Wanchai Rattanawong

A generic algorithm for a best part orientation system for complex parts in rapid prototyping

Abstract This paper presents a generic mathematical algorithm to determine the best part orientation for building a part in a layer-by-layer rapid prototyping (RP) system. The algorithm works on the principle of computing the volumetric error (VE) in a part at different orientations and then determining the best orientation based on the minimum VE in the part. The algorithm is shown to work for a part of any shape and complexity, with any slice thickness, and for the orientation of a part about any selected axis. The part orientation system based on this algorithm graphically displays the VE at different part orientations and recommends the best part orientation. The system will help RP users in creating RP parts with a higher level of accuracy and surface finish.

A volumetric approach to part-build orientations in rapid prototyping

Abstract This paper presents the development of a part-build orientation system for rapid prototyping by considering the volumetric error (VE) encountered in parts during the building process. The methodology involves a primitive volume approach, which assumes a complex part to be constructed from a combination of basic primitive volumes. First, the VE in a number of primitive volumes such as cylinders, cubes, hemispheres, cones and pyramids is considered. Then, the VE in parts made from a combination of these primitives is determined. The system graphically displays the VE at different orientation of any part and recommends the best orientation for the minimum VE in the whole part. This paper will illustrate the methodology by considering the case of the orientation problem of a cone and the parts made from different primitives.

Intelligent System for Transportation Mode Selection in ASEAN Countries

Abstract: Association of Southeast Asian Nations: ASEAN is an organization of ten countries in Southeast Asia consisting of Indonesia, Malaysia, the Philippines, Singapore, Brunei, Myanmar, Cambodia, Laos, Vietnam and Thailand. One of the major purposes of Asean is to create the Asean Economic Community: AEC as an economic organization. The mission of the AEC is to develop a single market and develop production base to be stable prosperous, highly competitive and economically, integrated with effective facilitation for trade and investment including a free flow of goods, services, investment, skilled labors and capital . This paper focuses on investigating the constraint within the three major modes of transportation (Air Sea and Truck) and reviewing the major factor influenced mode selection of the trading organization in Asean countries. Whilst constraints and complexities exist particularly within different countries, products values, lead time, a lack of knowledge on the condition of each transportation mode of the Small and Medium Enterprise (SME). At the time for those requirements can result in business limitation and restrictions. The results of research will lead to the design of an intelligent transportation system program that will not only illustrate solution for the trading organization in Asean countries but also provide variable costing and accurate transit time as management tools for users.

Efficiency Improvement for Multi Depot Vehicle Routing: A Case Study in Cash Distribution

This research is aimed at increasing efficiency of cash distribution from three distribution centers delivered to 377 branches, and 3,699 automatic teller machines by using Cluster First – Route Second technique. New concept of assignment problem with time window is presented in this paper for clustering. A Group Sweep Algorithm which is modified from a traditional Sweep Algorithm combined with a nearest neighbor search is also presented as the routing methodology. Application software has developed using PHP and MySQL. AMPL with CPLEX 10.0 is used to solve the assignment problem and is perfectly embraced underneath the developed application software to allow the user friendly experience. The software allow the flexibility in changing various parameters such as, capacity proportion of each cash distribution center, speed of vehicle, service time at each branch or ATM, time window of each branch or ATM or distribution center, etc. The result shows that 11 vehicle can be reduced resulting in cost reduction in a total amount of US

Part Build Orientations Based on Volumetric Error in Fused Deposition Modelling

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