宽频带全身振动评价方法的探讨

THE INQUIRY ON EVALUATION METHOD OF BROAD-BAND WHOLE-BODY VIBRATION

使用B＆K振动测量仪器,对29辆次机动车辆的振动进行了测量、记录和分析。结果表明,机动车辆的振动是宽频带振动。按ISO2631/1推荐的全频域计权加速度评价宽频带振动可产生较大误差,为此应对ISO2631/1给出的限值作出适当调整。本文统计了29辆次机动车辆87个轴向全频域计权加速度级与对应轴向最大一个1/3倍频程带计权加速度级的差值,求出平均值作为调整值。该值加在相应轴向最敏感频带的限值上,其和即为全身振动的全频域计权加速度的评价限值。

The vibration levels of 29 vehicles were measured, recorded and analysed by B&K vibration measuring instruments.The results showed that the vehicles vibration was broad-band vibration.It may have greater error to use the over-all weighted acceleration recommeded in ISO 2631/1 for evaluating broad-band vibration .Therefore .appropriate .adjustment of guidance limit values given in ISO 2631/1 may have to be considered.Ths paper takes a statistical difference of a axis over-all weighted acceleration and the greatest single third octave band weighted acceleration on 87 axes in 29 vehicles.the average difference is an adjustment value.The adjustment value is addedon the most sensitive frequency limits corresponding, axis, then, this sum may be taken as evaluation limit of over-all weighted acceleration of whole-body vibration.