Use of Response Surface Methodology and Exponential Desirability Functions to Paper Feeder Design
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1 Use of Response Surface Methoology an Exponential Desirability Functions to Paper Feeer Design HSU-HWA CHANG 1,*, CHIH-HSIEN CHEN 2 1 Department of Business Aministration National Taipei College of Business * 321, Sec. 1, Chi-Nan R., Taipei TAIWAN, R.O.C. 2 Department of Management Fo-Guang University 160, Linwei R., Jiaosi Shiang, Yilan County TAIWAN, R.O.C. hhchang@webmail.ntcb.eu.tw Abstract: - Applying parameter esign to a system that has a binary-type performance, an efficient metric is to employ the operating winow (OW) which is the range between two performance limit threshols. Paper feeer esign is a typical problem of the OW metho. The wier OW, the higher performance of the system is. This stuy uses an approach base on artificial neural networks (ANN) an esirability functions to optimizing the OW esign of a paper feeer. The approach employs an ANN to construct the response function moel (RFM) of the OW system. A novel performance measure (PM) is evelope to evaluate the OW responses. Through evaluating the PM of the preicte OW responses, the best control factor combination can be obtaine from the full control factor combinations. A simulate example of a paper feeer esign is analyze. Performing the approach to parameter esign problems, engineers o not require much backgroun in statistics but instea rely on their knowlege of engineering. Key-Wors: - Artificial Neural Networks, Exponential Desirability Functions, Operating Winows, Response Surface Methoology, Response Function Moel, Paper Feeer Design 1 Introuction While performing parameter esign, engineers often encounter the situation that a system has a binary-type performance (i.e. goo or ba, 0 or 1). A common way to quantify the system s performance is to compute the ratio of ba results to total results (i.e., a percentage of efective results) then transfer the percentage into Taguchi s SN ratio of STB [10, 16]. This metho may nee a large number of experiments when the rate of failure is low; besies, the information of experiments ata cannot be exploite to the analysis. A more efficient metric is to employ the operating winow (OW) which is the range between two performance limit threshols. The wier OW, the higher performance of the system is [3]. The concept of the OW was evelope by Clausing [2]. He use an OW response for the esign of a friction-retar paper feeer in a copier machine. The function of a paper-feeing mechanism in a copier machine to fee exactly one sheet of paper each time the mechanism receives an input signal. When the mechanism oes not fee any paper, it is calle misfee. When two or more sheets of paper are fe into the copier machine at the same time, it is calle multifee. As shown in Figure 1, this mechanism applies friction between the feeer roller an the paper, an the torque of the fee roller fees the paper into the printer [3, 8]. The friction force between the fee roller an the paper is etermine by the spring force applie below the paper tray. When the spring force is too small, no paper will be sent out of the paper tray (misfee). When the spring force is properly set, one sheet of paper will be sent out. When the spring force is set too large, two or more sheets might be sent out of the tray (mulitfee). The objective the paper feeer esign is to minimize the rate of both failure moes, i.e., misfee an mulitfee. Herein, spring force is a critical ISSN: Issue 1, Volume 7, January 2008
2 parameter of the paper feeer an is easy to measure. Let the threshol value of the spring force for sening one sheet of paper be x (gram-force). Let the threshol value of the spring force for multifeeing two or more sheets be y (gram-force). We can fin two threshol values of the force at which the misfee stops (x) an at which the multifee starts (y). Then, (x, y) forms the OW [16]. Fee roller with encoer 2 Sensor 1 Fig.1 Paper feeer mechanism Thus, the objective of the paper feeer esign becomes to minimize x to ecrease number of misfees, an to imize y to ecrease number of multifees. Figure 2 shows two situations of an operating winow. The operating winow of situation B is wier an has a greater robustness than the winow for situation A [17]. A B F2 Misfee x Misfee Retar roller Encoer 1 F1 Operating Winow Operating Winow x y Paper stack y Multifee Force Multifee Fig.2 Operating winow. Tray Force The two failure moes can be eliminate if x is reuces to zero an y is increase to infinity. Therefore, x is a small-the-better (STB) characteristic