Reliability Degradation Analysis of Actuator Reciprocating Seal
The reciprocating seal of the actuator will inevitably wear out during service,which will affect the perform-ance of the seal.According to the mixed lubrication state of the sealing interface,the sealing performance of the reciproca-ting seal of the actuator was analyzed by fluid-structure coupling method.Based on Rhee wear theory,the wear formula of seal ring was established,and the wear condition of seal lip during reciprocating motion was analyzed.The stress distribu-tion,contact pressure distribution and leakage rate of sealing ring with wear time were simulated.Considering the influence of the dimensional tolerance of the sealing ring structure on the sealing performance,the response surface method was used to fit the relationship between the leakage rate and the structure size,and the leakage rate distribution and reliability under the condition of non-wear were obtained.The reliability degradation model considering the influence of wear on the reliabil-ity was established,and the degradation trend of reliability after wear,and the service life of the seal were obtained.The re-search results show that the sensitivity of VL sealing structure size on leakage rate,in descending order,is height,width,air inclination angle,oil inclination angle,and diameter.By directly using leakage rate as an evaluation indicator,the sealing reliability of VL seals during service can be predicted.
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