Method for acquiring vertical wheel-rail force of ballast track of high-speed railway in frequency domain

The invention discloses a method for acquiring vertical wheel-rail force of a ballast track of a high-speed railway in a frequency domain. The method comprises the following steps: dividing wheels into driving wheels and driven wheels; calculating the dynamic flexibility of the wheel in the frequency domain; calculating the dynamic flexibility of the steel rail in the frequency domain; acquiring the vertical displacement of the steel rail and the vertical displacement of the sleeper; obtaining the dynamic flexibility of the steel rail at the driving wheel; acquiring vertical wheel-rail contact force between the steel rail and the driving wheel and the vertical wheel-rail contact force between the steel rail and the driven wheel in the frequency domain; and sequentially taking each wheel as a driving wheel, and obtaining the vertical wheel-rail force of the ballast track according to the superposition principle based on the vertical wheel-rail contact force between the steel rail in the frequency domain and th