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1
Content available remote Application of mechanical and electrical elements in reduction of vibration
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
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2012
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Vol. 52, nr 1
31--38
EN
Purpose: This work presents methods of reduction of the vibration of mechanical systems by means of passive and active elements as well as examples of implementation of active reduction of vibration by means of electrical elements and mechanical elements in the form of kinematic excitation. Design/methodology/approach: This work also describes a structural and parametric synthesis, which can be defined as the design of systems meeting specific requirements. These requirements refer to the frequency values of the systems’ vibration. Findings: The examples of implementation of active subsystems presented in this work point out to the fact that one can use mechanical elements as well as electrical elements to reduce mechanical vibration. By applying such elements it is possible to obtain mechanical energy necessary for the active reduction of vibration. Research limitations/implications: The deliberations presented in this paper are limited to the presentation of possible physical implementation of active elements by means of mechanical and electrical elements. In active subsystems one may also use elements from other environments. In the next phase one should analyse the resultant systems and investigate the interaction between the subsystems and the basic system. Practical implications: The results represented this work extend the tasks of synthesis to other spheres of science. The practical realization of the reverse task of dynamics introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. Originality/value: The presented approach i.e. a non-classical synthetic method applied in designing mechanical systems, one (as early as at the design and construction stage) may verify future systems.
2
Content available remote Computer-aided analysis and synthesis of branched mechanical systems
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
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2011
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Vol. 45, nr 1
39--44
EN
Purpose: The main aim is to present and describe the author’s program supporting the process of analysis and synthesis of discrete vibrating mechanical systems with branched structures. Synthesis of reference concerns the reverse problem and is aimed to obtain the structure and parameters of the system that meets the previously established requirements for the values of vibrations frequencies. Design/methodology/approach: Using the program presented in this paper, it is possible to carry out the synthesis that is understood as designing of the systems. The use of such non-classical method significantly reduces designing time compared to classical methods. An important advantage of the program is a lack of need for the formulation of new mathematical models used to describe the system, with the change of its parameters or structure. The program also facilitates comparison of the passive and active vibration reduction. Findings: The presented software allows comparison of the results of the use of passive and active elements of vibration reduction of the systems under consideration. The analysis shows that active elements reduce the vibration completely and passive elements reduce the vibrations only partially. Research limitations/implications: The scope of considerations is limited to discrete longitudinal vibrating mechanical systems with branched structures containing passive or active elements for reduction of vibrations. Practical implications: The presented methods of synthesis and analysis can be useful for designers and engineers in the design and construction of this type of mechanical systems. Originality/value: The possibilities and operation of the author’s program aiding 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
Content available remote Application of kinematic excitation as implementation of active reduction of vibration
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
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2011
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Vol. 47, nr 2
185--194
EN
Purpose: The work presents methods of reducing vibration with the use of passive and active elements as well as reveals the results of implementation of active reduction of vibration applying mechanical elements in the form of kinematic excitation. Design/methodology/approach: The publication also includes structural and parametric synthesis understood as designing of mechanical systems with a desired frequency spectrum and presents analysis of obtained systems in order to verify if the latter meet related requirements. Findings: The research reveals that the application of kinematic excitation as the implementation of active reduction of vibration does not satisfy expectations as obtained models are characterised by frequency spectrum different to the desired one. Research limitations/implications: The research relates only to discrete vibratory systems, in which the reduction is carried out by means of mechanical elements. It is advisable to apply another type of elements e.g. electric ones. Practical implications: The results represented this work extend the tasks of synthesis to other spheres of science e.g. electric systems. The practical realization of the reverse task of dynamics introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. Originality/value: Owing to the presented approach i.e. a non-classical synthetic method applied in designing mechanical systems, one (as early as at the design and construction stage) may verify future systems.
4
Content available remote FEM applications to model friction processes in plastic strain conditions
Lenik K., Korga S.
