Dynamic Analysis of Bladeless Wind Power Generators Using Self-Adjustment Virtual Stiffness (SAVS)

Authors

1 Department of Solid Mechanics, Faculty of Mechanical Engineering< university of Kashan

2 Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan

10.22044/jsfm.2026.17310.4035

Abstract

In bladeless wind power generators, the narrow lock-in region between the natural frequency of the structure and the vortex-shedding frequency significantly limits the energy harvesting efficiency under variable wind conditions. In this study, a stiffness-adjustment mechanism was designed and implemented to overcome this limitation by altering the free length of the oscillating rod, enabling real-time tuning of the natural frequency to match the vortex frequency. A three-dimensional model of the system was developed in SolidWorks, and coupled fluid–structure simulations were performed using the CFD approach in ANSYS Fluent. The numerical model was validated against the experimental results of Lee et al., showing good agreement. The findings indicate that the proposed stiffness-adjustment mechanism effectively expands the lock-in region, increases the oscillation amplitude, and thereby enhances the energy harvesting efficiency. Numerical results revealed that at wind speeds above 4 m/s, the mechanism can improve system performance by up to 20 times, while at lower wind speeds the improvement remains significant though less pronounced. This approach offers a promising solution to improve the performance of bladeless wind generators operating under urban wind conditions in Iran.

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Journal of Solid and Fluid Mechanics
Volume 16, Issue 3
July and August 2026
Pages 221-231

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