An Alternative Solution of Train-Track Dynamic Interaction

Table 4

Evaluations of computational accuracy and calculation time of different methods.

Method	Computational accuracy		Calculation time
	Description	Level	Description	Level
A	To write vibration equations, complicated structures are simplified in large extent; moreover, inapparent mistakes in the written codes are difficult to find out	Middle	Compiled programs are highly efficient in solving TTI	Fast
B	Rail random irregularity is hard to be accurately considered	Low	Computational efficiency is low due to the implicit integration algorithm in FE software	Slow
C	Nonlinear characteristics of tracks and foundations cannot be considered	Middle	Adopting the algorithm of multibody dynamics and mode superposition method or modal synthesis method, computational efficiency can be ensured	Middle
D	Due to the changes of mass stiffness matrices, nonlinear properties of substructures cannot be considered	Middle	Compiled programs are highly efficient in solving TTI	Fast
Proposed method	Disadvantages of the above methods are settled	High	Hybrid explicit-implicit integration method is adopted to efficiently solve TTI	Middle