Transcript MECH 322 Instrumentation Lecture 42 Miles Greiner Goals Course Evaluation Possible Elective Course • MSE 467: Radiation Detection and Measurement – Professor N.

MECH 322 Instrumentation
Lecture 42
Miles Greiner
Goals
Course Evaluation
Possible Elective Course
• MSE 467: Radiation Detection and Measurement
– Professor N. Tsoulfanidis [email protected]
• TuTh 5:30-6:45 PM, LME 316
• Pre/Co-requisites:
– Interest in Nuclear Energy
– MATH 181
• Textbook:
– Measurement & Detection of Radiation, N. Tsoulfanidis
and S. Landsberger, 3rd Ed, CRC Press (2010); ISBN-10:
1420091859
Lab Practicum Finals
• Start this afternoon
• Guidelines
– http://wolfweb.unr.edu/homepage/greiner/teaching/
MECH322Instrumentation/Tests/Index.htm
• Revised Schedule
• Starts at 4 PM Today
• See next page and WebCampus
Finals Schedule
Career Overview Survey
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Name (not necessary)_________________________________________________
What year did (or will) you:
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What will you do this summer (can chose more than one)?
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Work
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___________ ME-related job (where ___________, on-campus___________)
___________ “Non-ME” job
___________ Did the College’s internship/placement program help?
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Volunteer
Summer school
Other (military, …)
Don’t know
What can the Department do to help qualified students complete their degrees more quickly?
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Graduate High School
Enter UNR
Take your first Calculus Class
Enter ME Department
Plan to graduate with a BS degree
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What are you thinking about doing after graduation (can chose more than one)?
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___________ ME-related job
___________ Non-ME job
___________ Graduate School
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___________ ME at UNR
___________ UNR’s accelerated BS/ME program
___________ ME elsewhere (where ___________)
___________ Non-ME (what ___________)
___________ Something else (what ___________)
Course Objectives, Overview & Evaluation
• Observe and measure important physical
phenomena, and compare to expectations
– Manometer fluid movement, Hydrostatic pressure head
– Beam bending, strain, elastic modulus, density measurements
• Steel and aluminum
– Bernoulli fluid pressure variation with speed
• Venturi tube and Pitot probe
– Boiling water temperature dependence on atmospheric pressure
– Seebeck effect
• Thermocouples produce measureable repeatable voltage at junctions of dissimilar
metals
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Heat transfer coefficient depends on fluid conductivity
Predictable beam vibration frequency and damping
Karman vortex frequency
Feedback control (full on/off, proportional, integral)
Errors in processing time-varying signals caused from noise and aliasing
Predicted, Unpredicted, and “Unpredictable” behaviors
• In lab we sometimes observe things we did not expect
• Requires reinterpretation and/or troubleshooting (can be interesting)
Develop “comfort” using instruments,
data acquisition and control systems
• Understand theory of operation and possible
errors of specific devices
– Electronic pressure transmitters, Monometers
– Strain gages, Strain indicator bridge
– Pitot probes, Venturi, Hot film anemometers
– Thermocouples, signal conditions, LM35
– myDAQ and LabVIEW
– Accelerometers
– Digital Relays
– DMM, micrometers, rulers, scales…
Develop Good Lab Practices
• Prepare for measurements before conducting them and
allocate sufficient time to performing them
– Use mathematical models to predict behaviors, to the extent possible
• Troubleshoot hardware, computer and software problems
• Perform steady and transient measurements, and understand
potential errors
– Bias (calibration)
– Random (not repeatable)
– Transient (instruments require time to respond)
• Communicate
– Use clear tables and charts to present engineering data
– Analyze and draw conclusions based on data
• Engineering understanding begins after the measurements (or calculations)
are completed
• Practice reduces “stress” of doing experiments
– Helps students to find them “rewarding” and a possible career path.
To Focus on Objectives, course has
• Reasonable work load
• Each Lab had Stages
– Clear handouts and lectures (I tried!)
– Web Site – access to required and supplemental materials
– Lab Preparation Homework and Sample Reports
• Help students know what is expected
• Reduce lab-time confusion
• Do these make the lab too easy?
– LabVIEW programming by example (not theory)
– Write reports in lab:
• Analyze soon after data acquisition (allows re-acquisition)
• Gives student access to instructor help
– Bulleted conclusion format
• Outlines formal reports (prepare for senior year)
• Structured Extra-Credit opportunities (~3%)
Next Year
• Use Differential fees to
– Offer LabVIEW to students for no or limited-cost
• Prepare LabVIEW at home
– Offer to check out “Labs-in-a-Box” from DeLaMare Library,
containing myDAQ, equipment, sensors and signal
conditioners for Thermocouple and Beam Vibration Labs
• Boiling Water Temperature, Transient TC, and Control, and Vibration labs
• Use in ECC, DeLaMare or at home
• Removes time constraints and gives students more
unstructured time with the equipment to
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Troubleshoot programs before labs
Practice for final
Use in other classes or projects
Explore programming and equipment
• Potential cost, breakage and liability problems
Feedback
• Did you like ?
– Lab preparation problems
– Finishing labs in three hours
– Lectures slides on web
• Were the lectures
– Too detailed (waste of time)
– Just right (Clear and helpful)
– Too vague (can’t understand)
• What about the mathematical lectures?
