The basic principle and characteristics of the typical methods are discussed, which involve wave energy dissipation, time reversal guided wave, contact acoustic nonlinearity, and active chaotic ultrasonic excitation-based methods. This chapter presents a review of the existing studies on bolt preload monitoring method based on guided wave.
In the past decades, the guided wave-based structural health monitoring (SHM) methods have been developed for the detection of bolt loosening, and considerable advancements have been made in this area. Reliable detection of bolt loosening is significant to ensure structural reliability and safety. However, in practical applications, preload loss in pre-tensioned bolts is inevitable.
Significant advantages of bolted joints are that they can be easily disassembled and the possibility to design for bearing large working load. Bolted joints are widely applied in engineering structures.
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