Archives of Materials Science and Engineering
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2010
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Vol. 41, nr 2
121-124
EN
Purpose: The analysis of FEM applications to evaluate stress states in investigated tribologic processes of plastic working in a special tribological device designed for the purpose of this research. Design/methodology/approach: The analysis and modeling of upsetting processes in movement conditions by means of FEM. Findings: The paper presents the application of FEM and its methodology of computations for the established friction conditions in real conditions and in virtual conditions. The common properties and differing ones for both methods have been described. Research limitations/implications: The research on the carried upsetting process in movement conditions makes possible to determine the effectiveness of applied methodology of investigation. Practical implications: Finite Element Method can be successfully used as a tool to examine plastic strain phenomena at considerations of different working conditions of particular elements. Originality/value: The use of a special instrument for friction tests and of FEM to evaluate friction processes in plastic strain conditions.
5
Content available remote Synthesis of mechanical systems including passive or active elements
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
|
2008
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Vol. 26, nr 1
18-25
EN
Purpose: In this paper there are presented basic methods of synthesis of mechanical systems including active and passive elements. The major aim of the research is to work out a method of structure and parameters searching i.e. structural and parametric synthesis of a discrete model of mechanical system on the base of desired requirements. The requirements pertain to dynamic features of the system, particularly its frequency spectrum. The purpose of this paper is also comparison of reduction of vibrations of mechanical systems by use the passive or active elements. Design/methodology/approach: In this article was used unclassical method of polar graphs and their relationship with the algebra of structural numbers. This method enables analysis without limitations depending on kind and number of elements of complex mechanical system using electronic calculation technique. Findings: Use of active elements into the elimination of vibration offers the possibility to overcome the limitations of the methods of passive elimination of vibration, such as, in particular, low efficiency in case of low-frequency vibration. Research limitations/implications: The scope of discussion is synthesis of passive and active mechanical systems, but for this type of systems, such approach is sufficient. Practical implications: The results represented this work in form of polar graphs extend the tasks of synthesis to other spheres of science e.g. electric systems. The practical realization of the reverse task of dynamics introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. Originality/value: Thank to use an unclassic method of polar graphs and their relationship with the algebra of structural numbers, can be possible correcting systems as early as during the designing of future functions of the system as well as during the construction of the system.
6
Content available remote Polar graphs and structural numbers in synthesis of active and passive mechanical systems
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
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2008
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Vol. 30, nr 1
43-50
EN
Purpose: The main purpose of this work is the presentation analysis and synthesis of mechanical systems including passive and active elements reducing vibrations. In result of conducted synthesis was received structures and parameters of a discrete model meeting the defined requirements concerning the dynamic features of the system, in particular, the frequency spectrum. The aim of this paper is also comparison of these two methods of reduction of vibrations. Design/methodology/approach: In this paper was used method of polar graphs and their relationship with algebra of structural numbers. This method is called a non-classical method. The use of such a method enables the analysis and synthesis of mechanical systems irrespective of the type and number of the elements of such a system. Findings: The application of active elements to eliminate vibration enables overcoming limitations which occur if passive elements are used. Active elements give better results in case of reduction of low frequency vibrations. Presented approach simplifies the process of selecting the dynamical parameters of systems in view of their dynamical characteristics. Research limitations/implications: The scope of discussion is analysis and synthesis of mechanical systems including passive and active elements reducing of vibrations, but for this type of systems, such approach is sufficient. Practical implications: The practical realization of the reverse task of dynamics introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. 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.
7
Content available remote Graphs and structural numbers in analysis and synthesis of mechanical systems
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
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2008
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Vol. 29, nr 2
151-154
EN
Purpose: The main purpose of this work is the introduction the algorithm of a analysis and synthesis of mechanical systems. The systems containing passive and active elements reducing of vibrations. In result of conducted synthesis was received structures and parameters of a discrete model meeting the defined requirements concerning the dynamic features of the system, in particular, the frequency spectrum. Design/methodology/approach: In this paper was used a non-classical method of polar graphs and their relationship with algebra of structural numbers. The use of such a method enables the analysis and synthesis of mechanical systems irrespective of the type and number of the elements of such a system. Findings: Presented approach simplifies the process of selecting the dynamical parameters of systems in view of their dynamical characteristics. The application of active elements to eliminate vibration enables overcoming limitations which occur if passive elements are used. Research limitations/implications: The scope of discussion is analysis and synthesis of passive and active mechanical systems, but for this type of systems, such approach is sufficient. Practical implications: The practical realization of the analysis and synthesis introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. Originality/value: Thank to the approach, introduced in this work, 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.
