Advanced Materials Research Vol. 1036

Abstract: The paper highlights the main possibilities available when studying how the vehicles engine operate using algorithms specific to the multivariate statistics. A particular example of studying the engines behavior is represented by the diagnosis activity performed onto the vehicle, an activity that a special attention is being paid to throughout the paper. To this purpose, during the tests we have intentionally caused certain malfunctions to the engine. Circuit breakdowns were intentionally caused on various electric circuits that connect sensors and actuators to ECU. Fitting modern vehicles with electronic control systems offers the possibility for computerized approach of various maintenance operations onto its mechatronic components (sensors, actuators). These components are part of those electronic systems. Such an approach includes onboard simulation of various malfunctions that may occur during normal operation of vehicles. The procedure which is currently presented in the paper herein is about generating controlled malfunctions, using the sensors connector, a signal that is specifically varied towards the electronic control unit (ECU). Thus the ECU will interpret that the system that it is managing indicates a vehicle malfunction. .

Abstract: The aim of the paper is to demonstrate, how artificial intelligence methods, especially genetic ones, naturally combine with problems of material science. On the example of modelling a function showing how carbon concentration in steel changes its hardness it was shown how modern artificial intelligence methods can easily be adapted for solving problems of modern science. The paper presents the possibility of applying genetic programming to model properties of the steel.

Abstract: The paper presents the results of experimental and model research of powertrain system built with torsional vibration damper. The behaviour of powertrain system with and without vibration damper was shown in the conditions of acceleration and deceleration with different increases of rotational speed. Next, authors describe the process of building a mathematical model of such a system and its identification on the basis of experimental results. When examining the results obtained with empirical and model research, it has been shown that in the structural and parametric identification of model of such system, the main factor affecting the right development of the structure should be dynamic criterion, since the only use of static criteria leads to big errors. On the basis of such model we can make some structural solutions to the system to minimize torsional vibrations.

Abstract: Brittle materials belong to the group of brittle materials with a very complex structure. As heterogeneous and anisotropic materials, are randomly distributed discontinuity structures such as scratches, cracks, pores. One of the problems, which often occurs during the analysis, is to identify the properties of materials data and identify the characteristics of the impact of the tool on a brittle material. This paper presents a method of identification of material parameters and a method of modelling the contact problems for limestone Morawica. Tests and analyzes were performed for a roller compression test. Very good convergence of the results of analysis and of the results of an experiment performed on a real object was obtained.

Abstract: Composite mast with rigging system is an example of a complex composite-steel system. The implementation of modern constructional materials such as composite materials in order to construct the composite masts has some consequences. Composites have different properties than materials such as wood (in the past), steel or aluminium which are usually used in construction of the masts.

Abstract: Nowadays modern mechanical objects, above all that which are use in special purposes use the most innovative solutions that should increase their functional quality. The maintenance of those mechanical objects involves the high financial expenditures which is strictly connected with the total life cycle costs. To reduce those costs and keep up the mechanical readiness index on acceptable level the condition based maintenance strategy is more and more desirable. This is connected with the total durability of the element and its threshold value. So, in the strategy the tracking of the loss of maintenance potential of analyzed element is necessary and evaluation of the residual durability as well. In the paper, the method of life estimating the chosen element of high mobility vehicle was presented. This class of vehicle is constructed to move in various on-and off-road conditions. In many cases this vehicles play a key role in public utilities and armed forces. Very often the high mobility chassis has been used to create a special purpose vehicle. The total cost of life cycle this class of vehicles is considerable, so a method to check the loss of maintenance potential of vehicle is desirable . To solve this problem and draw up a mechanical and maintenance characteristics of a vehicles profiled ground tests have been created and various tests have been carried out . This approach have been time consuming and very expensive. What is more, results of tests are strictly connected with sort of roads selected to tests and depends on a lot of random variables. So, a worked out characteristics are statistically correct rather for the whole group of vehicle than to every single one. The proposed method is able to track the loss of maintenance potential of a critical element of every one vehicle of this class in real road condition. The method joins possibilities of calculating the load in frequency domain with fatigue strength of the most loaded points in an analyzing unit according to its FEM model. The developed method enabled to characterize relationship of decrease of maintenance potential of the critical element in terms of the type of the road and surface, and the speed of movement . The method makes it possible to forecast the residual work capacity expressed in units of time and after taking the speed of movement into consideration, also mileage expressed in kilometers.

