Based on grey system theory, a weighted grey correlation model is built, the composite efficiency of mechanical equipments is evaluated to supply a reference for equipment optimization.

以灰色系统理论为基础，建立加权灰关联分析模型，对机械设备进行综合效益评价，为设备选优提供决策依据。

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The 787 is the first airliner made mostly from lightweight composite materials, which increases an aircrafts fuel efficiency.

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Part of the Dreamliner's appeal to airlines is its increased fuel efficiency due to its construction of lightweight composite materials instead of metal.

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Airbus' A380 superjumbo and Boeing's upcoming 787 Dreamliner both use new engine designs, lightweight composite materials and advances in aerodynamics to improve performance, increase fuel efficiency and lower emissions.

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