Design of a Flexible Data Acquisition and Control System

1995 ◽  
Author(s):  
T. Gary Yip ◽  
Dennis Loh
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Automatic Testing ◽  
Automatic Data ◽  
System A ◽  
Custom Design ◽  
Data Volume ◽  
Signal Processors ◽  
And Control ◽  
Automatic Data Acquisition

Abstract Automatic data acquisition and control have become an indispensable part of engineering but many data acquisition and control equipments remain relatively inflexible and cumbersome for most engineering applications. Hence, engineers often need to custom design and build their data acquisition and control system to support their in-house automatic testing and monitoring equipment. This project investigates the design fundamentals and guidelines in setting up a flexible data acquisition and control system. A flexible data acquisition and control system (FDACS) is defined as one which possesses such characteristics as the ease of implementation, the ease of upgrading system’s capability (e.g. data volume and control channels) and the ability for information sharing. An experimental data acquisition system is used as the platform to facilitate the study. It consists of an IBM compatible personal computer, a remote host microprocessor and seven signal processors. Using this implementation, the system is able to provide up to 28 digital I/O lines, 28 analog input lines, 42 digital output lines and an average execution time per instruction of 1 ms.

scholarly journals Diseño de interfaz de control y adquisición de datos para un prototipo didáctico de refrigeración

2019 ◽  
pp. 1-7
Author(s):  
Fernando Chavarría-Domínguez ◽  
Isidro Jimenez-Silva ◽  
Fernando Hernandez-Barabata ◽  
Hugo Noble-Perez
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Polynomial Regression ◽  
Process Variable ◽  
Signal Acquisition ◽  
Laboratory Equipment ◽  
Labview Software ◽  
System A ◽  
Power Stage ◽  
And Control

The main objective of this work is to present the design and construction of a control system and data acquisition for a didactic refrigeration prototype, the didactic prototype consists of an evaporation cooling cycle in which it is important to know the voltage variables, current in the compressor, as well as pressure and temperature at each stage of the cycle, in order to understand the thermodynamic phenomena that occur in its operation. The data acquisition and control system reads, registers and displays the voltage, current, temperature and pressure variables on a machine-man interface, in turn it controls the operation of the prototype compressor and fan, when some process variable exceeds the limits permissible. In this system we use the Arduino platform, pressure, voltage, temperature and current sensors as part of the signal acquisition and conditioning system, as a virtual instrumentation environment the LabVIEW software, and a relay module as a power stage to control the outputs of the system. A polynomial regression of 3 orders was used to condition the voltage sensor readings. To verify the operation of the data acquisition system, the readings were compared against measurements of calibrated laboratory equipment.

MICROPROCESSOR-CONTROLLED MINI-ENVIRONMENTAL CHAMBERS CAPABLE OF SUBFREEZING TEMPERATURES IN CONSTANT OR TIME-VARYING TEMPERATURE REGIMES

1998 ◽  
Vol 130 (1) ◽  
pp. 91-104 ◽  
Author(s):  
D.R. Gray ◽  
F.W. Ravlin ◽  
J.A. Logan
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Ethyl Alcohol ◽  
Minimum Temperature ◽  
Thermodynamic Characteristics ◽  
Time Varying ◽  
System A ◽  
Temperature Regimes ◽  
Environmental Chambers ◽  
And Control

AbstractA set of six microprocessor-controlled mini-environmental chambers (0.04 m3 each) was designed, built, and tested. Chambers are capable of subfreezing temperatures (less than −10 °C) and can operate under constant or time-varying temperature regimes. Chambers are cooled by circulating ethyl alcohol from a reservoir chilled by an immersion cooler. Heat is provided by 17-W cartridge heaters. Temperatures are independently controlled by a single IBM 8088 computer instructing a data acquisition and control system. A single photoperiod is maintained by a commercial timer activating two miniature light bulbs in each chamber. Chamber temperatures were within 0.5 or 0.75 °C of the set temperature 65 or 94% of the time, respectively, during a 39-d test period. Minimum temperature capabilities were estimated for a variety of chamber configurations by an examination of the thermodynamic characteristics of the system.

scholarly journals VILNIUS ADVANCED-SURFACE MOVEMENT GUIDANCE AND CONTROL SYSTEM (A-SMGCS) SAFETY OBJECTIVES / VILNIAUS AERODROMO AUTOMATIZUOTOS ANTŽEMINIO EISMO STEBĖJIMO IR KONTROLĖS SISTEMOS SAUGOS TIKSLŲ ANALIZĖ

Aviation ◽  
2012 ◽  
Vol 16 (4) ◽  
pp. 130-135
Author(s):  
Vaidotas Kondroška ◽  
Jonas Stankūnas
Keyword(s):  
Control System ◽  
System Analysis ◽  
Flight Safety ◽  
Frequency Of Occurrence ◽  
Surface Movement ◽  
Safety Requirements ◽  
Methods Of Determination ◽  
Guidance And Control ◽  
System A ◽  
And Control

This work reviews the innovative and progressive methods of determination and analysis of safety objectives using Vilnius A-SMGCS example. The aim of the analysis is to determine how failures in this system could affect flight safety in Vilnius aerodrome. Identified safety objectives will limit the frequency of occurrence of hazards enough for the associated risk to be acceptable, and will ensure that appropriate mitigation means are reflected subsequently as Safety Requirements for the system. Analysis reflects aspects of A-SMGCS Safety objectives, which should be taken into consideration. Santrauka Darbe apžvelgiami progresyvūs saugos tikslų analizės metodai pagal Vilniaus aerodromo automatizuotos antžeminio eismo stebėjimo ir kontrolės sistemos veiklos pavyzdį. Analizuojama, kaip šios sistemos sutrikimai gali paveikti skrydžių saugą Vilniaus aerodrome. Remiantis galimų pavojų skrydžių saugai analize, tyrime nustatyti saugos tikslai, pagal kuriuos vėliau bus numatomos riziką mažinančios priemonės (galimų pavojų neutralizavimui ar kylančios rizikos sumažinimui iki priimtino lygio). Straipsnyje pateikiami veiksniai, kuriuos reikėtų įvertinti nustatant aerodromo automatizuotos antžeminio eismo stebėjimo ir kontrolės sistemos saugos tikslus.

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