johng Posted June 13, 2008 Report Share Posted June 13, 2008 See the example PDF above... The extension of each bar in the wind rose from ?innercircle? towards ?outer circle? represents the percentage of the time the windblew from those various directions. The outer circle percentage indicatesthe amount of relative uniformity of the wind direction. For example, ifthere was a very strange site where the wind only blew from one direction allthe time, and never from any other direction, there would be a single bar goingout from 0 to 100%. Most sites, however, have more scatter with winddirections distributed among numerous directions. All of the barsextending out will of course add up to 100% of the time period that wasmeasured. The ?outer circle? value is intended to provide some contextfor the graph so that at a quick glance, you can tell that at the site below,almost 30% of the time, the wind direction was southwest, another 25% or so wasnorth, and then the rest of the directions are distributed among the otherdirections to add up to the remaining 45%. windrose-sample-report.pdf Link to comment Share on other sites More sharing options...
RexRoehl Posted March 5, 2009 Report Share Posted March 5, 2009 Please explain the numbers around the outside of the circle which don't add to 1. Link to comment Share on other sites More sharing options...
johng Posted March 5, 2009 Author Report Share Posted March 5, 2009 Hi - The outer numbers are the Turbulence Intensity (TI) for each sector. Higher values represent more turbulent winds while lower values represent less turbulent winds. I've included a definition of TI from our knowledgebase... Calculation of Turbulence Intensity on SDR wind rose reportTurbulence intensity (Ti)is defined as the windspeed interval standarddeviation (SD) divided by the windspeed interval average (AVG)... Ti = SD/AVG Onthe windrose, the samples are first sorted by direction into sectors.In each sector, there will be "n" samples. A Ti is calculated for eachsample and an average Ti is then created for the sector... WindRose Ti for each sector = (SD/AVG + SD/AVG + SD/AVG...n)/n Note that SDR defaults to 16 sectors for a standard windrose. Thanks! Link to comment Share on other sites More sharing options...
bob merphy Posted September 5, 2013 Report Share Posted September 5, 2013 hello I am looking for help regarding the numbers on SDR like #40 .... and can anyone tell me where to find the direction column also what are the channels used for meaning what is the role behind each channel? thanks Link to comment Share on other sites More sharing options...
bob merphy Posted September 6, 2013 Report Share Posted September 6, 2013 hello i really need your help Link to comment Share on other sites More sharing options...
David Carlson Posted September 9, 2013 Report Share Posted September 9, 2013 Have you looked through the "reports" section of the Symphonie manual? There you will find detail on setting up wind rose reports: http://www.nrgsystems.com/FileLibrary/e4c1a4b10a594610a419a93278dcef03/NRG_Symphonie_Data_Logger_Manual%20-%20Rev.5.08.pdf Directions begin on page 85. Link to comment Share on other sites More sharing options...
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