Research On Life-cycle Quality Consistency Design Of Aerospace Electromagnetic Relay

Quality consistency problems with an electronic component in service have become a major cause of repeated satellite,rocket,and missile launch delay and operational accidents.Aerospace electromagnetic relay(AER)is the worst of the electronic components in terms of life-cycle consistency and is the shortest of the shortboard.How to select the key and give quantitative improvement requirements so that the rate of degradation and degradation fluctuations of the product quality characteristics of batch manufactured relays can be There is no answer to this question.The fundamental reason for this is that,on the one hand,no model of key component degradation describes the quantitative relationship between key component performance parameters and life-cycle consistency,and on the other hand,there is no effective means of quantitatively evaluating and designing relays for life-cycle consistency based on this model.To address these issues,this paper investigates the life-cycle consistency evaluation and design of AERs considering the influence of various uncertainties.Firstly,a method for modeling and characterizing the microscopic degradation and macroscopic performance parameters of key components of AER is proposed.The degradation failure mode and degradation mechanism of the study object are determined by the test.At the same time,the failure mechanism and the underlying key degradation components are determined from the suction-reaction fit.The microscopic magnetic domain,domain wall,and strong magnetic phase α1 aging evolution of permanent magnet(PM)are analyzed.A model of magnetic irreversible degradation in the form of logarithmic decay function of PM is established.The material transfer mechanism under the metal-liquid bridge during contact and anode-cathode arcing are analyzed through experiment.A contact pair Wiener degradation model was established to reveal the contact pair surface morphology evolution law.By analyzing the degradation mechanism of dislocation and slip microscopic motion of elastic reed under the action of the high cycle,the Wiener degradation model considering test error is established.The above degradation model lays the foundation for life-cycle consistency evaluation and design of AER.An AER life-cycle digital model is established,a quantitative analysis method considering various uncertainties is proposed,and a quantitative evaluation of the life-cycle consistency is achieved through degradation data fusion.Analyzing the working principle of AER,establishing the digital model of life-cycle based on actual measurement data,and realizing accurate calculation of their static and dynamic characteristics.Analyze the characteristics of various uncertainties,at the same time a non-probabilistic method and sequential statistical method are proposed.The evolution of life-cycle consistency law is analyzed,initial moment distribution information and consistency evaluation model were established,which provide a basis for life-cycle consistency design.A global multi-objective optimal parameter design method for life-cycle consistency is proposed to achieve a significant improvement in quality robustness without changing the manufacturing process.The method is based on the evaluation of a large number of samples for the life-cycle consistency of relays and the need for efficiency in the calculation of quality characteristics,and the introduction of real and time-varying characteristics into the alternative modeling process to achieve high accuracy and rapid calculation of static and dynamic characteristics.A global multi-objective parameter design method based on time-varying non-linearity and quality feature degradation compensation is proposed based on component degradation models,uncertainty quantification,and time-varying non-linear parameter screening results,using improved population evolution strategies,variation strategies,and adaptive differential evolution(DE)algorithms for control parameters.The optimal nominal combination of design parameters is determined using an improved population evolution strategy,a variational strategy,and a DE algorithm for the control parameters.Based on the determination of the best nominal combinations of design parameters,an adaptive design method is proposed for the life-cycle consistency tolerance of relays considering the manufacturing process,quality loss cost,and manufacturing feasibility to achieve the synergistic control of relay life-cycle degradation rate and degradation fluctuation.The method is based on an adaptive contribution margin redistribution method that considers the contribution margin variation due to uncertainty range,manufacturing process cost,life-cycle quality loss cost,and manufacturing feasibility,and establishes a tolerance design objective function.This will significantly improve the life-cycle consistency without significantly increasing the manufacturing cost,and develop corresponding measurement and control devices for weak processes to improve the feasibility of the tolerance allocation scheme.