What Causes the Sound We Hear During Bus Travels at Night?

Especially during long night journeys, when we lean our heads against the bus window, feeling slightly tired. we hear a humming and this sound strangely gives us peace. We fall asleep while the sound is ringing in our ears.

There are even 1-hour videos on YouTube with only this sound. your voice what sound is it We don’t know if you’ve ever questioned it before, but if it aroused curiosity in your mind when you read the title, let’s take you towards the details of the content.

Let us remind you for those who do not understand the sound:

https://www.youtube.com/watch?v=hroOTxom_w8

The operating principles and parts of private cars and large vehicles such as buses and trucks are generally different from each other.

If we give an example of the difference between small cars and buses; trucks are generally used to control heavy loads. special braking systems While small cars use standard braking systems.

Here’s what we don’t hear in our private vehicles. The reason for the sound we only hear on bus trips is In fact, it stems from exactly such a difference.

When we understand the difference between the brake systems in buses and small vehicles, we will also learn the source of the hum.

retarder

As we just mentioned, cars have lower weight than buses. disc or drum A relatively easier braking system is used. Vehicles such as trucks or buses also have different braking systems as “primary” and “secondary”.

The system we call “primary” is actually a combination of pads and brake discs, just like in our cars. by the principle of friction it works. The system we call “secondary” includes exhaust brake, engine brake and hydraulic retarder, etc. covering systems. These secondary braking systems are called retarders.

So what is this retarder and what does it do?

The sound we hear on buses, which creates an “ASMR” effect and puts us to sleep, means that the retarder is working. Retarder that provides deceleration, It kind of supports the braking ability. In fact, the origin of the word means “slowing down”.

We can also explain it this way; It reduces wear and extra costs by ensuring less use of brake pads, from steep slopes They offer safety by preventing the risk of brake release when descending, and since the intensity can be adjusted by the driver, they can also adjust the torque control at different levels.

Now that you know the source of the sound, you can fall into a more peaceful sleep by listening to the humming sound…

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