Influence of Natural Vibration Frequencies in the Analysis on Vibration Resistance of Steel Supporting Parts of a Car

This article discusses the causes of pump bracket failure on a truck. The pump bracket attached to the vehicle frame. The bracket model developed in NX CAD. The analysis of the vibration strength calculation of the engine pump installation performed using the ABAQUS software package. Model preparation, and finite-element meshing is performed on the ANSA software product. The calculation carried out taking into account vibration. In this work, the tool HARMONIC RESPONSE and TRANSIENT ANALYSIS used to take into account vibration in modeling. Simulation results show ultimate loads of 10 MPa. A bracket model has been developed that can withstand the loads. In the process of real car operation, some brackets break down. To increase the accuracy of modeling, a block of data of the bracket's natural operating frequencies during the vehicle's movement has been prepared. The acceleration sensor on the bracket takes the data. The real data we get as result of repeated real road tests. The bracket simulated for vibration resistance taking into account natural motions. The simulation results show ultimate loads of 92 MPa. Vibration strength simulations of a pump bracket mounted on a car frame show a nine-fold difference in the stresses generated. The point of stress concentration changes its location. This shows that the natural frequencies of the engine pump in motion superimposed on the frequencies generated when the car is in motion. Resonance occurs as a result. Resonance produces loads that not anticipated in the simulation. In reality, the bracket collapses.