Noise suppression in aircraft design, Other Engineering

Noise Suppression in Aircraft Design:

It has been seen that the first step towards noise suppression is at the design stage of the rotating and static parts of the engine. Thereafter, further reduction in the noise level emanating from a particular engine may be achieved by the incorporation of special materials and innovations during its construction. These additional methods of noise suppression are briefly described as:

a) Absorption by acoustic linings.
b) Turbine, compressor and fan noise alleviated by control of nozzle area and shape.
c) Reduction of exhaust jet noise by mixing.
d) Fan duct cowling design

Acoustic Linings

One method of suppressing the noise from the fan stage of a high by-pass ratio engine is to incorporate a noise absorbent liner around the inside wall of the by-pass duct. The lining comprises a porous face-sheet, which acts as a resistor to the motion of the sound waves and is placed in a position such that it senses the maximum particle displacement in the progression of the wave. The depth of the cavity between absorber and solid backing is the tuning device, which suppresses the appropriate part of the noise spectrum. The figure shows two types of noise absorbent line; the figure shows the location of a liner to suppress fan noise from a high by-pass ratio engine and also the use of a liner to suppress the noise from the engine core. The disadvantage of using liners for reducing noise are the addition of weight and the increase in specific fuel consumption caused by increasing the friction of the duct walls.

735_Noise Suppression.png

Posted Date: 9/12/2012 2:03:33 AM | Location : United States







Related Discussions:- Noise suppression in aircraft design, Assignment Help, Ask Question on Noise suppression in aircraft design, Get Answer, Expert's Help, Noise suppression in aircraft design Discussions

Write discussion on Noise suppression in aircraft design
Your posts are moderated
Related Questions
Description of the Diet Problem The goal of the diet problem is to find an ”optimal” combination of foods that will satisfy all the daily nutritional requirements of an individual.

With the help of circuit diagram and the waveforms,explain the working of a negative clipper with positive biasing voltage.also explain the Same concept in series clipper circuit

Enumerate possible impact of having inadequate system design in the lead time and engineering cost?

Static stability derivatives Static stability requires that a restoring action to any motions caused by forces and moments is auto-matically produced along and about the same a

please explain a bout blog diagram of flame photometer

design a 32:1 multiplexer using 16:1 multiplexer

hi there, i need to know if its possible to create a circuit of automatic interior car lights control

how to find points on Ts diagram?

Zero-Coupon Bond is a type of bond gives no periodic interest payments, instead is sold at a steep discount from its face value. Due to these bonds these do not pay interest until

detail information about production planning in tool engineering