Trans Motauto World
Vol. 2 (2017), Issue 6

Table of Contents

  • TRANSPORT TECHNICS. INVESTIGATION OF ELEMENTS. RELIABILITY

    • UNDERWATER HULL OBSERVATION SYSTEM ARMUS

      pg(s) 215-218

      The ARMUS system presents a new approach for observation of the hull of large marine vessels providing fast, but at the same time very accurate and reliable method for underwater inspection, detection and identification of various threats. ARMUS is magnetic tracks based mobile robot capable to stick-on and move along iron surfaces and operate in extreme environmental conditions, including under the water surface. Among the main advantages of the ARMUS system is its ability to reduce significantly the time for hull inspection by providing in process estimation and assessment of the hull while the ship is in motion. This advantage reduces significantly the standby time of the ships when inspection of the hull is required before entering a port. On other hand the in process inspection allows the vessels to be observed continuously during the voyage. Another important advantage of ARMUS is its capability to stay underwater as long as it is necessary. The system is powered and controlled directly by the vessel it inspects and may operate in long cycles without maintenance and recharge.

    • IMPACT OF PARAMETERS OF POWER TRANSMISSION SYSTEM STATE ON VEHICLE’S WORKING LIFE AND POWER EFFICIENCY

      pg(s) 219-222

      This paper deals with a change of states of power transmission system elements up to the achievement of boundary conditions based on a material fatigue. Depending on the level of change in states of elements, an estimation of a remaining working life of a power transmission system was given. Additionally, an estimation of a change of conditions of power transmission system elements , as well as the impact of states of elements on a power efficiency of a vehicle are presented . Besides an analytical consideration, the simulation models were created and the results of simulations presented.

    • ANALYSIS AND MODELLING OF AUTOMOTIVE AIR FILTER AS A SUBSTITUTE FOR POWERCORE ITEM

      pg(s) 223-226

      Analysis of PowerCore automotive air filter was made and development of new alternative air filter was performed by increasing surface area of filtering material. New shape of construction of air filter was suggested by introducing double-layer filtering material. It was determined that effective surface area of the new design of air filter was increased 1.5 times comparing with the patented PowerCore item of the same size. Efficiency and strength of the new design air filter was evaluated calculating air flux rates, deformations and displacement in SolidWorks environment.

    • DESIGN AND OPTIMISATION OF 2DOF VEHICLE SUSPENSION SYSTEM

      pg(s) 227-229

      In this paper is presented the optimal design of quarter car vehicle suspensions. During the optimisation the three design criteria which have been used are; vertical vehicle body acceleration, dynamic tire load and suspension working space. For implementing a optimization a comparison of two optimisation algorithms: Sequential Quadratic Program (SQP) and Genetic Algorithms (GAs). will be chosen five design parameters: sprung and un-sprung mass, spring stiffness, damping coefficient and tire stiffness. Through the simulation in Matlab it will be shown that GA is more powerful tool to find the global optimal point, without any restrictive requirements on the gradient and Hessian Matrix, while SQP has local convergence properties. The main focus of this research will be on minimising the vertical vehicle body acceleration subjected to a suspension working space and the dynamic tire load. At the end of this paper, it will be shown the comparison between the simulation carried out with nominal and optimal values of design parameters.

    • THE STRESS VARIATION BY CHANGING THE SUPPORTING POINT LOCATION IN THE MOTOR VEHICLE CLUTCH ASSEMBLEY

      pg(s) 230-234

      The diaphragm spring as one of the most important parts of the motor vehicles clutch assembly provides the compressive force on the pressure disk. This force is needed for generating friction between the coupling of the flywheel and the pressure disk and transmitting the torque from the engine to the transmission. Therefore the diaphragm spring is subjected to complex loads. The nominal stress for dimensioning the spring is the tangential stress, which is calculated by the terms of Almen and Laszlo. The aim of this research is analyzing the location of the diaphragm spring supporting points of the clutch assembly and its effect on the caused stresses by using the Finite Element Method.

    • RESEARCH AND ANALYSIS OF DYNAMIC PARAMETERS IN V-BELTS

      pg(s) 235-237

      In this work is presented research about main dynamic parameters that have influence in the efficiency of trapezoid belts (VBelts). Research is done in the testing machine with 3 wheels. Two main parameters analyzed are important dynamic parameters: Force of preliminary belt tightening (Fpr), and Coefficient of elastic slipping (Kes). Last coefficient is important factor for dynamic analysis of belt transporters while it defines clearly level of carrying capacity vs. defined force of preliminary belt tightening. Through laboratory testing has been researched influence of power that is transmitted and force of preliminary tightening in the coefficient of elastic slipping, with the aim to determine optimal limit of this coefficient. In practice it is recommended that values of this coefficient not to be higher than 2%.

  • TRANSPORT. SAFETY AND ECOLOGY. LOGISTICS AND MANAGEMENT

    • METHODICAL ASPECTS OF DETERMINING THE PROFITABILITY OF THE RAILWAY ROLLING STOCK OPERATOR

      pg(s) 238-240

      This article analyzes and comparison of the various scientific and methodological approaches to determining the profitability of rolling stock operated by operating companies. We consider four different methods of profitability calculation, carried out their comparison revealed the advantages and disadvantages of each method. Recommendations on the field of application of each method.

    • CONCENTRATION IN LINER SHIPPING AND ALLIANCES FORMATION: ISSUES AND CHALLENGES

      pg(s) 241-244

      The present article analyses the present status of the container liner shipping and its market concentration. The forming of strategic alliances is considered in detail against the other forms of market cooperation. The specifics of strategic alliances in liner shipping is outlined, the latter being one of the drivers for operational and strategic efficiency of liner services. The results show that there has been a significant increase of market concentration as from 2014. The formation of strategic alliances ensures for lower operational costs although leading to, in the short-run, overcapacity and increased internal competition. From a long-term perspective, the formation of strategic alliances will lead to increased market concentration and, eventually, to more stable shipping markets and decreased competition.