نتایج جستجو برای: key wordsfuzzy control chart
تعداد نتایج: 1832394 فیلتر نتایج به سال:
a new method is developed for a fast identification of the stability situation of industrial processes. the proposed method includes two factor ratios of the control constants for the upper and lower control limits to process these constants. an indication ratio is then defined as the ratio of the maximum data range value to the difference between the maximum and average values for individual d...
Recently several control charts have been introduced in the statistical process control literature which are based on the idea of Bayesian Predictive Density (BPD). Among these charts is the variation control chart which we refer to it as VBPD chart. In this paper we add the idea of Moving Average to VBPD chart and introduce a new variation control chart which has all advantages of the ...
در بسیاری از موارد، اندازه گیری واقعی واحدها با مشکلات فراوانی از قبیل صرف وقت و هزینه، به بار آمدن اثرات مخرب و کار طاقت فرسا همراه است، در حالی که رتبه بندی واحدها آسان و کم هزینه تر است. در این گونه موارد روش نمونه گیری مجموعه رتبه دار جایگزین مناسبی به جای روش نمونه گیری تصادفی ساده به نظر می رسد. در این پایان نامه ابتدا مرور مختصری بر کنترل کیفیت آماری صورت گرفته و سپس روش نمونه گیری مجموع...
Multivariate control charts such as Hotelling`s T^ 2 and X^ 2 are commonly used for monitoring several related quality characteristics. These control charts use correlation structure that exists between quality characteristics in an attempt to improve monitoring. The purpose of this article is to discuss some issues related to the G chart proposed by Levinson et al. [9] for detecting shifts in ...
In many quality control applications, the necessary distributional assumptions to correctly apply the traditional parametric control charts are either not met or there is simply not enough information or evidence to verify the assumptions. It is well known that performance of many parametric control charts can be seriously degraded in situations like this. Thus, control charts that do not requi...
identification of a real time of a change in a process, when an out-of-control signal is present is significant. this may reduce costs of defective products as well as the time of exploring and fixing the cause of defects. another popular topic in the statistical process control (spc) is profile monitoring, where knowing the distribution of one or more quality characteristics may not be appropr...
Control Chart Patterns (CCPs) recognition is one the most important concepts in control chart application. Relating the patterns exhibited on the control chart to assignable causes is an ambiguous and vague task especially when multiple patterns co-exist. In this study, a fuzzy rule-based system is developed for X ̅ control charts to prioritize the control chart causes based on the accumulated e...
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