attitude and vibration control of a passenger car on the basis of a full vehicle model. The analysis presented consists of two parts: (I) The introduction of a newly developed semi-active anti-roll/pitch system, (ii) An example of an actively suspended full vehicle model using a simple control strategy to improve ride comfort. The attitude control using semi-actively generated compensation forces prevents the car from rolling in curves and pitching during braking or accelerating. The strength of the system is the small energy consumption. The performance of the combination of both attitude and vibration control can compete with a fully active suspension system. 相似文献
9.
10.
S. Salehinia A. Ghaffari A. Khodayari M. N. Khajavi F. Alimardani 《International Journal of Automotive Technology》2016,17(3):535-547
Nowadays, car following models, as the most popular microscopic traffic flow modeling, are increasingly being used by transportation experts to evaluate new Intelligent Transportation System (ITS) and Advanced Driver Assistance Systems (ADAS) applications. The control of car following is essential due to its safety and its operational efficiency. For this purpose, this paper builds a model of car following behavior based on ARMAX structure from a real traffic data set and presents a Model Predictive Control (MPC) controller. An important advantage of this type of control is its ability to cope with constraints on controls. Since safety and operational efficiency are constraints for car following, therefore we have recruited this type of controller in this study to deal with these constraints. Based on the relative distance and relative acceleration of each instant, the MPC predicts the future behavior of the leader vehicle (LV) and according to this behavior, the acceleration of the follower vehicle (FV) is controlled. The MPC tries to control this acceleration in a way to keep the relative distance at a safe region. To investigate the performance of the designed controller, the result of the system is compared with the behavior of human drivers with similar initial conditions. Also, some other test performances were accomplished to investigate other features such as robustness and the stability of the designed MPC. The simulation results show that the MPC controller has a behavior much safer than that of real drivers and it can provide a pleasant trip for passengers. 相似文献
11.
12.
Antony Snell 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1998,29(5):277-307
An automatic tilt control strategy for a narrow commuter vehicle is described. Such a vehicle would be enclosed like a conventional car but would bank into turns like a motorcycle and so it would feel quite unconventional to drive. The proposed tilt control system uses the steering to tilt the car over like a motorcycle but this is augmented by actively generating a rolling moment about the pivot axis between the tilting upper body and non-tilting base. The provision of this active direct tilt control enables the vehicle to remain upright at low or zero speed and also permits the designer to fine tune the transient roll response. Although it appears complex the proposed tilting control relies on only a few simple sensor measurements, some modest, microprocessor based signal processing and low power, low bandwidth steering and tilt control actuators which might be derived from existing automotive components. 相似文献
13.
14.
In this paper, a proposed car-following driver model taking into account some features of both the compensatory and anticipatory model representing the human pedal operation has been verified by driving simulator experiments with several real drivers. The comparison between computer simulations performed by determined model parameters with the experimental results confirm the correctness of this mathematical driver model and identified model parameters. Then the driver model is joined to a hybrid vehicle dynamics model and the moderate car following maneuver simulations with various driver parameters are conducted to investigate influences of driver parameters on vehicle dynamics response and fuel economy. Finally, major driver parameters involved in the longitudinal control of drivers are clarified. 相似文献
15.
基于车辆不同行驶状态(路面不平度和车速)下悬挂质量垂向加速度和悬架动挠度响应不相同的客观事实,针对半主动悬架PID控制器无自适应能力的局限,以悬挂质量垂向加速度和悬架动挠度响应作为车辆行驶状态的识别判据.建立起一种引入行驶状态识别的半主动悬架PID控制修正算法,进而以某型轿车为对象,采用MATLAB/Simulink建立起半主动悬架PID控制的仿真模型,针对不同行驶状态计算出PID控制算法修正前、后的车辆平顺性响应并加以对比,表明所提出的PID控制修正算法是有效的。 相似文献
16.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5-6):359-381
SUMMARY The paper discusses the attitude and vibration control of a passenger car on the basis of a full vehicle model. The analysis presented consists of two parts: (I) The introduction of a newly developed semi-active anti-roll/pitch system, (ii) An example of an actively suspended full vehicle model using a simple control strategy to improve ride comfort. The attitude control using semi-actively generated compensation forces prevents the car from rolling in curves and pitching during braking or accelerating. The strength of the system is the small energy consumption. The performance of the combination of both attitude and vibration control can compete with a fully active suspension system. 相似文献
17.
轿车白车身的模态特性是控制汽车振动特性的关键,与整车NVH等重要特性密切相关,文章介绍了有限元模型的建立方法,并运用ANSYS软件在建立的轿车白车身有限元模型的基础上进行模态分析,通过白车身模态试验验证了模型的准确性,进而可以通过模型进行模态分析得出白车身的动态特性,为白车身的进一步优化分析提供一个很好的基础。 相似文献
18.
L. Balamurugan J. Jancirani M. A. Eltantawie 《International Journal of Automotive Technology》2014,15(3):419-427
In this paper, analytical characterization of the magneto-rheological (MR) damper is done using a new modified algebraic model. Algebraic model is also more preferable because of its low computational expenses compared to differential Bouc-Wen’s model which is highly computationally demanding. This model along with the obtained model parameters is used as a semi-active suspension device in a quarter car model and the stationary response of the vehicle traversing on a rough road is obtained. The control part consists of two nested controllers. One of them is the system controller which generates the desired damping force and the other is the damper controller which adjusts the voltage level to MR damper so as to track the desired damping force. For the system controller a model reference skyhook Sliding Mode Controller (SMC) is used and for the damper controller a continuous state algorithm is built to determine the input voltage so as to gain the desired damping force. The analytical model is subsequently used in the quarter car vehicle model and the vehicular responses are studied. A simulation study is performed to prove the effectiveness and robustness of the semi-active control approach. Results show that the semi-active controller can achieve compatible performance as that of active suspension controller except for a little deterioration. 相似文献
19.
20.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):277-307
SUMMARY An automatic tilt control strategy for a narrow commuter vehicle is described. Such a vehicle would be enclosed like a conventional car but would bank into turns like a motorcycle and so it would feel quite unconventional to drive. The proposed tilt control system uses the steering to tilt the car over like a motorcycle but this is augmented by actively generating a rolling moment about the pivot axis between the tilting upper body and non-tilting base. The provision of this active direct tilt control enables the vehicle to remain upright at low or zero speed and also permits the designer to fine tune the transient roll response. Although it appears complex the proposed tilting control relies on only a few simple sensor measurements, some modest, microprocessor based signal processing and low power, low bandwidth steering and tilt control actuators which might be derived from existing automotive components. 相似文献