On-line integrity monitoring of microprocessor control logic

2002 ◽  
Author(s):  
Seongwoo Kim ◽  
A.K. Somani
Keyword(s):  
Control Logic ◽  
Microprocessor Control ◽  
Integrity Monitoring ◽  
On Line

Automatic electron tomography

1991 ◽  
Vol 49 ◽  
pp. 544-545
Author(s):  
D. Typke ◽  
K. Dierksen ◽  
W. Baumeister
Keyword(s):  
Electron Tomography ◽  
Ccd Camera ◽  
Automatic Recording ◽  
Large Area ◽  
Microprocessor Control ◽  
On Line ◽  
Electron Microscopes ◽  
Set Up ◽  
Ccd Arrays ◽  
New Generation

The new generation of microprocessor-controlled electron microscopes in combination with large-area CCD arrays and fast image processing computers enables automatic control of complex imaging procedures. Using a Philips CM 20 CTEM equipped with a Photometries 1Kx1K CCD camera and a TEMDIPS computer, we have set up automatic recording of tilt series for tomographic 3D reconstruction. It is our goal to combine automatic recording with on-line processing of the measured data.Fig. 1 shows a scheme of the experimental set-up. As the goniometer is not incorporated in the microprocessor control of the CM 20, an accurate readout of the tilt angle (resolution 0.01 deg.) and an additional board in the external computer driving the goniometer motor have been installed. The CCD camera is mounted on a pivotable flange; this allows to adjust its orientation with respect to the tilt axis direction in the image. For magnifications higher than 5,000x it is necessary to correct for image displacements caused by the limited mechanical accuracy of the goniometer (ca. +/-1 μm).

GSP, a Generic Object-Oriented Gas Turbine Simulation Environment

2000 ◽  
Author(s):  
Wilfried P. J. Visser ◽  
Michael J. Broomhead
Keyword(s):  
Performance Analysis ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Engine Performance ◽  
Object Oriented ◽  
Control Logic ◽  
Turbine Engine ◽  
Industrial Gas Turbines ◽  
On Line ◽  
Turboshaft Engine

NLR’s primary tool for gas turbine engine performance analysis is the ‘Gas turbine Simulation Program’ (GSP), a component based modeling environment. GSP’s flexible object-oriented architecture allows steady-state and transient simulation of any gas turbine configuration using a user-friendly drag&drop interface with on-line help running under Windows95/98/NT. GSP has been used for a variety of applications such as various types of off-design performance analysis, emission calculations, control system design and diagnostics of both aircraft and industrial gas turbines. More advanced applications include analysis of recuperated turboshaft engine performance, lift-fan STOVL propulsion systems, control logic validation and analysis of thermal load calculation for hot section life consumption modeling. In this paper the GSP modeling system and object-oriented architecture are described. Examples of applications for both aircraft and industrial gas turbine performance analysis are presented.

Computer-Based Retort Control Logic for On-Line Correction of Process Deviations

1986 ◽  
Vol 51 (2) ◽  
pp. 480-483 ◽  
Author(s):  
A. K. DATTA ◽  
A. A. TEIXEIRA ◽  
J. E. MANSON
Keyword(s):  
Control Logic ◽  
On Line ◽  
Computer Based

Computer Simulation of On-Line Control of Thermal Sterilization of Canned Foods Subjected to Arbitrary Retort Temperature Deviations

2005 ◽  
Vol 1 (5) ◽  
Author(s):  
Ibrahim O. Mohamed
Keyword(s):  
Computer Control ◽  
Current Control ◽  
Maximum Relative Error ◽  
Control Logic ◽  
Alternating Direction ◽  
Lethal Rate ◽  
On Line ◽  
Canned Foods ◽  
Thermal Sterilization ◽  
Relative Errors

A computer control logic algorithm has been developed to compensate for the effects of arbitrary retort temperature deviations on lethality. The algorithm is based on calculating the can center temperature for any retort temperature profiles using an alternating direction implicit finite difference method. Lethal rate and corresponding accumulated lethality were calculated during the simulation process. Five types of process deviations were investigated including one with multiple deviations. All the deviations investigated resulted in serious under processing with relative errors in sterilization value ranges from 16.9 % to 43.2 %. A correction measure for process with retort temperature deviations based on targeting the lethal rate of the standard process at the end of the heating phase was proposed. The implementation of this measure resulted in successful correction for all the deviations investigated with a maximum relative error in sterilization value of 9.5 % on the over processing side. This work indicates that the current control algorithm could be incorporated in HACCP guideline, as an online corrective measure for retort temperature deviations during thermal sterilization process.

Pipeline Integrity Conference Covers a Wide Field

1987 ◽  
Vol 20 (1) ◽  
pp. 34-35
Author(s):  
John Tiratsoo
Keyword(s):  
Wide Field ◽  
Integrity Monitoring ◽  
Recent Conference ◽  
On Line ◽  
Pipeline Monitoring ◽  
Successful Event

The recent conference entitled ‘Pipeline Integrity Monitoring’ and organised by Pipes and Pipelines International, was held in Aberdeen in October 1986. It created a useful opportunity for delegates from the pipeline industry in seven countries to discuss the technology associated with on-line pipeline monitoring. The paper presents a review of the conference and discusses the highlights of a very successful event.

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