Wyniki wyszukiwania - BazTech

1

Badanie wpływu pracy maszyn na drgania konstrukcji wsporczej w hali produkcyjno-magazynowej

Grosel Jacek, Pakos Wojciech

Przegląd Budowlany

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2025

|

R. 96, nr 5

38--42

PL

W artykule przedstawiono wyniki analizy dynamicznej konstrukcji wsporczej, której nadmierne drgania wywoływane są pracą maszyn. Wykonano pomiary drgań w różnych punktach konstrukcji przy zróżnicowanych parametrach pracy. Analiza wyników wykazała, że głównym źródłem drgań są wstrząsacze pracujące z f ≈ 25 Hz. Stwierdzono, że drgania w kierunku pionowym są około 8 razy większe niż w kierunkach poziomych. Drgania pomostów były około 4,6 razy wyższe niż drgania konstrukcji stalowej. Konieczne jest dalsze monitorowanie, a także modernizacja systemu monitorującego proces produkcyjny.

EN

This paper presents the results of a dynamic analysis of a support structure. The analysis was performed to identify excessive vibrations caused by the operation of machinery. Vibration measurements were taken at different points of the structure with different operating parameters. Analysis of the results showed that the main source of vibration is the shakers operating at f ≈ 25 Hz. Vibrations in the vertical direction were about 8 times higher than in the horizontal directions. The vibration of the platforms was about 4,6 times higher than the vibration of the steel structure. It is essential to continue monitoring and upgrade the system that monitors the production process.

2

Analysis of Vibrations of the IRB 2400 Industrial Robot

Gierlak Piotr, Pietruś Paulina, Szybicki Dariusz

Pomiary Automatyka Robotyka

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2025

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R. 29, nr 2

53--57

EN

This article provides an analysis of low-frequency vibrations in the IRB 2400 industrial robot using motion amplification technology based on image analysis. This technology allows visualisation of the vibration of the entire robot and analysis of the vibrations of the robot points that can be selected after the image acquisition process has been performed. Impulse force generated with a modal hammer was used to induce robot vibrations. A vibration analysis has been performed that takes into account the different positions of the robot arm. The analysis indicated a strong relationship between the system response and the robot arm position and the robot’s interaction with the environment. The results obtained will be used to plan a robotic mechanical machining process, taking into account the minimisation of robot vibrations.

PL

W artykule przedstawiono analizę drgań niskoczęstotliwościowych robota przemysłowego IRB 2400 z zastosowaniem technologii wzmocnienia ruchu, bazującej na analizie obrazu. Technologia ta pozwala na wizualizację drgań całego robota oraz analizę drgań punktów robota, które można wybrać po przeprowadzeniu procesu akwizycji obrazu. Do wzbudzania drgań robota stosowano wymuszenie impulsowe generowane z zastosowaniem młotka modalnego. Przeprowadzono analizę drgań uwzględniającą różne pozycje ramienia robota. Analiza wskazała silną zależność odpowiedzi układu od pozycji ramienia robota oraz od siły interakcji robota z otoczeniem. Uzyskane wyniki zostaną zastosowane do planowania procesu zrobotyzowanej obróbki mechanicznej z uwzględnieniem minimalizacji drgań robota.

3

An exploration of vibration based damage detection techniques for composite materials

Pathan Firoj U., Patil Milind M., Baviskar Prasad R., Aher Vishnu S.

International Journal of Applied Mechanics and Engineering

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2025

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Vol. 30, no. 3

97--113

EN

Structural damage monitoring is inevitable for the structures to perform during their intended service life adroitly. In the present review, literature related to techniques for diagnosing vibration-intensive damages have been evaluated in order to determine the material characteristics, such as stiffness and damping. Also, extensive review has been presented in the for damage detection in composite materials. The review encompasses the literature published in last 42 years, i.e., 1982 to 2024. The literature review is classified into sections as damage detection workflow, composite materials, damage detection techniques, and advanced damage detection techniques. The usage of strain energy, mode-shapes, waveform dimension, wavelet transform and updating finite element models in detection of damage are also discussed. Further, an overview of concepts, techniques, and advancement in vibration-induced damage detection are presented. The limitations of each technique are explained. An insight on advanced techniques and tools from genetic algorithm and artificial neural network regarding their employability to detect the damage is provided. This work portrays the damage detection methodologies.

