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Optimization Criteria in End-of-Life Products Reverse Logistics Network Organisation

100%

Merkisz-Guranowska A. , Maciejewski M.

2013

tom 17

25-32

The paper discusses the problem of selection of objective function in modelling of the reverse logistics network entity location. A growing ecological awareness of societies as well as implementing concepts of manufacturer responsibility for their products result in a creation of systems of collecting and treatment of end-of-life products. Rather than being a random process a reverse logistics network should be designed as an effect of informed decisions taking into account all aspects and points of view of the stakeholders. A key issue in network design related to the use of decision support tools based on mathematical optimization is the appropriate selection of the objective function for evaluation of the potential solutions.

Analysis of Technical Parameters of Volume Transport Trailers - Towards a Sustainable Product

100%

Niewiadomski P. , Merkisz-Guranowska A.

tom Vol. 68, nr 2

16--25

This study analyses the technical parameters of volume transport trailers used in agriculture. Its fundamental goal is to present their key technical properties with specific specifications (adapted to work on medium-sized and large farms), as well as to determine the choice of manufacturers that offer sustainable products. It is assumed that the technical parameters are closely related to the proenvironmental dimension (optimization according to needs). In order to achieving the main aim, partial objectives were formulated and implemented, such as: (a) to reconstruct and interpret relevant literature and selected documents (technology sheets, production and commercial specifications, directives, standards, etc.) and to select the technical parameters which are important from the perspective of customers and suppliers; (b) to compile a list of technical parameters constituting the foundation for the analysis. These specifications became the basis for defining the appropriate direction of further research work (comparison of the technical parameters of agricultural trailers from selected manufacturers), the results of which are presented in the work. The following hypothesis was adopted prior to the research procedures: Due to market requirements and the need to adapt products to regulations, the technical parameters of agricultural trailers with similar characteristics are comparable, regardless of the manufacturer. Therefore, based on the selected parameters, it is difficult to indicate a product that best meets the key requirements of a sustainable product. It is postulated that non-technological parameters, such as brand awareness and consumer experiences resulting from the pro-environmental and social positioning of the manufacturer, should constitute features of a competitive advantage.

Assessment of disc brake vibration in rail vehicle operation on the basis of brake stand

80%

Sawczuk W. , Merkisz-Guranowska A. , Rilo Cañás A.-M.

tom Vol. 23, no. 2

221--230

The scientific aim of the article is to present the relationship between the vibroacoustic signals of the right and left friction pad during braking, depending on the mass distribution, as an element of the lever system. This article presents the results of tests of a railway disc brake in the scope of vibrations generated by pads in various states of wear located on both sides of the brake disc. The tests were carried out on the brake stand using the vibroacoustic method including the analysis of amplitudes and frequencies and the thermal imaging method. Special attention was paid to the analysis of the classic lever mechanism as a multimass system influencing the thermo-mechanical characteristics and vibrations of the pads on the right and left side of the brake disc. Uneven mass distribution of the system translates into uneven wear of the friction components. The scientific aim of this paper is to present the relation between vibroacoustic signals of the right and left friction pad during braking depending on the mass distribution of the lever system component.