轴系法兰连接螺栓数量对振动的影响

法兰连接螺栓数量改变了轴系连接的刚度,从而影响轴系的振动。以某集装箱船推进轴系为研究对象,采用有限元仿真方法,通过改变艉轴和中间轴法兰连接的螺栓数量,分析其与轴系振动间的关系。研究结果表明:增加螺栓数量会增加轴系连接刚度,使轴系低阶固有频率增大,高阶固有频率减小;在发生共振时,靠近螺旋桨端节点的共振幅值较大,远离螺旋桨端节点的共振幅值较小。因而在选配螺栓数量时,应以控制螺旋桨端共振幅值为主;而增加螺栓数量会降低该处的共振幅值,但降低程度逐渐减弱。因此,在选配螺栓数量时,要综合考虑装拆等实际问题,并在规范允许的螺栓数量范围内进行适当调整。

The influence of the number of bolts on the shaft connection flange on the vibration

The number of connecting flange bolts changes the local stiffness of the shafting coupling, thereby changing the vibration mode of the shafting. In this paper, a container ship propulsion shafting system is taken as the research object. The finite element simulation method is used to analyze the influence of the number of bolts on the flange of the connecting shaft and the intermediate shaft. The analysis results show that increasing the number of bolts will increase the low-order natural frequency of the shafting system and decrease the high-order natural frequency. When resonance occurs, the common amplitude value near the propeller node is the largest, so it should be controlled when the number of bolts is selected. The common amplitude value is dominant at the node, and increasing the number of bolts will reduce the common amplitude value at the node, but the degree of reduction is gradually weakened. Therefore, when selecting the number of bolts, comprehensive problems such as installation and disassembly should be considered comprehensively, and the number of bolts cannot be blindly increased. .