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Full text of "NASA Technical Reports Server (NTRS) 19860007607: Comparison of advanced turboprop and conventional jet and propeller aircraft flyover noise annoyance: Preliminary results"

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NASA Technical Memorandum 87637 


COMPARISON OF ADVANCED TURBOPROP AND CONVENTIONAL 
JET AND PROPELLER AIRCRAFT FLYOVER NOISE ANNOYANCE: 
PRELIMINARY RESULTS 


(NASA-IM-87637) COHPABISCN OF ADVANCED 
TUBBOPBOP AND CONVENT IGNAL JET AMD PBOPELLEB 
AIBCBAFT FIIOVEB NOISE ANNOXANCE: 

PBELIHINABX BESULTS (NASA) 30 p 


HC A03/HF A0 1 


CSCL 20A G3/71 


N86-17077 ! 

Onclas 

05256 


DAVID A. McCURDY 


NOVEMBER 1985 


NASA 

National Aeronautics and 
Space Administration 

Langley Research Center 

Hampton, Virginia 23665 




SYMBOLS AND ABBREVIATIONS 


: * 



3 


ORIGINAL PAGE IS 
Op POOR QUALITY 



4 



Figure 1.- A wing-mounted, tractor, single rotating propeller configuration of an advanced turboprop 
aircraft. 





The return of propeller aircraft to long haul commercial service may be rapidly approaching In the 










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Figure 3.- Aircraft Noise Synthesis System 





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used as Input to the synthesis system. The helical tip Mach number of 0.73 resulted in a frequency 
envelope shape with an approximately linear roll-off rate of 6.2 dB per 100 Hz. Each of the 18 
simulations was presented to the test subjects at D-weighted sound pressure levels of 70, 80, and 90 dB. 
The factorial combinations of six fundamental frequencies, three tone-to-broadband noise ratios, and three 
levels resulted In 54 advanced turboprop aircraft flyover noise stimuli. 


18 ADVANCED TURBOPROP TAKEOFFS 


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EXPERIMENTAL METHOD AND DESIGN 



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4-J 

G 

z 

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4-J 


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d 

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G 

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1-1 

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cd 

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G 


15 



16 





COMPARISON OF FREOUENCY WEIGHTING PROCEDURES 



05 






G 

1^- 




G 




c 



05 



42 





O 



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o 

05 


x 



4-J 

G 



C 

tH 



CO 

TH 

P 


4H 


05 


P 



G 

4-J 



G 

4-» 

05 



• 

4 : 

P 

3 

* 


G 

G 



o 

CO 

t* 



>. 

4H 

O 

bC 

N 


£ 

TH 



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TH 



rH 

o 


Mh 

TH 

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4-J 

13 



4-» 

p 

05 

u 

05 

G 

G 


Mh 



G 

G 

13 


G 

cO 

05 

P 

4-J 

P 

05 

A 




JS 

P 

P 


G 

> 

O 

cO 

G 

G 

4-J 

G 

G 


G 


P- 

G 


p 


c 

13 

P 

G 

G 

C 

TH 

• 

42 

P- 


13 


u 

X 

05 

G 

G 

G 

P 

O 


G 

4-J 

TH 

Mh 

C 


o 

•H 

P 

cO 

G 

G 

4-> 

•H 

G 

G 


42 

O 

G 


u 

05 

05 

4-4 

G 


G 

4-J 

G 

O 

41 

CO 


4-J 




Mh 

05 

G 

G 

G 

G 

p 

TH 

4-J 

G 

CO 

CO 


13 

05 

Mh 



O 

rn 

TH 

3 

4-J 

Q 

O 

G 



c 

42 

tH 

05 


TH 

rn 

5h 

13 

O 

42 

tH 

O 

c 


G 

4H 

12 

42 

O 

4-> 

TH 

G 

G 

G 


4H 

TH 

TH 





H 

4= 

o 


> 

O 

p 

P 

G 

4-J 



05 

mh 

05 



•H 

G 


O 

p 

O 

rH 

G 

CO 


G 

o 

CO 


Mh 

13 

5-i 

G 

P 

0 

Mh 

G 

TH 

G 


P 


05 

• 

O 

05 

G 

O 

O- 

0 


P 

> 

G 


3 

42 

42 

G 


P 

be 

tH 



P 

P 

G 

G 


13 

o 

H 

C 

4-J 

a 

•H 

4-J 

G 

G 

O 

G 

13 

G 


0) 

