The STC also increases with increasing glass thickness. Figure 2. Sound transmission class STC versus interpane spacing for double glazing 6. If the separation between the two layers of glass is small, the STC rating is only slightly higher or may actually be lower than that for a single layer of the same glass.
This occurs because the air in the space between the two layers of glass acts like a spring transferring vibrational energy from one layer to the other. This causes an abrupt decrease in the TL that is commonly called the mass-air-mass resonance.
The frequency at which this resonance occurs is given by the expression: where t 1 and t 2 are thickness of the two glass layers and d is their separation, all in mm. The resonance falls within the frequency range of to Hz for typical factory-sealed double glazing, as illustrated in Figure 3. Much of the sound energy from aircraft or road traffic falls within this frequency range.
By increasing the airspace and using heavier glass, the resonance frequency can be lowered to improve the insulation against such noise sources. Figure 3. The effect of a small airspace on TL of double glazing.
Below the mass-air-mass resonance frequency, the double glazing has the same TL as single glass with the same total glass thickness. Far above the resonance frequency, the TL is higher than that for either layer by itself, and increases like the STC approximately 3 dB for each doubling of the airspace. Despite the widespread belief that adding another layer of glass must be beneficial, triple glazing provides essentially the same noise reduction as double glazing, unless the interlayer separation is very large.
Figure 4 compares TL data for a double-glazed window with that for a triple-glazed window of similar total thickness. At higher frequencies, the TL curves are almost identical.
The STC ratings for the two windows are the same. Figure 4. TL of double and triple glazed windows. The small difference between the TL of double and triple glazing is not restricted to factory-sealed glazing mounted in a single sash where total air space is normally 15 mm or less.
Unless both airspaces are much larger than this, the STC of triple windows is very similar to that of double windows. For a double window with a large airspace, replacing one of the layers of glass with factory-sealed double glazing gives only a small increase in the STC.
In cases where substantial noise reduction is required, double glazing is the most sensible choice. It originated as an industrial grade product which could be used to enclose a noisy machine in a manufacturing plant or be used as a movable sound wall.
It is usually fairly challenging to get it into a residence not only because of the look of the product but also because of the weight. We pound grommets through the top of the panels to use as a mounting point. Because these curtains weigh about 1. Usually when they are installed, they are left in place all of the time. I am an Electronic enginner and I am trying to find some generic solution for the noise problem in my house What about using active methods to reduce noise ,such as receving the signal from an array of microphones posted in front and repeating the same waveform deviated by degrees after amplification through loud speakers posted at the rear?
If you find a way to do this, please share the technology with us. Try using sound proof windows instead. I was suffering from same from later i came to know that sound proof windows are made of 2 glass with vacuum inside it which helped me a lot.
As far as I understand acoustic physics, this is not possible ie. Imaginative concept, but not realistic. Then put the speaker either in a cabinet, or in the centre of a piece of wood about 4 feet square.
This is because the same sound waves come from the back of the cone, but degrees out of phase…so cancelling the sound! Many of these window treatments also serve as quality blackout curtains , which have a foam backing that helps block out light. Curtains that absorb sound and block light are great options for bedrooms and other spaces designed for sleep and relaxation.
They are especially popular with folks who work night-shift hours and need to rest during the day. Cellular shades , also known as honeycomb shades, consist of rows of cells or hexagonal tubes of fabric stacked on top of each other.
These shades serve several purposes: They block out light, prevent indoor heat gain in the summer and retain heat in winter, and absorb sound that vibrates into a room to reduce the echo. While single-cell shades have a single layer of cells and absorb limited sound, double-cell shades such as those by First Rate Blinds have two layers of cells and thus absorb more sound. As for that drum kit your in-laws bought for the kids, however. While reading through information on window soundproofing, you may have thought of a few additional questions about the process.
Consider these last tidbits of info, below, before you make your final decisions about how to block the noise. The most affordable way to soundproof your windows is to caulk them with acoustic caulk. Remove any existing silicone caulk and recaulk with a product that is specifically designed to block window noise. Window treatments are another economical way to soundproof your windows. But the philosophy behind each of these methods is always the same: add more mass to the noise-barrier.
The window is a thin barrier, typically much thinner than walls. Before you go crazy and place all kinds of soundproofing material on your wall, think about the free air-flowing gaps that are present. These can be really tiny gaps a few millimeters , but sealing them will still make a big difference. You can seal the window gaps by using affordable weatherstripping insulation tape.
Some of these tapes are more effective than others. Check it out by clicking here link to Amazon. The way to install this tape is by covering the window frame with it. One layer or two layers, depending on how big the gaps are. When you close the window after applying the tape, there should be a perfect seal. There is also the bottom gap, found on the lower part of the frame. While the same tape can be used to cover gap, usually this gap is a bit larger than the others.
So you may want to use something a bit stronger. These two things should be enough to seal all the gaps in your window perfectly.
Now we can focus on placing additional mass on the window. You may have some cracks between the window frame and the wall. This is where acoustic sealant comes in handy.
I recently wrote a short article on this product and how to use it, so definitely check it out to learn more about sealing these cracks. Noise-blocking curtains are much thicker and heavier than regular curtains. They are hanged in the same way from a curtain rod, but they provide much better sound insulation and thermal insulation.
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