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Helicopter Data Acquisition SystemHelicopter Data Acquisition System
ECE 4512 Senior Design IECE 4512 Senior Design I
Team MembersTeam Members
David PaulDavid Paul
Aaron HillAaron Hill
Robert McInnisRobert McInnis
Jason SchemmelJason Schemmel
Dr. Rob KingDr. Rob King (Advisor)(Advisor)
Team ResponsibilitiesTeam Responsibilities Aaron Hill (Power)Aaron Hill (Power)
Battery selection and power consumption simulation
David Paul (Controls)David Paul (Controls)
Control circuit design and simulation
Jason Schemmel (Communications)Jason Schemmel (Communications)
Antenna simulation and transmitter/receiver simulation
Robert McInnis (Communications)Robert McInnis (Communications)
Signal conditioning, sampling, and data conversion
MotivationMotivation
Utilizes all aspects of Electrical EngineeringUtilizes all aspects of Electrical Engineering
High Level of DifficultyHigh Level of Difficulty
Can be used in many other applicationsCan be used in many other applications
Improvement of existing techniques Improvement of existing techniques
Problem StatementProblem Statement
To develop a more efficient data acquisition system obtaining real-time data from a high speed rotating blade by replacing the use of slip-rings
Design RequirementsDesign Requirements
Control CircuitControl Circuit
PowerPower
Signal ConditioningSignal Conditioning
Transmission FrequencyTransmission Frequency
Design a control circuit to synchronize MUX/DEMUX and data converters
Batteries must be selected toprovide 500 mW for a typical flight
time of 60 minutes
± 15 mV range must be amplified and conditioned to a 0-10V
range for proper sampling Frequency selected (300-500 MHz)
for a practically sized antenna
Design RequirementsDesign Requirements
Data TransmissionData Transmission
Sampling RateSampling Rate
Antenna PolarizationAntenna Polarization
CalibrationCalibration
Serial bit length must be chosen for a quantized signal with a
precision of .10 and 2 microstrains
Sampling frequency of 250 Hz for adequate signal recoveryTransmitting antenna must be oriented to prevent polarization mismatches with the receiver
Hardware and Software calibration is required
prior to session to compensate
for physical inadequacies
Design ExplanationDesign ExplanationPosition Position
TransducerTransducerPosition Position
TransducerTransducer Battery Battery Pack Pack
Power Power SourceSource
TransmitterTransmitterTransmitterTransmitter
2:1 Mux2:1 Mux2:1 Mux2:1 Mux
Sampler/ Sampler/ A/D A/D
ConverterConverter
Sampler/ Sampler/ A/D A/D
ConverterConverter
Wheatstone Wheatstone BridgeBridge
Wheatstone Wheatstone BridgeBridge
Amplifier Amplifier Signal Signal
ConditionerConditioner
Amplifier Amplifier Signal Signal
ConditionerConditioner
Strain GaugeStrain GaugeStrain GaugeStrain Gauge
KEYKEY
PowerPower
SignalSignal
EM SignalEM Signal
Design ExplanationDesign Explanation
Helicopter Helicopter House House PowerPower
1:2 Demux1:2 Demux1:2 Demux1:2 Demux
D/A D/A Converter/Converter/
BufferBuffer
D/A D/A Converter/Converter/
BufferBuffer
KEY
Power
Signal
EM Signal
ReceiverReceiverReceiverReceiver
LaptopLaptopLaptopLaptop
Internal Internal Sensor Sensor
PackagePackage
Internal Internal Sensor Sensor
PackagePackage
DAQ DAQ PCMCIAPCMCIADAQ DAQ
PCMCIAPCMCIA
Simulation Results Simulation Results
Power ConsumptionPower Consumption
Sampling and Data Conversion Sampling and Data Conversion
Control CircuitControl Circuit
Signal Conditioning Signal Conditioning
Power ConsumptionPower Consumption Battery Discharge Rate
14.5
15
15.5
16
16.5
17
0 10 20 30 40 50 60 70 80
Time (min)
Vol
ts
Negative 15 Volts
Positive 15 Volts
Minimum Battery LifeMinimum Battery Life
Sampling and Data ConversionSampling and Data Conversion
0 1 2 3 4 5 6 7 8 -100
-80
-60
-40
-20
0
20
40
60
80
100
Time (sec)
Bla
de L
ead
Ang
le (
deg)
Baseline Case w/ Duffing Spring
Computer simulation of baseline case, blade lead Computer simulation of baseline case, blade lead angles with Duffing stiffness springangles with Duffing stiffness spring
Signal Conditioning (Amp)Signal Conditioning (Amp)
Wheatstone Bridge Output (V12 – V11)
Gain Adjust Output
Signal Conditioning (Amp)Signal Conditioning (Amp)
Gain = 333 V/V
Gain = 333 V/V difference amplifier
Amplified Signal±7.5mV Input Signal
Signal Conditioning (Filter)Signal Conditioning (Filter)
fc = 15 Hz
5Hz => -.0414532.5Hz => -.00235
dB attenuation
(-40dB/dec rolloff)
Future ImprovementsFuture Improvements
Automated helicopter control system
Implement remote transmitting on/off switch
Battery reduction circuitry
Graphical User Interface (GUI)
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