Present wind turbine gearbox design usually includes one or twoplanetary gear stages and at least one high speed helical gearstage, which play an important role regarding noise and vibrationbehavior. Next to the overall noise of the gearbox and thestructure-born noise on the gearbox housing also tonal noise isbecoming a much more important issue in recent years. Since tonalnoise is problematic due to the human perception as”uncomfortable”, avoidance is important. Conventional theoriesregarding low noise gear design are not developed in view of tonalnoise. This leads to the question: How to deal with tonal noise inthe design stage and which gear parameters can be used for anoptimization regarding good tonal noise behavior? Within a researchproject measurements have been performed on different gearboxesusing different gear designs. These measurements have beenevaluated according to ISO/IEC 61400-11 and the results have beenanalyzed in view of the influence of different gear parameters. Itwas also investigated if it is possible to rank gearboxes in windturbines according to their tonal noise behavior as observed on thetest rig. The paper will give an introduction into the definitionof tonal noise according to ISO/IEC 61400-11 and give insight inmeasurement results from test rigs and from gearboxes in the field,where noise behavior is also evaluated according to ISO/IEC61400-11. Furthermore, the paper will show and discuss the linkbetween measurement results and different gear parameters, whichare affecting tonal noise behavior. In addition simulation resultswill be presented, showing how tonal noise can be estimated withinthe design stage using state-of-the-art calculation software. Thepaper will give recommendations regarding a gear design processthat is considering tonal noise in the design stage and willcompare an, regarding tonal noise, improved gear set with an olderone.
- Edition:
- 10
- Published:
- 10/01/2010
- Number of Pages:
- 19
- File Size:
- 1 file , 740 KB
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