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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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International Journal of Engineering, Science and Technology
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2141-2839
Published by African Journals Online Homepage  [261 journals]
  • A process capability index for zero-inflated processes

    • Authors: Surajit Pal, Susanta Kumar Gauri
      Pages: 1 - 10
      Abstract: The proportion of zero defect (ZD) outputs is as an integral characteristic of a zero-inflated (ZI) process or high quality process. Different ZI processes can almost equally satisfy the same USL of number of defects but they can produce substantially different proportions of ZD products. The application of conventional method for process capability evaluation fails to discriminate these processes because in the conventional method, the process capability is evaluated taking into consideration the USL of number of defects only. In this paper, a new measure of process capability for ZI processes is proposed that can truly discriminate different ZI processes taking into account the USL of number of defects as well as the proportion of ZD units produced in these processes. In the proposed approach, at first a measure of process capability index (PCI) with respect to the USL is computed, and then the overall PCI is obtained by multiplying it with an appropriately defined multiplying factor. A real-life application is presented.
      PubDate: 2022-11-03
      DOI: 10.4314/ijest.v14i2.1
      Issue No: Vol. 14, No. 2 (2022)
  • Performance investigation of ANFIS and PSO DFFP based boost converter with
           NICI using solar panel

    • Authors: C. Nagarajan, K. Umadevi, S. Saravanan, M. Muruganandam
      Pages: 11 - 21
      Abstract: The modeling and development of the boost DC to DC converter with Partial Swarm Optimization with Distinctive Feed Forward Propagation (PSO-DFFP) controller for hybrid power systems including solar panels. The static and dynamic investigation of the developed PSO DEEP controller is presented. The PSO-DFFP controller has been designed to improve the operating efficiency and reduces the input converter current ripple. The PSO DFFP controller is developed and performance is compared with ANFIS and FLC. The developed system reduces the switching losses and voltage drops in switching modes. The designed system is demonstrated and developed with 200W, 100kHz model. The investigation results is exposed that the developed PSO DEEP system is an acceptable for SOLAR applications.
      PubDate: 2022-11-03
      DOI: 10.4314/ijest.v14i2.2
      Issue No: Vol. 14, No. 2 (2022)
  • Joint-design effect on the metallurgical and mechanical behavior of duplex
           stainless steel welds

    • Authors: Rajat Dhiman, Sorabh Singhal, Ravindra K. Saxena
      Pages: 22 - 33
      Abstract: In the present investigation, the influence of joint design on the microstructure and the mechanical properties of SAF 2205 duplex stainless steel welds are reported. Plates with two different joint designs were welded using the gas tungsten arc welding process. To investigate the sole effect of joint design, the joints were designed in such a way that both joints have similar groove volumes. The weldments were investigated for microstructural characterization, ferrite content, and microhardness study; later, they were subjected to Charpy V-notch impact test, transverse tensile test, and fatigue testing in order to investigate the mechanical performance. Both the weld joints were able to achieve 100% joint efficiency in view of the transverse tensile test. Different weld joint configurations demonstrated the influence of the differential heat dissipation characteristics of the joints, evident from different morphological features revealed through optical microscopy of the weldment. The welding affected the ferrite(α)-austenite(γ) ratio of the weld metals and differed the welds in terms of ferrite content in the root and weld pass. The weld zone of the U-joint showed a 65.8% ferrite fraction and thus showed 18% more hardness as compared to the V-joint, while the V-joint had the highest yield stress of 617 MPa. The study revealed that the U-joint performed better in comparison to the V-joint in terms of microhardness, impact toughness, and fatigue behavior. The U-joint could resist around 15% more fatigue cycles than the V-joint under high cycle fatigue.
      PubDate: 2022-11-03
      DOI: 10.4314/ijest.v14i2.3
      Issue No: Vol. 14, No. 2 (2022)
  • Process control for categorical (ordinal) data

    • Authors: Nandini Das
      Pages: 34 - 40
      Abstract: Quality improvement is playing the key role in the success of a business. Reduction of variability is the main step for improvement of quality. Control charts are developed for the purpose of monitoring the quality characteristics with the aim of reducing variability. In many industries instead of continuous variable categorical (ordinal) data are used to measure the quality characteristics of interest. Hence developing control charts techniques for monitoring ordinal data has become a recent research focus. Quality control practitioners often face a problem to select the appropriate technique for monitoring ordinal data in the practical field since there are quite a few techniques available in the literature for this purpose. In this paper we have studied the various techniques for monitoring ordinal data and compared their performance to detect the shift in location parameter. Data were simulated from Normal distribution and average run length (ARL) were computed for different values of shift in mean (both in positive and negative direction) using different methodologies under study. The best technique to detect the shift was identified with respect to ARL.
      PubDate: 2022-11-03
      DOI: 10.4314/ijest.v14i2.4
      Issue No: Vol. 14, No. 2 (2022)
  • Optimization of vibration amplitude ratio of face mill tool of VMC and
           analysis with design expert to endorsing shim design

    • Authors: Nayana B. Gandhi, Divyang H. Pandya
      Pages: 41 - 50
      Abstract: This paper presents the concept, design and development of shim (passive damper) to improve the stability for high spindle speed machine operation of face mill tool. The objective of this paper is to learning the dynamic behavior of a face mill tool on VMC with dissimilar types of shims which cover investigation of dynamic motion behavior of the face mill tool, the behavior of different types of shim design and behavior of vibration by using the amplitude ratio method and analysis by a Design Expert. Research work supported computational analysis with Ansys, 35 VMC experimental records and analyzed by ANOVA/Design Expert with different type of shims to observe a dynamic behavior of chatter. It include of the effect of process parameters like Cutting speed (250,200,150 m/min), feed per tooth (0.05, 0.1, 0.15mm/tooth), depth of cut (1.2 mm, 1.0 mm, 0.8 mm), and different types of materials (shims) for face mill tool on VMC, for analyzing the responses like amplitude ratio in X – direction, Y- direction with ANOVA and optimizing for AISI 2062 steel by Design Expert. An experimental methodology was developed using the DOE (Design of experiment) technique. The optimum factorial method was used to design an orthogonal array of four factors having three levels. Here, the main results are based on amplitude ratio, ANOVA analysis and optimization. ANOVA was used to decide the effects of the machining parameters on the vibration amplitude ratio in X; and vibration amplitude ratio in Y. This is useful for evaluating the stability of milling operations via time domain FFT and analyzed by ANOVA. Data are validated by 35 sets of VMC experiments. Physical 35 experiments may be not enough in a view of high level researchers, academicians and industrialist to conclude the use of shim and it need in face mill tool on VMC. Hence here optimization based on optimum factorial method is executed using Design Expert software in which 35experiments and its iterations with 70 populations were used to run the program. It is found that the most critical parameter in this study is the material of Shim. At high cutting parameters carbide shim, at low and medium cutting parameters SS shim are given better results by ANOVA and Optimization of Design Expert also validated by 35 sets of VMC experiments. Hence these shim designs endorse versatile solutions.
      PubDate: 2022-11-03
      DOI: 10.4314/ijest.v14i2.5
      Issue No: Vol. 14, No. 2 (2022)
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