The commercial operation of the maglev train has strict requirements for reliability and safety suspension control system. However, due to a large number unmodeled dynamics system, it is difficult obtain precise mathematical model After system been operated long time with high load, will change wear, aging failure components, as well settlement line track. performance degraded. Therefore, this ...

We present two new techniques for the inversion of first-arrival times to estimate velocity structure. These travel-time inversion techniques are unique in that they do not require the calculation of ray paths. First-arrival times are calculated using a finite-difference scheme that iteratively solves the eikonal equations for the position of the wavefront. The first inversion technique is a di...

efficiency of numerical methods is an important problem in dynamic nonlinear analyses. it is possible to use of numerical methods such as beta-newmark in order to investigate the structural response behavior of the dynamic systems under random sea wave loads but because of necessity to analysis the offshore systems for extensive time to fatigue study it is important to use of simple stable meth...