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07 - ENGR 201 Evaluation Presentation of Experimental Data...

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5/10/2011 ENGR201 Lecture 7 Spring 2011 1 ENGR 201 Evaluation & Presentation of Experimental Data Lecture 7 Calculations for Lab 5 and Measurement of Angular Velocity T. Chmielewski, Electrical & Computer Engineering D. Miller, Mechanical Engineering & Mechanics Drexel University 5/10/2011 ENGR201 Lecture 7 Spring 2011 2 Announcements On Line Quiz this week – same process as before Final Exam Information Date: June 7, 2011 Time: 13:00-15:00 Location: unspecified If there is interest Dr. Chmielewski will hold a problem review session before the final 2
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5/10/2011 ENGR201 Lecture 7 Spring 2011 3 Reading and Homework -1 • Reading – Section 12.2, pp 522 - 525 in text – Go to Wikipedia and look up shaft encoder then read about incremental rotary encoders – In anticipation of your cyclometer project, read Context Help for DAQmx Base Create Virtual Channel VIs CI Cnt Edges VI - Counter Input Count Edges function CI Period VI - Counter Input Period function 5/10/2011 ENGR201 Lecture 7 Spring 2011 4 Reading and Homework - 2 Problem 12.13 from the text. A magnetic pickup is used to detect the shaft speed of an experimental high speed compressor. A gear with 12 teeth is used to excite the sensor. If the shaft is turning at 18,000 rpm, how many positive pulses will be created per second? By what number must the number of counts in a second be multiplied to produce a result in rpm? A strobe based tachometer is shining at a disk rotating at 2400 rpm. The disk has one circumferential marks for speed measurements. – a. How many marks will you see if the strobe flashing rate is 1200 per minute. – b. Repeat part (a) for flashing rates of 800, 2400, 4800, and 7200 flashes/min.
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5/10/2011 ENGR201 Lecture 7 Spring 2011 5 Format for this lecture Background Theory to perform Time Constant computations for Lab 5 Measuring Angular Velocity Preparation for final project -cyclometer 5/10/2011 ENGR201 Lecture 7 Spring 2011 6 6 Lab 5: Capturing Temperature Measurements from a Thermocouple Lab Goals – Build a subVI for voltage to temperature conversion – Measure, plot and record temperature measurements from a Type K thermocouple Correct the measured voltages with a calibration curve (polynomial) – Find the time constants of the thermocouple cooling curves
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5/10/2011 ENGR201 Lecture 7 Spring 2011 7 7 Capturing Temperature Measurements from a Thermocouple The measurement – Insert the TC into a power resistor – Apply voltage to cause the resistor to heat up – When at steady-state temperature , remove the TC and allow it to cool (in free space) – Record temperature data with time while the TC is cooling the result is an exponential decay similar to the graph on next slide. 5/10/2011 ENGR201 Lecture 7 Spring 2011 8 8 Sensor Cooling Curve t = 0 Sensor pulled from resistor What is the final temperature that you would expect?
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