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以门座起重机组合臂架系统为研究对象，用试验模态分析方法对臂架结构进行了测试分析，提出设计起重机时应注意：１）臂架结构的振动能量一般集中在前３阶模态内；２）臂架结构共振时其拎点处的振幅最大．
Taking the gantry crane combined boom system as the research object, the boom structure was tested and analyzed by the experimental modal analysis method. It is suggested that when designing the crane, 1) the vibration energy of the boom structure should be concentrated in the first 3 modes ; 2) When the boom structure of the maximum amplitude of its carry point.