Transcript Data Acquisition and Data Management System For AESD

ARD, Carderock Division, Bayview,ID
Project Professors: Dr. Herb Hess & Dr. Brian
Johnson
Final Design Review
December 5, 2008
Jarred Coulter
Vishu Gupta
Zane Sapp
Overview
 Project introduction
 DAQ Hardware
 Sensors
 Software
 Testing/Calculations
 Recommended System
 Future Work/Conclusions
2
Project
Introduction
3
Background
 The Acoustic Research
Detachment (ARD) of the Naval
Surface Warfare Center,
Carderock Division (NSWCCD)
is located at Bayview, ID.
 The Advanced Electric Ship
AESD
Demonstrator (AESD) is a ¼
scale destroyer used to monitor
acoustics and test electric
propulsion technologies.
4
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
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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
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System Architecture
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DAQ Hardware
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NI DAQ Lab Hardware
System Components
Data Acquisition System From
National Instruments



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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)
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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
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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
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Sensors
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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
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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
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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
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Designed Sensors
 Designed Voltage Sensors
 Low power consumption
 Only one voltage
reference or ground
reference
 Simple design
Voltage Sensor Schematic
 Linear input to output
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Voltage Sensor Results
Horz = 12V
Vert = 12V
Simulation Results
Experimental Results
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Temperature Sensors
 K-type thermocouples used
• Temperature range: -452.2˚F to 1562˚F
• SCXI Modules designed for Thermocouple inputs
with integrated Cold Junction Compensation ICs
• Cost is approximately $1.00/ft for shielded
thermocouple wire
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Software
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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’
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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
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Front panel: Control/Indicator tab
 Designed for the user to control the
System and test
 Divided into different tabs on the
screen
 Instructions
Front Panel: Control
 Control/Indicator
 System error
 Voltage graphs
 Current graph
 Temperature readings
 GPS
Front Panel: Control
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TESTING &
CALCULATIONS
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Lab Setup
Thermocouples
GPS
ABB Voltage
Sensor
Current
LEM
Designed
sensors
Battery
Bank
NI DAQ
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Testing
 Tests run on the system
 Period: 2 hours
 Measured
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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
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Test Results
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Calculations
 LATENCY
 1 sec with the GPS running.
 <100ms without GPS
 Dependant on sampling frequency
 POWER CONSUMPTION
 Lab Model: 510 Watts

Including PC power consumption of 60Watts
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Recommended
System
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System Architecture Flow:
Recommended System
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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
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Future Work/
Conclusions
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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
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Conclusions
 System Capabilities:
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
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Monitoring propulsion batteries and UPS batteries
Acquiring GPS data
Data and Error Log saved as text files
 Sensors

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Voltage
Current
Temperature
 LabVIEW
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
Control the DAQ
Monitor the system
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Acknowledgements
ARD
Alan Griffitts
Frank Jurenka
Karl Sette
Research Group
Justin Schlee
John Finley
Leo Luckose
James Randall
University of Idaho
Dr. Brian K. Johnson
Dr. Herb Hess
Dr. Chris Wagner
Arleen Furedy
Karen Cassil
Beth Cree
Dorota Wilk
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Temperature sensors: Amplifier
 Amplifier adds a gain of 924.3
 This is then scaled in LabVIEW
 Explained later on in the presentation
Batteries
Thermocouple
measurement
Amplifier
Amplified
Thermocouple
Voltage
LabVIEW
(scale down)
DAQ
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Temperature data
 Modify amplified signal to
Amplified signal from SCXI
1104-C
Output temperature on
thermocouple 1
obtain temperature
readings.
 The amplified signal is
Built –in VI for converting
Voltage to temperature
scaled down by the gain
factor
 Built in VI for converting
voltage to temperature
 Outputs the temperature
 The units can be
changed
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Detailed cost analysis sheet of the
recommended system
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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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