Technical Transactions. Vol. 8

Technical Transactions. Vol. 8

Type: Collection of magazine numbers
Release date

Collection items (21)


Comparison of computing efficiency of different hydraulic vehicle damper models

Maniowski, Michał, Para, Slawomir
Article
2017
This paper deals with comparisons of computing efficiency of 20 damper models with functional and hybrid approaches, which can be used to solve typical problems in vehicle dynamics. Efficiency is evaluated based on model accuracy and computing time. The computed results of different damper models are compared to measurements of an actual car damper. Its damping characteristics were measured on a hydraulic damper test rig with three different excitations.

Hermite interpolation of multivariable function given at scattered points

Krowiak, Artur, Podgórski, Jordan
Article
2017
The paper shows the approach to the interpolation of scattered data which includes not only function values, but also values of derivatives of the function. To this end, an interpolant composed of radial basis functions is used and extended by terms possessing appropriate derivative terms. The latter match the given derivatives. Special attention is paid to the problem of choosing the value of the shape parameter, which is included in radial functions and influences the accuracy and stability of the solution. To validate the method, several numerical tests are carried out in the paper.

Application of Ishikawa diagram for failure analysis of a car water pump

Fabiś-Domagała, Joanna
Article
2017
The paper presents an identification of potential causes and effects of failures of a coolant pump for internal combustion engines. Ishikawa's quality improvement tools have been used to analyze the defects. The main causes of pump failures and cause-effect relationships have been identified. The main causes were identified and classified in order to select those which have the greatest influence on pump damage during operation.

An analysis of the steam superheater coil operation depending on different methods of coil support

Duda, Piotr, Felkowski, Łukasz
Article
2017
The paper presents the main types of power boiler steam superheater loads together with relevant standards applicable to superheater calculations. In the case of horizontal superheaters, due to their thermal expansion and assembly errors which are the effect of non-uniform support of the hanger tubes, extra loads are generated on the coil pipes. An FEM analysis performed for a selected superheater structure indicates that maximum stress values and the location where the stresses occur depend on the method of support of the superheater tubes. It is shown that maximum stresses in this structural element can be reduced by introducing appropriate tension of hanger bars supporting the superheater hanger tubes.

Application of Cone Beam Computed Tomography for detection of periapical lesions – clinical case

Czernilewska, Monika, Ryniewicz, Andrzej
Article
2017
The purpose of the thesis is to show the dental imaging capability of Cone Beam Computed Tomography (CBCT) in comparison with intraoral X-ray images for detection and assessment of periapical lesions before and during treatment as well as to present the use of diagnostic functions in the available software. The thesis presents two clinical cases.


Contaminants in circulating refrigerant

Skrzyniowska, Dorota
Article
2017
Contaminants are inventible in the refrigeration cycle. Lubricant, water and moist air are the main contaminants in circulated refrigerant. This paper attempts to show how the presence of such contaminants influences the thermodynamic parameters of the refrigerating cycle and the mixture, which comes at the beginning.

Environmental assessment in the integrated life cycle design of buildings

Wałach, Daniel, Sagan, Joanna, Jaskowska-Lemańska, Justyna
Article
2017
The paper discusses the issue of building environmental assessments carried out as part of an integrated life cycle design process. The paper presents the methods used to evaluate environmental impact based on CEN and ISO standards. The paper concludes with an excerpt from an environmental assessment of a reinforced concrete structural frame in an office building.

Utility assessment of biomass fly-ash for production of concrete products

Popławski, Jakub, Lelusz, Małgorzata
Article
2017
International agreements oblige our state to develop ecological sources of energy, one of which is biomass. During its combustion fly-ashes are produced. Several studies have shown that they might be useful in concrete production. The article presents a comparison of biomass fly-ash and coal fly-ash influence on the properties of cement composites. The replacement levels of cement by fly-ash (FA) were 20%, 40% and 60%. Biomass fly-ash FA(B) have replaced coal fly-ash by 0%, 50% and 100%. The compressive strength tests showed similarities in strength development of coal and biomass fly-ashes concretes. Specimens with biomass fly-ash presented similar or better abrasion resistance comparing to coal fly-ash samples.

Model for assessing “Accessibility” – the basic category in the evaluation of social performance of buildings according to standards PN-EN 16309+A1:2014-12

Orłowski, Zygmunt, Radziejowska, Aleksandra
Article
2017
The paper considers the assessment model of the category Accessibility, which is a basic element of the social aspect of sustainable construction. The model takes into account the standard PN-EN 16309+A1:2014-12, which generally provides methods and requirements for assessing the social performance of buildings. The authors, for the purposes of the model particularise the scope of the assessment category and set threshold values and the weight of particular social indicators. The model is treated as a contribution to developing a method for comprehensive assessment of the social characteristics of buildings.