• Title/Summary/Keyword: Taguchi robust design

Search Result 173, Processing Time 0.023 seconds

Robust Design of vehicle Intoner Noise using Taguchi method and Substructure Synthesis Method (다구찌법과 부분구조합성법을 이용한 차실소음 강건설계)

  • Kim, Hyo-Sig;Tanneguy, DE-KERDREL;Kim, Hee-Jin;Cho, Hyo-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2005.11b
    • /
    • pp.134-139
    • /
    • 2005
  • This paper presents a robust design of vehicle interior noise using Taguchi method and a substructure synthesis method with a hybrid model. Firstly, the proposed method identifies the critical process of the concerned interior noise through a TPA (Transfer Path Analysis). Secondly, a strategy for a robust design is discussed, in which the major noise factor among uncertainties in the process is quality distribution of rubber bushes connecting a cradle and a trimmed body. Thirdly, a virtual test model fer the process is developed by applying a substructure synthesis method with a hybrid modeling approach. Fourthly, virtual tests are carried out according to the predefined tables of orthogonal array in Taguchi robust design process. The process was performed under 2 sub-steps. The first step is sensitivity analysis of 31 panels, and the other step is weight optimization of mass dampers on sensitive panels. Finally, two vehicles with the proposed countermeasures were validated. The proposed method reduces 87.5% of trials of measurements due to the orthogonal arrays and increases robustness by 8.6dB of S/N ratio and decreases $5\;dB(A){\sim}10\;dB(A)$ of interior noise in the concerned range of RPM.

  • PDF

Multiple Response Optimization for Robust Design using Desirability Function

  • Kwon, Yong-Man;Hong, Yeon-Woong;Chang, Duk-Joon
    • Journal of the Korean Data and Information Science Society
    • /
    • v.14 no.2
    • /
    • pp.325-335
    • /
    • 2003
  • Robust design is to identify appropriate settings of control factors that make the system's performance robust to to changes in the noise factors that represent the source of variation. In the Taguchi parameter design, the product array approach using orthogonal arrays is mainly used. However, it often requires an excessive number of experiments. An alternative approach, which is called the combined array approach, was suggested by Welch et. al. (1990) and studied by others. In these studies, only single response variable was considered. We propose how to simultaneously optimize multiple responses when we use the combined array approach.

  • PDF

Development of Reliability Design Methodology Using Accelerated Life Testing and Taguchi Method (가속 수명시험과 다구치 방법을 활용한 신뢰성설계 방법의 개발)

  • Kim, Min;Yum, Bong-Jin
    • Journal of Korean Institute of Industrial Engineers
    • /
    • v.28 no.4
    • /
    • pp.407-414
    • /
    • 2002
  • The inherent reliability of a product is primarily determined in the design stage, and therefore, design engineers should be able to design reliability into the product in an efficient manner. Especially, the product should be designed such that its reliability is robust to various noise factors encountered in production and field environments. The Taguchi method can be effectively used for this purpose. However, there exist only a few attempts to integrate the Taguchi method with reliability design, and in addition, the existing works do not sufficiently consider the robustness and/or the distinction between noise and acceleration factors. This paper develops a unified approach to robust reliability design assuming that accelerated life tests are conducted at each combination of design and noise conditions. First, an experimental structure for assigning not only acceleration but also noise factors is presented. Second, the reliability at the use condition is estimated using the assumed accelerated life test model. Third, reliabilities are transformed into 'efforts' using an effort function which reflects the degree of difficulty involved in improving the reliability. Finally, an optimal setting of design parameters is determined based on the mean and standard deviation of the effort values. The above approach is illustrated with an example of a paper feeder design.

Taguchi's Robust Design Method for Optimization of Lysophosphatidic Acid Production in an Open Reactor System

  • Han, Jeong-Jun;Rhee, Joon-Shick
    • Journal of Microbiology and Biotechnology
    • /
    • v.8 no.1
    • /
    • pp.81-88
    • /
    • 1998
  • The determination of appropriate parameters and parameter conditions is very important for the optimization of production of target materials. Taguchi's method has been used widely as the basis for development trials and optimization during industrial process design. Reaction variables which influence product yield are easily determined and their effects are revealed by just a few reactions, negating the need for extensive experimental investigation. There are usually some factors that are responsible for variations in process characteristics, so called noise factors. Controlling noise factors is very costly and difficult or impossible. Taguchi's experimental design method was examined to determine the control factor's level that is less sensitive to the changes in environmental conditions and other noise factors without control of noise factors. In this study, optimization of lipase-catalyzed production of lysophosphatidic acid (LPA) which has various physiological functions was performed by Taguchi's method. We obtained LPA yields ($66.5\%$) with low variance (5.32) at 400 RPM, molar ratio of 40 : 3 (mol) (fatty acid: G-3-P), 48 h, and $50^{\circ}C$. Thus, bioactive LPA with a desired fatty acid moiety could be produced with high yields and low variance despite various environmental noise factors.

