振动的时效性对道路行驶舒适性评价的影响

Effect of Vibration Timeliness on Road Riding Quality Evaluation

摘要:

将每个振动时刻对应于评分时刻均有一个时滞的多对一情形转化为每个过程只有一个代表时滞与之对应的一对一情形，并检验和回归了代表时滞对主观评分的影响.在考虑时滞的基础上，使用分数阶微积分以考虑每个振动时刻之前的历史过程，选取预测主观评分精度最好的阶次为最优阶次.结果表明，较短的时滞不会影响评分结果，但较大的时滞能显著降低主观评分,使用结构行为学方程能较好地拟合两者的关系.对按频率加权的主轴加速度、旋转轴角速度分别取0.7、0.3阶积分可降低11.9%的预测误差，这反映人对振动的累积过程比较敏感.

关键词:道路行驶舒适性; 主观评分; 时滞; 历史过程

Abstract:

The many-to-one situation that each vibration moment corresponded to the scoring moment for a time lag was transformed to a one-to-one situation that each vibration process had only one representative time lag. The effect of the time lag on subjective scorings was tested and regressed. A fractional order calculus was then introduced to capture the effect of vibration history and the order that gave the best prediction precision for subjective scorings was chosen as the best order. Test results revealed that a short time lag does not influence the subjective scorings, while a longer time lag can have a significant effect. A structural behavior function was then adopted to arrive at a better description of the relationship between the time lags and the subjective scorings. If 0.7 and 0.3 order integration are used for the frequency weighted principle acceleration and angular velocity respectively, an 11.9% improvement can be achieved in the precision error. It reflects that humans are sensitive to cumulative vibration.

Key words:road riding quality; subjective scoring; time lag; historical process