Evaluation of temperature effect on modal analysis for exhaust manifold

The effect of the temperature on exhaust manifold modal analysis was investigated in this study. For doing this, Solidworks software was used to model the exhaust manifolds. Then the modal analysis was performed to get the natural frequencies in Abaqus software.  Finally, the modal analysis that considers temperature effect was done. The study of structural dynamics is essential for understanding and evaluating the performance of any engineering product. The determination of the dynamic characteristics of automotive structures has become an extremely important issue in the automobile industry. Modal Analysis is currently one of the key technologies in structural dynamics analysis. The temperature-dependent of material parameters was considered in order to increase the accuracy of finite element analysis (FEA) results. The results of FEA proved a very good agreement between temperature distribution and thermal analysis results, carried out in references. The frequency and vibration mode between cold modal and thermal modal’s was compared. The results showed that temperature has a great influence on the exhaust manifold mode and it is very valuable to product design. The results of the modal analysis proved that the maximum strain energy density and total strain energy exist in the confluence area. The results of the finite element analysis correspond with the experimental tests, carried out in references, and illustrate the exhaust manifold cracked in this region. The obtained FEA results show that gas pressure is effective on the modal analysis and must be considered in the modal analysis of exhaust manifold.