Development and experimental validation of smartphone-based tools to assess mechanical tension forces in guy wires of transmission towers

钢塔是魁北克水电庞大输电网络的重要组成部分。为了保证输电钢架杆塔的安全运行和良好的结构性能，必须定期对架空输电钢塔拉索内的拉力进行验算。这项研究项目的主要目标是开发并实验验证一种快速、可靠和严格的技术，以使用智能手机测量Guy导线内的张力。最有希望的可用于评估拉索内张力的方法将被确定并应用于拉索式格构塔的实际案例研究。建立索式格构塔的有限元模型，进行动力分析，评估影响钢丝绳张力的关键参数。根据操作系统(OS)和编程环境，将选择两种类型的智能手机。它们将被用来实现基于测量的加速度数据估计振动拉力的解析公式。在实验室中测试的拉力将被评估。智能手机将使用专门为此目的设计的紧固件连接到Guy电线上。三轴加速度计和智能手机记录的盖伊电线自由振动时的加速度时间历程将进行比较，以评估智能手机内置加速度计的准确性和潜在局限性。开发的智能手机应用程序将用于提取频率数据，并预测测试的Guy导线内由执行器控制的张力。选定索塔的拉索拉力将使用编程的智能手机进行现场评估，并根据称重传感器的测量结果进行验证。将根据终端用户的需要编制和定制用户界面，以增强所开发的智能手机应用程序的有效和快速操作。拟议的基于振动的技术将被实施到魁北克水电的资产管理计划中。将提供一份用户手册，描述所开发的智能手机应用程序，并逐步说明其正确和有效地使用不同类别的盖伊电线。

Steel overhead towers are among the critical components of Hydro-Québec's extensive power transmission network. The tension within guy wires supporting power transmission steel lattice towers has to be regularly verified to ensure safe operation and adequate structural performance. The main objective of this research project is to develop and experimentally validate a quick, reliable and rigorous technique to measure the tension within guy wires using smartphones. Most promising available procedures for assessing tension forces within cables will be identified and applied to actual case studies of guyed lattice towers. Finite element models of guyed lattice towers will be built and used to perform dynamic analyses to evaluate the influence of most critical parameters contributing to wire tension force. Two types of smartphones will be selected depending on the operating systems (OS) and the programming environment. They will be used to implement analytical formulations for estimation of tension force in vibrating guy wires based on measured acceleration data. The tension force within guy wires tested in the laboratory will be assessed. The smartphone will be attached to the guy wire using a fastener designed specifically for this purpose. The acceleration time histories recorded by tri-axial accelerometers and smartphone during free vibration of the guy wires will be compared to assess the accuracy and potential limitations of the smartphone built-in accelerometers. The smartphone applications developed will be used to extract frequency data and predict actuator-controlled tension forces within the tested guy wires. The tension force in the guy wires of selected guyed towers will be assessed in-situ using the programmed smartphones and validated against load cell measures. User interfaces that enhance effective and quick operation of the developed smartphone applications will be programmed and tailored to the needs of end users. The proposed vibration-based technique will be implemented into Hydro-Québec's asset management programs. A user manual describing the smartphone application developed and a step-by-step illustration of its correct and effective use for different categories of guy wires will be provided.