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2 Papacz W.

2 2009

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Basic dynamic parameters of composite leaf springs

Papacz W.

Journal of KONES

2009

Vol. 16, No. 1

379-385

In this paper research results of ability vibration's suppression steel and composite leaf springs were presented. Polymeric composite leaf springs and steel were studied. Composite leaf springs were made from epoxy-glass composite reinforcement by glass fibre. Composite springs became designed to can replace steel spring of van. Executed investigations base on dynamic loadings of leaf springs and registering of vibrations amplitude and reaction of props. Load was realized through lowering from definite height of mass which hit into spring wresting it from balance. Mass stayed on spring to total atrophy of vibrations. Measured and registered parameters permitted to count logarithmic decrement suppressions of tremblings and coefficient of suppression of tremblings. This coefficient was counted for composite and steel leaf springs. Basic exploational parameters of leaf springs were compared as well as basic advantages of applying to vehicles building of composite materials were analysed. Analyses lead to conclusion that composite leaf springs in comparison to steel springs: about three times better suppress of tremblings, they are about five times lighter and give smaller dynamic burdens of vehicles body. Wide applying of composites materials on carrying structures of vehicles will contribute to lower of vehicles mass and to decrease of emission greenhouses gases.

Some parameters of composite leaf springs

Papacz W.

International Journal of Applied Mechanics and Engineering

2009

Vol. 14, no 4

1181-1187

In this paper, results of research on vibration suppression in steel and composite leaf springs are presented. Polymeric composite leaf springs and steel springs are studied. Composite leaf springs were made of an epoxy-glass composite reinforced with glass fibre. Composite springs were designed in such a way that they could replace steel springs in a van. Static and dynamic examinations of both the springs were performed. The amplitude of vibrations and the reaction of props were measured and recorded. These parameters rendered it possible to calculate the logarithmic decrement of vibration suppression and the coefficient of vibration suppression for steel and composite leaf springs. The results are presented in tables and graphs. It is concluded that composite leaf springs in comparison to steel springs about three times better suppress vibrations , they are about five times lighter and generate smaller dynamic burdens to vehicle bodies.