Modelica-based Object-orient Modeling of Rotor System with Multi-Faults

摘要

Modelica-based object-orient method is proved to be rapid,accurate and easy to modify,which is suitable for prototype modeling and simulation of rotor system,whose parameters need to be modified frequently.Classical non-object-orient method appears to be inefficient because the code is difficult to modify and reuse.An adequate library for object-orient modeling of rotor system with multi-faults is established,a comparison with non-object-orient method on Jeffcott rotor system and a case study on turbo expander with multi-faults are implemented.The relative tolerance between object-orient method and non-object-orient is less than 0.03%,which proves that these two methods are as accurate as each other.Object-orient modeling and simulation is implemented on turbo expander with crack,rub-impact,pedestal looseness and multi-faults simultaneously.It can be conclude from the case study that when acting on compress side of turbo expander separately,expand wheel is not influenced greatly by crack fault,the existence of rub-impact fault forces expand wheel into quasi-periodic motion and the orbit of expand wheel is deformed and enhanced almost 1.5 times due to pedestal looseness.When acting simultaneously,multi-faults cannot be totally decomposed but can be diagnosed from the feature of vibration.Object-orient method can enhance the efficiency of modeling and simulation of rotor system with multi-faults,which provides an efficient method on prototype modeling and simulation.