|
发表于 19-6-2008 19:05:54
|
显示全部楼层
NAH, NPA
Nearfield Acoustical Holography technique can be helpful and it was pretty prevalent in the industrail area recently.What it is doing is this technique may synthesize the far-field acoustical holography through a numerical integration procedure by terms of near-field data acquired by the data acquisition system. What's more, another technique is NPA(Noise Path Analysis) that was widely used. If the rotational machine problem was dealt with, you may combine either NAH technique or NPA with Signature Analysis result and hopefully the reasonable solution can be showed up. |
|