Health Monitoring System for the SSME-fault detection algorithms

<title>Time-frequency distributions for propulsion-system diagnostics</title>

“…A particularly useful, and intuitively appealing, approach for constructing TFD's is through its relationship with the ambiguity function [10] , [1 1] If the temporal and spectral correlation functions are defined by R(t, T) = s(t + T/2)s*(t r/2) and c(v, f) = 5(1 + ii/2)S*(f _ v/2), respectively, then the WVD is given by1 W(t, 1) = f R(t, r)e2'dr (1) = I c(V, f)ei2r(dzi. (2) Note that the spectral correlation function, (v, 1) is simply the double Fourier transform of the temporal correlation function, R(t, r). Similarly, the complex ambiguity function (CAF) is defined as…”

Review of Launch Vehicle Engine PHM Technology and Analysis Methods Research

“…The launch vehicle's engine, however, is an incredibly sensitive and prone component of the launch vehicle system failure due to its high technical complexity and difficulty in balancing the requirements of large thrust, high specific impulse, high thrust-to-weight ratio, long operation in the harsh environment of space, and the ability to withstand significant vibration and shock loads. In order to increase the dependability and safety of next space launch missions, research into Prognostics and Health Management (PHM) technologies for the new generation of intelligent launch vehicle engine systems has become necessary [2][3][4][5][6].…”