4

Chattering analysis of an electro-hydraulic backstepping velocity controller

Eny Gérémino Ella, Eya Honorine Angue Mintsa, Nzue Rolland Michel Assoumou, Senouveau Nzamba

International Journal of Applied Mechanics and Engineering

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2024

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Vol. 29, no. 1

36--53

EN

This paper focuses on the chattering analysis in a backstepping controller used to drive an electro-hydraulic servo system. The chattering phenomenon, well known in sliding mode control, strongly reduces operating performance while causing premature wear of the system. Four cases are studied to highlight the factors influencing the chattering in the backstepping control. In the first case, the effect of the unmodeled fast servo valve dynamics is analysed by comparing a reduced-order backstepping controller with a full-order controller. The second case analyses the sensitivity to the tuning gains of the backstepping controller. The third case emphasises the influence of the parameter of sign function approximation. The last case analyses the sensitivity of the parameter of the time derivative of the virtual controls. The simulation results in the Matlab/Simulink show that the chattering is mitigated by an appropriate gains tuning but above all an appropriate calculation of the derivatives of the virtual controls, particularly for high-order systems.

5

Investigation of the influence of debonding shapes and debonding locations on vibration behavior of sandwich structure

Demircioğlu Ufuk, Çakır Mutlu Tarık

Composites Theory and Practice

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2024

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R. 24, nr 1

39--48

EN

Sandwich structures are employed in many different fields including automobile, marine, and aircraft structures. However, debonding may take place at the core-face sheet interface, reducing the stiffness of the structure. Debonding may occur for a variety of reasons, including initial manufacturing faults, changes in service loads, tool drops, and foreign object impacts. It is critical to comprehend how debonding zones impact the vibration of sandwich structures because decreases in the natural frequencies (NF) could lead to a structure vibrating at resonance and lead to structural failure. This paper investigates the influence of debonding shapes and debonding locations on the free-vibration behavior of sandwich structures. Different sandwich structures that have varied debonding shapes at various locations are modeled using COMSOL MULTIPHYSICS. Debonding is modeled by using the CZM model. Validation studies were performed to validate the current study. After the validation study, free vibration analysis of all the sandwich structures was performed and the first six NF were obtained from the simulations. The results show the influence of the debonding shapes and debonding locations on the NF of the sandwich structures. From the results, it was observed that both the debonding shapes and debonding locations significantly change the NF of the sandwich structures. The debonding shapes cause a reduction and an increase depending on the debonding location. It was also revealed that both debonding shapes and debonding locations have a significant effect on the vibration behavior of sandwich structures. Using this method, the debonding shape and location, delamination shape, and location can be predicted using machine learning algorithms. This study includes free vibration analysis of sandwich structures with different debonding shapes and locations, and the results show that natural frequencies change depending on the debonding shapes and locations. This information can be implemented in machine learning for use in the field of damage detection and utilized to predict the shape and location of delamination in sandwich structures.

6

Structural Health Monitoring for Dębica Railway Steel Arch Bridge in Poland

Nguyen Duc Cong, Salamak Marek, Katunin Andrzej, Poprawa Grzegorz

Civil and Environmental Engineering Reports

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2024

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Vol. 34, no. 2

216--223

EN

The study presents the vibration-based SHM system for the Dębica railway bridge located in Poland. The railway bridge owner was concerned about the excessive and self-excited vibrations of the hangers, the vibration measurement of 8 hangers per span in a total of two spans being monitored. The dynamic responses in both the transverse and longitudinal directions for each hanger under different load events over a nine-month period were recorded and introduced in this paper. The tension force and stress on each hanger are estimated through the natural frequency of the experimental vibration analysis. The proposed approaches could be used to develop a smart alarm system integrated into a vibration-based data-driven SHM system for heavy railway bridges.

