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Author Topic: Clickity clack and clickity clock  (Read 447 times)

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Offline BobB

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Clickity clack and clickity clock
« on: April 07, 2018, 06:50:17 am »
Have you noticed the rhythm and sounds as a train passes you ? Does anybody know the dynamics that cause the second axle's wheels to be a different sound from the first, and for a bogie coach or wagon, the second bogie to be different from the first ?

When I run my trains on either the club layout or my test oval (both of which have some fairly large gaps in the joins) I can also hear the same rhythm so it has to be the same thing happening.

Offline joe cassidy

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Re: Clickity clack and clickity clock
« Reply #1 on: April 07, 2018, 06:52:48 am »
Doppler effect ?

Offline Tom U

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Re: Clickity clack and clickity clock
« Reply #2 on: April 07, 2018, 07:41:16 am »
I think the axles are too close together for a doppler effect to be audible.

I would suggest that it is the bogie loading: (vague theory only).
The front wheels hit the gap with the bogie in a stable state, the aft wheels encounter the slot whilst the bogie is still recovering from the upset of the front wheels, so the dynamics and loadings are different.

Offline Bealman

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Re: Clickity clack and clickity clock
« Reply #3 on: April 07, 2018, 07:48:16 am »
Hmm..... most interesting!  :hmmm: :hmmm:
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Offline emjaybee

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Re: Clickity clack and clickity clock
« Reply #4 on: April 07, 2018, 03:06:32 pm »
Slow news day?

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Offline Intercity

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Re: Clickity clack and clickity clock
« Reply #5 on: April 07, 2018, 03:15:55 pm »
The sound of the wheel making contact with the next piece of rail sounds different to the next one because the density (probably the wrong wording) of the rail changes, the first wheel is hitting plain rail, the next one is hitting the same thing but with the first wheel adding to the weight, likewise for the rest of the wheels.

Hopefully you understand what I mean, difficult to find the right wording to explain it correctly.
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Offline BoxTunnel

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Re: Clickity clack and clickity clock
« Reply #6 on: April 07, 2018, 10:01:12 pm »
The sound of the wheel making contact with the next piece of rail sounds different to the next one because the density (probably the wrong wording) of the rail changes, the first wheel is hitting plain rail, the next one is hitting the same thing but with the first wheel adding to the weight, likewise for the rest of the wheels.

Hopefully you understand what I mean, difficult to find the right wording to explain it correctly.

Perhaps compression?  The first wheel hits the rail and compresses it slightly, hence the different sound when the second wheel hits it.

However, the clackety clack always sent me to sleep (so much so that several times I awoke in Bath Spa station when I should have alighted in Chippenham) so I'm afraid my knowledge is limited to the first few hundred yards out of Swindon!

Graham. yawn...
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Offline BobB

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Re: Clickity clack and clickity clock
« Reply #7 on: April 08, 2018, 08:18:31 am »
It's possible that deformation (compression) of the rail is causing the difference in sound (about 4 ton load per wheel for a Mk 1 coach) but I doubt this is significant for our little models. Any other ideas ?

Offline Tonye

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Re: Clickity clack and clickity clock
« Reply #8 on: April 08, 2018, 10:07:15 am »
 :hellosign: And now we have welded rail!. The Isle of Man steam railway has lost its clickety clack which is a shame as the sound of the wheels knocking over the rail joints was part of the steam era.
Tonye

Offline PLD

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Re: Clickity clack and clickity clock
« Reply #9 on: April 08, 2018, 09:10:17 pm »
Is there really a different sound from each wheel or is it human perception because we were told when we were young that it was "clickety-clack"???

There is (or should be) a different rhythm from a train of bogie vehicles (short-long-short-short-long-short beats) compared to a train of 4 wheel vehicles (with typical 10ft wagons almost even beats)

Offline Newportnobby

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Re: Clickity clack and clickity clock
« Reply #10 on: April 08, 2018, 09:47:06 pm »
Is there really a different sound from each wheel or is it human perception because we were told when we were young that it was "clickety-clack"???


I always thought with coaches it was a 'diddlee dum, diddlee di' noise :dunce:
There was no mistaking the sheer din of a long train of mineral wagons passing 6ft away!

 

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