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Data Acquisition and Data Management System For AESD

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Title: Data Acquisition and Data Management System For AESD Author: Administrator Last modified by: Zane Created Date: 11/27/2008 12:31:59 AM Document presentation format – PowerPoint PPT presentation

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Title: Data Acquisition and Data Management System For AESD


1
Data Acquisition and Data Management System For
AESD
ARD, Carderock Division, Bayview,ID Project
Professors Dr. Herb Hess Dr. Brian Johnson
Final Design ReviewDecember 5, 2008
  • Jarred Coulter
  • Vishu Gupta
  • Zane Sapp

2
Overview
  • Project introduction
  • DAQ Hardware
  • Sensors
  • Software
  • Testing/Calculations
  • Recommended System
  • Future Work/Conclusions

3
ProjectIntroduction
4
Background
  • The Acoustic Research Detachment (ARD) of the
    Naval Surface Warfare Center, Carderock Division
    (NSWCCD) is located at Bayview, ID.
  • The Advanced Electric Ship Demonstrator (AESD)
    is a ¼ scale destroyer used to monitor acoustics
    and test electric propulsion technologies.

AESD
5
Project Goals
  • Design a Data Acquisition System (DAQ) to
    interface with the existing systems on the AESD
    to
  • Manage and display battery data from the
    propulsion and UPS systems
  • Data for voltages, currents, and temperatures
  • Correlate above data with the GPS data available
  • Graphical display
  • On board data storage buffer
  • Expandable Architecture

6
Design specifications
  • Ungrounded system
  • 120 V AC 25Amps available
  • Maximum 12 hours of data storage
  • System needs to be space efficient/ rack
    mountable
  • Expandable Architecture
  • Integrate with existing sensors and GPS already
    in place on the AESD

7
System Architecture
8
DAQ Hardware
9
NI DAQ Lab Hardware
System Components
Data Acquisition System From National Instruments
  • PXI/SCXI Combination Chassis (1)
  • MXI Express Link (2)
  • M-Series DAQ and PXI/SCXI Chassis Controller (3)
  • 32-Channel Input Module/Multiplexer (4)
  • I/O Connector M-Series DAQ (Not Shown) (5)
  • Cast Screw Terminal Block for SCXI-1104C with
    Cold Junction Compensation (6)

10
NI Hardware Features
  • M-Series Data Acquisition Device
  • 333 ks/s
  • Up to 280 channels per DAQ device
  • 16-Bit ADC resolution
  • MXI-Express Connection
  • Bandwidth 110 Mb/s and up to 250 Mb/s
  • PC and laptop compatible
  • High bandwidth allows for large channel count
    through multiple chassis
  • SCXI/PXI
  • Variety of Input Modules for wide range of
    applications
  • Rugged chassis for industrial applications

11
LabVIEW 8.2
  • Built in Virtual Instruments (VI) for data
    acquisition, analysis, storage and display
  • Mathscript capabilities
  • Stores all data in an ASCII text file called
    LabVIEW Measurement File (LVM)
  • DAQmx and DAQ Assistant for easier programming

12
Sensors
13
Sensors Overview
  • LEM Current Transducers
  • Accurately measure wide range of currents
  • Cost 400 per unit
  • Hall Effect Voltage Transducers
  • Capable of accurately handling very high voltages
  • Cost 250 per unit
  • Isolation Amplifier Type Voltage Transducers
  • Designed
  • Cost 5 per unit
  • K-type Thermocouple Temperature Sensors
  • Wide measurement range
  • Cost 1.00 per ft

14
LEM Current Transducer
LEM DC-C10
Features
  • DC Current Transducer
  • 3 Jumper Adjustable Ranges 5, 10, 20 Amp Max
  • Supply Voltage 20-50 VDC
  • 1 Accuracy at 25 C

15
ABB Voltage Sensor
LEM CV 3-500
Features
  • Closed Loop Hall Effect Voltage Transducer
  • Measuring Range 0 to 500 V
  • Output Voltage 0 to 10 V (Max)
  • Supply Voltage 15 VDC
  • 0.2 Accuracy at 25 C

16
Designed Sensors
  • Designed Voltage Sensors
  • Low power consumption
  • Only one voltage reference or ground reference
  • Simple design
  • Linear input to output

