Testing polymer rollers memory in the context of passenger lift car comfort

The article presents the authors’ own studies on the application of polymer materials with different physical and chemical properties for vibro-insulation of lifting appliances. The studies were performed on a static test stand, which was made as part of works on the examined polymers, as well as on a dynamic test stand. We analyzed the effect of various polymer materials upon the phenomenon of susceptibility and possibility of returning to primary shape after the load disappears. We determined susceptibility characteristics for examined polyurethane materials. Study results are important from the point of view of improving the comfort and operation of lifting appliances

IMPACT-BASED PIEZOELECTRIC ENERGY HARVESTING SYSTEM EXCITED FROM DIESEL ENGINE SUSPENSION

Vibration energy harvesting systems are using real ambient sources of vibration excitation. In our paper, we study the dynamical voltage response of the piezoelectric vibrational energy harvesting system (PVEHs) with a mechanical resonator possessing an amplitude limiter. The PVEHs consist of the cantilever beam with a piezoelectric patch. The proposed system was subjected to the inertial excitation from the engine suspension. Impacts of the beam resonator are useful to increase of system’s frequency transition band. The suitable simulations of the resonator and piezoelectric transducer are performed by using measured signal from the engine suspension. Voltage outputs of linear (without amplitude limiter) and nonlinear harvesters were compared indicating better efficiency of the nonlinear design

COMPARATIVE STUDY OF SELECTED LUBRICATING PROPERTIES OF BIOFUELS

ABSTRACT The paper presents the research results of lubricity of selected vegetable oils, rapeseed oil methyl esters, and esters with addition of oleic acid. Higher wear of samples during lubrication by rapeseed oil methyl esters in comparison to the tested vegetable oils was obtained. The addition of oleic acid to esters resulted in the improvement of their lubricating properties

COMPARATIVE STUDY OF SELECTED LUBRICATING PROPERTIES OF BIOFUELS

The paper presents the research results of lubricity of selected vegetable oils, rapeseed oil methyl esters, and esters with addition of oleic acid. Higher wear of samples during lubrication by rapeseed oil methyl esters in comparison to the tested vegetable oils was obtained. The addition of oleic acid to esters resulted in the improvement of their lubricating properties

Research on lubrication properties of selected raw plant and animal materials

The article presents the results of research on lubrication properties of rapeseed oil, methyl esters of rapeseed oil, as well as esters with goose fat. Rapeseed oil has a better lubrication properties in relation to methyl esters of rapeseed oil. Addition of goose fat to esters negatively affected their lubrication properties. The presented results confirm a relationship between the degree of unsaturated and lubricated properties. Among the tested compounds with oxygen groups (COOH, COOCH3, C = O), the oleic acid (with a COOH group) characterised the best lubricity. The fat goose, which contains the least amount of unsaturated fatty acid esters, proved to be ineffective addition lubricity between the factor lubricants analysis

EVACUATION SYSTEMS OF SCREW-TYPE WATER TURBINES IN SMALL HYDROPOWER PLANT

This paper presents evacuation solutions of hydroelectric power set applied in a screw-type turbine in Small Hydropower Plant (SHP). The article compares the solutions applied in Poland and other European countries in the yield of green energy from the water sector. Innovative solutions of the turbine safety problem in hydro building development in case of flood waters of rivers in Poland

Testing of lubricating properties of mixtures of diesel and RME biofuels with the addition of linoleic acid

In connection with the limited resources of fossil fuels and the reduction of emissions and stimulation of agricultural areas, a very important indication is the search for alternative fuels – biofuels. The article presents the results of testing the lubricating properties of selected fuel mixtures. The lubricity of diesel fuel (DF), DF with 7% content of methyl esters of rapeseed oil fatty acids (RME), technical linoleic acid and DF with 7% content of RME and 10% content of technical linoleic acid was tested. The research was carried out on the author's research stand in the amount of 20 dm3 of mixture. Four parameters were taken into account: mass loss of samples, the footprint area of cooperation, diameter of equivalent wheel and average value of the coefficient of friction. It has been shown that the addition of linoleic acid to diesel fuel containing RME causes a significant increase in the mass loss of the samples and the footprint area of cooperation as well as its diameter of equivalent wheel, during lubrication with such a mixture. As a result of the addition of linoleic acid, no positive results were obtained, as the lubricating properties in this case deteriorated. Therefore, it is justified to continue looking for fuel additives that will eliminate this negative effect

RESEARCH OF COMPOSITE MATERIALS USED IN THE CONSTRUCTION OF VEHICLE BODYWORK

Contemporary vehicles have more and more elements of the bodywork made of composites. The advantages are undoubtedly weight reduction and increased corrosion resistance. On the other hand, accidental repairs are becoming difficult, however, in case of minor deformation there is often no permanent deformation. The authors have asked themselves how the strength of composite bodyworks varies over time and in case of minor accidental damage, qualifying the element for further use. The paper presents the results of research on the structure and strength of composite body elements of selected vehicles. Undamaged components and plating parts that were damaged during the collision were examined

A Model-Based Approach for Setting the Initial Angle of the Drive Axles in a 4 × 4 High Mobility Wheeled Vehicle

This article presents an analysis of the driveline operation of a high-mobility Jelcz 442.32 wheeled vehicle, which uses rigid drive axles connected to drive shafts with two universal joints (another name for the Cardan joints) due to the occurrence of kinematic incompatibility. The conditions for the correct connection of the drive shafts with two universal joints (Cardan joints) were presented, and the kinematic ratio of the complete drive shaft was defined. In the analysis of kinematic incompatibility regarding (but not limited to) the method of loading the vehicle, selected characteristic conditions of vehicle movement and the initial values of the angular setting of the rigid driving axles in relation to the vehicle body were presented. It has been shown that, in the analyzed vehicle, the kinematic incompatibility in the driveline is constantly present, and the value of this incompatibility, represented by the temporary ratio of drive shafts, depends on, among other things, the ways of loading the vehicle, the existing conditions of vehicle movement, and the type of ground. Moreover, the value of the arising kinematic incompatibility was noticed to be highly influenced by the correct manufacturing and assembly of the vehicle springs

Possibility of Increasing Vehicle Energy Balance Using Coasting

The paper deals with coasting as an option of using the vehicle kinetic energy. It highlights the need for changes in the legislation in conjunction with the use of new trends in the management of motor vehicles with regard to safety. The article describes the use of the vehicle is coasting as part of the driving mode, which leads to the reduction in fuel consumption and in exhaust emission. This solution takes into account all the running resistances and creates a basis for designing appropriate control strategies. These options were analyzed with respect to various drive strategies and kinds of transport