an y is a larger-the-better (LTB) characteristic. The optimization of the OW can be treate as to optimize simultaneously the responses of both STB an LTB in a system. The response function methoology (RSM) is an efficient approach to for the moeling an analysis of problems in which one or more response of interest are influence by several control factors. Using the RSM, one can fin the relationship between the responses an control factors, an then to optimize the responses [11]. Accoringly, this stuy uses the RSM to moel the paper feeer s OW responses. The response function moel (RFM) is built by training an artificial neural network (ANN). The well-traine ANN can be applie to preict all possible OW responses by inputting full control factor combinations. To optimize simultaneously the responses of x an y, exponential esirability functions are use to integrate the two response into a single measure. Finally, the best control factor combination can be obtaine by imize the single measure. The rest of this paper is organize as follows. Section 2 introuces the ANN approach. Section 3 applies the exponential esirability functions to measure the STB an LTB response. Section 4 proposes the resolving approach for paper feeer esign. Section 5 implements the approach to a paper feeer esign. Conclusions are provie in Section 6. 2 ANN ANN has been successfully applie to etermine the optimal parameter esign of a process [6, 7]. Applying the metho, the ANN is traine by the results of a fractional factorial esign, an is then use to estimate the response values for the full factorial esign. Among the successful implementations of an ANN, the backpropagation (BP) training metho is most reliable. The most use non-linearity for the BP algorithm is a sigmoi logistic function [12, 15]. The best structure of an ANN is ientifie through comparing the root of mean-square-error (RMSE) of each structure. This error-calculation metho is use to etermine the amount of variance between the expecte an actual outputs of an ANN. The lower the RMSE, the better the ANN preicts. Several structures of neural networks with ifferent numbers of hien layers an neurons in each hien layer are teste to fin the best structure with the lowest RMSE. The processes of training a well network are as follows: Step 1. Determine the artificial neural networks structure, initial connection weights, an ISSN: Issue 1, Volume 7, January 2008
3 offsets. Step 2. Present inputs an esire outputs. Step 3. Calculate the actual output. Step 4. Calculate the RMSE. Step 5. Ajust the weights of the networks. Step 6. Repeat steps 2 5 for each training pair until the RMSE of the entire set is acceptably low. Several structures of neural networks with ifferent numbers of hien layers an neurons in each hien layer are selecte an are teste to fin the best structure with the lowest RMSE. Then the weights of all the links of the networks are ecie. 3 Exponential Desirability Functions The exponential esirability function approach was introuce by Harrington [5] an further moifie by Kim an Lin [9] an Chang [1]. The exponential esirability function transforms an estimate response (e.g. the rˆj estimate response) to a scale-free value j, calle esirability. It is a value between 0 an 1, an increases as the esirability of the corresponing response increases. Goik et al. [4] firstly applie esirability functions to operating winows esign. To evaluate ifferent types of quality characteristics, the esirability functions are employe here an are slightly moifie. For the LTB type with lower specification limit (LSL), the esirability function of the value (enote by (2). LTB ) is formulate as Equations (1) an LTB LTB = exp( (exp( Z ))) (1) where LTB rˆ r Z min =, (2) rmin r min represents the LSL of response r. For the STB type with upper specification limit (USL), the esirability function of the value STB (enote by ) is formulate as Equations (3) an (4). STB STB = exp( (1 +Z )) (3) where STB rˆ r Z =, (4) r r represents the USL of response r. 4 The Approach The propose approach for analyzing the OW response problem comprises three phases. The first phase involves collecting experimental ata for training an ANN to represent the RFM of the system, which is capable of preicting the corresponing OW responses by giving a specific factor combination. In the secon phase, two novel performance measures erive from exponential esirability functions are evelope for evaluating the OW responses. The thir an final phase provies the integration of performance measures an the optimization processes which imize the OW responses by using the RFM an the measures. Figure 3 shows the flowchart of the approach. The etails of the three phases are escribe in Sections Ientify the problems: OW responses, control factors, an noise factors Conuct the experiment an collect the ata Calculate the performance measures Ientify the training an testing patterns Train several ANNs an select the best one as the RFM Preict the OW response of full factor combination Calculate all performance measures Obtain the best OW responses an the corresponing factor combination Fig. 3 The flowchart of the approach ISSN: Issue 1, Volume 7, January 2008
