Français
5. Propeller acoustics
For more information, see
5.1 Noise. Notions
One of the disadvantages airlines have identified with propeller-driven regional jets is that they are noisier than jet-powered aircraft. Improving acoustic comfort is therefore a prime objective if we are to take full advantage of the benefits of this type of propulsion in this speed range (propulsive efficiency, operating cost, etc.). Noise is the sensory manifestation of a temporal variation in fluid pressure at the level of the human ear. The sensitivity range of the human ear extends from 20 Hz to 20 kHz, and varies according to frequency. The unit of evaluation of this pressure is the decibel (dB) in comparison with the reference pressure,...
The Ultimate Scientific and Technical Reference
This article is included in
Hydraulic, aerodynamic and thermal machines
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Propeller acoustics
Mechanical design
Bibliography
References
Certification
The regulations governing propeller certification are mainly laid down by the American (FAR PART 35) and European (JAR-P) authorities.
Research center
Office National d'Etudes et de Recherche Aéronautique (ONERA)
Main helicarists
Ratier-Figeac, France
Hamilton Standard, United States
Dowty Rotol, United Kingdom
Hartzell Propeller Inc, United States
The Ultimate Scientific and Technical Reference
