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RF power amplifiers (PA) are a major source of nonlinearity in a communication system. Accurate behavioral models are indispensable for PA linearization. To describe nonlinear characteristics of power amplifiers, a support vector machine (SVM) based modeling method is presented. The kernel approach and duality theory are employed to train the PA model. Simulation results show that the proposed model...
The mathematical model of and the solution to cylindrical form error separation are presented in this paper. The roundness, the radius error of different cross sections and the initial coordinates of the least square centers of measured cross sections can be separated by this technique. Meanwhile, the rotation motion error of spindle and the rectilinear motion error of guide way can be separated effectively...
The involute spline made by cold-rolling have many advantages. This method can increase the production efficiency, save material, prolong the cutting tool's life, and improve the dimensional accuracy. Because the metal fiber continues between the spline's teeth, wearing resistance of the spline's teeth side is better and intensity of the teeth is higher. The cold rolling is the development trend of...
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