7

Vibration analysis of asymmetric sandwich rotating FG porous discs coated with agglomerated nanocomposite facesheets

Jazi Farnoosh Rasooli, Amir Saeed, Arshid Ehsan

Archives of Civil and Mechanical Engineering

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2024

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Vol. 24, no. 4

art. 201, 1--20

EN

The present research conducts free vibration analysis of annular rotating discs made from functionally graded porous materials, and nanocomposite reinforced carbon nanotubes face sheets. Pores distribution in the porous core is considered based on three different patterns, namely Nonsymmetric, Symmetric, and Monotonous ones across the thickness, and also, carbo nanotube dispersion in the face sheets is investigated randomly by considering their agglomeration effect. Kinematic relations of the mentioned structure regarding the shear deformation effects and based on the first-order theory are described, and then, variations of strain and kinetic energies by considering rotation via the calculus variation method are calculated. To extract the governing motion equations and associated boundary conditions, Hamilton's principle is employed, and then they are solved with the aid of the generalized differential quadrature method. After ensuring the correctness of the results obtained from the scripted code by comparing them in the simpler state with the previous research, the effect of different parameters such as pores’ distribution patterns, carbon nanotubes dispersion patterns and their agglomeration, core and face sheets thickness, and other parameters on the natural frequencies of the structure is investigated. Considering the obtained results, it can be found that increasing the porosity leads to a slight increment in the natural frequencies, generally, and increasing the carbon nanotubes’ mass fraction leads to significant enhancement in them. The outcomes of this study can be used in different industries, such as aerospace, military, and marine industries.

8

Micro‑mass sensor‑based vibration response of smart bidirectional functionally graded auxetic microbeams

Wei Y. Y., Al-Furjan M. S. H., Shan L., Shen X., Kolahchi R., Rabani bidgoli M., Farrokhian A.

Archives of Civil and Mechanical Engineering

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2024

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Vol. 24, no. 1

art. no. e38, 2024

EN

Microsensor-based vibration of 2D smart functionally graded sandwich microbeam with attached microparticles is investigated using the strain gradient hypothesis. The application of micro-materials as active sensing particles in micro-sensors has increased the sensitivity performance of micro-sensors that can be able to detect particles, for example, bacteria with very nano-dimensions and low concentrations. The sandwich beam contains a negative Poisson’s ratio auxetic honeycombs covered by a piezoelectric smart layer at the top and a bidirectional functionally graded material (FGM) layer at the bottom layers. Partial differential equations of the simply supported sandwich beams are first attained using the energy method utilizing refined zigzag theory. The coupled final equations are solved analytically utilizing Galerkin’s technique to present the frequency. The impact of the position and mass of the microparticles, applied voltage, material distribution in the bottom layer, size scale parameter, the honeycomb auxetic core geometrical properties, and the layer thickness on the frequency are discussed. The obtained findings showed that by enhancing the mass of the nanoparticle, the frequency is reduced. In addition, the location of the nanoparticle on the beam is important so that when it is close to the beam center, the frequency decreases. Further, by enhancing the thickness of the face sheet, the microbeam frequency decreases but increasing the core layer thickness plays an inverse role. Besides, it is found that when the material in-homogeneity index P x or P z in the 2D-FGM layer is enhanced, the frequency decreases.

9

Application of isogeometric approach to dynamics of curved beam

Łasecka-Plura Magdalena, Białasik Jan, Kuczma Mieczysław, Tabrizikahou Alireza

Vibrations in Physical Systems

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2023

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Vol. 34, nr 1

art. no. 2023117

EN

In the paper dynamics of a free-form Timoshenko curved beam is investigated. The considered problem is solved using isogeometric analysis. Non-uniform rational B-spline (NURBS) basis functions are applied to describe both geometry and displacement field of the considered beam. The Timoshenko beam theory is used to derive the element stiffness and mass matrices. The application of the presented method is shown in numerical examples. The correctness of the presented approach is proved by comparing the obtained results to those available in the literature and calculated by the finite element method. Analysis of convergence is presented for different orders of NURBS basis functions.

10

Research on vibration-based early diagnostic system for excavator motor bearing using 1-D CNN

Yandagsuren Dorjsuren, Kurauchi Tatsuki, Toriya Hisatoshi, Ikeda Hajime, Adachi Tsuyoshi, Kawamura Youhei