  • PDF

A Taguchi Approach to Parameter Setting in a Genetic Algorithm for General Job Shop Scheduling Problem

  • Sun, Ji Ung
    • Industrial Engineering and Management Systems
    • /
    • v.6 no.2
    • /
    • pp.119-124
    • /
    • 2007
  • The most difficult and time-intensive issue in the successful implementation of genetic algorithms is to find good parameter setting, one of the most popular subjects of current research in genetic algorithms. In this study, we present a new efficient experimental design method for parameter optimization in a genetic algorithm for general job shop scheduling problem using the Taguchi method. Four genetic parameters including the population size, the crossover rate, the mutation rate, and the stopping condition are treated as design factors. For the performance characteristic, makespan is adopted. The number of jobs, the number of operations required to be processed in each job, and the number of machines are considered as noise factors in generating various job shop environments. A robust design experiment with inner and outer orthogonal arrays is conducted by computer simulation, and the optimal parameter setting is presented which consists of a combination of the level of each design factor. The validity of the optimal parameter setting is investigated by comparing its SN ratios with those obtained by an experiment with full factorial designs.

Robust Design of Engine Head Gasket (엔진 헤드 개스킷 강건 설계)

  • Lee, Seungwoo;Yang, Chulho
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.24 no.4
    • /
    • pp.416-424
    • /
    • 2016
  • A robust design of head gasket is pursued by using FEA model of engine assembly. Engine assembly model consists of cylinder head, block, gasket, and head bolt is constructed to understand a complex behavior of this engine compound. Thermal loading is performed on the assembled engine cylinder and block to obtain temperature field. Firing load is added to the results of heat transfer analysis to simulate the engine operation condition. Temperature filed results from heat transfer analysis are mapped into the structural mesh. Contact pressure distribution along the bead has been monitored for the engine operation condition. Based on the results obtained from the analysis, Taguchi method has been adopted for a robust design process of head gasket. Among the control factors, bolt size affects most robustness of head gasket sealing.

A Comparative analysis of three Signal-to-Noise ratios of dynamic characteristics parameter design (동특성 파라미터 설계의 3종류 SN비 비교 분석)

  • 이상복
    • Journal of Korean Society for Quality Management
    • /
    • v.29 no.4
    • /
    • pp.82-91
    • /
    • 2001
  • Taguchi robust design is widely used to quality improve methods. Especially, interest of dynamic characteristics parameter design is getting grow. In this paper, we have a comparative analyzed three Signal-to-Noise Ratios which are used in American Supplier Institute(ASI), MINITAB and Taguchi series published by Japanese Standard Institute with numerical examples.

  • PDF

Minimization of Warpage in Injection-molded Parts By Optimal Design of U-type Ribs (U자형 리브의 최적설계에 의한 사출제품의 휨 최소화)

  • Park, Jong-Cheon;Kim, Kwang-Ho;Kim, Kyung-Mo;Koo, Bon-Heung
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.7 no.1
    • /
    • pp.53-61
    • /
    • 2008
  • In this research, the layout and geometry of U-type ribs in the part, including significant process conditions, are automatically optimized to reduce part warpage with robustness in consideration. The optimization procedure are based on an iterative redesign methodology integrated with computer aided injection molding simulation, Taguchi's Design of Experiment(DOE), and a direct search-based optimization method. The robustness of a design alternative is efficiently measured by introducing composite noise factor and Taguchi's signal-to-noise ratio. As a solution search methodology, the modified design space reduction method based on orthogonal arrays is employed to exploit an optimal robust design alternative. To illustrate the proposed methodology, a case study is performed on simulation results, where an optimal robust design alternative is obtained with a moderate number of iterations.

  • PDF

A Study on Friction Characteristics for Motorcycle Disk Using Taguchi Experimental Design (다꾸지 기법에 의한 이륜자동차 브레이크 디스크의 마찰특성에 관한 연구)

  • Juen, H.Y.;Ryu, M.R.;Lee, S.J.;Park, H.S.
    • Journal of Power System Engineering
    • /
    • v.10 no.3
    • /
    • pp.67-72
    • /
    • 2006
  • The effect of manufacturing parameters on wear and improve cooling of motorcycle break system was studied using a disk-on-pad type friction tester. Such parameters conditions have an effect on the wear and improve cooling factor such as applied load, sliding speed, frictional time and number of ventilated disk hole. However, it is difficult to know the mutual relation of these factor. In this study, the wear and cooling characteristics using design of experiment containing 4 elements were investigated for an optimal condition for the best motorcycle disk break system employing Taguchi robust experimental design. From this study, the result was shown that vents have an effect on convection area improving more cooling ability and reduced wear of the disk.

  • PDF

Robust Optimization of the Automobile Rearview Mirror for Vibration Reduction (승용차용 후사경의 진동 저감을 위한 강건최적설계)

  • 황광현;이광원;박경진
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.7 no.6
    • /
    • pp.198-206
    • /
    • 1999
  • An automobile outside rear view mirror system has been analyzed and designed to reduce vibration with a finite element model. model analysis is conducted for the calculation of natural frequencies. harmonic analysis is utilized to estimate the displacements of the glass surface under dynamic loads. The model is verified with the vibration experiment of the parts and the assembled body. The structure of the mirror system is optimized for the robustness defined by the Taguchi concept. At first, many potential design variables are defined. Final design variables are selected based on the amount of contribution on the objective function. That is, sensitive variables are chose. The SN ratio in the Taguchi method is replaced by an objective function with the mean and the standard deviation of the quality characteristic. The defined objective function is appropriate in the structural design in that the vibration displacements are minimized while the robustness is improved.

  • PDF