Papers by Keyword: Design Method

Abstract: Amorphous carbon coatings have the potential to effectively reduce friction and wear in tribotechnical systems. The appropriate application of amorphous carbon layers requires both, a very good understanding of the tribological system and knowledge of the relationships between the fabrication of the coatings and their properties. In technical practice, however, the coatings’ development and their selection on the one hand and the design of the tribological system and its environment on the other hand are usually very strongly separated. The present work therefore aims to motivate the integrated development of tribotechnical systems with early consideration of the potential of amorphous carbon coatings. An efficient integrated development process is presented, which makes it possible to determine the boundary conditions and the load collective of the tribological system based upon an overall system and to derive the requirements for a tailored coating. In line with the nature of tribology, this approach must cover several scales. In this respect, the development process follows a V-model. The left branch of the V-model is mainly based upon a simulation chain including multibody and contact simulations. The right branch defines an experimental test chain comprising coating characterization to refine the contact simulation iteratively and tribological testing on different levels to validate the function fulfillment. Within this contribution, the outlined approach is illustrated by two use cases, namely the cam/tappet-pairing and the total knee replacement.

Abstract: The processes of cylindrical and profile milling of wood are considered, it is noted that when designing the technological operations of cylindrical milling, a large theoretical and experimental backlog created by scientists and specialists of woodworking complex enterprises is used. At the same time, profile milling of wood does not have such a knowledge base as cylindrical, it needs an effective technique for designing technology, equipment, cutting tools and automation tools for processing and control processes. It is proposed to use the accumulated knowledge and experience in the field of cylindrical milling in the development of equipment and technology for profile milling of wood, for which an analytical model of the correction coefficient for profile milling was developed and experiments were conducted to justify its adequacy. With the use of high-speed photography, we studied the removal of stocks for cylindrical and profile milling of wood, which resulted in a more significant dispersion of chips in the process of shaped milling, which is reflected in an increase in the power consumption of milling. The use of a correction factor for profile milling allows using the knowledge base created by predecessors in the field of woodworking and adapting a well-known technique to the processes of profile milling of stemwood and large sawmilling wastes.

Abstract: This study presents punching shear design method of voided slab in accordance with arrangement of voids around columns. According to previous studies, the slab-column connection of voided slabs is weaker than that of the solid slab due to the lack of cross-sectional area of concrete by voids. In this study, it is assumed that the arrangement of voids exert influence on the punching shear strength of voided slabs. To verify the assumption, finite element analysis was conducted related with previous test results. The variable of FE analysis was a distance between voids and column face. Based on FE analysis and test results including previous studies, punching shear design method is suggested which can consider the arrangement of voids around columns. The suggested design method is based on the punching shear design method in ACI-318. As a result, it can predict the punching shear strength of voided slabs according to arrangement of voids around column.

Abstract: The paper presents the results of a research that defined the weaknesses of design methodology. The end of the research project that suggests solutions for the determined weaknesses is a software that is suitable for efficient application in a very early phase of the design process, in conceptual design. It can be beneficial for mechanical engineers in the world today when we have got everything except for time and money.

Abstract: Recently, glass fiber reinforced polymer plastic (GFRP) pipes are increasing trend in using in the water-supply system because of their advantages such as light-weight, corrosion resistance, etc. GFRP pipes discussed in this paper have polymer mortar layer for core sandwiched between two tape-winding glass fiber reinforced polymer plastic layers. So, GFRP pipe properties for the design such as pipe stiffness (PS) and equivalent modulus of elasticity (Eeq) is complicated to predict or to measure. In this study, we proposed the equation that can predict the equivalent pipe stiffness factor (EI) in relation to PS and Eeq using thickness of each material layer. The predicted result obtained by the equation proposed in this paper is compared with experimental result ASTM D 2412(2010). As a result, it was in the range of-3% to +7%. So, this proposed obtained according to equation can be used to design GFRP pipe used in practice.

Abstract: A new approach for the analysis of high pressure die casting geometries concerning form filling is introduced. It enables the reduction of simulation cycles needed in the product development process, as they are highly time and cost intensive. Therefore, we developed an analysis tool, which uses shortest paths from each part of the geometry to the chosen ingate surfaces. This way, and by evaluating the information given by basic filling simulations, we can evaluate the usability of a given geometry for a high pressure die casting process and are able to suggest useful strategies to place ingates and to design a filling system.

Abstract: Startups can substantially contribute to the industrial development in the early and newly industrialized countries by transforming technological inventions into products and services. By means of the market dynamics of cooperation and competition in global value creation and knowledge networks, new products and services can conduce to a global industrial development. Hence, in pursuance of an efficient and effective startup development, this paper will present a new methodology for the integrated development of the product and of the business model for a hardware startup. Hardware startups address the development of innovative tangible products. The hardware product itself may consist of mechanical, electronical, and software components. The methodology is based on a micro cycle for the problem-solving procedure on the level of single process steps as well as on a macro cycle as procedure for the overall integrated development of the startup. For each phase of the macro cycle, specific modelling methods for the product and business model are proposed. Finally, a proof of concept on the basis of a student startup, which is developing a micro wind turbine, will be presented.

Abstract: This paper describes the design process of a high-speed cutting press with a linkage mechanism in its drive train. The whole process is carried out for a virtual prototype. The kinematic and dynamic properties of the six-bar linkage mechanism are optimised regarding boundary conditions coming from the production process and kinematic requirements. Using a rigid body model, the geometric dimensions and inertia parameters of the links of the mechanism can be determined. A finite-element (FE) model is build up to check the parts’ durability during work load. A verification of main results is realised on an experimental prototype made from rapid prototyping material.

Abstract: The individual needs of customers as well as the wide variety of environments and scenarios in which the products are used, have influences on product structure and configuration as well as in their design. These influences increase the degree of product customization especially for highly complex products with precise destination, unique or manufactured in very small series. This paper presents a case study on a cabin of an electric power generation turbine in order to identify the actions taken, tools used by the designers in the design process, co-design aspect of the product and the possibility to develop a method for customized products design.

Abstract: The on-going trend to lightweight construction leads to a special focus on plane lattice structures as an alternative for solid metal plates. They demonstrate similar mechanical properties while taking up only a fraction of the normal material input and are thus economically favourable. Additionally, they fulfil functional and design aspects and therefore are used by several industries like the automobile. Nevertheless, the two most common types of lattice structures – perforated metal plates and expended metal plates – are either waste intensive or uneven and hence require additional rolling of the metal plate.Therefore, within this contribution a new and innovative approach for the production of plane lattice structures will be presented. The manufacturing process thereby consists of two steps. At first, a specially designed pattern is cut into metal plates via a laser. Subsequently, the plates are formed under uniaxial tension to realize the lattice structures. Based on the cutting length, cutting space and the row space different blanks with tailored lattice structures can be produced. From the experimental results first guidelines for the design of suitable patterns are derived. The investigations will be performed with precipitation hardenable aluminium AA6014.