1st article bedplate
1st article bedplate getting strain gauges for accelerated fatigue testing
Bedplate strain gauging
Bedplate showing strain gauge installation at a hot-spot
Accelerated fatigue testing data acquisition
Signal conditioning for strain gauges installed during accelerated fatigue testing of bedplate
Accelerated fatigue tester in operation
The swinging unbalanced masses apply a simulated rotor moment range of ~50 kNm (~37,000 ft-lbs)
Accelerated fatigue tester in operation
Close up view of swinging unbalanced masses (slo-motion)
Accelerated fatigue tester in operation
Slow motion video
GFD shaft assembly
GFD shaft assembly being installed on GFD bedplate
GFD shaft and bedplate
Assembly of GFD shaft and bedplate in shop in preparation for installation
1st production bedplate
Arrival of 1st production bedplate
Bedplate & shaft comparison
GFD bedplate and shaft next to original bedplate and shaft
Bedplate & shaft comparison
GFD bedplate and shaft next to original bedplate and shaft
GFD bedplate and shaft
Rebuild of turbine with GFD bedplate and shaft ready for fiberglass fairing installation
GFD bedplate and shaft
Rebuild of turbine with GFD bedplate and shaft ready for fiberglass fairing installation
GFD bedplate and shaft
Retrofit turbine with new GFD bedplate and shaft - lower fiberglass fairing installed
Old bedplate crack
Bedplate weld crack can be seen on top of Bandaid weld
GFD bedplate and shaft retrofitted turbine
GFD bedplate and shaft retrofit ready for tower top installation
GFD shaft build
Reusing old hub with new GFD shaft
GFD shaft build
GFD shaft built with new bearings and seals
Taking the GFD bedplate off accelerated fatigue test rig
The GFD bedplate far exceeded the 20 year fatigue life mark without any signs of failure or cracking. It was removed to make room to test an EWP OEM bedplate.
EWP OEM bedplate being installed on accelerated fatigue test rig
EWP bedplate will be tested on the accelerated fatigue test rig.
Crack growth on EWP OEM bedplate
A crack appeared within a few hours on the test rig. This time lapse video represents 6 hours of continued loading on the test rig (time lapse interval was 1 minute).
EWP OEM bedplate crack on test rig
The EWP OEM bedplate showed a small crack at the weld toe after about 2 hours. The crack grew to this size after an additional 6 hours on the accelerated fatigue test rig.
CMM of GFD shaft
Using Coordinate Measuring Machine (CMM) as part of the quality control process
Fabrication of bedplate
CNC machining of bedplate
GFD bedplate
Current GFD bedplate can accomodate additional yaw drive and comes in safety orange
GFD bedplate
Prepared for shipping
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