Applied Mechanics and Materials Vols. 215-216

Abstract: A new algorithm based on orthogonal arrays is developed to determine the optimal solution among the optional settings using the design of experiment approach for newly designed devices. The proposed algorithm begins with several successive orthogonal arrays and ends with a full factorial array. In the proposed algorithm, we suggest a mandatory verification of two additional settings at each orthogonal array to avoid errors in identifying the best level of the dominant factor, which often occur when a non-separable problem is solved. We initially verify the proposed algorithm by applying it to a well-known benchmark problem, the Rosenbrock function. The proposed procedure is described in detail in this paper. To distinguish the superior performance of the proposed algorithm relative to that of other design of experiment approaches, we study three types of problems with non-interactive or interactive variables. Finally, we applied the algorithm on the optimization design of an M-type spring used in a slider cell-phone. With minimizing the maximum stress as the objective function of the designing product, the results show that the proposed method not only provides a final solution that is identical to the problem’s exact solution but also requires much less computation time than a full factorial method.

Abstract: Throughout the product lifecycle stages of aircraft development, in order to meet the aircraft product data unique, complete, dynamic, and non-redundant in Product Data Management (PDM) system, and adapt to the effective management of product data in the aircraft development process, the early realization of the aircraft development process co-design. On the basis of the International Workflow Management Coalition (of WFMC) about workflow definition, this paper presents a workflow-based aircraft product data retrospectively theory.

Abstract: To solve the problems of the traditional approach to uniform granular module clustering, a new method for module clustering based on uneven granularity and intelligent optimization oriented to the customizable product design was proposed. Considering the impacts of requirements, functions and structures, the integrated fuzzy similarity matrix of parts was built using the correlativity analysis, and then the hierarchical structure was generated through a fuzzy clustering algorithm. All the universes of the granular layers in the hierarchical structure were gathered and the uneven granular module clustering scheme was formally presented. Four quantified indices including customizability index, customer satisfaction degree, design complexity and assembly complexity, were proposed to set up four optimization objective functions. Use nondominated sorting genetic algorithm II to solve the problem in order to obtain the Pareto optimal set. A design case of the single mast storage/retrieval machine was studied to demonstrate the feasibility of the proposed method.

Abstract: In view of the study of topology optimization design method on vibration and noise reduction of damping sandwich circular saw, the optimal thickness and layout of damping material were obtained. The optimization model of circular saw was established by using the coupling method, the optimum thickness of damping layer was found. By using ESO method, deleting elements method and modal loss factor sensitivity calculation method were obtained. Making use of modal loss factor sensitivity, ineffective elements were deleted by judging the whole structure damping effect on each damping material element, optimal configuration of damping sandwich circular saw structure under the stiffness condition was obtained, which reduced the vibration and noise and reached a certain stiffness requirements. By contrasting the damping loss factor of three different circular saw models, the results show that optimized circular saw structure has the best damping effect.

Abstract: Coupling between the vibration frequencies and the unsteady aerodynamic will reduce the flutter speed and ride quality through the aerodynamic heat transfer. As the flight speed improved, the aeroelastic analysis has become an essential means of aircraft design. The method of aero-thermo-elastic (ATE) analysis is coupled with aircraft aeroelastic analysis and thermal deformation, and is more realistic reflection of the actual flight of the aircraft. In this paper, an ATE analysis of aircraft adopted by computational fluid dynamics/computational structural dynamics (CFD/CSD) methods, and compared with the traditional analysis, to provide analytical tools for the supersonic aircraft design.

Abstract: Innovation is the only approach to obtain competitive products. Companies will maintain their invincible position in the fast-changing market by accelerating products innovation speed and improving quick-response ability. The research focuses on the design of innovative sprayer based on ergonomics and rapid prototyping. In terms of the size, shape and colour of sprayer design, it was taken into account from anatomy, physiology and psychology of human characteristics. Thus the operators can work healthily, comfortable and effectively. In the every stages of design, various prototypes provided by rapid prototyping were used to evaluate, test and modify of 3D models, along with test on function and assembly. Then time of design can be shortened significantly, the speed of sprayer innovative design can be increased, the development costs and investment risk can be decreased, and the enterprise competitiveness can be promoted.

Abstract: The authors designed an efficient and reliable Jatropha-nut huller. And the orthogonal experiments of 3 factors and 3 levels had been accomplished with hulling rate and the smashed nut rate as the test measurement indexes, which related to the initial moisture content rate of the Jatropha-nut, the speed of the squeeze-wheel and the interstice between the squeeze-wheel and crusher plate. The result shows that, moisture content rate and extrusion interstice affected obviously the comprehensive evaluation value at 1% levels of significance, and roller speed affected obviously the comprehensive evaluation value at 5% levels of significance, the order of impact factors were as follows: extrusion interstice, Jatropha-nut moisture content rate, the roller speed. The best level is: the Jatropha-nut initial fruit moisture content is 20%, speed roller 300r.min^-1, extrusion interstice 5mm. After the parameters optimized, hulling rate is more than 85%, and the smashed nut rate is less than 10%.

Abstract: To date the majority of research into engineering design expertise has been done within an occidental context. With an increase in multinational design firms engineers are now more likely to work with engineers of different backgrounds. The authors’ experience in countries other than their own suggested that background can affect design engineers’ thinking and working, and the nature of expertise. This prompted a study (via interviews) into design teams with mixed (by nationality) members. This investigation into occidental and Sino backgrounds and engineering design expertise showed that a Sino background encouraged low risk reliable designs and detailed thinking while an occidental background promoted unique ideas, systemic thinking and the use of objective knowledge. However, individual change and improvement is possible.

Abstract: To achieve sustainable development of human society, it can not only rely on eco-design. We need more comprehensive design that integrate economic/social issues, especially design of the product service system (PSS). A value gap model of PSS development & design is put forward by using service quality model in marketing science. Based on the value gap model, the principle and process of PSS development & design are proposed, which require the consideration of supply and demand with bio-directional perspective. Focusing on the analysis of value gap, the new stereotypical model of PSS development & design is built, including the state parameter and the value conflicts of all stakeholders. Thus, the process of PSS development & design could be quantitatively and rationally evaluated.

Abstract: The explanded Lever method was used to designe and analyze the 8-speed AT .The studying results proved the correctness of the explanded Lever method, and a transmission scheme of 8-speed AT was designed and researched through it.