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1

Assessment of the impact of the number of girders on the dynamic behaviour of Geiger dome

Obara Paulina, Solovei Maryna

Archives of Civil Engineering

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2023

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Vol. 69, nr 3

597--611

EN

In this paper, the dynamic behaviour of the tensegrity domes is explored. The consideration includes all cable structures called Geiger domes, i.e., two cases of configurations (with a closed and open upper section) and two variants of the nature of a dome (regular and modified) are taken into account. Particularly, the impact of the number of girders on the natural frequencies is analysed. A geometrically quasi-linear model is used, implemented in an original program written in the Mathematica environment. The results confirm that the number of girders affects the number of infinitesimal mechanisms. However, the dynamic behaviour does not depend on the number of mechanisms. The most important is the nature of a dome and the type of load-bearing girder. Especially, the behaviour of Geiger domes with a closed upper section is specific. In this case, not only the frequencies corresponding to the infinitesimal mechanisms depend on the prestress. There are additional frequencies that depend on prestress. The number of them, and the sensitivity on the initial prestress changes, depends on the number of girders. Generally, for the same number of girders, the natural frequencies of regular domes are higher than for the modified ones.

PL

W artykule zbadano zachowanie dynamiczne kopuł Geigera. W sposób szczególny przeanalizowano wpływ liczby dźwigarów nośnych na częstotliwość drgań własnych. Analizie poddano dwa typy dźwigarów nośnych tj. z zamkniętą (typ A) oraz otwartą (typ B) górną częścią dźwigara. Dodatkowo wzięto pod uwagę dwa typy geometrii kopuły (zwykłą i zmodyfikowaną). Przedstawione rozważania odpowiadają na następne pytania tj. czy jest możliwa kontrola liczby mechanizmów poprzez zmianę liczby dźwigarów nośnych? Jaki typ kopuły (zwykła czy zmodyfikowana) jest łatwiejszy do kontroli? Czy zachowanie kopuł z taką samą liczbą mechanizmów infinitezymalnych jest podobne? Czy liczba częstotliwości drgań własnych, zależnych od wstępnego sprężenia, jest równa liczbie nieskończenie małych mechanizmów? Analiza potwierdziła, że liczba dźwigarów nośnych ma wpływ na liczbę nieskończenie małych mechanizmów. Jednak zachowanie dynamiczne kopuł zależy głównie od geometrii kopuły oraz od typu dźwigara nośnego, a nie od liczby mechanizmów.

2

Assessment of pedestrian comfort and safety of footbridges in dynamic conditions: case study of a landmark arch footbridge

Hawryszków Paweł

Builder

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2021

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R.25, nr 5

78--82

EN

The objective of this paper is to present results of dynamic tests of an arch span of the footbridge in Wronki near Poznań in Poland and clearly summarize them. The investigated footbridge, with asymmetrical arch and the main span 90.0 m long, is an example of original architecture and interesting structural solutions. The research campaign included normal live loads and vandal actions to the footbridge. Normal live loads tests examined the influence of various kinds of the pedestrian activity on the footbridge’s behaviour as: walking, jogging or fast running. The pedestrian comfort was assessed in this type of schemes. Vandal type of excitation consisted of synchronized walking or running and rhythmical half-crouching. The main aim of the vandal live loads was to check structure’s safety and behaviour in the extreme dynamic conditions. The research was carried out in a large group of pedestrians - under a crowd of 40 volunteers.

PL

Celem artykułu jest przedstawienie i podsumowanie wyników badań dynamicznych przęsła łukowego kładki dla pieszych we Wronkach koło Poznania. Badana kładka o niesymetrycznym łuku oraz rozpiętości przęsła głównego wynoszącego 90 m stanowi przykład oryginalnej architektury, a także interesujących rozwiązań projektowych. Zakres badań obejmował normalne obciążenia użytkowe oraz oddziaływania typu wandalistycznego, polegające na intencjonalnym wzbudzeniu drgań. W schematach obciążeń użytkowych normalnych symulowano typowe oddziaływanie pieszych na konstrukcję: chód, bieg typu trucht i szybki bieg. Schematy te posłużyły do oceny komfortu wibracyjnego użytkowania konstrukcji. Schematy obciążeń użytkowych wyjątkowych składały się z chodu i biegu synchronicznego oraz wymuszeń drgań półprzysiadami. Głównym celem tych oddziaływań było sprawdzenie bezpieczeństwa konstrukcji oraz jej zachowania w ekstremalnych warunkach dynamicznych. Badania przeprowadzono przy dużej liczebności grupy - pod tłumem 40 osób.

