The instability regions, the vibration amplitude and the range of fluctuation of the driving torque for a double crank-and-rocker mechanism are illustrated graphically.
Using this method, satisfactory four-bar linkages can be obtained such as crank rocker mechanism, double-rocker mechanism and double-crank mechanism for the given four, five or more than five rigid-body positions.
In addition to the approach for function generation, tandem design for the following types of planar linkages has been developed: double-crank linkage, crank-slider linkage and Scotch Yoke mechanism.
The Flapping-wing Micro Air Vehicle (FMAV), with a 50 cm wingspan and a double-crank drive system, performed successful flights of up to 23 min. The performance and capabilities of the FMAV were enhanced by adapting a number of unique features, such as a bird-mimetic wing shape with a span-wise camber and an up-down and twisting wing drive mechanism with double-crank linkages.
A comprehensive wind tunnel test shows that the FMAV with a high-camber wing and double-crank mechanism generates more lift and less net thrust than the FMAV with a flat wing and single-crank mechanism, which confirms the improved performance of the developed FMAV, as well as the superior slow flying or hovering capabilities of the FMAV with a high-camber wing and double-crank wing drive system.
Published in the journal Plos One, the study explored the impact of using a double bridle and crank noseband on the behaviour of 12 horses that had not worn the equipment before.
So Guyer cranked a double to right-center that scored a run.
The dress goes with the oddity of the terms "grinding" or "cranking" used to in the article to describe camerawork, slyly invoking the double meaning of the slang "crank" for operator without exactly saying that a woman behind a camera is bad-tempered.
To make it work, they'll have to crank up the lasers, doubling their output compared to these initial experiments.
On the first pitch, Hall cranked a ground-rule double to left, scoring J.J. Hardy with the tying run and sending Glavine's 30 friends and family members who were sitting beside the Mets' dugout into despair.
