Experimental and computational dynamic response comparison of hybrid and mono windmill towers considering soil–structure interaction
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In countries like India, wind turbine heights are rapidly increasing to harvest more wind energy at a given location. In recent years, due to increase in hub height of windmill likelihood, soil lying below foundation may influence dynamic response of wind turbines. By increasing the height of the conventional monopole supporting system, it becomes slender and dynamically sensitive under the influence of soil below foundation; therefore, in the present investigation, hybrid supporting system is proposed to avoid slenderness effect of monopole system. A 1:40 scaled model of 78-m-high conventional monopole windmill and hybrid windmill comprised of nacelle, rotor mass and supporting tower are prepared in the laboratory. To study the behavior of both the towers under operational dynamic loads of rotor, laboratory tests were conducted on scaled model considering soil below foundation. Simulations of experimental analysis are presented for multi-degree of freedom turbine structure subjected to dynamic loading of rotor considering soil stiffness below base. It is examined in terms of displacement in time domain, shear at base of tower and response spectra. From laboratory tests and its simulation, it can be concluded that hybrid supporting system are recommended for windmill towers with higher hub heights considering soil stiffness below foundations.
KeywordsDynamic analysis Hybrid windmill Base shear Soil–structure interaction
The author would like to show their appreciation to the department of applied mechanics, Sardar Vallabhbhai National Institute of Technology, Surat, India, for providing laboratory facilities and other instruments for this research. The authors also show their appreciation to Nuta et al. (2011) for using various data of windmill tower in present investigation from their research work.
This study has not been funded from any funding agencies.
Compliance with ethical standards
Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
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