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A new type of piezoelectric transformer which is based on the stress distribution of the piezoelectric transformer to change the output voltage is presented. In this paper, we verified the feasibility of the principle of the new piezoelectric transformer from the simulation and experiment. The experiment results show a good consistent with the theoretical analysis. The designed piezoelectric transformer...
This paper describes the research and implementation of parameters system for small or medium-sized four-column hydraulic press design, which the whole process is valuable and practical. Firstly, the status quo of hydraulic design is analyzed. Secondly, based on the analysis of the design process about the upper beam in four-column hydraulic, the design process of various components are illustrated...
Irregularity of the fixed frog affects the passage velocity and the comfort of urban railway vehicles. To reveal this irregularity, based on the Finite Element Method (FEM) computational models were set up. The models included the contact between the worn tread wheel of Dalian tram and the 50kg/m rail as well as the different sections of No. 9 fixed frog. The results were used to find the laws of...
A virtual prototype of a certain caterpillar drive system is established based on virtual prototype technology in the article, the dynamic load spectrums in operation on different work sections of drive system gears are obtained through a simulation riding test. Applying finite element technology on three-dimensional contact stress dynamic analysis, the course of contact stress in flank of tooth area...
To study the effects of temperature dependent nonlinear material properties on wheel-rail thermo-elastic contact, and compare behavior of different wheel profiles, four types of wheel profiles, XP55, S1002, LM, and LMA, wheel-rail slide models were built using finite element method (FEM) software MSC.Marc. Slide temperature and thermal stress were analyzed in thermal-contact coupled and pure mechanical...
Rock slope is an unknown and complicated system; As for time series with strong randomization, application of the modified GM(1,1) was much more precise than ordinary GMs by comparison. And for time series with fluctuate positive and negative data, translation of the data and revivification after modeling was introduced to make an expansion of the application of the modified GM(1,1). The fitting and...
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