Gao Huidong, Rose Joseph L
Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA, USA.
IEEE Trans Ultrason Ferroelectr Freq Control. 2009 Feb;56(2):334-44. doi: 10.1109/TUFFC.2009.1042.
Ice accumulation on airfoils has been identified as a primary cause of many accidents in commercial and military aircraft. To improve aviation safety as well as reduce cost and environmental threats related to aircraft icing, sensitive, reliable, and aerodynamically compatible ice detection techniques are in great demand. Ultrasonic guided-wave-based techniques have been proved reliable for "go" and "no go" types of ice detection in some systems including the HALO system, in which the second author of this paper is a primary contributor. In this paper, we propose a new model that takes the ice layer into guided-wave modeling. Using this model, the thickness and type of ice formation can be determined from guided-wave signals. Five experimental schemes are also proposed in this paper based on some unique features identified from the guided- wave dispersion curves. A sample experiment is also presented in this paper, where a 1 mm thick glaze ice on a 2 mm aluminum plate is clearly detected. Quantitative match of the experiment data to theoretical prediction serves as a strong support for future implementation of other testing schemes proposed in this paper.
机翼上的结冰已被确认为商用和军用飞机许多事故的主要原因。为了提高航空安全性，同时降低与飞机结冰相关的成本和环境威胁，对灵敏、可靠且与空气动力学兼容的结冰检测技术有巨大需求。基于超声导波的技术已被证明在包括HALO系统在内的一些系统中，对于“有冰”和“无冰”类型的结冰检测是可靠的，本文第二作者是该系统的主要贡献者之一。在本文中，我们提出了一种将冰层纳入导波建模的新模型。利用该模型，可以从导波信号确定冰层的厚度和结冰类型。基于从导波频散曲线中识别出的一些独特特征，本文还提出了五种实验方案。本文还给出了一个示例实验，其中在一块2毫米厚的铝板上清晰检测到了1毫米厚的 glaze 冰。实验数据与理论预测的定量匹配为本文提出的其他测试方案的未来实施提供了有力支持。
