# Please give explanations to the correct answer. Thank you very much in advance, will rate! Biogen Aeronautic Defence an...

###### Question:

Biogen Aeronautic Defence and Space Systems makes Biofuel-powered jet airplanes For their new model, the Bein' Green-17, they placed the greener jet forward of the wing; but, as its nacelle (or inlet cowl) generates lift at high angles of attack (such as those during take-off), it is necessary to compensate for the positive feedback mode this causes in the plane's pitch. Note, this is particularly the case when the air is a little thinner, such as at "hot or high" airports. Also, other design changes (a new inlet, larger landing gear, etc.) would be less fuel efficient and more costly.] In response, a control program is added to automatically pitch the nose down just before a stall (i.e. a condition in which lift is lost due to airflow separation at large angles of attack). This, in turn, requires an estimate of the airplane's angle of attack. Four engineers are debating what strategy to take to observe this value Engineer W suggests that median value from three of the same sensors is taken. . Engineer X suggests that only two of the most accurate and robust sensors are needed. Engineer X recommends a sensor that has an MTBF (mean time between failures) of 20,000 hours (2.2 years continuous operation) and to take the maximum value of the two sensors Engineer Y suggests state estimation of the value from different two different types of sensors (of which, at least one of each is needed, though more is nice). Engineer Y's initial suggestion is an Extended Kalman Filter, to get the average value (μ) and its variance (σ) · Engineer Z suggests an integrated Bayesian estimation and control strategy that considers the value,its likelihood, and the next controlled action, States would be conditioned on the sequence of flight motions, state of the overall flight (e.g., taxi, take-off, etc.), etc. Engineer Z adds that this approach is more robust and even allows for active-sensing (e.g. self-diagnosis and calibrating the sensor when on (presumably level) ground, etc.) Who (if any, some, or all) is right? Please discuss.

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