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Using inertial measurement units originally developed for biomechanics for modal testing of civil engineering structures

机译：使用最初为生物力学开发的惯性测量单元，对土木工程结构进行模态测试

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摘要

This paper explores the use of wireless Inertial Measurement Units (IMU) originally developed for bio-mechanical research applications for modal testing of civil engineering infrastructure. Due to their biomechanics origin, these devices combine a triaxial accelerometer with gyroscopes and magnetometers for orientation, as well as on board data logging capability and wireless communication for optional data streaming and to coordinate synchronisation with other IMUs in a network. The motivation for application to civil structures is that their capabilities and simple operating procedures make them suitable for modal testing of many types of civil infrastructure of limited dimension including footbridges and floors while also enabling recovering of dynamic forces generated and applied to structures by moving humans. To explore their capabilities in civil applications, the IMUs are evaluated through modal tests on three different structures with increasing challenge of spatial and environmental complexity. These are, a full-scale floor mock-up in a laboratory, a short span road bridge and a seven story office tower. For each case, the results from the IMUs are compared with those from a conventional wired system to identify the limitations. The main conclusion is that the relatively high noise floor and limited communication range will not be a serious limitation in the great majority of typical civil modal test applications where convenient operation is a significant advantage over conventional wired systems.
机译：本文探讨了最初为生物力学研究应用而开发的无线惯性测量单元（IMU）在土木工程基础设施模态测试中的应用。由于其生物力学起源，这些设备将三轴加速度计与陀螺仪和磁力计结合在一起以进行定向，并具有板载数据记录功能和无线通信功能以进行可选的数据流传输并协调与网络中其他IMU的同步。应用于民用建筑的动机在于它们的功能和简单的操作程序使其适合于对多种类型的有限尺寸的民用基础设施（包括人行天桥和地板）进行模态测试，同时还可以使人移动产生的动力恢复并施加到建筑物上。为了探索其在民用领域的能力，通过对三种不同结构的模态测试对IMU进行评估，以应对日益复杂的空间和环境复杂性。这些是实验室中的完整地板模型，短跨度的公路桥梁和七层办公大楼。对于每种情况，将IMU的结果与常规有线系统的结果进行比较，以确定局限性。主要结论是，在大多数典型的民用模态测试应用中，相对较高的本底噪声和有限的通信范围不会成为严重的限制，在这些应用中，便捷的操作是优于常规有线系统的显着优势。

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