3

The influence of incrustation and chute blockage on the dynamic behaviour of a bucket wheel excavator slewing superstructure

Gnjatović Nebojša B., Bošnjak Sran M., Milenović Ivan L.J.

Journal of Theoretical and Applied Mechanics

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2020

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Vol. 58 nr 3

573--584

EN

Exploitation of bucket wheel excavators (BWEs) is accompanied by an increase of mass due to transport and adherence of a large amount of the material. Technical regulations do not account for the dynamic behaviour of BWEs. Such problems are analysed as quasi- -static. A procedure and results of investigation of the influence of masses of the bucket wheel (BW) incrustation and soil in a blocked BW chute on the superstructure response are presented. Analysis of sensitivity of dynamic characteristics and the response to adherence of the material is conducted. The method and results can be used in the design stages of new and in reconstructions of obsolete BWEs.

4

Fully coupled multi-physics modeling of the multi-type magnetic particles dynamic behavior in low intensity magnetic separator

Wang Feiwang, Zhao Hongming, Dai Huixin, Du Wuxing

Physicochemical Problems of Mineral Processing

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2019

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Vol. 55, iss. 1

163--172

EN

Studying the dynamic behavior of magnetic particle suspensions in the low intensity magnetic separator has important implications for various mineral beneficiation processes. A new approach for fully coupled multi-physics modeling of the dynamic behavior of multi-type magnetic particles (MTMPs) is developed in the study. In this model, the particle tracing module is employed to identify and determine individual particle trajectories in the fluid and magnetic field, which are modelled through the COMSOL Multiphysics. The results show that the different arrangements of the permanent magnet assembly and the volume percentage of interlocked particles affect the dynamic behavior of MTMPs and the efficiency of the separation. The model is compared with experiments and the particle capture theory and the correctness of the solution obtained from COMSOL is demonstrated. The model gives new possibilities to control, optimise, and develop the process of LIMS.

5

The effect of a cracked tooth on the dynamic response of a simple gearbox with a flexible coupling under acyclism operation

Hammami Ahmed, Hmida Atef, Chaari Fakher, Khabou Mohamed Taoufik, Haddar Mohamed

Journal of Theoretical and Applied Mechanics

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2019

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Vol. 57 nr 3

591--603

EN

In this paper, the effect of a cracked tooth on the dynamic response of a simple gearbox with a flexible coupling is studied. The gearbox is driven by a combustion engine through a flexible coupling for which Nelson and Crandall’s model is used. The acyclism regime is generated by diesel engine inducing fluctuations of speed, torque and meshing stiffness. In addition, the cracked tooth of the wheel gear is modelled by lowering the meshing stiffness. After solving the equations of motion by using the Newmark method, the time response, spectrum, joint time-frequency analysis and envelope spectrum are used to characterize the dynamic response of the defected gearbox where the cracked tooth frequency is irregular and independent of the acyclism frequency.

6

O projekcie kratownicowego mostu kolejowego według norm PN-EN

Oleszek Radosław, Wyrzykowski Mirosław, Grej Krzysztof, Bąk Jerzy

Inżynieria i Budownictwo

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2019

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R. 75, nr 6

282--287

PL

Omówiono wybrane aspekty projektowe, konstrukcyjne i obliczeniowe kratownicowego mostu kolejowego o rozpiętości 75,0 m nad rzeką Drawą km 87+819,20 linii kolejowej E59. Obiekt zaprojektowano zgodnie z normami PN-EN (eurokodami). Przedstawiono szczegóły rozwiązań konstrukcyjnych mostu, metodykę obliczeń statycznych i wymiarowania elementów ustroju oraz wnioski z oceny dynamicznego zachowania się ustroju.

EN

The paper discussed selected aspects of design, construction and calculation of a truss railway bridge with a span 75.0 m above the river Drawa km 87 + 819,20 of the E59 railway line. This railway bridge was designed in accordance with the PN-EN (Eurocode) standard system. Moreover, details of bridge construction solutions, methodology of static calculations and designing of structure elements as well as conclusions from the assessment of the dynamic behavior of the structure were presented.

7

Modified Split Hopkinson Pressure Bar for investigations of dynamic behaviour of magnetorheological materials

Frąś L. J., Pęcherski R. B.

