Solid State Phenomena Vol. 210

Abstract: Electrically small antenna suffer from the high Q impedance such as narrow bandwidth and poor gain. To improve them, passive impedance matching is often used but it is restricted to a Bode-Fano limit. To skip it, active matching incorporating non-Foster circuits can provide a good solution. Using non-Foster theory, in this paper an active reactance circuit (ARC) design is proposed for application to electrically small antenna prototypes.

Abstract: The issue of using hydrogen as an energy source of the future raises greater and greater interest and lively discussions. Frequently, leaving aside complexity of the problem, these discussions focus exclusively on fragmentary analyses. This presentation is a description of practical and comprehensive assessment of an actual efficiency of a system using hydrogen for supplying energy in mobile arrangements of a power in the region of a dozen watts. In our discussion, emphasis was placed on the analysis of advantages and disadvantages taking into consideration all these aspects that are necessary for the correct and safe operation of the system.

Abstract: Issues concerning maintenance of power-supply for transport telematics systems were presented in this paper. Relationships graph was presented, and then Chapman–Kolmogorov system of equations was derived to describe it. Drawing on those equations, relationships for calculating function of probability of system staying in state of full ability S_PZ, state of the impendency over safety S_ZB1 and S_ZB2 as well as state of unreliability of safety S_B were derived.

Abstract: The paper presents the possibilities of application of vibroacoustic methods for monitoring and control of comfort and safety of passenger cars. It is described the WSA program for vibration signals processing. The paper presents some results of prototype experimental research and conception of the monitoring and control of comfort and safety system. The results of the WSA modules can be the input signal for the damping properties control system integrated with mechatronics system of vibration absorbing elements of suspension or engine and powertrain system mounting and springing elements.

Abstract: The paper presents the comparison of the characteristics of spring and damping components used in conventional and non-conventional automotive suspensions. The conventional suspension is based on steel coil springs and hydraulic dampers with fixed characteristics. As an example, the adaptive non-conventional suspension shows the characteristics of hydropneumatic suspension components (suspension are constantly being developed and is now based on mechatronic control systems of damping characteristics). The paper summarizes the advantages and disadvantages of these solutions.

Abstract: A typical unmanned and remotely operated platform is usually equipped with cameras which give insufficient information about the nearest environment and an operator has difficulties in driving such a platform in unknown environment. In this paper, a problem of the platform nearest area map building based on additional devices is considered. The platform is equipped with SICK LMS lasers, inclinometer and radars. Combining information from the devices allows to build a map which helps an operator to drive the platform more efficiently.

Abstract: nternal combustion engine has been in existence for a long time, but it is still in the scope of research interests and is contained in the subject matter of numerous development studies and analyses. The paper presents basic goals of research into combustion engines. A short characteristics of piston combustion engine as an object of control and adjustment was provided. It was indicated that measurements of the working medium cylinder pressure patterns could be applied to control the performance of the engine, especially the multi-fuel one. The paper presents the results of measurements of the working medium pressure patterns in the cylinder of 1.6 dm³ X16SZR engine of Opel Astra car, which was fuelled by petrol, methane, and also by methane and hydrogen blends. Substantial differences in the cylinder pressure patterns were found for the engine running on alternative fuels and on conventional fuel. An increase in the hydrogen content in the blend resulted in an increase in the maximum pressures in the engine cylinder and improvements of indicated parameters when compared with the parameters determined for the engine fuelled by pure methane.

Abstract: The paper presents problems of modeling the ships hull loaded by the shock wave associated with non-contact underwater explosion. These problems are mainly due to the rapidness of the phenomena and the need of taking into consideration that processes go on at the border of different centers (water medium-ships hull-air). The article presents analysis for describing the parameters of shock wave as well as preliminary results of virtual tests of the steel hull subjected to an impulse load.

Abstract: An increasing number of bearings in the components and units of the mechanical systems for motor vehicles is one of the many effects of the rapid growth of their technical and design advancement. Due to the nature of their responsibility, it's necessary to diagnose. The article describes the currently used methods of diagnosis workshop practice of bearings and presents own proposals based on vibroacoustic diagnostic methods.