INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN)
Year:2005 | Volume:15 | Issue:5|Papers Count:19

In this paper, different methods of analysis are studied for the column base plates. Comparison is made between the experimental results and the effective and practical method proposed in here. This method uses the contact problem approach. Application of the prepared design monograms is illustrated using a simple practical problem.

In this research soldering property of copper terminal to silver heating circuit of automotive back glass have been investigated. The material of heating circuit is silver, Sn62 Pb36Ag2 soldering alloy for soldering heave been used. silver addition to Tin-Lead eutectic solder for 0,0.5,1,1.5,2,2.5 prevent for heating circuit, have done to prevent dissolution of Ag and soldering time set up in 5,6,7 second. The strength of solder joint when silver percent is less decreased. For decreasing of soldering heat effect to the glass 7%Bi have been additioned to the solder which decreased the melting point to 173.c. soldering time also is a major parameter that have been investigated. If soldering time increased over 5.5 sec. Residual stress cased that glass has broken in zero temperature.

The quality of silica used in glass industry effects the quality of product in a great deal. Presence of iron oxide causes different colors in glass and therefore is considered as an impurity. In this article ways for iron oxide reduction has been evaluated for the silica originated from Ghermez Abad mine using flotation. Flotation tests were designed either as direct or reverse and different collectors were applied either individually or collectively. Results showed that a dual collector system and pulp pH around 2-2.5 presents the optimum conditions. Increasing the conditioning time did not affect the iron oxide reduction process. For over 6 minutes it even showed an adverse effect as increasing the conditioning time from 6 to 9 minutes increased the iron oxide grade from 0.022% to 0.0238%. The optimum solid percentage was also found to be at 30%. Frother type and additional collector concentration did not lower iron oxide grade.

The presence of huge reserves of coal in Tabas area is caused to be one of the promising coal mine in Iran. The average percentage of sulfur in different layers namely B1, B2, C1, C2, D has reported 3.49, 1.35, 1.6, 1.11, 3.4 respectively. In order to identify the type and distribution of sulfur in coal sample, a representative sample from all effective working levels especially C1 layer has been taken and subjected to characterization studies. The results of investigation show that the percentage of total sulfur, pyritic sulfur, sulfate and organic one is 1.44, 0.77,0 and 0.67 respectively. The microscopic investigation shows that pyrite is present in the forms of discrete grains, fracture and cavity filling, regular and irregular framboidal with average particle size of 1 to 30 microns. However with SEM the presence of even finer than one micron particles of sulfur has been proved. The particle size analysis shows that high distribution of the total, pyritic and organic sulfur is present in the sieve ranges of +6.35 and -15.87 mm. The removal of such amount of sulfur is equivalent to lossing of 18.37 % of total feed to the tailing. The washability carves shows that due to present of high percentage of sulfur in coal lithotype and macerals, most of sulfur goes to concentrate and can not be remove by gravity techniques. Finally because of forms of pyrite distribution and presence of 46% sulfur in organic form, the reduction of sulfur can be possible by techniques like microbial and chemical process.

The process-orientation school of thought is an approach focuses on process in an organization to bring changes in business and removes the weakness of today's challenging organizations. Process is a theme of operations with interaction and relations among them with each other which all together brings valuable results towards the customers. There are lots of non-value added activities which should be removed and substituted with new value added activities in all organizations. In that case the organizations will focus on the value added activities to reach productivity by increasing in speed, quality and improvement in services which ultimately cause decreasing the production cost. This article focuses on importance of processes in organization, the role of process orientation in organizational productivity and the changes required to be done in processes to reach productivity by improving "Singh & Muckerjy" model of productivity which highlights the relation between the organizational change, processes and productivity.

A prerequisite for performance improvement is the ability to measure and analysis it. There are different performance measurement systems (PMS) available. Therefore, the selection of a suitable PMS is a major issuer for organizations. Introducing different PMS developed by researchers, this paper provides a basis to compare them and select the best one. In the regards they are ronled bawd on a comprehensive attributes and using fuzzy TOPSIS, as a malti -attribute decision making model.

World class manufacturing is one of the important and influential concepts and terminologies proposed (in industrial engineering) in recent years. It is said that WCM is the only subject indicating prevalence and significance of fundamental changes currently occurring in industrial organizations. There exist some different views in this regard. Authors differ with each other on considering WCM a philosophy, a process, a methodology or a goal. Authors and experts have proposed different definitions and features for WCM organizations. In the following article, concepts, definitions and features of a WCM organization has been discussed and different views have been studied. Various differences exist in definitions and features of a WCM organization. This article studies, discusses and classifies various views and proposes a new definition with consideration of manufacturing organization features in WCM and includes a systematic view and pays attention to key internal and external factors of an organization. In addition, this article proposes a conceptual model based on the new definition for internal and external factors of a WCM organization. The above - mentioned model can contribute to formulating of a strategy for organizations that are willing to achieve a world class manufacturing status.

In this paper a standard F.D. T.D method algorithm is presented. It can be applied in other F.D. T.D. problems with some alternatives. Also, an interesting implementation method in MATLAB has been applied, so it can decrease the run time substantially. The results of this method are studied in plane wave solutions.

In this paper, it is shown for the first time that an induction motor that has a turn fault can be driven at new operating points, by turning off the defected phase. The new permissible domain of operating points (PDOP) is a function of fault size, speed and torque, at which no fault enlargement would occur. The quality behaviors of the motor, the current of the short turns, the motor startup, and the scheme for determining PDOP are discussed. Although by turning off a phase, the maximum attainable torque is reduced sharply, but it is shown that driving the faulty motor in this way and in the PDOP, could tolerate higher speeds and higher fault sizes for the same load, in comparison to all phase drives. Experimental results presented support the validity of the achievements. The new PDOP are acceptable for many applications in which sustain of motor operation, even at a non rated point, is preferred to stopping the motor operation.

