This paper presents the consideration of the individual processes of interaction of modular wheels with the road by establishing the relationships between them, as well as with the machine as a whole. In particular, this concerns the redistribution of tractive forces on the wheels of machines in assessing their patency and efficiency.
A new design of Mi-8/Mi-17 helicopter’s main reducer with a higher technical level and built on the basis of the kinematic scheme of the three—stage double-flow reducer AN is being considered. At the same time the requirements for the reducer to be multi-flow and to have the required kinematic parameters at all of its output shafts for driving the main and tail rotors and all the auxiliary units are being observed.
The article provides an analysis of the excitation conditions and the results of the detuning of parametric resonance in mechanical drive amphibious water-jet machines. The paper substantiates the possibility of solving the problem of reducing the dynamic load on the basis of the synthesis filter low-frequency vibrations.
There are viewed the following types of asymmetry: mass, linear and asymmetry of fixing points of big elastic elements to the spacecraft’ body. There is shown increase of the microacceleration module while asymmetry of the mentioned types appears. The conclusions about importance of geometrical symmetry of space laboratory for successful realization of gravity-sensitive technological processes on its board were made.
The car brake system performance has to be reliable at wide range of operating conditions. The friction based braking system reliability strongly depends on cooling capability of disc. According to this, different testing is needed to assure the performance of discs during their design and prototyping phase. The contribution presents the study of cooling capacity of different vented brake disc geometries.
Brake disc temperatures during thermal capacity test can exceed 600 C. The temperatures are highly dependent on disc cooling capability. Vented disc have higher cooling capability. There is an open issue which factor has the most significant impact. Is it air flow, air flow distribution, turbulence or …? Brake discs with the same external geometry but different internal geometry were tested on brake dynamometer and subsequently air flow parameters were analysed in cold condition to attempt to explain different maximum temperatures.
The main issues are considered in this topic: the new logistic schemes for passenger transportation between Europe and Ukraine; the developing an integrated short-term planning system for the purpose of interaction between passengers and carriers; the intermodal transportation of passengers.
This research relates to air transport security and includes studies aimed at improving systems to ensure an acceptable level of transport security by solving technical challenges in the field of adaptive incident management.
Relations are developed estimating risks of in-transit uncoupling of cars caused by technical malfunction depending on the number of cars in a train and haulage distance. The obtained results allow assessing safety level in international transit corridors where each local railway administration shares liability for damage to cargo and railway equipment in the course of transportation through their area of responsibility.
Elevating work platforms are used for work in places that are not easily accessible, and with their design and subsequently appropriate design craftsmanship they ensure safe work in construction and assembly operations, inspections of street lighting and many other activities. The mobile elevating work platforms that are manufactured today, with their level of construction, quality of workmanship and ever-improving built-in safety features, create safer working conditions at heights and thus a quieter and safer working environment not only for the workers themselves but also for their employers. The paper analyzes the dangers and threats when working with platforms and the requirements for operators working with this equipment. Subsequently, risks are identified using the risk-assessment methods in the standards TNI ISO / TR 14121-2 Safety of Machinery. Risk assessment. Part 2: Practical guidance and examples of methods. In the conclusion is a proposal of corrective measures that can improve safety when working with elevating work platforms.
Based on the analysis of the mathematical model of the motor grader movement in the process of implementation of working operations, the factors that have the greatest influence on formation of the machine’s motion path are identified. It is proved that some of the factors characterizing the parameters of the machine and technological process have a destabilizing impact on the formation of the grader motion path, while the rest of them have a stabilizing impact. The analytical research enables developing practical recommendations to ensure the movement of the machine along a predetermined path without deviations.
The energy crisis and environmental contamination are two of the main problems of the 21st century. Atmospheric contamination from transport is well-studied case of environmental impact and is associated with significant health consequences. The biofuels use is able to reduce both pollution emitted by transport (CO2 and other damaging substances into the atmosphere, contributing to global warming) and the reduction of energy dependence on fossil fuels (gasoline, diesel, etc.). European Union requires their use to reach – 10% by 2020. Object of our study is bioethanol, which has great potential to replace gasoline. It was discussed the environmental technique for analyzing and managing the production of bioethanol, aiming to explore all stages of the production chain. It includes a selection of feedstock, site of its cultivation and transport, area for the construction of biorefinery, technology for production and distribution.
For the analyzed LNG carrier with Rankine regenerative feed water cycle, energy analysis is presented. The intention was to determine auxiliary flow streams from the useful ones. Auxiliary energy flow supports plant operation on the one side, but reduces overall efficiency on the other. Steam generators energy streams are divided into two major groups, for the main and auxiliary stream consumers. The steam system test was performed by varying main propulsion shaft revolutions. The required thermodynamic data are collected at various steam system locations. For considered plant energy flow streams components are explained and analyzed. In this paper the recommendations for possible energy savings for the mentioned propulsion plant are proposed.