نتایج جستجو برای: profile monitoring

تعداد نتایج: 513845  

  In an increasing number of practical situations, the quality of a process or product can be effectively characterized and summarized by a profile. A profile is usually a functional relationship between a response variable and one or more explanatory variables which can be modeled frequently using linear or nonlinear regression models. In this paper, we study the effect of non-normality on pro...

Journal: :Revista Colombiana de Estadística 2014

Mahdiyeh Kalaei Paria Soleimani Seyed Taghi Akhavan Niaki

In most modern manufacturing systems, products are often the output of some multistage processes. In these processes, the stages are dependent on each other, where the output quality of each stage depends also on the output quality of the previous stages. This property is called the cascade property. Although there are many studies in multistage process monitoring, there are fewer works on prof...

Journal: :Journal of physics 2022

Machine condition monitoring (MCM) aims to evaluate machine health conditions by statistically analysing data. Health indicators (HIs) such as Gini index, negative entropy, spectral kurtosis et al. have been commonly applied in MCM. But these HIs lack a statistical threshold and monotonic degradation tendency. To monitor the of rotating machines, nonparametric nonlinear profile method for MCM i...

Control charts are powerful tools to monitor quality characteristics of services or production processes. However, in some processes, the performance of process or product cannot be controlled by monitoring a characteristic; instead, they require to be controlled by a function that usually refers as a profile. This study suggests employing exponentially weighted moving average (EWMA) and range ...

2015
Christopher P. Ward Roger M. Goodall Roger Dixon

Increased railway patronage worldwide is putting pressure on rolling stock and infrastructure to operate at higher capacity and with improved punctuality. Condition monitoring is seen as a contributing factor in enabling this and is highlighted here in the context of rolling stock being procured with high capacity data buses, multiple sensors and centralised control. This therefore leaves scope...

2008
WILLIAM H. WOODALL

Resumo Em muitas aplicações a qualidade de um processo ou de um produto é melhor caracterizada e descrita por uma relação funcional entre a variável resposta e uma ou mais variáveis explicativas. Monitoramento de perfis é usado para entender e checar a estabilidade desta relação ao longo do tempo. Cada vez que uma amostra é selecionada, uma coleção de pontos que pode ser representada por uma cu...

نورالسناء, زسول, نیکو, مهرداد,

In many industrial processes, quality of a process can be characterized as a nonlinear relation between a response variable and explanatory variables. In several articles, use of nonlinear regression is suggested for monitoring nonlinear profiles. Such regression has two disadvantages. First the distribution of the regression coefficients cannot be specified for small samples and second with in...

M. Nikoo, rassoul Noorossana,

In many manufacturing processes, the quality of a product is characterized by a non-linear relationship between a dependent variable and one or more independent variables. Using nonlinear regression for monitoring nonlinear profiles have been proposed in the literature of profile monitoring which is faced with two problems 1) the distribution of regression coefficients in small samples is unkno...

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