The computation of magnetic field distribution around conducting structures due to current-carrying conductors is used in a wide range of industrial applications, including eddy-current and magnetic-shielding problems. This paper presents an analytical modeling technique for evaluating the electromagnetic field distribution in magneto static regime due to an arbitrary wire loop in the vicinity of a conducting half space. The technique uses the two-dimensional Fourier transform to solve the governing equation formulated in terms of a magnetic scalar potential. The main feature of the model is its ability to analyze two and three-dimensional excitation geometry, with similar degree of computation burden. This feature stems from the fact that in this model, knowledge of the field distribution at the place of the conductor surface in free space suffices to compute the filed in the presence of the conductor. To demonstrate the accuracy of the model, we consider two special cases of rhombic and elliptic wire inducers. The comparison of our results with those obtained using the conventional algorithm in the literature validates the accuracy of the model introduced in this paper. To show the generality of the model, we also present results associated with a wire - loop inducer with a three - dimensional geometry for which no analytical solution is available in the literature.

For image data transferring and saving compression is inevitable; so the various compression methods have been developed. Among various methods the mapping of data image to uncorrelated coefficients and compression a large fraction of the average energy in a relatively few components is very important. The subband coding (SBC) is a powerful method to achieve this aim which performs better than the traditional orthogonal transform. In the sub band coding, the trade off between the resolution in space and frequency domain leads to indecision in choosing of the filter bank. Although the choice of sharp filter leads to a better frequency decomposition but the impulse response will spread out and this causes a ringing in the edge's area of the image; known as mosquito noise. In this paper it is illustrated that in the hierarchical decomposition; only at the primary levels the sharp filters is needed and for the next levels the taps of the filters could be reduced. This method preserves the mean square error of the reconstructed image and performs better for the sharpness of the edges. Furthermore, by this method the amount of the calculation would be extremely reduced.

The system of road transportation is one of the most important transportation systems in transportation of goods and passenger and it has a high value on transportation in developing countries. This system is divided to two parts infrasubstructure and fleets. In installation of substructure part, the investor in substructure installing is government with the goal of increasing public comfort, social justice and international credit and in fleet part the investor is the private sector. The goal of the investment in the fleet part is, increasing the profit with respect to servicing users of the system. If in this investment the profit of investment is more than the interest rate of the bank so it is reasonable, otherwise the private sector has no willing to invest. Therefore with this out look apprise of the road transportation in good and passenger's part is very important in the economic studies. In this paper development of the price model for the passenger service in road according to cost index with economic engineering techniques for Iran is proposed. During of the paper after the inspection of effective different problems in the road passenger, it inspects the total expense in person - kilometer distance and this study is based on real price in year 2002. And finally the price of passenger service according to person - kilometer distance is calculated on the designed model.

One important issue in application of implicit stochastic or long-term planning models to reservoir operation problem is how the set of optimal solutions should be aggregated to derive general operating rules. In this paper, a dynamic programming (DP) model, whose optimal solution is used as input to models inferring general operating rules, has been developed for optimizing a long-term reservoir operation problem. Subsequently, traditional least squares regression (OLSR), fuzzy regression (FR), and statistical analysis of optimal releases (AS) have been evaluated and tested in the problem of deriving reservoir operating rules. The problem of finding the coefficients of an FR model yields in solving a linear programming (LP) optimization model. The objective function of the LP is to minimize total fuzziness of the FR model. This objective is fulfilled through minimizing the support of fuzzy coefficients of the regression model subject to having observed values of the dependent variable confined within those values predicted by FR model. The OLSR, FR, and AS based rules are then simulated and compared based on their performance when they are applied to Dez reservoir system as the case study. The results indicate that although OLSR performs better than FR in terms of fitting capability, the rules derived by FR performs better in simulation, especially in the situations where imperfect and partially informative data are addressed. This implies that in facing with a data set which does not include some behavioral aspects of a given phenomena to be mode led, trying to find a regression equation which best fits the data available will not necessarily be the best approach. Instead, it should search for an equation which performs more robust, where situations not represented in data set are likely to occur in real world.

The behavior of indeterminate moment resisting RC frames under seismic lateral loads is a complicated phenomenon. Structural overstrength is one of the most important factors affecting this behavior. On the other hand many qualitative and quantitative factors affect the overstrength of frames. The other important factor related to the structural behavior is structural redundancy which in turn is under the influence of many other parameters. In order to estimate the overstretch and redundancy of RC moment resisting frames, 25 RC frames with 1, 2, 4, 6 and 10 stories, having 1, 2, 3, 4 and 5 bays are studied using nonlinear incremental static analysis method. The results of these analyses are compared and some relationships are proposed for estimating the overstrength and redundancy of frames in terms of the number of stories and bays.

An efficient method for fuzzy multi-criteria analysis of economic order quantity (EOQ) is proposed in this paper. The method uses the fuzzy logic for determining the reordering level of inventory, based on the fuzzy and uncertain data. The process of inventory control is faced with the unavailability and uncertainty of data and needed to be proceeding by the estimation of the data, using linguistic and fuzzy variables. Here a multi-objective method is used to prevent the complexity of the model and also to compare the estimated data. The optimality of the obtained results is examined using the effective elements of the inventory control procedure for changing a weighted fuzzy matrix to a normal fuzzy matrix. A good final result can be gained using the view of decision-maker, near to risk method and the proposed method.