排序方式: 共有139条查询结果,搜索用时 328 毫秒
91.
结合广西壮族自治区旧沥青路面冷再生技术应用实例,研究高温多雨气候条件下再生混合料的抗干缩性能和抗冲刷性能,对类似工程的施工具有重要的参考价值。 相似文献
92.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1872-1893
The main objective of this work is to determine the limit of safe driving conditions by identifying the maximal friction coefficient in a real vehicle. The study will focus on finding a method to determine this limit before reaching the skid, which is valuable information in the context of traffic safety. Since it is not possible to measure the friction coefficient directly, it will be estimated using the appropriate tools in order to get the most accurate information. A real vehicle is instrumented to collect information of general kinematics and steering tie-rod forces. A real-time algorithm is developed to estimate forces and aligning torque in the tyres using an extended Kalman filter and neural networks techniques. The methodology is based on determining the aligning torque; this variable allows evaluation of the behaviour of the tyre. It transmits interesting information from the tyre–road contact and can be used to predict the maximal tyre grip and safety margin. The maximal grip coefficient is estimated according to a knowledge base, extracted from computer simulation of a high detailed three-dimensional model, using Adams® software. The proposed methodology is validated and applied to real driving conditions, in which maximal grip and safety margin are properly estimated. 相似文献
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构建了基于Matlab/Simulink的EPS系统模型、H.B.Pacejka轮胎模型以及三自由度整车模型,进而应用系统集成的方法构建了集成仿真模型,在此基础上分析了EPS系统对方向盘瞬态响应品质的影响并验证了助力控制策略。结果表明集成仿真模型具有较好的动态模拟特性,EPS具有较好的稳定性且控制策略能够较好的协调转向轻便性与路感的矛盾。 相似文献
95.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):419-432
This work discusses the motorcycle engine-to-slip dynamics which are strictly related to the traction control design. A street motorcycle is analysed by means of an advanced mathematical model which also includes the tyre flexibility and the transmission compliance. The effects of the following parameters on engine-to-slip dynamics are investigated: vehicle speed, engaged gear ratio, sprocket absorber flexibility and road properties. Guidelines for increasing the maximum achievable closed-loop bandwidth are given. 相似文献
96.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):639-656
This paper analyses the dynamic response of a motorcycle with an anti-lock brake system (ABS) and camber or steering angle. Most studies have assumed that motorcycles brake in a straight line – that is, without a steering or camber angle. In this work, the performance of an ABS modulator is designed and analysed at first. Then, a controller is designed for motorcycle turning. The controller uses angular acceleration and the pressure value in brake calipers on the front and rear wheels, camber angle and lateral acceleration as commands to control brake pressure on each wheel to prevent wheel locking. The equation of motion for a motorcycle is based on Weir's equations. This motorcycle model combines a mathematical equation of the ABS modulator, tyre model and controller in simulations. 相似文献
97.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(8):1093-1116
Direct yaw moment control (DYC), which differentially brakes the wheels to produce a yaw moment for the vehicle stability in a steering process, is an important part of electric stability control system. In this field, most control methods utilise the active brake pressure with a feedback controller to adjust the braked wheel. However, the method might lead to a control delay or overshoot because of the lack of a quantitative project relationship between target values from the upper stability controller to the lower pressure controller. Meanwhile, the stability controller usually ignores the implementing ability of the tyre forces, which might be restrained by the combined-slip dynamics of the tyre. Therefore, a novel control algorithm of DYC based on the hierarchical control strategy is brought forward in this paper. As for the upper controller, a correctional linear quadratic regulator, which not only contains feedback control but also contains feed forward control, is introduced to deduce the object of the stability yaw moment in order to guarantee the yaw rate and side-slip angle stability. As for the medium and lower controller, the quantitative relationship between the vehicle stability object and the target tyre forces of controlled wheels is proposed to achieve smooth control performance based on a combined-slip tyre model. The simulations with the hardware-in-the-loop platform validate that the proposed algorithm can improve the stability of the vehicle effectively. 相似文献
98.
为减少和避免轮胎在使用过程中出现异常损坏,延长轮胎使用寿命,对RTG大车轮胎在日常使用中出现的异常损坏现象加以分析。对轮胎常见异常损坏位置分布进行统计,对异常损坏原因进行分析。提出了在RTG大车轮胎维护过程中的注意事项和延长轮胎使用寿命的方法和措施。 相似文献
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高速公路爆胎事故的影响因素及其预防 总被引:1,自引:0,他引:1
通过调查和实验分析,影响爆胎事故的有轮胎气压、车辆装载质量、行车速度和轮胎磨损4个主要因素,高速公路的道路特点和车辆的运行特点(如高速度、重装载、远距离)对这些因素有着直接的影响,控制这些因素所带来的影响,可以有效地预防高速公路爆胎事故的发生。 相似文献
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