ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2018, Vol. 39 ›› Issue (11): 122156-122167.

• Fluid Mechanics and Flight Mechanics •

### Wind-over-deck envelope calculation based on simulation of helicopter shipboard operations

JI Honglei1,2, ZHAO Hui3, CHEN Renliang2, WU Wentao2

1. 1. College of Aerospace Engineering, Chongqing University, Chongqing 400030, China;
2. National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Systems Engineering Research Institute, Beijing 100094, China
• Received:2018-03-23 Revised:2018-06-06 Online:2018-11-15 Published:2018-06-15
• Supported by:
National Natural Science Foundation of China (11672128); the Fundamental Research Funds for the Central Universities (2018CDXYHK0016)

Abstract: This paper presents a Wind-Over-Deck (WOD) envelope calculation method by simulation of helicopter shipboard operations. Impacts of ship airwake, helicopter motions, and pilot controls are all taken into consideration to improve the accuracy of WOD envelope calculation. First, based on the flight dynamics model coupling with unsteady ship airwake, a pilot model is developed for helicopter maneuvering requiring multi-axis controls. Then, the mathematical description and generation algorithms of the classical helicopter shipboard flight trajectories are proposed. Finally, a dynamic simulation method for helicopter shipboard operations is obtained considering the impacts of ship airwake, helicopter motions and pilot controls comprehensively. Based on the simulation results of helicopter shipboard operations, the rejection criteria for WOD envelope calculation are summarized, and a calculation method of WOD envelope is developed. The calculated results show that the impacts of the ship airwake along the shipboard launching and recovery trajectories on helicopter flight states and pilot controls are greater than those above the landing spots in some WOD conditions. The proposed method can capture the impacts of the temporal and spatial variations of ship airwake above different landing spots and along different flight trajectories. In comparison with the traditional WOD calculation method, the proposed method significantly can improve the accuracy of WOD calculation.

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