Information Required on Tyre Noise

Hmm, interesting one, I've noticed that some brands of tyre are noisier then others, Michelin comes to mind, and not necessarily related to tyre performance. I've often wondered if the noise is solely down to the tread pattern, but thought that's to simple. I look forward to any other responses.

hi thanx for the info will u plz send me some specific info about the topic . the topic is very rear so im not able to get sufficient info

I think it's the tread pattern, truck tires make more noise then car tires. but I have no proof. just a gut feeling.

My understanding is that it comes down to primarily 2 factors:

1. Tread Block Size - the bigger single elements are, the more noise generated

2. Spacing between tread blocks - the wider the noisier

While compounding and belting contribute, have been toold these are the big 2.

Dan Law

hi thanx for the info will u plz send me some specific info about the topic . the topic is very rear so im not able to get sufficient info

Everyone's on the right track.

There are a few major reasons for tire road noise:

1. Compound tire is made from (soft or hard). If you have ever run snow tires during the summer, you will notice that they are much noisier during the summer. This is because most winter tires are made with a softer compound than all-season radials. Softer tires=more noise.

2. Tread pattern. If you have a bigger tread block and deeper tread pattern as with winter tires you will have more road noise. i.e. more rubber hitting the pavement means more noise from that rubber.

3. Road composition. i.e. material road is made from. Ever noticed that the same tire seems noisier on concrete/cement roads than pavement? That's because concrete is more dense/harder than pavement and pavement is made with compounds that absorb more noise.

4. Ambient Temperature. The colder your tire gets the harder the tread becomes thus making more noise.

5. Radial (steel belted) vs. Bias-ply tires (usually fibreglass-belted). As radial tires wear the steel belts become more exposed thus creating more noise.

I am sure I probably missed a few more, but these are the major reasons for tire noise.

Cheers

Your point 1 says softer tyres = more noise,

point 4 says harder = more noise.

I know you are making a distinction between temperature and compound, but for practical purposes I see no difference.

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Not only that, train and rail create a lot of noise. None of them soft or have the shape of tyres. Vibration and motion are related and also the material that comes to contact and its natural frequency. Trapped air underweight will also will come with thud. You can see how particle bump out from pressure of the tyre if they find a way out. All that is noisy. Some visible some invisible.

I think it was a very good question I have ever heard after aircraft noise. I want to tell you that Boeing keeps minimum noise to make you feel you are paying for the travel and if by design the aircraft is noiseless, they will put something that will create the noise level. This part I came to knew from a girl who was working at Boeing as Physics journalist some 25 years ago. I am not sure if norms have changed much. If you hear all that noise which does not sound like from the aircraft body shaking then ask for the vibrator they might have placed somewhere on the aircraft and it will create noise even after safe landing of the aircraft.

Some leather shoe create a lot of noise and hence, material of the tyre should have some good reason other than the shape outside.

I do not have a definitive answer for you, but like the others have circumstantial evidence. Noise from tyres involves several variables starting with the compound of the tire. Tread design plays a part as does the rotational speed of the tyre. Another component touched upon is the overall weight of the vehicle vs tire size. The type of road surface can also make a difference as not all pavements are the same.

Tyre noise is an important subject in North America as some states have drive-by decibel limits for vehicles and a couple of Canadian provinces have recommendations.

For more information, try the web sites for GoodYear and Michelin for starters. You may have to send some general requests to find out who can provide you with the information you need.

It's not really relevant, but one tyre manufacturing test house manager was telling me about the 'up market car manufacturer' that was complaining about the amount of noise the tyres were making. No oine in the car could hear it, but the engineer(?) insisted the noise was too great. It turned out that his meter was picking up the noise, but the pitch was outside the range of human (and most animals) hearing!!

I thought that the road noise comes from air being compressed between the road and the tire groove at the contact patch. as the patch moves forward the compressed air escapes at a frequency dependent on the tred geometry and the volume of the noise dependent on the air volume being compressed. But I could be wrong

hi every one

thanx for the info will u plz send me some specific info about the topic . the topic is very rear so im not able to get sufficient info