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Questions tagged [acoustics]

59 questions
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2 answers

Simplest way to reduce low frequency noise from windows

Could you please advise the simplest method to reduce low frequency noise from windows? The problem: Somewhere outside there is a source of noise with frequency of 166 Hz. I can’t neither find nor remove it. This could be ventilation hoods on other…
Damir Tenishev
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6
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3 answers

Are there materials that are good at transmitting sound but thermally insulating?

I'm wondering if there are materials good at transmitting sound but is thermally insulating? I'm trying to figure out a good material in an engine exhaust application which will pose a barrier to the high-temp exhaust flow, but allow the exhaust…
Poompil
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5
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1 answer

Optimal size and shape for a steel target?

Problem I'm building a steel target for long-range rifle shooting. For those unfamiliar, the purpose of the steel is to produce a loud "PING" when the bullet strikes the target. It's very fun. Since I have a variety of materials to choose from, I'd…
Hundley
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4
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3 answers

How to reduce resonance from livingroom table

Odd ting, the table surface echo/resonance sound when speaking, especially lower lower frequencies. It helped putting on a cloth, but it did not completely remove resonance. Putting a rug beneath did not affect. Wonder whether box for roof lights…
Hallvard Haanes
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4
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1 answer

How much noise does a road noise barrier block?

I am from The Netherlands, where noise barriers like these are commonly built along motorways: Now I live in England, where such structures are almost non-existent. In The Netherlands, living 200 metre from a motorway, I experienced far less noise…
gerrit
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3
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Why would a "delayed loudspeaker" be so expensive in the 1970s?

Recently, I read about some major musical concert held somewhere in the USA to a record-large audience. Since there were so many people, not all could see or even hear the music from the main loudspeakers. Therefore, they put additional loudspeakers…
Silven B.
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3
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4 answers

Will a short brick wall help shield against bass or will it go around?

I have a noisy neighbor (unreasonable and hostile) generating low frequencies that are disturbing. I'm at the point where I realize I need to just build some kind of barrier, and also buy better windows and doors. So I am thinking of building a…
Torbjørn Kristoffersen
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3
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1 answer

Motor control sounds

I’m curious about the sound made by some types of high powered electric motors and related control devices. Many (but not all) large electrical motor systems make high pitched sounds that correlate to acceleration. How to describe this sound? It is…
G Roos
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3
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Piezoelectric matching/backing layer materials

To maximize the piezoelectric transducer reception/transmission power we must choose the correct backing/matching layer materials, I'm working on a project to measure a steel tank liquid level (non invasive from the bottom, sensor must be glued) and…
Tiago
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2
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1 answer

What is the mechano-acoustic effect of off-centering the black paste on tabla-drum skins?

Tabla is a musical instrument composed of two drums, the Bayan (left on picture) and the Dayan (right on picture). A unique feature of the tabla is the tuning [black] paste called the gab, applied to the center of the dayan and off-center on the…
Noil
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Does an ultrasonic horn increase displacement?

Reading the Ultrasonic Horn Wikipedia article, it states: An ultrasonic horn is a tapering metal bar commonly used for augmenting the oscillation displacement amplitude provided by an ultrasonic transducer... I can see how a smaller area would…
ericnutsch
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Is there a technical name for a sound dampening suspended cylinder in loud indoor environments?

Several years ago, I was visiting the Advanced Photon Source at Argonne National Laboratory, and I remember that in one of the working areas there were some large cylinders suspended in the air above the electronics racks by wire. Our tour guide…
cyanrarroll
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What is tonal masking?

I have checked the definition of tonal masking on Wikipedia and google but I saw the definition of sound masking and auditory masking. Auditory masking Sound masking But I want to know what exactly is tonal masking?
Nzui Manto
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2
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Will a 3-wall acoustic barrier work or will sound go around?

I have two heat pumps directly outside my house and they are noisy so I am considering the viability of using a sound barrier to block the sound. The acoustic barrier itself will definitely absorb and eliminate the sound in three directions, but the…
Wallace Park
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Are there general-purpose acoustic FFT sensors for plant diagnostics?

For the purpose of detecting a defect or failure in a machine, it is often practical to physically listen to any abnormal noises that a machine might be making, and even use a simple stopwatch to determine the frequency of these noises. This…
gsolorzanop
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