VIBRATION RESPONSE OF MONO AND MONO LATTICE STRUCTURAL SUPPORTING SYSTEM USING NUMERICAL MODELING FOR TALL WIND MILL TOWERS

The conventional sources of power generation are diminishing constantly and more dependency on renewable sources becomes mandatory and wind energy is actively pursued in recent years in India and world. In India State like Gujarat has more wind potential available and more energy can be harvested by increasing height of wind mill. This wind mill towers are attributed by heavy mass of nacelle at top and rotor at eccentric distance. Conventional Wind mill turbines supporting structures are constructed using either mono type or lattice type structural system. In present investigation combination of mono lattice type structural system and conventional mono system is investigated for 125 m high tower and vibration response of both system is compared. Detailed dynamic analysis of supporting structure under working loads are performed in FE software and the response of both system is quantified in terms of shear at base, shell stresses and displacement at top in time domain. From investigation it reveals that mono lattice supporting system is less sensitive to loads caused during operation of wind mill and less dynamic magnification appears in mono lattice system compared to conventional mono system. It is concluded that mono-lattice system can be used for higher hub height wind mill towers to harvest more wind energy