Steve Jones

Work place: Institute for Advanced Manufacturing Engineering (AME)



Research Interests: Engineering


Professor Jones was Rolls-Royce’s global engineering specialist providing welding and brazing engineering solutions. His work in developing Rolls-Royce’s Shaped Metal Deposition process for producing 3DP-AM jet engine parts led him to receiving the Company’s Operational award for innovation, leading to several patents, in addition to the Leslie Lidstone Medal; the Welding Institute’s international award for engineers who have made the most significant contribution to welding in the world. Professor Jones has also provided novel electron beam welding solutions applied to aircraft fuel sensory systems and was the main welding advisor for Rolls-Royce Marine systems in producing the shiplift ™ manipulating equipment that positioned the Venice MOSE flood barrier. He is also a visiting professor of the University of Sheffield/Nuclear Advanced Manufacturing Centre, a UK contributor to the American Society of Mechanical Engineers Section IX, the UK’s representative for Resistance and Solid-State welding as well as brazing and soldering sciences, a working party member of the RCC-M nuclear welding and fabrication committee and Chairman of the Examination Board of The Welding Institute.

Author Articles
Enhancing Noise Attenuation in Exhaust Mufflers on Response to Baffle Configuration

By Ahmed Elsayed Christophe Bastien Humberto Medina Steve Jones Hassan Kassem

DOI:, Pub. Date: 8 Jul. 2017

Using baffles in exhaust mufflers is known to improve transmission loss and reduce the noise emitted to the environment. This paper postulates that baffle cut ratio affects the muffler performance in the same effect as a shell-and-tube heat exchanger, consequently the baffle cut ratio should affect the muffler performance. This study presents a parametric study on the effect of baffle configuration on predicted transmission loss and pressure drop. The effect of baffle cut ratio, baffle spacing, number of baffle holes, and hole pattern distribution on transmission loss was investigated. Results showed that reducing the baffle cut ratio increased the transmission loss at intermediate frequencies by up to 45% while decreasing the spacing between muffler plates improved the muffler transmission loss by 40%. The assessment of the baffle effect on flow using a thermal baffle approach model indicated a sudden drop in fluid temperature in axial flow direction by 15% as the baffle cut ratio changed from 75% to 25. To the best of authors knowledge, the effect of baffle cut ratio configuration on acoustic response and back pressure has not been previously reported or investigated.

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