Detection and Assessment of Wood Decay Using Guided Waves and Nonlinear Acoustics

尽管在保护木材和木材复合材料方面已经做了很多工作，但木结构，如建筑物、木桥、电线杆和其他木结构仍在继续腐烂，这主要是因为即使是当今最好的防腐技术也无法真正保护这些材料免受自然腐烂的影响。每天发生的数百万美元的木材房地产交易没有经过腐烂检查，美国大约有2000万个木制电线杆说明了木材腐烂的经济影响。本研究提出了使用非线性导波超声方法检测和评估木材腐烂的方法。以下两个问题将作为本研究的重点和示范项目：(1)公用木杆的衰减检测与评估；(2)胶合木梁的衰减检测与评估。选择这两个问题是因为它们的复杂性，它们的经济影响，并且因为它们代表了各种各样的木制品。

Whereas much has been done to preserve wood and wood composites, wood structures such as buildings, wood bridges, utility poles, and others continue to decay mainly because even the best preservative techniques available today have not been able to truly preserve these materials against the natural process of decay. The million of dollars in wood real estate transactions that occur daily without being inspected for decay and the approximately 20 million wooden utility poles in the United States illustrate the economic impact of wood decay. This proposed research addresses the detection and assessment of wood decay using a non-linear guided wave ultrasonic approach. The following two problems will serve as the focal points for this research and as demonstration projects: (1) detection and assessment of decay in utility wooden poles, and (2) detection and assessment of decay in glulam beams. These two problems have been selected because of their complexity, their economic impact, and because they represent a wide variety of wood products.