annotated-Midterm_ECE%20532_W23-%20Chaitanya%20Sai%20Natra-1 (1)
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University of Michigan, Dearborn *
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Course
ECE 532
Subject
Mechanical Engineering
Date
Oct 30, 2023
Type
Pages
14
Uploaded by DeaconSalamander2665
1 Name: Chaitanya Sai Natra
ECE 532 Midterm Exam Total Points: 200 March 15, 2023; due on Mach 16, 2023 @ 11:59pm NOTE
: For your solutions answer the questions completely showing ALL
your work for full credit. 1.
Fill in the blanks or circle the correct answer (3 pts each) (
75 points)
a.
MEMS
have infiltrated the automated sensor market in both the inlet manifold pressure sensor and airbag accelerometer. b.
Because RTD is a resistor, there is an I
2
R
power dissipated by the device that causes a slight heating effect, a self-heating
. c.
The linear
range of an amplifier is finite, and limited by the supply voltage
and the characteristics of the amplifier. d.
Proximity sensors are usually used as switches
to provide a clear indication when a certain preset distance is reached. e.
RTD
is a temperature sensor that is based on the principle that metal resistance increasing with temperature. f.
The capacitance between 2 plates is determined by three things: 1.
Gap Size 2.
Size of the plates
3.
Materials between the plates
g.
The Resolution
of a coil-type potentiometer is determined by the number of turns
in the coil. h.
F
: The following diagram shows a High Pass Filter. i.
The sensitivity of a Strain Gauge
is described in terms of a characteristic called gauge factor
defined as the unit of change in resistance per unit change in length. j.
Thermocouple: Seebeck Effect
is the conversion of temperature differences directly into electricity. k.
The Critical frequency
is the frequency for which the ratio of the input voltage is approximately 0.707. l.
Gross
errors: these are generally the fault of the person using the instruments. m.
When mechanical stress or strain
is applied to the piezoelectric
material, generates an electric charge and associated potential difference. n.
Passive Filters consists of RCL networks. o.
A Diaphragm
is like a spring and therefore extends or contracts until force developed that balances the pressure difference.
2 p.
Wheatstone Bridge
: The primary application of this bridge in signal conditioning is to convert variations of resistance into variation of voltage. q.
The degree to which the numerical data spread out about the average value is called variation
of the data.
r.
Thermistors
are quite robust and they provide a fast
response time and high
sensitivity. s.
OP-Amps
are electronic devices which are enormous generic use for signal processing. t.
Strain
is the geometrical expressions of deformation caused by the action of stress
on the physical body. u.
Stray Capacitance
–
Any wire in the real world environment has a finite capacitance with respect to ground. v.
AC Bridges
are used mainly to detect changes in inductance and/or capacitance. w.
T
: Concrete has a higher acoustic reflectance than acoustic tile x.
Mechatronics
–
combination of the following disciplines: mechanical, electrical, telecommunication, control and computer engineering. y.
A common use is the Lux(unit)
which measures apparent brightness. 2.
In Lecture 4 material we reviewed a section on thermocouples, describe the Seebeck effect in your own word. (20 points)
Note: list your reference(s) for full credit –
non-peered review articles are ok for this problem. Google searches are ok just make sure you copy the link in your references. Using lecture are ok, but you will need at least one other reference.
References: • https://en.wikipedia.org/wiki/Thermoelectric_effect#Seebeck_effect • https://www.sciencedirect.com/topics/engineering/seeb
eck-effect • https://instrumentationtools.com/seebeck
-effect-theory/ 3.
An Accelerometer has a mass of 50 grams and a spring constant of 2500 N/m Maximum mass displacement is +/- 0.75 in. (before the mass hits the stops). Calculate the maximum measurable acceleration in g. (
20 points
) 4.
For an RTD, discuss in part a. and solve the problem in part b. (20 points) Note: For part a) list your reference(s) for full credit –
non-peered review articles are ok for this problem. Google searches are ok just make sure you copy the link in your references. Using lecture are ok, but you will need at least one other reference.
a)
What are they in detail and discuss their importance?
3 b)
Cons
ider a 300Ω RT
D that is made from Platinum wire. How long is the platinum wire if its diameter is 0.13mm? (ρ = 10.5 µΩ * cm)
Reference: • https://www.sciencedirect.com/topics/engineering/resistance
-temperature-detector • https://www.birkmfg.com/blog/rtd
-sensors-understanding-their-functioning-advantages/ • https://en.wikipedia.org/wiki/Resistance_thermometer#Function • https://www.elprocus.com/a
-memoir-on-rtd-sensors/ 5.
