Mulat Alubel Abtew, Subhalakshmi Kropi, Yan Hong and Linzi Pu
-Khabeery M. M., “Statistical Process Control Charts Applied to Steelmaking QualityImprovement”, Quality Technology & Quantitative Management, vol.3 (4), pp.473-491, 2006.
 Omar, M. H., “Statistical Process Control Charts for Measuring and Monitoring Temporal Consistency of Ratings”, Journal of Educational Measurement, vol. 47(1), pp.18-35, 2010.
 Victor, E. S., Jaideep G. M. and Michael J. S. (1994), “δ Charts for Short Run Statistical Process Control,” International Journal of Quality & Reliability Management, vol.11 (6), pp.50
Quality is a certain degree of excellence and is one of the important factor in realization of the production process. Evaluation of the quality excellence in production project management is connected with a process of making changes in particular phases of project realization. The thesis proposed in the article is: the effective quality improvement based on implementation of the quality management method contributes to achieve the planned quality in the production project.
The Fault Tree process utilizes logic diagrams to portray and analyse potentially hazardous events. Three basic symbols (logic gates) are adequate for diagramming any fault tree. However, additional recently developed symbols can be used to reduce the time and effort required for analysis. A fault tree is a graphical representation of the relationship between certain specific events and the ultimate undesired event (2). This paper deals to method of Fault Tree Analysis basic description and provides a practical view on possibility of application by quality improvement in road freight transport company.
Lenka Girmanová, Marek Šolc, Juraj Kliment, Adriana Divoková and Vojtech Mikloš
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PATIL, S. D. - Ganganallimath , M. M. - MATH, R. B. - KARIGAR, Y. 2015. Application of Six Sigma method to reduce defects in green sand casting process: A case study. In International Journal on Recent Technologies in Mechanical and Electrical Engineering, vol. 2, no. 6, pp. 37-42.
PICA, S. 2011. DMAIC and its Contribution to the Area of Process QualityImprovement within the Six Sigma Method. Master Thesis. Košice: Technical University of Košice, 83 pp. (In Slovak: DMAIC a jeho prínos v oblasti zlepšovania kvality
Drives, in Proc. IEEE Conf. Power Electron. Drives Syst. PEDS, 2005.
 SINGH, B.-BHUVANESWARI, G.-GARG, V. : Power-QualityImprovements in Vector-Controlled Induction Motor Drive Employing Pulse Multiplication in AC-DC Converters, IEEE Trans. on Power Delivery 21 No. 3 (July 2006), 1578-1586.
 SINGH, B.-BHUVANESWARI, G.-GARG, V. : 24-Pulse AC-DC Converter for Power QualityImprovement in Vector Controlled Induction Motor Drives, Electric Power Systems and Components, 34 No. 10 (Oct 2006), 1077-1098.
 SINGH, B
Paweł Lempa, Edward Lisowski, Fumito Masui, Grzegorz Filo, Michal Ptaszynski, Mariusz Domagała and Joanna Fabiś-Domagała
The article deals with the issue of quality improvement of a gear transmission by optimizing its geometry with the use of genetic algorithms. The optimization method is focused on increasing productivity and efficiency of the pump and reducing its pulsation. The best results are tested on mathematical model and automatically modelled in 3D be means of PTC Creo Software. The developed solution proved to be an effective tool in the search for better results, which greatly improved parameters of pump especially reduced flow pulsation.
Catalina Raluca Mocanu and Liviu Valentin Balanescu
To reduce the negative effects of eutrophication processes in water bodies it is necessary to improve water quality by ensuring the necessary oxygen concentration. The paper proposes a new innovative solution for the improvement of lake water quality. The premises for the implementation of the experimental floating platform which will aerate the lake waters will be presented. To give a specific view over the oxygen dispersion into the lake, numerical simulations in CFD software will be presented in different cases.
The protection of drinking water resources against pollution is a common task of outstanding importance for the water management and environment protection sectors. To prevent water supply problems arising from the short and medium-term quality deterioration of resources caused by pollution incidents, it is vital to develop methods for monitoring the quality of resources as well as methods for monitoring and predicting serious pollution events to protect water users. In the case of vulnerable drinking water resources, the establishment and maintenance of an early warning monitoring system is important. Emergency treatment technologies are also needed by the waterworks to treat the water for periods when the quality of the water has temporarily deteriorated.
Innovative solutions for the improvement of water quality consist in using a floating platform equipped with aeration systems. The equipment used to aerate the lake waters is powered by the area renewable energy (solar, wind). So, this platform can be used in isolated area, where there is no energy supply from the national network.
The analyses of the nonconformity of products are made in order to achieve the desired level of their quality. This is also the case in the analyzed enterprise located in south-eastern Poland. Due to production character in this enterprise to identify the incompatibilities of products the non-destructive tests are used. In the current approach to quality after identified the nonconformities the cause her arise were determined, it was noted in order to use by statistical analyzes. Unfortunately, no deeper qualitative analyzes were made which could specify the source of its creation. Therefore, it was considered that it is necessary to propose to use (near current actions according to non-destructive tests) the sequence of quality management instruments. In order to improve the quality control actions, the sequence of techniques which complement each other, i.e. non-destructive tests, Ishikawa diagram and 5Why method, was proposed. To demonstrate the effectiveness of the proposed sequence, the rear cover of the bearing turbine was selected as the subject of the analysis. The choice was conditioned by the unit character of production, which till now was discouraged a detailed analysis of sources of nonconformities. After analyzed the product with used the fluorescent method the nonconformities were identified on the rear cover of the bearing turbine, which was the porosity cluster. In order to identify the causes these nonconformities the Ishikawa diagram was drawn up. Next, the selected main causes (i.e. supplier of the product and nonconformities created during the production of the product) were analyzed the 5Why method in order to identify the source cause of the problem. In this case, it was the nonconformity material from the supplier. The proposed sequence, which uses the minimal resources let to show the wide range of information, which should be used to the improvement of quality. The presented the set of activities can be practised in each of the enterprises to analyze quality problems in order to identify the nonconformities and their causes.
Grzegorz Filo, Mariusz Domagała, Paweł Lempa, Joanna Fabiś-Domagała, Dominik Kwiatkowski and Hassan Momeni
This article presents results of numerical modelling, simulation and test bench experiments of a hydraulic direct-acting relief valve was used as a safety valve. The analyzed safety valve was placed in a system consisting of a fixed-speed pump, a control valve, a hydraulic cylinder as an actuator and a second pressure valve in the load line used as a payload generator for the cylinder. In the first step mathematical model of the system was formulated in the form of a system of ordinary differential equations. Next, simulation model was created in Matlab/Simulink. Simulations were carried out for different values of the actuator payload. The obtained results include time series of pressure, flow rate and displacement of the actuator piston. In order to confirm simulation results, a test bench was built and series of experiments were carried out. High compliance of simulation and laboratory results was obtained. It was confirmed that the proposed solution with the relief valve used as a safety valve fulfills its task of protecting the hydraulic system from excessive pressure increase.
Zuzana Andrássyová, Jozef Hrubec and Maria Del Carmen Bas Cerdá
Final inspection represents the last inspection operation of production line before the product reaches a customer. If nonconformities are not detected within the production process, final inspection has to ensure their detection. This contribution focuses on the final inspection results of the manufacturing process of automobile’s front seats. The outputs of final inspection are prepared by means of quality management tools (Pareto analysis). Inspection items, their changes, remedies and precautions leading to seat quality improvement are defined. The evaluation of final inspection for the following period confirms the improvement of the manufacturing process or control quality for selected inspection items.