Comparison of two finite element approaches for analysis of rotating bladed-disk assemblies

• Published in: Journal of sound and vibration 1995-04, Vol.182 (1), p.91-107
• Main Authors: Hsieh, S.-H., Abel, J.F.
• Format: Article
• Language: English
• Subjects: Applied sciences; Continuous cycle engines: steam and gas turbines, jet engines; Engines and turbines; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Mechanical engineering. Machine design; Physics; Solid mechanics; Structural and continuum mechanics; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); Vibrations and mechanical waves
• ISSN: 0022-460X; 1095-8568
• DOI: 10.1006/jsvi.1995.0184

Two finite element approaches are implemented to account for the rotational non-linearities involved in dynamic analysis of rotating bladed-disk assemblies: the distributed mass (DM) and lumped mass (LM) approaches. The DM approach treats the structure as a continuum with mass points uniformly distributed in the structure, while the LM approach treats the structure as a collection of discrete concentrated mass points. These two approaches are used here exclusively for considering rotational effects in the dynamic analysis and should not be confused with the consistent and lumped mass approaches for representing the mass matrix. It has been found that the analysis results obtained using the DM and LM approaches are in close agreement for test problems studied. In addition, for transient analysis using explicit time integration, the LM approach has been found to be significantly more efficient than the DM approach.