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Aston Martin Lagonda Limited is a British manufacturer of luxury sports cars and grand tourers. It was founded in 1913 by Lionel Martin and Robert Bamford.The firm became associated with luxury grand touring cars in the 1950s and 1960s, and with the fictional character James Bond following his use of a DB5 model in the 1964 film Goldfinger.The company has had a chequered financial history, including bankruptcy in the 1970s, but has also enjoyed long periods of success and stability, including under the ownership of David Brown, from 1947 to 1972 and of the Ford Motor Company from 1994 to 2007.In March 2007, a consortium of investors, led by David Richards, purchased 92% of Aston Martin for £479 million, with Ford retaining a £40 million stake.David Richards became chairman of Aston Martin. In December 2012, the Italian private equity fund Investindustrialsigned a deal to buy 37.5% of Aston Martin, investing £150 million as a capital increase. Wikipedia.

Morris N.,Loughborough University | Rahmani R.,Loughborough University | Rahnejat H.,Loughborough University | King P.D.,Loughborough University | Fitzsimons B.,Aston Martin Lagonda Ltd
Tribology International

Fuel efficiency is the main IC engine attribute, with the compression ring-bore contact consuming nearly 5% of the fuel energy. Analyses are often idealised, such as isothermal condition and smooth surfaces, the former being particularly contrary to practice. An analytic solution to the average flow model is presented for this contact with a new analytical thermal model. The generated contact temperatures, particularly at the inlet result in thinner films than the idealised analyses. For the simulated city driving condition the power loss is mainly due to viscous shear under cold engine condition, whilst for a hot engine boundary friction dominates. © 2012 Elsevier Ltd. Source

Baker C.E.,Loughborough University | Theodossiades S.,Loughborough University | Rahnejat H.,Loughborough University | Fitzsimons B.,Aston Martin Lagonda Ltd
Journal of Engineering for Gas Turbines and Power

The compression ring-bore conjunction accounts for significant frictional parasitic losses relative to its size. The prerequisite to improving the tribological performance of this contact is a fundamental understanding of ring dynamics within the prevailing transient nature of the regime of lubrication. Studies reported thus far take into account ring-bore conformance based on static fitment of the ring within an out-of-round bore, whose out-of-circularity is affected by manufacturing processes, surface treatment, and assembly. The static fitment analyses presume quasi-static equilibrium between ring tension and gas pressure loading with generated conjunctional pressures. This is an implicit assumption of ring rigidity while in situ. The current analysis considers the global modal behavior of the ring as an eigenvalue problem, thus including its dynamic in-plane behavior in the tribological study of a mixed-hydrodynamic regime of lubrication. The results show that the contact transit time is shorter than that required for the ring to reach steady state condition. Hence, the conjunction is not only subject to transience on account of changing contact kinematics and varied combustion loading, but also subject to perpetual ring transient dynamics. This renders the ring-bore friction a more complex problem than usually assumed in idealized ring fitment analyses. An interesting finding of the analysis is increased ring-bore clearance at and in the vicinity of top dead center, which reduces the ring-sealing effect and suggests a possible increase in blow-by. The current analysis, integrating ring in-plane modal dynamics and mixed regime of lubrication, includes salient features, which are a closer representation of practice, an approach which has not hitherto been reported in literature. © 2012 American Society of Mechanical Engineers. Source

Aston Martin Lagonda Ltd | Date: 2010-08-26

A motor car (

A window assembly (

Aston Martin Lagonda Ltd | Date: 2012-12-20

A cycling vehicle (

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