{"$comment":"Generic 4.2 MW onshore turbine class (illustrative, not a specific manufacturer). Power curve at air density 1.225 kg/m3.","name":"4.2 MW class, 150 m rotor","ratedKW":4200,"rotorM":150,"hubM":125,"cutIn":3,"ratedWind":12.5,"storm":{"cutOut":25,"gustCutOut":32,"restart":22,"restartGust":28,"hwrtStart":23,"hwrtStop":30,"hwrtGustStop":36,"hwrtMinShare":0.3},"powerCurve":[[3,20],[3.5,70],[4,150],[4.5,250],[5,380],[5.5,540],[6,720],[6.5,930],[7,1170],[7.5,1440],[8,1740],[8.5,2060],[9,2400],[9.5,2740],[10,3070],[10.5,3380],[11,3660],[11.5,3900],[12,4080],[12.5,4170],[13,4200],[25,4200]],"thrustCurve":[[3,0.82],[8,0.8],[10,0.7],[12,0.5],[15,0.28],[20,0.14],[25,0.08]],"rotor":{"minRpm":4.6,"maxRpm":10.8,"tsr":8},"drivetrain":{"gearRatio":120,"hssPinionTeeth":25,"imsRatio":5.6,"hssBearingBPFO":6.1,"mainBearingBPFO":7.9,"genBearingBPFO":3.6},"towerHz":0.22,"components":[{"id":"rotor","name":"Rotor and blades","metric":"1P acceleration at the nacelle","unit":"m/s²","band":"0.1–10 Hz","base":0.07,"limits":[0.3,0.5],"ref":"set like VDI 3834-1 nacelle zones (illustrative)"},{"id":"pitch","name":"Pitch system","metric":"blade angle difference","unit":"°","band":"angle","base":0.2,"limits":[1,2],"ref":"manufacturer tolerance (illustrative)"},{"id":"mainbearing","name":"Main bearing","metric":"vibration velocity RMS","unit":"mm/s","band":"10–1000 Hz","base":0.8,"limits":[2,3.2],"ref":"set like VDI 3834-1 zones (illustrative)"},{"id":"gearbox","name":"Gearbox","metric":"vibration velocity RMS","unit":"mm/s","band":"10–1000 Hz","base":1.7,"limits":[3.5,5.6],"ref":"VDI 3834-1 gearbox zones"},{"id":"generator","name":"Generator","metric":"vibration velocity RMS","unit":"mm/s","band":"10–1000 Hz","base":2.6,"limits":[6,10],"ref":"set like VDI 3834-1 zones (illustrative)"},{"id":"yaw","name":"Yaw system","metric":"misalignment to the wind","unit":"°","band":"angle","base":1,"limits":[4,8],"ref":"operator practice (illustrative)"},{"id":"tower","name":"Tower","metric":"fore-aft acceleration","unit":"m/s²","band":"0.1–10 Hz","base":0.08,"limits":[0.3,0.5],"ref":"set like VDI 3834-1 tower zones (illustrative)"}]}