About
I always dreamt of running my own business whilst also enjoying the co-opetition of being…
Experience
Education
Publications
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Exhaust sound quality design for a variable displacement engine
Aachen Acoustics Colloquium, Germany
A novel design of exhaust system to balance the refinement requirements of a variable displacement engine whilst generating sporty acoustic character.
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Metric balance technique for the sound quality development of cooling fans
Internoise, New York, USA
This paper explains the development of a novel sound quality metrics-balance technique to assess suitability of fans for noise comfort and pleasantness.
Other authorsSee publication -
Sound quality design and development for the new Bentley Continental V8
Internoise, New York, USA
Design and development of the class leading unique balance of acoustic character (sound quality) and noise & vibration refinement of the Bentley Continental V8 Grand Tourer and Grand Tourer Cabriolet, while addressing the refinement challenges of variable displacement engine.
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Use of full vehicle noise, vibration & harshness (NVH) simulator in the development of power-train mounting systems
Internoise, New York, USA
Use of a full-vehicle noise, vibration and harshness (NVH) simulator to develop powertrain mounting systems. This technique was developed in order to reduce the costs of physical prototyping and testing and develop mounting systems balancing the attributes of powertrain isolation and ride comfort.
Other authors -
Achieving a Positive Driver Emotional Response on the New Bentley Continental V8
Engineering Integrity Society, UK
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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.Other authorsSee publication -
Vehicle Refinement Challenges for a Large Displacement Engine with Cylinder Deactivation Capability, SAE Paper
Society of Automotive Engineers
Ever increasing challenges on reducing emissions and improving fuel economy has led to the development of not only alternate fuels but also new Powertrain technologies. One such technology employed within the new Bentley Mulsanne is cylinder deactivation, where 4 out of 8 cylinders of a large displacement V8 engine are turned off during light load conditions.
This paper identifies the considerations and technical development that was undertaken to deliver limousine levels of cabin…Ever increasing challenges on reducing emissions and improving fuel economy has led to the development of not only alternate fuels but also new Powertrain technologies. One such technology employed within the new Bentley Mulsanne is cylinder deactivation, where 4 out of 8 cylinders of a large displacement V8 engine are turned off during light load conditions.
This paper identifies the considerations and technical development that was undertaken to deliver limousine levels of cabin refinement with imperceptible half engine mode operation under cruise conditions whilst achieving the desirable sporty character of a large V8. A practical approach to transfer path analysis incorporating structural path disconnections and exhaust orifice routing and its benefits are discussed. The selection of a dual mode exhaust, employment of specific half engine mode torque converter slip strategy and the development of a power unit mounting system for both isolation refinement and power unit control are presented.Other authorsSee publication
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