Journal of Sustainable Mining

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2023

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Vol. 22, iss. 1

65--80

EN

In mining, super-large machines such as rope excavators are used to perform the main mining operations. A rope excavator is equipped with motors that drive mechanisms. Motors are easily damaged as a result of harsh mining conditions. Bearings are important parts in a motor; bearing failure accounts for approximately half of all motor failures. Failure reduces work efficiency and increases maintenance costs. In practice, reactive, preventive, and predictive maintenance are used to minimize failures. Predictive maintenance can prevent failures and is more effective than other maintenance. For effective predictive maintenance, a good diagnosis is required to accurately determine motor-bearing health. In this study, vibration-based diagnosis and a one-dimensional convolutional neural network (1-D CNN) were used to evaluate bearing deterioration levels. The system allows for early diagnosis of bearing failures. Normal and failure-bearing vibrations were measured. Spectral and wavelet analyses were performed to determine the normal and failure vibration features. The measured signals were used to generate new data to represent bearing deterioration in increments of 10%. A reliable diagnosis system was proposed. The proposed system could determine bearing health deterioration at eleven levels with considerable accuracy. Moreover, a new data mixing method was applied.

11

Eksperymentalne badanie agregatów pompowych z uwzględnieniem podatności fundamentów

Katunin Andrzej, Jaroszewicz Jerzy

Dozór Techniczny

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2023

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z. 1

9--20

PL

W artykule zaprezentowano wyniki badań analizy drganiowej pompy typu 40B80 w celu identyfikacji przyczyn nadmiernych drgań. Badania polegały na pomiarze i analizie widmowej sygnałów drganiowych w łożyskach silnika i pompy w celu identyfikacji składowych harmonicznych i odpowiadających im częstości. Następnie przeprowadzono analizę numeryczną odpowiedzi częstotliwościowej górnej płyty fundamentu badanego agregatu w celu sprawdzenia wpływu drgań własnych fundamentu na drgania rejestrowane w łożyskach.

12

Fabrication of a test rig for gearbox fault simulation and diagnosis

Dubaish Asaad Abdulhussein, Jaber Alaa Abdulhady

Diagnostyka

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2023

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Vol. 24, No. 2

art. no. 2023204

EN

Gearboxes are one of the most important and widely exposed to different types of faults in machines. Therefore, manufacturers and researchers have made significant efforts to develop different fault detection and diagnostic approaches for gearboxes. However, many research foundations, such as universities, are currently working on developing different gearbox test rigs to understand the failure mechanisms in gearboxes. As a result, in this article, a gearbox testing rig was proposed and fabricated to evaluate gear performance under lowspeed working conditions. It describes the primary mechanical apparatus and the measurement tools used during the experimental analysis of a multistage gearbox transmission system. The data-gathering equipment used to acquire the observed vibration data is also discussed. LabVIEW software was used to build a data acquisition platform using an accelerometer and a NI DAQ device. Then different vibration tests were conducted under different operating conditions, when the gearbox was healthy and then faulty, on this test rig, and the gathered vibration data were analyzed based on time domain signal analysis. The preliminary results are promising and open the horizon for simulating different gearbox test scenarios.

13

An integrated study for solving high vibration problem of a deep well turbine pump

El-Gazzar Dalia M.

Diagnostyka

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2023

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Vol. 24, No. 2

art. no. 2023209

EN

Mechanical vibrations are a common problem encountered in many machines, especially for vertical turbine pumps. These pumps are generally difficult to stiffen or damp, but the effective diagnosis must begin with an understanding of the underlying vibratory sources. In the present work, a deep well vertical turbine pump experienced extremely high vibrations for a long time although it still being new. It hasn't been in operation for over 6 months. The pump system suffers from extremely high vibration levels relative to the rotational speed (1X motor dominant frequency). An efficient strategy was implemented by using well-conceived techniques. The experimental modal analysis confirmed a presence of a natural frequency. Modifications were carried out to overcome resonance. Finite element analysis was done to determine the reed critical frequencies as a powerful tool to identify and mitigate vibration issues. On-site motor balancing was done to remove vibrations due to the residual imbalance. Results revealed decreasing vibration level by about 66% after solving all problems.

14

Aproksymacja i ekstrapolacja drgań maszyny indukcyjnej w funkcji liczby zwartych zwojów uzwojenia stojana

Pietrowski Wojciech, Górny Konrad, Marczak Mikołaj

Automatyka, Elektryka, Zakłócenia

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2023

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Vol. 14, nr 1(51)

28--44

PL

Celem badań było rozszerzenie możliwości monitorowania i diagnostyki maszyn elektrycznych na podstawie drgań maszyny. Autorzy zaproponowali bezinwazyjną metodę diagnostyczną uwzględniającą wielofazowe zwarcia międzyzwojowe w uzwojeniu stojana. W pracy przedstawiono i omówiono zarówno proces pozyskiwania sygnału diagnostycznego jak również opracowaną metodę diagnostyczną. Opracowaną metodę zweryfikowano.

