Experimentation Research Modeling and Analysis

Experimentation Research

Modeling and Analysis of Submerged Arc Weld Power Supply Based on Double Closed-Loop Control commences with the article's abstract, which briefly summarizes the core elements of the piece. It states that two methods were developed:

The small signal mathematic model of main circuit of soft-switching SAW inverter

The mathematic model of double closed-loop phase-shift control system circuit

Each of the two models was constructed with the use of specific modeling methods and they were then used to test the dynamic performance of the inverter. Research and experimentation constituted the basis of the posed question and the conclusions indicated a direct relationship between the structure of the power source circuit and the dynamic performance. In the words of Baoshan Shi, Kuanfang He, Xuejun Li and Dongmin Xiao (2010), "Research and experimentation show that relation between structure of the power source circuit and dynamic performance of the controlling system can be announced by the established mathematic model, which provides development of power supply and optimized design of controlling parameter with theoretical guidance."

The first and foremost important limitation of the study is constituted by the failure of stating the study assumptions. Similar to any other type of research endeavor, the current one commences at several premises and assumptions, but does not state them clearly. The four authors do nevertheless state the principles which sit at the basis of the research and experimental endeavor. In this order of ideas, these principles are as follows:

The given sketch map of the double-loop feedback control system

The use of hall sensor to sample current signal from primary transformer

High speed rectifying

The need for a reasonable slope compensation circuit

The sampling of the peak current signal and the synchronization with the signal of inverter cycle

Detection of output current of inductance and its comparison to get error signal, leading to the final control of the output current.

The four authors have selected complex mathematical models to experiment and the combination of these models testifies for the high validity and relevance of the study findings. The validity and reliability are also accounted for by the high credentials and expertise of the authors. The sampling strategy was also complex and it once again increases the importance of the study, as does the usage of the selected variables -- output voltage and time when load instantaneous change.

The analysis of the article reveals the lack of hypothesis. Generically, most research endeavors commence at a given premises and then test the hypothesis in order to establish its validity. In the case of Baoshan Shi, Kuanfang He, Xuejun Li and Dongmin Xiao however, the approach was a different one. Specifically, the four editors commenced their endeavor at the premises of the already existent circuits and they experimented with them in order to create new findings, rather than test already existent hypotheses.

Their endeavor adds more value to the fields of mathematics and engineering as it has a dual significance. On the one hand, the study is valuable from a theoretical standpoint as it deals with theoretical aspects and finds a theoretical conclusion. The authors finally find that "double closed-loop control can improve dynamic characteristics of arc welding power source, which can meet request of SAW technology."

The finding virtually means that those interested in modeling and analysis of arc weld power supply can seek the article and expand their knowledge on the subject. As a parenthesis, most research endeavors also have the academic advantage of being based on through research of the available literature. This research is integrated in a Literature review section which restates the most important findings in the specialized literature, in a centralized manner and through the lenses of relevance to the study at hand. The absence of a literature review section constitutes a handicap for the article and its readers. In a context in which the readers are not familiarized with the available literature, they will be unable to comprehend the meaning and importance of the works of Baoshan Shi, Kuanfang He, Xuejun Li and Dongmin Xiao. Additionally, the highly technical language used once again restricts the access readers might desire in the article. In other words, the piece is only accessible to those highly specialized in the field.

On the other hand, there is the practical significance of the study, which could support the development of the industry. Specifically, when engineers comprehend and apply the lessons promoted by Baoshan Shi, Kuanfang He, Xuejun Li and Dongmin Xiao, they would be able to improve the performances of the arc weld power supply, to as such support the development of human communities.