Search Results

You are looking at 1 - 5 of 5 items for :

  • physical tests x
  • Tools and Methods x
Clear All
Open access

András Szabó

and Materials Vols. 336-338 (2013), pp. 1907-1912, ISBN:9783037857519. [12] Yanmaz, E.; Bettstetter, C., “ Channel measurements over 802.11a-based UAV-to-ground links”, GLOBECOM Workshops (GC Wkshps) IEEE , 2011, ISBN:978-1-4673-0039-1. [13] Wan, J., Suo, H., Yan, H., Liu, J., “A general test platform for cyber-physical systems:unmanned vehicle with wireless sensor network navigation”, 2011 International Conference on Advances in Engineering , http://ac.els-cdn.com/S1877705811054658/1-s2.0-S1877705811054658-main.pdf?_tid=3c747952-6b8b-11e5-bae9

Open access

Oleg Klyus and O. Bezyukov

Abstract

The paper presents the laboratory test results determining physical parameters of fuel mixture made up of petroleum diesel oil, rapeseed oil methyl esters (up to 20%) and water (up to 2.5%). The obtained parameters prove that adding bio-components (rapeseed oil methyl esters) and water to fuel does not result in deterioration of their physical and chemical properties and are comparable to base fuel parameters, namely petroleum diesel oil. The mixture was a subject of bench testing with the use of a self-ignition engine by means of pre-catalytic fuel treatment. The treatment process consisted in fuel - catalytically active material direct contact on the atomizer body. At the comparable operational parameters for the engine, the obtained exhaust gases opacity was lower up to 60% due to the preliminary fuel mixture treatment in relation to the factory-made fuel injection system using petroleum diesel oil.

Open access

Aneta Grodzicka and Jan Szlązak

Abstract

The authors of the current study undertook the subject of the analysis features of the mining rescuer as a member of the ranks of the rescue, with particular emphasis on the following parameters: heart rate, body weight, height, BMI, age and seniority in the mining and rescue. This publication concerns the analysis of the test results of these characteristics rescuer as a potential member of the ranks of the rescue, taking into account its risk appetite, stress resistance, attitude towards life, the role of the team, teamwork, attitude to work, motivation to work and physical fitness.

Open access

Stefan Berczyński, Daniel Grochała and Zenon Grządziel

Abstract

The article deals with computer-based modeling of burnishing a surface previously milled with a spherical cutter. This method of milling leaves traces, mainly asperities caused by the cutting crossfeed and cutter diameter. The burnishing process - surface plastic treatment - is accompanied by phenomena that take place right in the burnishing ball-milled surface contact zone. The authors present the method for preparing a finite element model and the methodology of tests for the assessment of height parameters of a surface geometrical structure (SGS). In the physical model the workpieces had a cuboidal shape and these dimensions: (width × height × length) 2×1×4.5 mm. As in the process of burnishing a cuboidal workpiece is affected by plastic deformations, the nonlinearities of the milled item were taken into account. The physical model of the process assumed that the burnishing ball would be rolled perpendicularly to milling cutter linear traces. The model tests included the application of three different burnishing forces: 250 N, 500 N and 1000 N. The process modeling featured the contact and pressing of a ball into the workpiece surface till the desired force was attained, then the burnishing ball was rolled along the surface section of 2 mm, and the burnishing force was gradually reduced till the ball left the contact zone. While rolling, the burnishing ball turned by a 23° angle. The cumulative diagrams depict plastic deformations of the modeled surfaces after milling and burnishing with defined force values. The roughness of idealized milled surface was calculated for the physical model under consideration, i.e. in an elementary section between profile peaks spaced at intervals of crossfeed passes, where the milling feed fwm = 0.5 mm. Also, asperities after burnishing were calculated for the same section. The differences of the obtained values fall below 20% of mean values recorded during empirical experiments. The adopted simplification in after-milling SGS modeling enables substantial acceleration of the computing process. There is a visible reduction of the Ra parameter value for milled and burnished surfaces as the burnishing force rises. The tests determined an optimal burnishing force at a level of 500 N (lowest Ra = 0.24 μm). Further increase in the value of burnishing force turned out not to affect the surface roughness, which is consistent with the results obtained from experimental studies.

Open access

Kiumars Teymourian, Dammika Seneviratne and Diego Galar

References [1] G. Colombo, D. Regazzoni and C. Rizzi, “Virtual ergonomics to design auxiliary equipment for commercial refrigeration”, in Proc. of TMCE 2012, Karlsruhe, Germany, pp. 383-392, 2012. [2] G. Li and P. Buckle, “Current techniques for assessing physical exposure to work-related musculoskeletal risks with emphasis on posturebased methods”, Ergonomics, vol. 42, no. 5, pp. 674-695, 1999. [3] D.B. Chaffin, “On simulating human reach motions for ergonomics analyses”, Human Factors and Ergonomics in