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The conventional method of frequency measurement based on traditional fast Fourier transform (FFT) can't provide to an ideal performance due to the fence effect and the leakage of frequency spectrum. As an improved algorithm of the traditional FFT, the all phase FFT (apFFT) spectrum analysis has a perfect performance on suppressing the spectrum leakage and the property of phase invariant. In this...
The reliability problem and the thermal management problem of active embedded component into organic substrate becomes a bottleneck restricting development. On the one hand, these paper overviews the thermal management features of the technology, the modeling of the thermal management and the application of thermal methods. It does the cooling and the thermal stress simulation analysis for typical...
Via design is an important factor for signal integrity. Usually there are lots of ground vias on the PCB board at high frequencies. Transmission lines need to turn or change layer, which invariably leads to impedance discontinuity and also result in the disconnection of the signal return path. To reduce the area surrounded by the signal return path and to diminish electromagnetic radiation, ground...
Aiming at the limitation of single simulation system in servo performance analysis, the key technique of multidisciplinary joint simulation system is introduced. A novel multidisciplinary joint simulation platform for servo performance analysis is established. The data exchange and integration of servo system dynamics, finite element and control analysis are realized. Finally, the application of joint...
The paper is concerned with an active suspension system for vehicles using a LQG control. The model created here is described by a linear system with four degrees of freedom, subject to random excitation from road surface. The control is determined from the view-point of ride comfort, minimizing a given perform index. The simulation results indicate that the proposed active suspension system performs...
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