Vibration analysis and optimization of the oil pan of a diesel engine
                                                              SHANG Qing，CHEN Zhenlei ，LI Jiancheng
                                      (Faculty of Maritime and Transportation, Ningbo University, Ningbo 315000, China)

Abstract: Aiming at the violent vibration problems experienced by the oil pan of a diesel engine, this paper intended to reduce the maximum vibration acceleration in the operation of the oil pan. The forced vibration analysis method was employed by combing the simulation analysis and the experimental test. First, the modal testing and finite element modal calculation of the whole machine, and the calibration analysis of them were performed. Therefore, a reliable simulation model of the oil pan was obtained. Then, the finite element based forced vibration analysis of the oil pan was conducted under the maximum torque condition of the diesel engine. Also, the calibration analysis of the vibration accelerations obtained by the numerical simulation and the experiment was accomplished. Last, based on the numerical results, the position of the large vibration acceleration encountered by the oil pan was obtained. Also, optimization analysis of the oil pan was performed. The results indicate that the structural stiffness of the oil pan can be improved by increasing the edge thickness and the stiffeners of the oil pan under the promise of cost control. Moreover, the maximum vertical acceleration of the oil pan after optimization is decreased by 12.8% from 85.0 m/s2 to 75.3 m/s2. Therefore, the violent vibration of the oil pan is effectively reduced in the operation of the oil pan.

Key words: modal analysis; experimental test; oil pan; forced vibration; vibration reduction optimization