An eigenvalue analysis of a 10-car train model was conducted using NX Nastran, and the natural frequencies up to 20 Hz were obtained.
**Case Overview**
■Product Name: NX Nastran
■Analysis: Modal Analysis
■Industry: Railways and Shipping
Since railway vehicles operate in a coupled manner, it is necessary to analyze the motion characteristics of the entire train when considering vehicle dynamics. To accurately predict the vibrations generated in various parts of the moving vehicle, a vehicle simulation using a finite element model (FEM) that closely resembles the actual structure, rather than a uniform beam or equivalent plate structure, is required. On the other hand, such analyses heavily depend on the computational environment, model creation, and result visualization capabilities, necessitating parallel computing solutions and efficient pre/post-processing software. This example involves creating the vehicle body using Femap and conducting a modal analysis of a 10-car train model with NX Nastran to determine the natural frequencies up to 20 Hz. Additionally, the application of FEMAP and GLView for post-processing large-scale finite element analyses will be introduced.
![[Example] Large-scale finite element analysis of train vehicle dynamics](https://image.www.ipros.com/public/product/image/369/2000006072/IPROS77845660593761458.JPG?w=280&h=280)
