It is believed that in the design of the drive spring, it is necessary not only to use the usual static calculations but also to analyse the dynamic stress so as to obtain rational dimensions.

作者建议在设计复进簧时，不仅运用传统的静载计算，还要进行动态应力分析，以便获得较合理的尺寸。

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This torch works by storing energy in a hand-wound spring, and then using that energy to drive a dynamo.

ECONOMIST: Taking the heat out of gynaecological examinations

With total production amounting to a five-figure number, from the spring of 2012 the further developed smart fortwo electric drive will start winning wide-ranging buyers in more than 30 countries for an innovative and forward-looking drive concept.

ENGADGET: Third generation Smart Fortwo ditches Tesla powertrain, gains two wheeled cousin

It would offer creative leasing, letting you drive a Chevy Corvette during the summer, a Cadillac Seville STS during the fall and spring and a GMC Yukon during the winter.

FORBES: Digital rules