Reliability enhancement testing(RET) is an accelerated testing which hastens the performance degradation process to surface its inherent defects of design and manufacture. It is an important hypothesis that the degrad...Reliability enhancement testing(RET) is an accelerated testing which hastens the performance degradation process to surface its inherent defects of design and manufacture. It is an important hypothesis that the degradation mechanism of the RET is the same as the one of the normal stress condition. In order to check the consistency of two mechanisms, we conduct two enhancement tests with a missile servo system as an object of the study, and preprocess two sets of test data to establish the accelerated degradation models regarding the temperature change rate that is assumed to be the main applied stress of the servo system during the natural storage. Based on the accelerated degradation models and natural storage profile of the servo system, we provide and demonstrate a procedure to check the consistency of two mechanisms by checking the correlation and difference of two sets of degradation data. The results indicate that the two degradation mechanisms are significantly consistent with each other.展开更多
针对目前强化试验剖面效率低、成本高的问题,提出了某型弹类电子产品温度强化试验剖面设计框架。结合产品可靠性框图对试验对象进行失效逻辑分析,基于元器件降额的步长设计方法(step design method based on component derating,CD-SDM...针对目前强化试验剖面效率低、成本高的问题,提出了某型弹类电子产品温度强化试验剖面设计框架。结合产品可靠性框图对试验对象进行失效逻辑分析,基于元器件降额的步长设计方法(step design method based on component derating,CD-SDM)优化步长、缩短试验时间,采用基于有限元仿真的确定性分析方法获得工作极限和破坏极限估值,降低步长划分时极限间工作裕度的影响,实现步长、试验时间和其他要素的优化。以某型弹类电子产品高温步进为例验证所提方法,结果表明获得的温度强化试验剖面较传统方法在试验时间上最少可缩短13.33%左右,与传统方法相比减少了1/4的检测次数,优化了目前可靠性强化试验剖面设计对弹类电子产品试验效率低、成本高的问题。展开更多
Ramming system is the key device to guarantee the firing speed of self-propelled gun. Based on traditional reliability enhancement testing method, a new kind of reliability enhancement testing simulation method of ram...Ramming system is the key device to guarantee the firing speed of self-propelled gun. Based on traditional reliability enhancement testing method, a new kind of reliability enhancement testing simulation method of ramming system is put forward firstly. In CAD software Pro/E and dynamic simulation software ADAMS, the virtual prototype of ramming system is established. In EASY5 software, the corresponding hydraulic system and control system models are built. The reliability enhancement testing virtual environment of ramming system is developed using the mechanical-electrical-hydraulic co-simulation technology. Based on the load spectra provided by virtual prototype, and the stress distribution provided by finite element analysis and material's S-N curve(S is fatigue strength, N is fatigue life), a model of fatigue enhancement coefficient is established through the failure mechanism analysis. The simulation processes and simulation results show the feasibility of reliability enhancement testing based on virtual prototype, and provide sufficient theory reference for structure improvement and optimization of ramming system.展开更多
基金supported by the Natural Science Foundation of Hunan Province(2018JJ2282)
文摘Reliability enhancement testing(RET) is an accelerated testing which hastens the performance degradation process to surface its inherent defects of design and manufacture. It is an important hypothesis that the degradation mechanism of the RET is the same as the one of the normal stress condition. In order to check the consistency of two mechanisms, we conduct two enhancement tests with a missile servo system as an object of the study, and preprocess two sets of test data to establish the accelerated degradation models regarding the temperature change rate that is assumed to be the main applied stress of the servo system during the natural storage. Based on the accelerated degradation models and natural storage profile of the servo system, we provide and demonstrate a procedure to check the consistency of two mechanisms by checking the correlation and difference of two sets of degradation data. The results indicate that the two degradation mechanisms are significantly consistent with each other.
文摘针对目前强化试验剖面效率低、成本高的问题,提出了某型弹类电子产品温度强化试验剖面设计框架。结合产品可靠性框图对试验对象进行失效逻辑分析,基于元器件降额的步长设计方法(step design method based on component derating,CD-SDM)优化步长、缩短试验时间,采用基于有限元仿真的确定性分析方法获得工作极限和破坏极限估值,降低步长划分时极限间工作裕度的影响,实现步长、试验时间和其他要素的优化。以某型弹类电子产品高温步进为例验证所提方法,结果表明获得的温度强化试验剖面较传统方法在试验时间上最少可缩短13.33%左右,与传统方法相比减少了1/4的检测次数,优化了目前可靠性强化试验剖面设计对弹类电子产品试验效率低、成本高的问题。
基金the National Natural Science Foundation of China(No.51175508)
文摘Ramming system is the key device to guarantee the firing speed of self-propelled gun. Based on traditional reliability enhancement testing method, a new kind of reliability enhancement testing simulation method of ramming system is put forward firstly. In CAD software Pro/E and dynamic simulation software ADAMS, the virtual prototype of ramming system is established. In EASY5 software, the corresponding hydraulic system and control system models are built. The reliability enhancement testing virtual environment of ramming system is developed using the mechanical-electrical-hydraulic co-simulation technology. Based on the load spectra provided by virtual prototype, and the stress distribution provided by finite element analysis and material's S-N curve(S is fatigue strength, N is fatigue life), a model of fatigue enhancement coefficient is established through the failure mechanism analysis. The simulation processes and simulation results show the feasibility of reliability enhancement testing based on virtual prototype, and provide sufficient theory reference for structure improvement and optimization of ramming system.
