3/15/2023 0 Comments Tilt rotor flight control systemRemoving pilots dramatically increases payload and reduces personnel costs. The unmanned aerial vehicles (UAV) have been flying since the 1970s, and the safety record has been continuously improving. The urban airspace would have to look at safety factors, social aspects, system and aircraft issues. There is the need to understand the landscape of relevant questions surrounding the implementation of UAM. The UAM vehicle could either be rotary-wing, fixed-wing or hybrid cruise vehicles. Passenger acceptance and potential passengers' value of time are the two key factors for going ahead. Many companies are developing the next generation VTOL vehicles. On 2 March 2022, the US Federal Aviation Administration (FAA) issued draft interim guidance, to support the design and operation of facilities that electric VTOL aircraft will use for initial operations. It would mean designating routes along the main city arteries and developing new vertiports. Looking toward the future, the agencies are evolving infrastructure specially designed for UAM. The initial UAM ecosystem will use existing helicopter infrastructure such as routes, helipads, and Air Traffic Control (ATC) services. It will envisage commercial inter-city travel (like air taxis), cargo delivery, public services, and private or recreational vehicles. UAM will be composed of an ecosystem that considers the evolution and safety of the aircraft, the framework for operation, access to airspace, infrastructure development, and community engagement. ![]() UAM envisions a safe and efficient aviation transportation system that will use highly automated aircraft that will operate and transport passengers or cargo at lower altitudes within urban and suburban areas. ![]() Tilt-rotor systems have been tried and tested and will support regional connectivity till 300 km. Advances in battery and electric propulsion technology, and Vertical Take-Off and Landing (VTOL) design have supported Urban Air Mobility (UAM) and now given a flip. For a long time, there have been helicopter services from airports to city centres. A dual-objective control design approach demonstrates the effectiveness of suppressing both loads and flapping simultaneously.In 2020, Dubai passed a new regulation “to help flying taxis and drone deliveries to take off” alongside a network of mini-airports within the city. However, rotor flapping transients tend to increase by the action of the SLA system. ![]() Multi-variable control law design methods are used to develop controller schemes and load suppression of 80-90% is demonstrated using rotor cyclic control, albeit at a 20-30% performance penalty. The primary focus of attention is the suppression of in-plane rotor yoke loads for pitch manoeuvres in airplane mode without suppression these loads would result in a very high level of fatigue damage. The paper addresses the modelling aspects in some detail hence forming the foundation for both the FLIGHTLAB simulated XV-15 and EUROTILT configurations. The importance of and the need for SLA in tiltrotors are discussed, drawing on previous US experience reported in the open literature. This paper presents the first results from research into active control of structural load alleviation (SLA) for tiltrotor aircraft carried out in the European ‘critical technology’ RHILP project.
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