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20th CIRP design Conference, CIRP design 2010

作者： Schoene, C. Suesse, D. Stelzer, R. Schmidt, U. Department of Mechanical Engineering Institute of Machine Elements and Machine Design University of Technology Dresden Dresden Germany Department of Mechanical Engineering Institute of Solid State Mechanics University of Technology Dresden Dresden Germany

ISBN: (纸本)9783642159725

The paper elucidates how to connect forming process simulation with innovative measurement- and analysis equipment thereby taking into account the machine influences. Reverse engineering use 3D-Scanning data of sheet metal forming dies. Following this paradigm, the models that simulation relies on are refined, and spotting of forming dies is subjected to a scientific analysis. That means, that with Reverse engineering "extended process engineering" is verified at the real spotting procedure, the comparison of simulation- and measuring results is used to evaluate how close the investigated models are to reality, extending the optimisation algorithms used for springback compensation to die spotting, the modification of the die topology will be carried out automatically thanks to new software functions. © Springer-Verlag Berlin Heidelberg 2011.

关键词： Dies

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Individual contour adapted functional implant structures in titanium 21

Individual contour adapted functional implant structures in ...

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21st CIRP design Conference: Interdisciplinary design, CIRP 2011

作者： Schoene, C. Stelzer, R. Sembdner, P. Markwardt, J. Reitemeier, B. Engel, G. Department of Mechanical Engineering Institute of Machine Elements and Machine Design Dresden University of Technology Dresden01062 Germany Department of Oral and Maxillofacial Surgery Department of Prosthethetic Dentistry Dresden University of Technology Dresden01062 Germany Product Development Company Hofmann and Engel GmbH in Boxdorf Near Dresden

ISBN: (纸本)9788989693291

Apart from applications in mechanical engineering, now even the domain of medicine may benefit from the option of using metallic materials for Direct Manufacturing. In the medical domain, the use of biocompatible materials, such as titanium or titanium alloys is essential to produce individual implants. As a result of this development, it is now possible to generate new patient-specific geometries fitted to the contour. This paper elucidates the process chain to derive individual design variants and to produce patient-specific bone replacement implants for the lower jaw-bone regions by using innovative reverse engineering and manufacturing methods. For this interdisciplinary project, technical scientists, medical scientists at the university hospital and engineers from a product development firm work together. © Proceedings of the 21st CIRP design Conference, Korea 2011: Interdisciplinary design. All rights reserved.

关键词： Reverse engineering

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The effects of MoO3 powder lubrication on tribological properties of sliding pair exposed to high temperature

Communications - Scientific Letters of the University of Ži...

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Communications - Scientific Letters of the University of Žilina 2010年第2期12卷 67-71页

作者： Takeichi, Yoshinori Dzimko, Marian Winkelmann, Uwe Department of Mechanical Engineering Toyohashi University of Technology Toyohashi Aichi Japan Faculty of Mechanical Engineering Department of Design and Machine Elements University of Zilina Slovakia University of Applied Sciences Magdeburg-Stendal Magdeburg Germany

The effect of molybdenum trioxide MoO3 powder on the tribological properties of sliding pair exposed to the temperature up to 700 °C was examined. The experiment showed that MoO3 powder placed directly on the sliding surface of main tribological body influenced and reduced friction values of tested materials. Especially in a temperature range from 500 to 700 °C a clear minimum of friction coefficient around 600 °C was observed. The X-ray diffraction analysis of friction and wear tracks that appeared on specimens showed mixture of different elements which are the product generated during tribological processes at high temperature.

关键词： Bronze

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A new system for testing gears under variable torque and speed

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Recent Patents on Mechanical engineering 2009年第3期2卷 179-192页

作者： Mihailidis, Athanassios Nerantzis, Ioannis Laboratory of Machine Elements and Machine Design Department of Mechanical Engineering Aristotle University of Thessaloniki Thessaloniki Greece

