Spring finds better resonance
An
Abssac product story
Edited by the Engineeringtalk editorial team
Dec 22, 2005
Spring design saves time and money on common twin engine turbo-prop commuter aircraft.
On a common twin engine turbo-prop commuter aircraft, a fuel control system used a ground end wire wound compression spring.
Two problems existed with this wound product.
The wound spring and surrounding assembly required servicing after 50 hours of use, and the spring had its first mode frequency excited (resonance) at normal engine running speeds.
The resonance resulted in a side to side motion of the spring which caused wear to the diaphragm surrounding the spring.
The airline industry wanted an assembly with a longer service life.
By using a machined spring product from Abssac, an alternative spring design was developed to fit within the same physical design.
The alternative spring geometry exhibited its first mode excitation frequencies outside that of normal engine speeds.
Additionally, the machined spring could incorporate some of the spring system's additional mechanical structures into the single part.
The new machined spring let existing service intervals be extended by 10 times, although tests suggested that 100 times may be possible.
The fact that the spring incorporated some of the separate parts of the spring system meant that the manufacturer of the fuel system not only had a more reliable part, but could also save time and cost during procurement.
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