Journal of Theoretical and Applied Mechanics

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2018

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Vol. 56 nr 1

323--328

EN

The magnetorheological fluid is a functional material that is changing its rheological properties and finally solidifies in a magnetic field. The dynamic behaviour, tested with the use of the Split Hopkinson Pressure Bar is an important issue for description of this material, which is commonly used in different kinds of shock absorbers. This note presents a new idea how to modify the known SHPB set up in order to investigate dynamic properties of magnetorheological materials.

8

Effect of the gear local damage and profile error of the gear on the drivetrain dynamic response

Ghorbel A., Zghal B., Abdennadher M., Walha L., Haddar M.

Journal of Theoretical and Applied Mechanics

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2018

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Vol. 56 nr 3

765--779

EN

The dynamic modeling of vibration of a drivetrain is used for increasing our information about vibration generating mechanisms, especially in the presence of some kind of gear faults. This paper describes a research work on the automotive driveline modeling, vibration analysis, and the effect of gear defects on the dynamic behavior of the system. Firstly, main drivetrain components including the engine, clutch, single stage spur gearbox and disc brake are modeled, respectively. The nonlinear dynamic model is simulated by a thirteen degrees of freedom (DOF) system and the nonlinear function is due to the dry friction path. Secondly, two types of defects are modeled and introduced into the spur gear system; local damage and profile error. Then, the nonlinear equations of motion are solved by the numerical Runge Kutta method and a comparative study of the dynamic behavior of the system in healthy and defected cases is discussed for each fault type. The influence of the defects on the vibration response is presented in the time and frequency domain. Finally, analysis of the two defects together is presented.

9

Faults detection in gas turbine rotor using vibration analysis under varying conditions

Djaidir B., Hafaifa A., Kouzou A.

Journal of Theoretical and Applied Mechanics

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2017

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Vol. 55 nr 2

393--406

EN

Monitoring of rotating machines is a very important task in most industrial sectors, which requires a chosen number of performance indicators during the exploitation of such kind of equipments. Indeed, for understanding the undesirable phenomena complexity of the industrial systems under operation, a reliable and an accurate mathematical modeling is required to ensure the diagnosis and the control of these phenomena. This work proposes development of a fault monitoring system of a gas turbine type GE MS 3002 based on vibration analysis technique using spectral analysis tools. The obtained results prove the effectiveness of the presented monitoring tool approach which is applied on the gas turbine, for avoiding the operation under vibration mode and for generating optimal performance during the exploitation of the gas turbine.

10

The dynamic response of a continuous plate for different surface states

Guebailia M., Ouelaa N.

Diagnostyka

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2017

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Vol. 18, No. 4

11--17

EN

Several dynamic effects can be generated and simply observed by the passage of an external mobile exciter forces with different speeds on the surface of an orthotropic continuous plate. In the present paper one illustrates the dynamic behaviour of a thin, orthotropic, multi-span plate, subjected to the passage of moving exciters. In this model, the roughness of the surface of the plate is considered as the contact surface between mobile exciter and the plate. The modal and Newmark integration methods are used in order to solve the coupled plate–exciter equations of motion. One presents especially results which show clearly the influence of the surface states on the dynamic behaviour of the plate and also the generated interaction forces due to the surface roughness. In this paper one presents also the influence of the mobile exciter speeds on the plate dynamic response.

11

Thermal effect on the dynamic error of a high-precision worktable

Zou H., Wang B.

Archives of Civil and Mechanical Engineering

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2017

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Vol. 17, no. 2

336--343

EN

This paper investigates the thermal effect on the dynamic error of a high-precision machine worktable during operation. The thermo-mechanical model was established to obtain the motion errors of the worktable by considering the combined effects of varying internal heat sources and external thermal drifts. The temperature tests were performed to obtain the initial conditions of the model and provide a verification for the analytical convection coefficients and heat flux, which were obtained by inverse analysis. The predicted yawing errors of the worktable were confirmed by interferometer tests. Numerical and experimental results suggest that the environmental temperature fluctuation is the largest contributor to the motion errors of the worktable, and they increase with the increasing of environmental temperature. This study allows deeper insights into the underlying mechanisms that result in the motion accuracy variations of the worktable due to the thermal effects, which can provide a strategy for manufacture to further compensate the thermal error and realize ultra precision.

