Papers by Keyword: Manufacturing Technology

Abstract: The work is devoted to the analysis of the effect of holes made using various technologies on the strength of orthogonally reinforced fibrous composites. Comparison of data obtained by finite-element modeling with results of tensile experiments of composite plates with holes is given. It has been experimentally confirmed that drilling holes in fibrous composites is unacceptable: when making holes, fibers must be expanded at the stage of molding the composite element. It has also been shown that it is possible to model, if not the fiber structure itself, but the properties of the material next to the hole using the built-in functions of FEA programs.

Abstract: The article presents thermoplastic characteristics of polymer composite materials developed on domestic raw materials on a thermoplastic matrix-injection material of the VTP-7 brand based on polyaryl sulfones (polysulfone PSU) plastic and sheet material of the VKU-44 brand based on PSU and carbon unidirectional tape ELUR 0.08 PA. In the article, the author considered the modification method of thermoplastic polymers to impart functional properties and mechanisms of their action. It is shown that the developed materials have no analogues in the domestic industry. According to the level of physical and mechanical characteristics, fire-hazard properties and heat resistance, the developed polymer composite materials (PCM) fully meets the requirements for modern thermoplastic PCM, and is not inferior to foreign analogues.

Abstract: The article presented the use of composite polymeric materials to increase the effectiveness of ship ventilation systems in the process of its machining. As the result of the research, the author considered that, it is important to evaluate and anticipate all possible factors (technical, technological, ergonomic, environmental) associated with the negative impact of excessive production waste generation (chips and dust) in the workplace at the design stages of technological processes for machining parts made of composite materials. The research results determined the possibility of using composite polymer materials for manufacturing the structures of ship ventilation systems, as well as other ship systems.

Abstract: The article discusses the use of polymer composite materials in the manufacture of ship ventilation pipelines. In this article, the author gives the features of manufacturing technology of ship pipeline production with different designs from composite materials.

Abstract: This work presents a novel teaching experience in the framework of final master and bachelor theses within the research line on incremental sheet forming processes. This forming process involves a series of competences dealing with manufacturing technology at a wide multidisciplinary level. This paper analyses these different manufacturing topics and the knowledge acquired by students doing their final theses within this field. This knowledge will be very useful during their future professional career.

Abstract: Incineration is a Thermal Treatment Technology (3Ts) that could be expressed as the way to get rid of waste effectively with the reduction of its mass and volume. However, to control the combustion process efficiently, especially combustion temperature, with low energy content in Municipal Solid Waste (MSW), an additional fuel is needed and leads to increase of operating cost compared with other disposal option. High Temperature Air Combustion (HTAC) has been successfully demonstrated in a lab-scale incinerator for energy saving and pollutant reduction, especially NO_x. This article has the objective to design and manufacture the prototype scale High Temperature Air Incinerator with a capacity to treat MSW of 12 Ton per day. The system consists of an automatic feeding machine to feed the waste into the primary combustion chamber (PCC) where the combustion takes place. The push ram is used to push the burning waste and fall down to the lower hearth. Primary combustion air is supplied into PCC at the amount lower than the stoichiometric requirement to produce the combustible gas which is flown into the Secondary Combustion Chamber (SCC) located above PCC. Secondary combustion air is injected to react with combustible gas to convert to the product of complete combustion. A part of hot flue gas which is flew out from SCC is reverted and mixed with fresh air, in order to reduce oxygen concentration, before passing through the heat exchanger tube bundle which is placed inside SCC in order to exchange heat with hot flue gas. To manufacture the designed incinerator, the detail of materials used as well as the frabication method is explained. It has been shown that HTAC can be applied for thermal destruction of waste successfully, in term of energy saving and pollutant free. Benefits of this research work will promote the using of thermal treatment technology of dispose of MSW with lower operating cost and lower pollutants.

Abstract: This paper briefly summarizes the new materials and their current status; discusses the characters and key points of application; at the same time, this paper conducts a further analysis on the style, external outline, internal details, function of texture, practicability and color application; and summarizes the influencing factors during the process of sweat production and contexture based on the characters of raw materials to provide with certain theoretical reference for related designers

Abstract: A new technique to prepare macroporous hydroxyapatite (HA) scaffolds was introduced. Porous HA ceramics were prepared by sol-gel method from chitin dissolved in dimethylacetylamide (DMAc) / lithium chloride (LiCl) solvent, three dimensional stacking with HA gel fibers and pore agent. The blocks dried were heated to optimum sintering temperature of 1280°C. The porous HA ceramics reinforced by homogeneous fibers, with interconnected pores and high porosity and pore-diameter were obtained, whilst improving mechanical strength. Sintered ceramics were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analysis confirmed that the crystal structure remained HA. SEM showed the samples presented a highly interconnected porous reticulate structure with average pore size ranging from 340μm to 450μm. The porosity was varied from 61% to 83%. The maximum compressive strength of HA ceramic was 3.4MPa.The mechanical strength of samples was improved with addition of homogeneous fibers.

Abstract: The purpose of this study is to study the impact of manufacturing technology in facilitating lean manufacturers in achieving superior manufacturing performance while operating with by various challenges from external environment. The paper is based on a survey research done on lean manufacturers in Malaysia and their adoption of manufacturing technology to couple the implemented lean system in mitigating challenges. The challenges faced by lean manufacturing firms in many developing countries includes adopting the right technology, using it efficiently and continuously reviewing production technology in order to gain maximum output. Model from this empirical study is expected to contribute towards the enhancement of theory on contingency and its effect on performance. At theoretical level, the study results showed that of manufacturing technology mediate the relationship between environmental factors and performance of lean manufacturers.

Abstract: Based on the linguistic Adaptation Theory of Jeff Verschueren, the Adaptation Principle explains the reasons of CS occurrence in terms of linguistic reality, social conventions, and psychological motivations. The present thesis applies the Adaptation Model based on manufacturing technology to the Chinese English CS of Chinese natives in online discourse. Based on the corpus of Chinese English CS in online discourse, the present thesis analyzes the CSs different forms, unique features and motivations of communications.