Abstract: Because of the complexity of the structure and numerous members, the technology of the full-monocoque coach manufacture has not been sufficiently developed in our country. To expedite the research and development of the full-monocoque, a dynamic stress testing for the full-monocoque coach is carried out under different road conditions. The dynamic stress data in the left side wall of the coach is collected. The method of loading spectrum measurement of the full-monocoque frame is studied, and the stress frequency of the measured data is analyzed. The loading spectrum data for different road conditions is obtained. The dynamic stress level and its variation of the left-side wall of the full-monocoque frame under the conditions of bending, torsion, tension and compression are studied. This study may provide a technical base for the full-monocoque coach’s design, simulation and testing.

Key words: vibration and wave, full-monocoque, dynamic stress measure, left side wall, loading spectrum, stress frequency analysis

摘要： 全承载式骨架构件结构复杂，杆件众多，目前国内全承载技术并不十分成熟。为加快其研发步伐，以某全承载式大客车为研究对象，在几种不同路况下作动态应力测试，提取大客车骨架左侧围动态应力数据。研究全承载式骨架载荷谱的测试方法，并对实测数据作载荷谱的应力频次分析，得到多种路面的载荷谱数据。研究骨架左侧围在动态运转下受弯、受扭、受拉、受压的应力大小和变化规律，为全承载式客车骨架的设计、仿真与试验提供技术基础。

关键词: 振动与波, 全承载, 动态应力测试, 左侧围, 载荷谱, 应力频次分析