The online quality control method for reassembly based on state space model.

The online quality control for reassembly (remanufacturing assembly) process is one of the key technologies to ensure the quality of reassembly influenced by uncertain, nonlinear and dynamic environment. According to the characteristics of reassembly process, this paper constructs the state space model which takes assembly operation and part attributes as the input vector, work-in-process as the state vector, and assembly quality as the output vector. Then, a transfer function for assembly quality is established, which is used to characterize the coupling mechanism of assembly error. Furthermore, considering the uncertainty of remanufactured parts, the modified operation index for reassembly workstation is calculated. On the basis of the studies above, the online quality control method of reassembly is put forward by the grading method. Finally, the online quality control method for the axial clearance and gyroscopic moment of remanufactured crankshaft is studied. The results of the case study indicate that the methods can improve the reassembly precision. [ABSTRACT FROM AUTHOR]