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Standard catalysis reactors are characterized by their channel structure. There are several channels per each cm2 of the core's surface. At the same time the length of each channel exceeds 100 times the cross section size. This causes splitting of the incoming to the reactor fumes into thousand pieces. Such a construction is characterized by a Iow mechanical endurance, high flow resistance, high inertia...
Possibility of free forming for semi-finished products and giving them demanded shapes without presence of forming dies distinguish the electrodynamic method in relation to standard technologies of metal plastic working, because there are no difficulties of using punch — die instrumentations. The article presents considerations referred to prediction possibilities of final shape of pipe and flat semi-finished...
The rotary drilling of rock is widespread technology in mining and in tunnelling. The paper describes the results of research by aim to find relationships between optimal drilling and sound signal of drilling machine. The optimisation criterion has been formulated as the minimisation of specific energy with maximal effective speed of drilling in process of the rock disintegration. The research in...
The paper addresses certain aspects concerning the interaction between a cable and a magnetorheological (MR) damper. An essential difference between the displacement of the point where the damper is attached and the displacements of other points remote from the damper has been observed during experiments. The results of experimental data imply non-steady state motion of the damper piston. Twice in...
In the paper has been presented the application of the on thermodynamic analyzes and ratings oriented modeling method of power systems. Simple combustion reaction with equilibrium on the products side was taken into account. Furthermore the modeling method of simple chemical reactions has been introduced, which is based on the so-called reaction intensity coefficient, analogous to the heat exchange...
In analysis of translatory oscillatory systems the basis is a simple linear oscillator, whose mathematical treatment is well known. However, an important issue in many practical applications is the friction. This is specifically so for Iow intensity random kinematic excitation in form of acceleration, as is often the case in ground transportation. In the contribution two approaches to friction modelling...
Methods of active noise and vibration control involve different techniques which combine electroacoustics with integration of active materials and controller into a complex active structural system in order to enable radiation of an anti-phased field for cancellation or attenuation of an original noise in a specific domain. This paper presents a model-based controller design procedure for the active...
Knowledge of vibrating pattern characteristics is of interest in many applications, including minimization of noise generation in different media and design and optimization of piezoelectric transducers used in diagnostic ultrasound imaging. A field expansion technique developed for analyzing the acoustic fields and vibrating structures is presented. The technique is based on the angular spectrum...
The paper concerns the vibration control in a two-degree-of-freedom model of vehicle suspension equipped with independently controlled MR dampers in front and rear sections. The suspension model was tested in open-loop and feedback system configurations under harmonic and square base excitations. The experiments were conducted on the specially designed laboratory setup with data acquisition and control...
When designing active control systems to reduce noise radiated by vibrating surfaces, there are many variables that need to be optimised to achieve the maximum possible system performance. There are also a number of hardware and software aspects that must be considered and accounted for when a laboratory system is adapted for operation in an industrial or commercial environment. There needs to be...
The aim of the paper is to present main aspects of a research project on active noise reduction being performed at the Computer Control System Group, which is a part of the Institute of Automatic Control, Silesian University of Technology, Gliwice, Poland. In particular, the following problems are dealt with: higher order spectra in off-line and on-line identification of electro-acoustic plants for...
In the contemporary detection and target tracking units of rocket missile (RM), the control gyroscope remains an essential element being the device used for changing the position of the target line of sight (LOS). Target tracking accuracy of a rocket missile depends on the gyroscope work precision. Thus, it is necessary to examine the impact of the external actions and disturbances - rapid manoeuvres...
The paper is concerned with the experimental study of vibration control in a vehicle suspension model equipped with independently controlled magnetorheological (MR) dampers in front and rear sections of the vehicle body, and in the driver’s seat suspension. Pitch-plane suspension model with one pitch degree of freedom (DOF) and two bounce DOFs was considered. The system was tested under harmonic excitations...
An algorithm is developed for computing thermodynamic losses in the regeneration systems of the back-pressure power unit in a combined heat and power plant. Thermal measurements taken under the typical working loads were utilised to compute and analyse variability of the thermodynamic losses in heat exchangers of the high-pressure and low-pressure regeneration systems in the heating and pseudo-condensing...
The paper describes the construction and the principle of operation of a planar aerostatic two-coordinate relative base with electromagnetic drive. Stages and results of the computer simulation of the planar aerostatic two-coordinate base are presented.
Various excitation techniques have been developed to extract information on dynamic state of rotating machinery. This paper will address the effectiveness of selected excitations and analysed signals towards health monitoring of rotating machines from the shaft crack point of view. The computer simulation study is based on the uncracked and cracked Jeffcott rotor models and the efficiency of the selected...
The paper is concerned with the development and testing of a system for detection and location of overhead power lines. It was necessary to analyze the occurrence of disturbance signals affecting the operation of the system in motion and establish the effectiveness of monolithic active filters employed to reduce these disturbances.
In the paper an analysis of the influence of structural friction and piezoelectric elements on damping of torsional vibration in a shaft is presented. The structural friction between the piezoelectric actuators and the shaft is taken into account. It is assumed that the shaft is made of SMA material. A dependency describing the equivalent Kirchhoff modulus and the equivalent viscotic damping coefficient...
On the article one represented manners of the measurement of the flow with the weight-method. The main attention was concentrated on the method of the modifying dynamical weighing. Then one discussed the methodics of the design engineering of the stand for the measurement of the flow and calibrations with the method modified. The manner of the design engineering consists in the modelling and the analysis...
World known Polish scientist, physicist Professor Wojciech Rubinowicz (1889-1974) contributed immensely to the development of the theory of active methods of noise reduction. Prof. W. Rubinowicz was dealing mainly with optical phenomena, however it should be emphasised, that light waves and acoustic phenomena can be described by similar theoretical equations. Already in 1917 W. Rubinowicz developed...
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