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Dynamic analysis of propulsion mechanism directly driven by wave energy for marine mobile buoy

  • Mechanism and Robotics
  • Published:
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Abstract

Marine mobile buoy(MMB) have many potential applications in the maritime industry and ocean science. Great progress has been made, however the technology in this area is far from maturity in theory and faced with many difficulties in application. A dynamic model of the propulsion mechanism is very necessary for optimizing the parameters of the MMB, especially with consideration of hydrodynamic force. The principle of wave-driven propulsion mechanism is briefly introduced. To set a theory foundation for study on the MMB, a dynamic model of the propulsion mechanism of the MMB is obtained. The responses of the motion of the platform and the hydrofoil are obtained by using a numerical integration method to solve the ordinary differential equations. A simplified form of the motion equations is reached by omitting terms with high order small values. The relationship among the heave motion of the buoy, stiffness of the elastic components, and the forward speed can be obtained by using these simplified equations. The dynamic analysis show the following: The angle of displacement of foil is fairly small with the biggest value around 0.3 rad; The speed of mobile buoy and the angle of hydrofoil increased gradually with the increase of heave motion of buoy; The relationship among heaven motion, stiffness and attack angle is that heave motion leads to the angle change of foil whereas the item of speed or push function is determined by vertical velocity and angle, therefore, the heave motion and stiffness can affect the motion of buoy significantly if the size of hydrofoil is kept constant. The proposed model is provided to optimize the parameters of the MMB and a foundation is laid for improving the performance of the MMB.

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Authors and Affiliations

  1. College of Engineering, Ocean University of China, Qingdao, 266100, China

    Zhenjiang Yu, Zhongqiang Zheng, Xiaoguang Yang & Zongyu Chang

  2. Key Lab of Ocean Engineering of Shandong Province, Qingdao, 266100, China

    Zhenjiang Yu & Zongyu Chang

Authors
  1. Zhenjiang Yu
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  2. Zhongqiang Zheng
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  3. Xiaoguang Yang
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  4. Zongyu Chang
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Corresponding author

Correspondence to Zongyu Chang.

Additional information

Supported by National Natural Science Foundation of China(Grant No. 51175484), Program for New Century Excellent Talents in University, China(Grant No. NCET-12-0500), Program of Introducing Talents of Discipline to Universities, China(Grant No. B14028), and Fundamental Research Funds for the Central Universities, China(Grant No. 841513053)

YU Zhengjiang, born in 1988, is currently a PhD candidate at Ocean University of China, China. He received his master degree on mechatronics engineering in Ocean University of China, China, in 2014. His research interests include mechatronics engineering and ocean engineering.

ZHENG Zhongqiang, born in 1986, is currently a lecturer at Ocean University of China, China. He received his PhD degree from Ocean University of China, China, in 2015. His research interests include mechatronics engineering and ocean engineering.

YANG Xiaoguang, born in 1990, is currently a master candidate at Ocean University of China, China. He received his bachelor degree from Ocean University of China, China, in 2013. His research interests include mechatronics engineering and ocean engineering.

CHANG Zongyu, born in 1973, is currently a professor and a PhD candidate supervisor at Ocean University of China, China. He received his PhD degree from Tianjin Universtiy, China, in 2000. His research interests include mechatronics engineering, bionics, robotics and ocean engineering.

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Yu, Z., Zheng, Z., Yang, X. et al. Dynamic analysis of propulsion mechanism directly driven by wave energy for marine mobile buoy. Chin. J. Mech. Eng. 29, 710–715 (2016). https://doi.org/10.3901/CJME.2016.0317.032

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  • DOI: https://doi.org/10.3901/CJME.2016.0317.032

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