The application of Structural Health Monitoring (SHM) in international aviation has evolved from its initial focus on monitoring aircraft structural loads to encompassing damage detection, localization, and structural lifespan prediction. Traditional systems face challenges such as complex cable arrangements and limitations imposed by battery life and replacement difficulties. In response, this study explores a novel approach using vibration energy harvesting (VEH) to power helicopter SHM systems. By leveraging piezoelectric materials and VEH technology, we designed a miniature vibration energy harvester based on the key piezoelectric material Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT). Finite element simulations and experimental validations demonstrate stable performance of the system under varying temperatures and accelerations, showcasing its potential reliability in practical applications. This research not only contributes technical insights for the development of Helicopter Health and Usage Monitoring Systems (HUMS) but also underscores the significant potential of vibration energy harvesting technology in enhancing energy sustainability.
This paper introduces the importance of airborne strain testing and the limitations of existing methods. To address the problem of traditional contact measurement that may affect the test position and installation, an airborne strain measurement method based on digital speckle images is proposed. This method utilizes an optical measurement system and image processing algorithm to calculate the strain value, which has the advantages of non-contact and high precision. The maximum value of non-linearity error for this measurement method is 0.56%, a reduction of 5.1% compared to the conventional measurement method. The application of this technology will help improve the safety and economy of aircraft.
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