Lamb wave is widely recognized as one of the most encouraging tools for structural health monitoring (SHM) systems. In spite of many favourable characteristics of Lamb wave for SHM, real-world application of these systems is still quite limited. Beside the complexities derived from multi-modal, dispersive and multi-path characteristics of Lamb waves, one of the main challenges in Lamb wave based SHM is sensitivity of these systems to environmental and operational conditions (EOCs) parameters. This paper provides a state of the art review of the effects of EOCs parameters including: temperature, moisture, load, vibration and bonding (adhesive layer shear modulus and thickness, bond defects), on Lamb wave propagation. Moreover, this paper provides a summary of compensation strategies to account for EOCs effects as well as baseline free techniques. An objective is also to understand the future directions and areas requiring attention of the researchers.

中文翻译：

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环境和运行条件对基于 Lamb 波的结构健康监测系统的影响：综述

兰姆波被广泛认为是结构健康监测 (SHM) 系统最令人鼓舞的工具之一。尽管兰姆波对于 SHM 具有许多有利特性，但这些系统的实际应用仍然非常有限。除了源自兰姆波的多模态、色散和多路径特性的复杂性之外，基于兰姆波的 SHM 的主要挑战之一是这些系统对环境和操作条件 (EOC) 参数的敏感性。本文提供了 EOC 参数对兰姆波传播的影响的最新技术回顾，这些参数包括：温度、湿度、载荷、振动和粘合（粘合剂层剪切模量和厚度、粘合缺陷）。此外，本文提供了补偿策略的摘要，以说明 EOC 的影响以及无基线技术。