Industrial Noise
& Vibration Centre

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Remote control of noise by email

“Click here” to solve your noise problem…

How does the prospect of solving your noise problem quickly, efficiently and at low cost by email sound? We have the technology…

For an increasing number of noise problems – especially environmental noise sources – we can acquire the diagnostic information we need by smartphone via email rather than making site visits. We can then provide you with a detailed solution by email that you can implement in house or using a local contractor. Fast, efficient and low cost.

Noise Control by Remote Control – the Process…

  • Contact Us – call to discuss the noise problem and the information we need.
  • Email us Information / recordings – photographs, noise levels and sound recordings / video sample (if required).
  • Analysis and Diagnosis – we review the data; strip and analyse the video sound-track; assess the options against our noise control database and past experience. Provide you with the detailed results and / or an assessment of the noise control options using current Best Available Technology with estimates of the costs and potential noise reductions. This can then be used as evidence of what constitutes best practice to solve the problem. As the solution is usually so much cheaper, simpler and easier to implement than previously expected (see case studies for examples), it becomes the obvious next step.
  • Detailed Noise Control Recommendations – in many simple cases, we can subsequently provide detailed low cost noise control recommendations based on the information supplied. This includes drawings, material specifications and potential suppliers in sufficient detail for a local contractor to implement the recommendations. In more complex cases, a site visit would be required at this stage.
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Remote Control of Fan Noise

aerodynamic fan noise reduction - attenuation without silencers

Reduce fan noise at source without attenuators using aerodynamic modifications

We have carried out numerous fan noise control projects across the globe. Use the following procedure to get an evaluation of the costed options – or a second opinion –
free of charge. Where our innovative fan noise control technology is appropriate, 80% cost savings and 20% improved efficiency are typical compared with conventional silencing.

  1. Photos of the fan installation – both of the fan itself (from both sides) and of the surrounding structure (ductwork, stack etc).
  2. For environmental noise problems, a smartphone audio recording or short video clip (c 20 secs) taken at a location where you can clearly hear the fan tonal noise, but at some distance from the fans themselves. Usually, the best location is either out towards the problem area (if you can clearly hear the fan during the day and there are few other noise sources to interfere) or at the site boundary. In either case, we need a recording that illustrates the problem noise – i.e. play it back to check you can hear the drone / tone / hum etc.
  3. Short audio or video recording close to the fan (c 2m – 5m) for the local noise environment.
  4. Fan speed and number of blades on the impeller.
  5. Repeat the above for each fan if there are multiple fans – although we may only need one off-site recording.
Email the above to us and we can then analyse the sound-track / recording for tonal content and match it with the physical characteristics of the fans. At this point, we can usually cost the noise control options using current best practice.

Remote Control of Noise Case Studies

Wood Burning Power Station Fan – USA: silencer replaced to improve efficiency

The efficiency of a 3m, 1.5MW wood burning boiler fan installed at Schiller power station in New Hampshire as part of one of the largest renewable energy projects in the U.S. was dramatically improved by replacing a power station wood burner fan noise reduction at sourcetraditional silencer with our aerodynamic noise control technology. The fan feeds into a stack which had a large conventional silencer installed to prevent high noise levels disturbing local residents. As the silencer had a drastic impact on fan efficiency, it was later removed and replaced with our aerodynamic source control technology. The retro-fit not only eliminated the low frequency tonal noise problem at a tiny fraction of the cost of the silencer it had usurped, but as it restored the fan to full efficiency, it paid for itself very quickly.

This international project was managed remotely from our UK offices. By analysing and interpreting data acquired locally to our specifications, we were able to dispense with site visits.

Offshore Hydraulic Power Pack Acoustic Enclosure Design
hydraulic power pack acoustic enclosure panel and silencer designThe manufacturer of hydraulic power packs for offshore use had to meet a tight customer noise specification. As the pack had to be fitted with a frame anyway, we designed the technical features of the acoustic enclosure panels and silencers in conjunction with SoundDampedSteel who supplied both the highly damped laminated steel used and the enclosure itself. Our involvement was carried out entirely by email and mobile phone (live pictures from site).

Vibrating Sieve Diagnosis and Control
Analysis of the video sound-track shot outside the complainant’s house and close to potential noise sources on an industrial site allowed us to pin-down the source of the low frequency tone that had been the cause of long term complaints. Based on the mechanical information provided, we proved that the culprit was not the fan previously diagnosed locally, but a vibratory sieve. We then provided a virtually cost-free modification (mechanical disconnection from the building steelwork) to solve the problem. The whole process cost a few hundred pounds and only took a few days.

Vane Compressors Installation and Retro-Fit Intake Silencers
A pair of air compressors installed in a plant room were generating noise levels well above the specified 80dB(A). We discussed the installation with the contractor, who then took some basic noise measurements plus photographs which were forwarded by email. We designed the silencers and wall treatment, returned the recommendations and solved the problem within a few days. The whole project cost less than a site visit…

Large Industrial Fans
As a result of complaints about noise from 2 large centrifugal fans on a factory roof, the company spent £40k – £50k on acoustic lagging – which had no effect on noise levels. The result was a prolonged wrangle with the authorities – who eventually asked the company to get a 2nd opinion from us.

They forwarded a video-clip. Analysis of the sound-track proved that the problem was a pair of tones at the blade-pass frequencies of the fans and 1st harmonics that were interfering and “beating” with each other. We designed the solution (Quiet Fan technology – retro-fit attenuation without silencers) that eliminated the tones as a feature within a few weeks and at a fraction of the cost of conventional alternatives and with only a single site visit required – the rest of the work was done by email.fan-noise-control

Garage Dealership Office Chiller Noise Control
garage chiller noise reduction eliminates noise nuisanceHighly tonal noise from these chillers had been the cause of complaint for someconsiderable time. The company had already attempted acoustic enclosure with theresult that the chillers had over-heated. The EHO sent us sound recordings, photographsand noise levels. Once analysed, we were able to say that the noise problem could beresolved for a few hundred pounds without running the risk of chiller problems. Once thisinformation was passed on to the garage, they contacted us and we supplied them withdetailed drawings that they used to get the silencers made locally. Problem solved…

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INVC

INVC