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Automated Maze System Development

Automated Maze System Development. Group 9 Tanvir Haque Sidd Murthy Samar Shah Advisors: Dr. Herbert Y. Meltzer, Psychiatry Dr. Paul King, Biomedical Engineering. Introduction. Microdialysis Method of measuring physiological activity during task

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Automated Maze System Development

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  1. Automated Maze System Development Group 9 Tanvir Haque Sidd Murthy Samar Shah Advisors: Dr. Herbert Y. Meltzer, Psychiatry Dr. Paul King, Biomedical Engineering

  2. Introduction • Microdialysis • Method of measuring physiological activity during task • Dr. Meltzer’s Lab uses it to study brain activity during memory tasks

  3. Experimental Setup • Rat hooked up to Microdialysis • Rat placed in Maze, performs memory tasks • Sample collected during maze run • Sample Analyzed for content

  4. Problems • Dialysis tubes’ entanglement • Rat’s recognition of overhead device  psychological repercussions • Manual guiding of tubes cumbersome for researcher

  5. Constraints • Maze Dimensions • Rat Size • Rat Speed • Rat Cognition • Tube Length • Dialysis Weight Depth: 18”

  6. Primary Objective • To develop a fully independent research module that facilitates the study of memory.

  7. System Description

  8. Position Acquisition

  9. Image Processing Acquire Image Calibrate the Image Convert the 32 bit image to an 8 bit image Pattern Match to a Specified Image Filter Image 2: Remove Small Objects Filter Image 1: Remove Border Objects Output Physical coordinates in array form Determine the pixel at the center of the pattern Translate pixel value into physical coordinates

  10. LabView Software Code

  11. Image Processing Unprocessed Image Processed Image

  12. LabView Screen Shot

  13. Motorola 68HC11E One 8-bit input Low cost On board A to D converter NI PCI-7342 Four 8-bit inputs More processing capabilities Software Compatibility with LabView Choosing a Microprocessor

  14. Processing the Information • Continually Given one set of coordinates (X,Y) • Compares the coordinates of (Xn-1,Yn-1) to (Xn,Yn), computes the difference, and rounds the significant digits • Converts the difference into specified timed waveform for the driver • Driver amplifies signal and controls motor speeds

  15. Drive System • Lead-screw Device • Relatively Easy to build • Not very efficient • Cheap • Pulley/Belt System • Complicated System • Efficient • Expensive • Mounting Issues

  16. The Lead-Screw Device • Motor Driven • Rotational Energy converted to Linear Energy

  17. Device Apparatus

  18. Device Apparatus • Driven by dual motor system • Translation responds to mouse movements • Open Loop Feedback

  19. Choosing a Motor • Design Considerations: • Speed of Mouse: roughly 2 ft/s • Torque • Torque needed to drive apparatus • Torque needed to provide acceleration • Stepper Motor or DC Motor?

  20. Speed RPM = 25.5 in/s / Lead*60 s/min Target RPM Range 3000 -12000

  21. Torque • Driving Torque • Driving Torque • Driving Torque L = 2.37 lbsP = .5 in/revef= .4 (for ACME) Tf = 53 mNm • Acceleration Worst Case Scenario 25 in 2 ft/s Position I = 0.001207 lb-in-s2α= 265 rad/s2 T = 36 mNm -25 in Time

  22. Stepper or DC? • Stepper • Torque < 3.53 Nm • RPM < 2000 • DC • High Torque • High RPM

  23. DC Motor • 3000 RPM (using 0.5 lead) • 87 mNm Torque • Powered by Driver • Monitored by external Optical Encoder

  24. Calculate Δ(x,y) Calculate Δ(x,y) Micro-Processor Micro-Processor Image Image Motor Translation Motor Translation Driver Driver Flow Chart

  25. Budget

  26. Departmental Reconsiderations • Budget limitations caused the psychiatry department to reconsider the value of the experiment • Design was put on hold until further notice

  27. Contingency plan • Develop a model which represents fundamental principles of design • Image acquisition system – LabVIEW software • Mechanical arm system – Erector set

  28. Overall Status • Project on hold • Next step: Develop Theoretical Model

  29. Conclusion • Though no tangible design will be developed, a better understanding of image acquisition systems, micro-processing and linear actuators was obtained • With the development of the theoretical model, the perceived design was realized and used for its educational purposes

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