In class, we examined, and automobile cruise control system represented as a block diagram consisting of a “Controller”, a “Plant”, a “Sensor”, and an “Actuator”. (25 points total) a.
Generate a similar diagram for the temperature control for a home (heating or cooling) including all the inputs, feedback loop, output, and the Disturbances. (15 points)
b.
In a sentence or two, explain the logic the controller might use. Is the controller you describe static or dynamic? Explain (10 points)
6.
We have discussed the PID controller in class, Lecture 5. Calculate only the next 3 lines from the table below. Complete at least 1 row
by hand showing all your work for full credit
(NOTE: You can use Excel to check your work and solve the problem. If so, submit your Excel file with the midterm. You can also calculate it by hand. If you calculated it by hand, again you must show hand calculations for at least 1 of the rows
) –
(35 points)
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4 S.NO
Actual speed
Desired engine speed
Error
prop
Int
Derivative
Total
Current throttle position
degrees to move
new throttle position
speed correction
0.01
1200
950
250
-75
-1.25
-50
-126.25
10
-1.2625
8.7375
-126.25
0.02
1073.75
950
123.75
-37.125
-1.86875
25.25
-13.74375
8.7375
-0.1374375
8.6000625
-13.74375
0.03
1060.00625
950
110.00625
-33.00188
-2.418781
2.74875
-32.67191
8.6000625
-0.326719063
8.2733434
-32.671906
0.04
1027.33434
950
77.3343438
-23.2003
-2.805453
6.5343812
-19.47137
8.2733434
-0.194713748
8.0786297
-19.471375
I have neither given nor received unauthorized assistance on this work. Signed: Chaitanya Sai Natra Date: 03/16/2023
The Sebeck fect is ene the threo notbl aftiatiers hat Stond t wnda tho tbasno elbckric ellect T unb give ho rame Themas Bhann Seebeck ahteh tha Oneman phySicbt wihe inderendontly ditvebd ahteh Ho ooneeloctrie fhorernaonn lSa1. in The theroebotruc jecd is ho pROCaBs by Which he tempehtalurs dilteront ketuen tud elodrica onducb o7Semitonductes hat aro nat ompasrab6 is die ornuerted ta tho electric potria/, Thaough an elbctoucas Onnacthon, hado (enduclors wrh ilfebsond otentials m b ortact caudsy a teu chatgc Tn he esde tha porticlss ad a ustont lbw, stuatien, ntheducing a potenhas diliorg o h elbdbucal nduchos wih dilynl pitareilis reSul at huis junden. una dorant un tenpetalut iohak hect othibi a ula thaflomn Which tho applioahion e a huat Souio rokulo in fhe onraien n oloctrical petorhad I i Pobible gaupe his ebctric polshal betuten o "het and Cold" ids jonthbn. on&iden Connuctng tue n-nd p-tp: Samionduclos oq end. Becauls the Gsit nds e hoe hus Sonitenducos hantGur lo Saile he tengoratufs ho likd
adte at dow temyeralutel, a hohmal gradint hopperl,. albdob elocthens t fhe "hot' erd e le n-yp Conducton ablon ound tavl thatmal enu't9y. hsy beconu mote motrvald and g thon a Sobult, (eulahd th "arel end ho Spectruum, 5 a subul fh Cool end has a Jargoh hangs Cantwh density Hhs hot end, Which hab a dour Chargo artien dont (eladzons foh n-byp ad heles fs ptp), he chatge a ko ualid ace dis petsien Caubes an eloctric held the Cornvchen. n a onducleh ib sed b lonnd t tus ends Chatg Stad to or reugh dt Thsro aro hnre forns uin thich ha Sabock ehod may eblsrued: Tue hs mafruals ogthon wih th heo Souic will will funchom as tho gonorator an a dond onnuded achols Ho tuo eds fe paueh ta doad. The Cenperalut dilhorong ketueen tto tus e may be calculalbd from to Voltog eblainnd by a blncb Cornected to oh enb hrough a C9nducl
