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Xuguo Jiao, Guozhong Wang, Xin Wang, Zhenyong Zhang, Yanbing Tian and Xiwen Fan
Due to physical limitations and safety requirements, the rate and amplitude of change in wind turbines? pitch angle are limited, which will bring integral saturation problems to the control system. This leads to the deterioration of the pitch control sys...
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Muhammed S. Parancheerivilakkathil, Zawar Haider, Rafic M. Ajaj and Mohammadreza Amoozgar
This paper presents the development of a novel polymorphing wing capable of Active Span morphing And Passive Pitching (ASAPP) for small UAVs. The span of an ASAPP wing can be actively extended by up to 25% to enhance aerodynamic efficiency, whilst its pi...
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Xinglu Xia, Dongli Ma, Liang Zhang, Xing?an Liu and Keran Cong
With the rapid development of vertical takeoff and landing (VTOL) aircraft, the blade design of a propeller suitable for VTOL aircraft with a wide range of operating conditions has become a challenging and popular task. This paper proposes a multi-object...
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Yolanda Vidal, Leonardo Acho, Ningsu Luo, Mauricio Zapateiro and Francesc Pozo
This paper considers power generation control in variable-speed variable-pitch horizontal-axis wind turbines operating at high wind speeds. A dynamic chattering torque control and a proportional integral (PI) pitch control strategy are proposed and valid...
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Xiyun Yang, Jinxia Li, Wei Liu and Peng Guo
Based on an analysis of the working principles of the hydraulic variable pitch system of a wind turbine, a novel Petri net model and reliability evaluation method are proposed. First, Petri net theory is adopted to build a model for each discrete state o...
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Youming Cai, Mingzhu Li, Tianzhen Wang, Xiaohang Wang and Hubert Razik
Power extraction has become a critical consideration in tidal stream turbine (TST) systems. In practice, the lumped disturbances under varying tidal current conditions may deteriorate the maximum power point tracking (MPPT) performance and cumulate fatig...
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Yu-Ting Yan, Shi-Ming Xu, Cong Liu, Xiao Zhang, Jian-Mei Chen, Xue-Ming Zhang and Yong-Jun Dong
For the design of a horizontal-axis tidal current turbine with adaptive variable-pitch blades, both numerical simulations and physical model experiments were used to study the hydrodynamic performance of symmetrical airfoil blades based on backward swept...
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Zawar Haider, Rafic M. Ajaj and Lakmal Seneviratne
This paper studies the effect of morphing rate on the aeroelasticity of a polymorphing wing capable of active span extension and passive twist/pitch. A variable domain size finite element model is developed to capture the dynamic effects due to the prese...
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Yonggang Mei, Rong Mo, Huibin Sun, Bingbing He and Kun Bu
Cutting chatter is extremely harmful to the machining process, and it is of great significance to eliminate chatter through analyzing the stability of the machining process. In this work, the stability of the milling process with multiple delays is inves...
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Shuli Wang, Ziang Li and Qingxin Zhang
The electric seaplane, designed for take-off and landing directly on water, incorporates additional structures such as floats to meet operational requirements. Consequently, during the take-off taxiing phase, it encounters significantly higher aerodynami...
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Naying Wei, Zhen Zhang, Xu Xu and Wenjuan Yao
To verify that inclined tension legs can improve the stability of the tension leg platform, this paper established the dynamic equation of a tension leg platform (TLP) under marine environmental loads by using the modified Morrison equation considering t...
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Bangchu Zhang, Hao Fu, Weiyu Zhu, Kuijian Yang and Yuanming Xu
The thermal problem of high-altitude airships has an essential impact on position control and energy system performance. Adjusting the airship?s attitude angle causes differences in thermal performance during position alterations. This paper studies an a...
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Herath M. P. C. Jayaweera and Samer Hanoun
Path planning of unmanned aerial vehicles (UAVs) is one of the vital components that supports their autonomy and deployment ability in real-world applications. Few path-planning techniques have been thoroughly considered for multirotor UAVs for pursuing ...
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Songyan Tian, Yanhui Duan and Hongbo Chen
To facilitate future Hypersonic Flight Vehicle (HFV) implementation with high maneuverability throughout its reentry trajectory, an Active Jets-Matrix (AJM) is designed to serve as the flapless pitch control surface. The AJM consists of four control grou...
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Qingli Shi, Hua Wang and Hao Cheng
This paper addresses the issue of a complex three-dimension (3-D) terminal guidance process that is used against maneuvering targets while considering both the terminal impact angle (TIA) and field-of-view (FOV) angle constraints. According to the highly...
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Manuel Lara, Juan Garrido, Mario L. Ruz and Francisco Vázquez
This paper deals with the control problems of a wind turbine working in its nominal zone. In this region, the wind turbine speed is controlled by means of the pitch angle, which keeps the nominal power constant against wind fluctuations. The non-uniform ...
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Haoming Liu, Suxiang Yang, Wei Tian, Min Zhao, Xiaoling Yuan and Bofeng Xu
The operational environment of offshore wind turbines is much more complex than that of onshore wind turbines. Facing the persistent wind and wave forces, offshore wind turbines are prone to vibration problems, which are not conducive to their long-term ...
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Brij Kishor Tiwari and Rajiv Sharma
The design process for Variable Buoyancy System (VBS) is not known in full, and existing approaches are not scalable. Furthermore, almost all the small size Autonomous Underwater Vehicles/Gliders (AUVs/G?s) use very low capacity of buoyancy change (in th...
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Maria Acanfora, Ermina Begovic and Fabio De Luca
Ship accidents that entail flooding may lead to disastrous consequences which could be avoided or mitigated based on the knowledge of damaged ship dynamics. The dynamic behaviour of a damaged hull is a complex phenomenon involving the interaction of the ...
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