Acceptable noise levels with intelligible and unintelligible primary discourse

2006 ◽  
Vol 119 (5) ◽  
pp. 3337-3337
Author(s):  
Susan G. Hickey ◽  
Robert E. Moore
Keyword(s):  
Noise Levels ◽  
Acceptable Noise Levels

Acceptable Noise Levels and Preferred Signal-to-noise Ratios for Speech and Music

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Donguk Lee ◽  
James D. Lewis ◽  
Patti M. Johnstone ◽  
Patrick N. Plyler
Keyword(s):  
Noise Levels ◽  
Signal To Noise ◽  
Acceptable Noise Levels

Acceptable Noise Levels for New Railways

1992 ◽  
Vol 206 (2) ◽  
pp. 93-97
Author(s):  
B M Shield ◽  
J P Roberts
Keyword(s):  
Social Acceptability ◽  
Noise Levels ◽  
Railway Noise ◽  
Noise Annoyance ◽  
Acceptable Noise Levels ◽  
The Government ◽  
Channel Tunnel Rail Link ◽  
Acceptability Criteria

There is, at present, no UK legislation controlling the noise that may be emitted by railways. The widespread concern over noise likely to be radiated from the Channel Tunnel Rail Link has highlighted this deficiency and in March 1990 the Government established the Mitchell Committee to recommend guidelines for a national noise insulation standard for new railways. The results of previous studies of railway noise annoyance and the acceptability criteria that have been derived are examined with reference to recent research, and more effective criteria for social acceptability are suggested where new rail lines are concerned.

scholarly journals Statistical techniques to determine of optimal and acceptable noise levels

2021 ◽  
Vol 1032 ◽  
pp. 012006
Author(s):  
I S Balabanova ◽  
S S Kostadinova ◽  
V I Markova ◽  
S M Sadinov ◽  
G I Georgiev
Keyword(s):  
Statistical Techniques ◽  
Noise Levels ◽  
Acceptable Noise Levels

scholarly journals Aircraft Propellers, an Outdated Innovation?

2020 ◽  
Author(s):  
Pedro Alves ◽  
Miguel Silvestre ◽  
Pedro Gamboa
Keyword(s):  
Fuel Economy ◽  
Research Effort ◽  
Flight Speed ◽  
Performance Parameters ◽  
Noise Levels ◽  
Jet Engine ◽  
Performance Trends ◽  
The Future ◽  
Acceptable Noise Levels ◽  
Oil Crisis

The race for speed ruled the early Jet Age on aviation. Aircraft manufacturers chased faster and faster planes in a fight for pride and capability. In the early 1970s, dreamed that the future would be supersonic, but fuel economy and not acceptable noise levels made that era never came. After the 1973 first oil crisis, the paradigm changed. The average cruise speed on newly developed aircraft started to decrease in exchange for improvements in many other performance parameters. At the same pace, the airliner’s powerplants are evolving to look more like a ducted turboprop, and less like a pure jet engine as the pursuit for the higher bypass ratios continues. However, since the birth of jet aircraft, the propeller-driven plane lost its dominant place in the market. Associated with the idea of going back to propeller-driven airplanes, and what it represented in terms of modernity and security, it started a propeller avoidance phenomenon on the travelers and thus on the airlines. Today, even with the modest research effort since the 1980s, the advanced propellers are getting closer efficiencies to the jet-powered engines at their contemporary typical cruise speeds. This paper gives a brief overview of the performance trends in aviation since the last century. Comparison examples between aircraft designed on different paradigms are presented. The use of propellers as a reborn propulsive device is discussed. Keywords: Propeller, Aircraft, Turboprop, Flight efficiency, Flight speed

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