汽车工程 ›› 2022, Vol. 44 ›› Issue (12): 1936-1943.doi: 10.19562/j.chinasae.qcgc.2022.12.015

所属专题: 底盘&动力学&整车性能专题2022年

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基于体压分布的汽车座椅振动舒适性评价

高开展,罗巧,张志飞(),徐中明   

  1. 重庆大学机械与运载工程学院,重庆 400030
  • 收稿日期:2022-06-28 修回日期:2022-08-09 出版日期:2022-12-25 发布日期:2022-12-22
  • 通讯作者: 张志飞 E-mail:z.zhang@cqu.edu.cn
  • 基金资助:
    国家自然科学基金(51875060)

Vibration Comfort Evaluation of Vehicle Seat Based on Body Pressure Distribution

Kaizhan Gao,Qiao Luo,Zhifei Zhang(),Zhongming Xu   

  1. School of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400030
  • Received:2022-06-28 Revised:2022-08-09 Online:2022-12-25 Published:2022-12-22
  • Contact: Zhifei Zhang E-mail:z.zhang@cqu.edu.cn

摘要:

为采用人-椅接触面的体压分布来表征汽车座椅的振动舒适性,在6种不同幅值的低频垂向激励下,以12名受试者为对象,进行汽车座椅振动舒适性主客观试验,以获得体压分布指标。对振动加速度和体压分布的测试结果进行分析,以提取加权加速度均方根值、平均压力均值、最大压力均值和平均压力变化率与法向力变化率的均方根值等客观评价指标。运用非参数统计方法对主客观指标进行相关分析,结果表明,平均压力均值、最大压力均值与主观不舒适性评分的相关性较弱(β=0.26, 0.10),而平均压力变化率和法向力变化率的均方根值与主观不舒适性评分具有较强的相关性(β=0.83, 0.85)。最后利用史蒂文斯幂定律对主客观参量进行关联性分析,结果表明,与加权加速度均方根值指标相比,平均压力变化率和法向力变化率的均方根值与主观不舒适性评分均具有较高的关联性(R2> 99.0%),可作为体压分布评价指标来表征汽车座椅的振动舒适性。

关键词: 汽车座椅, 振动舒适性, 主观评价, 客观测试, 体压分布

Abstract:

For using the body pressure distribution on the human-seat contact surface to characterize the vibration comfort of vehicle seat, the subjective and objective test of seat vibration comfort are conducted with 12 test participants under low-frequency vertical excitation with six different magnitudes to find the body pressure distribution indicator. The test results of vibration acceleration and body pressure distribution are analyzed to extract the objective evaluation indicators, including the root-mean-square (RMS) of weighted acceleration, the means of average pressure and maximum pressure, and the RMSs of average pressure changing rate and normal force changing rate. A correlation analysis is carried out on subjective and objective indicators by applying non-parametric statistics method. The results show that the means of average pressure and maximum pressure have rather weak correlation with subjective discomfort score (β=0.26, 0.10 respectively), while the RMSs of average pressure changing rate and normal force changing rate have strong correlation with subjective discomfort score (β=0.83, 0.85 respectively). Finally, the relationship between the objective parameters and subjective discomfort rating is analyzed by using Stevens’ power law. The results indicate that compare with the RMS indicator of weighted acceleration, the RMSs of both average pressure changing rate and normal force changing rate are highly correlated (R2 >99.0%) with subjective discomfort score, hence can be taken as body pressure distribution indicators to characterize vibration comfort.

Key words: vehicle seat, vibration comfort, subjective evaluation, objective test, body pressure distribution