8
Content available remote Synthesis of mechanical systems including passive or active elements reducing of vibrations
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
|
Vol. 20, nr 1-2
323-326
EN
Purpose: In this work there is presented basic method of synthesis of active and passive mechanical systems realization. The principal aim of the research is to work out a method of structure and parameters searching i.e. structural and parametric synthesis of a discrete model of mechanical system on the base of desired requirements. The requirements refer to dynamic features of the system, particularly its frequency spectrum. The purpose of this paper is also comparison of reduction of vibrations in mechanical systems by use the passive and active elements. Design/methodology/approach: In this work used unclassical method of polar graphs and their relationship with algebra of structural numbers. This method enables analysis without limitations depending on kind and number of elements of complex mechanical system using electronic calculation technique. Findings: Use of active elements into the elimination of vibration offers the possibility to overcome the limitations of the methods of passive elimination of vibration, such as, in particular, low efficiency in case of low-frequency vibration. Practical implications: The results represented this work in form of polar graphs extend the tasks of synthesis to other spheres of science e.g. electric systems. The practical realization of the reverse task of dynamics introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. Originality/value: Thank to the approach, an unclassical method of polar graphs and their relationship with the algebra of structural numbers, can be conducted as early as during the designing of future functions of the system as well as during the construction of the system.
9
Content available remote Reverse task of passive and active mechanical systems
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
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Vol. 23, nr 2
51-54
EN
Purpose: The main purpose of this work is to present the algorithm of a converse problem of dynamics of mechanical systems containing passive and active elements. Solving the problem results in obtaining structures and parameters of a discrete model meeting the defined requirements concerning the dynamic features of the system, in particular, the frequency spectrum. Another objective of this work is to compare the reduction of vibration by means of passive or active elements or while using passive and active elements at the same time. Design/methodology/approach: The work involves the application of a non-classical method of polar graphs and their relation to structural algebra. The use of such a method enables the analysis of mechanical systems irrespective of the type and number of the elements of such a system. Findings: The application of active elements to eliminate vibration enables overcoming limitations which occur if passive elements are used. One of the most important limitations is low efficiency in case of low-frequency vibration and inability to reduce vibration of selected parts of the system. Research limitations/implications: The scope of discussion is reverse task of passive and active mechanical systems, but for this type of systems, such approach is sufficient. Practical implications: The practical realization of the reverse task of dynamics introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. Originality/value: Thank to the approach, unclassical method of polar graphs and their relationship with algebra of structural numbers, 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.
10
Content available remote Comparison of methods of reduction of vibrations
Białas K.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
|
Vol. 25, nr 1
87-94
EN
Purpose: In this work there are presented basic methods of reverse task of active and passive mechanical systems realization. The principal aim of the research taken is to work out a method of structure and parameters searching i.e. structural and parametric synthesis of discrete model of mechanical system on the base of desired requirements. The requirements refer to dynamic features of the system, particularly their frequency spectrum. Purpose of work is also comparison of active and passive method reduction of vibrations. Design/methodology/approach: In this work used unclassical method of polar graphs and their relationship with algebra of structural numbers. This method enables analysis without limitations depending on kind and number of elements of complex mechanical system using electronic calculation technique. Using method makes also possible designing systems including active or passive elements reducing of vibrations. Findings: Introduced in this paper approach adopted makes it possible to undertake actions aiming at the elimination of phenomena resulting in the unwanted operation of machinery or generation of hazardous situations in the machinery environment. Practical implications: The results represented this work in form of polar graphs extend the tasks of synthesis to other spheres of science e.g. electric systems. The practical realization of the reverse task of dynamics introduced in this work can find uses in designing of machines with active and passive elements with the required frequency spectrum. Originality/value: Thank to the approach, unclassical method of polar graphs and their relationship with algebra of structural numbers, 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.
11
Content available remote Application of the “Mathematica” System to Solving Small Vibration Problem of the Multi Degree of Freedom Mechanical Systems
Drzewiecki A., Starosta R., Kołat P.
Vibrations in Physical Systems
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2004
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Vol. 21
143--146
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