In many applications, the transmitted power by a gearbox is fluctuating strongly. For example, in wind energy converters the rotor torque depends on the wind velocity and therefore varyies over a wide range, whereas the rotor speed is constant. In automotive applications, both torque and speed vary according to the driving conditions. It is evident, that in order to test such gearboxes, test rigs are needed that enable torque and speed to vary during the test according to the testing requirements and simulate the actual loading conditions as accurately as possible. The first part of this paper is a review of the many known mechanical devices developed to load gears. Their advantages and disadvantages are commented and presented. The second part describes a novel system designed and built by the authors (patent pending), which makes it possible to apply the test torque and speed according to a given load pattern during the test of the gears. It can further be implemented in close power loop test rigs (known also as back-to-back test rigs) such as the FZG test rig. The gearboxes of the test rig may be similar enabling thus the measurements of the power loss and efficiency of the gear pairs. It can also be used in the research of fatigue related surface failures, such as pittings and micro-pittings. The system consists mainly of a self-locking planetary Wolfrom gear train. Its sun gear is connected to a high starting torque electric motor, while its two ring gears are connected to the shafts ends of the two gearboxes. The operation of the motor is controlled by a computer. The software compares the actually applied torque, which is measured by a contactless torque meter, with the required torque, which has been already prescribed. © 2009 Bentham Science Publishers Ltd.

关键词： Torque

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Hydromechanical automatic transmission

Communications - Scientific Letters of the University of Ži...

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Communications - Scientific Letters of the University of Žilina 2009年第2期11卷 33-35页

作者： Kucera, Lubos Lulac, Michal Jurak, Ladislav Brumercik, Frantisek Department of Design and Machine Elements Faculty of Mechanical Engineering University of Zilina Slovakia

This contribution describes some tests of hydromechanical infinitely variable transmission (IVT) on a test stand. Further, there is described a truck with installed IVT and tests of this IVT at real conditions. There ... 详细信息

关键词： Variable speed transmissions

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Influence of surface structure on film formation and friction coefficient of elastohydrodynamic contacts

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Tribologie und Schmierungstechnik 2009年第4期56卷 14-20页

作者： Mihailidis, A. Bakolas, V. Drivakos, N. Decker, P. Gatsios, S. Laboratory of Machine Elements and Machine Design Greece Laboratory of Machine Elements and Machine Design Department of Mechanical Engineering Aristotle University of Thessaloniki 54124 Thessaloniki Greece Schaeffler KG 91074 Herzogenaurach Germany

Wear and surface fatigue of elastohydrodynamic contacts are strongly affected by asperity collisions. Therefore, the transition from the full to the mixed lubrication regime is of particular interest. In order to quantify this transition, the solid contact time percentage is introduced in this study. It is obtained by an experimental technique based on a two-disk test rig that enables to determine whether asperity collisions occur or not. The influence of the surface finish on the elastohydrodynamic performance is investigated using several disk pairs with the same composite roughness but different surface micro-topography. Results are evaluated using both the solid contact time percentage and the friction coefficient. It is shown that significant improvement on the tribological behaviour can be achieved by properly selecting the surface finish. In this way, the need for special surface texturing can be eliminated in many cases.

关键词： Surface roughness

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A unified fatigue life calculation model for notched components based on elastic-plastic fracture mechanics

A unified fatigue life calculation model for notched compone...

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作者： Savaidis, G. Savaidis, A. Hertel, O. Vormwald, M. Aristotle University of Thessaloniki Department of Mechanical Engineering Laboratory of U Machine Elements and Machine Design GR-54124 Thessaloniki Greece Division of Mechanics Zografou Campus National Technical University of Athens GR-15773 Athens Greece Technische Universität Darmstadt Materials Mechanics Group Petersenstr. 12 D-64287 Darmstadt Germany

Based on Dankert's et al. [1] initial model for the elastic-plastic evaluation of fatigue crack growth in sheets providing elliptical notches, a generalized procedure enabling an improved evaluation of the effective ranges of the crack driving force (i.e. the J-Integral) as well as the application to arbitrary notched components has been developed [2], The present paper presents the basic topics of the calculation model as well as its verification using experimental results from notched specimens with various notch shapes subjected to cyclic loading with various load ratios.

关键词： Crack propagation

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Prediction of losses in belt-type continuously variable transmission due to sliding between belt and disc

Prediction of losses in belt-type continuously variable tran...

