Special Session: Optimization of Mechanical Systems
Asst. Prof. Erdem Acar
In recent years, the application of optimization methods in design of mechanical systems has been widely recognized. It has been shown that lighter, safer and cheaper designs can be obtained through optimization. This special session aims to provide a forum for researchers from academia and industry to exchange information, experience and ideas as well as to build future collaborations. Emerging and state of the art topics in optimization as well as optimization applications in all types of mechanical systems will be discussed. Topics to be covered include (but are not limited to):
- Optimization applications in automobile design, aircraft design, manufacturing, etc...
- Numerical Optimization Techniques
- Experimental Optimization Techniques
- Shape and Topology Optimization
- Structural Optimization
- Surrogate-based Optimization
- Multidisciplinary Optimization
- Multi-objective Optimization
- Robust and Reliability-based Design Optimization
Asst. Prof. Erdem Acar
Department of Mechanical Engineering
TOBB University of Economy and Technology
Söğütözü Cad. No:43, Söğütözü, Ankara, 06560, Turkey
Tel:+90 312 292 4257
STRUCTURAL DESIGN OPTIMIZATION OF VEHICLE COMPONENTS USING DIFFERENTIAL EVOLUTION
Ali R. YILDIZ, email@example.com Bursa Technical University, 16200, Bursa
Ismail DURGUN, firstname.lastname@example.org FIAT Automobile Factory, R&D Department, 16369, Bursa
In order to meet today’s vehicle design requirements and to improve the cost and fuel efficiency, there is an increasing interest to design light-weight and cost-effective vehicle components. In this research, a new optimization algorithm, called the Differential evolution (DE) algorithm, is introduced for solving structural design optimization problems. The DE algorithm is applied to the structural design optimization of a vehicle component to illustrate how the present approach can be applied for solving structural design problems. Results show the ability of the DE to find better optimal structural design.
SHAPE OPTIMIZATION OF BEAMS UNDER TRANSVERSE CRASH
Niyazi TANLAK, email@example.com Bogazici University, 34342, Istanbul, Turkiye
Fazıl Ö. SÖNMEZ, firstname.lastname@example.org Bogazici University, 34342, Istanbul, Turkiye
Mahmut ŞENALTUN, email@example.com Oyak-Renault Oto. Fab., Bursa, Turkiye
Box-shaped bumper beams are used in automotive industry as shock absorbers, which are subjected to transverse impact loads during crash. In this study, hollow beams fixed to a vehicle by means of brackets are considered. The vehicle hits a wall with 40% offset by 50 km/h speed. The objective of this study is to increase the crashworthiness of the beam by maximizing the total energy absorbed by the beam during crash. The crash event is simulated using explicit finite element method. The design variables are the parameters defining the cross-sectional shape of the beam. The beam is optimized using a hybrid search algorithm combining genetic and Nelder & Mead algorithms. The results indicate significant improvement in the crash-worthiness of the bumper beams.
THE VIBRATORY LOADS OF AN OPTIMIZED HELICOPTER ROTOR AT OFF-DESIGN CONDITIONS
Aykut TAMER, firstname.lastname@example.org TUSAŞ, 06980, Ankara
Evren TAŞKINOĞLU, email@example.com TUSAŞ, 06980, Ankara
Yavuz YAMAN, firstname.lastname@example.org Middle East Technical University, 06800, Ankara
The off-design vibratory loads of a helicopter rotor were studied for the purpose of achieving lower level of vibratory loads. The minimization for critical vibratory hub loads at a specified flight speed was achieved in a previous study. As a continuation to that study the analyses were conducted on the same light utility helicopter for the off-design conditions. The vibratory loads of the optimum blades and the original blades were analyzed at the off-design flight speeds and results were compared.
EFFECT OF REINFORCING ADDITIONS ON THE PERFORMANCE OF AL2O3-BASED CERAMIC CUTTING TOOLS USED IN MACHINING OF HARDENED AISI 420 STAINLESS STEELS
Erdem ACAR, email@example.com, TOBB University of Economics and Technology, 06560, Söğütözü, Ankara, Turkey
Necip CAMUŞCU, firstname.lastname@example.org, TOBB University of Economics and Technology, 06560, Söğütözü, Ankara, Turkey
Ali Osman ER, email@example.com, Kırıkkale University, 71450, Kırıkkale, Turkey
Ersan ARSLAN, firstname.lastname@example.org, Muş Alparslan University, 49100, Muş, Turkey
An experimental study is performed to investigate the effect of two different reinforcing additions, namely TiC and TiCN, on the performance Al2O3-based ceramic cutting tools on machining of hardened AISI 420 stainless steels. In addition, Taguchi experimental techniques are utilized to analyze the effects of three cutting parameters, namely cutting speed, feed rate and depth of cut on two performance measures, flank wear and surface roughness. Finally, the optimal cutting parameters are determined for TiC and TiCN reinforcing additions. It is found that the wear of the cutting tools and surface roughness in the workpiece were smaller for the case of TiCN reinforcement than TiC reinforcement. It is also found that for both of the reinforcement types, the same setting of machining process parameters results in the minimum flank wear and minimum surface roughness.
