Heating of Polyurethane Shock Absorber in Cyclic Loading

摘要

An empirical formula is derived for the temperature of polyurethane shock absorbers of different hardness in cyclic loading as a function of the compressive strain, loading frequency, and vibrational amplitude. Shock absorbers are widely used in manufacturing to decrease the amplitude of cyclic (periodic) or pulsed (impact) forced vibrations in unbalanced steady systems. Modern shock absorbers are based on a vibrationally isolating mass. The material employed depends on the expected life of the shock absorber. Recently, the traditional material, rubber, has been gradually replaced by polyurethane elastomers, with benefits such as longevity and resistance to aging and aggressive media. In addition, polyurethane elastomers are characterized by high strength, elasticity, and a fairly large range of working temperatures: from -35 to 75°C [1-3].