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This paper derives an approximate discrete-time model for a nonlinear 3-DOF (degree-of-freedom) tandem-rotor model helicopter in the case of the multirate input and hold, which is accurate to some order in the sampling period. More importantly, the proposed model has more accurate than the classic Euler approximation. We also show how a particular strategy can be used to approximate the system outputs...
This paper is concerned with the stability of zeros of the discrete-time multivariable system composed of a generalized sample hold function (GSHF), a continuous-time plant with the degrees of infinite elementary divisors being two or three, and a sampler in cascade. The properties of the limiting zeros are studied and the conditions for ensuring the stability of the limiting zeros of the discrete-time...
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