Browsing by Author "Su, H. M."

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Development of Glass-fabric Composite Wind Turbine Blade
(2011)
Kam, T. Y.
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Su, H. M.
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Wang, B. W.
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機械工程學系
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Department of Mechanical Engineering
The development process of a glass-fabric composite wind turbine blade is presented. A finite element model is constructed for the design and stress analysis of the wind blade. The wind blade parts were fabricated using the vacuum-bag molding technique. The assembling process of the wind blade is described in detail. The wind blade was tested to validate the suitability of the design. The finite element method is used to predict the failure wind loads of the wind blade.
Mechanical Reliability Analysis of Pneumatic Solenoid Valve Considering Airflow Disorder
(2016-01-01)
Huang, C. Y.
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Su, H. M.
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Jian, B. S.
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Yao, C. L.
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Kam, T. Y.
The mechanical reliability of a pneumatic solenoid valve is studied with the consideration of the failure mode of airflow disorder. The key mechanical components that have important effects on the improper airflow phenomenon are identified as the conical compression spring and rubber O-ring seal. The limit states of key components are constructed via the failure analyses of the components. The probability distributions of the random variables together with the limit states are used to determine the failure probabilities of the key components. A method established on the basis of the series system model is used to estimate the failure probability of the solenoid air valve for the failure mode of airflow disorder.
Quasi-static buckling and first-ply failure loads of shear web reinforced glass-fabric composite wind blades
(2017-01-15)
Kam, T. Y.
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Su, H. M.
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Huang, C. Y.
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機械工程學系
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Department of Mechanical Engineering
A procedure is proposed to analyze the structural failure of a composite wind blade subjected to quasi-static loads. The structural failure of a wind blade under extreme wind loads which can be treated as quasi-static loads is an important issue to be tackled when assessing the reliability of a wind turbine. In the proposed structural failure analysis procedure, the geometrically nonlinear finite element (FE) method together with several phenomenological failure criteria is used to investigate the possible failure modes such as incipient buckling, interfacial debonding, and first-ply failure of the blade via an incremental loading approach. The failure loads and locations associated with the possible failure modes for a number of small wind blades with different structural configurations are determined to study the appropriateness of the failure criteria. Static tests of several small glass-fabric composite wind blades were conducted to validate the suitability of the proposed procedure. It has been shown that the experimentally and theoretically predicted failure processes of the wind blades are in good agreement. The applications of the proposed procedure are demonstrated by means of a numerical example in which the failure process of a wind blade under quasi-static wind loads is simulated. (C) 2016 Elsevier Ltd. All rights reserved.
Reliability analysis of composite wind turbine blades considering material degradation of blades
(2020-02-15)
Su, H. M.
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Kam, T. Y.
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交大名義發表
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National Chiao Tung University
In this study, a set of analytical methods was proposed to evaluate the reliability of composite wind turbine blades after material aging, and to improve the blade structure strength to enhance its reliability. Because, the material aging will occur when the blade is affected by the external environment for a long time, consequently, time is an extremely important factor in reliability. Therefore, it is necessary to simulate the effect of environment on materials by aging experiments, so as to obtain the relationship between time, material strength and material constant. The reliability evaluation method used in this study is the direct integration method, which can quickly evaluate the reliability of blades degraded by materials. Because the reliability of the unmodified blade impossible be more than 98% after 20 years, it is necessary to improve the blade and then evaluate the reliability. The weight of the improved blade increased by only 8.57%, but the wind speed of buckling could be delayed by 32.47%, and the reliability could be more than 99% after 20 years, so the improved method meets the demand.