Rotor Control Equivalent Turbulence Input (RCETI) models

Abstract

This paper presents a first step toward the generalization of the hover/low-speed Control Equivalent Turbulence Inputs (CETI) models for different helicopter configurations. The rotor hub-loads are used as the outputs to which the turbulence-related spectra are matched in order to achieve this. Furthermore, the rotor swash-plate deflections are considered as inputs to create what is referred to herein as the Rotor Control Equivalent Turbulence Inputs (RCETI) model. Development of an RCETI model, that provides rotor loads spectra similar to those produced by vertical turbulence, is carried out using a representative model of the UH-60 helicopter in FLIGHTLAB®. The effect of altering the rotor parameters on the RCETI model is studied and presented in the paper.