Structural Non-Probabilistic Reliability Analysis of Plunger Assembly
The plunger assembly in a certain type of fuel injection pump is prone to jamming,which leads to significant safety risks during the operation of the diesel engine.By modeling the plunger assembly and analyzing its working principle,this paper identifies the key parts that cause the jamming.At the same time,through the finite element analysis,it is found that the cause of the failure is the structural deformation of the plunger assembly under the working condition.A structural non-probabilistic reliability model of plunger assembly is established based on interval analysis method in this paper.Then the neural network is used to construct the performance function,and the reliability index η is calculated by genetic algorithm.The results show that when the clearance fit is 3 μm,the corresponding η of the original design is 0.97393,and the structure may fail.When the gap is changed to 3.5 μm,the η increases to 2.3391,which indicates that the structure is safe,and its non-probabilistic reliability is greatly improved.The conclusion provides valuable insights for the design of plunger assembly.
plunger assemblyfinite element analysisnon-probabilistic reliabilityinterval analysis
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