08018-2011

Combination of spectra in Common Data Files from ESDU Aircraft Noise Data Items

08018-2011 发布历史

There is a standard file structure for recording noise spectra and other data which is used throughout the ESDU Aircraft Noise Series. Most Items employ this Common Data standard. There is an on-going programme to enable every relevant program to read and write such data files. This standard file specification enables computer programs from the ESDU Aircraft Noise Series to be run successively@ that is@ the output from one program can be used as an input for another. At other times@ the user may wish to combine spectral levels contained in Common Data Files that have been generated by different programs. This Item facilitates the combination of spectral levels. Spectra at any given location can be added or subtracted either on a logarithmic or an arithmetic basis. Aircraft or engine noise is usually predicted by calculating the noise produced from more than one source and then adding the individual source noise predictions together. The addition of such spectra must be performed on an energy@ i.e. logarithmic@ basis. If@ however@ corrections like those for ground-reflection@ atmospheric absorbtion attenuation or duct liner attenuation have to be made@ arithmetical combinination of spectral levels is required. A computer program known as ESDUpac A0818 accompanies this Item.

08018-2011由ESDU - Engineering Sciences Data Unit 发布于 2011-03-01，并于 2011-06-17 实施。

08018-2011的历代版本如下：

• 2008年12月01日 08018-2008
• 2011年03月01日 08018-2011

非常抱歉，我们暂时无法提供预览，您可以试试： 免费下载 08018-2011 前三页，或者稍后再访问。

注意： 点击下载后，生成下载文件时间比较长，请耐心等待......

标准号

08018-2011

发布日期

2011年03月01日

实施日期

2011年06月17日

废止日期

无

中国标准分类号

/

国际标准分类号

/

发布单位

ESDU - Engineering Sciences Data Unit

引用标准

11

适用范围

There is a standard file structure for recording noise spectra and other data which is used throughout the ESDU Aircraft Noise Series. Most Items employ this Common Data standard. There is an on-going programme to enable every relevant program to read and write such data files. This standard file specification enables computer programs from the ESDU Aircraft Noise Series to be run successively@ that is@ the output from one program can be used as an input for another. At other times@ the user may wish to combine spectral levels contained in Common Data Files that have been generated by different programs. This Item facilitates the combination of spectral levels. Spectra at any given location can be added or subtracted either on a logarithmic or an arithmetic basis. Aircraft or engine noise is usually predicted by calculating the noise produced from more than one source and then adding the individual source noise predictions together. The addition of such spectra must be performed on an energy@ i.e. logarithmic@ basis. If@ however@ corrections like those for ground-reflection@ atmospheric absorbtion attenuation or duct liner attenuation have to be made@ arithmetical combinination of spectral levels is required. A computer program known as ESDUpac A0818 accompanies this Item.