Conference Session

Laboratory Experiences in Electronics and Circuits

Collection

2013 ASEE Annual Conference & Exposition

Authors

Tooran Emami Ph. D., U.S. Coast Guard Academy ; Richard J. Hartnett P.E., U.S. Coast Guard Academy

Tagged Divisions

Division Experimentation & Lab-Oriented Studies

methodologies. In this paper is the extended of ourlaboratory 4 in Linear Circuit course at the U.S. Coast Guard Academy.The current paper presents some of the successful design and compensation techniques from onelaboratory in a junior-level Linear Circuits class that reinforces student learning about finitegain-bandwidth product limitations. Students learn graphical technique in the classroom thatpredicts the impact of Gain-Bandwidth Product limitation of a µA741op-amp.In this lab, students are asked to design two Sallen-Key second order low pass sections, using aµA741op-amp, in order to meet two specific resonant frequencies. In their first design( f o = 72.3 kHz and Q = 2) , students typically fall short of the desired resonant frequency by15% or

Conference Session

Laboratory Experiences in Electronics and Circuits

Collection

2013 ASEE Annual Conference & Exposition

Authors

Avik Dayal, Virginia Tech; Kathleen Meehan, Virginia Tech; A. A. (Louis) Beex, Virginia Tech

Tagged Divisions

Division Experimentation & Lab-Oriented Studies

filter for the POTS application with a 400 to 3400 Hz passband. A good approach tothis problem was to design two cascaded filters that had different center frequencies andbandwidths while keeping the Q constant (ratio of center frequency to bandwidth) of thecascaded filter sections the same; this normalization maintains the shape of the (Bode plot)magnitude response when the center frequency is varied over the (Bode plot) logarithmicfrequency scale. Once students realized this, they could adjust their design until they met thespecifications of their filter. In many design results, students designed for two filter sections thathad center frequencies close to the cutoff frequency specifications of the filter. For instance, onesample design had two

Conference Session

Laboratory Experiences in Signal Processing and Controls

Collection

2013 ASEE Annual Conference & Exposition

Authors

Ding Yuan, Colorado State University - Pueblo

Tagged Divisions

Division Experimentation & Lab-Oriented Studies

AREA 40cm 15cm 15cm RED AREA Figure 3: The working area layout of the projectAs Aristotle19 mentioned, “the kind of questions we ask are as many as the kinds of things whichwe know,” the students deepened their understanding of the problem through these Q&Asessions. And the importance of understanding the problem in a design procedure wasstrengthened during the discussion as well. Then, a more detailed project description was givenas: design a sorting system to satisfy the following requirements: 1. The whole system (except arms/sensors) should be placed in the shaded green area in

Conference Session

Laboratory Experiences in Mechanical, Materials and Thermal Systems

Collection

2013 ASEE Annual Conference & Exposition

Authors

Roger A Beardsley PE, Central Washington University

Tagged Divisions

Division Experimentation & Lab-Oriented Studies

10 Effectiveness 50 TotalMET314 Energy Consumption Lab Typical Data & ResultsRoom Lights Data:Assume 35 wks/yr, 10 hr/day x 5 days per week = 1750 hr/yrLocal Electricity E100 Rate = $0.0593/kw-hrEnergy Before, Room 215: 196 bulbs @ 40 W ea = 7840 WCost before = 7.84 kW x 1750 hr/yr x $0.0593/kW-hr = $813.60/yrEnergy After, Room 205 (building remodel): 56 bulbs @ 32 W = 1792 WCost After = 1.792 kW x 1750 hr/yr x $0.0593/kW-hr = $185.96Shower Energy Data:Mass = (10 +- 1 min) x (2.5 +- .5 gpm) = 25 gal x 3.7854 lit/ 1gal x .990kg/lit = 93.69 kgEnergy Q = m Cp dT = 93.69 kg x 4.18 kJ/kg-C x (30 +-2 C) = 11749 kJ = 3.263 kW-hrEstimated Energy Cost =3.263 kW-hr/shower x $0.0593/kw-hr = $0.193 / showerEnergy Cost