The modal analysis of the wheel is done using the software ANSYS. Calculate the wheel mobility and the vibration velocity spectrum of the wheel and rail is calculated.
运用ANSYS对车轮进行了模态分析，求得车轮导纳以及钢轨和车轮振动速度的功率谱。
2
Compared to wire line networks, wireless networks have higher mobility, while they face the difficulty of bad wireless communication environment and limited spectrum resource.
相对有线网络，无线网络最大的优点是可移动性，但是却要面对恶劣无线通信环境和有限频谱资源的挑战。
3
However, the mobility effect, unreliable wireless channel condition and limited available wireless spectrum resources are the bottleneck for large traffic transmission.