Concurrent generation and amplification of longitudinal and bending waves using defective phononic crystals

作     者：S.H.JO S.H.JO

作者机构：Department of MechanicalRoboticsand Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea 

出 版 物：《Applied Mathematics and Mechanics(English Edition)》 (应用数学和力学(英文版))

年 卷 期：2025年第46卷第2期

页      面：269-288页

核心收录：

学科分类：08[工学] 080101[工学-一般力学与力学基础] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education(No.2022R1I1A1A01056406) 

主　　题：phononic crystal(PnC) defect concurrent generation piezoelectric ultrasonic actuator 

摘      要：Defective phononic crystals(PnCs)have enabled spatial localization and quantitative amplification of elastic wave *** previous research has focused on applications such as narrow-bandpass filters,ultrasonic sensors,and piezoelectric energy harvesters,typically operating under the assumption of an external elastic wave ***,a novel approach that uses defective PnCs as ultrasonic actuators to generate amplified waves has ***,the existing studies are limited to the generation of either longitudinal or bending waves,with no research addressing the concurrent generation of ***,this paper proposes a straightforward methodology for the concurrent generation and amplification of both wave types utilizing defect modes at independent defect-band *** piezoelectric elements are attached to the defect,with each element connected to independent external voltage *** precisely adjusting the magnitude and temporal phase differences between the voltage sources,concurrently amplified wave generation is *** paper highlights the advantages of the proposed analytical *** model is both computationally time-efficient and accurate,in comparison with the COMSOL simulation *** instance,in case studies,the analytical model reduces the computational time from one hour to mere seconds,while maintaining acceptable error rates of 1%in peak *** concurrent wave-generation methodology opens new avenues for applications in rotating machinery fault diagnosis,structural health monitoring,and medical imaging.