RANDOM VIBRATION OF A ROTATING BLADE WITH EXTERNAL AND INTERNAL DAMPING BY THE FINITE ELEMENT METHOD

✍ Scribed by C.-L. CHEN; L.-W. CHEN

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 238 KB
• Volume: 252
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.3674

✦ Synopsis

The "nite element model is employed to investigate the mean-square response of a rotating blade with external and internal damping under stationary or non-stationary random excitation. The blade is considered to be subjected to white-noise and earthquake excitations. The e!ects of rotational speed, external and internal damping on the meansquare response are studied. It is found that the mean-square response decreases quickly when the external and internal damping increases within some scope. Moreover, the increment of rotational speed will reduce the mean-square response of a rotating blade. It is also found that the mean-square response decreases when the low natural frequency of base decreases. Inversely, the mean-square response increases when the high natural frequency of base (natural frequencies of base are over the "rst natural frequency of blade) decreases. The reliability of a rotating blade subjected to stationary or non-stationary excitations is also obtained. 2002 Published by Elsevier Science Ltd. * * d , ¹" * * d d #S E * * d d #S * * d .