13.271.7Bibliography 1. Larminie, J.; Dicks, A. Fuel Cell Systems Explained, 2nd Edition, Wiley, West Sussex, England, 2003. 2. Los Alamos National Laboratory fuel cell website, http://www.lanl.gov/orgs/ee/fuelcells/index.shtml, accessed February 2008. 3. J. M. Keith, “A Student-Driven Enterprise in Fuel Cells and Alternative Fuels,” ASEE Conference Proceedings, 2004. 4. J. M. Keith, K. C. Opella, M. G. Miller, J. A. King, G. D. Gwaltney, C. A. Green, J. S. Meldrum, and S. A. Bradley, “Engineering Education in Alternative Energy,” ASEE Conference Proceedings, 2006. 5. J. S. Meldrum, C. A. Green, G. D. Gwaltney, S. A. Bradley, J. M. Keith, and T. F. Podlesak, “Fuel Cell Powered Unmanned
. U n i v e r s i t y K a t e G l e a s o n C o l l e g e o f E
the smallest size drive, rated at230 volts and 1 hp. The current price for these drives is $235,which meant we could buy drives for all eight workstations forless than the price of a single “name brand” drive. The drives arepulse-width-modulated, IGBT drives and are fully-featuredincluding simple volts/hz control, sensorless vector control withautotune, and adjustable acceleration/deceleration ramps withlinear and S-curves, among others. The drive has an RS485 portfor communications that can be configured for ethernetcommunication with an optional interface. The drive is relativelycompact, measuring less than 5" wide, 7" tall, and 6.5" deep.The drive can be configured using the human interface module(HIM), which is mounted at the top, right
create accuratemathematical plots on-the-fly, and dynamically manipulate graphical content to emphasizepoints of discussion.This paper is about realizing that potential for the purpose of teaching the relationships betweencontinuous-time (C-T) and discrete-time (D-T) systems. This is an area that requires a teacher topresent several different types of plots – time-domain response plots, frequency-response (e.g.,Bode) plots, and pole/zero maps in the s-plane and z-plane – and to discuss their inter- Page 13.1030.2relatedness.Certainly, there are problems using computers to create plots “on-the-fly” in the classroom, e.g.: ‚ delays resulting from
concepts inmodeling of mechanical systems in the ME undergraduate curriculum. Likewise, this conceptaligns with the topic of vibration modes of mechanical systems14. The transfer function modelfor creep in terms of the spring and damper elements is13,15 N y ( s) 1 1 Gcreep ( s ) ? ? -Â , (5) v( s ) k 0 i ?1 sci - k iwhere ki and ci are the spring and damper constants, respectively [see Fig. 3(a
-equilibrium equation of the link about its other end. E In the hypothetical sub-mechanism, Figure 3, this means that B j is determined from the moment-equilibrium equation of link i about H E E E E ÂM js h ? Ri · B j - Rgi · fi - qi ? Ri e jsi · B j e j - Rgi e jsi · fi e ji i - q i ? Ri B j sin*s j / s i + - Rgi f i sin*i i / s i + - q i ? 0 (15) Therefore Page 13.101.8
those deviations that are significantlydifferent (in a statistical sense) from normal variation in the measurements are worthcorrecting. Thus we need a criterion to determine what constitutes c"ÒtgcnÓ"fgxkcvkqp"cpf"what is just random variability in the measurement.A Shewart chart (see Figure 1) is the most basic tool for determining which variations aredue to a fundamental shift in the process variable and which are merely measurement o u t l i e r f i r s t d e t e c t i o n o f d
consisted of five sequential lab activities in five consecutive weeks: the studentswere required to: 1) calibrate the level sensors and the pump; 2) model the coupled-tanks process with a transfer function; 3) obtain a closed-loop transfer function that satisfies the system performance requirements; 4) determine the controller’s transfer function Gc(s) and convert the transfer function into a difference equation that can be implemented as a digital controller on a computer; and 5) integrate the controller with the sensors, the pump, and the coupled-tanks apparatus to test and analyze the entire system’s performance.Each of these five activities is detailed in subsequent sub-sections. To help the students visuallyunderstand the
