基于ANSYS Workbench的高扬程多级离心泵转子模态分析

多级离心泵因效率高、扬程大而应用广泛，但结构复杂，运行时，转子高速旋转，易引发振动产生破坏，影响安全运行。利用ANSYS Workbench协同仿真软件对多级离心泵转子进行模态分析，获得前十阶固有频率及振型。研究转子系统的振动特性，考察叶轮级数对模态的影响，分析预测叶轮级数变化引起振动的可能性。结果表明：D型五级离心泵在给定工况下振动特性良好，不会发生共振。增加叶轮级数，引发共振的可能性增加，应避开易引发共振的转速区间运行。分析结果为转子系统的振动故障诊断和预测、动力特性优化设计、动力学分析奠定理论基础，对减小振动、避免共振、安全稳定运行等具有重要意义。

英文摘要:

The multistage centrifugal pump is widely applied because of its high effectiveness and lift. However, it also has several disadvantages, namely complex structure, and high-speed rotation of rotor during operation which can easily induce vibration, conduct damage and influence the safety operation. Employing ANSYS Workbench, together with simulation software, to conduct modal analysis toward the rotor of multistage centrifugal pump, so as to gain the intrinsic frequency and vibration model of the first ten steps. Researching the vibration characteristics of rotor system, examining the influence of impeller progression on the modal, as well as analyzing and anticipating the possibility of that impeller progression change induces vibration. The results show that: the D-type five-progression centrifugal pump has good vibration characteristics but no resonance under give operation condition. The increase of impeller progression will increase the possibility of inducting resonance that the operation shall keep away from the rotate speed range which can easily induce resonance. The analysis results lay theoretical foundation for the vibration fault diagnosis and anticipation of rotor system, optimization design of dynamic characteristics as well as dynamics, and have significant meanings toward decreasing vibration, avoiding resonance as well as keeping safety and stable operation.

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