– Transient Thermocouple, Beam vibration, controls
• Were the lab assistants able to help you, or did they solve too
many problems for you?
• Was the lab too structured
– Would you have liked more time to explore things?
• Would you like to see more low-priced chip-based transducers
that you can buy online and use on your own?
Feedback
• E-mail ([email protected])
• Please do the evaluation now
• www.unr.edu/evaluate
New 2015
• Elastic modulus and density of Steel and
Aluminum beams
– Next year purchase stain gases with attached leads
• Measure beam vibration for two beam lengths
ABET Student Learning Objectives
• This course is designed to help Mechanical
Engineering students develop abilities to:
– Apply knowledge of mathematics, science, and
engineering
– Design and conduct experiments, as well as to
analyze and interpret data
– Identify, formulate, and solve engineering problems
PART I A: EVALUATION OF THE INSTRUCTOR
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The instructor was effective in facilitating learning in the classroom
The instructor was well prepared and organized
The instructor encouraged student questions and participation in class
The instructor was available and helpful outside of class
The instructor demonstrated a thorough knowledge of the course content
The instructor provided a clear course syllabus and completed the course objectives
Exams and assignments were appropriate and covered the course content and objectives.
The pace and amount of work required for this course were appropriate
PART I B: COURSE INFORMATION AND EVALUATION
1. The textbook and handouts contributed to your learning
2. The audiovisual materials used in the classroom contributed to your learning
3. The computer resources were adequate and were effectively incorporated into teaching
4. The classroom environment was conducive to learning
5 Statistical Methods Labs
1. UNR Quad Measurement
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Find grass seed cost and uncertainty, very practical
2. Quad Data Analysis
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Mean, St. Dev (Data Exclusion, Correlation Coefficient)
Wide range of results highlights need for calibration
3. Monometer Calibration
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Calibration removes bias
Standard Deviation of output and input quantifies impression
4. Strain Gage Installation
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length error estimates
5. Elastic Modulus Measurement
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Uncertainty in best fit slope
Propagation of error, compare calculated to literature value
Written Midterm
3 Steady and Data Acquisition Labs
6. Air Speed and Volume Flow Rate
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Use pressure transmitters, check consistency
Propagation of error
7. Steady Temperature of Boiling Water at Elevation
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TC, signal conditioner, LabVIEW, compare with
prediction
8. Numerical Differentiation and Spectral Analysis of
Unsteady Signals
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Sampling Rate Theory, Time derivatives
Demonstrate unsteady data processing errors and
solutions
Written Midterm
4 Unsteady Measurement Labs
9. Transient Response of a Thermocouple
– Heat transfer in water and air (effect of kFluid)
– uncertainty
10. Vibration of a Weighted Cantilever Beam
– Natural frequency prediction and damping
– uncertainty
11. Karmon Vortex Unsteady Speed
– Dynamic measurement and spectral analysis
– uncertainty
12. Temperature Feedback Control
– Analog output, digital relay, logic
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Lab Practicum Final
Evaluation
ME Curriculum has 14 outcomes
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The course increased my ability to apply the principles of
mathematics, science, and engineering
Instrument models, dynamic response of TC, vibrating beam, error analysis
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The course increased my ability to conduct and design experiments,
as well as to analyze and interpret data
Focused on understanding and performing experiments
3.
(not applicable) The course increased my ability to identify and document
desired needs and to design a system component, or process to meet
desired needs within realistic constraints such as economic,
environmental, social, political, ethical, health and safety,
manufacturability, and sustainability
4.
(not applicable) The course increased my ability to function on
multi-disciplinary teams
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The course increased my ability to identify, formulate, and
solve engineering problems
Lab experiences require interpreting measurements, dealing with
unexpected results, and troubleshoot problems
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(not applicable) The course increased my ability to explain
professional and ethical responsibility and identify professional
and ethical issues
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The course increased my ability to communicate effectively
Quantitative engineering communication using tables and charts
Draw bulleted conclusions from data
Abstract of results
Formal citations
Evaluation (cont)
8.
(not applicable) The course enhanced my broad education
necessary to understand the impact of engineering solutions
in a global, economic, environmental, and social context
9. (not applicable) The course increased my ability to explain
the need for, and an ability to, engage in life-long learning
10. (not applicable) The course increased my ability to identify
and analyze contemporary issues
11. The course increased my ability to use the techniques,
skills, and modern engineering tools necessary for
engineering practice
Modern measurement instrumentation
Computer Data Acquisition and Control program
12.
The course increased my ability to apply the principles of
science, including chemistry and calculus-based physics, in
the identification, formulation, and solution of engineering
problems; with depth in at least one of chemistry or calculusbased physics knowledge domains.
Newton’s law analysis: Vibrating beam
First law analysis: Dynamic response of thermocouple
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14.
(not applicable) The course increased my ability to apply the
principles of mathematics and computational methods, including
multivariable calculus and differential equations, in the
identification, formulation, and solution of engineering problems.
The course increased my familiarity with statistics and linear
algebra.
Sample mean, standard deviation
Linear Regression,
St Dev of fit,
Propagation of Error
New 2014
• Detailed Lecture Slides with Examples on
the White Board
– Corrected after each lecture
– Updated nomenclature, consistent with lab
instructions
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Lab 3, Pressure Standards
Fully integrated myDAQ’s into labs
Lab 10, Time-dependent decay constant
Lab 12, Integral Control