Voltage Sensor Schematic
17
Voltage Sensor Results
Horz 12V Vert 12V
Experimental Results
Simulation Results
18
Temperature Sensors
  • K-type thermocouples used
  • Temperature range -452.2F to 1562F
  • SCXI Modules designed for Thermocouple inputs
    with integrated Cold Junction Compensation ICs
  • Cost is approximately 1.00/ft for shielded
    thermocouple wire

19
Software
20
LabVIEW Control for the DAQ
  • Program provides for
  • Easy control for data acquisition
  • Real-time data display
  • Save the data to a file in a specified location
  • File can be opened with different analysis tools
  • User comments can also be added to the file.
  • Saved data is time and location stamped
  • Errors observed on system are saved as a text
    file- Error Log

21
Flow diagram of the code
  • Check for valid GPS signal
  • Acquire data
  • Display Voltage and Current data as graphs
  • Numerical display for temperature
  • Save data to file
  • Check for stop condition

22
Front panel Control/Indicator tab
  • Designed for the user to control the System and
    test
  • Divided into different tabs on the screen
  • Instructions
  • Control/Indicator
  • System error
  • Voltage graphs
  • Current graph
  • Temperature readings
  • GPS

Front Panel Control
Front Panel Control
23
TESTING CALCULATIONS
24
Lab Setup
Thermocouples
ABB Voltage Sensor
Current LEM
Designed sensors
NI DAQ
25
Testing
  • Tests run on the system
  • Period 2 hours
  • Measured
  • Battery Voltage (V)
  • String Current (A)
  • Battery temperature (F)
  • Measurements taken on 9 channels
  • Current LEM
  • ABB Voltage Sensor
  • Opto-coupler sensors 3
  • Thermocouples 4
  • Error observed None

26
Test Results
27
Calculations
  • LATENCY
  • 1 sec with the GPS running.
  • lt100ms without GPS
  • Dependant on sampling frequency
  • POWER CONSUMPTION
  • Lab Model 510 Watts
  • Including PC power consumption of 60Watts

28
Recommended System
29
System Architecture Flow Recommended System
30
Recommended System Calculations
  • The cost analysis for a full system with all the
    required hardware and software was done
  • Complete system includes
  • Data Acquisition Cards
  • PC Controller and External Hard Drive
  • Thermocouple/Voltage Input Modules
  • Multi Chassis Adapter
  • MXI Express Connector
  • PXI and SCXI Chassis
  • LabVIEW
  • COST ANALYSIS
  • Total system cost 140, 427.75
  • Cost per channel 87.17
  • 68 per channel for additional channels
  • POWER CONSUMPTION
  • 1350 Watts
  • Note detailed cost analysis is provided in the
    final report. Also given at the end of the
    presentation

31
Future Work/ Conclusions
32
Future Work
  • Integrate control of the sensors onto a Printed
    Circuit Board (PCB).
  • Feedback from the ARD for actual integration with
    the GPS system on-board the AESD.
  • Type of communication
  • Data format
  • Thermocouple Cards should be integrated into the
    lab model
  • Integrating real-time system with charging
    schemes of the propulsion batteries
  • Expanding LabVIEW
  • Event triggering/alarms on the monitored channels
  • For the recommended system
  • Post processing

33
Conclusions
  • System Capabilities
  • Monitoring propulsion batteries and UPS batteries
  • Acquiring GPS data
  • Data and Error Log saved as text files
  • Sensors
  • Voltage
  • Current
  • Temperature
  • LabVIEW
  • Control the DAQ
  • Monitor the system

34
Acknowledgements
  • ARD
  • Alan Griffitts
  • Frank Jurenka
  • Karl Sette

University of Idaho Dr. Brian K. Johnson Dr. Herb
Hess Dr. Chris Wagner Arleen Furedy Karen
Cassil Beth Cree Dorota Wilk
Research Group Justin Schlee John Finley Leo
Luckose James Randall
35
Temperature sensors Amplifier
  • Amplifier adds a gain of 924.3
  • This is then scaled in LabVIEW
  • Explained later on in the presentation

36
Temperature data
  • Modify amplified signal to obtain temperature
    readings.
  • The amplified signal is scaled down by the gain
    factor
  • Built in VI for converting voltage to temperature
  • Outputs the temperature
  • The units can be changed

37
Detailed cost analysis sheet of the recommended
system
38
Detailed cost analysis sheet of the system used
  • Put in the cost sheet that we had for the system
    we are using right now.
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