Freely available reference designs are provided to give customers a head start on designing their own system and help reduce the time needed to move a motor control system from concept to production.
免费提供的参考设计提供给客户一个良好的开端在设计自己的系统，并有助于减少到电机控制系统移动从概念到生产所需的时间。
This paper presents a method for modifying the designing structural parameters of a bridge structure so that the bridge structure will freely vibrates at prescribed frequencies and modes.
本文研究了修改桥梁结构设计参数，使其自振周期和振型满足预先给定设计要求的动力特性修改过问题，提出了一种求解方法。
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