An experimental method of measuring the damping of a structure when subjected to a spatially-distributed random vibration

✍ Scribed by G.J. McNulty

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 473 KB
• Volume: 5
• Category: Article
• ISSN: 0003-682X
• DOI: 10.1016/0003-682x(72)90032-1

✦ Synopsis

The measurement of the modal damping of a structure when subjected to a spatiallydistributed random force, such as a turbulent boundary layer, can be achieved by cross correlating the excitation and response. In most practical cases it is difficult to monitor the boundary layer pressure field on the structure and a second exciting force must be introduced. In some cases also, limitations in space require that the excitation and the response measurements must be made at a single point.

The above considerations were incorporated by the experimental technique shown in Fig. 1 where the second exciting force is provided by a white noise