Optimal vertical takeoff and landing helicopter operation in one engine failure

Zhao, Yiyuan; Jhemi, Ali; Chen, Robert T. N.

doi:10.2514/3.46943

Cited by 21 publications

(5 citation statements)

References 10 publications

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“…When a helicopter is used in the military, it must be guaranteed that the helicopter can avoid threats in low altitude areas [16] and can deal with emergency when one engine fails. In Reference [17], the landing trajectory of a multiengine helicopter in the event of a single engine failure is generated using the optimal control method. Time derivatives of thrust coefficients are treated as control variables, and constraints on rotor speed and thrust vector are imposed.…”

Section: Literature Review and The Work Of This Papermentioning

confidence: 99%

Path Planning for Autonomous Landing of Helicopter on the Aircraft Carrier

et al. 2018

Mathematics

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Helicopters are introduced on the aircraft carrier to perform the tasks which are beyond the capability of fixed-wing aircraft. Unlike fixed-wing aircraft, the landing path of helicopters is not regulated and can be determined autonomously, and the path planning problem for autonomous landing of helicopters on the carrier is studied in this paper. To solve the problem, the returning flight is divided into two phases, that is, approaching the carrier and landing on the flight deck. The feature of each phase is depicted, and the conceptual model is built on this basis to provide a general frame and idea of solving the problem. In the established mathematical model, the path planning problem is formulated into an optimization problem, and the constraints are classified by the characteristics of the helicopter and the task requirements. The goal is to reduce the terminal position error and the impact between the helicopter and the flight deck. To obtain a reasonable landing path, a multiphase path planning algorithm with the pigeon inspired optimization (MPPIO) algorithm is proposed to adapt to the changing environment. Three experiments under different situations, that is, static carrier, only horizontal motion of carrier considered, and 3D motion of carrier considered, are conducted. The results demonstrate that the helicopters can all reach the ideal landing point with the reasonable path in different situations. The small terminal error and relatively vertical motion between the helicopter and the carrier ensure a precise and safe landing.

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Section: Literature Review and The Work Of This Papermentioning

confidence: 99%

Path Planning for Autonomous Landing of Helicopter on the Aircraft Carrier

et al. 2018

Mathematics

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“…(6), a first-order response is assumed for turboshaft engines (Ref. 6). In this case, it will simulate the decay in power following engine failure.…”

Section: Rotorcraft Modelmentioning

confidence: 99%

Evaluation of a Rotorcraft Autorotation Training Display on a Commercial Flight Training Device

Aponso¹,

Lee²,

Bachelder³

2007

j am helicopter soc

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This paper outlines the application of a real-time trajectory optimization method for rotorcraft autorotation training. Rotorcraft autorotation is a time-critical maneuver that allows very little margin for error in the timing and magnitude of the pilot's control inputs. Results of preliminary evaluations strongly indicate that successful autorotations may be performed from well within the unsafe operating area of the height-velocity profile of a helicopter by employing a fast and robust optimal algorithm that provides guidance on control inputs through an intuitive pilot display. The commanded control inputs generated by the optimal control formulation are collective and aircraft pitch, which are easily tracked by a pilot or can be converted to control actuator commands for automated operation during autorotation. The formulation of the optimal control problem was carefully tailored to emulate solutions resembling those of an expert pilot, accounting for the performance limitations of the rotorcraft, as well as safety concerns.

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“…The takeoff procedure is more tricky for the vehicle with heavy loads at a hostile area with rough terrain, high temperatures and high altitudes. With very little excess power, the only feasible way for the heavily loaded (HLD) helicopter is to perform a short takeoff using ground effect [14,15], as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Propeller control for takeoff of a heavily loaded coaxial compound helicopter

et al. 2023

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Although a coaxial compound helicopter can takeoff without propeller in the normal condition, the distance should be as short as possible for obstacle avoidance when the vehicle operates in a confined area with heavy loads. Therefore, a suitable propeller control is required to improve the takeoff performance while the total power consumption is no more than the available power. The path is predicted by applying trajectory optimisation. Several varying takeoff parameters, including attitude, liftoff speed and obstacle height, are considered for optimum global performance. Three path indicators are proposed. Apart from typical distance and pilot workload, path sensitivity is quantified based on deviation from takeoff parameter variation. Results indicated that low propeller thrust at hover and moderate allocation on the propeller through flight is recommended. The aircraft achieves significantly improved takeoff performance compared to flight with pure rotors while maintaining the maximum takeoff weight. The distance is shortened by 12.6%, and the longitudinal pilot workload is alleviated by 9.8% and 7.3% from mean and maximum power frequency aspects. Besides, the path is less sensitive to takeoff parameter variations, such as speed, altitude and height.

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Optimal vertical takeoff and landing helicopter operation in one engine failure

Cited by 21 publications

References 10 publications

Path Planning for Autonomous Landing of Helicopter on the Aircraft Carrier

Path Planning for Autonomous Landing of Helicopter on the Aircraft Carrier

Evaluation of a Rotorcraft Autorotation Training Display on a Commercial Flight Training Device

Propeller control for takeoff of a heavily loaded coaxial compound helicopter

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