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Constant torque control in machining processes reduces the cycling time and energy consumption, while protecting the machine tool and cutting tool at the same time. This paper presents an adaptive fuzzy control system for optimizing the cutting torque in gear hobbing process. And during the machining process, the input and output scaling factors of the fuzzy controller can also be adjusted automatically...
A printed log-periodic dipole antenna (PLDPA) with balanced feed structure is proposed. The traditional feeding structure using a single coaxial cable and feed lines with equal width will lead to an unbalanced current distribution, thus, the radiation pattern performances a frequency dependent deflection status. In this paper, we have modified the width of two feed lines to compensate the effect of...
This paper studies the dynamic response of a highspeed ball-screw drive in a machine tool feed system. The Timoshenko beam theory is employed to model the rotating screw, while the nut is modeled as a lumped moving mass subjected to an external force resolved into three mutually perpendicular components. The dynamic model of the ball-screw drive is formulated based on the assumed mode method. To study...
For the cosecant square beam pattern application of an 8-element antenna array, we designed a 8-way non-equal power-divider based on Wilkinson scheme. An improved suspended stripline(SSL) structure is proposed and analyzed here, by using which as planar transmission line, the designed power-divider has good performance in the insertion-loss, and the excitations for output ports agree well with the...
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