buletinul institutului politehnic din iaşi bulletin of the polytechnic ...

CONSIDERATIONS ABOUT CONTROL CHARTS
USED IN STATISTICAL PROCESS CONTROL
II. CONTROL CHARTS FOR INFREQUENT AND
CUMULATIVE DATA
by
CĂTĂLIN UNGUREANU, IRINA COZMÎNCĂ and RADU
IBĂNESCU
Abstract. Processes quality control is very important for
organizational success and maintaining it on market. SPC is a
reliable and economical method of monitoring the evolution of a
productive process. In industrial practice are encountered cases
when classical control charts, Shewhart type, are not recommended.
The purpose of this paper is to analyze control charts using in these
cases. Special attention is given to the EWMA and CUSUM charts.
Key words: quality control, control chart, EWMA chart,
CUSUM chart.
FUNCTIONAL DIAGRAMS FOR MODELING
THE RESERVOIR EMPTYING PROCESS
THROUGH A SMALL EMPTYING ORIFICE
by
DĂNUŢ ZAHARIEA
Abstract. In this paper the emptying process of a reservoir with
constant cross-sectional area through an emptying small orifice will
be investigated. Two types of reservoir will be considered: with
constant head and with variable head. The pressure at the water
surface and also the velocity of this surface, as well as the flow
discharge coefficient of the emptying orifice will be considered. The
fundamental equations governing the reservoir emptying process
will be presented (the analytical method). For modeling and
simulating the reservoir emptying process two functional diagrams
based on MATLAB/Simscape computational approach suited to
analyze the real physical systems consisting of real physical
functional blocks will be presented (the functional diagrams