Papers by Keyword: Parameter Variation

Abstract: Harmonic rejection ability and reflection coefficient are the most important factors in the design of impedance matching network. However, stability of impedance matching should be taken into account in applications existing load impedance variation and component deviation due to tolerance and process variation. This paper investigates variability of T network impedance matching analytically. The formulas for calculating the resulting reflection coefficient caused by parameter variations are derived from quality factor-based design method. The analysis results can provide reference for design process and an opportunity for a better understanding of the dynamic behavior of the narrowband impedance-matching networks.

Abstract: A novel adjustable magnetic field adhesion mechanism for use in wall-climbing robot is designed. The magnetic field in air gap can be switchable by rotating the center axis of adhesion mechanism so that the magnetic adhesion force is variable and it is conveniently for robot adhesion and detachment from the wall. The influence of structure parameters on adhesion performance and the optimal dimensions of mechanism are obtained by parameter variation method for best performing design. The novel optimal mechanism has been dimensioned and its magnetic force is measured. The results are compared to the simulation and it is shown that it is one of the best performing of magnet designs published for wall climbing robot adhesion mechanism.

Abstract: This research applied a stylus probe without balance and lever arm as in the previous design of a contact-force-controlled Scanning Probe Microscope (SPM) system. The controller integrated both Ziegler-Nichols-based and intelligent fuzzy methods; thus the systems relative stability can be reserved under the nominal conditions. In addition, one can see that both hysteresis and parameter variation effects of the force actuator can be reduced. Comparing the results with the traditional Ziegler-Nichols-based controller by simulation, one can see that the proposed systems are much more robust.

Abstract: Large quantity dynamic testing experiments are carried out to testing the parameter of electronic components in high over loading impact condition with a standard hammer machine and a high speed data collection system. And the experiments were performed for about 5000 times to more than 30 types of resistors, capacitors, transistors to test their main parameter in different stress level and fixing mode. The parameter of some electronic components appears more or less unstable, namely temporary failure, and it is sensitive to different stress level and impact direct in experiments, which can offer important value of references for reliability lifespan.