Dynamic Simulation Research On Coupling Fault Of Reciprocating Compressor Transmission Mechanism

Reciprocating compressors are essential equipment for gas compression and transportation work.As the drive mechanism is subjected to complex alternating loads during operation,it is prone to wear,which in turn affects the mechanical characteristics of the connecting rod small head mating position and leads to small cracks in the stress concentration area of the small head shank.If failures are not detected in time,these failures may lead to the failure of the connecting rod work,which in extreme cases can lead to serious production accidents.At present,the reciprocating compressor fault diagnosis and analysis mainly rely on vibration signal detection,but the complex internal structure of the reciprocating compressor,many sources of excitation,resulting in the connecting rod coupling fault signal is difficult to separate from other signals generated during the operation of the compressor and work noise,various reasons lead to the establishment of the reciprocating compressor coupling fault database faces multiple difficulties,both to spend a lot of time and money,but also to consider These factors limit the experiments and result in insufficient fault data.Therefore,this paper proposes to use dynamics simulation to simulate the conditions of reciprocating compressors under coupled fault conditions,to obtain their vibration response curves during operation,and to study their fault mechanisms.A compact dynamics model of the reciprocating compressor with rigid-flexible coupling is constructed.After constructing the simplified 3D model of the reciprocating compressor,the flexibility of key components is completed by accurate meshing in the flexibility processing stage,and the modal non-response components are removed on this basis.The resulting rigidflexible coupled dynamics model has high dynamics simulation efficiency and ensures the accuracy of simulation results.The kinetic simulation of wear gap and fatigue crack failure at the small head shaft of the reciprocating compressor connecting rod was carried out to explore the failure mechanism of a single failure.The wear gap failure and fatigue crack failure at the connecting rod shim were simulated in the simulation stage by increasing the radius parameter and slotting method,and the contact force changes at the connecting rod shim under different fault conditions were analyzed,and it was concluded that the wear gap failure mainly affects the impact characteristics and the fatigue crack failure mainly affects the interference components.A coupled fault simulation of wear gap and fatigue cracking at the small head shank of a reciprocating compressor connecting rod was carried out to explore the fault mechanism of a reciprocating compressor containing coupled faults.Using the control variable method,the influence laws of the input speed magnitude,wear gap and fatigue crack severity on the overall signal characteristic components are sought in the fault mechanism exploration stage of the coupled fault,respectively.The results show that the input rotational speed mainly affects the shock component,while it has little effect on the disturbance component,while the variations of the gap width and crack depth correspond to the severity of the shock intensity and the disturbance component of the signal,respectively.