Applied Mechanics and Materials Vol. 404

Abstract: Assembly sequence planning is one of the key technologies for virtual assembly. It mainly consists of three parts, i.e. assembly modeling, planning algorithm and evaluation of sequence planning. This paper presents an overview about the research status quo and methods of the above three parts, analyzes both the advantages and disadvantages of those research methods and their application scope and proposes the trends of their development.

Abstract: Rapid Prototyping (RP) can be defined as a group of techniques used to quickly fabricate a scale model of a part or assembly using three-dimensional Computer Aided Design (CAD) data. What is commonly considered to be the first Rapid Prototyping technique, Stereolithography was developed by 3D Systems of Valencia, CA, USA. The company was founded in 1986, and since then, a number of different Rapid Prototyping techniques have become available. In paper are presented possibilities of Rapid Prototyping application in area of intelligent optimization design.

Abstract: According to Assemble line balancing (ALB) problem which is widespread in manufacture, we establish a mathematical model and present our improved algorithm that is based on Heuristic rules, which adopt cumulative ranked positional weight as a basis of task assignments and schedule the orders of branches traversal. After that we can find an optimal solution to the balancing problem efficiently. The result of examples given by this paper shows our algorithm has a good performance.

Abstract: Special software for tire vulcanization simulation was developed using ABAQUS software as the core solver and Visual Basic6.0 as the develop language. The software was based on principles of easy operation, professional and intelligent analysis. In this way, automation and professionalization of the analysis process were performed. The special software mainly consists of three functions: Firstly, model grid was automatically recognized, and corresponding configuration files were automatically built, which were required in the analysis preprocess. Secondly, ABAQUS solver was invoked to solve the model. Finally, results such as state-of-cure, temperature and other curing performances were automatically extracted and saved as excel or word format. Besides, the curing profiles could be proposed. The results showed that this software is easy to use and work efficiently.

Abstract: To solve the just-in-time materials delivery problem in discrete production system, a three-phase heuristics algorithm is proposed to determine an appropriate materials delivery cycle-time with the constraint of delivery capacity. In which the first phase is to determine the quantity of the materials and the vehicle numbers, the second phase is to solve the travelling time of each vehicle number, and the third phase is to assign each vehicle number to specific vehicles to determine the travelling time of each vehicle. The performance of this three-phase heuristic algorithm is tested and verified by using an example experiment, and the computational results show that the average deviation just increased 0.513% compared with the well-know genetic algorithm and it is much easier to comply. It verifies the effectiveness of this heuristic algorithm in solving the just-in-time materials delivery problem in discrete production system.

Abstract: Aiming at the existing problem of plane tube welding jig manufacturing, many systems developed such as standard components parameterized modeling system, computer intelligent reasoning system, standard components replacement system, accuracy checking system and standard components management system, and also replace the traditional standard samples by three-dimensional model of tube, then realize the digital rapid design and manufacture of combined welding jig.

Abstract: With the Model Based Definition technology applied in the aviation manufacturing industry, the 3D model becomes the only basis to design and manufacture. The 3D manufacturing process design becomes the link between three-dimensional design and three-dimensional manufacturing. Here, the relations are analyzed between the traditional manufacturing model and three-dimensional manufacturing model, and the key technology and method of 3D manufacturing process design are made clear. Furthermore, three-dimensional process system architecture is proposed combining the enterprise application integration and data management requirements. Finally, a practice result of enterprise information project mentioned as an example, which would be the foundation to establish the complete three-dimensional development system.

Abstract: BT mode (Build Transfer) is a kind of financing mode, refers to government departments use non-financial fund for basic facilities construction project. In recent years, more and more project in Domestic construction market use BT mode, and BT mode also use in Construction of urban infrastructure projects. So BT mode has a broad application prospect of urban rail transit projects in the future. Based on the analysis of the common operation forms of BT mode, this paper analyzes the common risks in BT mode in operation, and discusses the principle of risk-sharing with utility theory.

Abstract: The rubber industry is an important sector in the national economy. The article took the natural rubber and synthetic rubber as the main studying objects to analyze and forecast the amount of supply and demand of Chinas rubber raw materials. Analyzed the status of supply and demand of Chinas rubber raw materials from 2006 to 2011, and established the Grey Forecasting Model to forecast the supply and demand from 2012 to 2017 in China, and concluded that the prosperous supply and demand of rubber raw materials would be continued in the future.

Abstract: Automobile is a typical multi-stage split charging and assembly manufactured product. It can be divided into engine, body, chassis and electrical four modules functionally. Auto parts proportion is defined as the ratio of purchasing costs of a given part to the total costs. In this paper, an auto parts proportion model is proposed by means of matrix and statistical analysis, a benchmarking proportion calculating model of various vehicle types is presented by means of average and mode comparison. On the basis of these models, target costs of auto-parts, systems and modules can be calculated. These models and methodologies have been used in the processes of new product development costs controlling and developed products costs reduction in a big scale automobile company.