PASSIVE VIBRATION CONTROL OF AIRBORNE EQUIPMENT USING A CIRCULAR STEEL RING

✍ Scribed by J. ELLISON; G. AHMADI; M. KEHOE

• Book ID: 102606461
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 489 KB
• Volume: 246
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2000.3116

✦ Synopsis

Vibration isolation is needed to protect avionics equipment from adverse aircraft vibration environments. Passive isolation is the simplest means to achieve this goal. The system used here consists of a circular steel ring with a lump mass on top and exposed to base excitation. Sinusoidal and "ltered zero-mean Gaussian white noise are used to excite the structure and the acceleration response spectra at the top of the ring are computed. An experiment is performed to identify the natural frequencies and modal damping of the circular ring. Comparison is made between the analytical and experimental results and good agreement is observed. The ring response is also evaluated with a concentrated mass attached to the top of the ring. The e!ectiveness of the ring in isolating the equipment from base excitation is studied. The acceleration response spectra of a single-degree-of-freedom (s.d.o.f.) system attached to the top of the ring are evaluated and the results are compared with those exposed directly to the base excitation. It is shown that a properly designed ring could e!ectively protect the avionics from possible damaging excitation levels.