Vibration Test, Anti-seismic And Wind-resistance Analysis Of Large Cone Wind Tower Structure

As the support structure of wind power equipment, the tower structure’s safetyperformances directly affect the wind power system’s normal running. This paper take a1.5MW cone wind power tower in Inner Mongolia for object, and take vibration test to windpower tower structure in service firstly, on the basis, simplified the tower structure duly andestablish model using finite element software ANSYS, and then do modal analysis, staticanalysis and seismic response analysis to the tower model, obtained the tower dynamicresponse in the wind load and seismic load, find tower weak positions and considered theinfluence of vertical earthquake role and the foundation stiffness to the dynamic response oftower.The results of the study show that: the tested results is close to the finite elementsimulation results, the first order frequency is0.5, first-order damping ratio is1.82%, andtower won’t happen resonance damage; the rotor thrust under rated wind speed achievemaximum when generate electricity normally, the storm wind speed is the most adverse windload condition, the top displacement is close to the limit and material strength have larger richunder storm wind speed; tower top displacement and stress in seven degrees under the action ofthe rarely met earthquake and combined action of seven degrees more severe earthquake and the ratedwind were less than that of storm load, in the combined action of seven degrees rarely met earthquakeand rated wind, the tower is in elastic stage, but the top displacement exceed the normal use limit, thevertical seismic has little impact in tower stress and top displacement; soil and structureinteraction has large effect on the dynamic response, the contact place of tower bottom andfoundation and door opening has a stress concentration, which is tower’s weak positions,tower’s good anti-seismic system design must consider soil and structure interaction.The vibration test and finite element static dynamic response analysis results of windpower tower structure in this paper can provide certain reference for wind power tower andsimilar structure’s research, design and vibration control.