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Gráficos de controle X para processos robustos
(Universidade Federal de São Carlos (UFSCar), 1998-12-01)
O avanço tecnológico tem tornado os processos produtivos cada vez mais robustos (robustos no sentido de produzirem itens cada vez mais iguais). Neste contexto, pequenas alterações no processo podem ser críticas, devendo ...
Some Comments Regarding the Synthetic (X)over-bar Chart
(Taylor & Francis Inc, 2014-01-01)
The steady-state average run length (ARL) is a function of the in-control probabilities of being in each nonabsorbing state. Davis and Woodall (2002) tabulated values that are significantly smaller than the steady-state ...
(X)OVER-BAR CHARTS WITH VARIABLE SAMPLE-SIZE
(Amer Soc Quality Control-asqc, 1994-07-01)
The usual practice in using a control chart to monitor a process is to take samples of size n from the process every h hours This article considers the properties of the XBAR chart when the size of each sample depends on ...
The Shewhart attribute chart with alternated charting statistics to monitor bivariate and trivariate mean vectors
(2018-08-01)
In this article, we combined the Alternated Charting Statistic (ACS) scheme with the traditional attribute np chart to control mean vectors of bivariate and trivariate normal processes. With the bivariate ACS scheme in use ...
(X)OVER-BAR CHARTS WITH VARIABLE SAMPLE-SIZE
(Amer Soc Quality Control-asqc, 2014)
Gráficos de controle X para processos robustos
(Universidade Federal de São Carlos (UFSCar), 2014)
Gráficos de controle de Shewhart, CUSUM e EWMA: um estudo comparativo em verificação intermediária de balanças
(Universidade Federal de Santa MariaBrasilUFSMCentro de Tecnologia, 2017-11-27)
The quality assurance of measurements results generated by testing and calibration laboratories based on ABNT NBR ISO/IEC 17025 is directly associated with process monitoring undertaken by their measuring instruments. This ...
Joint (X)over-bar and R charts with two-stage samplings
(Wiley-Blackwell, 2004-11-01)
When joint (X) over bar and R charts are in use, samples of fixed size are regularly taken from the process, and their means and ranges are plotted on the (X) over bar and R charts, respectively. In this article, joint (X) ...
Joint (X)over-bar and R charts with two-stage samplings
(Wiley-Blackwell, 2004-11-01)
When joint (X) over bar and R charts are in use, samples of fixed size are regularly taken from the process, and their means and ranges are plotted on the (X) over bar and R charts, respectively. In this article, joint (X) ...
A new sampling strategy to reduce the effect of autocorrelation on a control chart
(2014-01-01)
On-line monitoring of quality characteristics is essential to limit scrap and rework costs due to bad quality in a manufacturing process. In several manufacturing environments, during production process data can be massively ...