Research on fatigue diagnosis of structures using the polarization fatigue characteristics of piezoelectric materials

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04703
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Sato Hiroshi 国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 主任研究員 (70344166)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 圧電 / 分極反転疲労 / エナジーハーベスト

Outline of Final Research Achievements

To apply a remaining life judgment device to mechanical components, a test was conducted to detect the output of the driving piezoelectric element using a thrust-type rolling test machine. Since it was difficult to directly install the driving piezoelectric element on mechanical components such as ball bearings, a piezoelectric material for driving was attached around the test machine. However, the signal output was extremely weak for polarizing the recording sensor, necessitating a redesign of the remaining life judgment sensor itself . Additionally, due to extremely high noise, it was difficult to record accurate vibration histories, so a passive filter was added between the driving piezoelectric element and the recording sensor.

Free Research Field

センサ、アクチュエータ、エナジーハーベスト

Academic Significance and Societal Importance of the Research Achievements

強誘電性薄膜の厚み、センササイズ、分極電圧、分極周波数等の様々なパラメータを変化させた場合の残留分極の疲労状況を評価し、データマップの作成を行った。このデータマップを利用することにより、強誘電体薄膜センサの分極反転疲労状況から、構造体にこれまで加わった振動履歴を同定することができ、算出した振動履歴から、構造体の余寿命を判断することが可能となる。