维修过程中物品失效模式的变化:对完美维修假设的调查

J. M. Block, Peter Söderholm, T. Tyrberg
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摘要

显然,简单的完美修复假设并不立即适用于所研究的任何硬件类型,即冷却涡轮机。、高压发电机、液压蓄能器和雷达发射机。因此,需要对每种特定类型的物品验证“完美修复”的假设。基于物理硬件(如机械设备或航空电子设备)类型的假设并不总是可信的。奇怪的是,“完美修复”的假设最适合冷却涡轮,这是一个高度紧张的机械项目,而适合雷达发射机,这是一个航空电子设备项目和液压蓄能器。对于雷达发射机来说,趋势似乎非常分散。对于在其生命周期早期有大量故障的物品,修复是“比完美更好”的,即物品在修复后变得更可靠,可能是通过消除不太可靠的子组件。然而,对于在其生命周期早期很少失败的项目,这种影响并不明显。对于这些物品,“完美修复”最初似乎是一个有效的模式。然而,在许多情况下,在生命周期的后期,修复变得“不那么完美”。对于液压蓄能器,这种趋势更加突出,单个项目似乎属于两个不同的亚群,具有相反的可靠性趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Changes in items' failure pattern during maintenance: An investigation of the perfect repair assumption
It is clear that the simple dasiaperfect repairpsila assumption is not immediately applicable to any of the studied types of hardware, i.e. cooling turbine., high-voltage generator, hydraulic accumulator, and radar transmitter. Hence, the assumption of 'perfect repair' needs to be validated for each specific type of item. Assumptions based on the type of physical hardware (e.g. mechanical item or avionics item) are not always trustworthy. Strangely enough the 'perfect repair' assumption fits best for the cooling turbine, which is a highly stressed mechanical item, while the fit is much poorer for the radar transmitter, which is an avionics item and for the hydraulic accumulator. For the radar transmitter the trend seems to be very scattered. For items with a large number of failures early in their life-cycle, repair is 'better than perfect', i.e. the items become more reliable after repair, presumably by elimination of less reliable subcomponents. However, this effect is not seen for items with few failures early in their life-cycle. For these items 'perfect repair' initially seems to be a valid model. However, in many casesrepair becomes 'less than perfect' later in the life-cycle. For the hydraulic accumulator this trend is even more accentuated and individual items seem to fall into two distinct subpopulations with opposite reliability trends.
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