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31.
A switched implementation of average dynamic output feedback laws trough a ∑‐Δ‐modulator, widely known in the classic communications and analog signal encoding literature, not only frees the sliding mode control approach from state measurements and the corresponding synthesis of sliding surfaces in the plant's state space, but it also allows to effectively transfer all desired closed loop features of an uniformly bounded, continuous, average output feedback controller design into the more restrictive discrete‐valued (ON‐OFF) control framework of a switched system. The proposed approach is here used for the input‐output sliding mode stabilization of the “boost” DC‐to‐DC converter. This is achieved by means of a well known passivity based controller but any other output feedback design would have served our purposes. This emphasizes the flexibility of the proposed sliding mode control design implementation through ∑‐Δ‐modulators. 相似文献
32.
Hebertt Sira‐Ramírez 《国际强度与非线性控制杂志
》2001,11(6):589-600
》2001,11(6):589-600
In this article, we provide an approximate sliding mode control‐based solution to the DC–AC power conversion problem on a ‘boost’ converter. The approach uses the flatness property of the system as a pivot for generating a sequence of minimum phase output reference trajectory candidates. The generated candidates are obtained as differential parameterizations of the minimum phase inductor current variable in terms of the non‐minimum phase desired output capacitor voltage. The associated residual dynamics of the ideal sliding motions is shown to reasonably approximate the desired biased sinusoidal output capacitor voltage signal. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
33.
The role of replications in Empirical Software Engineering 总被引:2,自引:1,他引:1
Forrest J. Shull Jeffrey C. Carver Sira Vegas Natalia Juristo 《Empirical Software Engineering》2008,13(2):211-218
Replications play a key role in Empirical Software Engineering by allowing the community to build knowledge about which results
or observations hold under which conditions. Therefore, not only can a replication that produces similar results as the original
experiment be viewed as successful, but a replication that produce results different from those of the original experiment
can also be viewed as successful. In this paper we identify two types of replications: exact replications, in which the procedures of an experiment are followed as closely as possible; and conceptual replications, in which the same research question is evaluated by using a different experimental procedure. The focus of this paper is
on exact replications. We further explore them to identify two sub-categories: dependent replications, where researchers attempt to keep all the conditions of the experiment the same or very similar and independent replications, where researchers deliberately vary one or more major aspects of the conditions of the experiment. We then discuss the role
played by each type of replication in terms of its goals, benefits, and limitations. Finally, we highlight the importance
of producing adequate documentation for an experiment (original or replication) to allow for replication. A properly documented
replication provides the details necessary to gain a sufficient understanding of the study being replicated without requiring
the replicator to slavishly follow the given procedures.
相似文献
Natalia JuristoEmail: |
34.
Sira Saisorn Jatuporn Kaew-On Somchai Wongwises 《International Journal of Heat and Mass Transfer》2010,53(19-20):4023-4038
Flow boiling heat transfer of R-134a refrigerant in a circular mini-channel, 600 mm long with a diameter of 1.75 mm, is investigated experimentally in this study. The test section is a stainless steel tube placed horizontally. Flow pattern and heat transfer coefficient data are obtained for a mass flux range of 200–1000 kg/m2 s, a heat flux range of 1–83 kW/m2 and saturation pressures of 8, 10, and 13 bar. Five different flow patterns including slug flow, throat-annular flow, churn flow, annular flow and annular-rivulet flow are observed and the heat transfer coefficient data for different flow patterns are presented. The heat transfer coefficient increases with increasing heat flux but is mostly independent of mass flux and vapour quality. In addition, it is indicated from the experiments that the higher the saturation pressure, the lower is the heat transfer coefficient. Comparisons of the present data with the existing correlations are also presented. 相似文献
35.
Santos Adrian Vegas Sira Uyaguari Fernando Dieste Oscar Turhan Burak Juristo Natalia 《Software Quality Journal》2020,28(2):371-395
Software Quality Journal - Software engineering (SE) experiments suffer from threats to validity that may impact their results. Replication allows researchers building on top of previous... 相似文献
36.
37.
This study analyzes several well-known two-phase viscosity models in order to address the appropriate correlations among them for application to micro-channel. Pressure drop data is obtained from adiabatic two-phase air–water flow experiments. A fused silica channel, 320 mm long, with an inside diameter of 0.53 mm is used as the test section. The measured data is compared with the homogeneous flow predictions calculated using the existing viscosity models and detailed comparisons are discussed. 相似文献
38.
Sira Saisorn Somchai Wongwises 《International Communications in Heat and Mass Transfer》2011,38(2):212-217
Adiabatic two-phase air-water flow is experimentally studied in this work. Two channels, made of fused silica, with different diameters of 0.53 and 0.15 mm are used as test sections. The void fraction data for both tubes are obtained by image analysis. For the larger channel, the void fraction is found to be a linear relationship with the volumetric quality. In the case of the smaller one, however, the non-linear void fraction is obtained. The measured frictional pressure drop data are compared with the predictions regarding the homogeneous flow assumption. Several well-known two-phase viscosity models are subsequently evaluated for applicability to micro-channels. 相似文献
39.
Jeerapond Leelawattanachai Kedsara Panyasu Kornkanok Prasertsom Supone Manakasettharn Hathaiphat Duangdaw Pitchaon Budthong Naranya Thepphornbanchakit Paninee Chetprayoon Kullachate Muangnapoh Sira Srinives Dujduan Waraho-Zhmayev Darapond Triampo 《International journal of cosmetic science》2023,45(5):612-626
40.
Sira Srinives Tawatchai Charinpanitkul Wiwut Tanthapanichakoon 《Journal of Industrial and Engineering Chemistry》2010,16(2):224-229
Typical rice mills generally generate tonnes of biomass which is rice husks and a significant quantity of coarse and fine dusts from the paddy, resulting in public health concern. Instead of normal air cyclones which are not efficient for collecting fine soft-hair (detached pubescence) particles smaller than a few microns, a new system using packed beds of rice husks was developed for collection fine dusts. It was found that the rice-husk packed beds could exhibit an effective performance in capturing fine dusts at various dust loadings with collection efficiency higher than 85% by mass. The filtrating phenomenon could be observed as an integrated effect of cake and deep-bed filtrations due to the heavy dust loads, agglomeration of dusts, and cohesion between the dusts and bed of irregularly shaped rice husks. Both the pressure drop across the bed and the overall filtration efficiency remarkably increased at the initial clean stage, then increased more slowly due to the recurrent fracture of the dust cake layer. 相似文献