ENGINEERING
microscope. Luckily for the contractor, the acoustic consultant had crafted quite a tight specification that required continual submissions of evidence to demonstrate that the requirements had been met. The normal methods of isolation would
not work, so instead we designed a bespoke system of air springs. Each air spring is a rubber carcass, and pressure is supplied via gas cylinders. Air springs have very little resonant response, thus providing a high level of stability and higher levels of isolation than could be provided by rubber springs. Air springs typically achieve natural frequencies of 2 Hz, but it is possible for well-engineered systems to surpass this level of isolation. Once complete, the entire system is raised on these air springs, interrupting the transmission path for ground-borne sources of vibration.
‘Niche’ solutions The above example is a highly specialised, niche area of engineering, but without solutions such as these it would be difficult to operate sensitive equipment in areas where there is substantial traffic, or in buildings with high levels of footfall. I suspect that across the country there are many scientists who choose to carry out experiments using sensitive equipment at unusual hours to avoid the interference caused by vibration-generating activities.
Adam Fox
Mason UK provides products, solutions, and expertise for vibration isolation problems.
Adam Fox CEng, MIMechE, AMIOA, is an engineer with long experience in vibration control. After graduating from university with a degree in Engineering, he began working in defence research for the automotive and aerospace industries, before moving to Mason UK, the exclusive UK agent for Mason Industries. Here, he has since gained significant experience in the engineering of building acoustics, structural isolation, and isolation of mechanical systems, which includes seismic and blast criteria. He has also worked on multiple projects involving highly sensitive equipment for scientific and high-precision manufacturing applications. He has been a director at Mason UK since 2018, and, in addition to his work as an engineer, helps deliver RIBA-approved CPD seminars on a wide range of acoustics and vibration control-related matters.
However, most don’t realise that engineering solutions do exist to these problems. The first step is the writing of a tight specification, and the next is working with an engineering team who are willing to embark on the continual back-and-forth process that is typically involved in making sure that the ‘specs’ are fully satisfied.
Conclusion If you make sure that you are addressing the ‘how’ question, and doing so with the appropriate level of detail in your criteria, you will have a tight specification.
If you go to the additional length of requiring the contractor or supplier to provide evidence that the specification has been met, you then ensure that your original intention is not lost along the way. Although it might entail slightly higher upfront costs, the risk to your project will be reduced, and the whole-life costs to the end-user will likely be lower too. However, when it comes to healthcare facilities, where the challenges of isolation can throw up unusual requirements, the specification is often simply the start of a long process.
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