Abstract
The impact of temperature effect on exhaust manifold modal analysis is analyzed in this study. Firstly, the temperature field is mapped from the CFD software and then heat conduction process is analyzed in FEM software with the temperature field boundary conditions. At last the modal analysis that considers temperature effect is done. The frequency and vibration mode between cold modal and thermal modal’s are compared. The result shows that temperature has a great influence on the manifold mode and it is very valuable to product design.
Highlights
Modal analysis is used to study the inherent dynamic characteristics of a system
Because the thermal stress that tail gas heating caused can be as high as hundreds of Mpa, it can lead to thermal fatigue and cause structural fracture
The exhaust manifold mainly motivated by the road and engine, generally the road incentive is about 30 Hz and the engine inventive is more than 200 Hz, so the design frequency of exhaust manifold should be greater than 270 Hz. It can be seen by analyzing the results that the lowest order natural frequency of thermal modal analysis is 473.73 Hz and the cold modal’s lowest natural frequency is 1392.5 Hz, both meet the requirements to avoid the resonance between exhaust manifold and the engine or other parts
Summary
Modal analysis is used to study the inherent dynamic characteristics of a system. Natural frequency can show that the structure can produce resonance under some certain excitation frequency. A variety of researches have been working on this area Such as Shi and Yang (2006) considering a flat plate as the object of research, the analyses of structural transient temperature field and characteristic of structural vibration are presented with the conditions of thermal load. Their calculation results show that transient heating has a serious effect on the characteristic of structural natural vibration. Take the temperature field result of heat conduction analysis as load and combine with the temperature changed material physical properties and mechanical performance parameters to solve structure thermal stress. Take the thermal stress result as initial stress condition and consider the heterogeneity of temperature field, combine with the temperature varied material physical and mechanical properties (density, elastic modulus, coefficient of linear expansion and Poisson's ratio), to solve the structure thermal mode
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