UNIVERSITATEA POLITEHNICA BUCURETI

UNITTI de MSUR / CONSTANTE TEHNICESISTEME de UNITTI

EN (USA)Pound-Foot-SecundMKS (SI)

Metru-Kilogram-SecundMKfS

Metru-Kilogram for-Secund

Uniti de baz:

Pound-mass/force - Foot - SecPound-mass (lb) - Mas etalon

Pound-force (lbf) "Greutatea" masei de 1 lb-mass:1 lbf = 1 lb ( "g" (ft/s2)Uniti de baz:

Kg-mas/Newton/Metru/SecKg-mas - Mas etalon

Newton (N)Definiie:1 N = 1 kg ( 1 m/s2Uniti de baz:

Kg-mas/-for/Metru/SecKg-mas - Mas etalon

Kg-for (kgf)"Greutatea" masei de 1 kg:1 kgf = 1 kg ( "g" (m/s2)

L1 foot (ft) = 12 inch (in) = ...0.3048 m0.3048 m

1 inch (in) sau "ol" (") = ...( 25.4 mm( 25.4 mm

Uniti tehnice:

Mile (mila terestr)

1 mile =...

Nautical Mile (mila marin)

1 nm =...1609.344 m ( 1.609 km

1852 m = 1.852 km1609.344 m ( 1.609 km

1852 m = 1.852 km

g32.17405 (ft/s2) ( 32.2 (ft/s2) = ...9.80665 m/s2 ( 9.81 m/s29.80665 m/s2 ( 9.81 m/s2

F1 pound-force (lbf)4.448222 N ( 4.45 N0.4535924 kgf ( 0.454 kgf

M1 pound-mass (lb)0.4535924 kg ( 0.454 kg0.4535924 kg ( 0.454 kg

Mas - unitate tehnic: Slug (slug)

Este masa inerial care corespunde forei de 1 lbf sub o acceleraie de

1 ft/s2 (Este o unitate foarte mare!) 1 lbf = 1 slug ( 1 ft/s2( =...

Add Fe-09 [Site RA-Aus...]Old british mass unit:

1 slug = 32.174 lb(m)

Verificare:

1 slug ( 0.454 x ...

= 14.594 kg

K: OK!

Vfoot/sec (ft/s)m/sec:

1 ft/s =...

Unitate tehnic:Knot (nod)

1 knot = 1 nm/h=...0.3048 m/s =...

1.852 km/h = 1852 m/s...Add Fe-09 [Hoblit pag 8]1 kt = 1689 fps

p

()Presiune / Tensiune mecanicpsf (lbf/ft2) - pund-per-square-foot

psi (lbf/in2) - pund-per-square-inchN/m2 (Pascal - Pa)N/mm2...

bar: 1 bar =103 mb = 105 Pa kgf/m2...kgf/mm2...at (atmosfera tehnic) kgf/cm2...

1 psi =...

etc...

ATMOSFERA STANDARD*)

T059 (F288.15 (K15 (C288.15 (K15 (C288.15 (K

p02116.22 lbf/sq.ft = 14.696 lbf/sq.in101325.0 N/m2 = 1013.25 mb10332.27 kgf/m2 = 1.033... at

(00.0023769 ( 0.0024 slugs/ft31.225 kg/m30.12492 ( 0.125 (1/8!) kgf(s2/m4

a01116.45 ft/s2 = 661.48 knots340.294 m/s = 1225.06 km/h...

(0Viscozitate cinematic1.5723 ( 10-4 sq.ft/s...1.4607 ( 10-4 m2/s...

*) Torenbeek Appendix J - pag. 572

_1287071757.unknown

_1287078711.unknown

_1287205917.unknown

_1287071416.unknown