Analysis Of The Vibration And Sealing Performance Of The Fuel Pipe System In An Armored Vehicle

The vibration sealing of the fuel pipeline system is one of the typical reliability problems of the armored vehicle,which is directly related to the reliability of the armored vehicles.For a long time,the design of the pipeline system,the assembly of the hose clamp and the installation of the grounding clamp mainly depend on the engineering experience,which is lack of scientific technical guidance.The sealing problem of the vibration of the pipeline system involves fluid-thermal-solid interaction,the problem of nonlinear material/geometric nonlinear/structural nonlinear,which contact mechanics and seepage problem,vibration fatigue and rubber aging,have very high academic research and engineering application value.In this paper,I take one specific fuel pipeline in a certain armored vehicle fuel pipeline system as a model to carry out the reliability analysis of vibration sealing.The specific research work includes the following aspects:(1)According to measured fuel line,the pipeline system is linearized,then established the finite element model of pipeline system.The natural frequencies and mode shapes of the pipeline system are respectively calculated in the two case of fluid medium and non-fluid medium.The results show that there is the same between the 8 modal characteristics of the fluid medium and the non-fluid medium pipeline system,and the mode shape is the form of the cluster;(2)By means of modal superposition method,completed the harmonic response analysis in the pipeline system,and completed the frequency sweep between 0-180 Hz,extracted the stress response and displacement response of the reference point.A new method to determine the weak frequency of the seal structure of the rubber hose clamp is put forward,and the spatial motion state of the three section of the rubber hose in the dangerous frequency is analyzed according to sweep frequency analysis result.(3)Using the method of sub-model,established three hose clamp fine finite element model,extracted the amplitude of displacement response of 3 reference points of hose clamp sealing structure in dangerous frequency in vibration loads,as hose clamp sealing structure finite element model of boundary conditions,calculate the sealing contact pressure of the torus.The calculation results show that the contact pressure of the sealing ring under the vibration load is lower than that under the assembly condition.(4)From two aspects of the frequency modulation and the decline of the pipeline system for dynamic optimization,analyzed the effect of constraint stiffness of grounding clamp,the number of grounding clamps and damping vibration isolator material parameters of pipe system modal and harmonic response of the;results show that the increase of constraint stiffness of grounding clamp and increased ground card clamp quantity can significantly improve the pipeline system of the modal frequencies,but still can't guarantee the low order modal frequency adjusted to sweep range;the reliability of vibration sealing of fuel line system is not sensitive to the seventh and eighth grounding clamps.adding damping vibration isolator,modal frequency is essentially the same,reference point of stress response and lower displacement response increases.