CO 


TH 

G 


mh 

O 

42 

O 

P 

4-J 


P 


a 

05 


4-J 

05 

05 


G 

4-> 

TH ’ 

P 

G 

X5 

G 


o 


• 

CO 

0 

42 

G 

P 


4-J 

G 

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P 

Mh 


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P 

CO 

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05 

4-J 

42 

P 

Mh 

G 



G 

Mh 


Cu 

o 

3 

5h 

P 


H 

0 

O 

P 

C 

MH 

13 

TH 



OH 

rH 

CO 

G 

u 


a 


3 

O 

O 

C 

13 


4-J 


2 

> 

05 

CD 



G 

13 

tH 


G 



c 

rH 

e 


G 

4-J 

• 

G 

G 


4-J 

G 

4-J 

4-J 


g 

0) 

tH 

CJ 

05 

G 


G 

O 

Mh 

G 

CO 

CO 

G 


e 

> 

4-1 

•H 

B 

05 


O 

G 

O 

•H 

3 


42 


G 

05 

CO 

p 


P 

G 

4-J 

TH 


13 

G 

G 

4-J 


P 

rH 


4H 

G 

bt 

5h 


P 

G 

G 

G 

43 



3 


42 

05 



G 

4-J 

G 

O 

P 

G 

4-J 

G 


05 

05 

U 

£ 

CO 

05 

bC 

G 

a 

tH 

P- 

43 


4-J 


CO 

05 

cO 


TH 

4 : 

•H 

G 

B 

4-J 



c 

G 


g 

TH 

05 

05 


4-J 

Mh 

P 

O 

•rH 

Mh 

A 

TH 

G 


e 

o 


CO 

c 



G 

u 

13 

O 

4-1 


th 



g 

P 

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c 


G 

MH 


13 


G 

CO 

13 


a) 


o 

O 

TH 

G 

tH 

MH 


G 

G 

42 

G 

G 


05 

13 

MH 

G 

4-> 

0 


•H 

• 


O 

4-J 

G 

tH 


tH 

05 



G 

TH 

G 


CO 

G 

•H 


G 



o 

4-1 

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13 

TH 

4-J 

G 


c 

42 

4-> 

13 

G 

CO 


C 

cO 

0) 

G 

P 

G 

> 

G 

0 

4-J 

G 

G 

P 

4-J 



rH 

g 

G 

G 

TH 

■H 

42 

tH 


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4-> 

G 

CO 


a) 

3 

TH 


> 

> 

bC 

4-J 

4-J 

>> 

> 

O 

Mh 

G 


42 

a 

6 

CO 


05 



O 

42 

G 

c 

Mh 

4-> 


4H 

rH 

P 

3 

G 

13 

G ' 

G 

G 


13 


TH 




CO 

05 

rH 

tH 


P 

G 

p 

13 


G 

13 

rH 


Mh 

a 

4-J 

G 

P 

13 

G 

O 

p 

G 

12 

45 


G 


O 


05 

0 

4-J 

P 


P 

0 

> 

P 


Mh 

G 



05 

13 

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05 

G 

13 

O 

0 

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G 

13 

O 

tH 

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42 


4-> 

0 

13 

G 

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P 

13 

rH 


4-J 

4-J 

4-1 

<u 

0) 

