During the road accident analysis speed of the examined vehicle often is being established in accordance with the length of the trace remained by the vehicle tires. Usually in such case there are values of braking deceleration used for calculations, which are selected from the corresponding references. The real experiment, establishing the braking parameters of the given vehicle, is performed more seldom. In both cases it is important to calculate the vehicle speed in accordance with the received or found values of deceleration as well to estimate the possible limits of the vehicle speed, i.e. to evaluate the veracity of such calculations. This paper presents the results of evaluation of car braking parameters, which are treated as random values in the known probabilistic characteristics.
Objectives: The article analyzes the driver's psychophysiological qualities such as complex reaction and individual ability to control the vehicle that has suddenly lost its stability. The comparative analysis of the duration of reaction time was performed to assess the negative influence of speaking on a phone and driving with one hand. Material and Methods: The experimental research was carried out on special training grounds with the road surface having low adhesion coefficient, where sudden lateral vehicle destabilization was caused by the moving plate mounted on the road surface. The vehicle onboard equipment was used for identifying the difference between the destabilization moment and the responsive driver's steering wheel movement which in this research was assumed as the reaction time. Results: Statistical methods of research applied for the analysis of results showed high probability that the driver's actions would be significantly late in controlling a vehicle. When stabilizing a vehicle movement, the complex reaction time of a vehicle driver speaking on a mobile phone is increased by 18.1% as compared with the conventional driving by a driver not speaking on a phone. Conclusions: The risk of using the phone depends on the driver characteristics, traits and attitudes that affect the level of their experienced dangers, and the intensity of using mobile phones and driving. Speaking on a phone while driving increases the driver's reaction time and mental workload, and changes his or her visual overview ability as well as understanding of the situation. Int J Occup Med Environ Health 2018;31(5):633 -648
The Research on Competitiveness of Road Transport Enterprises: Lithuanian Case In the paper, various opinions of Lithuanian and foreign authors of scientific publications are reviewed and the criteria for assessing competitiveness of road transport are discussed upon. On assessment of competitiveness of services provided by Lithuanian road transport enterprises, not only technical options are taken into account. It is proposed to assess competitiveness of enterprises upon taking into consideration the total set of services provided as well as their quality and the marketing level of the enterprise. In the paper, the factors impacting competitiveness of road transport are discussed upon and the research works required for objective assessment of competitiveness of road transport are foreseen. A model for assessing competitiveness of road transport enterprises realized by the authors is provided. In the end of the paper, conclusions and recommendations are provided.
Development anD verification of a shock absorber anD its shim valve moDel baseD on the force methoD principles moDelowanie i ocena amortyzatora i jego zaworu talerzowego oparte na zasaDach metoDy sił SkAčkAuSkAS P, ŽurAuliS V, VAdlugA V, NAgurNAS S. development and verification of a shock absorber and its shim valve model based on the force method principles. Eksploatacja i Niezawodnosc -Maintenance and reliability 2017; 19 (1): 126-133, http://dx.doi.
Termiškai purkšTų dangų Tyrimas ulTragarsiniais meTodaisJustinas gargasas 1 , irmantas gedzevičius 2 , saulius nagurnas 3 Vilniaus Gedimino technikos universitetas El. paštas: 1 justinas.gargasas@vgtu.lt; 2 irmantas@vgtu.lt; 3 saulius.nagurnas@vgtu.lt santrauka. Straipsnyje pateikiami elektrolankiniu terminio purškimo būdu užpurkštų dangų tyrimai taikant ultragarsinius tyrimų metodus. Purkšta skenuojant besisukančius bandinius 30 cm/s greičiu. Atlikti dangos mikrostruktūros, ultragarsiniai storio, porėtumo, mikrokietumo ir dangos tamprumo modulio tyrimai. reikšminiai žodžiai: terminis purškimas, ultragarsiniai tyrimų metodai, mikrostruktūros, dangos mikrokietumas. research inTo Thermal sprayed coaTings wiTh ulTrasonic meThods J. gargasas, i. gedzevičius, s. nagurnas AbstractResearch on thermal sprayed coatings with ultrasonic methods is the main object of this thesis. Metal surface coating was applied to modify its mechanical and physical-chemical properties and resistance to external impact and improve aesthetics. Spraying was carried out by scanning the rotating sample of 30 cm/s speed. Surface microstructure, ultrasonic thickness, porosity, micro hardness and surface modulus tests performed. Conclusions were formulated. keywords: thermal spray, ultrasound testing, microstructure, micro hardness of coatings.
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