RESEARCH ON THE DYNAMICS OF BAND-SUPPORTED FLYWHEEL SYSTEMS. FINAL REPORT

This is the final report on primarily analytical research relating to various aspects of the dynamics of band-supported, composite-material-rim flywheel energy-storage systems for application in hybrid automotive vehicles. First, the report presents a program overview and summarizes the results described in detail in three previous reports on this same contract. Then, a parametric study is carried out for free whirling of a flywheel system with a flywheel shaft supported by ball bearings, typical of a class of configurations contemplated in vehicular application as distinguished from R and D spin tests. It is shown that for a wide range of combinations of hub location and bearing and shaft stiffnesses, it is possible to avoid having any potentially dangerous forward-precession critical speeds throughout the desired operating range of 8,000 to 32,000 rpm. Nonlinear analyses are presented to describe the behavior of the bands in both the translational and tilting modes. The primarily softening behavior is geometrically induced and can lead to buckling at relatively small amplitudes. The band behaviors are approximated by polynomial expansions and applied to analyses of the steady-state forced whirling response. An analysis is presented for the behavior of a ring-type containment system after failure of the bands. This analysis combines Hertzian impact theory with an analysis of ring response to a concentrated load of half-sine waveform. It is shown that a 1-inch-thick aramid-epoxy ring should provide satisfactory containment. Small model studies were initiated to study some of the nonlinear and containment phenomena. Preliminary results are encouraging.

  • Corporate Authors:

    University of Oklahoma, Norman

    School of Aerospace, Mechanical and Nuclear Engineering
    Norman, OK  United States  73069

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Bert, C W
    • Kocay, C A
    • Chen, TLC
    • Busby, J P
  • Publication Date: 1978-11

Media Info

  • Pagination: 61 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00198136
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: EY-76-C-04-0789
  • Files: TRIS
  • Created Date: Sep 15 1979 12:00AM