Offshore Wind Turbine Software Anniversary

Press Release
Wednesday, February 06, 2013
Dr Andrew Garrad: Photo credit GL Garrad Hassan

GL Garrad Hassan marked the 20th anniversary of the launch of 'Bladed' software at the recent EWEA Conference in Vienna.

GL Garrad Hassan pioneered the development of design tools for wind, wave and tidal energy devices and Bladed is now recognised as the industry standard design tool for wind turbines with 450 licences held by 250 clients worldwide. The majority of Bladed users are turbine manufacturers, with the remainder being made up from component suppliers, certification agencies and
consultants, Bladed has been used to analyse hundreds of turbine designs and thousands of installed turbines.

Bladed was introduced in February 1993. Since then the tool has been under continuous development. In 2000, the ability to calculate wave and current loads was added and since 2002 a linearization module has allowed linear state space models to be exported in control algorithm design. 2006 saw the introduction of multiple-member offshore support structure capability, as
large offshore turbines began to be mounted in deeper water on structures such as jackets and tripods.

As the code requirements for the electrical grid became ever more stringent, the Bladed team responded to the needs of the industry with the release of the Electrical dynamics module in 2010, which allowed for the detailed analysis of events such as grid faults and low voltage ride through. Additionally, the structural dynamics at the very core of Bladed were updated, as the explicitly defined equations of motion were replaced by a general multi-body dynamics formulation. This further improved the accuracy
and robustness of the simulation results and was a vital step in enabling offshore floating turbines to be modelled in Bladed.

Dr Andrew Garrad, founder and Chairman of GL Garrad Hassan said: "It is an amazing feat of intellectual achievement to take a gigantic complex machine excited by an equally complicated wind flow, turn it into a mathematical model, solve the equations and find that the answers predict reality."

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