CAJ | 학술논문

基于三维声波波动方程的有限元软件LMS Virtual．lab Acoustics，采用两种不同的研究方法获得了消声器的传递损失，第1种方法是采用定义入口单位质点振速的方法；第2种方法是采用AML（ Automatically Matched Layer ）技术直接计算声功率的方法．结果表明两种方法计算出来的结果高度一致，且第2种方法计算步骤简单、计算速度快，对于大截面管路消声器也同样适用．相对传统的传递矩阵法和依靠经验的方法，用三维声学有限元法，在计算速度上有很大的提高，并且有效地减少了基于一维平面波理论所产生的消声器传递损失计算误差．最后利用第2种方法，研究了基于气流速度影响的消声器出口辐射噪声，并建立了其插入损失的有限元计算模型．
기우삼유성파파동방정적유한원연건LMS Virtual．lab Acoustics，채용량충불동적연구방법획득료소성기적전체손실，제1충방법시채용정의입구단위질점진속적방법；제2충방법시채용AML（ Automatically Matched Layer ）기술직접계산성공솔적방법．결과표명량충방법계산출래적결과고도일치，차제2충방법계산보취간단、계산속도쾌，대우대절면관로소성기야동양괄용．상대전통적전체구진법화의고경험적방법，용삼유성학유한원법，재계산속도상유흔대적제고，병차유효지감소료기우일유평면파이론소산생적소성기전체손실계산오차．최후이용제2충방법，연구료기우기류속도영향적소성기출구복사조성，병건립료기삽입손실적유한원계산모형．
This paper presents two different methods for the study of transmission loss of mufflers based on three-dimensional acoustic wave equation using the finite element software LMS .Virtual Lab Acoustics .The first method used defined unit velocity of particle vibration on the inlet; another method used technology of AML to calculate sound power .The results show that the calculation results of the two methods are highly consistent .The second method has simpler calculation steps and faster calculation speed and it is suitable for the large cross -sec-tion duct muffler;Compared with the traditional transfer matrix method and the empirical method ,the calculation speed has been improved by using the three-dimension acoustic finite element method , and the transfer error of muffler based on one-dimensional plane waves has been effectively reduced .Finally, the radiation noise of muf-fler outlet was studied in the second method based on the effect of flow velocity , and the finite element calcula-tion model of insertion loss was also established .