Research on the stress response characteristics of the crank-connecting rod mechanism under lubrication failure and auxiliary equipment malfunction

The dynamic behavior of crank-rod mechanisms has a significant impact on the stability and service life of engines. Lubrication failure and ancillary equipment failure may trigger a complex stress evolution process in the crank linkage, which in turn affects the dynamic response characteristics of the system. To address this issue, this paper constructs a computational model based on the kinetic theory and finite element method for lubrication failure and accessory equipment failure, and carries out the stress response analysis under the failure state. The results show that the local stress concentration phenomenon caused by lubrication failure increases significantly under low-speed conditions, while the stress gradient caused by lubrication failure slows down gradually with the increase of speed, and the overall stress distribution tends to be homogenized. The torque perturbation induced by the failure of ancillary equipment has less influence on the overall stress distribution of the crankshaft, but induces larger stress fluctuations in the local area of the free end. The research results can provide theoretical support and engineering guidance for the health monitoring, fault diagnosis, and structural optimization of the crank connecting rod mechanism.