Graham Evans

Graham Evans

London, England, United Kingdom
2K followers 500+ connections

About

Director leading a talented and diverse global team of Technical Research Analysts behind…

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Experience

  • S&P Global Graphic

    S&P Global

    London, England, United Kingdom

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    London, United Kingdom

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    London, England, United Kingdom

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    London, United Kingdom

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    Gaydon, Warwickshire

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    Crewe, United Kingdom

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    Crewe, United Kingdom

Education

Licenses & Certifications

Publications

  • Transmission and Driveline Noise Target Setting using the Tone-in-Band Method

    INCE (Institute of Noise Control Engineering), Internoise 2013

    Paper 0761 (Contributed)

    Frequently, Transmission and Driveline-related noise issues are not identified until late in vehicle development programmes. These issues, typically characterised as ‘whines’, can be masked due to the high background interior noise of early development mules and prototype cars. As the vehicle matures, refinement improvements to other subsystems result in lower background interior noise levels, meaning whines become more pronounced and objectionable. Little time…

    Paper 0761 (Contributed)

    Frequently, Transmission and Driveline-related noise issues are not identified until late in vehicle development programmes. These issues, typically characterised as ‘whines’, can be masked due to the high background interior noise of early development mules and prototype cars. As the vehicle matures, refinement improvements to other subsystems result in lower background interior noise levels, meaning whines become more pronounced and objectionable. Little time is then available to resolve these issues or introduce revised parts. This is a growing concern with increasing customer expectations towards refinement, especially in the luxury car segment. In this paper the ‘Tone-in-Band’ Method is described and its application to the process of transmission and driveline whine target setting is proposed. A jury of assessors was subjected to whines of varying ‘Tone in Band’ levels, against a defined target level of vehicle background noise. The assessor’s responses were used to define ‘Audible’ and ‘Acceptable’ levels of whine in the cabin. These levels could then be transposed into Transmission and Driveline target lines for in-gear acoustic performance. Targets defined using the ‘Tone-in-Band’ Method have been applied twofold – to the evaluation of proposed components for improved Noise, Vibration and Harshness (NVH) and to the monitoring of vehicle maturation. Consideration is given to the merits of the ‘Tone-in-Band’ Method compared to other target setting tools for similar applications.

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  • Sound Metric Balance of Engine Cooling Fan Noise to enable Delivery of Good Exterior Sound Quality, SAE Paper

    Society of Automotive Engineers Conference, Grand Rapids, USA

    The drive for lower CO2 emissions places ever greater demand on cooling dissipation for a multi-cylinder internal combustion engine. This challenge has increased the requirements of the engine cooling system, particularly in countries where high ambient temperatures prevail and HVAC usage is high. Environmental necessity coupled with market demands have resulted in cars which emit a higher level of cooling fan noise which is intrusive in an urban environment and objectionable to…

    The drive for lower CO2 emissions places ever greater demand on cooling dissipation for a multi-cylinder internal combustion engine. This challenge has increased the requirements of the engine cooling system, particularly in countries where high ambient temperatures prevail and HVAC usage is high. Environmental necessity coupled with market demands have resulted in cars which emit a higher level of cooling fan noise which is intrusive in an urban environment and objectionable to customers.

    Conventional quantification of noise using traditional units and metrics was found to be insufficient for effective Sound Quality analysis. To assist Bentley Motors, a high performance luxury vehicle manufacturer, with its brand cachet and its commitment to the environment and customer, a new sound metric analysis has been devised to help the business deliver an ever-quieter exterior power unit cooling system.

    A rig simulating a vehicle cooling fan installation has been constructed to compare Bentley fans with competitor fans. Ranking the fans in terms of overall sound pressure level for a given fan speed was found to correlate poorly with the subjectively perceived ‘best’ fan. Sound metrics were used to characterise the fans, with ‘sharpness’ displaying good correlation with subjective perception of tonality and ‘loudness’ correlating well with flow noise. Furthermore, it was found that a linear balance between sharpness and loudness with increased speed led to improved perception throughout the speed range. Areas of poor balance were subjectively found to be speeds where either tonality or flow noise dominates human perception. Acoustic targets in terms of balance between sharpness and loudness were established for Bentley fans.

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Courses

  • ISVR - Human Responses to Vibration (Short Course)

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  • Ricardo UK Limited - Automotive Transmission Fundamentals

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  • Volkswagen Group AutoUni - Gesamtfahrzeug

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Languages

  • German

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  • French

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Organizations

  • Institution of Mechanical Engineers

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    - Present

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