Tracks without ballast for underground lines in urban centres. Determination of dynamic properties of rubber baseplate assemblies. Track and structures memorandum no.88 (TN-TAS-088)

The tests were devised to enable the dynamic properties of various types of base-plates to be determined at frequencies in the acoustic range up to 1 KHZ. The dynamic excitation was provided by an electro-magnetic vibrator while the baseplate was subjected to realistic static loads. A direct measurement of...