measure angular velocity yabout the z direction (pointing out of the page). Page 13.1054.4ii Background on accelerometers can be found in 5.iii A rate gyro works by measuring Coriolis acceleration. For more on rate gyros, see 6. y Path Traversed by Point P a2 ay s a1 s
. T Tclosed Open Is = 0 Figure 8: Control waveform Closed Vs = 0 Figure 7: Switch states Tclosed Ps = I s ⋅ V s = 0 (1) %Duty = ⋅100% (2) TFigure 9 is a discrete time PWM generator circuit implemented in the FPGA. The REG blocksare each registers. Registers store the increment value and threshold value IncVal and ThHold,respectively. The Phase value is represented with N p
mechanicalengineering programs1,2. It is common for the content of such a course to begin with particledynamics. For such analyses the student need only know the mass of the particle(s) involved;usually given in the problem. The course content progresses to rigid body dynamics. With theintroduction of rigid bodies, an understanding of the distribution of the mass within the body isrequired. Typically, however, that said distribution is again given or is readily determined. As aresult, students tend to view the inertial properties of a body as a trivial input to a mathematicalproblem; similar to the length of a connector or the mass of a component. In reality, determiningthe inertia properties of a real structure can be quite challenging.The project presented
displacementcharacteristics but change the design parameters including the radius of the cam base circleand/or roller radius. In the following, appropriate equations are introduced for the calculation of t for each type of the follower. Then, the required design conditions are suggested to preventundercutting.Flat face follower – For the case of flat face followers, the radius of curvature for each value ofcam rotation s is calculated from the following equation5,6: a t ? R0 - s - (1) y2where R0 presents the radius of the cam base circle, y is the cam angular velocity, and s and apresent
xj 1 010 6 Mx j 5 0105 0 0 10 20 30 xj 4Required shear strength: Vu ? 7.685 · 10 lbf 5Required moment strength: M u ? 6.339 · 10 ft© lbf2. Design for moment:Selected beam width: b w ? 22in Selected beam overall thickness: h = 36 in 2Required area of steel: A s ? 4.516in
) Amplifier output current (±50 mA max) Given Kq Servo-Valve Flow Gain (ft3/s/mA) Measured β/ Vt Hydraulic Oil Bulk Modulus (lb/in2)/ Calculated Volume of oil trapped between servo-valve control ports (in3) Kce Total Flow-Pressure Coefficient (in3/sec/psi) Calculated A Area of Cylinder Bore – Area of Cylinder Rod (in2) Measured Kamp Servo-Valve Amplifier Gain Given Kp Proportional Gain Input M Moving Mass (lb●s2/in
AC 2008-1419: KANSAS STATE UNIVERSITY’S ELITE SCHOLARSHIPPROGRAM:ENHANCING LIVES THROUGH TECHNOLOGY ANDENGINEERINGRaju Dandu, Kansas State University at Salina Raju S. Dandu is the program coordinator and professor of Mechanical Engineering Technology at Kansas State University at Salina. He teaches courses in CNC Machine Processes, Material Strength and Testing, Advanced CAD/CAM, Industrial Instrumentation and Controls, and Automated Manufacturing Systems II. He is active in offering workforce training in reliability centered maintenance, CE certification, process instrumentation and PLCs. His areas of interest are: Product risk analysis, Reliability Centered Maintenance, Energy Efficient Lighting
analytical modeling of semiconductor devices and sensors, and electronic instrumentation and measurement.Joshua Ward, Fairchild Semiconductor Josh Ward was a senior level Electrical Engineering student at the University of Southern Maine and was working as a Thin Films Process Technician at Fairchild Semiconductor Corporation, S. Portland while working on this project. He will complete his coursework and graduate from U.S.M. with a B.S. degree in Electrical Engineering in May 2008. Upon graduation he expects to be promoted to Process Engineer at Fairchild Semiconductor. Josh’s interests are semiconductor device fabrication, CMOS integrated circuit design and automated testing.Robert N
