Abstract
More than 30 years ago, A. H. Vincent of Westland Helicopters demonstrated that if a structure is excited harmonically at a fixed frequency, the response at another position will trace a circle in the complex plane as a result of a stiffness modification between two points. This can be more generally expressed in the following manner. The structural or acoustical response at any position will map a circle in the complex plane for any straight line impedance modification in the complex plane. This article reviews the basis for this little-known principle and illustrates its usefulness for vibro-acoustics problems. The principle is demonstrated for noise radiation from a cantilevered plate and operator equipment cab. The technique can also be applied to waveguides.
| Original language | English |
|---|---|
| Pages | 6-9 |
| Number of pages | 4 |
| Volume | 45 |
| No | 10 |
| Specialist publication | Sound and Vibration |
| State | Published - Oct 2011 |
ASJC Scopus subject areas
- Safety, Risk, Reliability and Quality
- Acoustics and Ultrasonics
- Mechanical Engineering