Active/Passive noise control

In summary, the conversation is about a project to reduce noise in airplane AC/Heating systems. The person is using literature and research papers on noise control and is looking for information on materials that are good reflectors of sound at low frequencies. They mention a potential application for a muffler and ask for sources or ideas related to noise reduction mechanisms. One person suggests looking into "quiet steel" from Ford, which is a rubber coating with a spherical rubber filler to absorb engine noise. The original person thanks them for the information.
  • #1
leka
20
0
hi everyone,
I am currently working on a project to reduce noise in AC/Heating systems in airplanes. As reference am using some literature in Engineering Noise Control and some research papers on Active/Passive noise control. I am currently searching for some information on; if there are materials that are good reflectors of sound at low frequencies, between 500Hz and 1KHz. The current aplication that have in mind calls for a sort of a muffler(closed ends pipe, from outside). Geometry and other parameters are not defined yet.
If anyone has any sources or knows any information related to mechanisms for noise reduction or have any ideas feel free to elaborate.

cheers
 
Physics news on Phys.org
  • #2
hmmm,
guess no one is involved with this aspect of engineering...
cheers
 
  • #3
I would google 'quiet steel' which is some Ford gimic. I think it is just a rubber coating with a speherical rubber filler which is pasted onto the firewall to absorbe engine noise.

Wouldn'd be suprised if you couldn't tune it to your frequencies.
 
  • #4
thanks for the info...
 

1. What is active noise control?

Active noise control is a technology that uses electronic systems to cancel out unwanted noise in a given environment. This is achieved by creating a sound wave that is equal in amplitude but opposite in phase to the original noise, resulting in cancellation and a quieter environment.

2. How does passive noise control differ from active noise control?

Passive noise control refers to the use of physical materials or structures to block or absorb sound, rather than using electronic systems. Unlike active noise control, which can actively cancel out noise, passive noise control is more passive and relies on the properties of the materials or structures to reduce noise levels.

3. What are the main benefits of active noise control?

The main benefit of active noise control is that it can effectively reduce noise levels in a given environment without the need for physical barriers or structures. This makes it a more versatile and adaptable solution for controlling noise in various settings. Additionally, active noise control can be more precise and targeted, allowing for specific frequencies to be targeted for cancellation.

4. Are there any limitations to active noise control?

While active noise control can be highly effective, it does have some limitations. The technology works best in low-frequency or constant noise environments, and may not be as effective for high-frequency or rapidly changing noise. Additionally, active noise control systems can be expensive and require power to operate, making them less practical for some applications.

5. What are some common applications of active noise control?

Active noise control has a wide range of applications, including in aircraft, cars, and other transportation vehicles to reduce engine noise. It is also used in building design to reduce noise from outside sources, and in industrial settings to control noise from machinery. Additionally, active noise control is often used in headphones and other audio devices to cancel out external noise for a better listening experience.

Similar threads

Research on HV to UHV vacuum gauge and controller build (Amateur scale)
    • Classical Physics
Replies
1
Views
520
Electronic Noise General Questions - Laboratory Setting
    • Electromagnetism
Replies
3
Views
2K
Active/Passive noise control
    • General Engineering
Replies
2
Views
7K
Active Noise Control for Waterjet | Hi Everyone Forum
    • General Engineering
Replies
1
Views
4K
Complete Noise Analysis: to find the minimum detectable signal
    • Electrical Engineering
Replies
9
Views
2K
Acoustic Parameters for Passive Noise Control
    • Engineering and Comp Sci Homework Help
Replies
1
Views
1K
Ramjet artillery shell of a big size
    • Aerospace Engineering
2
Replies
35
Views
3K
PID controller for current control by adjusting the PWM
    • General Engineering
Replies
13
Views
5K
Exit temperature of cooling pond
    • Materials and Chemical Engineering
Replies
8
Views
3K
How Can I Improve Signal Transmission and Reduce Noise in High Magnetic Fields?
    • Electrical Engineering
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top