Abstract: The article presents an analysis of impact energy dissipation process with selected non-classical dynamic models. Identification of impact energy dissipation phenomena in layered mechanical systems (for example: composite ballistic shields) is a great challenge, because on the one hand a model with parameters responsible for the energy dissipation is being sought on the one hand and on the other it is necessary to optimise the number of parameters. The sought model should be reduced to a simple description of the phenomenon and should contain a complex reproduction of the whole mechanical system. In this case the impact energy dissipation was described using selected degenerate systems. Models were treated by extortion surge having a specific impulse of force. The mathematical description of the pulse excitation was carried out using the energy and potency balance equations. The verification of mathematical identification equations was conducted using a computer simulation technique for the selected model’s parameters.

Abstract: This article includes basic information about 418V dump car. It presents most important technical data and possible applications of the wagon. It also involves main advantages and disadvantages of implicated technical solutions. Main part refers to the wall opening simulation carried out using the Siemens NX 8.5 software [4,5]. Analysis of the behaviour of mechanisms allowed to examine stages of the opening process and delivered valuable data about angular displacement of the side-board. Siemens NX 8.5 software was used in order to conduct side-boards opening simulation. Research was based on existing 3D model of 418V dump car applied into Siemens Motion Simulation module. It involved dividing model into particular elements (‘Links’), defining movement relations between them (‘Joints’), setting up a STEP function and finally creating a new solution. Research resulted in a complex side-board opening simulation. It allowed to define an angular displacement of particular, important parts. Mechanisms were proven to work safely and without any collisions between elements. Outcome of this article may be used in further research referring to the 418V dump car.

Abstract: Nowadays the surface fine finishing processes ensure, according to the quality of the initialsurface, the initial quality of the cut metal, the operating mode used for processing, the value of roughness with values between Ra = ( 0.4 .. . 0.02) μm. This leads to the reduction of the size of the layer deformed in the previous processing, and to the decrease of the micro-hollows of the resulted roughness serving as lubricant stores contributing to a decrease in the abrasion resistance of the contact surface of the cylinder. From this context it results that bearing area or rather the work area tends towards 100%. This study will present a method of plastic deforming of the inner cylindrical surface by rotary-percussion. I intend to apply this plastic deformation between the honing operation for the scalping of the heat engines cylinders and the finishing honing. The micro-hollows created by percussion will provide oil deposits to eliminate the dry friction, and their density on the cylinder surface will contribute to reducing the load-bearing work surface. The load-bearing work surface obtained with this process will be the total surface minus the surface of the concavities executed through rotary percussion. This procedure applied to the final machining operation by honing the cylindrical surfaces aims at replacing the finishing honing with lapping thus eliminating the running operation at the commissioning of the heat engine. The process has several technological and economic advantages, such as: the malleability of the metal which the cylinder is built of can be higher, the wear of the piston’s surface will decrease the effect of polishing between the piston and the cylinder , the engine will be able to work at higher speeds because the effect of lubricating the contact surfaces will be enhanced; the elimination of the running operation will decrease the cost and time of the installation parameters specified by the manufacturer, the micro-hollows are not compatible with each other so that the oil in the concavities is not blown by the burning gases before the piston passes by them.

Abstract: Work presents a proposal of mathematical algorithm used to analyse torsional vibrating systems with composite piezoelectric assemblies. In this paper systems with composite piezoelectric assemblies made of a combination of piezoelectric segments forming a ring transducer are considered. This is why such kind of transducers can be easily used in torsional vibrating systems. A mathematical model of the system was created and characteristics of the system were calculated using an approximate method. Obtained results are presented on charts and analysed. The main aim of this work is to prove that the mathematical algorithm that was presented in the previous authors works can be easily used in order to analyse systems with new, advanced and non-classical piezoelectric transducers.