NoiseMap 5.2.9 has now been given a full release.
\n(versions 5.2.7 and 5.2.8 were not released publicly)<\/p>\n
Users are strongly advised not to run different versions of NoiseMap on the same database, as this can lead to problems.<\/p>\n
ISO9613-2 Barrier Calculation This\u00a0adds to the existing barrier calculation\u00a0options in the SiteNoise module, so now you can choose from:<\/p>\n The ISO calculation requires octave band noise source data, as the attenuation\u00a0 is evaluated\u00a0for each octave. The ISO procedure has a ‘meteorological correction’ which has the effect of reducing the path difference used to calculate the barrier attenuation.\u00a0 This correction is used to take into account the scattering of sound into the barrier’s shadow zone, caused by atmospheric turbulence under downwind propagation. This means that the barrier attenuation will be less than calculated by some other procedures.<\/p>\n It should also be noted that the NoiseMap implementation does not include the effect of diffraction around the vertical edges of barriers.\u00a0 The procedures described in the ISO\u00a0provide for propagation over the top edges\u00a0of multiple barriers one behind the other, but do not describe how\u00a0diffraction from the vertical edges of multiple barriers should be assessed.\u00a0 This is an issue that other authors have commented on and various work-arounds have been suggested.<\/p>\n Although in particular circumstances (with a source and receiver just grazing the vertical edge, and with no other significant\u00a0sources or barriers) this may lead to under-prediction, in general this is not considered to be a material issue.<\/p>\n It may also be noted that it is unclear as to how the ISO expects ground correction to be assessed in the presence of a barrier.\u00a0 This is again the subject of debate amongst authors.\u00a0 NoiseMap will assume hemispherical radiation (i.e. the presence of a ground reflection) and will correct this value either for the soft ground effect, or the barrier effect, but not both, using whichever gives the lower noise level.<\/p>\n NoiseMap Ltd has discussed these issues with a number of experts and considers that this is a reasonable\u00a0implementation of the method.<\/p>\n Other Improvements A new release of the User Manuals is now pending.<\/p>\n Many new scripting options have been added – allowing you to import and export Categories and Combinations, and to export full analysis of calculation details for receiver points.<\/p>\n","protected":false},"excerpt":{"rendered":" NoiseMap 5.2.9 has now been given a full release. (versions 5.2.7 and 5.2.8 were not released publicly) Users are strongly advised not to run different versions of NoiseMap on the same database, as this can lead to problems. ISO9613-2 Barrier Calculation The headline feature in this release is\u00a0a new\u00a0ISO9613-2 barrier calculation option.\u00a0 This option is … Continue reading NoiseMap 5.2.9 Full release<\/span>
\n<\/strong>The headline feature in this release is\u00a0a new\u00a0ISO9613-2 barrier<\/strong> calculation<\/strong> option.\u00a0 This option is part of the SiteNoise Calculation module, which is based on BS5228 with enhancements.<\/p>\n\n
\n<\/strong>NoiseMap is currently being used on several large, demanding projects with multiple remote users accessing the system over the internet.\u00a0 Under intensive use, this puts a heavy load on both client and server machines. We have made some internal changes to improve the efficiency of the process and reduce the demands on the server and internet.<\/p>\n