【摘要】 为分析两级离心泵叶轮偏心距激励突变时转子系统产生振动和冲击的机理,改进了将质量集中于叶轮的方法并建立了悬臂式两级离心泵转子系统动力学方程,得到了2个叶轮在不同方向振动量的无量纲化解析式,提出了无量纲化的偏心距效应系数,以判别不同叶轮偏心距激励突变对整个转子系统振动的影响,最后对叶轮偏心距激励突变时其弯曲振动特性和几何中心位移规律进行了分析。结果表明:与叶轮1偏心距激励突变相比,叶轮2偏心距激励突变对离心泵的影响更大;叶轮2偏心距激励突变对叶轮1的影响大于叶轮1偏心距激励突变对叶轮2的影响;相比偏心距激励突减,偏心距激励突增时超调量更大、对系统破坏性更强。更多还原

【Abstract】 To analyze the mechanism of vibration and shock of the rotor system in a two-stage centrifugal pump under the mutational eccentricity excitation, a method of focusing the mass only on impeller was improved and the dynamic equation of cantilever two-stage centrifugal pump rotor system was established. The dimensionless analytic formulas at different directions were obtained, and the dimensionless eccentricity effect coefficient was presented, which was used to distinguish the influence of excitation mutations of different impeller eccentricity on the vibration of the whole rotor system. Finally, the bending vibration characteristics and shaft center displacement law of the impeller with sudden change of eccentricity excitation were analyzed. Results show that the effects of eccentricity excitation mutation on the final impeller are greater than that on the first impeller. Moreover, the effects of the final impeller eccentricity excitation mutation on the first impeller are greater than that of the first impeller eccentricity excitation mutation on the final impeller. Compared with the sudden decrease of eccentricity excitation, the overshoot of sudden increase of eccentricity excitation is larger, and the damage to the system is stronger.更多还原