本论文写的是臂架型的。
臂架型起重机：可在圆形场地及其上空作业，多用于露天装卸及安装等工作。
Jib crane: in circles over the operation site and more for open-air handling and installation work.
为解决第3代206kp型转向架定位臂在运用中的疲劳破坏问题，提出了2种改进方案。
Two improvement schemes are put forward to solve the problem of fatigue damage in operation of the positioning arms for the 3 ~ (rd) generation 206kp bogies.
它作为臂架型起重机械的安全保护装置具有一系列优点。
It provides a series of advantages for use as a safety device of boom type cranes.
当箱型臂截面设计合理且在危险截面处实施局部补强后，可使臂架具有良好的刚度，强度，振动稳定性。
When the box section design boom and a reasonable cross-section are put in danger of partial reinforcement, the arm can have good stiffness, strength, vibration stability.
因此臂架需要有一定的侧向刚度以保证其振动稳定性，即要求箱型截面形状设计合理。
Therefore need to have a certain arm lateral stiffness to ensure stability of the vibration, which would require the box shape of the design of a reasonable cross-section.
通过模态分析发现，浮吊结构的振型主要表现为主钩钢丝绳-吊重系统摆动和臂架振动，振动频率都很低；
Through the modal analysis, it is found that main vibration modes of floating crane structure are swing of rope-load system and vibration of boom, and the vibration frequencies are low;
通过模态分析发现，浮吊结构的振型主要表现为主钩钢丝绳-吊重系统摆动和臂架振动，振动频率都很低；
Through the modal analysis, it is found that main vibration modes of floating crane structure are swing of rope-load system and vibration of boom, and the vibration frequencies are low;
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