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vibration

Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point. The word comes from Latin vibrationem ("shaking, brandishing"). The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road.
Vibration can be desirable: for example, the motion of a tuning fork, the reed in a woodwind instrument or harmonica, a mobile phone, or the cone of a loudspeaker.
In many cases, however, vibration is undesirable, wasting energy and creating unwanted sound. For example, the vibrational motions of engines, electric motors, or any mechanical device in operation are typically unwanted. Such vibrations could be caused by imbalances in the rotating parts, uneven friction, or the meshing of gear teeth. Careful designs usually minimize unwanted vibrations.
The studies of sound and vibration are closely related. Sound, or pressure waves, are generated by vibrating structures (e.g. vocal cords); these pressure waves can also induce the vibration of structures (e.g. ear drum). Hence, attempts to reduce noise are often related to issues of vibration.

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  1. nashant

    Vibration when first opening hot tap after u/v cylinder heating cycle

    Hi all. As the title says, I have a problem with an unvented cylinder I had installed last year where the first time I turn a hot tap on after the cylinder has been heated I get what sounds like a vibration. It generally starts about 1s after I open the tap and lasts for about 1.5s. I've...
  2. C

    hot water circulator pump vibration

    Hi everyone, My flat is located next to a communal boiler with a hot water circulator pump ( Grundfos UPS 15-50N Secondary Hot Water Circulator ). The pump is noisy and vibrating. Would installing a more powerful pump solve the problem? Many thanks for your help!
  3. jklondon

    Strong vibration foghorn sounds in system

    When we turn on the water first thing in the morning of after a while of non use there is vibration sound that can be heard to different degrees across the house. Its not instant but normally after a minute when the water has been turned off. It doesn't seem to be isolated to a particular...
  4. T

    Loud noise and vibration when hot water is used

    Recently over the past 2 months, the boiler or area by the water tank has started making a loud groaning noise whenever hot water has been running for much over a minute (sometimes less). Since the weather has gotten cooler, the radiators seem to come on (unless turned off at the TRV) whenever a...
  5. Mattkaye

    Guage vibration

    Has anybody come across this before? My pressure guage is vibrating and causing a horrendous noise in the pipes. Not sure if just changing the guage will fix the issue
  6. T

    Loud vibration noise near stopcock/PRV

    Hi everyone, We've got a loud vibration noise that seems to be coming from the area around our stopcock/water meter/pressure reducing valve. Two plumbers have failed to sort it, so I'm hoping someone out there can give us some clues. Here's the backstory: our combi boiler had to be replaced...
  7. R

    Loud vibration in pipes

    We have loud vibrations in our pipes. It happens when either of our showers is used about 10-20 seconds after the shower is turned off and stops after 5-10 seconds. It is very bad in the morning and gets better through the day. By late on the day it doesn’t really happen. There is a shower pump...
  8. D

    Vibration in floor....felt through out flat.

    #Rachiex put a post up which ended in 2017 concerning a vibration throughout the flat waking him/her up between 11 pm and 4 am - this is happening to me. it is felt during the wintertime both in 2019/20 and in 2020/21. as the warmer days have come in I am not feeling it. neighbour above has a...
  9. D

    New Boiler Stop/Start Loud Vibration - Valiant Ecotec Plus 615

    Hi all, Looking for some advice on a new Valiant Ecotec Plus 615 boiler, fitted a few weeks ago. It makes an on/off vibration shown in the video link below, and is loud enough for me to hear easily in the living room (I live in a 2 bedroom apartment and my boiler is in the bedroom). Our old...
  10. J

    Viessmann Vidotens 200w vibration noise

    Hi All, I had a Viessmann Vidotens 200w combi boiler installed recently and there is a vibration noise coming from the boiler for about 2 seconds if i turn on a hot water tap when central heating is on. The same noise can be heard a few seconds after a turn the tap back off. The pressure gauge...
  11. F

    Occasional Vibration noise after toilet filled

    Hi I have an occasional noise from the toilet. The toilet is less than a year old and sometimes after the toilet finishes filling back up there is a vibration noise. It doesn’t happen all the time. Just wondering what this could be. Thank you
  12. P

    Reduce Boiler Vibration?

    I have a new boiler in my loft. It's attached to the outside wall of the house. You can hear vibrations when it is on from 2 floors down in the living room. Is it possible to add dampners to the back of the boiler to reduce vibration down the side of the house? Are there other solutions?
  13. I

    Expansion Vessel Vibration

    First post after a lot of browsing and hoping for some insight into an on-going issue. I have a Glenhill unvented cylinder setup on my house. Installed 5 years ago (I’ve lived here for a year). Backstory: The expansion vessel was replaced in November as the last one had started to leak. No...
  14. A

    Worcester Greenstar 24i Junior - Vibration

    This boiler is giving me headache literally :eek: the best way to explain it is when the CH is first switched and the boiler is giving its all its spot on, running almost silent! Give it about 30 minutes or so when all the rads are up to temperature it then starts to slow down and gives out...
  15. L

    Toilet fill valve making vibration noise

    My toilet fill valve makes vibration noise every time I flash it. It stops for a few seconds if I use my hand to stop the watch coming out from the fill valve. Anyone has any idea what the problem it could be? Thanks
  16. G

    Vibration noise from boiler

    Hi folks I have a Worcester Greenstar CDI boiler which is about 7 years old. It has recently started making a vibrating noise periodically which can last from a couple of seconds to 60 secs at worst. It can happen throughout the day and night even when neither the heating or hot water is being...
  17. J

    Loud vibration from Radiator

    I have recently had Honeywell Evohome controls installed. Since this was done I have had loud noises coming from the radiators and pipes at random times. I have just had one radiator changed and I now have a MUCH louder noise but at least I can now create the conditions to cause it to happen...
  18. E

    Ideal istor thud/case vibration when turning off

    Hello all, I know the boiler doesn't have the best reputation but its generally worked well over the last 5 years or so. Having said that, I've recently noticed the boiler is making a thud and the case vibrates. The boiler is on a service plan until tomorrow with Homeserve and the chap that...
  19. N

    Burner motor to Oil Pump Vibration

    Hi I've fitter new motor to Inter 2011C burner which drives Danfoss BFP 11L3 oil pump. motor bearings are good fan rotates freely and without wobble. There's a vibration noise from the pump coupling area which I just can't seem to solve. If I slacken the pump mounts and move it slightly noise...
  20. R

    Vibration in floor...boiler/water heater?

    Can anyone offer any experienced or expert advice? I'm being woken most nights especially around 1am and again around 4 - 6am to my floor and bed vibrating. A neighbour has said his water heater/boiler had new valve fitted. He said it's noisy but didn't think it would cause vibration in my...
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