**4.2 Comparison of simulation results considering residual stress**

During operation of the main pump, the load acting on the cylinder block does not act as a cyclic symmetry, and the load distribution during rotation varies. Therefore, in this study, the time when the cylinder block receives the highest load during rotation is selected and analyzed (**Figure 22**). The reason for this is that the cylinder block will rotate and receive a load at this peak time periodically at the lowest stress (0 MPa).

The results of the residual stress analysis obtained above are mapped to the structural simulation model and the results shown in **Figure 23** can be obtained by using the above described simulation conditions and methods. It can be confirmed that there is a considerable difference by comparing it with the stress value of the simulation method which does not consider the residual stress (**Figure 24**).
