共查询到18条相似文献,搜索用时 125 毫秒
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电磁干扰环境下产品失效机理分析 总被引:2,自引:0,他引:2
论述了电磁干扰环境对产品所产生的影响,阐述了在此环境下产品的失效模式,分析了在电磁干扰环境应力下产品功能失效的原因,指出了产品一般都会受到电磁波感应耦合、核电磁脉冲、静电失效、雷电电磁脉冲等干扰的影响作用,并针对性地提出了对产品进行有效防护的方法。 相似文献
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根据我国的实际情况,肯定了对雷达电子设备在湿热环境条件下进行通电工作的需要,分析了湿热环境对产品的影响,结合某雷达产品模拟湿热试验的实践,论证了模拟湿热环境通电工作的必要性和可行性,指出了在较低装配级别上进行通电试验,效果更理想。 相似文献
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根据机械工业环境技术“七五”规划和部下达的基金项目,1986年10月20~23日在广州召开了任务协调及成立工作组会议。具体内容包括: 1.机械工业产品环境分类和分级的研究; 2.湿热环境下使用的机械工业产品总技术要求的研究; 3.湿热带机电仪产品防护包装通用技术的研究。 机械部科技司、天津工程机械研究所、 相似文献
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温度影响造成产品的故障是各种环境中最多的,本文对温度环境下产品失效机理进行了分析,并针对性地提出了对产品进行有效防护的方法. 相似文献
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研究了机电一体化产品的数控系统的湿热使用环境条件及其对产品的影响,在此基础上,提出提高产品在湿热环境适应性方面的防护技术措施。 相似文献
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气相防锈剂在牵引电机制造过程中的应用 总被引:2,自引:0,他引:2
本文通过防锈性能试验(湿热试验)、防锈理化性能试验、实际验证试验研究了可剥离塑胶气雾剂(Y1)、气相防锈粉(Y2)、快干型防锈油(F1)以及气相防锈剂(F2)四种气相防锈剂对牵引电机产品材料的防锈效果,结果表明:Y1防锈效果好,但理化性能差;Y2不可长时间与明水接触,适用于短期防锈的产品;F1涂刷时应注意涂抹均匀,不可漏涂,适用于中短期防锈的产品;F2防锈效果最好,在高湿环境下防锈效果尤为突出,适用于长期防锈的产品。从而为牵引电机产品工序寻找出了合适的气相防锈剂,解决了牵引电机等产品制造工序中防锈需求问题。 相似文献
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本文简要介绍了环境与可靠性试验领域试验设备系列检定标准HB 6783、GB/T 5170。以本单位某型温湿度试验箱验收为例,详细介绍了HB 6783、GB/T 5170系列温湿度试验设备检定/检验标准在温湿度试验箱性能指标验收中的应用,通过对比应用总结,指出综合比较不同检定标准中温湿度性能指标的检定项目、方法,结合本单位产品试验需求应用,是制定温湿度试验箱性能指标验收方法的最佳途径。 相似文献
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有机涂层户外失效分析及对策 总被引:1,自引:0,他引:1
我国气候类型复杂,有机涂层在一些典型气候条件下经过一段时间的户外暴露后都会出现粉化、颜色变化、剥落、沾污等明显变化.综合起来分析,当地太阳辐射强度、辐射量、温湿度等是有机涂层失效的主要因素;同时空气中的污染物、沙尘等也加速了有机涂层失效.因此研制新型户外涂料时要确保有机涂层既能起防护作用,又能起装饰作用,以增强有机涂层... 相似文献
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本文介绍了环境试验方法、内容和应用范围,详细阐述了环境试验中环境应力引起的失效模式及其对塑料产品质量的影响。 相似文献
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Although moisture has a decisive role in the permanence of cellulose and unprinted paper, its role in ink release from the surface of printed recovered papers remains unclear. This work aimed to determine whether various relative humidity levels in the artificial aging test affect ink release from the surface of the paper and its fibers when pulping cold-set offset printed newspapers in alkaline pulping conditions. The results showed that relative humidity variations from 30% to 70% negligibly affected ink release at 60 °C. However, compared with these lower humidity levels, exposure to 90% relative humidity for at least 25 h resulted in a higher ink content bound to fibers, a greater formation of visible dirt specks after pulping and a smaller formation of microscopic ink particles. In practical applications, the accurate estimation of climate effects during the storage and the transportation of recycled papers requires that humidity conditions are taken into account while performing artificial aging tests with paper products. 相似文献
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Approximately 40% of annual demand for steel worldwide is used to replace products that have failed. With this percentage set to rise, extending the lifespan of steel in products presents a significant opportunity to reduce demand and thus decrease carbon dioxide emissions from steel production.This article presents a new, simplified framework with which to analyse product failure. When applied to the products that dominate steel use, this framework reveals that they are often replaced because a component/sub-assembly becomes degraded, inferior, unsuitable or worthless. In light of this, four products, which are representative of high steel content products in general, are analysed at the component level, determining steel mass and cost profiles over the lifespan of each product. The results show that the majority of the steel components are underexploited – still functioning when the product is discarded; in particular, the potential lifespan of the steel-rich structure is typically much greater than its actual lifespan. Twelve case studies, in which product or component life has been increased, are then presented. The resulting evidence is used to tailor life-extension strategies to each reason for product failure and to identify the economic motivations for implementing these strategies. The results suggest that a product template in which the long-lived structure accounts for a relatively high share of costs while short-lived components can be easily replaced (offering profit to the producer and enhanced utility to owners) encourages product life extension. 相似文献