Technical Transactions iss. 13. Mechanics iss. 2-M

Technical Transactions iss. 13. Mechanics iss. 2-M

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Release date

Collection items (10)



Vibration isolation of variable fan speed in HVAC systems

Przydróżny, Edward, Szczęśniak, Sylwia, Walaszczyk, Juliusz
Article
2014
This article analyses two samples of existing vibration isolation systems. The first sample applies to rubber absorbers, the second, to spring absorbers. The article presents a method of setting the parameters of a second order differential equation describing oscillation movement. The equation parameters were selected on the basis of amplitude measurement and rotation velocity in two representative points – (i) in the resonance and (ii) at the maximum rotation velocity when the influence of the damping factor for the oscillation amplitude can be ignored. Equations of motion simulations were performed and the results were compared with the actual values of displacement and the velocity vibration platform.

Construction of a new stand for investigating the influence of whole body vibration on man

Książek, Marek A., Tarnowski, Janusz
Article
2014
In this paper, the way of construction, adaptation and testing of a new stand for whole body vibration built on the base of a Heckert electro-hydraulic shaker was presented.

Description and analysis of the human radius bone

Książek, Marek A., Nowak, Marcin
Article
2014
The paper shows the modelling process of a 3D digital model of the human radius bone based on its external and internal geometry. The obtained numeral characteristics of the model of the chosen mathematical functions can be used for further static and dynamic analysis of the bone subjected to external forces of different magnitudes.

Stimulating technical solutions using a heuristic method

Wasilewska, Barbara, Knosala, Ryszard
Article
2014
The paper explains selected methods of stimulating innovative solutions as shown by the created model of creative problem solving. Heuristic methods allow for developing creative thinking for the development of an enterprise. Two case studies are presented using the methods typical for the studied enterprise.

Analysis of an automotive vehicle engine mount based on a squeeze-mode magnetorheological damper

Snamina, Jacek, Sapiński, Bogdan
Article
2014
Methods are outlined that can be employed to reduce the dynamic components of interaction forces between the vehicle engine and the car body, taking into account the main sources of vibration in the engine. The transmitted forces arising due to the reciprocating motion of the pistons in a two-cylinder engine are calculated. The amplitude and frequency characteristics are used to develop a method for controlling the engine mount stiffness and damping depending on the angular velocity of the crank shaft motion. The study explores the feasibility of damping control in the mount through the use of magnetorheological (MR) dampers operated in the squeeze mode.

The effect of the addition of boron on the densification, microstructure and properties of sintered 17-4 PH stainless steel

Szewczyk-Nykiel, Aneta
Article
2014
It is generally known that boron is an effective activator of the sintering process of iron as well as stainless steels. During sintering, boron contributes to the formation of a liquid phase wetting the surfaces of powder particles. As a consequence, a reduction of porosity, the rounding of pores and an increase in density is obtained. It is necessary to improve mechanical properties and corrosion resistance. The aim of this study is to investigate the effect of the addition of boron in the amounts of 0.2, 0.4 and 0.6% wt. on the density, microstructure and selected properties of sintered 17-4 PH stainless steel.

Numerical modeling of the dynamic impact of transport stretchers on patients in a moving ambulance

Nowak, Marcin, Wikłacz, Marcin
Article
2014
The paper presents numerical simulation of an ambulance transport system which consists of three elements: the stretcher, the frame which holds the stretcher and a part of the ambulance. The model was designed with the use of SolidWorks 2013 software. The numerical analysis was done with the use of ANSYS Workbench 13 software. During the first stage the natural frequencies and the forms of vibrations of the model were determined. During the second stage the dynamic excitations on the transport system were simulated.

Prototype constructions of magnetorheological dampers with energy harvesting capability

Sapiński, Bogdan, Szydło, Zbigniew
Article
2014
The paper briefly summarises the design structure of a prototype linear and rotary magnetorheological (MR) damper with energy recovery capability, engineered by the authors, and provides selected characteristics of those devices based on laboratory testing.

Evaluation of employee creativity in the context of a production accounting system

Tomczak-Horyń, Kamila, Knosala, Ryszard
Article
2014
The main goal of the modern enterprise in employee evaluation should be creativity. This article provides guidance on the criteria of creativity, which is part of the production accounting system. The paper shows the concept of measuring the creativity of employees of higher and lower levels. Also proposed a tool for measuring creativity of employees.