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作者： Poll, G. Kruse, T. Meyer, C. Department of Machine Elements Institute for Machine Elements Engineering Design and Tribology University of Hannover Hannover Germany Department of Machine Elements Institute for Machine Elements Engineering Design and Tribology Welfengarten 1A Hannover 30167 Germany

The efficiency of belt-type continuously variable transmission (CVT) - apart from the power consumption of auxiliary systems such as hydraulics - predominantly depends on the energy dissipated during sliding at the belt-disc contacts. These sliding motions are a consequence of elastic deformations and misalignments because of clearances, resulting in a so-called spiral path of the belt elements on the discs and hence tangential and radial sliding motions. The performance of such systems can be predicted through an iterative computation by numerically solving a set of differential equations for the forces and motions coupled with a finite-element computation of the deformations. A comparison with elaborate measurements of deflections, belt motions, and losses shows that a relatively simple modified Coulomb type friction model with a steep gradient through the origin delivers sufficiently accurate results. The computations reveal the existence of 'locked' zones with extremely low 'creeping' motions. Thus, the mechanisms of power transmission in belt-type CVT are better understood and designers have a validated tool to optimize shaft and disc geometry concerning maximum efficiency. JET141© IMechE 2006.

关键词： Variable speed transmissions

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An interactive design methodology for service engineering of functional sales concepts – A potential design for environment methodology 13

An interactive design methodology for service engineering of...

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13th CIRP International Conference on Life Cycle engineering, LCE 2006

作者： Lindahl, Mattias Sundin, Erik Sakao, Tomohiko Shimomura, Yoshiki Department of Mechanical Engineering Linköping University Sweden Institute for Product Development and Machine Elements Darmstadt University of Technology Germany Department of System Design Tokyo Metropolitan University Japan

ISBN: (纸本)905682712X

Manufacturing companies around the globe are striving to increase their revenues and profitability. One way is through Functional Sales, i.e. shifting the focus from the production of products to the production of services. Functional Sales and design for Environment (DfE) have many common issues, e.g. the life cycle perspective. The paper’s aim is to highlight a proposed interactive design method for Service engineering of Functional Sales offers and to relate this method to selected DfE methods and tools as well as users’ experiences with these methods and tools. The paper concludes that the proposed method has several benefits that are useful in DfE. One benefit is that the method does not focus on products but rather on how needs can be satisfied by increasing service content. Another is the visualization of e.g. validation in order to facilitate communication between different actors in the product development process. © 2006 Katholieke Universiteit Leuven. All rights reserved.

关键词： Life cycle

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Evaluating customer requirements in Eco-VA 13

Evaluating customer requirements in Eco-VA

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13th CIRP International Conference on Life Cycle engineering, LCE 2006

作者： Sakao, Tomohiko Oberender, Christof Krone, Nils Shimomura, Yoshiki Birkhofer, Herbert Reichl, Herbert Darmstadt University of Technology Institute for Product Development and Machine Elements Germany Fraunhofer Institute for Reliability and Microintegration IZM Dept of Environmental Engineering Germany Tokyo Metropolitan University Department of System Design Japan Technical University Berlin Research Center Microperipheric Technologies Germany

ISBN: (纸本)905682712X

Products must be environmentally friendly as well as conform with the market in order to go for a sustainable society. A tool named Eco-Value Analysis (Eco-VA) has been developed by modifying the traditional Value Analysis (VA). Eco-VA allows product developers to analyze functions of a product from economic costs, customers’ importance, and environmental impacts. However, Eco-VA has the following possible improvements due to the characteristics of VA. First, it is difficult to obtain correct and accurate requirements of end users. There is a way for end users to do it in more "user-oriented" way. Second, Eco-VA does not support product developers with finding the product concept to be investigated. In order to improve in this weakness, this paper presents a new method called "Extended Eco-VA". First, the modeling method of Service engineering (SE) is adopted. A function to represent value is replaced with an Receiver’s State Parameter (RSP), by which designers represent the benefits or costs in SE. Second, Conjoint Analysis and AHP are applied to end users’ evaluation. Conjoint Analysis is carried out using design solution candidates represented with a limited small number of attributes and their levels. The presented method is verified through its application to a food processing machine. © 2006 Katholieke Universiteit Leuven. All rights reserved.

关键词： Value engineering

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