Acoustic linings in aircraft engine, Other Engineering

Assignment Help:

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


Related Discussions:- Acoustic linings in aircraft engine

Interlaminar fracture tests on composite materials , Generally, there are t...

Generally, there are three modes to describe different crack surface displacement in a cracked body. Mode I is opening or tensile mode where the crack surfaces move directly ap

Human values, what is the basics suggetion for the education values

what is the basics suggetion for the education values

Duct with flow control-aircraft maintenance, Duct With Flow Control-Aircraf...

Duct With Flow Control-Aircraft maintenance: BERNOULLI'S THEOREM This theorem can be related to the relationship between pressure and velocity existing in the air flowing

Electrical ice protection systems, Electrical ice protection systems: E...

Electrical ice protection systems: Electrical ice protection systems are used on most turbo-props.  Resistance wire heater elements are embedded in rubber and cemented from the

Barometric lag, My question is that i am working in a petrochemical plant w...

My question is that i am working in a petrochemical plant where in final stage disc ring reactor the barometric lag is chocked completely the system is under vacuum if i introduce

Bay cooling in aircraft, Bay cooling in Aircraft: There are two methods...

Bay cooling in Aircraft: There are two methods of bay cooling, they are: • Ram air cooling • Fan air cooling RAM AIR COOLING For ram air cooling, the aircraft has to

Draw a block diagram of the control loop, A speed control system has an amp...

A speed control system has an amplifier-motor-control element capable of maintaining a speed of 4000 rpm at the output shaft with no external load and an input of 8 mV to the ampli

Technical drawing, career aspiration as a determinant to senior secondary ...

career aspiration as a determinant to senior secondary school students performance in Technical drawing.

Corrosion cracking, offer an explanation for why cracking might have occurr...

offer an explanation for why cracking might have occurred. Give at least three suggestion on how to prevent this type of corrosion. You may supple with appropriate figures

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd