共查询到18条相似文献,搜索用时 156 毫秒
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同一产品用在不同的两个平台上能否同时满足这两个平台的使用要求,将两个平台结合起来进行可靠性增长试验设计可以回答这个问题,并且有利于节约经费,减少时间成本。该电子产品在平台A和平台B任务不同,可靠度非常接近。在剖面设计过程中,关于两个平台的温度、湿度、电应力的设计在相同的,振动应力将两个平台结合起来设计,振动应力取结合任务时间内在两个平台上的振动极大值包络。当增长模型未知,总试验时间采用指数分布的定时截尾方案。采用QJ3217-2000中没有增长模型的可靠性增长试验方法对试验结果的可靠性下限进行评估。最后对于多平台应用的产品,将多个平台结合起来进行可靠性增长摸底试验是可行的,符合我国的国情,易于被设计师接受。 相似文献
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随着长寿命和高可靠性特点产品的可靠性评估问题的日益突出,为了缩短可靠性评估时间、节省评估经费,加速寿命试验已成为主要发展方向。本文在不考虑综合环境干涉关系的基础上给出不同影响因素下的可靠性快速评估试验方案制定和选择优化过程,为后期快速选择可靠性评估方案提供依据。最后以某电子组件为例说明方案选择优化和分析过程。 相似文献
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可靠性强化试验在某产品上的应用 总被引:1,自引:0,他引:1
首先介绍可靠性强化试验的基本概念和产品情况,接下来分析了可靠性强化试验的流程、敏感环境应力及试验剖面的设计。介绍了某产品的可靠性强化试验,对试验结果进行分析,并提出了改进建议。最后对可靠性强化试验的相关问题进行总结和展望。 相似文献
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Validation of a hybrid life-cycle inventory analysis method 总被引:2,自引:0,他引:2
Crawford RH 《Journal of environmental management》2008,88(3):496-506
The life-cycle inventory analysis step of a life-cycle assessment (LCA) may currently suffer from several limitations, mainly concerned with the use of incomplete and unreliable data sources and methods of assessment. Many past LCA studies have used traditional inventory analysis methods, namely process analysis and input-output analysis. More recently, hybrid inventory analysis methods have been developed, combining these two traditional methods in an attempt to minimise their limitations. In light of recent improvements, these hybrid methods need to be compared and validated, as these too have been considered to have several limitations. This paper evaluates a recently developed hybrid inventory analysis method which aims to improve the limitations of previous methods. It was found that the truncation associated with process analysis can be up to 87%, reflecting the considerable shortcomings in the quantity of process data currently available. Capital inputs were found to account for up to 22% of the total inputs to a particular product. These findings suggest that current best-practice methods are sufficiently accurate for most typical applications, but this is heavily dependent upon data quality and availability. The use of input-output data assists in improving the system boundary completeness of life-cycle inventories. However, the use of input-output analysis alone does not always provide an accurate model for replacing process data. Further improvements in the quantity of process data currently available are needed to increase the reliability of life-cycle inventories. 相似文献
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Duong Minh Bui Phuc Duy Le Minh Tien Cao Trang Thi Pham Duy Anh Pham 《International Journal of Green Energy》2020,17(7):382-406
ABSTRACTTime-series and machine-learning methods are being strongly exploited to improve the accuracy of short-term load forecasting (STLF) results. In developing countries, power consumption behaviors could be suddenly changed by different customers, e.g. industrial customers, residential customers, so the load-demand dataset is often unstable. Therefore, reliability assessment of the load-demand dataset is obviously necessary for STLF models. Hence, this paper proposes a novel and unified statistical data-filtering method with the best confidence interval to eliminate unexpected noises/outliers of the input dataset before performing various short-term load forecasting models. This proposed novel data-filtering method, so-called the data pre-processing method, is also compared to other existing data-filtering methods (e.g. Kalman filter, Density-Based Spatial Clustering of Applications with Noise, Wavelet transform, and Singular Spectrum Analysis). By using an SCADA system?-based database of a typical 22kV distribution network in Vietnam, NYISO database, and PJM-RTO database, case studies of short-term load forecasting have been conducted with a conventional ARIMA model, an ANN forecasting model, an LSTM-RNN model, an LSTM-CNN combined model, a deep auto-encoder (DAE) network, a Wavenet-based model, a Wavenet and LSTM hybrid model, and a Wavelet Neural Network (WNN) model, which are to validate the novel and unified statistical data-filtering method proposed. The achieved numerical results demonstrate which the accuracy of the aforementioned STLF models can be significantly improved due to the proposed statistical data-filtering method with the best confidence interval of the input load dataset. The proposed statistical data-filtering method can considerably outperform the existing data-filtering methods. 相似文献
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大型复杂电子系统电子元器件选用与管理方法研究 总被引:1,自引:0,他引:1
电子元器件是组成电子系统的最小单元,电子元器件的选用与管理是电子系统设计中最关键的一步,也是系统质量和可靠性的基础。本文从电子元器件管理架构、电子元器件的优选以及进口电子元器件的选用控制等方面提出了一套大型复杂电子系统电子元器件选用与管理方法,以加强和规范系统电子元器件的管理和选用,提高大型复杂电子系统的质量和可靠性。 相似文献
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可靠性试验评价技术发展及其应用 总被引:3,自引:0,他引:3
本文介绍了可靠性试验评价的概况和技术发展,论述了可靠性仿真试验、可靠性强化试验、可靠性加速试验、系统可靠性试验、加速退化试验和可靠性综合评价的概念、方法、基本流程及其主要应用。 相似文献
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This study aimed at establishing an economic evaluation model to encourage continuing improvement in performance analysis and applying for any infrastructure system of urban recycled water. A thorough study towards characterization and economic performance assessment of urban water reuse scheme were carried out. An integrated evaluation technique was developed by synthesizing the quantitative and qualitative performance indicators related to the water recycled technology and urban water cycle system. Specific performance indicators and indexes were aggregated into an economic analytical modelling for effective evaluation of the water reuse scheme and technology using uniform economic performance standards. Detailed economic analyses were successfully applied to enable determination of economic lifetime of the technology and the whole water reuse scheme. This research confirmed that productivity, efficiency and reliability measurements and factors could be successfully deployed for determining the scheme performance during various life cycle stages (e.g. design development, operational and functional verification, or comparison with other reuse projects). The economic assessment model was applied to improve uniformity of analytical process and performance measure. This article demonstrates benefits associated with the application of a standardized methodology for performing economic assessment and by maintaining strong correlation between multi-parameter approach and adopted performance criteria in terms of productivity, efficiency and reliability. However, to ensure effectiveness of this assessment, the process would require systematic and perpetual inventory of the scheme performance data, consideration of variable factors such as capital and recurrent costs. 相似文献
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本文提出了应用模糊积分进行大气环境质量综合评价的具体方法和步骤,并用这一方法进行大气环境质量评价,取得了令人满意的结果。该方法的优点是简便实用,评价结果可靠。 相似文献