To study the coupled vibration of the seated human body in the sagittal plane and coronal plane exposed to lateral, vertical and roll excitations, a seated human body model consisting of abdomen, pelvis, two thighs, upper torso (including the shoulders, thorax, arms), and head (including neck) was proposed. The model was calibrated with the apparent masses measured in 0.5–20 Hz and proved to be applicable for subjects of different weights and heights and different excitation magnitudes in combined lateral, vertical and roll directions. This model was also potentially suitable for different backrest inclinations. Three modes of the human body associated with the resonances in the measured apparent masses were observed by means of modal analysis. The first and second modes with modal frequencies of 1.16 and 2.53 Hz, respectively, featured the vibration of the human body in the coronal plane. The former was dominated by the lateral and roll vibrations of the upper torso and head, while the latter by the lateral whole-body vibration accompanied by roll of the upper torso and head. The third mode with a modal frequency of 5.28 Hz featured the vibration of the human body in the sagittal plane. This mode exhibited a combination of the vertical vibration of the entire body and a bending motion of the upper body arising from the pitch of pelvis. These three modes showed good consistency with those identified in the modal test. The vibration coupling between the sagittal plane and coronal plane associated with these three modes was not significant. This model can be used to calculate the ride vibration and comfort of passengers in rail vehicles.

研究坐姿人体在矢状面和冠状面在横向、垂直和侧倾激发下的耦合振动，由腹部、骨盆、两条大腿、上半身（包括肩部、胸部、手臂）组成的坐姿人体模型），并提出了头部（包括颈部）。该模型使用 0.5-20 Hz 测量的表观质量进行校准，并被证明适用于不同重量和高度以及在横向、垂直和滚动方向上组合的不同激励幅度的对象。该模型还可能适用于不同的靠背倾斜度。通过模态分析观察到与测量的表观质量中的共振相关的人体的三种模式。模态频率分别为 1.16 和 2.53 Hz 的第一和第二模态，以人体在冠状面的振动为特征。前者以上部躯干和头部的横向和侧倾振动为主，而后者则以伴随上部躯干和头部侧倾的全身横向振动为主。模态频率为 5.28 Hz 的第三个模式以人体在矢状面的振动为特征。这种模式表现出整个身体的垂直振动和骨盆倾斜引起的上半身弯曲运动的组合。这三种模式与模态测试中确定的模式显示出良好的一致性。与这三种模式相关的矢状面和冠状面之间的振动耦合不显着。该模型可用于计算轨道车辆乘客的乘坐振动和舒适度。