Keywords : intelligent techniques
Al-Rafidain Engineering Journal (AREJ),
2019, Volume 24, Issue 2, Pages 39-55
Intelligent techniques represent integration between building system and technology. The merge of these techniques within a building serves and eases our life. Intelligent techniques became a common concept that defines the highest levels of various standards, which determine indoor environmental health. In other words, they increase productivity, raise prosperity, as well as enhancing the efficiency of resources, cost, flexibility, and adaptability. Thus, intelligent techniques reflect the concept of sustainability, as their effects cover all the main building aspects of function, structure, and form. The study considers form as the most obvious affected aspect of a sustainable building, especially as the intelligent techniques and materials formed the building envelope.
The research is conducted on case-study samples from the region of Arab Gulf, which have a hot desert climate that is similar to the third desert climate in Iraq. The study defines the research problem as The knowledge insufficiency of the formal aspect identifications (with various classifications) that affected by intelligent techniques of sustainable buildings in the hot desert climate. The research aims to determine the aspects affected by intelligent techniques of the sustainable building in general and to verify their role and impact on the formal aspect of the façade design that can achieve the sustainability standards. Further, the samples of the case-study location in the hot desert climate aim to employ results on our local architecture in Iraq particularly.
The study defines its own structure and methodology in order to achieve its goals and solve the research problem, by dividing the research into several stages. Starting from defining the concept of the intelligence, and exploring previous studies to represent the theoretical framework. Then, listing the case-study samples, and measuring them using the descriptive analysis method, by analyzing the critical contexts upon the selected samples. The research concluded important points of the impact of the intelligent techniques on the formal aspect of the building. As the harsh conditions of the hot desert climate represent itself as a main challenge in the process, building protection against solar radiation and incandescent is vital. That is possible by methods of stirring, resistance, modulation, the control of the intelligence and the sustainability of the exterior materials.
Intelligent Systems based Selective Harmonic Elimination (SHE) for Single Phase Voltage SOURSE Inverter
Al-Rafidain Engineering Journal (AREJ),
2008, Volume 16, Issue 3, Pages 71-81
Pulse Width Modulation (PWM) inverters are of huge and great impact in many engineering disciplines. It plays a big role in the field of power electronics regarding voltage sources to vast amount of electronics equipments and machine controllers. The use of artificial intelligence in gate signals control in PWM voltage source inverter (VSI) is tackled, analyzed, and implemented in this paper. The PWM technique that investigated in this work is the Selective Harmonic Elimination (SHE). For this technique, the single phase H-bridge inverter is considered for the study. In the SHE based inverter, the fundamental voltage level and the harmonics selected for deletion are decided using a neural network ad fuzzy logics. For the SHE technique, the results of generating switching angle patterns, using the neural and the fuzzy model controllers, for driving H-bridge inverter, show almost exact resemblance, compared to those obtained using conventional controllers. Also the superiority at the intelligent models overcome the problem of delay time and have fast response in selecting and generating the PWM patterns required to regulate the inverter output voltage.
Keywords: H-bridge inverter, Pulse Width Modulation, Selective Harmonic Elimination, Intelligent Techniques.