The attitude control problem of a rigid satellite with actuator failure uncertainties and external disturbance is addressed using adaptive control method.
The adaptive control system is analyzed, to show its desired stability and asymptotic tracking properties in the presence of actuator failure uncertainties.
Closed-loop signal boundedness and asymptotic output tracking, despite the actuator failure uncertainties, are ensured analytically and verified by simulation results from its application to attitude control of a near space vehicle dynamic model.
The parameters of external disturbance and failure uncertainties are estimated directly by adaptive laws, and the desired stability and output tracking properties of the adaptive control system are analyzed.
However, dependability is able to include, explicitly, the failures, uncertainties, hazards, etc. as far as their corresponding knowledge.
The problem is that we've reached a point of market failure and uncertainty.
Ancient philosophers and spiritual teachers understood the need to balance the positive with the negative, optimism with pessimism, a striving for success and security with an openness to failure and uncertainty.
Again, as predicted, the daily group-average cortisol level correlated nicely with this measure of market volatility.The upshot is that financial traders seem less stressed by failure than uncertainty.
At the root of this failure is uncertainty about how the burden of a bail-out should be shared between an LCFI's home country and its foreign hosts, where it may have lots of business.Some regulators are beginning to admit the problem.
The component failure rate uncertainty is taken under consideration and it is modeled with two alternative probability distribution functions.
Table 7 Consequence impact of failure and uncertainty interval ( U ) Computer Cushion PLC Interval [0.96 to 0.96] [0.81 to 0.91] [0.93 to 1] U 1-2 Negligible-Main Main-Critical Negligible-Main.
