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ark& Aircraft Co! P s a 2 7 W E S T C E N T U R Y B O U L E V A R D . L O S A N G E L E S 45, C A L I F O R N I A . S P R I N G 6 - 1 2 1 1

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29 January 1965

Le t t e r No. ,921-5-558

National A.eronautic s and Space Administration George C. Marsha l l Space Flight Center Hunt sville, Alabama

P. t t e ntio n: Mr . J. V. Dunlap, PR-RC

Subject : Transmi t ta l of Technical P r o g A ' ss RepDrt

Reference: Contract NAS8- 11662

Gent lemen:

In accordance with the repor t s requi rements of the contract , we a t tach one (1) reproducible and seven (7) copies of the &-tb 7 w Monthly Technical P r o g r e s s Report fo r the Electro-Pneumatic Actuation System.

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(THRUI 30

Very t ru ly vours ,

PARKER ALRCRAFT CO.

>

J. E. Blaney P r o j e c t Adminis t ra tor

- JEB:ek Enc losu res

cc: Mr. J. Marks , Resident Engineer

! I

GPO PRICE $

CFSTI PRICE(S) $

Hard copy (HC) A

Microfiche (M F) * I ff 653 July 65 I

A D I V I S I O N O F P A R K E R - H A N N I F I N

https://ntrs.nasa.gov/search.jsp?R=19660001641 2018-09-15T03:06:44+00:00Z

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P R O G R E S S REPORT

NASA CONTRACT NAS8- 11662

1 .0 INTRODUCTION

1. 1 This is the seventh of the n a r r a t i v e p rogres s r e p o r t s requi red by Contract NAS8- 11’662 call ing for the design, development, fabrication, and t e s t of two e l ec t ro - pneumatic actuation s y s t e m s pe r NASA specification 5 OM3 502 6 .

GENEiiAL - 2 . 0

2 . 1

2 . 2

2 . 3

2 . 4

Component fabrication i s approximately 9070 complete. Nearly all of the par t s for the actuator and se rvo valve a r e in-house in a n unassembled condition.

The f i r s t of the servo valve second stage f lexures is through the E, D. M. phase with the s l i t s in. The meter ing edges a re now being ground and will be plated on the ends to es tabl ish the operational c learance . The second flexure i s following closely.

Small amounts of tes t f ixture adaptors and valve cove r s a r e yet to be made.

No work has been done on the gas manifolding and valving in this r epor t period. This i s a l so t r u e of the t e s t panel.

3 .0 ANALYTICAL

3 . 1 Analytical work this per iod w a s l imited to the study of t e s t data for the valve f i r s t stage.

DES I GN 4.0 -.

4 . 1 No activity needed o r per formed other than drawing maintenance.

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5.0 MANUFACTURE AND TEST

5. 1 The two f i r s t stage je t pipe and torque motor a s sembl i e s have been received, and considerable successful tes t ing has been accomplished as evidenced by the raw data shee ts ' and computations attached.

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5 .2 Test ing so far h a s been per formed on one torque motor a s sembly to insure consis tency of data. observat ions are considered of in te res t .

The following

5.2. 1 The f i r s t t e s t consis ted of dead ended operation of the first stage only, mounted on a t e s t manifold. The attached data sheet and p r e s s u r e gain curve shows excellent l inear i ty in the operat ing region and a higher p r e s s u r e gain than anticipated. The a r b i t r a r y null shows that some adjustment of null is needed to make the per formance synmetr ica l , but to insure data consis tency the first s tage sett ing a s rece ived f rom the manufacturer wi l l not be distrubed. nulled on the final valve assembly .

The torque motor will be proper ly

5 .2 .2 Note the reasonable hys t e re s i s evidenced by the c lus t e r of data points.

5 .2 .3 The manufac turer ' s t e s t data specs is included with the da ta f o r re fe rence .

5.2.4 Severa l sheets of computations and conversion f ac to r s a re included to a id in following P a r k e r ' s interpretat ion of t e s t r e su l t s .

5 .2 .5 Calibration cu rves of the f lowmeters used are included for re ference .

5 .2 .6 The jet pipe flow gain data accumulated using flow- m e t e r 3625 is included but subject to s o m e question because of later observed f lowmeter malfunctions.

5 .2 .7 F u r t h e r runs made using P a r k e r flowmeter 3626 and plotted on the curve of 1/27/65 a re of considerable in te res t .

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5.2. 7 (continued) The most important factor he re i s evidence that the assumptions made in the computer ana lys i s f o r je t pipe cha rac t e r i s t i c s have been substantiated. '

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Other fac tors of ma jo r importance and evidence of potentially good second s tage per formance as s town by t e s t s a r e :

a. F l o w f r o m one diaphragm chamber does not mater ia l ly affect the p r e s s u r e gain of the other chamber .

b. For a given sett ing (input to the torque moto r ) p r e s s u r e a s a function) of s e rvo flow i s predictable.

c . The effect of supply p r e s s u r e var ia t ion on se rvo p r e s s u r e and /o r flow is a l so predictable.

6 . 0 PROBLEM AREAS

6 . 1 There have been no ma jo r technical problems uncovered in th i s repor t period. cha rac t e r i s t i c s w i l l be explored m o r e fully and may need some final t r imming for optimization. We can opera te a sys t em using a torque motor of the demonstrated performance.

The valve nulling and p r e s s u r e recovery

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