EN

The aim of the research was to extend the possibilities of monitoring and vibration diagnostics of electric machines. The authors proposed a non-invasive diagnostic method taking in to account multi-phase inter-turn short-circuits in stator winding. The process of acquiring of the diagnostic signal and proposed diagnostic method have been presented, concluded and discussed. Moreover, the developed method was verified and the error of the proposed method was calculated.

15

Approximation and Extrapolation of Vibrations in Induction Machines as a Function of Numbers of Short-circuited Turns in Stator Winding

Pietrowski Wojciech, Górny Konrad, Marczak Mikołaj

Automatyka, Elektryka, Zakłócenia

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2023

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Vol. 14, nr 1(51)

10--26

EN

The aim of the research was to extend the possibilities of monitoring and vibration diagnostics of electric machines. The authors proposed a non-invasive diagnostic method taking in to account multi-phase inter-turn short-circuits in stator winding. The process of acquiring of the diagnostic signal and proposed diagnostic method have been presented, concluded and discussed. Moreover, the developed method was verified and the error of the proposed method was calculated.

PL

Celem badań było rozszerzenie możliwości monitorowania i diagnostyki maszyn elektrycznych na podstawie drgań maszyny. Autorzy zaproponowali bezinwazyjną metodę diagnostyczną uwzględniającą wielofazowe zwarcia międzyzwojowe w uzwojeniu stojana. W pracy przedstawiono i omówiono zarówno proces pozyskiwania sygnału diagnostycznego jak również opracowaną metodę diagnostyczną. Opracowaną metodę zweryfikowano.

16

Finite element model updating of steel-concrete composite bridge: A study case of the Ruri bridge in Vietnam

Nguyen Duc Cong, Salamak Marek, Katunin Andrzej, Gerges Michael, Abdel-Maguid Mohamed

Archives of Civil Engineering

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2023

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Vol. 69, nr 3

425--443

EN

The study presents the finite element (FE) model update of the existing simple-spans steel-concrete composite bridge structure using a particle swarm optimisation (PSO) and genetic algorithm (GA) approaches. The Wireless Structural Testing System (STS-WiFi) of Bridge Diagnostic, Inc. from the USA, implemented various types of sensors including: LVDT displacement sensors, intelligent strain transducers, and accelerometers that the static and dynamic historical behaviors of the bridge structure have been recorded in the field testing. One part of all field data sets has been used to calibrate the cross-sectional stiffness properties of steel girders and material of steel beams and concrete deck in the structural members including 16 master and slave variables, and that the PSO and GA optimisation methods in the MATLAB software have been developed with the new innovative tools to interface with the analytical results of the FE model in the ANSYS APDL software automatically. The vibration analysis from the dynamic responses of the structure have been conducted to extract four natural frequencies from experimental data that have been compared with the numerical natural frequencies in the FE model of the bridge through the minimum objective function of percent error to be less than 10%. In order to identify the experimental mode shapes of the structure more accurately and reliably, the discrete-time state-space model using the subspace method (N4SID) and fast Fourier transform (FFT) in MATLAB software have been applied to determine the experimental natural frequencies in which were compared with the computed natural frequencies. The main goal of the innovative approach is to determine the representative FE model of the actual bridge in which it is applied to various truck load configurations according to bridge design codes and standards. The improved methods in this document have been successfully applied to the Vietnamese steel-concrete composite bridge in which the load rating factors (RF) of the AASHTO design standards have been calculated to predict load limits, so the final updated FE model of the existing bridge is well rated with all RF values greater than 1.0. The presented approaches show great performance and the potential to implement them in industrial conditions.

