关于修改基准声压的方法

superxjw

之前在论坛上看到有朋友对修改VL中基准声压不熟悉（主要是一些做水声的朋友），其实这部分资料在OLH里面有很明确讲解的，今天我把OLH里面关于修改基准声压的资料贴上来，供大家参考。

How to Change the Reference Pressure dBValue

LMS Virtual.Lab allows you tochange the reference sound pressure level of (the default is 20 micropascals)used to calculate dB values. The reference sound pressure level is set in the dB_scale file in the VLinstallation files. This reference value can be changed manually. To modifythis value, go to the <Path toInstallation>/<OS Type>/reffiles/ dB_scale file e.g.C:\Program Files\ LMS\LMS Virtual.Lab 12\win_b64\reffiles\dB_scale. Right-clickthedB_scale file as shown in the image below:

Select the option Open from itscontextual menu and in the Open With dialog box, select WordPad as shown in theimage below:

Click the OK button to close the dialog box. The dB_scale – WordPad file opens. Inthis file, each field is separated by a tab. There are five columns such as PHYSICALTYPE, MAGNITUDE, TYPE, DBFACTOR andDBREFERENCE. To change thereference pressure dB value, go to main menu Edit file:///C:/Users/DELL/AppData/Local/Temp/msohtmlclip1/01/clip_image001.gif Find or press the Ctrl+F button on the keyboard. In the Find what field, type pressure and click on the Find Next button. Search forthePressure as the Physical Type and change the DBREFERENCE value as per yourequirement which is shown in the image below:

By default, the DBREFERENCE value for pressureis 0.00002 (20 micropascals)which is for standard reference sound pressure level air. You can change the DBFACTOR and the DBREFERENCE values of otherPhysical Types.

The consequences of changing the DBREFERENCE of Physical Type Pressure are,

· This changed DBREFERENCE value will applyto all the data which are having the same unit in VL.

· Any changes youmade to the dB_scale file are undone when a new VL version is installed.

· Changes you do inone installation will apply for all users that use the same installation.

Little_Se7en

顶伟哥  计算流噪声那会儿还特意跟你请教过呢

s2014ml

刚学的菜鸟我也不太清楚

xtooouui

学习了！请斑竹指教一下这个问题吧:)
http://forum.simwe.com/thread-1120759-1-1.html

xtooouui

学习了！请斑竹指教一下这个问题吧
http://forum.simwe.com/thread-1120759-1-1.html

mind1991

请问徐老师，如果在水中分析声压级，需要修改参考dB值为1e-6吗？:hug:

mind1991

如果计算水的声压级的话，dB—scale文件中所有的0.00002都替换成0.000001吗？

lengxuef

mind1991 发表于 2018-1-1 22:42
请问徐老师，如果在水中分析声压级，需要修改参考dB值为1e-6吗？

需要修改。

lengxuef

mind1991 发表于 2018-1-1 22:58
如果计算水的声压级的话，dB—scale文件中所有的0.00002都替换成0.000001吗？

只需要把Pressure 里面，superxjw版主帖子中搜索到的那一项中的0.00002修改一下，就行了。

mind1991

感谢冯博士的耐心解答！
前几天给您的留言可以帮我看一下么
http://forum.vibunion.com/thread-155470-1-1.html
:hug::hug:

mind1991

lengxuef 发表于 2018-1-3 10:46
需要修改。

感谢冯博士的耐心解答！
前几天给您的留言可以帮我看一下么，我搞了好多天都没有头绪（在MATV里，研究潜艇在水下各界模态声辐射贡献量），不知道VL里是否可行呢~
http://forum.vibunion.com/thread-155470-1-1.html
:hug::hug:

lengxuef

mind1991 发表于 2018-1-3 12:44
感谢冯博士的耐心解答！
前几天给您的留言可以帮我看一下么，我搞了好多天都没有头绪（在MATV里，研究潜 ...

MATV可以做啊。