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

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
3 5 6 Ex. 5.1.2 Comparison between a stereo turntable and a car m =1000 kg k =400,000 N/m =1 kg =400 N/m c =8 Ns/m =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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 7 But response magnitudes different (see Fig 5.3) • Magnitude plot has the same shape
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/11/2010 for the course MECHANICAL ms316 taught by Professor Abduljaba during the Spring '09 term at Kalamazoo.

Page1 / 12

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

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online