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NAVAL SCIENCE 345 INTRO TO NAVAL ENGINEERING. WHAT IS NAVAL ENGINEERING? l “THE TRANSFORMATION OF...
Transcript of NAVAL SCIENCE 345 INTRO TO NAVAL ENGINEERING. WHAT IS NAVAL ENGINEERING? l “THE TRANSFORMATION OF...
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NAVAL SCIENCE345 INTRO TO
NAVALENGINEERING
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WHAT IS NAVAL ENGINEERING?
“THE TRANSFORMATION OF AVAILABLE ENERGY FORMS INTO FORCES FOR PROPELLING AND OPERATING WARSHIPS AT SEA”
MAKING THE SHIP GO
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WHAT’S THE POINT?
YOU are going to be a naval engineer “Technically and tactically proficient” Safety of ship and crew 2/C Cruises & Warfare schools BE THE HERO!
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Administrative Matters
Textbooks– Introduction to Naval Engineering– Principles of Naval Engineering
Syllabus– Overview– Grading policy– Responsibilities
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Individual Presentation
Independent research Expand on class topics
– Applications– Technological developments
Ability to deliver a 10 min. brief– PowerPoint recommended– Make it interesting– Preview with me
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PRINCIPLESOF
MEASUREMENT
INTRODUCTION TONAVAL
ENGINEERING
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What does it mean to measure?
IT’S A COMMON LANGUAGE
PROVIDE INDICATION OF PLANT PERFORMANCE
PROVIDE INPUT FOR ALARMS
HOURLY LOGS FOR RECONSTRUCTION(WHAT JUST HAPPENED AND WHY)
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What do we measure? LENGTH (in, ft, yd, mi, nm) AREA (in2, ft2) VOLUME (ft3, gal) MASS (lbm) FORCE or WEIGHT (lbf, tons, lt) TIME (s, min, h) VELOCITY (ft/s, mph, kts) ACCELERATION (ft/s2) PRESSURE (psia, psig, in of Hg, in of H2O) TEMPERATURE (oF, R) ENERGY (BTU, ft-lbf) TORQUE (ft-lbf, in-lbf) POWER (ft-lbf/s, ft-lbf/min, BTU/h, hp, MW)
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TEMPERATURE
A measure of a substance’s internal kinetic energy
[Simply stated] The degree of hotness or coldness of a substance, as measured on a thermometer
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Temperature Conversions Fahrenheit
– oF = (9/5 oC) + 32 Celsius or Centigrade
– oC = 5/9 (oF - 32) Rankine
– R = oF + 459.67 Kelvin
– K = oC + 273.15
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Temperature Measuring Devices
Expansion Thermometers– Liquid in glass– Bimetallic– Filled system / distant reading
Pyrometers– Thermocouple– Resistance– Radiation and optical pyrometers
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Liquid in GlassThermometer
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Bimetallic ExpansionThermometer
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DistantReading
Thermometer
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Thermocouple
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Resistance Temperature Device
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Radiation Pyrometer
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PRESSURE Force exerted on a unit area Measured in psia, psiv or psig (other
units include atm, in Hg, mm Hg) Atmospheric pressure at sea level is
14.7 psia, 0 psig, 1 atm, 29.92 in Hg, 76.0 mm Hg
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PRESSURE
WHICH EXERTS MORE PRESSURE, A 2000 POUND ELEPHANT WHICH HAS A .5 FT RADIUS FOOT, OR A 150 POUND WOMAN ROCKING ON HER HEELS WITH A .5 IN RADIUS?
ELEPHANT- 4.4 POUNDS PER SQUARE INCH
WOMAN- 95.5 POUNDS PER SQUARE INCH
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Gage and Vacuum versus Absolute Pressure
Absolute Pressure = Atmospheric Press. + Gage Press.
Vacuum = Atmospheric Press. - Absolute Press.
Don’t have absolute pressure gages
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Manometer
Pressure Measuring Devices
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Bourdon Tube
Pressure Measuring Devices
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Bourdon Tube
Pressure Measuring Devices
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Bellows Gage
Pressure Measuring Devices
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ACCURACY
KNOWING THE ACCURACY IS JUST AS IMPORTANT AS KNOWING THE APPARENT VALUE
CALIBRATION WITH A STANDARD CRUCIAL PERIODIC
MAINTENANCE…OUR GRIP ON REALITY
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Example Problems
Convert the following to oF:– 100 oC– 100 K– 100 R
Convert the following to psia– 100 psig– 10 psiv
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