Ford/Lincoln CompanyECEN 4610

Preliminary Design ReviewJanuary 28, 2003

Oliver Mansour, Dan Spendley, Davy Odom, Lincoln Ritchie, Kelli

Settell

PurposeWork in collaboration with a team of mechanical engineers on an existing project to increase signal clarity and redesign system components to improve performance and reduce cost.

Performance Feel Project

Neeraj GuptaDonald StricklandSanjeev Sharma

Taylor RyanAaron Aikin

Professor Jack Zable

University of Colorado at Boulder

Senior Design Project

Overall Project ObjectivesDesign and develop a system to obtain data relating to performance feel.Develop a mathematical model to relate the physical data measurements to the customer’s perception of performance feel.

EE Project Objectives• Eliminate noise • Condense the overall system by

replacing existing components • Add calibration process• Possible RF interface for data

transmission

Lab Test ResultsAccelerometer X-direction

-6

-4

-2

0

2

4

6

15 20 25 30 35 40

Time (s)

Acc

eler

atio

n (

g)

Accelerometer Y-direction

-8

-6

-4

-2

0

2

4

6

8

15 20 25 30 35 40

Time (s)

Acc

eler

atio

n (

g)

Accelerometer Z-direction

-8

-6

-4

-2

0

2

4

6

15 20 25 30 35 40

Time (s)

Acc

eler

atio

n (

g)

String Potentiometer

012345678

15 20 25 30 35 40

Time (s)

Dis

pla

cem

ent

(in

)

Db Meter

-1

0

1

2

3

4

5

6

0 10 20 30 40 50

Time (s)

(no

t ye

t ca

lib

rate

d)

Physical Test ResultsAccelerometer ( X -dir )

-15

-10

-5

0

5

10

15

0 5 10 15 20 25

Time

Acc

eler

atio

n (g

)

Accelerometer ( Y-dir )

-1.5

-1

-0.5

0

0.5

1

1.5

2

0 5 10 15 20 25

TimeA

ccel

erat

ion

(g)

Accelerometer ( Z -dir )

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

0 5 10 15 20 25

Time

Acc

eler

atio

n (g

)

String Potentiometer

-8

-6

-4

-2

0

2

4

6

8

0 5 10 15 20 25

Time

Po

siti

on

(in

)

dB Meter

-10

-5

0

5

10

15

20

0 5 10 15 20 25

Time

(no

t ye

t ca

lib

rate

d)

12 V DC SUPPLY FROM CAR

DC INVERTER300W, 110V AC

SIG. COND. -1130 W, 110 V AC

SIG. COND. -2130 W, 110 V AC

ACCELEROMETERS (4)

LAPTOP WITH DAQ CARD.

dB SENSOR

STRING POT. FOR PEDAL DISP.

9 V DC BATTERYLOAD CELL FOR

PEDAL FORCE

TACHOMETER

CONTROLLER BOX

Schematic for System

Constant Voltage/Current Source

68H712Micro-

processor

Outline of Approach• Deadlines from other group make

some tasks have priority over others

• Solution- Divide project into two parts

First Task: Clean Up Existing Data Signals

• Test current system for noise source(s)

• Reduce noise in system:– Using necessary wiring and shielding

techniques– Implementing noise filters

Second Task: Design and Develop New Component System:Signal/Power Conditioner

• Design and build constant current and voltage source to run sensor devices– Load cell, constant current– Accelerometer, constant voltage

• Localized signal conditioning– Implement hardware filtering– Signal amplification

Second Task: Design and Develop New Component System:

Controller

• Design and build controller box– Use “micro-processor” (Motorola 68H712?) – Provide brains for calibration– Eliminate need for DAQ card

• Localized data storage• Communication through serial port/RF

link

Design AlternativesInvestigate different micro-processor optionsUse varying amounts of hardware and software filtering

12 V DC SUPPLY FROM CAR

DC INVERTER300W, 110V AC

SIG. COND. -1130 W, 110 V AC

SIG. COND. -2130 W, 110 V AC

ACCELEROMETERS (4)

LAPTOP WITH DAQ CARD.

dB SENSOR

STRING POT. FOR PEDAL DISP.

9 V DC BATTERYLOAD CELL FOR

PEDAL FORCE

TACHOMETER

CONTROLLER BOX

Schematic for System

Constant Voltage/Current Source

68H712Micro-

processor

Constant Current and Voltage Source

Voltage and CurrentSource

12V Power Supply

Voltage to Accelerometers Signals from Accelerometers

Current to Load Cell Signal From Load Cell

Signals to Controller Box

12 V DC SUPPLY FROM CAR

DC INVERTER300W, 110V AC

SIG. COND. -1130 W, 110 V AC

SIG. COND. -2130 W, 110 V AC

ACCELEROMETERS (4)

LAPTOP WITH DAQ CARD.

dB SENSOR

STRING POT. FOR PEDAL DISP.

9 V DC BATTERYLOAD CELL FOR

PEDAL FORCE

TACHOMETER

CONTROLLER BOX

Schematic for System

Constant Voltage/Current Source

68H712Micro-

processor

Controller Box

Controller Box

Signals from Sensors / Conditioner

Calibration Test Signals

Calibration Test Data

Serial Output for Data Transmission(RF Link?)

Design Risks

Unfamiliarity with component abilities and limitationsLimited experience in troubleshooting existing systems

Division of Labor• Clean existing signals

– Entire team, to familiarize with the current ME system

– Due to deadline requirements by ME team

• Processor– Davy, Oliver, Dan

• Signal Conditioner– Kelli, Lincoln, Dan

 

Project Schedule

Project CostItem Vendor Model # Cost

3-axis Accelerometer PCB Peizotronics UT356A15 250.001-axis Accelerometer PCB Peizotronics U352B10 600.00Tachometer Industrial Process Measurements Inc. ACT-1B/12 450.00String Potentiometer Space Age Control 173 240.00dB Meter Extech Instruments 407706 35.00Load Cell Futek L16010 375.00Signal Conditioner PCB Peizotronics 48A22 325.00Data Acquisition Card (DAQ) National Instruments DAQCard-AI-16E-4 450.00Power Inverter General Electric AV93641 60.00Laptop Hewlett Packard Omnibook 900 NAConnector Box National Instruments SCB-68 295.00Microprocessor Motorola 68H712 15.00Miscellaneous ? ? < 50.00Total Amount Saved: >$1065.00