Sol_Test3 - Final slop is -20 (db/dec), the difference of...

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Final slop is -20 (db/dec), the difference of orders (Den.-Num.) is 1. Phase angles: +90 ± 0 ± -90. We have 1 “zeros” 2 “ploes”. Besides, the starting angle is +90, therefore, the “zeros” has “0” real part. From the peak and the arrow, we know the damping ratio is less than 0.707 and it is actually 1 . 0 2245 x (by comparing the arrow to the given reference plot). From 0 degree crossing (“+90” + “-90” crossing), we know 7 2245 n w (rad/sec). The Transfer Function should have the form as: + + 1 2 2 2 2 n n n S S S K w x w w . For n w w << = 1 . 0 , 2 2 2 2 7 2 . 0 7 1 log 20 ) log( 20 ) 7 log( 20 log 20 + - - + w w w K FRF ) ( 34 20 ) 7 log( 20 ) 1 log( 20 ) 1 . 0 log( 20 ) 7 log( 20 2 2 db K K - 2245 - - + 2245 8 . 9 ), ( 14 ) 7 log( 20 2 2245 - = K db K . 49
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Sol_Test3 - Final slop is -20 (db/dec), the difference of...

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