The total dynamic receptance is dominated by the dynamic receptance of the wheel before 40 Hz. When the frequency variesfrom 40 Hz to 135 Hz, both the wheel and rail dynamic receptancedetermine the total dynamic receptance. When the frequency varies from 135 Hz to 1000 Hz, the total dynamic receptance can beconsidered equivalent to the dynamic receptance of the rail; whenthe frequency exceeds 1000 Hz, it is mainly determined by thedynamic receptance of the contact spring.