This study analyzed whole-body vibration (WBV) on a car seat (seat surface and feet) in passenger cars as a function of longitudinal road roughness. Measurements were provided on nine different cars in six categories and included a total travel distance of 1,860 km. The root mean square (RMS) of the frequency-weighted acceleration was used to quantify WBV. The relationship between seat acceleration response and comfort reactions according to the ISO 2631-1 and the International Roughness Index (IRI) was estimated. IRI thresholds were proposed as a function of vehicle speed and road category. Proposed IRI thresholds decreased with vehicle velocity and were similar with published IRI threshold proposals based on simulation. IRI thresholds as a function of speed limit should decrease with power by approximately –0.75. Substantially lower (by ~ 40%) IRI thresholds were calculated for the total vibration value (six signals) in comparison with vertical vibration on the seat surface.

这项研究分析了乘用车的汽车座椅（座椅表面和脚）的全身振动（WBV）与纵向道路不平度的关系。对六类九种不同的汽车进行了测量，包括总行驶距离1,860公里。频率加权加速度的均方根（RMS）用于量化WBV。估算了根据ISO 2631-1和国际粗糙度指数（IRI）得出的座椅加速响应和舒适感之间的关系。提出了IRI阈值作为车速和道路类别的函数。提议的IRI阈值随车速降低，并且与基于模拟的已发布IRI阈值提议相似。作为速度限制的函数的IRI阈值应随功率降低约–0.75。