DNV GL has announced three Joint Industry Projects (JIPs) aimed at developing recommended practices for the global wind industry to further develop industrial accepted design practices and methods, lower risks and reduce costs.
The first JIP is "Coupled Dynamic Analysis of Floating Wind Turbines”. Floating wind provides an opportunity to globalise offshore wind as a technology in a wide range of international markets. A key technical barrier to making this vision a reality is the ability to carry out a sufficiently accurate fully dynamic analysis, which requires integration of several engineering disciplines.
At this moment there is no guideline on how to run such analysis, how to validate the numeral design model, and which complexity level is needed for the different project stages. The aim of this JIP is to gain a deeper understanding of the coupled dynamic analysis of floating wind turbines and develop recommendations to effectively guide designers and engineers. The project is scheduled to start in the second half of 2015, with final review and publication of recommended practices in the first half of 2017. A total of eight to twelve participating companies are anticipated.
Validation of Turbulence Models
“Validation of Turbulence Models” is the second JIP. DNV GL sees large variations in the predicted loads for wind turbines and wind farms experienced throughout their operational life due to variations in wind speed (turbulence). Even though some parameters relating to turbulence are standardised, a number of different methods can be applied, leading to differences of up to twenty to thirty per cnet on the final prediction of loads.
The aim of this JIP is to gain a deeper understanding of which turbulence methods should be used under which circumstances. Specific recommendations shall be published to guide the industry through the load validation and site assessment process, which relies on accurate turbulence models. The project is scheduled to start in the second half of 2015, with final review and publication of recommended practices in the first quarter of 2017. A total of fifteen to twenty participating companies are anticipated.
Design, Installation and Maintenance of Heavy Duty Bolted Joints
The third JIP is “Integrated Approach to Design, Installation and Maintenance of Heavy Duty Bolted Joints”. Bolted joints are often the weak link in the design of wind turbine structures and in some cases their strength may even limit the design options for the components they join together. Significant cost and material savings could be achieved through optimising structural bolted joints by employing more ambitious design philosophies than traditional approaches.
The aim of this JIP is to enable wind turbine designers to further optimise the structural bolted joints and thus the dimensions and weights of the joined parts, while lowering the risk of damage in the field. It will also enable wind farm operators to reduce costs related to inspection, corrosion protection and retightening of bolted joints, which make up a major part of the operating expenses, especially offshore. The project is scheduled to start in autumn 2015 and is planned to run until the end of 2016. A total of six to ten participating companies are anticipated.
Cost Reduction Manifesto
Last year, DNV GL launched its vision for the future of offshore wind in a cost reduction manifesto, including a commitment to work collaboratively with industry to help reduce offshore wind costs by up to forty per cent and thus secure a sustainable future for this sector.
