Hi, i have a signal (wave form) as a amplitude varying over distance on rail track, i have to input this signal to my mass-spring-damper system which in my case replaces subsystem(​soil),ball​ast,sleepe​rs.

i have signal in the form of amplitude vs distance, with a constant mass and vertical velocity of 1m/s.

but i want to import this to simulink. i tried importing this a excel file, but how to do it if i have real siganls which varies every time, moreover i can able to give values only as variation over time but i have distance in my hand

this is to test the physical system which i created in simpack.