Acoustic metamaterial Structure for Potential Health Monitoring

摘要

The focus of this paper will be on the challenges and opportunities posed by use of wave active sensors for structural health monitoring of metamaterial as different from that of the metallic structures. Metamaterial exhibits application prospects in vibration control, wave manipulation and noise reduction due to their unique dynamic properties. Metamaterial has great potential in structural health monitoring and non-destructive testing. This paper presents modeling, analysis techniques and experiment of for Acoustic metamaterial Structure for knowing waves. For a unit cell of an infinite Acoustic metamaterial Structure, governing equations are derived using the extended Hamilton principle. The concepts of negative effective mass and how the spring-mass-damper subsystems create a stopband are explained in detail. Numerical simulations reveal that the actual working mechanism of the proposed acoustic metamaterial structure is based on the concept of conventional mechanical vibration absorbers. It uses the incoming wave in the structure to resonate the integrated mass-damper absorbers to vibrate in their optical mode at frequencies close to but above their local resonance frequencies to create shear forces and bending moments to straighten the panel and stop the wave propagation. And the stopband signal shows the structure characteristic. Moreover, It shows that metamaterial can be use in health monitoring and non-destructive testing.