Wyniki wyszukiwania - BazTech

1

Refurbishing technologies of hydraulic actuators applied in mining industry

Gendarz P., Janik W.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 41, nr 1-2

104-111

EN

Purpose: of this paper: Mainly, future design and manufacturing processes should be oriented to refurbishing and overhaul, such as mining machines, hydraulics, military industry, heavy industry products, etc.. This paper shows method which can improve indirectly profitability also in environment protection area. Design/methodology/approach: Methodology that solves refurbishing and overhaul problem of application, is based on CAD/CAM integration, and predicts possibility to even prepare design for refurbishing. With help of reverse engineering techniques, also exist approach to refurbish elements that has no overhaul documentation prepared before. Findings: Preparation of overhaul documentation for families of constructions, should be computer aided with use of prepared dedicated software. Time need to prepare refurbishing technology, can be considerably reduced. Research limitations/implications: Refurbishing and overhaul in existence cycle of product should have same rights as technology or design processes. Future development of new refurbishing technologies should be prepared in software combined with CAD/CAM modules used in advanced CAE programs. Practical implications: Mining industry after possible initiate refurbishing methods, can extend exploit time of exerted machines. Simultaneously producers of mining machines and equipment, after bringing in design for refurbishing strategy in to production, can enhance economical profits from maintenance and service time prolongation. Originality/value: For last twenty years no development in area of patents were noticed. That came with increase of consumption strategy progressed by produces. Presented method solves issues of materials raise in prices and relatively short time of maintenance and service time period. New workstations in industry can be created with application of the method.

2

Computer-aided synthesis and analysis of discrete mechanical systems

Białas K.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 38, nr 2

171-178

EN

Purpose: The main objective of this study is to present and describe major properties of software that has been developed by the author himself with the purpose to support the synthesis and analysis of vibrating systems. The synthesis is the reverse task as compared to the analysis as it is intended to achieve a system that meets already assumed requirements related to the value of vibration frequency. Design/methodology/approach: The conventional approach to design complex systems is frequently time consuming and provides a guarantee that it leads to satisfying results they can never be taken for granted. Therefore, application of the other, non-conventional methods proved to be necessary, such as combined structural and parametric synthesis. As a final result of that, a method of the desired structure is obtained along with such parameters of individual system components which meet the presumed requirements. Findings: The presented software has one substantial advantage, which is the fact that no mathematical models that are used to describe the system must be defined anew when any of the system parameters or the system structure are altered. The software enables also to compare passive and active suppression of vibrations. The analyses that have been carried out with the use of the software provide a proof that application of active vibration-suppressing components leads to better results than when only passive components are used. Research limitations/implications: Scope of deliberations is limited to discrete mechanical systems that exercise longitudinal vibrations and incorporate either passive or active vibration-suppressing components, but for this type of systems, this approach is sufficient. Practical implications: The methods of reverse task and analysis can be a base of design and construction for this type of mechanic systems. Originality/value: The possibilities and operation of the author’s program supporting the synthesis and analysis of discrete mechanical systems are also discussed. By means of this software it is possible to carry out the analysis and synthesis of discrete systems containing both active and passive elements that reduce vibrations.

3

Reverse task of passive and active mechanical system in torsional vibrations

Białas K.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 35, nr 2

129-137

EN

Purpose: The main aim of this paper is to develop a method for finding structure and parameters, i.e. a structural and parameter synthesis, of an active model of a viscous damper mechanical system in vibrations. The aim is to perfect the synthesis seen as modification at the sub-assembly design level in relation to the required spectrum of vibration frequency of the system. Design/methodology/approach: With complex systems classic design is very time consuming and it does not always produce satisfactory results. Therefore, it is necessary to use other design methods, such as the inverse task, which is called synthesis. It is searching for a system structure, together with elements value, which realizes the required frequency characteristics. Findings: Using the active elements allows complete elimination of the oscillations. The conducted analysis show that it is not necessary to use both the active and passive elements, as using only active elements produces the same results. Research limitations/implications: The scope of discussion is reverse task of mechanical system in torsional vibrations including passive and active elements, but for this type of systems, such approach is sufficient. Practical implications: The methods of reverse task and analysis can be base of design and construct for this type of mechanic systems. Originality/value: Thank to the approach, introduced in this paper, can be conducted as early as during the designing of future functions of the system as well as during the construction of the system. Using method and obtained results can be value for designers of mechanical systems with elements reducing vibrations.

4

Precise formation the phase composition and the thickness of nitrided layers

Ratajski J., Olik R., Suszko T., Dobrodziej J., Michalski J., Gilewicz A.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 37, nr 2

675-689

EN

Purpose: The article presents the application of the duplex technology (nitriding plus PVD) to modification of the surface of pressure casting dies made of steel WCL (EN: X37CrMoV51). In this technology, there are clearly defined expectations regarding the properties of the surface layer of the dies obtained in the nitriding process. The main part of the article is presentation a complex system of designing, in-situ visualization and control of the gas nitriding process. Design/methodology/approach: In the conception of computer designing, analytical mathematical models and artificial intelligence methods were used. Findings: As a result, possibilities were obtained of the poly-optimization and poly-parametric simulations of the course of the process combined with a visualization of the value changes of the process parameters in the function of time, as well as possibilities to predict the properties of nitrided layers. Practical implications: Computer procedures make it possible to combine, in the duration of the process, the registered voltage and time runs with the models of the process. Originality/value: For in-situ visualization of the growth of the nitrided layer, computer procedures were developed which make use of the results of the correlations of direct and differential voltage and time runs of the process result sensor (magnetic sensor), with the proper layer growth stage.

5

Modelling of complex piezoelectric system by non-classical methods

Buchacz A., Wróbel A.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 35, nr 1

63-70

EN

Purpose: Present paper is continuation of earlier publications with stack of piezoelectric plates. This work is an author’s idea of calculations of complex systems with many elements. Design/methodology/approach: The base of calculation is matrix method and application of aggregation of graphs to determination characteristic parameters of bimorphic systems, as well as to drawing its characteristics. Findings: The analysis of complex piezoelectric system was shown to determinate characteristics of it. Research limitations/implications: In the article problem of mechatronic system analysis on example of longitudinal vibration of piezoelectric plates was presented. In the future analysis of plate with bending vibration will be done. Practical implications: Presented analysis method of piezoelectric effect in complex systems is well suited for determining the flexibility of bimorphic stack of piezoelectric plates in vibration sensors. This sensors are used to the level detection of materials. Originality/value: Thanks to the approach, introduced in this paper, analysis of bimorph system was done by means of the graph and structural numbers method.