4 Response Function Moel This phase uses an ANN to moel the response function. The input an output ata are assigne as the level values for the control factor an the OW responses, respectively. A well-traine ANN represents the system s RFM. For etaile iscussion on how an ANN applie to parameter esign, reaers can refer to Rowlans et al. [13]. The process of the response function moeling consists of four steps, which are as follows: Step 1. Ranomly select the training an testing patterns from the experimental ata. Step 2. Select several ANN structures incluing input noes, hien layers, hien noes an output noes. Step 3. Set learning rate, momentum coefficient an executions iterations for each ANN structure. Step 4. Train an choose a well-traine ANN as the RFM, which establishes the relationship function between control factors an OW responses of the system. Performance Measures For the paper feeer esign, two OW responses (i.e., x an y) are simultaneously etermine by of the system s control factor combinations. To measure the performance of the response x an y, the exponential esirability functions are employe here. For the response x, the esirability can be formulate as Equation (5). x xˆ x = exp 1+ x, (5) where x represents the USL of the OW response x, which is etermine by the esigner. For the response y, the esirability can be formulate as Equation (6). ˆ y exp exp y = y ymin y min min, (6) where represents the LSL of the OW response y, which is etermine by the esigner. feeer system, two OW responses nee to be integrate into a single performance measure (enote by PM). To enhance the overall performance PM, the optimizing of the OW response problem can be state as: x y Maxminize PM = (7) The optimization processes for obtaining optimal control factor combination are as follows: Step 1. Preict all possible OW responses of the system by presenting full control factor combinations to the RFM. Step 2. Calculate the overall performance (i.e., PM value) of each response at each combination. Step 3. Compare the overall performance an obtain the best one an the corresponing control factor combination. 5 Implementation A simulate example of paper feeer esign is execute for obtaining the experimental ata. Six control factors, A, B, C, D, E an F, are selecte an are allocate in the L 18 orthogonal array (OA) for the experiments [13]. Table 1 lists the control factor levels an their allocations. The simulate experimental ata incluing misfee threshol (x) an multifee threshol (y) are liste in Table 2. The USL an LSL for the threshols x an y are set as 500 an 400 grams, respectively. Table 1 The control factors an their allocations Column Levels Label Factors in L Pa coefficient A 1 Low High - of friction Retar pa B 4 Low Nominal High force Retar angle C (egree) Fee roll to pa D 6-2mm Centere +2mm lateral offset With of fee E belt (mm) F Roll velocity 8 Low Nominal high Optimum obtaining To measure the overall performance of the paper The RFM can be built through training an ANN moel. The ANN is traine by assigning the levels of ISSN: Issue 1, Volume 7, January 2008
5 control factors an the values of threshols (i.e., x an y) as the inputs an outputs of the network. Eight patterns are ranomly selecte for testing an 64 patterns are selecte for training. The learning rate is set as auto-ajusting between 0.01 an 0.3. The momentum coefficient is set as The number of iterations is set as 15,000. Table 3 lists several options of the network architecture; furthermore, the structure with the lowest testing RMSE, , is chosen to obtain a better performance. Table 2 The allocations of the control factors an the experimental ata Experiment Control factor array No. A B C D E F x value (gram) y value (gram) Table 3 The caniate ANN moels Architecture RMSE Training Testing Through the RFM, the responses x an y uner any possible combinations of control factors can be accurately preicte. Then, the PM value of the responses x an y can be calculate easily by applying Equations (5) (7). Table 4 lists six factor combinations that have larger PM values. Paper feeer esigners can freely choose appropriate control factor combinations from Table 5 uner the consierations of cost, time, an material. Moreover, the control factor combinations (A 2, B 3, C 1, D 3, E 3, F 2 ) is the best one in terms of PM value. 6 Conclusion In this stuy, an ANN-base approach is propose to ISSN: Issue 1, Volume 7, January 2008
