Ch5-1(1-2)c - 1 MAE351 Mechanical Vibrations Lecture...

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1 1 MAE351 Mechanical Vibrations Lecture 21 (Chap. 5.1-5.2) 2 Chapter 5 Design for Vibration Suppression Acceptable vibration levels Vibration isolation Effects of damping in absorbers • Optimization Visco-elastic damping treatments Critical speeds of rotating disks Active vibration isolation Practical isolation design
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2 3 5.1 Acceptable Levels of Vibration Each part or system in a dynamic setting is required to pass “vibration” musters. Military standards, ISO, KS, SAE, ASTM, etc provide regulations and standards. Individual companies provide their own standards or design specifications. • Usually stated in terms of amplitude Usually stated in terms of amplitude, frequency, and duration of test. 4 Table 5.1 Ranges of frequency and displacement of vibration Frequency Displacement (Hz) (m) Atomic Vibration 10 12 10 -10 Human Perception Machines & Buildings 10 – 100 10 -5 – 10 -3 Swaying of Tall Bldg. 1 – 5 10 -2 - 1
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3 5 6 Ex. 5.1.2 Comparison between a stereo turntable and a car m =1000 kg k =400,000 N/m m =1 kg k =400 N/m c =8 Ns/m 400,000 N/m c =8000 Ns/m car CD drive 400,000 20 rad/s 400 20 rad/s 2 1000 8000 0.2 2(1000)(20) 20 1 0.2 19.6 rad/s n d 2 1 8 0.2 2(1)(20) 20 1 0.2 19.6 rad/s n d
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