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Controller Requirements
The requirements for the stability and performance of fight control systems are specified in the certi-fication requirements for U.S. civilian aircraft, Federal Aviation Regulations (F.A.R.), Parts 23 and 25, and in the US military specifications MIL-F-8785C based on aircraft flying qualities (F.Q.s). For US Military aircraft the flying qualities are categorised by flying quality levels as described in Table 7.1. Requirements for damping ratios for the long-period and short-period modes are shown in Tables 7.2 and 7.3 respectively. Because the long-period is always a slow acting mode which gives the pilot plenty of time to control there is no specification on the natural frequencies required in this mode.The short period natural frequency however is a critically important parameter. The short period frequency requirements for accurate flight control are determined by the n : α ratio. Fig. 7.3) shows the regions of acceptable ωnSP vs the acceleration sensitivity nZα = n/α from MIL-F-8785C for a flight phase of Category B. To determine this ratio we consider the state-space equation of the short period approximation
x = Ax+Bu
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Degree of reaction measures the way compression or expansion (for turbines) is shared between rotor and stator shared between rotor and stator of a stage (stage ≡ rotor + stator)
Suppose you borrow $10,000 at 10% and you are going to make monthly payments of $2,500. How long until you pay off the loan?
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Convert the following reduced bearings to whole circle bearings: N.36°16’E; (b) S.28° 14’ E. (c) S.47°26’W and (d) N.58°24’W
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functions of offset
#include org 0xoo movlw 0x00 ---------- movlw 0xff movwf PORTB end
Aerospace propulsion is essentially based on Newton'slaws of motion (1687): • A body on which there is no resultant force will move ina straight line with constant velocity.
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