Domain

Explanation

Contents

1. Intro: need for vibration, criteria & levels
2. Harmonic responses
3. Receptance & dynamic stiffness: frequency domain, modal, transfer matrices & four-pole parameters
4. Responses of structures to prescribed harmonic motions
5. Non-harmonic responses
6. Beam & plate vibrations
7. Control by structural design
8. Control by localized additions: neutralizer, suppressor
9. Control by added damping: materials, stiffeners for resonant vibrations
10. Control by resilient isolation: @ sources, isolation, dynamic absorbers
11. Combined methods: power transmissibility, adding/modifying auxiliary systems

General methods

• De-tuning: adding masses or stiffnesses; for resonant vibrations
• Reducing the number of responding modes
• Nodalizing: varying locations, sources, geometry for vibration node
• De-coupling: changing of participating modes
• Structural stiffening
• Optimizing the structural geometry
• Selecting the best material(s)
• Localized additions: auxiliary dynamic absorbers & analysis of the total system response at point R with load at S & auxiliary system at A
• Damping systems for resonant vibrations with high-damping materials & distributed damping
• Resilient isolation of vibration of receiver from source through interconnecting isolation system: works for high frequencies
• Combined methods: for vibrations so severe & broadband that only combinations would suffice; use of specific vibration control criteria à power transmissibility, dynamic stiffness, receptance & neutralization