In this paper, multi-physical models of bending characteristics, including the static, dynamic and microwave models, are firstly proposed for the double-clamped beam switch based on flexible substrate. Both simulated and experimental verification have been carried out to prove that the changing regularity of the driving voltage and time of the switch is inversely proportional with the increase in the bending curvature of the flexible substrate. The microwave performance of the switch at the ON state is found to get worse with the increase in the bending curvature. The measured results indicate that when the bending curvature increases from 0 m−1 to 28.6 m−1, the measured driving voltage decreases from 90.0 V to 72.6 V with the error of 5.9% compared with the calculated results. The measured driving time decreases from 52.4 μs to 35.6 μs with the error of 16.7% compared with the calculated results. When the substrate bending curvature increases from 0 m−1 to 28.6 m−1, the measured reflection loss S11 of the switch gradually deteriorates from −27.1 dB to −22.0 dB with the error of 1.3 dB corresponding to the calculated results at 10 GHz. All the simulated and experimental results are consistent with the theoretical calculated results.
It is critical to measure the static and dynamic deformation of the micro beam over their
full range of voltage and frequency inputs, which are key parameters for predicting device behavior.
In this study, full-field technique by correlation of projected fringe patterns is selected to determine
static deformation, while dynamic parameters can be obtained by DIC with high-speed CMOS
camera, whose maximal frame rate is 32k f/s. The static tests of micro beams are carried out by
applying electric field forces under different dc voltage, while the dynamic tests are excited by
harmonic excitations. Using the DIC method, the whole field in-plane or out-of-plane displacements
of the micro beams are obtained, and hence the dynamic characteristics by post-processing of
vibration analysis. Experimental results including the bending deformation and vibration parameters
are reported and compared with finite element method. This study verifies the feasibility of this
technique to measure both static and dynamic characteristics of MEMS components.
In this paper, we study the physical basis of the crossing-point temperature (CPT) techniques and seek guidelines for attaining reliable evaluation on the kinetic parameters of the exothermic reactions that occurred during the self-heating of solids. By numerically simulating the thermal response of a solid sample placed in a convective thermal environment, the variation in the trend of the enthalpy change term together with the heat generation term in the sample central elementary volume was monitored, which allowed a close observation on the formation of a CPT. It was found that a true CPT is the transition temperature at which the heat transfer from the surroundings to the central neighborhood goes into reverse. The CPT values measured during practical testing may be altered by experimental settings for finding equal temperatures between the sample centre and a reference point, which is more evident at the conditions of enlarged sample sizes and elevated oven temperatures. Relaxation on the criterion of the equality between the enthalpy change term and the heat generation term in the central elementary volume yielded a theoretical correlation for determining the maximum distance for the reference temperature sensor to be placed in order to perform reliable measurement of a CPT. This correlation is in excellent agreement with the experimental settings for the reference point adopted by various research groups.KEYWORDS: solid, self heating, spontaneous ignition, crossing-point temperature.
NOMENCLATURE LISTING
The problem of vibration of the buildings and transformers in the urban substation has becoming more and more socially concerned. The urban substation and its associated building are taken as the research object. the vibration tests and modal shapes of the building and each floor slab were carried out. The transformer vibration and its noise were transmitted with obvious attenuation in the structural floor slab. The vibration transmission into the lower floor slab was higher than that of into the higher one. The further away from the transformer room, the vibration characteristics are weak, and the attenuation is no longer significant. At last, the finite element model was established for the urban substation. The transformer and floor slab vibration went through the simulated analysis and the consistent analysis results were obtained.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.