Design and Use of X - Chart for Process Control and Decision - Making : A Practical Approach
نویسندگان
چکیده
A more practical design of X-chart has been proposed which recognizes that the process mean, in the majority of industrial operations, is a random variable, and uses the necessary information on the production rate and specification limits and the ratio of costs of false alarm and producing defectives. A methodology has been proposed to see whether incorporation of warning limits is effective for a given process and for using the data points obtained on the current process for prediction and decision-making. Examples from earlier publications have been used for justification and sensitivity analyses have been carried out to study the effects of the various factors.
منابع مشابه
Economical-Statistical design of one- sided CCC-r control chart based on analytical hierarchy process
The cumulative count of a conforming (CCC) control chart is used for high quality processes.The CCC − r chart is an improvement of the CCC chart that is based on the cumulative number of items inspected until observing r non-conforming ones. This paper aims to propose a new approach for manufacturer’s decision making according to the criteria among the available options. The o...
متن کاملEconomic design of x¯ control charts considering process shift distributions
Process shift is an important input parameter in the economic design of control charts. Earlier x control chart designs considered constant shifts to occur in the mean of the process for a given assignable cause. This assumption has been criticized by many researchers since it may not be realistic to produce a constant shift whenever an assignable cause occurs. To overcome this difficulty...
متن کاملConstruction of α-cut fuzzy X control charts based on standard deviation and range using fuzzy triangular numbers
Control charts are one of the most important tools in statistical process control that lead to improve quality processes and ensure required quality levels. In traditional control charts, all data should be exactly known, whereas there are many quality characteristics that cannot be expressed in numerical scale, such as characteristics for appearance, softness, and color. Fuzzy sets theory is a...
متن کاملA New Statistical Approach for Recognizing and Classifying Patterns of Control Charts (RESEARCH NOTE)
Control chart pattern (CCP) recognition techniques are widely used to identify the potential process problems in modern industries. Recently, artificial neural network (ANN) –based techniques are very popular to recognize CCPs. However, finding the suitable architecture of an ANN-based CCP recognizer and its training process are time consuming and tedious. In addition, because of the black box ...
متن کاملEconomic-statistical Design of NP Control Chart with Variable Sample Size and Sampling Interval
The control charts are graphical tools and proven techniques to improve the performance of a process. Usually, the processes are not naturally controlled, so the use of control charts will help to reduce the variability and increase the stability of the process. In the traditional approach, control charts with fix sample size and constant sampling intervals were used to identify the changes in ...
متن کامل