12

Dynamic behavior of steel frames with tuned mass dampers

Jouneghani K. T., Hosseini M., Rohanimanesh M. S., Dehkordi M. R.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 2

146--158

EN

In this paper, the application of tuned mass damper in improving the response of structures is considered. At first, three frames of 3, 9 and 20 stories are evaluated in which time history analysis is done according to El – Straw earthquake. The maximum reduction of among the three mentioned frames belongs to a 20-stories structure in which the rate of story displacement reduction is between 25 to 45%, and this indicates that by increasing the height of the structure, the performance of tuned mass damper improved. In the second part, the effect of semi-active tuned mass damper is studied on a 10-stories frame. Studies showed that using a tuned mass damper system with viscous damper with controller force decreases the average of maximum displacement of roof story down to 39.9 % and this amount of reduction is 22.8% for semi-active tuned mass damper. Finally, the performance of tuned Single and multiple mass Damper is evaluated on a 20-stories frame, and the results show that single and multiple dampers decrease structures ‘responses and the performance of tuned multiple dampers depends on the mass and frequency ratio and also concluded that the performance of tuned multiple mass dampers is reduced by transition to middle of the structure stories.

13

Analysis of the composite material behaviour subjected to dynamic bending using the hopkinson bar

Massaq A., Rusinek A., Klósak M., Boulouz A., Koutti L.

Engineering Transactions

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2016

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Vol. 64, iss. 1

115--131

EN

The aim of this study is to propose an experimental approach supported by an analytical analysis for polymer materials under dynamic loading. The experimental technique of Hopkinson split pressure bar is used which allows for high impact velocities. The specimens are subjected to the three-point bending and the efficiency of the experimental technique is proved. During quasi-static and dynamic bending tests, the rupture mode is described and the evolution of the energy and the ultimate stresses as a function of the initial impact velocity is discussed. In addition, the critical impact velocity estimated above an important change in the rupture mode is observed. In order to better describe the physical phenomena encountered during the three-point bending impact, the analysis is supported by a rheological model based on a mass-spring system.

14

Black box dynamic modelling of proton exchange membrane fuel cells with artificial neural networks

Kapica J.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

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2016

|

Vol. 5, No 4

85--89

EN

The fuel cells are energy sources which can play an important role in transition of the energy sector into broader use of renewable energy. Numerical modelling provides an easy way to investigate properties of the objects modelled. There are various ways to model dynamic behaviour of the PEM fuel cells including methods using artificial neural networks. There are no clear rules of how a neural network should be configured: how many neurons in the hidden layer and which training algorithm should be used. In a time series modelling task additional parameters including sampling frequency, learning data set duration and number of past data points used for training need to be determined. The paper presents results of research on the influence of various model parameters on the PEM fuel cell modelling accuracy.

15

Faults detection in gas turbine using hybrid adaptive network based fuzzy inference systems

Hadroug N., Hafaifa A., Kouzou A., Chaibet A.

Diagnostyka

|

2016

|

Vol. 17, No. 4

3--17

EN

The main aim of the present paper is the implementation of a fault detection strategy to ensure the fault detection in a gas turbine which is presenting a complex system. This strategy is based on an adaptive hybrid neuro fuzzy inference technique which combines the advantages of both techniques of neuron networks and fuzzy logic, where, the objective is to maintain the desired performance of the studied gas turbine system in the presence of faults. On the other side, the representation of fuzzy knowledge in the learning neural networks has to be accurate to provide significant improvements for modeling of the studied system dynamic behavior. The results presented in this paper proves clearly that the proposed detection technique allows the perfect detection of the studied gas turbine malfunctions, furthermore it shows that the use of the proposed technique based on the Adaptive Neuro-Fuzzy Interference System (ANFIS) approach which uses the adaptive learning mechanism of neuron networks and fuzzy inference techniques, can be a promising technique to be applied in several industrial application for faults detection.

16

A sensitivity analysis on the influence of the external constraints on the dynamic behaviour of a low pollutant emissions aircraft combustor-rig

Amoroso F., Fenza A. de, Petrone G., Pecora R.