MULTI-OBJECTIVE OPTIMIZATION OF VEHICLE CRASHWORTHINESS USING PARTICLE SWARM OPTIMIZATION APPROACH
Ali R. YILDIZ, email@example.com Bursa Technical University, 16200, Bursa
Kiran N. SOLANKI, firstname.lastname@example.org, Arizona State University, School for Engineering of Matter, Transport, and Energy (SEMTE), USA
Vehicle crashworthiness is an important issue to ensure passengers safety and reduce vehicle costs in the early design stage of vehicle design. The aim of the crashworthiness design is to provide an optimized structure that can absorb the crash energy by controlled vehicle deformations while maintaining enough space of the passenger compartment. Meta-modeling and optimization techniques have been used to reduce the vehicle design cycle. In this paper, the particle swarm optimization algorithm is applied to multi-objective crashworthiness optimization of a full-vehicle model to demonstrate its effectiveness and validity.
Special Session: Design Science
Prof. Yoshiyuki Matsuoka (Keio University, Japan)
While the design by the 20th century brought people's life rich, it also produced many negative legacies such as safety and environmental problems and fulfillment of spiritual value. In order to solve these problems, the new viewpoint for the integration of each subdivided design is required.
Research topics in this area include:
- Design Science
- Design Integration
- Design Theory
- Design Methodology
- Design Method
- Timeaxis Design
“Design Science” - that is a new science theoretically explains design, the human act of creativity, going beyond the borders of each subdivided design such as product design and city/architectural design. This session focuses on new design theories and methodologies led by this leading-edge science aimed toward future creativity.
Dr. Koichiro Sato
Faculty of Science and Technology
3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Japan
VALUE GROWTH DESIGN MODEL BASED ON DESIGN SCIENCE
Time axis design (TAD) is a new design, which introduces a time axis into the theory and methodology of design, and value growth design (VGD) is one way to embody TAD. In VGD, the value of an object or product appreciates with time. Herein, literatures and case studies are analyzed, and a VGD methodology is proposed based on the analysis. Additionally, the features of value growth of an object are clarified. Moreover, viewpoints useful for the proposed VGD are discussed.
ANALYSIS OF A SOCIO-CULTURAL APPROACH TO COMMUNITY-MOBILITY SYSTEMS USING MULTISPACE DESIGN MODEL
Supporting social interaction in urban communities of Mexico City
In this study, Multispace Design Model was used for the analysis of a socio-cultural approach to community mobility systems. Analysis by use of Multispace Design Model allows addressing the increasing complexity of mobility design due to the necessity of taking into consideration issues regarding mobility operation, infrastructure and vehicles, as well as involving a wide range of disciplines from applied and social sciences. It was possible to identify measures and assignments necessary for the design of a future community mobility system aimed at fostering community social interaction.
DESIGN SCIENCE; MULTISPACE DESIGN MODEL
While the design by the 20th century brought people's life rich, it also produced many negative legacies. In order to solve these problems produced by subdivision of a design, the new viewpoint for the integration of each subdivided design is required. Firstly, this paper summarizes the context of conventional design which results in subdivision of a design. Secondly, this paper describes a framework for design science as the new viewpoint for the integration of each subdivided design. Moreover, this paper describes the multispace design model as a framework of design theory and design reasoning. Finally, this paper introduces the study on the integration of design based on the framework for design science and the view of the design in the 21st century.
QUALITY FUNCTION DEPLOYMENT BASED ON MULTISPACE DESIGN MODEL AND INTERPRETIVE STRUCTURAL MODELING
Due to the product diversification and complication, sharing the product information between the product development members has been important in the product development process. Quality Function Deployment (QFD) is one of the effective methods that enables the development members to share the information of the product using the quality matrices that describes the relationship between design elements needed to be considered. This paper improves the quality matrices by introducing the multispace design model and the Interpretive structural modeling (ISM). The proposed quality matrices are applied to a disc brake design problem, and their applicability is confirmed.
E-mail SYSTEM "KIZUNA VISUALIZER" DESIGNED BY USING MULTISPACE DESIGN METHOD
We developed an e-mail system designed to sustain and deepen “KIZUNA,” by which Japanese mean the precious bonds that exist between individuals. In the design process, we used the multispace design method. This design development resulted in us determining to visualize KIZUNA through self-organizing, transforming icons as a design concept. We therefore created 6 functions to show changes in the state of KIZUNA through changes in the form and color of icons made in correspondence to the exchange of e-mails. After considering the effects of the system, the potential of this system in sustaining and deepening KIZUNA was indicated.
