Application And Analysis Of Shock-absorbing And Noise-reducing Performance Of The Isolation Cushion In Noise Elimination Structure

Anechoic chamber is a kind of common acoustic laboratory,which usually adopts the house-in-house structural style to eliminate the noise and installs an seismic isolation pad to improve the seismic isolation performance.The mental spring isolation device is usually one of the optimum schemes of isolation cushion design because of its good vibration isolation effect.Combined with the discussion of the development of anti-seismic design and seismic isolation design methods,the essay analyzes the achievements and experience of the two design applied in anechoic chambers and mainly adopts five bearing arrangement precepts to compare and analyze on the basis of considering the quantity and the position of isolation cushion.The following are specific research content and results.(1)The paper sketches the development of erasure room structure,and analyzes the principle and approach of shocking absorption and reducing noise in building.(2)Aiming at two different bearing arrangements:fixed bearings and isolation cushion bearings,this paper applies the SAP2000 finite element software to analyze how sound wave responds in the structure and gain the dynamic curve.(3)By inputting different earthquake waves,the paper explains how interlayer shear force,interlayer bending moment,top displacement and top acceleration act.The results show that the position of the isolation cushion have an important influence for the seismic performance of the structure.Generally speaking,putting the isolation cushion properly,it can reduce the shearing force and bending moment obviously,even keep the displacement within the scope.(4)By comparing and optimizing three precepts,the paper analyzes the influences on structural dynamic characteristics when adopting different isolation cushion arrangement so as to make a best precept under the combined action of seismic loads and acoustic loads.(5)Only from the perspective of the two schemes:completely using the fixed bearings or completely using metal spring vibration isolator,the latter has a better performance of noise reduction and vibration reduction,and it also states that the isolation cushion has a bright future in anechoic chamber structure.(6)The object of this paper is to adopt the way of joint layout of the fixed bearings and the isolation cushion to achieve the effects of the isolation and noise reduction.The results of numerical calculation model obtained by SAP2000 finite element analysis can meet the requirements of "anechoic chamber and semi anechoic chamber technical specifications".From the point of view of numerical simulation analysis,the program has a certain economic and social benefits on account that it can not only cut down the unnecessary cost of isolation cushion,but also reduce the cost of uniform unloading construction measures of house-in-house structure.