In this study, the effect of phase shift under multiaxial excitation on fatigue damage was investigated for the roof components of electrical driven bus. The experiments were performed using a servo-hydraulic controlled multiaxial shaker. Firstly, phase degree and concurrence of servo-hydraulic actuators were calculated and compared for in-phase and out-of-phase loading cases. Following response signals of both loadings were acquired to investigate the dynamic response of the structure and roof components. Both test loadings were compared by level crossing counting and damage calculations in the frequency domain. The results indicate that the out-of-phase loading can reduce the acceleration and strain values on the flaps induced damage significantly compared to in-phase loading. Furthermore, the out-of-phase loading of bench testing corresponds well to the experimental results of rough road, which represent customer drive conditions.

在这项研究中，研究了多轴激励下相移对电动巴士车顶部件疲劳损伤的影响。使用伺服液压控制的多轴振动器进行实验。首先，计算并比较了同相和异相加载情况下伺服液压执行器的相位度和并发度。获取以下两种载荷的响应信号，以研究结构和屋顶组件的动态响应。通过在频域中的水平交叉计数和损伤计算来比较两种测试载荷。结果表明，与同相加载相比，异相加载可以显着降低襟翼上的加速度和应变值。此外，