A Study of Bolt Conclusion Evaluation System Using Non-linear Ultrasonic Waves

2015 Fiscal Year Final Research Report

• Project/Area Number: 25820170
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Measurement engineering
• Research Institution: Akita University
• Principal Investigator: Fukuda Makoto 秋田大学, 工学(系)研究科(研究院), 講師 (50507671)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 非線形超音波 / ボルト / ナット / 軸力 / 2次高調波 / 有限要素法 / 反射係数 / 圧電振動子

Outline of Final Research Achievements

To use second harmonic ultrasonic waves for bolt conclusion evaluation, the relation between the contact area (length) of bolt-nut surfaces that are generated second harmonic waves because of CAN (Contact Acoustic Non-linearity) and wave length of ultrasonic waves was confirmed using FEM simulation and several experiments. Therefore, location for detecting second harmonic waves or applicable bolt length and diameter were also influenced. Moreover, in practice, seal or adhesive are used, whose characteristics for ultrasonic transmission or absorption will be required to evaluate bolt conclusions.

Free Research Field

超音波工学