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The purpose of this research is to study and investigate the flow control of 0.8 Mach jet using three tab configurations. The tabs with the slots will eventually lead to generation of vortices and thus enhances the mixing characteristics.

The jet flow control is achieved by the usage of three tabs, namely, Tab A, Tab B and Tab C that are placed at the exit plane of the convergent nozzle at 180 degrees apart. Three tabs with different slot profile are designed with the same constant blockage ratio of 7.3%. The tabs produce vortices of varying sizes that directly influence and modify the jet structure, thereby enhancing the efficiency in mass entrainment and mixing. The tabs are studied numerically first and then are compared with the results of the experiments.

The results are compared with that of the results of the uncontrolled jet. For Mach 0.8 jet, Tab C is found to reduce the core length and gives reduction of 90.23%, in comparison to Tab A and Tab B, which provides 84.1% and 87.79%, respectively. The results of numerical are then compared with the centerline results obtained via experiments. With the engagement of Tabs A, B and C, the jet structure is seen to have been modified at Mach 0.8 with Tab C performing better.

The tabs are a passive control device that can be practically enabled in the aircraft nozzles to control the flow and even suppress the noise emanated by the jet. Tabs can be effectively used for better thrust vector control and assist in jet noise suppression. Thus, this study on tabs and its uses are important and essential in aerospace technology.

This particular study on mechanical slotted tabs is innovatively carried out by designing the tabs in such a way that one such has not been designed before. The slots run through the adjacent sides of the tabs which is a novelty in itself, whereas perforations made only through the opposite sides of the tabs are studied by various researchers till now. The slots in the adjacent faces modify the flow physics in such a way that it enhances mixing by the creation of turbulence because of the interaction between the main stream and the secondary jet exactly at the core. So far, such slots and profiles are not investigated. By the usage of such tabs, the flow to mix faster is much closer to the core of the jet by creating mixed size vortices and thus has higher efficiency.

This paper presents a versatile and economical knowledge‐based assembly design of blade and shell assemblies by employing behavioral modeling concepts. Behavioral modeling is a new generation CAD concept aimed at achieving ultimately optimum results with the efforts made in the early stage of the product development cycle. As a result, the assembly process of any odd‐configured parts such as torque converter blades, can be accurately planned, and made adaptable to all potential in‐process alterations due to either changes of components design or that of the assembly kinematics. Optimum assembly design is achieved when the volumetric interference meets a desired value based on an expert's determination. Experimental verification of the proposed optimum assembly design conducted in Luk, Inc. with two different blades' assemblies demonstrates satisfactory results.

The purpose of this paper is to implement the generative design as an optimization technique to achieve a reasonable trade-off between weight and reliability for the control arm plate of a double-wishbone suspension assembly of a Formula Student race car.

The generative design methodology is applied to develop a low-weight design alternative to a standard control arm plate design. A static stress simulation and a fatigue life study are developed to assess the response of the plate against the loading criteria and to ensure that the plate sustains the theoretically determined number of loading cycles.

The approach implemented provides a justifiable outcome for a weight-factor of safety trade-off. In addition to optimal material distribution, the generative design methodology provides several design outcomes, for different materials and fabrication techniques. This enables the selection of the best possible outcome for several structural requirements.

This technique can be used for applications with pre-defined constraints, such as packaging and loading, usually observed in load-bearing components developed in the automotive and aerospace sectors of the manufacturing industry.

Using this technique can provide an alternative design solution to long periods spent in the design phase, because of its ability to generate several possible outcomes in just a fraction of time.

The proposed research provides a means of developing optimized designs and provides techniques in which the design developed and chosen can be structurally analyzed.

Valuable concepts for flexible sheet metal assembly have come out of a student project which is now in its fourth year at the Cranfield Institute of Technology.

THE conventional appearance of the A300B belies its aerodynamic refinement. Early research work initiated by Hawker Siddeley Aviation has been extended by wind tunnel testing in France, the United Kingdom, Germany and Holland.

By leveraging various designs for assembly and designs for manufacturing methods, manufacturing industry can apply solid modeling, or 3D design, to increase profit margins and decrease the time to market of its product. Specific to torque converter development, an engineer can utilize a CAD package and gain all of the advantages of designing in 3D without the drawback of increased design time. In this paper we propose a behavioral modeling technique to capture design intent and utilize the intent maps for obtaining 3D solid models in a similar amount of time as on a 2D CAD system, but with the advantage of a life‐like final design. This results in fewer modifications and less inaccuracies associated with 2D design. A 3D model so generated also assists in drawing interpretation. In general, using the proposed techniques will streamline the torque converter design cycle and move readily towards desired assembly automation. Torque converter design for assembly is implemented as an illustrated example.

THE conventional appearance of the A‐300B European Airbus belies its advanced design. The volume of traffic to be handled by this type of aircraft requires advances in aerodynamic, structural and mechanical efficiency. This means that the design should be backed by detailed research.

In a combustion system for burning fluid fuel in a gaseous stream of combustion‐supporting medium, ducting immersed in the said stream and comprising first and second duct portions both extending gcnsrally in the direction of flow of said stream and enclosing between them an annular passage open at both ends, an annular ring portion extending radially from the downstream end of said second duct portion and away from said first duct portion so as to form a sudden enlargement of said annular passage, an annular fuel supply chamber comprising a wall of porous material adjoining that edge of said annular ring which is the more remote from said first duct portion and extending downstream from said edge, a third duct portion extending downstream from said annular fuel supply chamber, and a flame deflector spaced downstream from said fuel supply chamber and extending part way across said passage.

Rhoden Partners has won a design award for the automated assembly machine for linear bearing cages which it designed and manufactured for Firsteel Metal Products. Anna Kochan reports.

The Colon Classification of Dr. Ranganathan differs in several fundamental ways from other schemes of classification and challenges a number of accepted ideas about the nature of classification schedules. The new developments, however, are fundamentally extensions of ideas already existing in incipient forms in the other schemes. Its various ‘devices’—so called by the author—are generally speaking no more than a rationalization of existing methods of synthetic number building common to the major schemes. The two principles which mark out the Colon Classification most distinctly from all others are the principle of facet analysis and the principle of mnemonics. I shall have to content myself here with an attempt to explain the principle of facet analysis.