- Eklemek veya çıkarmak istediğiniz kriterleriniz için 'Dahil' / 'Hariç' seçeneğini kullanabilirsiniz. Sorgu satırları birbirine 'VE' bağlacı ile bağlıdır. - İptal tuşuna basarak normal aramaya dönebilirsiniz.
The variational iteration method has been attracted much attention of researchers as a promising method for solving linear and nonlinear differential equations. This study presents a way of using the variational iteration method (VIM) to solve free vibration problems of uniform Euler-Bernoulli beams. The method depends on constructing a correction functional by a general Lagrange multiplier. An example is given to illustrate the accuracy and efficiency of the present method. Each iteration step gives a direct approximate solution to the problem. It is verified that the method is a powerful mathematical tool to get the solutions easi . . .ly by reducing the volume of calculations
In this study, a new phase measurement setup to measure magnitudes and phases of the fundamental components and intermodulation created by an amplifier under two tone excitation is reported. There are three signal generators, one digital attenuator and one spectrum analyzer in the measurement setup. There is no need to any other special electronic circuits (e.g., mixer, filter, etc.). Phase is found/measured mathematically based on magnitude measurements. Also absolute phase difference between the frequency components can be measured. Measured phase error is better than 1° for repetitive measurements.
In this study, a behavioural modelling is proposed to model asymmetric IMD components produced in the two tone excitation of nonlinear amplifiers. Model parameters are extracted based on single tone and two-tone measurement results. Then measurement results and model predictions are compared for a four-tone signal.