Tdyn reference manual


Units Syntax

Every data in Tdyn must be defined with units. Most of the units can be inserted in a menu next to the entry field, but some of them should be inserted in the Tdyn Units Data window.

Every unit field in Tdyn includes several standard units definition, but user can enter additional units based on the basic units definition shown in the next table.

Unit

Dimension

Conversión factor to IS

Description

%

Undimensional

0.01

per-one-hundred

%o

Undimensional

0.001

per-one-thousand

pi

Undimensional

3.14159265

pi

e

Undimensional

2.71828183

ln-base

ppmC

Undimensional

1.00E-06

parts-per-million of phi

ppbC

Undimensional

1.00E-09

parts-per-billion of phi

U

Undimensional

1

phi units (user defined)

C

Undimensional

1

spc units (user defined)

m

Length

1

meter

A

Length

1.00E-10

angstrom

in

Length

0.0254

inch

pica

Length

0.00423333

pica=1/6[in]

ft

Length

0.3048

feet=12[in]

yd

Length

0.9144

yard=3[ft]

mi

Length

1609.344

mile=5280[ft]

leg

Length

4828.032

league=3[mi]

Nmi

Length

1852

nautic-mile

au

Length

1.50E+11

astronomic-unit

s

Time

1

second

min

Time

60

minute

hour

Time

3600

hour=60[min]

day

Time

86400

day=24[hour]

week

Time

604800

week=7[day]

month

Time

2629743.83

month=1/12[year]

year

Time

31556926

year=365.24219879[day]

Kg

Mass

1

Kilogram

g

Mass

0.001

gram

qui

Mass

100

quintal

lb

Mass

0.45359237

libra

ton

Mass

907.18474

tonne=2000[lb]

oz

Mass

0.02834952

ounce=1/16[lb]

amu

Mass

1.66E-27

atomic-mass-unit

rad

Angle

1

radian

deg

Angle

0.01745329

degre=1/180[pi.rad]

grad

Angle

0.01570796

grade=0.9[deg]

turn

Angle

6.28318531

turn=[2.pi.rad]

Gt

Temperature

1

Grade-thermical

ha

Area

10000

hectare

acre

Area

4046.85642

acre=4840[yd2]

barn

Area

1.00E-28

barn

are

Area

100

are

lt

Volume

0.001

liter

gal

Volume

0.00378541

gallon=231[in3]

brgal

Volume

0.0045461

britgallon=277.42[in3]

imp

Volume

1.20095

imperial

pt

Volume

0.00189271

pinta=0.5[gal]

qt

Volume

0.00094635

quart=0.25[gal]

cc

Volume

1.00E-06

cubic-centimeter

knot

Velocity

0.51444444

knot=[Nmi/hour]

nudo

Velocity

0.51444444

nudo=knot

mach

Velocity

331.46

sound-speed

c

Velocity

3.00E+08

light-speed

G

Acceleration

9.80665

earth-gravity

N

Force

1

Newton=[Kg.m/s2]

dn

Force

1.00E-05

dyne=[g.cm/s2]

Kp

Force

9.80665

Kilopondio=[Kg.G]

lbf

Force

4.448222

libra-fz=[lb.G]

tonf

Force

8896.44323

tonne-fz=[ton.G]

Pa

Tension

1

Pascal=[N/m2]

mmHg

Tension

133.322

mm-of-Hg

atm

Tension

101325

Atmosphere

bar

Tension

1.00E+05

bar=750.0638[mmHg]

psi

Tension

6894.75789

psi=[lbf/in2]

J

Energy

1

Joule=[N.m]

erg

Energy

1.00E-07

ergio=[dn.cm]

cal

Energy

4.1868

caloria

btu

Energy

1055.06

British-thermal-Unit

W

Potency

1

Watt=[N.m/s]

hp

Potency

745.6999

Horsepower

hz

Frequency

1

[1/s]

ppm

Density

1.00E-06

parts-per-million=[g/l]

ppb

Density

1.00E-09

parts-per-billion=[mg/l]

St

Kinematic Viscosity

1.00E-04

Stokes

P

Viscosity

1.00E-01

Poise

Examples:

W.m (watts per meter), N/m2 (newtons per square meter), m3 (cubic meter), g/cc (grams per cubic centimeter).

New units can also be created by adding standard modifiers to the basic unit. These modifiers are shown next:

 

Value

Name

a

10-18

ato

f

10-15

femto

p

10-12

pico

n

10-9

nano

u

10-6

micro

m

0.001

mili

c

0.01

centi

d

0.1

deci

D

10

Deca

H

100

Hecto

K

1000

Kilo

M

106

Mega

G

109

Giga

T

1012

Tera

E

1015

Hexa

P

1018

Peta

Examples:

Dm (Decameter), mlt (mililiter), mm2 (square milimeter), cm/s (centimeters per second).