Acoustic linings in aircraft engine, Other Engineering

Acoustic linings in Aircraft engine:

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. Figure 19.7. shows two types of noise absorbent liner. Figure 19.8. 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.

617_Acoustic linings.png

1492_Acoustic linings1.png

Posted Date: 9/12/2012 7:45:00 AM | Location : United States







Related Discussions:- Acoustic linings in aircraft engine, Assignment Help, Ask Question on Acoustic linings in aircraft engine, Get Answer, Expert's Help, Acoustic linings in aircraft engine Discussions

Write discussion on Acoustic linings in aircraft engine
Your posts are moderated
Related Questions
Briefly describe a simple method of estimating summer outside air conditions for the design calculations of an air conditioning scheme. If a more accurate assessment of heat gains

how can i link quality assurance and accreditation with a valid applicaion of my own work?

What is smoked rubber

A 10m diameter circular tunnel is to be excavated in a jointed ground.  The joint sets spaced at 6m are dipping towards the West at 50°.  A horizontal circular tunnel is to be cons

TRANSPORT 2 CHEMICAL PROCESS CONTROL CHEMICAL REACTIONS ENGINEERING

THE IDEAL OPERATIONAL AMPLIFIER Although the characteristics of an ideal operational amplifier are unattainable, modern integrated circuit types can provide an extremely close

name and elaborate the decision problems in urban and regional planning?

The unity gain follower: The somewhat lengthy term operational amplifier will now be dropped and it will be referred to, as most people do, simply as the op amp.  The simplest

can u help me with a reliabilty assignment

explain the fibre optic communication system with block diagram