provided in [50].Expected Impact Table 1 shows the possible impact on different audiences in different settings and environments. Theefficacy of the program discussed in this paper is based on teaching at the undergraduate/graduate(formal) and K-12 (informal) levels. It may be pointed out that no formal education research wasconducted to generate the Table 1. Thus, the data provided here is qualitative and is based on theassessment of instructors, parents and other professional observers (one of the observers had a doctoratein education). Table 1 Learning level (Basic, Intermediate, Advance), underlying STEMS areas (S, T, E, M), expected impact (Low,Normal, High), learner interest (Low, Normal, High), possible audience types (Families
) A respect for diversity and a knowledge of contemporary professional, societal and global Outcome 10 issues (ABET 2.j ) Outcome 11 A commitment to quality, timeliness and continuous improvement (ABET 2.k) The application of circuit analysis and design, computer programming, associated software, Outcome 12 analog and digital electronics, and microcomputers to the building, testing, operation and maintenance of electrical/electronic(s) systems. (ABET 8.a) The application of physics or chemistry to electrical/electronic(s) circuits in a rigorous Outcome 13 mathematical environment at or above the level of algebra and trigonometry. (ABET 8.b
1 A c tiv a t io n L e v e l, tf 0 .5 0 0 2 4 6 8 10 12 14 16 18 20 22 0 .1 P o s itio n x ( m ) 0 .0 5
. 49,806-812.2. Lightfoot, E.N. and Moscariello, J.S. (2004). Bioseparations. Biotechnology and Bioengineering 87, 260.3. Bonnerjea, J., Oh, S., Hoare, M., and Dunnill, P. (1986). Protein purification: the right step at the right time.Bio/technology 4, 954.4. Ward, W.W., Swiatek, G.C., and Gonzalez, D.G. (2000). Green fluorescent protein in biotechnology education.Methods Enzymol. 305, 672-680.5. Bes, M.T., Sancho, J., Peleaot, M.L., Medina, M., Gomez-Moreno, C., and Fillat, M.F. (2003). Purification ofcolored photosynthetic proteins for understanding protein isolation principles. Biochem. Mol. Biol. Educ. 31, 119-122.6. Sommer, C.A., Silva, F.H., and Novo, M.R.M. (2004). Teaching molecular biology to undergraduate biologystudents. Biochem. Mol
all students will attend class on the day the course surveysare administered; however, we are considering web-based alternatives to attempt to get 100%.All measurements are normalized to the range 1 - 5, with five meaning “good” and one meaning“poor”. These are then aggregated and are entered into the Assessment Results spreadsheet. Aportion of the spreadsheet for fall 2006 is shown below. Ave % 5's % 4's % 3's % 2's % 1's 5's 4's 3's 2's 1's Comments Page 13.1411.6 B.1.a 3.5 23.5 17.6 47.1 11.8 0.0 4 3 8 2 0 Req - SE 4330 Assess B.1.b 4.6 56.3 43.8
increasingly used as a safety management tool in the nuclear power industry through the 1980’s and 90’s. This capability is of central importance in the domestic nuclear power industry in the new century. PRA provides answers to four important questions: (i) What can go wrong? (ii) How likely is it? (iii) What are the consequences? and (iv) How do uncertainties impact the above answers? There are three levels of PRA analysis in the commercial nuclear power industry: Level 1, Level 2, and Level 3. Level 1 consists of an analysis of plant design and operation focused on the accident sequences that could lead to a core damaging event, their basic causes and their frequencies. Key figure of merit is the Core Damage
AC 2008-499: INTEGRATING APPLICATIONS IN THE TEACHING OFFUNDAMENTAL CONCEPTSPatricia Campbell, Campbell-Kibler Associates, Inc Patricia B. Campbell, President of Campbell-Kibler Associates, Inc, has been involved in educational research and evaluation with a focus on science, technology, engineering and mathematics (STEM) education and issues of race/ethnicity, gender and disability since the mid 1970's. Dr. Campbell, formerly a professor of research, measurement and statistics at Georgia State University, has authored more than 100 publications.Eann Patterson, Michigan State University Eann Patterson taught Mechanics of Solids for twenty years at the University of Sheffield
