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For winding systems, aligning control is important to assure good winding quality. This research proposes a winding control system with a front aligning mechanism and a rear aligning roller to achieve good front and rear lateral alignment of winding strips. The front aligning mechanism uses one set of a servo motor and a ball screw to tilt a front aligning roller about the hinge located at the midpoint...
Wire electrical discharge machine (WEDM) is one of the effective and important methods for machining complex parts and hard cutting materials. The power supply plays an important role in WEDM, which influences the machining precision and cutting speed. The energy efficiency of traditional pulse power for WEDM is less than 25%, because of the use of current-limiting resistance. In the paper, a novel...
Coated carbide milling inserts are very widely used in modern metal cutting. Affected by interaction such as thermo-mechanical coupling, the cutting process of coated carbide milling inserts with 3D groove is rather complicated. In this paper, a measurement system of transient cutting temperature is developed by both non-contacting and contacting methods. Based on the comparative cutting experiment...
The thermal stress in dual-damascene Cu interconnects with different via geometry and dielectric materials combination was simulated using the finite element method. The simulation results are presented to show that a small via linked to a wide and large Cu block increases the risk of electro-migration and stress migration failure. Vias in cylinders will drastically reduce thermal stress of the entire...
This paper presents an innovative micromechanical bandpass filter using free-free beam resonators and torsional coupling beams for VHF applications. The rationale for adopting free-free beam resonators is that the free-free beam resonators would experience less anchor loss than a clamped-clamped resonators. ANSYS simulation shows that the proposed free-free beam filter possess less anchor loss. Finally,...
The microstructure, gas tightness and ionic conductivity of plasma-sprayed yttrium stabilised zirconia coating is evaluated. Results show that the gas permeability and ionic conductivity of coating was improved by increasing the in-flight particle temperature.
This research uses spiral microstructures to measure both the residual mean normal stress and gradient stress of the thin films for MEMS devices based on analytical solutions. The geometric or dimensional deformations are utilized to determine the residual stresses. ANSYS simulation and experiments are conducted to verify the measurement.
Tins paper presents the comparison of signal quality and efficiency performance between simulation and experiment for a linear RF transmitter based on a hybrid quadrature polar modulation (HQPM) architecture with digital predistortion scheme. Adjacent channel power ratio (ACPR) with and without applying the baseband predistorter are both shown to demonstrate improvement in transmitter linearity. The...
This paper presents a Class-E power amplifier (PA) realized in GaAs HBT technology for hybrid quadrature polar modulation (HQPM) application. A digital predistortion scheme is implemented to improve the linearity between supply voltage and output envelope of realized Class-E PA for HQPM application. The developed system prototype is capable of transmitting CDMA2000 1x signal very efficiently.
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