Page 16 - Thomson, William Tyrrell-Theory of Vibration with Applications-Taylor _ Francis (2010)

The SI System of Units

Example 3
Modulus of Elasticity, E:

in.
lb
(6894.7)
in.
E of steel N/m^ = (29 X 10^ Ib/in.^)(6894.7) = 200 X 10^ N/m^

Example 4
Spring Stiffness, K:
[N/m] - [Ib/in.] X (175.13)
Mass, M:
[kg] = [lb • sVin.] X (175.13)

CONVERSION FACTORS* U.S.-BRITISH UNITS TO SI UNITS
To Convert From To Multiply By

foot/second^ (ft/s^) meter/second^ (m/s^) 3.048 X 10“ ’*
inch/second^ (in./s^) meter/second^ (m/s^) 2.54 X 10“^*
Area:
foot^ (ft^) meter ^ (m^) 9.2903 X 10
inch^ Gn.^) meter ^ (m^) 6.4516 X lO“**
yard^ (yd^) meter ^ (m^) 8.3613 X 10“ ’
Density:
pound mass/inch^ (Ibm/in.^) kilogram/meter^ (kg/m^) 2.7680 X 10^
pound mass/foot^ (Ibm/ft^) kilogram/meter^ (kg/m^) 1.6018 X 10
Energy, Work:
British thermal unit (Btu) joule (J) 1.0551 X 10^
foot-pound force (ft • Ibf) joule (J) 1.3558
kilowatt-hour (kw • h) joule (J) 3.60 X 10^*
Force:
kip (1000 Ibf) newton (N) 4.4482 X 10^
pound force (Ibf) newton (N) 4.4482
ounce force newton (N) 2.7801 X 10“ ’
Length:
foot (ft) meter (m) 3.048 X 10“ ’*
inch (in.) meter (m) 2.54 X 10 “2*
mile (mi) (U.S. statute) meter (m) 1.6093 X 10^
mile (mi) (international nautical) meter (m) 1.852 X 10^*
yard (yd) meter (m) 9.144 X 10“ ’*