Research Division Goleta, California

RECOMP II USER'S PROGF.A.lvl NO.

1104

PROGRAH

TITLE:

STANDARD ATMOSPHERE PROGRAN CLASSIFICATION: General

AUTHOR:

PURPOSE:

DATE:

W. Wellman

Servomechanisms, Inc.

Research Division Goleta, California

Calculates pressure from altitude, or

vice-versa, assuming

any

model temperature- altitude profile

^~nd

the perfect gas lawe April 1961

Published

by

'RECOMP User's Library

at

AUTONETICS INDUSTRIAL PRODUCTS

A

DIVISION OF

NORTH AMERICAN AVIATION, INC.

3400 E. 70th Street, Long Beach 5, Calif.

DISCLAIMER

Although it is assumed that all tho precautions have been taken to cho::k out this program thoroughly, no responsibility Is taken by the originator of this program for any crron~ous

results, misconceptIons, or mi!lrepresentclticns thdt may ar.:pear in this program. Furthermore, no rc!.ponsibility is t:1~on by Autonetic'S Industrlol ProducfI for the correct rcoroduc:t,ons of this program. No worrantY

I

^{express or implied,} is extended by the "18 or appUcotion 0

too

^program.

PURPOSE:

METHOD:

1 } 7- H.

STANDARD ATMOSPHERE

Calculates pre s sur e from altitude, or vice -ver sa, as sum ing any model temperature-altitude profile and the perfect ga::> law.

Several variations of the fundamental differential equation,

-dP· z:

p are programmed.

-0 dH T m

A. To calculate altitude from pressure, either:

( 1)

T

Tmb

-OIL

m

m 1 : - -

L m

( ~)

, L

P

0 and (2) T _m

- T

_mb

H

=

H

+

b L

m

or (3) T

ln ( :b)

H . 1: mb Q

+

Hb

and (4) T _m

=

^T _mb

are used.

B.

To calculate pressure from altitude,

(

-(H - H ) Q (1) p .. P b exponential T b

(2) T = T mb

m mb

and

or (3) OIL

m

and (4) T:c Tmb

+

(H - Hb~

· L

_m

are used.

m

L =0

m

either:

,L =0 )

m

.L B 0

" m

C. Base layer constants, are obtained from a table stored at the end of this routine.

Page 2

USE:

A. Call ing Sequence:

B.

I. To calculate pressure from altitude:

TRA (La)

·Enter with altitude in the A 8r R registers Exit with pres~ure in the A &r R registers 2. • To calculate al titudc from pre s sure:

TRA (Lo

+

02)

En.ter with pressure in the A 8r R registers Exit with altitude in the A & R registers

3. In both cases (1, 2 above), the following table is available in the locations shown:

(La

+

100), 7760 H (La

+

10l), 7762 ^p (Lo

+

104), 7764 T

(La

+

106), 7766

T/288.16

Time: approximately 1 second, either way

C. Storage: 250 (octal) words, including all data for the 1959 ARDC Model Atmosphere. (Data occupy locations (Lo

t

120) through (La

+

l47) ).

Both L and V loops are used.

This routine is relocatable.

D. Data:

1. For each atmospheric layer, 4 data are required:

Hb ,height of base of layer Pb • pressure at base of layer

Tmb, absolute temperature at base of layer

~m ' temperature gradient throughout layer Sea level data goes in Lo

+

120, 2, 4, 6. The next

higher layer's data goes in the next eight words, and so on, The last valid data should be followed by

H >

. larger than largest H to be encountered, and P u &te:ro.

UNITERMS:

Page 3

2. Constant:

Lo

+

30:- Q ^{:I: -} O~ 034 164 794 278 °K/m^t

3. Units:

Any consistent set of units may be employed; the following are the present units:

P millimeters of mercury» mmHg H geopotent ial meter s, m t

T degrees Kelvin. oK m

Q. L : Unit T per unit H, ·oK/m t

m

40· Routines required (both are contained in Program Preparation Packa~e #2) :

(a) Exponential (AN044) in 1050 (called from Lo

+

43 and Lo

+

73) (b) l..-ogarithmic (Af\037) in 0770 (called from Lo

+

40 and Lo

+

70)

Altitude. sta·tic pressure, atmosphere, model atmosphere.

standar9 a.tmosphere, pressure, temperature, lapse rate, geopotent ial .

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