Special Session: Micro Manufacturing Processes and Applications
Dr. Yiğit Karpat (Bilkent University, Turkey)
Dr. Sinan Filiz (Bilkent University, Turkey)
The demand for meso-scale (500 µm-10 mm) and micro-scale (0.1-500 µm) products with high aspect ratios and superior surfaces has been rapidly increasing in aerospace, automotive, defense, medical, optical, and micro-electronics packaging industries. Technologies for mass manufacturing of meso/micro parts and components in metal alloys, polymers and ceramics are still under development, and present a number of research issues and challenges. This special session invites contributions from academia and industry on recent advances and developments in micromanufacturing processes, materials for micro fabrication, miniature machine tools, instrumentation and strategies for metrology in order to provide an information exchange among researchers with different experiences. The research topics of the agenda will include (but not limited to):
- Micro-machining processes
- Micro-forming processes
- Manufacturability of the materials at micro scale
- Micro mold and die design and fabrication
- Modeling and simulation of micro-manufacturing processes
- Design and construction of miniature machine tools
- Enabling technologies: metrology, sensors, monitoring and control
- Micro-assembly and microfactories
Dr. Yiğit Karpat
Dr. Sinan Filiz
DEVELOPMENT OF A MODULAR SINGLE-AXIS SLIDER FOR HIGH PRECISION POSITIONING APPLICATIONS
In this paper, design and implementation of a modular single-axis micro/nano-positioning system which is driven by a permanent magnet linear motor is presented. The system is represented by modest amount of effort for mathematical modeling which is improved by series of experiments on open loop characteristics. Moreover, the system is proposed to be controlled by a PID controller. Conventional point to point position control, velocity control with trajectory planning and position control with trajectory planning approaches are accomplished and compared in terms of their suitability to the proposed system. The comparisons are supported by experimental results obtained with the single-axis slider mechanism. Using the position control with trajectory planning, better performance characteristics are observed. Moreover, experimental results have shown that trajectory planning approaches are more suitable for precision positioning applications due to their smooth motion characteristics.
MULTI SCALE MILLING FORCE MODELING THROUGH A FINITE ELEMENT SIMULATION BASED METAMODEL
In this study, a milling force model based on finite element simulation of orthogonal cutting process has been proposed. Design of computer experiments approach is used to obtain a metamodel based on finite element simulation results of machining titanium alloy Ti6AL4V. The metamodel is integrated into an analytical milling force model including tool runout effect to calculate milling forces at micro and macro scales. The proposed model yields results that
are in good agreement with measured milling forces.
DESIGN AND FABRICATION OF MICRO CUTTING TOOLS USING MICRO ELECTRO DISCHARGE MACHINING (Micro-EDM)
With the advent of sophisticated electro discharge machines, design and fabrication of micro cutting tools and their employment in micro machining operations have become a popular research area. These machines have been used to fabricate micro milling, drilling, and grinding tools made from tungsten carbide and polycrystalline diamond with diameters as low as 5-10 micrometers. Successful fabrication and application of micro tools require a great deal of process knowledge. In this study, a methodology based on analytical and computational process models is proposed and some preliminary results are presented.
MODELING CUTTING FORCE IN ELLIPTICAL VIBRATION CUTTING CONSIDERING THE TRANSIENT CHARACTERISTICS
In the field of ultra-precision micromachining, elliptical vibration cutting (EVC) has been found to be a better technique for machining of various materials, compared to the conventional cutting and conventional vibration cutting techniques. Analysis of cutting force plays a vital role in evaluating various machining performances. However, due to the continuous variation of transient thickness of cut and tool velocity in EVC, few studies have been carried out to determine the transient cutting force. In the present paper, a novel method is proposed for modeling the transient cutting force by considering the transient characteristics in the EVC process. The predicted cutting force values based on the proposed model are found to be in good agreement with the experimental data obtained from the conducted orthogonal EVC tests.
INVESTIGATION OF WEAR PERFORMANCE OF COATED MICRO ENDMILLS IN MICRO ENDMILLING PROCESS.
In this study, machinability of Inconel 718 Nickel alloy and effect of coating material on tool wear under micro conditions were investigated. In this context, coated (TiAlN+AlCrN, DLC, AlTiN, TiAlN+WC/C, AlCrN) and uncoated (WC-Co) tools were used during cutting tests. Wear occured on tools was identified depending on changes of tool diameter, cutting corner radius and machined slot geometries. The results show that coated tools have a good wear resistance compared to uncoated tool. Furthermore AlTiN, TiAlN+AlCrN, AlCrN coated tools show better performance compared to TiAlN+WC/C ve DLC. However, The results show that tool wear decreases when feed rate and depth of cut increased.