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31.
This work presents an experiment on the relationships between subjective and objective evaluations of vehicle handling. Ten
cars were examined objectively in several open-loop driving dynamics manoeuvres and subjectively by test persons in typical
traffic situations. Results are extracted from a stationary test (the Slowly Increasing Steer Test), and a dynamical test
(the Frequency Response Test). The subjective measurements are obtained from drivers on a rural road course via a questionnaire,
which was developed to separately investigate the quantity level perception, the so-called “Niveau”, and the more qualitative
“Liking”. These subjective “measurements” are embedded into a two-channel definition of “Steering Comfort” as a genus for
“Steering Discomfort” and “Character”. The article concentrates on developing a statistical method for the consideration of
correlations amongst the subjective/objective data. In doing so, the variance in example subjective Niveau ratings can be
significantly explained by several objective quantities. Indicators for co-domains of validated discomfort characteristics
and hints for endeavouring character Liking ranges are detected. 相似文献
32.
This paper describes the development of an optimal design process for a steering column system and supporting system. A design
guide is proposed at the initial concept stage of the development process to obtain sufficient stiffness of the steering system
while reducing the idle vibration sensitivity of the system. Case studies on resonance isolation are summarized, where vibration
modes among the systems are separated by applying a vibration mode map at the initial stage of the design process. This study
also provides design guidelines for an optimal dynamic damper system using a CAE (computer aided engineering) analysis. The
damper FE (finite element) model is added to the vehicle model to analyze the relation between the frequency and the sensitivity
of the steering column system. This analysis methodology makes it possible to achieve target performance in the early design
stage and reduction of damper tuning activity after the proto car test stage. Through the proposed steering column system
development process, a lightweight vehicle with high stiffness is possible prior to the proto build stage. Furthermore, the
improved process is expected to contribute to reducing the overall development period and the number of proto car tests necessary
to achieve the desired steering system performance. 相似文献
33.
This paper presents a steering control method for lane-following in a vehicle using an image sensor. With each image frame
acquired from the sensor, the steering control method determines target position and direction, and constructs a travel path
from the current position to the target position either as an Arc-path or S-path. The steering angle is calculated from the
travel path thus generated, and the vehicle follows the travel path via motor-control. The method was tested using a vehicle
dubbed as KAV (Korea Autonomous Vehicle) along an expressway (Seoul Inner Beltway) trajectory with a variety of radii (50
m ∼ 300 m) while traveling at a speed of 60 km/h to 80 km/h. Compared with an experienced human driver, the method showed
little much difference in performance in terms of lane-center deviation. The proposed method is currently employed for high
speed autonomous driving as well as for stop and go traffic. 相似文献
34.
汽车转向力是汽车操纵稳定性评价中的重要指标,转向力的力矩波动直接影响着驾驶感受,合理的相位角设计能够有效地减少力矩波动。本文阐述了转向系统力矩波动原理,并运用该方法进行了某车型转向系统的优化设计。 相似文献
35.
针对某车型怠速工况下转向盘抖动问题,对整车进行了怠速振动试验并对转向盘进行了模态试验,确认转向盘系统与仪表板横梁及横梁与车身连接处的连接刚度不足导致整个转向系统模态下降,从而引起了共振。针对该问题建立了转向系统有限元模型,并根据模态试验结果对模型进行了验证。在该模型基础上对上述连接刚度进行了优化,对优化方案进行试验验证的结果表明该方案有效。 相似文献
36.
开发了一种工程机械专用车辆,驱动型式为6×6,全轮转向。其2、3桥采用同步液压转向,且配有转向锁止机构。理论上,转向锁止拉杆被固定后,车辆在水平路面上行驶时各点相对静止,但实际路面总有凸凹之处,会引起超静定问题的发生,从而加剧了轮胎的磨损。为了延长轮胎的使用寿命,初步确定将轮胎与地面间的附加滑移量限制在0.2mm以内。探讨了各推力杆作上下平移或者左右移动时,驱动轴在跳动过程中这些因素对轮胎产生附加摆角的影响程度。优化结果表明,即使跳动量达到100mm,轮胎与地面的最大附加滑移量也仅为0.105mm,达到了预期的优化目标。 相似文献
37.
38.
39.
为了优化转向梯形结构,文章根据阿克曼原理,在整体式转向梯形机构中,建立了以外侧车轮的实际与理论转角的偏差最小,为目标函数的优化数学模型。应用MATLAB软件编程仿真分析了转向梯形底角和梯形臂长度对目标函数的影响,仿真结果表明:梯形底角对转向性能的影响,比转向梯形臂的长度对转向性能的影响显著。通过实例介绍了一种没有加入权重函数,而是根据计算数据和图形曲线,直接找到汽车常用转角范围的最优解的设计方法。最后运用MATLAB软件完成了转向梯形机构的优化。该方法对如何在制造和装配过程中尽量减小梯形底角的各种误差具有借鉴作用。 相似文献
40.