这个问题特别好;希望下面这个文章对你有帮助
你说的没错,这个东西用“反射”和“波导”观点分析,都是不合适的
“传播”反映了射线声学的观点,在这里不适用
“传”为transmission,在一定距离上才有意义,而如楼上说的,箱体相对波长极短
“播”为radiation,在近似开放空间才有意义,箱体自然是封闭的啊
腔体内空间太小,短时间内声波反射多次,
箱体形状稍有不同,在两次反射后的情况全不一致,用“微观”方法看,马上就糊涂了
实际上,箱体内的声波分析,用房间声学的统计和模态观点看,更容易懂
把后腔处理成封闭箱体内的空气,着力分析它的模态就好了
Acoustic Wave Action Inside Rectangular
Loudspeaker Cabinets*
JEONG-GUON IH
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon, Korea
The acoustic interaction between the box and the driving surfaces inside a loudspeaker
cabinet is analyzed as a piston-driven rectangular enclosure with rigid walls. Ail the
geometric parameters of the system are chosen arbitrarily for a generalization of the
derived formulas. Using the results of the present study, the locations of the loudspeakers
and vents can be optimized very easily without the use of sound-absorbing materials.
J.AudioEng.Soc.,Vol.39,No.12,1991 December
http://u.115.com/file/f578c42224
(这个连接在30天内有效)
举个建声的图片作为例子
此主题相关图片如下:一次反射.jpg
此主题相关图片如下:二次反射声线.jpg
[此贴子已经被作者于2010-02-21 15:14:15编辑过]