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| Experiment on vibration frequency and stress characteristics of wheel in wind turbine |
| Ma Jianlong1,2, Wang Jianwen1,2, Dong Bo1, Wei Haijiao1 |
| 1.School of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China; 2.Mi-nistry of Education Key Laboratory of Wind Energy and Solar Energy Utilization Technology, Hohhot, Inner Mongolia 010051, China |
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Abstract The static natural frequency and dynamic vibration frequency of three 1.4 m diameter wheels in a small horizontal-axis wind turbine were measured by using Pulse16.1 structure vibration analysis system. It was identified that the aerodynamic load has a weaker effect on the 2nd-order or less dynamic frequency of vibration; furthermore, the load affects the 1st and 2nd-dynamic frequencies of anti-symmetric vibration slightly dominated than on those of symmetric vibration. The centrifugal force exhibits a relatively remarkable influence on the 2nd or less order dynamic frequency of vibration,especially the force can affect the 1st and 2nd-order dynamic frequency of symmetric vibration more greatly than on those of anti-symmetric vibration. Besides, the vibration stress caused from disc effect is higher than the other 2nd or less vibration stresses. The vibration stress caused from axial movement effect is in between the 1st and 2nd order vibration stresses. This observation is quite different from the vibration stress measured from a static wind wheel. Clearly, it is inappropriate that the dynamic vibration stress is analyzed indirectly through measuring the stresses in a static wheel. These results can provide some new ideas and a theoretical support in analysis of fatigue damage or break which frequently occurs in wind turbine wheels in a period of time that is much shorter than the design life span of a wheel. Meanwhile, they can provide a theoretical support in designing a reasonable dynamic performance for the wheel in a small-scale wind turbine.
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Received: 09 May 2013
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