6 resolving the operating winow esign of a paper feeer. The approach consists of three phases. First, an ANN is traine to represent the RFM of the system. Secon, the PMs of the preicte OW responses are evaluate by presenting full combinations of control factors into the RFM. Finally, the best control factor combination can be obtaine by imizing the PM value. The implementation of the paper feeer esign reveals the approach s effectiveness. Performing the approach, engineers o not require much backgroun in statistics but instea rely on their knowlege of engineering. Besies, no costly statistical software package is neee when engineers employ the approach. Engineers can gain a software package of ANN at a relatively low cost, thereby increasing their esire to aopt the approach. The propose approach can be also applie to other inustrial systems that have binary-type performance such as wave solering an resistance weling. Furthermore, in future research, some meta-heuristics techniques such genetic algorithm an simulate annealing can be consiere introucing to the optimization process for improving the effectiveness of the approach. Table 4 Six factor combinations that have larger PM values No. Control factor settings ˆx ŷ x y PM value 1 A 2 BB3 C 1 D 3 E 3 F A 2 BB3 C 1 D 3 E 2 F A 2 BB3 C 1 D 3 E 3 F A 2 BB3 C 1 D 3 E 2 F A 2 BB3 C 1 D 3 E 3 F A 2 BB1 C 1 D 3 E 1 F Acknowlegements This research project was sponsore by the National Science Council of Taiwan uner Grant No. NSC H References: [1] Chang, H.H., Dynamic multi-response experiments by backpropagation networks an esirability functions, Journal of the Chinese Institute of Inustrial Engineers. Vol.23, No.4, 2006, pp [2] Clausing, D.P., Operating winow: an engineering measure for robustness, Technometrics, Vol.46, No.1, 2004, pp [3] Fowlkes, W.Y. an Creveling, C.M., Engineering Methos for Robust Prouct Design, Aison-Wesley, [4] Goik, P., Liy, J.W. an Taam, W., Use of esirability functions to etermine operating winows for new prouct esigns, Quality Engineering, Vol.7, No.2, , pp [5] Harrington, E.C., The esirability function, Inustrial Quality Control, Vol. 21, 1965, pp [6] Hsieh, K.L., Process parameter optimization via ata mining technique, Proceeings of the 6th WSEAS International Conference on Simulation, Moelling an Optimization, 2006, pp [7] Hsu, C.M., Su, C.T. an Liao, D., Simultaneous of the broaban tap coupler optical performance base on neural networks an exponential esirability functions, International Journal of Avance Manufacturing Technology, Vol.23, 2004, pp [8] Joseph, V.R. an Wu, C.F.J., Operating winow experiments: a novel approach to quality improvement, Journal of Quality Technology, Vol.34, No.4, 2002, pp [9] Kim, K.J. an Lin, D.K.J., Simultaneous optimization of mechanical properties of steel by imizing exponential esirability functions, Applie Statistics (Journal of the Royal Statistical Society: Series C), Vol.49, No.3, 2000, pp [10] Maghsooloo, S., Ozemir, G., Joran, V. an Huang, C.H., Strengths an limitations of Taguchi s contributions to quality, manufacturing, an process engineering, Journal of Manufacturing systems, Vol.23, No.2, 2004, pp [11] Park, S.H., Robust Design an Analysis for Quality Engineering, Chapman & Hall, Loon, UK, ISSN: Issue 1, Volume 7, January 2008
7 [12] Pricipe, J.C., Euliano, N.R. an Lefebvre, W.C., Neural an Aaptive systems, John Weily & Sons, Inc, [13] Rowlans, H., Packianather, M. S. an Oztemel, E., Using artificial neural networks for experimental esign in off-line quality. Journal of Systems Engineering, Vol.6, 1996, pp [14] Samuel, N. an LaVallee, L., Application of Taguchi metho to friction retar feeer esign, Case Stuies & Tutorials: 8th Taguchi Symposium, ASI, 1990, pp [15] Shen C.C., Cheng, S.H. an Hsieh, K.L., The construction of cost-benefit system via ANNs technique, Proceeings of the 6th WSEAS International Conference on Artificial Intelligence, Knowlege Engineering an Data Bases, 2007, pp [16] Taguchi, G., Taguchi on Robust Technology Development, AMSE Press, New York, [17] Wu, Y. an Wu, A., Taguchi Methos for Robust Design, ASME Press, 2000 ISSN: Issue 1, Volume 7, January 2008
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