Helicopter Data Acquisition SystemTeam MembersTeam ResponsibilitiesPurposeMotivationSlide 6Slide 7Project AbstractSlide 9ComponentsDesign RequirementsSlide 12Test RequirementsSummaryFuture ImprovementsReferencesHelicopter Data Acquisition SystemHelicopter Data Acquisition SystemECE 4512 Senior Design IECE 4512 Senior Design ITeam MembersTeam MembersDavid PaulDavid PaulAaron HillAaron HillRobert McInnisRobert McInnisJason SchemmelJason SchemmelDr. Rob KingDr. Rob King (Advisor)(Advisor)Team ResponsibilitiesTeam Responsibilities Aaron Hill (Power)Aaron Hill (Power)Circuit board layout, power consumption, and package design David Paul (Controls)David Paul (Controls)Simulink, sensor pak installation, and control circuit design Jason Schemmel and Robert McInnis (Communications)Jason Schemmel and Robert McInnis (Communications)RF design, circuit simulation, and antenna designPurposePurposeTo implement a helicopter data acquisition system obtaining real-time data from the fuselage and a rotating bladeData from rotating blade can only be obtained accurately with a wireless communications systemMotivationMotivationHubBladePivotNonlinear stiffness springPOTStrain GaugeMotivationMotivationComputer simulation of baseline case, blade lead Computer simulation of baseline case, blade lead angles without Duffing stiffnessangles without Duffing stiffness spring 0 1 2 3 4 5 6 7 8 -100 -80 -60 -40 -20 0 20 40 60 80 100 Time (sec) Blade Lead Angle (deg) Baseline Case w/o Duffing SpringMotivationMotivation 0 1 2 3 4 5 6 7 8 -100 -80 -60 -40 -20 0 20 40 60 80 100 Time (sec) Blade Lead Angle (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 springProject AbstractProject AbstractWheatstone Wheatstone BridgeBridgeWheatstone Wheatstone BridgeBridgePosition Position TransducerTransducerPosition Position TransducerTransducerBattery Battery Pack Pack Power Power SourceSourceTransmitterTransmitterTransmitterTransmitter2:1 Mux2:1 Mux2:1 Mux2:1 MuxSampler/ Sampler/ A/D A/D ConverterConverterSampler/ Sampler/ A/D A/D ConverterConverterWheatstone Wheatstone BridgeBridgeWheatstone Wheatstone BridgeBridgeAmplifier Amplifier Signal Signal ConditionerConditionerAmplifier Amplifier Signal Signal ConditionerConditionerStrain GaugeStrain GaugeStrain GaugeStrain GaugeKEYKEYPowerPowerSignalSignalEM SignalEM SignalProject AbstractProject AbstractHelicopter Helicopter House House PowerPower1:2 Demux1:2 Demux1:2 Demux1:2 DemuxD/A Converter/D/A Converter/BufferBufferD/A Converter/D/A Converter/BufferBufferKEYPowerSignalEM SignalData EnableReceiverReceiverReceiverReceiverLaptopLaptopLaptopLaptopInternal Internal Sensor Sensor PackagePackageInternal Internal Sensor Sensor PackagePackageDAQ DAQ PCMCIAPCMCIADAQ DAQ PCMCIAPCMCIAComponentsComponentsPCMCIA DAQ Card PCMCIA DAQ Card with Dell laptopwith Dell laptopSimulink using Simulink using MatlabMatlabA/D conversions A/D conversions and multiplexingand multiplexingSignal encoding and decodingSignal encoding and decodingSignal conditioning Signal conditioning and amplificationand amplificationDesign RequirementsDesign RequirementsControl CircuitControl CircuitPowerPowerSignal ConditioningSignal ConditioningTransmission FrequencyTransmission FrequencyDesign a control circuit to synchronize MUX/DEMUX and data converters Batteries must be selected toprovide 333 mW for a maximum timeof 45 minutes± 3.5 mV range must be amplified and conditioned to a 0-5V range for proper sampling Frequency selected (100-400 MHz)for a practically sized antennaDesign RequirementsDesign RequirementsData TransmissionData TransmissionSampling RateSampling RateAntenna PolarizationAntenna PolarizationCalibrationCalibrationSerial bit length must be chosen for a quantized signal with at least a precision of 2mV increments Sampling frequency of 100 Hz for adequate signal accuracyTransmitting antenna must be oriented 90° with respect toreceiving antenna Software calibration is required prior to session to compensate for physical inadequaciesTest RequirementsTest RequirementsConstraints Circuit Modeling Simulink OscilloscopeSpectrum AnalyzerModel Test StandsControl CircuitX Power X X X Transmission Frequencies X DataTransmissionX X Sampling Rates X X Calibration XX Antenna Polarization XSignal Conditioning X X XSummarySummaryTransmitting/Receiving SystemSensor PakFuture ImprovementsFuture Improvements Automated helicopter control system Implement transmitting on/off switchReferencesReferences•M.L. Deutsch, “Ground Vibrations of Helicopters,” M.L. Deutsch, “Ground Vibrations of Helicopters,” Journal of the Aeronautical Journal of the Aeronautical SciencesSciences, Vol. 15, No.5, May 1946., Vol. 15, No.5, May 1946. •R.W. Prouty, R.W. Prouty, Helicopter AerodynamicsHelicopter Aerodynamics, PJS Publishers, Inc., Peoria, IL, 1985., PJS Publishers, Inc., Peoria, IL, 1985. •B.P. Lathi, B.P. Lathi, ModernModern Digital and Analog Communication SystemsDigital and Analog Communication Systems, Oxford University , Oxford University Press, New York, New York, 1998Press, New York, New York, 1998 •C.W. Sayer, C.W. Sayer, The Complete RF Technician’s Handbook,The Complete RF Technician’s Handbook, PROMPT Publications, PROMPT Publications, Indianapolis, Indiana, 1998Indianapolis, Indiana, 1998 •United Technologies [Online]. Available: http://www.utc.com/discover/index.htm [2000, United Technologies [Online]. Available: http://www.utc.com/discover/index.htm [2000, September 3].September 3]. •R.W. Prouty, R.W. Prouty, Helicopter Performance, Stablility, and ControlHelicopter Performance, Stablility, and Control, PWS Publishers, Boston, , PWS Publishers, Boston, MA, 1986.MA, 1986. •Title 47, Part 15 – Radio Frequency Devices,” Title 47, Part 15 – Radio Frequency Devices,” Code of RegulationCode of Regulations, Federal s, Federal Communications Commission, USA, 16 April 1999.Communications Commission, USA, 16 April 1999. •Omega Technologies [Online]. Available: Omega Technologies [Online]. Available: http://www.omega.com/literature/transactions/volume3/strain2.html [2000, September http://www.omega.com/literature/transactions/volume3/strain2.html [2000, September
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