Short courses, meetings and conferences
ISVR Consulting, the ISVR and the Faculty of Engineering and Physical Sciences offer regular courses in various aspects of noise and vibration. Some courses are designed to give an introduction for those new to noise and vibration, while other courses are more specialised. The courses are open to everyone.
Meetings and Conferences
Malcolm Smith and Erika Quaranta of ISVR Consulting will be presenting a paper, Specification and design of silencers for control of low-frequency noise from an environmental test facility, on Tuesday 12 October 2021 at Acoustics 2021 . This is a ‘hybrid’ conference from the Institute of Acoustics which will be held on Monday and Tuesday, 11 and 12, October 2021.
Simon Roberts will be giving a presentation on Application of Active Noise Control to Transport Systems to the Institute of Acoustics Noise and Vibration Engineering Group, via Zoom, at 1pm on 23 November 2021.
There has always been a requirement for reducing weight and improving comfort in transport systems but, for both commercial and environmental reasons, these have become increasingly significant. Since its development in the 1980s, Active Noise Control (ANC) has offered a route to achieving these two, conflicting, aspirations. The massive increases in computing power and developments in the algorithms available which have taken place since then, are now bearing fruit, and ANC is finally achieving the market penetration it has always aspired to.
This presentation will outline the background of ANC and its application to transport systems. It will provide an overview of the technology, the algorithms used, the benefits it can bring, and the limitations. Applications to planes, trains and automobiles will be discussed, and how the latest developments are being incorporated into the move towards vehicles as entertainment spaces.
Erika Quaranta and Malcolm Smith of ISVR Consulting recently presented two papers at the Internoise 2021 conference which was held online from 1 to 5 August 2021. The abstracts are below and the full papers are can be downloaded from our reprints page.
Design of axial flow fans for reduced noise and improved
efficiency. Erika Quaranta and Malcolm Smith.
Axial flow fans are used in a wide variety of applications, from cooling systems for electronics to ventilation in buildings. Whatever the application, there will be competing design constraints which make it difficult to achieve the required pressure-flow performance characteristic, within a specified space envelope, whilst meeting a target aerodynamic efficiency and noise level. This paper describes a design methodology for optimizing aerodynamic performance and noise. It is based on use of a semi-analytic 2‑D design tool for preliminary predictions and design, combined with a 3‑D numerical CFD analysis to visualize the flow. Both models can be extended to the design of multi-stage systems. The 2‑D model predicts the flow velocity at the trailing edge of the blades for each point on the fan performance curve, which is then used to estimate self-noise characteristics of the rotor using a classical model of airfoil trailing edge noise. The CFD analysis provides detailed validation of assumed airfoil characteristics, including the effect of 3‑D design features such as blade sweep, and confirms the flow and aerodynamic efficiency predictions; it can also used to estimate parameters such as turbulence intensity that is a key driver for the noise level.
Control of low frequency noise from an environmental test
facility. Malcolm Smith and Erika Quaranta.
Environmental test chambers are used in the automotive industry to verify the resilience of vehicles. In just a few hours it is possible to take a car from mid-winter in the artic, via a high mountain range, to mid-summer in a desert. Powerful ventilation systems are used to change the temperature, pressure and humidity of the air in the chamber, and the variable speed blowers are a major source of low-frequency noise, which can cause significant disturbance at neighbouring properties if there are gaps in silencer performance. This paper details a study to assess the attenuation requirements for a system to meet a standard criterion for low-frequency far-field noise levels, and to select a reactive silencer system to achieve that specification under all circumstances. The system used standard silencer components where possible, but needed to take account of long pipe runs through the facility, with tailpipe resonances being a particular issue, and was further constrained by space and loading limits for the building. Design layouts were verified using the Actran FE code, taking account of interactions with existing silencers and transfer functions to the far-field, in order to have very high confidence of a successful outcome.
ISVR Consulting staff regularly present papers at meetings, conferences and workshops, and further events will be announced here.
ISVR Consulting can also provide special courses tailored to the needs of individual companies or industries. Examples of possible topics include
- noise control,
- silencer design and exhaust systems,
- various aspects of engine noise, vibration and harshness (NVH),
- low-noise design,
- insight into building acoustics,
- use of noise and vibration instrumentation,
- noise control of leisure craft.
These courses, which are typically one or two days in length, may be
held either in Southampton, or at a client’s premises. If you would
like a course tailored to your needs, please
contact us, without obligation, to discuss your requirements.
Short courses and workshops
Details of short courses and continuing professional development opportunities at the ISVR and in the School of Engineering are available on line.