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A novel method is proposed to actively attenuate the synchronous vibration of a magnetically suspended wheel (MSW) on the basis of shaft deflection. Considering the nonparallelism of the rotary axis and the inertial axis of the rotor, a precise dynamic model of the MSW is established as a linear model with synchronous disturbances. To reduce the synchronous vibration torques transferred to the base,...
Rectangular hexahedron sonotrode has remarkable advantage as a platform to realize auxiliary ultrasonic vibration of workpiece with its abundant resonant frequency. However, the three-dimensional coupled vibration characteristics of rectangular hexahedron sonotrode is hard to meet the requirement of ultrasonic assisted micro forming process, which should be made structural optimization for improving...
As a new branch of mathematics, Fractal Geometry has been widely used in civil engineering field. This study investigated its relationship between internal fractal dimension of aggregate fracture and surface porosity after destruction of coral aggregate concrete under pressure, cutting reveals the microlevel concrete aggregate injury characteristics
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