Research On Virbration And Noise Control Of Panel Based On Two-Dimensional Acoustic Black Hole Structure

The physiological and psychological harm caused by vibration and noise has been paid much attention in various fields.Acoustic Black Hole(ABH)can control the curved waves in the structure,gather the vibration energy to the center of ABH without reflection,so that the structure can achieve the purpose of vibration and noise reduction.During the processing of acoustic black hole structure,the edge will be truncated,which destroys the zero-reflection characteristic of the structure edge,that is,the ideal acoustic black hole structure cannot be applied in engineering.By properly designing the Nonideal Acoustic Black Hole(NABH)structure at the edge,and sticking a small amount of damping material,the structure is designed to reduce structural vibration and radiation noise while achieving lightweight structure design.In this paper,basic theoretical analysis,numerical simulation and bench test are combined to solve the problem of panel vibration and noise control based on Nonideal two-dimensional Acoustic Black Hole(NTDABH)characteristic research,which mainly includes the following aspects:(1)Based on geometric acoustic method and analytical method,the motion trajectory of curved waves in NTDABH structure is analyzed from the theoretical level,so as to reveal the energy aggregation effect characteristics of NTDABH structure and the influence of damping layer on vibration and noise reduction of structure.(2)the finite element and boundary element simulation analysis model embedded in NTDABH structure plate is established.Based on the numerical method,the dynamic and acoustic characteristics of five NTDABH structures,ideal ABH structures and ordinary plates are compared from the four aspects of mode,frequency response,vibration power flow and radiated noise,and the influence of NTDABH on the vibration and noise reduction of structures is analyzed.(3)The finite element model and boundary element model are modified by changing the thickness,power law and array of NTDABH structure.By comparing the simulation results,the influence law of the three factors on the performance of NTDABH is analyzed and studied to guide the design of NTDABH structure in engineering applications.(4)Design embedded NTDABH diaphragm pump floor optimization scheme,establish simulation analysis model,analyze and determine the appropriate floor optimization scheme and processing samples,build diaphragm pump test bench,verify the feasibility and correctness of the optimization scheme.In this paper,non-ideal two-dimensional acoustic black holes with different edge characteristics are designed,the energy aggregation effect of NTDABH structure is analyzed,and the effects of different factors on the performance of NTDABH are discussed.