VIBRATION CHARACTERISTICS OF SYSTEMS WITH MULTIPLE BLADES

✍ Scribed by G.X. Ren; Z.C. Zheng; W.J. Wang

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 188 KB
• Volume: 225
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1999.2109

✦ Synopsis

An interesting phenomenon can be observed when the state-space dynamic substructural method is applied to the eigenproblem of bladed disk±shaft systems: whether or not the shaft is ¯exible, each frequency of the single root-®xed blade appears as a frequency of the whole structure with a multiplicity of at least (n À 3), where n is the number of repetitive blades. The presented result can be regarded as an extension of previous ®ndings by the authors in the sense that the commonly interfaced repetitive substructures are allowed to be treated as a rigid body in modal analysis. The defectiveness issue of the multiple eigenvalues arising from the repetitive substructures is also addressed. Examples of rotary wing models and a simpli®ed turbine model are presented for validation together with attempting their physical explanations.