Abstract
Within the problems solution of complex research in helicopter controllability, the reasons of changes controllability parameters when transporting cargo using external load have previously been identified. The next stage of research is to determine how concrete cargo parameters and external load as a whole, as well as their combination influence helicopter controllability parameters. The article contains research results of the cargo parameters and external load impact on static and dynamic controllability parameters. As a static characteristic of controllability the operation efficiency expressed by the maximal angular acceleration acquired by the helicopter in the case of throttle equal deviations at various flight velocities was considered. Time of the transient process was chosen as a dynamic characteristic with the observable parameter being the movement of the cyclic pitch. For cargo parameters, 16 combinations of ballistic coefficient and cargo mass were considered, while the external load parameter the cable length from 10 to 40 meters was chosen. According to completed simulation experiments, certain dependencies were found between controllability parameters and external cargo parameters and their various combinations. The analysis of the results showed that the dynamic characteristics are more appropriate for estimating the impact of cargo parameters on helicopter flying qualities, since such estimation fully defines the workload on a pilot. The acquired results may be applied to improve Flight Operations Manuals and Aviation Personnel Training Instructions.
Highlights
As a static characteristic of controllability the operation efficiency expressed by the maximal angular acceleration acquired by the helicopter in the case of throttle equal deviations at various flight velocities was considered
Time of the transient process was chosen as a dynamic characteristic with the observable parameter being the movement of the cyclic pitch
The analysis of the results showed that the dynamic characteristics are more appropriate for estimating the impact of cargo parameters on helicopter flying qualities, since such estimation fully defines the workload on a pilot
Summary
В рамках решения задач комплексного исследования управляемости вертолета ранее были определены причины изменения параметров управляемости вертолета при транспортировке груза на его внешней подвеске. Следующим этапом исследования является определение влияния конкретных параметров груза и внешней подвески в целом, а также их сочетания на характеристики управляемости вертолета. В статье представлены результаты исследования влияния параметров груза и внешней подвески в целом на статические и динамические показатели управляемости. При выполнении вертолетами воздушных перевозок и авиационных работ с использованием внешней подвески (ВП) груз оказывает влияние как на равновесие и балансировку, так и на управляемость вертолета, что значительно усложняет процесс пилотирования и увеличивает нагрузку на экипаж. Что причины изменения параметров управляемости вертолета при транспортировке груза на его ВП уже были определены ранее и описаны в работе [1], таким образом, данная статья является следующим этапом комплексного исследования управляемости вертолета с грузом на ВП
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