1. NAVAL SCIENCE 345 INTRO TO NAVAL ENGINEERING

2. WHAT IS NAVAL ENGINEERING? l “THE TRANSFORMATION OF AVAILABLE ENERGY FORMS INTO FORCES FOR PROPELLING AND OPERATING WARSHIPS AT SEA” l MAKING THE SHIP GO

3. WHAT’S THE POINT? l YOU are going to be a naval engineer l “Technically and tactically proficient” l Safety of ship and crew l 2/C Cruises & Warfare schools l BE THE HERO!

4. Administrative Matters l Textbooks –Introduction to Naval Engineering –Principles of Naval Engineering l Syllabus –Overview –Grading policy –Responsibilities

5. Individual Presentation l Independent research l Expand on class topics –Applications –Technological developments l Ability to deliver a 10 min. brief –PowerPoint recommended –Make it interesting –Preview with me

6. PRINCIPLES OF MEASUREMENT INTRODUCTION TO NAVAL ENGINEERING

7. What does it mean to measure? l IT’S A COMMON LANGUAGE l PROVIDE INDICATION OF PLANT PERFORMANCE l PROVIDE INPUT FOR ALARMS l HOURLY LOGS FOR RECONSTRUCTION(WHAT JUST HAPPENED AND WHY)

8. What do we measure? l LENGTH (in, ft, yd, mi, nm) l AREA (in 2, ft 2 ) l VOLUME (ft 3, gal) l MASS (lbm) l FORCE or WEIGHT (lbf, tons, lt) l TIME (s, min, h) l VELOCITY (ft/s, mph, kts) l ACCELERATION (ft/s 2 ) l PRESSURE (psia, psig, in of Hg, in of H 2 O) l TEMPERATURE ( o F, R) l ENERGY (BTU, ft-lbf) l TORQUE (ft-lbf, in-lbf) l POWER (ft-lbf/s, ft-lbf/min, BTU/h, hp, MW)

9. TEMPERATURE l A measure of a substance’s internal kinetic energy l [Simply stated] The degree of hotness or coldness of a substance, as measured on a thermometer

10. Temperature Conversions l Fahrenheit – o F = (9/5 o C) + 32 l Celsius or Centigrade – o C = 5/9 ( o F - 32) l Rankine –R = o F + 459.67 l Kelvin –K = o C + 273.15

11. Temperature Measuring Devices l Expansion Thermometers –Liquid in glass –Bimetallic –Filled system / distant reading l Pyrometers –Thermocouple –Resistance –Radiation and optical pyrometers

12. Liquid in Glass Thermometer

13. Bimetallic Expansion Thermometer

14. Distant Reading Thermometer

15. Thermocouple

16. Resistance Temperature Device

17. Radiation Pyrometer

18. PRESSURE l Force exerted on a unit area l Measured in psia, psiv or psig (other units include atm, in Hg, mm Hg) l Atmospheric pressure at sea level is 14.7 psia, 0 psig, 1 atm, 29.92 in Hg, 76.0 mm Hg

19. PRESSURE l 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? l ELEPHANT- 4.4 POUNDS PER SQUARE INCH WOMAN- 95.5 POUNDS PER SQUARE INCH

20. Gage and Vacuum versus Absolute Pressure l Absolute Pressure = Atmospheric Press. + Gage Press. l Vacuum = Atmospheric Press. - Absolute Press. Don’t have absolute pressure gages

21. Manometer Pressure Measuring Devices

22. Bourdon Tube Pressure Measuring Devices

23. Bourdon Tube Pressure Measuring Devices

24. Bellows Gage Pressure Measuring Devices

25. ACCURACY l KNOWING THE ACCURACY IS JUST AS IMPORTANT AS KNOWING THE APPARENT VALUE l CALIBRATION WITH A STANDARD l CRUCIAL PERIODIC MAINTENANCE…OUR GRIP ON REALITY

26. Example Problems l Convert the following to o F: –100 o C –100 K –100 R l Convert the following to psia –100 psig –10 psiv