Archive of Mechanical Engineering

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2016

|

Vol. LXIII, nr 3

435--454

EN

The need to reduce pollutant emissions leads the engineers to design new aeronautic combustors characterized by lean burn at relatively low temperatures. This requirement can easily cause flame instability phenomena and consequent pressure pulsations which may seriously damage combustor’s structure and/or compromise its fatigue life. Hence the need to study the combustor’s structural dynamics and the interaction between elastic, thermal and acoustic phenomena. Finite element method represent a largely used and fairly reliable tool to address these studies; on the other hand, the idealization process may bring to results quite far from the reality whereas too simplifying assumptions are made. Constraints modelling represent a key-issue for all dynamic FE analyses; a wrong simulation of the constraints may indeed compromise entire analyses although running on very accurate and mesh-refined structural models. In this paper, a probabilistic approach to characterize the influence of external constraints on the modal behaviour of an aircraft combustor-rig is presented. The finite element model validation was performed at first by comparing numerical and experimental results for the free-free condition (no constraints). Once the model was validated, the effect of constraints elasticity on natural frequencies was investigated by means of a probabilistic design simulation (PDS); referring to a specific tool developed in the ANSYS®software, a preliminary statistical analysis was at performed via Monte-Carlo Simulation (MCS) method. The results were then correlated with the experimental ones via Response Surface Method (RSM).

PL

Potrzeba redukcji zanieczyszczeń stawia wobec inżynierów wymaganie projektowania samolotowych komór spalania, które charakteryzują się ubogim spalaniem przy relatywnie niskich temperaturach. W tych warunkach mogą łatwo powstawać zjawiska niestabilności płomienia i wynikające stąd pulsacje ciśnienia, które mogą poważnie uszkodzić strukturę komory spalania lub/i zmniejszyć jej trwałość zmęczeniową. Wynika stąd potrzeba studiów nad dynamiką strukturalną komory spalania i interakcjami między zjawiskami termicznymi i akustycznymi. Metoda elementów skończonych jest narzędziem dość niezawodnym i powszechnie stosowanym, odpowiednim do takich studiów. Z drugiej strony, proces idealizacji może prowadzić do wyników, które są bardzo odległe od rzeczywistości, jeżeli w założeniach przyjęto nadmierne uproszczenia. Modelowanie więzów jest sprawą kluczową dla wszystkich analiz dynamicznych metodą elementów skończonych. Błędna symulacja więzów może istotnie zagrozić całej analizie, nawet gdy korzysta się w niej z bardzo dokładnych modeli strukturalnych o udoskonalonej siatce. W artykule zaprezentowano podejście probabilistyczne by scharakteryzować wpływ więzów zewnętrznych na właściwości modalne zespołu samolotowej komory spalania. Najpierw przeprowadzono walidację modelu elementów skończonych drogą porównania wyników doświadczalnych i obliczeniowych w warunkach swobodnych (bez więzów). Gdy potwierdzono prawidłowość modelu, zbadano wpływ sprężystości więzów na częstotliwości drgań własnych stosując metodę probabilistycznego projektowania symulacji (PDS). Korzystając ze specjalnego narzędzia opracowanego w oprogramowaniu ANSYS, wykonano wstępną analizę statystyczną metodą symulacji Monte Carlo (MCS). Jej wyniki skorelowano następnie z wynikami doświadczalnymi stosując metodę powierzchni odpowiedzi (RSM).

17

The Effect of Non-Fully Filled Gaps in Elastic Tribological Contacts

Mueller M., Voelpel A., Ostermeyer G. P.

Machine Dynamics Research

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2015

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Vol. 39, No. 4

107-115

EN

In recent papers, the authors of this paper investigated the dynamic behavior in partially fluid-filled tribological gaps with a novel modeling technique. The impact of the fluid amount towards the buildup of hydrodynamic pressures has been demonstrated. It shows high nonlinearities with respect to the correlation of the filling ratio and the mean pressure, in particular near the fully filled regime. So far, this modeling technique neglected deformations caused by the pressures in the gap. This paper is focused on fundamental studies on the impact of elastic deformations in combination with varying filling ratios onto the pressure characteristic. The studies are performed using an example of two ellipsoidal bodies moving relative to one another. The size of the ellipsoids is varied which allows modifying the gap topography. In this paper, the essential effect of elastic deformations at very small gaps is shown. It is discussed that it is very complex to formulate a general rule about parameter sets that give the possibility to neglect elastic deformations.

18

Koncepcja procedur badawczych kładek dla pieszych pod obciążeniem dynamicznym

Hawryszków P.

