CRITICAL SPEEDS AND NATURAL FREQUENCIES OF RIM-TYPE COMPOSITE-MATERIAL FLYWHEELS

Results of an analytical investigation conducted on a 0.56-kWh composite-material flywheel energy-storage system for application in hybrid automotive vehicles are reported. The investigation calculated the critical speeds and natural frequencies of a rim-type flywheel which is flexibly mounted on a finite hub, which in turn, is attached to an elastic shaft. The specific modes covered include whirling, torsional, and axial modes involving band, shaft and support flexibilities and in-plane bending, combined out-of-plane bending/twisting, and extensional modes of the flywheel rim. Where appropriate, gyroscopic and transverse shear effects are included. The two-mass, four-degree-of-freedom analysis presented here for the whirling modes including gyroscopic effects is believed to be the first such analysis appropriate for flywheels, as opposed to steam or gas turbines. The flexible rim analyses are believed to be the first to include the simultaneous effects of support stiffness, preload, transverse shear deformation and centrifugal action. Special attention is given to phenomena occurring during acceleration through critical speeds and to the effect of creep stress relaxation on the supporting bands.

  • Corporate Authors:

    University of Oklahoma, Norman

    660 Parrington Oval
    Norman, OK  United States  73019-0390

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Bert, C W
    • Chen, TLC
    • Kocay, C A
  • Publication Date: 1978-9

Media Info

  • Pagination: 111 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00192182
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: EY-76-C-04-0789
  • Files: TRIS
  • Created Date: Jul 11 1979 12:00AM