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Tuesday, July 9 • 10:30 - 10:50
INFLUENCE OF TEMPERATURE ON PERFORMANCE OF CUP VIBRATION ISOLATION MOUNTS

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A series of static and dynamic vibration tests is performed on cup mount assembly at wide range of temperatures. The main purpose is to determine the influence of temperature on the effective stiffness of elastomer-based cup mounts. Typical effects of temperature on silicone rubber are not obvious for these isolators due to the hybrid design of the mount. The elastomer is vulcanized and bonded to the base cup and then pre-loaded when all three components; molded assembly, outer cup, and core are assembled into one-piece. Static load deflection tests and dynamic vibration tests at hot temperature showed that the cup mount had higher effective stiffness in all three directions (compression, tension, shear) than room temperature. The same tests at cold temperature showed much stiffer results in static testing, as expected, but softer results in dynamic testing. Part of the experiment focused on measuring components at hot and cold temperatures to determine how their dimensions changed when subjected to temperature variations. At hot temperature, rubber expansion was greater than the stainless outer cup expansion, giving itself a higher pre-load. The observed 10-15% increase in effective stiffness is due to the extra pre-load outweighing the softening of the elastomer due to increased temperature. At cold temperature, the rubber shrinkage was greater than the outer cup shrinkage causing the assembly pre-load to be lost, which explains the softer results in dynamic tests. Reviewing the load-deflection results at various temperatures showed these hybrid isolators are slightly stiffer at hotter temperatures and much stiffer at colder temperatures when a constant static load is applied. The small displacement dynamic tests show agreement at hot temperature, however at cold temperature isolators softened. These changes in effective stiffness due to temperature are factored in the elastomer cross section and need to be considered in the design of isolators

Moderators
avatar for Simon Jones

Simon Jones

Associate Professor, Rose-Hulman Institute of Technology
Professional interests include undergraduate engineering education, finite element modeling, ground-borne vibrations, vibrations of musical instruments, and dynamics of toys.
GM

Guilhem Michon

Professor, ISAE-SUPAERO

Authors

Tuesday July 9, 2019 10:30 - 10:50 EDT
St-Laurent 7
  T07 Struct. dyn. & nonlin. vib., RS03 Struct ac & vibr