Noise reduction in aircraft design, Other Engineering

Noise reduction

The problem of engine noise has always been associated with aircraft. Increases in engine power have given rise to increases in noise and the indications are that the increasing power trend will continue even more rapidly in future. High noise levels are responsible for psychological and physiological damage to humans and can also cause structural damage to aircraft; this has led to limits being set on maximum noise levels of aircraft by airport authorities and it appears that these limitations will be even more severe in future. The unit that is commonly used for measuring the noise annoyance level is the perceived noise decibel (PNdB). A PNdB is a measure of noise annoyance that take into account the pitch as well as the pressure (decibel) of a sound.

1433_noice reduction.png

The figure compares the noise level bands of various jet engine types (a busy restaurant will be 75-80 PNdB).

 

Posted Date: 9/12/2012 1:53:48 AM | Location : United States







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

Write discussion on Noise reduction in aircraft design
Your posts are moderated
Related Questions

i want to take your kelp in writing the research paper, which can be published in reputed international journal.

hey, i am doing b.e in chemical engineering but by aggregate is 55%. i would like to know what courses and preparation i have to do to get a good job. pls reply as soon as possible

Fire evacuation - Railway inspections: Fire evacuation signals should be given by voice messages and these must be easily understood by the occupants. The expected populati

Explain the following observations: cells of Escherichia coli fermenting glucose grow faster when NO3 - is supplied to the culture and then grow even faster when the culture is hig

design cage type poultry house for 1000 lying birds also specify the equipments for feeding,watering,lighting and protecting birds.

draw folded plate roof structure on multi purpose hall?

Flifla sells tomatoes every day in Suk al Marqazi, the downtown fruit and vegetable market. He finds that he can order tomatoes in crates of 25 kg and he is able to stock a maximum

Water enters a smooth thin-walled tube of 1 inch diameter at 50F and leaves at 150F. Heat is supplied to the water by condensing steam on the surface of the tube at a constant temp

2. Write a MATLAB program to perform discounted reward value iteration. Show me the MATLAB code and also an output from your code for solving the problem provided in the data above