Critical speeds and natural frequencies of rim-type composite-material flywheels

Technical Report · Fri Sep 01 04:00:00 EDT 1978

OSTI ID:6550802

Bert, C W; Chen, T L.C.; Kocay, C A

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.

• Research Organization: Oklahoma Univ., Norman (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 6550802
• Report Number(s): SAND-78-7049
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250500 -- Energy Storage-- Flywheels
33 ADVANCED PROPULSION SYSTEMS
330400 -- Advanced Propulsion Systems-- Hybrid Systems
330500* -- Advanced Propulsion Systems-- Flywheel Propulsion
AUTOMOBILES
COMPOSITE MATERIALS
FLYWHEELS
HYBRID SYSTEMS
MECHANICAL ENERGY STORAGE EQUIPMENT
MECHANICAL VIBRATIONS
MOTION
PERFORMANCE TESTING
ROTATION
TESTING
VEHICLES