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mathomaica egpuoiors: V -STh-T Whoe V Pptental dfeno SSesheck Coelciunt ThTomperalus, at het ens TT Tepporalut at ho d cnd. Sv-s(sT) bihito, V Chang in volage, ST-Change in temypeahir dfeng The Seskzck lhiciend dalinad a3 tho aput BUhgo CPuaod beliwen Puo (onducks Whon the Cngenalute achols tham mainairad at l hlrin de ho GosAuatitr Th un Saudard torm
3) Fro th queshion, Mabs (m) = 50g Sphuny (onstand (K) =as0o N/m Marinum mobs displacemod () =t 0. 75 (1 00854 Meda = 0.0190S mly F kx soo)(o.01905 F: t47.625 N F ma a Fm t47-625 0.05 53.5 m/s a 952.S 2 q.81 99. 01 g Macumum meluarabl atcolahahron u 17 'Tho
&) aRTD: Resslana Temperal Delbcter Senben the An RTO Sonbor a tool used to thack he he Chaye n tempehatut an applicatron by moabuing the Chage usistano tho Sernss in rolathlon o (enypetali. fenyetae thargs, Ho RTD `onSek Josiskn vatuis Deending 9n tho ulisiane Cuue ea ekn ay RTD, this Charge in Presistanao prebiabb anad ra be ctsouved to indorhiy ho tompernlite heg RTD Joro?, casurnd by ho The RTp Senlo B made Torern a puiz mebl buch as plalinun, (oppen e nudd, bo b abbt, Vasuiy tenperalieb, plalnu lohaio d beod ib tho pefortod mattua, al tte metal, lalnuo ho Gno hat yiolbg tho mot aucutalo Sroadvgs. Pt1o0, fer nshne Tnpertana i RTO Sondeu povide h Vital tobk teryerduro Senbing un a targ Secles. Whon Lomparudo th temperatores 3rbiy dourtoly R Senbing haNe Peven lo bo amgng tho mef amiwa un tho markt
Thobo Sanbehb du ulehul When mopbuiomod acwracy and Conbi'stency afto nodans
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wwiu ) T (alculat tho sngth h Hatirum u, We necd lo us h rmula fer ho Asisano a wiui R-PL/n Whers R esianto Pfesstvity Platnwm L legth Mo uito A Corel3-Bectienal aroa Ho uike A TE TTCd/a guien d o.13mm A 7(o. 3/ 2 0 0132F mmi 0,01324 xro cm guwen R 300 10.S ML Cm RA P on 0.00371142x1o °on 321, 42 Cm = 300 x 0.0l32Zx10 o,SXto im
5)a) Thes systenm usas a haato/ toler yetem to Mauntaln the tenperalu ho oom Disturbnces Hat nom ernvihorno Plans" |Rodm (Hema) "(ontsolun "Achuale 0esitad (orto Valb Henl Rctual Cenp Rlgordhm Sen&an Syslem (0ol systerm Cenyenaluto Mepsutedd Tempenatustr Senson temperalut Cnsen The dhsiud temperalite tho wipd refne enpeializ, ehich ha Roem Ssald ka mantaind ) Achal temperaluto will dilfotiul en Vaty becaul ectounal hcters and guing a Negativr/pedtive fadhak DistubanCas can ohango un tho oupd lord, Bosad gm tho eth eodback WWch (an he +' n eon, Which i helpfal n octrem ho inpu temp atieruy lord, ebterna Ab, thsma pouredors dughud teryp and erie TAe haale and klpuer golb tnd ON/OFE.
b)Jhr (onboroller ubee hoto 'dyramic Snce t has o allor ngulali the tenporalit in nalue, Sntce defendurg en hrieus o mulipls aclons &uch aß deliud temperalu esor, mea&uitod temporalu anol Changes along tha timo with ulyechive ta ho giren nput.
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6Poreporhonal (ontsnol= -Kp x (erio) Tntegal (entnol (i) = -k; x loso) dBliv) + rrieu istogtal vnlu. Detivahire Condshel -k dlone)[dt lrim) S. No: 0.02 fchual spad Rchuas spud+ d hucton 1200 126,35 013, 75 Deihed Prpihs ped = 50 (Civen) ehe Actual -
Desued eng Sped = L073.7S -
9s0 12395 P -Hp ehohr -(o.3 ( 123.75) -39.12S T K; * enen dtlimd + Prauios inv -
l0:5)x 123.25 (o.01) + (-1,35) -
I.868
Dky d (ethe)/da (tim) (-0.00 L C123. 35-
2s0)/0.017 2S.2S Tetal= Phop t ank+ D -37 13s + (-1.863)+ 2512S 13.943 Cuitont Hhegh pesition = new Honetlo petion 3 13S Pegrus to more= Teal hoo -
13. 43 //00 0.13743 Neuw hraL pation = lait rot t degfe o nore POih'on .?3 ?5 -0.13443 8.6 Speed (ozohHen = Tetal -13. A3
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