17

Vibration analysis of variable thickness functionally graded toroidal shell segments

Vuong Pham Minh, Duc Nguyen Dinh

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 3

art. no. e207, 2023

EN

In this paper, for the first time, the nonlinear vibration response of toroidal shell segments with varying thickness subjected to external pressure is investigated analytically using Reddy’s third-order shear deformation shell theory. The variable thickness shells are made of functionally graded material (FGM) that is created from ceramic and metal constituents. The material properties of FGM shells are assumed to be gradually graded in the thickness direction according to a simple power-law distribution in terms of volume fractions of constituents. Equations of motion of variable thickness FGM toroidal shell segments are established based on Reddy’s third-order shear deformation shell theory with von Kármán nonlinearity. The Galerkin method and the Runge–Kutta method are used to solve the governing system of partial differential equations of motion, and then the nonlinear vibration response of variable thickness FGM toroidal shell segment is analyzed. A numerical analysis is also performed to show the effects of material and geometrical parameters on the nonlinear vibration response of variable thickness FGM toroidal shell segments.

18

Thermoelastic vibration characteristics of asymmetric annular porous reinforced with nano-fillers microplates embedded in an elastic medium: CNTs Vs. GNPs

Arshid Ehsan, Amir Saeed, Loghman Abbas

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 2

art. no. e100, 2023

EN

Due to the vast usage of metal foam structures in branches of science, reinforcing them with nano-fillers makes them more convenient. Hence, in the current study, vibration characteristics of functionally graded porous nanocomposite (FGPN) annular microplates are taken into consideration. Two kinds of nano-fillers, namely Carbon nanotubes (CNTs) and Graphene nanoplatelets (GNPs), are selected as the reinforcements to analyze and compare their effect on the microstructure’s vibrational response. The mentioned nano-fillers are dispersed according to four patterns which affect various mechanical properties of the structure. Similarly, based on given functions which are called porosity distributions, pores are placed in thickness course of the microstructure. Then, its properties are determined via employing Halpin-Tsai and extended rule of mixture micromechanics models. Using the first-order shear deformation theory (FSDT), modified couple stress theory (MCST), and Hamilton’s principle for dynamic systems, governing motion equations and related boundary conditions are derived in asymmetric state, and then, they are solved, and natural frequencies and corresponding mode shapes are extracted with the help of generalized differential quadrature method (GDQM). By validating the results in simpler conditions, effects of the most important parameters are examined. It is found that GNPs are more effective in reinforcing the structure than CNTs. Also, about 15~18 percent reduction in frequencies is seen by increasing the porosity up to seventy percent.

19

Vibration analysis and modelling of light-weight robot arms

Leniowski Ryszard, Wroński Michał

Vibrations in Physical Systems

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2022

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Vol. 33, nr 2

art. no. 2022220

EN

Lightweight robots (LWR) are a new generation of devices intended to be used not only for industrial tasks but also to perform actions in the human environment. This work presents an analysis of selected basic problems related to the vibration properties of light-weight robot arms. The study of vibration is based on the analysis of the root locus on the plane of complex variables. It turns out that their distribution is non-stationary and depends on the parameters of the model (arm geometry, material parameters), but also depends on the type of realised motion, which is not so obvious. Depending on the manoeuvres conducted (acceleration / deceleration), the system may lose (or increase) its oscillating properties at higher frequencies, as well as introduce a structural (measurable) delay. Recognition of the discussed properties along with their modelling is an important element of the design process of the control system of modern, light-weight robots.

20

Improving transportation safety of injured persons by taking into account the biomechanical characteristics of the human body

Gogiashvili Phridon, Lekveishvili Revaz, LekveishvilI Gocha

Transport Problems

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2021

|

T. 16, z. 4

107--119

EN

Ambulance vehicles play a vital role in sustaining the life of injured persons and should a provide safe transportation route to the medical institution. Transportation of injured patients in severe/critical conditions should be carried out with high caution, as there is no guarantee that patients’ health will not be harmed. The goal of this study is to minimize exposure to the external factors such as random shocks, sharp jumps, vibrations caused by irregular roads, speed breakers, weather, etc., that could influence the tasking ability of the medical team and further threaten the life of the already injured patient. This topic has not been widely researched and still requires implementation of novel standards that should improve the safety of the patient. This article aims to define the biomechanics of cabin occupant safety, introduce ways of collecting live data and develop new mechanisms that would allow safer transportation of patients without any meaningful health deterioration causing by the above-mentioned external factors. This study will identify safety hazards in the ambulance environment and determine the effectiveness of suggested countermeasures to mitigate any further injury or deterioration of the patient’s health.