Ch2-3(4-5)c - 1 1 MAE351 Mechanical Vibrations Lecture 8...

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Unformatted text preview: 1 1 MAE351 Mechanical Vibrations Lecture 8 (Chap. 2.4-2.5) 2 Section 5.2 Isolation (extension of Sec. 2.4) A major job of vibration engineers is to isolate systems from vibration disturbances or vice versa versa. Uses material heavily from Sections 2.4 on Base Excitation 2 3 Isolation: sdof concept Two types: moving base and fixed base Three magnitude plots to consider TR used to Three magnitude plots to consider TR used to denote the transmissibility ratio X Y 1 (2 r ) 2 (1 r 2 ) 2 (2 r ) 2 F 1 2 2 Moving base, displacement TR F T kY r 2 1 (2 r ) (1 r 2 ) 2 (2 r ) 2 F T F 1 (2 r ) 2 (1 r 2 ) 2 (2 r ) 2 Moving base, force TR Fixed base, force TR = 4 Moving base vs. fixed base/Displ. vs. force 10 20 30 40 Y (dB) =0.01 =0.1 =0.3 =0.7 F (dB) X/Y = F T /F Moving base, Displacement TR j t F e m k x(t) c base y(t) 0.5 1 1.5 2 2.5 3-20-10 Frequency ratio r X/ 20 30 40 B) =0.01 =0.1=0....
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Ch2-3(4-5)c - 1 1 MAE351 Mechanical Vibrations Lecture 8...

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