VCSO Mechanical Shock Compensation
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1 VCSO Mechanical Shock Compensation
2 Who are we? Team members: Max Madore Joseph Hiltz-Maher Shaun Hew Shalin Shah Advisor: Helena Silva Phonon contact: Scott Kraft
3 Original Goals Measure Instantaneous Frequency shifts and compare with accelerometer voltage output Design Compensation circuit based on frequency/voltage characteristics Test in and implement in 3 axis to determine the unique responses of each
4 Previous Work Last Year: Creation of Shock Tower for repeatable tests Comparison of two identical VCSOs Measurement Using Oscilloscope Problems: Unreliable Data Mismatched VCSO frequencies
5 A New Outlook Frequency Generator allows for precise matching of generator and test VCSO MATLAB code allows us to control Shock tower impulse, view multiple trials, filter results digitally Better understanding of VCSO components and their reaction to shock
6 Project Overview VCSO and mechanical vibration Analog filter for compensation of 20dB Expand compensation to three axes
7 Shock Tower Uses 24V solenoid to drive a rod against a metal plate VCSO and accelerometer sit on the plate and experience shock Important to eliminate all erroneous vibration Resonance Loose parts
8 Signal Generator Giga-tronics 6060B 10kHz-1.05GHz Provides a stable reference that can match the VCSO s normal output
9 Phase Frequency Detector Hittite HMC439QS16G Mixes the signals from the Signal Generator and VCSO Outputs a triangular waveform whose frequency is the difference in frequency of its inputs
10 Data Acquisition National Instruments X series USB-6353 Data Acquisition Card MATLAB 2009 on lab computer Filtration may be desired to remove high frequency noise Looking for changes in the hundreds of Hertz or less Sample Rate is not fast enough to collect data directly from the VCSO or signal generator Also used to fire the solenoid in the shock tower
11 Last Semester s Results Phase frequency detector output of uncompensated shock response
12 Start of Spring Semester
13 Start of Spring Semester
14 Current Data
15 Current Data
16 Repeatability
17 Remaining Tasks
18 Accurately Determine Acceleration Sensitivity Most important task to achieving compensation Data processing and noise filtering have paid off New accelerometers to move forward Test each axis and superimpose compensations Accelerometer Output Attenuation Equation: Γ = Acceleration Sensitivity F o = Oscillator Frequency m = Frequency Control Curve Slope S = Accelerometer Sensitivity
19 Investigate Magnitude of EM interference Solenoid produces large EM field while shocking the VCSO Has obvious effect on accelerometer May also affect VCSO output
20 Investigate Magnitude of EM interference Solution: Shock the VCSO manually
21 Secure Oscillator Firmly to Shock Tower To remove all acceleration other than shock pulse Currently using hand to hold oscillator Inconsistent Temperature Future options: Clamps Cloth/Leather Strap Introduce as little resonance as possible
22 Implement New Equipment SMD capacitors and resistors for ADXL evaluation board filters New shock tower ADXL377 3-axis Evaluation Board 3-axis Accelerometer/Oscillator Mount
23 Equipment to Buy ADXL Evaluation boards To replace current faulty one To test in 3 axis $90 each TLC2262CP Operation Amplifiers For 3 axis expansion Low noise $2.08 per chip 2 op amps per chip
24 Circuits to Implement Compensation test circuit Potentiometers for fine tuning attenuation level Operates around 1V on the VCSO control input Switches to toggle compensation Will be expanded to accommodate 3 axes Overall gain determined by VCSO acceleration sensitivity
25 Circuits to Implement Rational for 1V Operation Point: Most linear point on the control input Still not completely linear Non-linearity limits compensation
26 If time allows: Study delay mismatch Isolate each element and estimate its delay Greater delay decreases compensation Large delay could make compensation impossible Study other possible acceleration sensitivity factors, requiring higher filter orders Vibration Frequency dependence Resonance Control Voltage Temperature Further Study
27 Verification and Documentation Verify compensation at Phonon on larger equipment Calibrated accelerometers and vibration tables Phase noise measurements on spectrum analyzer Random vibration Record compensation levels and other data Interpret results Compose Final Paper Demonstrate at Senior Design Day and Phonon
28 - Recap Objective and Operation of Device - Tuning voltage used to regulate frequency output. - VCSO requires stable frequency output. - When VSCO is shocked the output of the device is shifted by a certain phase. - Phase instability causes frequency domain noise. - Objective is to suppress this noise with appropriate low pass filter.
29 Why stable frequency needed For example, in communication system a voltage control oscillator is used to create a stable frequency reference for passing information to a required frequency band. - Phase lock loop - Computer disk - Wireless electronics - Timers - Clock and data recovery
30 What are our Goals Continue to improve compensation by applying digital filter in matlab Apply 3 axis testing using triple axis mount provided by Phonon to further improve compensation if single axis compensation proves inadequate. Design analog filter according to digital model to provide final compensation. Test analog filter to see if compensation is in the range of 20db Assemble conclusive thesis for final presentation.
31 Timeline Budget: All Equipment Provided through Phonon
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