基于有限元的多转子串联轴系扭转振动特性分析

以石化行业中典型三机组为对象,采用有限元方法分析了多转子串联轴系扭转振动特性.应用Dyrobes软件,采用积木式建模思想,构建了典型三机组扭转振动有限元实体模型,并分析了轴系扭转振动的Campbell图以及临界转速与振型等特性,结果表明多转子串联轴系的扭转共振临界转速点有效地避开了工作转速的±10%,以及二倍频与各阶临界转速的交点均不在工作转速安全裕值范围内,符合API工程标准.该方法建模简单、直观,可为多转子串联轴系转子的设计及机组安全运行提供理论及技术支持.

The method of multi-rotor tandem shafting torsional vibration characteristic analysis based on the finite element

Taking the typical three units multi-rotor tandem shafting in petrochemical industry as an example, the method of finite element was used to analyse the torsional vibration characteristic of multi-rotor tandem shafting. By the Dyrobes and the idea of brick pattern, the typical model, that was three units multi-rotor tandem shafting entity model was established, then the Cambell drawing, critical speed and vibration mode of multi-rotor tandem shafting were analysed. Results show that the torsional resonance critical speed point avoid effectively ±10% of the working speed, and the intersections of double frequency and all the critical speeds are beyond the scope of work speed safety margin, which comply with the API engineering standards. The modeling is simple and intuitive, together, the research provide theoretical and technical support for the design of multi-rotor tandem shafting and safe operation of the unit shaft rotor.