this paper clearly indicate the learning opportunities provided to the students at MUSE. Thestudents also participate in the multidisciplinary senior design projects in their final year. Theeffective use of theory classes, design and manufacturing lab facilities, multidisciplinary seniordesign projects, and co-op opportunities provide the students the needed expertise and preparethem well to meet the challenges in the industrial workplace.References[1] Davis, D. C., Gentili, K. L., Trevisa, M. S., and Calkins, D. E., “Engineering Design Assessment Processes and Scoring Scales for Program Improvement and Accountability,” Journal of Engineering Education, Vol. 91 (No. 2), 2002, pp. 211-221.[2] Dym, C. L., Sheppard, S. D., and
3 3 -S U MAc ? 0 : / MAc / Ä L - 2 L Õ © PL ? 0 MAc ? / 5PL MAc ? 5PL S Å 3 Ö 2 EI 6 EI 6 EIBy rules 9 and 10 in Section II, the slope sA and the deflection yA at the free end A of the actual cbeam in Fig. 3 are, respectively, given by the “shearing force” VA and the “bending moment” cM A at the fixed end A of the conjugate beam in Fig. 4. We write PL2 3 sA ? VA c ? Acy ? yA ? MAc ? / 5PL 2 EI
different operation platforms work together as aswarming group; the organization and function of a swarming team is just like bees or ants. Theindividual intelligent robot can run in either autonomous mode or cooperative mode. Normally, there isone or more ground station(s) to coordinate and initiate the swarming team. The path planning andobstacle avoidance will become a part of formatted cooperative team work. The communication between the ground station(s) and individual intelligent robots has beendeveloped in a systematic manner in the past decade. However, there is no convinced and reliablephysical communication means between individual robots available. And the fact of that there isn’t anymethodology of information exchanging between
- questionnaires.TABLE 1: Multiple–choice results collected from questionnaires given before theworkshop. The results indicate the percent value for each answer.1. A car is moving along a horizontal highway in astraight line at a constant rate of 25 m/s. Itsacceleration is 47 [A][A] 9.8 m/s2 0 [B][B] 9.8 m/s. 41 [C] – correct answer[C] zero. 12 [D][D] 25 m/s.2. A ball is thrown straight upward. What is theacceleration of the ball at the highest point?[A] zero 53 [A][B] 9.8 m/s2 , upward 12 [B][C] 9.8 m/s2, downward
-basedapplication. Using Clearsighted, Inc.’s tools, an ITS was constructed that required nomodification to the original authoring tool. The resulting ITS provides immediate feedback in atutorial setting, offering help when requested and adaptive just-in-time messages, as well asnoting incorrect actions. All of this feedback, from the user’s point of view, seemingly comesfrom the authoring tool. A series of tutorials have been developed that will provide guidance tonew users as they develop online homework assignments. Evaluation of the system is done bycomparing authoring tasks performed by groups who learned to author without using theintegrated system to groups performing the same tasks with the ITS.IntroductionMost activities related to engineering
students and faculty in a variety ofscience and engineering fields. The paper focuses on engineering at colleges and universitiesbecause of the role which these institutions have in inspiring both women and men to chooseengineering as a field, and their potential to change the composition and size of the futureworkforce. Findings include that for fields dominated by men in the 1960s 1) those fields withthe highest (or lowest) proportions of women students in the 60’s still have the highest (orlowest) proportions of women students today, and 2) the proportion of women students is highlycorrelated with the proportion of women faculty in a field. This may suggest that increasing thenumber of women faculty may be a strategy for more rapidly attracting
StudyFigure 1 depicts a schematic of the simulated system. An object with mass, m, is locatedon a flat surface. One edge of the surface is lifted up to form an angle, α, with the ground.The static friction coefficient, µ s, is given. The purpose of this test is to determine theangle of inclination when the object starts the motion by using a digital simulation tool. m = 100 kg µ s = 0.6 Fw = mg α Figure 1. Object on inclined surfaceLMS.Imagine.Lab 7b is used to simulate the system6. In the mechanical library thereexists a component called “linear mass with 2 ports and friction”. The user