Spencer, Sanjay and I have just published a new paper on the variability of breaking wave characteristics and impact loads on offshore wind turbines supported by monopiles. The paper’s conclusions are based on a comprehensive multi-year measurement campaign at the Blyth offshore wind farm off the coast of England.
Ground was broken at MIT’s middleton campus, where Keystone Tower Systems and Northeastern University are installing a 10 kW turbine on a spirally welded tapered tower to demonstrate the viability of this new tower manufacturing process. The anchor cage, which will be embedded in the turbine’s foundation, was just assembled at the STReSS lab (see below) and will ship to site this week.
Last month, we completed our first large-scale test at the STReSS lab — see picture below taken from the overhead crane. The specimen was a spirally welded tube manufactured by Keystone Tower Systems and loaded in pure bending. The hydraulic loading and data acquisition systems both worked perfectly. Next test will be in late October. We are currently adding two laser scanning systems to more accurately characterize imperfections and local buckling. You can read an overview of this project here.
The Department of Energy just announced a $1M grant to Keystone Tower Systems with a subaward to Northeastern. The project will provide a detailed design and certification for a spirally-welded tower supporting a utility-scale wind turbine.
Sanjay, Kai and I have just published a new paper on a method to evaluate the lateral capacity of offshore wind turbines under extreme wind-wave loading.
Vahid’s and my paper on the influence of aerodynamic damping on the seismic response of wind turbines was just published online in the ASCE Journal of Structural Engineering.
Rob Rosa, a 2014 B.S. graduate from UCONN, will be joining the Sustainable Structures Group in early July. Rob will be helping to design and execute our large-scale tests on spirally-welded tubes.
Our hydraulic actuator system at the STReSS lab is fully functional — see below! Our first series of tests is scheduled for July 2014.
I promise that future testing videos posted here will be more exciting than this, but, for now, the best I can do is a video of a slowly moving actuator.
We just finished the design of our test rig — see below. The rig has been designed to test spirally-welded wind turbine towers in pure bending and bending-compression. Max axial force is 400 kips. Max moment is 1600 kip-ft. Tests are scheduled to start this summer at the STReSS lab in Burlington.