建立了某轻型客车车身、车架整体结构的有限元模型，计算了车身、车架整体结构和单独车架结构的振动模态,计算结果经过试验验证，表明所建立的有限元模型能够很好的反映原结构的振动特性。建立了车内空腔有限元模型，分析了车内空腔第一阶纵向模态。综合比较分析了车身、车架和空腔模态。

In this paper, the finite element model of body included frame of a light bus is established. The vibration modality of body included frame and frame alone are evaluated. The computed results are compared with tests. It shows that the model has represented the vibration characteristics of the original structure. The finite element model for the cavity acoustics is established. The first step modality in the longitudinal direction of the cavity acoustics is evaluated. All of the modalities include body, frame and cavity acoustics are analyzed and compared.