Inżynieria i Budownictwo

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2015

|

R. 71, nr 4

193--197

PL

Rozważania dotyczą problemów zachowania dynamicznego kładek dla pieszych i odbioru drgań przez pieszych. Zaproponowane procedury systematyzują proces badania kładek dla pieszych. Mogą być pomocne na etapie wykonywania próbnych obciążeń. Istnieje możliwość ich adaptacji na potrzeby norm dotyczących wymagań i badań konstrukcji mostowych, w których nie określono dotychczas standardów wykonywania próbnych obciążeń dynamicznych kładek.

EN

The paper concerns problems of the dynamic behaviour of footbridges and reception of vibrations by pedestrians. Formulated procedures regulate the investigation process of footbridges. They can be helpful during proof-load tests. There is also a possibility of adapting these procedures for the purpose of legal regulations, regarding requirements and investigations of bridge structures, as current regulations do not include standard instructions for proof-load tests of footbridges.

19

Dynamika akumulacji ciepła kul PCM

Lichota J., Lepszy M., Wójs K.

Rynek Energii

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2013

|

Nr 2

97--103

PL

W artykule pokazano wyniki eksperymentów pozwalających na identyfikację własności dynamicznych kul wypełnionych materiałem akumulującym ciepło PCM zmieniającym swój stan skupienia ze stałego na ciekły w czasie dostarczania ciepła. Materiał PCM badano wprowadzając sygnał impulsowy poprzez zmianę temperatury wody stanowiącej otoczenie materiału PCM. Odpowiedź impulsową akumulatora ciepła modelowano równaniami inercji. Uzyskany model teoretyczny porównano z odpowiedzią skokową akumulatora. Równania własności dynamicznych pojedynczej kuli pozwalają na modelowanie własności dynamicznych akumulatora ciepła w czasie jego ładowania oraz rozładowania. Ma to duże znaczenie eksploatacyjne przy zastosowaniu predykcyjnych algorytmów skierowania dostawą ciepła np. do systemów ciepłowniczych wyposażonych w źródła kogeneracyjne. Znając przyszły przebieg zapotrzebowania na ciepło przez instalacje u odbiorców oraz znając charakterystyki akumulatora ciepła można w sposób bardziej precyzyjny prowadzić sprzedaż energii elektrycznej na rynku.

EN

This article shows the results of experiments that allow for the identification of dynamic properties of balls filled with phase change material (PCM) changing its physical state from solid to liquid during the delivery of heat. PCM behaviour was studied using impulse signal through changing the temperature of the water, which surrounds PCM. The impulse response of heat accumulator was modeled utilizing transfer functions of first order differential equations. The resulting theoretical model was compared with measurements. Equations of the single ball allow the modeling of dynamic properties of heat accumulator during charging and discharging. This is important during operation of CHP supplying district heating where prediction algorithms are applied. Knowing a future heat demand by customers and knowing the characteristics of the accumulator, CHP can more precisely set an electricity selling policy on a market.

20

Dynamika tłokowego silnika lotniczego

Jeż M.

Silniki Spalinowe

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2011

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R. 50, nr 3

PL

Zbadano możliwości zmniejszenia drgań tłokowego silnika lotniczego. Zastosowano metody doświadczalne i symulacyjne do badań wibroizolacji pasywnej i aktywnej. Korpus silnika był zawieszony na lordach podatno-tłumiących, których nieliniowe charakterystyki zostały wyznaczone własną, opatentowaną metodą. Wynikiem badań są procedury doboru i testowania odpowiednich amortyzatorów gumowych oraz ich konfiguracji. Badania dynamicznych zachowań silnika lotniczego w środowisku Matlab+Simulink rozszerzono na badania wibroizolacji semi-aktywnej i obciążeń losowych. Obliczeniowe badania porównawcze wielu możliwych wersji zawieszenia weryfikowały pomiarowe próby drganiowe kilku wybranych uprzednio zespołów zawieszenia silnika tłokowego typu "bokser" do kratownicy wręgi ogniowej konstrukcji płatowca.

EN

The possibility of reducing the vibrations of airplane piston engine was studied. Experimental tests and numerical simulation methods were applied for the passive and active vibroisolation. Engine corps was suspended on elasto-damping mounts, whose nonlinear characteristics were identified with own, patented method. The investigation resulted in procedures for choosing and checking appropriate rubber mounts and their configuration. The aeroengine behavior simulation in Matlab+Simulink environment was extended to investigate the opportunity of semi-active vibroisolation and sustaining stochastic excitations. Computational comparison of many possible suspension versions were verified by vibration measurement checks of piston "boxer" engine assembled with few chosen mounting sets to the airplane engine frame.