Abstract The paper describes a design, building and testing low-cost impedance tube for measuring the acoustic parameters of small samples. measurement sound absorption coefficient is based on transfer function two microphone method in accordance with ISO 10534-2 ASTM E 1050 standards. With configuration updates after installation additional microphones apparatus complex material properties can be performed. has been used also as teaching tool.

Abstract The contribution deals with measurement of acoustic absorption coefficient for different single or double-layer materials: cork, two layers polyethylene, polyethylene and felt. was performed on an impedance tube our own construction, using the two-microphone method transfer function (ISO 10534-2: 1998) PULSE measuring system. Values frequencies from 100 Hz to 1600 were determined experimentally. Subsequently, those values processed graphically.

The friction processes as the most often physical phenomena cause many negative effects in production systems, and man try to minimize them. Coefficient of is one fundamental parameters which characterizes process between two parts, perform mutual sliding movement. Its measurement realised using experimental methods. In our experiments motion samples enforced motorically various sensors that monitor variables characterizing are used. Experimentally obtained values coefficient for bushing...

The coefficient of friction for the bronze material (CuZn25Al6) with inset graphite beds is investigated in present paper. Friction was experimentally by testing machine Tribotestor`89 which uses principle ring on method. may be classed to rotary tribometers. tested sliding pairs were same material. internal bushing performed a rotational movement constant speed ( v = 0.8 m s -1 ). external fixed exposed normal load, different sizes and variations. Process load increased from level 50 N 200...

The coefficient of friction for the bronze material (CuZn25Al6) with insert graphite beds and other (CuSn12) are investigated in this paper. Friction was experimentally by testing machine Tribotestor`89 which uses principle ring on method. external fixed bushing exposed to normal load same size all tests. Process increased from level 50 N 600 during run up 300 s, after appropriate held. internal performed a rotational movement constant sliding speed. value speed changed individually every...

Abstract The aim of the contribution is comparison noise absorption properties two designs acoustic dampening air permeable structures. A circular test samples with a diameter 89 mm and three different thicknesses were produced using 3D printing process. In addition to thickness, internal structure was also changed. prepared tested an impedance tube. investigated in accordance standards ASTM E1050-19, E2611-17 ISO 10534-2. two-microphone method based on calculation transfer function used...

Abstract The paper deals with the determination of final reliability function a complex system on model example. Three methods were used to determine function: method minimum paths, critical sections and decomposition method. MATLAB program was for calculations. article presents basic principles individual functional relationships systems. Virtual block diagrams respective are also shown all three methods. In terms calculation efficiency, seems be most suitable. It is not necessary apply...

The contribution is focused on estimating the shear modulus of samples circular and hollow sections by static method. were loaded simple torsion, individual stressed stress. Theoretical basis are determined linear elasticity strength theory they define relation between modulus, maximum stress relative strains. Relative strains using measurement apparatus system Quantum X MX 840.

Abstract This contribution is focused on determining the material properties (Young modulus and shear modulus) of testing samples. The theoretical basis for are knowledge linear elasticity strength. starting points dependencies among elasticity, modulus, normal stress relative strain. strains samples were obtained by measuring predefined load conditions using a strain-gauge bridge universal measurement system Quantum X MX 840. integration these tasks into teaching process enhances practical...

The contribution deals with measurement of the coefficient friction in sliding joint. Rotanional pair, which was tested, is described this paper. Their tribological characteristics were measured by test equipment Tribotestor`89. value for bushings from brass, aluminium and polyamide chosen load (the speed, loading, duration) are analysed largest decrease size recorded aluminium, its have decreased 87.5% during run up. Decrease about 82% brass 72% polyamide. Run up lasted 10 minutes all tests.

Abstract The paper deals with determining the final value of simple systems reliability. Simple systems, interconnections, can be divided into a sequence series and/or parallel subsystems. presents basic functional relationships used to assess reliability however, they are also essential for understanding more complex systems. graphically shows and analyzes depending on arrangement subsystems, those number

Tribometry Methods are Focused on the Research of Tribological Processes. these Method Also Include Model Tests Experimental Equipment, which Operate in Exactly-Defined Mode. Input Parameters Transparent and Easy to Maintain Constant. Outputs Variables, Recorded, Represent Characteristic Carried out Simple Test Samples. Aim is Numerically Express Magnitude Friction Force, Moment, Respectively Determinate Coefficient. Contribution Determining Coefficient for Brass Steel Measurements were...

This work deals with the modification of equipment Tribotestor. The was originally designed to measure friction coefficient sliding bearings. structural attachment node has expanded its use. now also allows parameters nodes, which consist a plane surface and cylindrical surface. Correctness this verifieded by experimental tests performed on several samples.

The contribution is focused on estimating the Young modulus of testing sample rectangular cross-section by static method.The (bar) was loaded simple bending.Theoretical basis for determining elasticity are determined linear and strength theory they define relation between modulus, maximum normal stress at edge fibers crosssection relative strains.Relative strains using measurement apparatus system Quantum X MX 840.The aim work to increase intellectual practical skills students in second...

Abstract The main goal of the paper is determination material properties from experimentally measured natural frequencies. A combination two approaches to structural dynamics testing was applied: experimental measurements frequencies were performed by Experimental Modal Analysis (EMA) and numerical simulations, carried out Finite Element (FEA). optimization methods used determine values density elasticity modulus a specimen based on results.

Abstract This paper deals with the development of equation motion and practical implementation low cost two-wheel self-balancing model a Segway transporter. The experimental cart was designed made under this study. Nonlinear equations real linearized were derived. To develop mathematical model, Matlab/Simulink applied. mechanical part implemented into Simulink, DC motor considered as linear system. tested for its balance by control algorithm consisting complementary filter PID on an Arduino...