Quality Control Method of Key Processes in Multi Variety and Small Batch Manufacturing Process Based on NAD-EWMA Control Chart

Statistical quality control in micro-manufacturing through multivariate ?-EWMA chart

Micro-manufacturing processes are characterized by high process variability and an increased significance of measurement uncertainty in relation to tight tolerance specifications. Therefore, an approach that separates the superposition of measurement and manufacturing variation is demanded. A novel design for a quality control chart that makes it possible to monitor, control and extract measure...

On Sensitivity of EWMA Control Chart for Monitoring Process Dispersion

Control chart is the most important Statistical Process Control (SPC) tool used to monitor reliability and performance of manufacturing processes. Variability EWMA charts are widely used for the detection of small shifts in process dispersion. For ease in computation all the variability EWMA charts proposed so far are based on asymptotic nature of control limits. It has been shown in this study...

A New Control Chart to Monitor Mean Shifts of Bi-Variate Quality Control Processes

One-sided EWMA control chart for monitoring high yield processes

A one-sided Exponential Weighted Moving Average (EWMA) control chart is introduced to monitor the fraction p of nonconforming products in high yield processes. It is designed to detect upward shifts of p screening the non-transformed geometric counts i.e. the number of conforming products between two nonconforming ones. Its algorithmic function is theoretically established and numerous performa...

Manufacturing Processes and Process Control