CD 


G 

G 


C 

O- 

G 

3 

G 

CO 

G 

TH 


P 


05 

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th 


O 

B 

G 

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05 

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CO 

4-J 

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TH 

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4-J 

42 

G 

4-J 

G 

TH 

g 

> 

G 

tH 

CO 

0 

bC 

4-J 


CO 

CO 

G 

G 

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X3 

CO 


G 

O 


0 

G 

G 

G 



G 

4-J 

MH 

cO 


CO 

05 

c 

05 

u 

P 

P 

G 

4-J 

4-J 

TH 

CO 

tH 


rH 

C2 



42 


G 

3 

£ 

CO 

M 

Mh 


G 

a 

05 

O 

P 

42 

4-J 

4-J 

> 

13 


G 


TH 

G 

bC 

o 

> 

tH 

O 

o 


MH 

G 


G 

rH 


G 

4-J 

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f-t 

05 

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4-J 

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rH 

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be 

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05 

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3 

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05 

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4-J 

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05 

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rH 

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42 

G 

CO 

CO 


X 

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13 

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tH 


G 

p 

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p 

Mh 

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13 

G 

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u 

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o 

u 


CO 


G 

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mh 

a 

rH 

a 

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05 

CO 


MH 



P 

4-J 

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p- 

3 


05 

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Gl 


G 

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4= 


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4J 

4-J 


G 

42 

42 

cO 

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P 

4-J 

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TH 

G 

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G 

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CO 



4-J 

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TH 

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4-J 


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42 

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PD 


CO 

CO 

4-J 

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42 

G 


P 

4-> 

13 

13 

0) 


05 

G 


05 


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4-J 

G 

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P 


4-J 

05 

p 

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a 

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TH 

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O 

rH 

G 

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42 

3 

u 

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G 

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rH 

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G 

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G 


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05 

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G 

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42 

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13 

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42 

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cx 

05 

05 

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m 

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4-J 

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05 

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TONE CORRECTION PROCEDURE 





COMPARISON OF TONE CORRECTION PROCEDURES 


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100 150 200 250 300 

FUNDAMENTAL FREQUENCY, Hz 



INTERACTION OF FUNDAMENTAL FREQUENCY AND TONE-TO-BROADBAND 




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21 



FUNDAMENTAL FREQUENCY, Hz 





INTERACTION OF FUNDAMENTAL FREQUENCY AND TONE-TO-BROADBAND 



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1. Report No. 2. Government Accetsion No. 

NASA TM-87637 

3. Recipient's Catalog No. 

4. Title and Subtitle 

COMPARISON OF ADVANCED TURBOPROP AND CONVENTIONAL 
JET AND PROPELLER AIRCRAFT FLYOVER NOISE ANNOYANCE: 
PRELIMINARY RESULTS 

5. Report Date 

November 1985 

6. Performing Organization Code 

535-03-12-01 

7. Author(s) 

David A. McCurdy 

8. Performing Organization Report No. 

10. Work Unit No. 

9. Performing Organization Name and Address 

NASA Langley Research Center 
Hampton, VA 23665-5225 

11. Contract or Grant No. 

13. Type of Report and Period Covered 
Technical Memorandum 

12. Sponsoring Agency Name and Address 

National Aeronautics and Space Administration 
Washington, DC 20546 

14. Sponsoring Agency Code 

15. Supplementary Notes 


To be presented at 110th Acoustical Society America Conference, 
November 4-8, 1985, Nashville, TN. 


16. Abstract 


A laboratory experiment was conducted to compare the flyover noise 
annoyance of proposed advanced turboprop aircraft with that of conventional 
turboprop and jet aircraft. The effects of fundamental frequency and 
tone-to-broadband noise ratio on advanced turboprop annoyance were also 
examined. A computer synthesis system was used to generate 18 realistic, time 
varying simulations of propeller aircraft takeoff noise in which the harmonic 
content was systematically varied to represent the factorial combinations of 
six fundamental frequencies ranging from 67.5 Hz to 292.5 Hz and three 
tone-to-broadband noise ratios of 0, 15, and 30 dB. These advanced turboprop 
simulations along with recordings of five conventional turboprop takeoffs and 
five conventional jet takeoffs were presented at D-weighted sound pressure 
levels of 70, 80, and 90 dB to 32 subjects in an anechoic chamber. Analyses 
of the subjects' annoyance judgments compare the three categories of aircraft 
and examine the effects of the differences in harmonic content among the 
advanced turboprop noises. The annoyance prediction ability of various noise 
measurement procedures and corrections is also examined. 


17. Key Words (Suggested by Author(s) ) 

Advanced Turboprop Noise 

18. Distribution Statement 


Propfan Noise 
Propeller Noise 


Unclassified - Unlimited 

Subjective Acoustics 
Psychoacoustics 


Subject Category - 

71 

19. Security Classif. (of this report) 

20. Security Classif. (of this page) 

21. No. of Pages 

22. Price 

Unclassified 

Unclassified 


30 

A03 


N-305 


For sale by the National Technical Information Service, Springfield, Virginia 22161