Modelling for couplings of an airframe—propulsion integrated hypersonic vehicle with engine safety boundaries

Abstract

A model for coupled dynamics of an airframe-propulsion integrated hypersonic airbreathing flight vehicle with various engine safety boundaries, called HIT-HAV (Harbin Institute of Technology), was developed to analyse the couplings among flight dynamics, aerodynamics, propulsion, and control. These engine safety boundaries included inlet unstart boundary, burner wall temperature limitation, burner lean fuel combustion boundary, rich fuel combustion boundary, and so on. All these engine safety boundaries were considered in modelling the HIT-HAV. The validity and practicability of the model were verified by comparing with a full-scale generic hypersonic vehicle. By simulating the HIT-HAV model, the conclusion was drawn that due to the couplings among flight dynamics, aerodynamics, propulsion, and control, the airframepropulsion integrated hypersonic air-breathing flight vehicle may operate, beside the normal operation mode, near some safety boundaries and may even exceed them, which may cause a failure flight. A hypersonic air-breathing flight vehicle's un-safety operation mode could be avoided by limiting the fuel supply, which has been verified in simulations. This paper indicates that for an airframe-propulsion integrated hypersonic air-breathing flight vehicle with various engine safety boundaries, as there were various relevant operation modes requested by various engine safety boundaries, an independent flight control and propulsion control in the traditional sense would fail to satisfy the hypersonic air-breathing flight and hence a multi-mode control design should be the focus of future research.

Strictly-lower-convex-function-constructing disturbance observer based adaptive back stepping control for hypersonic flight vehicles

“…According to aerodynamic principles, [4][5][6]30 thrust, drag, lift, and pitching moment can be expressed by equations (7), (8), (9), and (10), respectively…”

“…Combining equations (5) to (8), (11) to (12), and (15) to (16), the strict feedback formed velocity subsystem can be written as (26)…”

“…It is a pity that, the HFV system presents several disadvantageous characteristics, such as multi-variables, nonlinearities, and couplings. 5,6 Apart from this, dynamics of the HFV are always affected by the serious external disturbances during the entire flight due to the complicated flight environment, 7 which leads to great challenges in controller designing.…”

Prediction of dynamic derivatives for air-breathing hypersonic vehicle using a harmonic balance method

“…The hypersonic airframe-propulsion integrative vehicle technology is a hotspot within the aerospace community and a number of investigators have contributed to its configuration design. [1][2][3][4][5][6][7] Due to the more complex exterior configuration and motion mechanism as well as higher flow nonlinearity and unsteadiness compared with the traditional aircraft, the dynamic characteristics analysis of the airbreathing hypersonic vehicle has been increasingly essential in the aircraft design. When it comes to this issue, dynamic derivatives are key parameters for the attitude control system design, vehicle trajectory set, and dynamic stability analysis.…”

Fast sliding mode control on air-breathing hypersonic vehicles with transient response analysis

“…American NASA research centre proposed a non-linear longitudinal model for the single-stage-to-orbit AHV with the conical wing configuration. 5 Yao et al 6 developed an integrated model for the AHV with various engine safety boundaries. Various non-linear control approaches have been applied to the AHV field based on these developed non-linear AHV models.…”