Study On Structure Performance And Optimization Of Diesel Particulate Filter

With the widely application of the diesel engine, in view of the emissions of the diesel engine, the diesel particulate filter has come into being; the research on it has also deepened the new extension. The structure of the diesel particulate filter is complex, it bears great structural load and thermal load in practical application. It is installed on the diesel engine exhaust system, has been affected by the random load during the running process. At present, the research on the structural performance of DPF in practical working condition is relatively less. So by using the effective simulation method to analysis the structural performance of DPF and predict its fatigue life. The analysis results for the fatigue design decision have a certain guiding significance.Firstly, based on the finite element analysis method, using the ABAQUS software as the tool, the structural strength of DPF has been analyzed in five typical load conditions. The stress value of the bracket on DPF is higher, but not more than the corresponding yield strength of the material.Secondly, based on the statics analysis of DPF in five load conditions, the fatigue life analysis of DPF has been done. DPF can achieve unlimited service life in general conditions, the limited service life of DPF in the poor condition of the bad road form can reach 200,000 cycles.Then, DPF in actual working conditions bears a certain thermal load. The thermal stress distribution and thermal fatigue life of DPF have been calculated under given temperature load of 250?,650?,1000?. Under the high temperature load of 1000?, the service life of DPF has been calculated, it can reach 600,000 cycles. Based on the fluid-structure coupling, the boundary conditions of fluid analysis are obtained through simulation used GT. The thermal stress distribution and thermal fatigue life of DPF considering fluid-structure coupling have been analyzed. If the fatigue safety coefficient be expressed in the form of fatigue strength, the safety coefficient is 1.2.Finally, the modal analysis of diesel engine exhaust system with a DPF has been carried out. Based on the ADDOFD theory, the ideal hanging positions of the whole system have been selected. Then the corresponding validation analyses have proved that the selected hanging positions are reasonable. The random vibration analysis of the whole system has been carried out. Then using the theory of three interval method to calculate the random fatigue of the whole system. The calculation results show that the overall damage coefficient is less than 1. Which indicates that when the DPF is arranged on the diesel exhaust system and the suitable hanging positions have been selected, the whole system has good fatigue durability.This paper has carried out the study of structural strength, fatigue life, thermal stress distribution on DPF, which has important significance for understanding the structural performance of the DPF. At the same time, it has laid the theoretical foundation for the application of DPF on the diesel engine.