Analysis Of Corner-Studded Structure Of The Corners Based On Acoustic Black Holes

High-frequency vibration will affect the normal work of mechanical equipment.Long-term use may cause key parts of the equipment.In addition,high-frequency noise will also affect the psychological and physiological health of the staff.For the starting point of this problem,researchers are looking for various effective new methods to improve and even replace traditional hindrance technology.At present,the sound of acoustic black holes has aroused widespread attention from researchers,but it is mainly concentrated on a single beam or plate,and the actual engineering structure is mostly a complex coupling structure with a certain angle of the beam or board.At present,the bending wave transmission mechanism of the sound-learning black hole structure has many research results.However,elastic waves will generate waveform conversion when the corner turning structure,especially in the high-frequency band vertical wave transformation to bending waves.Therefore,the transmission mechanism in the structure is equally important.If the stiffness and quality of the acoustic black hole structure changes the power index in the direction of the longitudinal wave,it will inevitably affect the transmission of the longitudinal wave.However,its precise transmission mechanism is not clear.After additional adhesive elastic materials,the elastic energy loss mechanism needs to be further proven.From the two aspects of frequency domain and time domain,the theoretical,numerical simulation and testing of non-perfect acoustics black holes in the coupling thin plate were conducted in the coupling thin plate.This article first analyzes the acoustic transmission rules of acoustic black holes and single-angle coupling boards,analyzes the energy aggregation mechanism of perfect acoustic black holes and the absorption effect of perfect sound-learning black holes after additional damping materials;The law provides a basis for the analysis of the combination of coupling of the additional acoustic acoustics.Based on theoretical guidance,this article simulates the single-rotating-angle coupling sheet of the additional non-perfect acoustic black hole.Compared with the uniform coupling panel in the embedded non-perfect acoustic black hole,the vibration acceleration at the high frequency phase is attenuation faster.A small amount of energy agglomeration is still found at the cut-off of the black hole,and adding the damping layer directly below the black hole makes the energy concentration more obvious.The energy density with an acoustic black hole coupling board with the quality of the vibration resistance will occur sharply at a high frequency.The reason is that the energy blocking quality can reflect part of the energy that can not be absorbed to the acoustic black hole area.Under different corners,whether it is a coupled panel of acoustic black holes or uniform coupling boards,its acceleration wave peak will be shifted,which shows that the corner is an important factor affecting the vibration absorption.It can be seen in the analysis of the energy distribution of the vibration system that no matter whether it is added or not,the embedded acoustic black hole coupling board makes the horizontal wave vibration energy transmitted to the downstream structure compared with the uniform board.In the area,as the frequency increases,the resistance capacity of damping the horizontal wave transmitted to the downstream structure has decreased;after additional vibration quality and damping on the coupling plate,the energy ratio of the horizontal wave energy transmitted to the downstream structure has been obtained.A good suppression,the role of the corner is the size of the peak that affects the energy ratio in some frequency domains.Finally,this article designed the test to verify the analysis results,and the results were consistent with the changes in the results of the numerical analysis,which verified the effectiveness of the simulation analysis in this article.