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LDV Measurement of Local Nonlinear Contact Conditions of Flange Joint

机译：LDV测量法兰接头的局部非线性接触条件

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The traditional approach to evaluating the linear dynamic behavior of structures for modal validation is based on the acquisition of frequency response functions and their modal analysis. With small modifications, a similar technique can be used to validate nonlinear response predictions. The use of nonlinear dynamic analysis of flange joints for sealing and wear predictions makes it necessary to also provide validation information for the localised nonlinear mechanisms at the contact surface. For this purpose, a technique based on two Laser Doppler Vibrometers has been developed. The experimental set-up can provide data of the relative out-of-plane displacement of the bolted flange joint during a vibration cycle, which indicates contact separation and permanent gap locations. The observed influence of different excitation levels and bolt torques on the global and local dynamic response led to an understanding of the nonlinear behaviour of the flange and of the local contact conditions.
机译：评估模态验证结构线性动态行为的传统方法是基于获取频率响应函数及其模态分析。通过微小修改，可以使用类似的技术来验证非线性响应预测。使用非线性动力分析的凸缘接头进行密封和磨损预测使得有必要提供用于在接触表面处的局部非线性机制的验证信息。为此，已经开发了一种基于两个激光多普勒振动器的技术。实验装置可以在振动循环期间提供螺栓凸缘接头的相对外平面位移的数据，这表示接触分离和永久间隙位置。观察到不同励磁水平和螺栓扭矩对全局和局部动态响应的影响导致了对法兰的非线性行为和局部接触条件的理解。

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