The adverse effects of vibrations on the performance of machines and their environment are the subject of various studies. That is why already in the machine design stage the designers have to face the problem of preventing undesirable effects in the functioning of new machines as well as adapting complete machines to the requirements resulting from the current knowledge on hazards caused by these machines. There are a number of methods for preventing excessive vibrations, which have an impact on machine sub-assemblies and elements. In particular, the passive, semi-active and active vibration-reducing systems can be distinguished [4,5].

Presented research highlights possibility of application of additional active absorbers to mechatronic discrete structures for vibration isolation, in relation to requirements in form of poles and zeros. This new function is defined and compared with semi-active configuration of mechatronic systems that can be obtained by LC or LRC control in external electric network with negative capacitance. Basing on selected examples and types of considered displacement models received from synthesis, respective parameters responsible for damping functions have been investigated. Comparing frequency response functions and dynamical flexibilities, active and semiactive vibration isolation methods have been confronted with regards to damping performance.

This work presents methods of reduction of the vibration of mechanical systems by means of active elements as well as examples of implementation of active reduction of vibration by means of electrical elements [. 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. 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 [1-. This work presents the description of vibration reduction methods. The most popular methods are passive, active and semi-active. An important aspect of this work is the presentation of several possibilities of the physical implementation of active subsystems. In examples active subsystems consisted of the following electric elements is coil with a movable core. In this work is presents influence of electrical subsystem to basic mechanical system. Designer should analyse the resultant systems and investigate the interaction between the subsystems and the basic system [4-.

The structural and parametric analysis presented in this work is understood as an inverse task of dynamics. The solution to this task is to obtain structure and parameters of a system meeting initial requirements. This synthesis may be used as a non-classical method of designing mechanical systems [1÷7]. The presented work extends this issue. Apart from designing a system consisting solely of passive elements, it also describes a subsystem, whose operation reduces undesired vibration of the primary system. The basic analysis which will be performed is to test the influence of applying electric elements on the primary mechanical set [1,3,6]. The analysis will be done on the example of system which were obtained while conducting the structural and parametric synthesis. In order to design a system including an active subsystem in the form of electric elements reducing vibration by means of a non-classical method of designing.

This paper presents an analysis of mechanical systems with the discrete-continuous distribution of parameters performing small vibrations around the adopted state of equilibrium. The modelling and analysis of discretecontinuous vibration systems with conjugations using the non-classical method is a more general approach as compared to modelling and analysis in classical terms. The method presented in this article permits a simplification and facilitates the understanding of mechanical vibrations in such class of systems.

The main objective of this work is to present a reverse task of the dynamics of discrete vibratory mechanical systems. This task is reverse to analysis and is called structural and parametric synthesis. As a result of performing the synthesis one obtains a structure and values of individual parameters of the system of required properties. Such properties refer to the determination of individual frequencies of the system vibration. Synthesis is divided into two stages. The first stage consists in definition of the structure as well as the values of parameters of a passive system without vibration reduction. In the second phase, one selects a method of vibration reduction as well as system structure and parameters with vibration-reducing elements. In case of already-existing systems, the first stage consists in the identification of the system and its analysis. There are no changes in the second stage (Figure 1) [. Another objective of this work is to use mechanical elements in the form of kinematic excitations as the implementation of active reduction of vibration as well as to check the influence of this subsystem on the basic system. The application of the synthesis presented in this work enables the correction of the already-existing machines and devices as well as the modification of newly-created systems with the view of their future functioning.