Projects per year
Nigel Johnston is a Reader in Mechanical Engineering. He specialises in the areas of fluid-borne noise measurement and reduction in hydraulic fluid power systems, active noise control, numerical modelling of hydraulic components, unsteady turbulent flow, pipeline and hose dynamics.
Nigel Johnston studied the measurement and prediction of pressure ripple in hydraulic systems for his PhD. This work has since been used as the basis for an ISO Standard for the measurement of pump pressure ripple characteristics. He was appointed Lecturer in 1990 and Senior Lecturer in 2003.
He has supervised 18 PhD students to completion.
He regularly teaches on industrial fluid power courses in the UK, Europe and USA. He is Organiser and joint Editor for the Bath/ASME International Fluid Power and Motion Control Symposium.
Nigel Johnston has over 30 years’ experience in hydraulic fluid power research and teaching. He obtained his PhD for research into fluid-borne noise characteristics of hydraulic systems. This work has since been used as the basis for an ISO Standard for the measurement of pump pressure ripple characteristics.
He has also been involved in research into: active noise control, cavitation, numerical modelling of fluid power components, unsteady turbulent flow, pipeline and hose dynamics, pump condition monitoring, vehicle steering dynamics and aircraft fuel systems. He has published about 100 refereed journal and conference papers and has collaborated with several companies including Delphi Steering Systems, General Motors, Airbus, John Deere, Sun Hydraulics, Parker Hannifin and BMW.
He recently led a large research project looking into efficient fluid power systems, funded by EPSRC with industrial collaboration. In most hydraulic fluid power systems, valves are used to throttle the flow and reduce the hydraulic pressure. This is a simple but extremely inefficient method as the excess energy is lost as heat, and it is common for more than 50% of the input power to be wasted in this way. Novel methods are being investigated for increasing the efficiency of hydraulic systems whilst maintaining performance, cost-effectiveness, reliability and low noise. The potential for improvement is huge. Reducing power consumption will contribute to the UK Government's commitment to cutting carbon dioxide emissions. However there are significant challenges.
Willing to supervise doctoral students
Interested in supervising students studying;
- Efficient fluid power systems, including digital switching valves
- Aircraft and automotive hydraulic systems
- Fluid-borne noise in hydraulic systems: measurement, analysis, active control
- Hydraulic component and system dynamic modelling
- Unsteady laminar and turbulent flow in pipes and hoses
Doctor of Philosophy, University of Bath
Award Date: 1 Jan 1988
Bachelor of Science, University of Bath
Award Date: 1 Jan 1984
1/01/15 → 1/07/15
Project: Research-related funding
1/10/10 → 31/03/11
Project: Research council
Hultin, A. O., Gopsill, J. A., Johnston, N. & Newnes, L. B., 29 May 2020, In : arXiv.
Research output: Contribution to journal › ArticleFile9 Downloads (Pure)
Johnston, D., 1 Mar 2020, In : Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering. 234, 3, p. 299-313
Research output: Contribution to journal › ArticleOpen AccessFile37 Downloads (Pure)
The impact of biodiesel and alternative diesel fuel components on filter blocking through accelerated testing on a novel high pressure common rail non-firing rigGopalan, K., Raikova, S., Smith, C. R., Bannister, C. D., Savvoulidi, M., Chrysafi, S., Johnston, N. & Chuck, C. J., 8 Aug 2020, In : Fuel. 282, 118850.
Research output: Contribution to journal › Article
Plummer, A. & Johnston, N., 1 May 2018, In : International Journal of Hydromechatronics. 1, 1, p. 47-71
Research output: Contribution to journal › ArticleOpen AccessFile81 Downloads (Pure)
Johnston, D., 17 Oct 2017.
Research output: Contribution to conference › Paper