Wyniki wyszukiwania - BazTech

1

Investigating Vibration Transmission in Cargo Containers During Heavy-Duty Off-Road Transport

Vilau Radu, Voicu Daniela, Stoica Ramona-Monica, Ciobotaru Ticusor, Rykała Magdalena, Rykała Łukasz

Advances in Science and Technology. Research Journal

|

2024

|

Vol. 18, no 4

312--328

EN

This article focuses on the investigation and analysis of vibrations transmitted to cargo during off-road transportation, with particular emphasis on the impact of vehicle and road surface interactions. The primary objective of the research is to quantify and characterize the amplitudes of vibrations generated by the interaction between heavy-duty truck tires and rough terrain, and their subsequent transmission to cargo containers. To achieve this, a virtual model of a tactical transportation truck was created using TruckSim software. Two characteristic off-road tracks were simulated, based on driving conditions typically experienced by heavy-duty vehicles in demanding logistical scenarios. The experimental validation of the virtual model was conducted using a heavy-duty truck outfitted with a 20 ft (6096 mm) cargo container. The results of the work include recorded acceleration data, suspension behavior, and the maximum driving speed at which the vehicle remained stable on both tracks. Moreover, the work is a direct response to the needs of the automotive industry and the military.

2

Badanie efektywności usuwania frakcji stałej z zawiesiny pochodzącej z zakładu wzbogacania rudy miedzi

Warzecha Piotr, Hilger Bartłomiej

Przemysł Chemiczny

|

2023

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T. 102, nr 10

1069--1073

PL

Przedstawiono zagadnienie związane z oczyszczaniem zawiesiny pochodzącej z zakładu wzbogacania rudy miedzi. W celu efektywnego przetworzenia wydobywanej rudy stosuje się procesy jej wzbogacenia, a rezultatem działania tych procesów jest otrzymywanie koncentratu oraz odpadu poflotacyjnego. Znaczna część odpadów poflotacyjnych zawiera istotną ilość pożytecznego kruszcu, który może być wykorzystany. W prowadzonych badaniach zwrócono szczególną uwagę na proces koagulacji odpadu poflotacyjnego. W tym celu spośród dostępnych na rynku koagulantów wybrano i przetestowano koagulanty glinowe oraz żelazowe. Ustalono dawkę referencyjną koagulantu oraz wykonano ocenę efektywności procesu oczyszczania (klarowania) badanej zawiesiny.

EN

Model mixts. with known concns. of solid particles were prepared from the dewatered and dried post-flotation sludge from the Cu ore enrichment plant, their turbidity was detd. and the coagulation process was carried out using Fe and Al coagulants. The reference dose of the coagulant was detd. and the effectiveness of the purification (clarification) process of the tested suspension was assessed. The use of the Al coagulant required a higher dose compared to the Fe coagulant to achieve a similar level of suspension purification.

3

Freight car model with Y25 bogies stability analysis

Dusza Mirosław

Pojazdy Szynowe

|

2023

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Nr 3-4

1--24

EN

Y25 (25Tn) bogies have been used in freight cars for over 50 years. It is a proven design with a positive opinion in many European countries. In addition to the generally positive opinion about the operational properties of the Y25 bogies, there are sometimes publications whose authors notice certain imperfections related mainly to the so-called running instability, resulting in derailment under certain motion conditions. This paper presents results simulation of motion tests of a freight car with Y25 bogies. A freight car model was created using the VI-Rail software. The research focus on determining the critical velocity and examining nature of the model solutions in the overcritical velocity range. Straight track as well as curved track motion is analysed. Empty and full wagon properties are considered. Impact of changes the suspension system selected parameters values on vehicle model solutions stability as well as the vehicle impact on track was analysed.

4

Quantification of solid particle transport in suspension in a stream : Case of Wadi Zeddine Ain-Defla, Algeria

Bouleknafet Zohir, Elahcene Omar

Journal of Water and Land Development

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2023

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no. 56

102--108

EN

Arid and semi-arid areas are characterised by differentiation in meteorological conditions. Sometimes the rains are rare and not very intense and at other times they are dense and very intense, resulting in torrents that often lead to strong soil erosion. Most of the time, the losses occur at the solids level because the erosion effect is too high. In this study, we want to evaluate the transfer of solid sediments as a function of liquid transport in the basin of Wadi Zeddine at Ain Defla in Algeria. To understand this phenomenon, we used the data of liquid flows (Ql, m3∙s-1) and concentration of suspended sediments (C, g∙dm-3), transported in the river, the data collected by the NWRA (National Water Resources Agency), over 24 years have been used to find a relationship between these two quantities, to estimate the quantity of solid transport Qs (kg∙s-1) in the watercourse of the catchment area studied. The results obtained show a good correlation between solid and liquid flows, with a correlation coefficient estimated at 90%, and the average annual sediment supply recorded at the outlet of the Wadi Zeddine watershed is estimated at around 88,048 Mg, which corresponds to 202 Mg∙km-2∙y-1 erosion rate. This value is comparable to those found in other regions with similar hydrological regimes.

5

Analysis of the effectiveness of changes introduced to the suspension system of the Scorpio 7 Martian rover

Bernat Rafał, Lorek Bartłomiej, Kosobudzki Mariusz

Journal of TransLogistics

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2023

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Vol. 19

1-13

EN

The paper describes an innovative solution for the suspension system of the Scorpio 7 Martian rover, developed based on the previous generation of the vehicle - Scorpio X. The machine was intended to participate in Martian rover competitions from the Rover Challenge series. The document presents an analysis of the parameters characterising the discussed suspension system, with heavy emphasis on the mass of the platform, deflection under working conditions, amount of space required and angular positions of paramount components. Those characteristics are compared to values describing the systems of Scorpio X.

6

Feasibility study of a rail vehicle damper fault detection by artificial neural networks

Melnik Rafał, Koziak Seweryn, Dižo Ján, Kuźmierowski Tomasz, Piotrowska Ewa

Eksploatacja i Niezawodność

|

2023

|

Vol. 25, no. 1

art. no. 5

EN

The aim of the study was to investigate rail vehicle dynamics under primary suspension dampers faults and explore possibility of its detection by means of artificial neural networks. For these purposes two types of analysis were carried out: preliminary analysis of 1 DOF rail vehicle model and a second one - a passenger coach benchmark model was tested in multibody simulation software - MSC.Adams with use of VI-Rail package. Acceleration signals obtained from the latter analysis served as an input data into the artificial neural network (ANN). ANNs of different number of hidden layers were capable of detecting faults for the trained suspension fault cases, however, achieved accuracy was below 63% at the best. These results can be considered satisfactory considering the complexity of dynamic phenomena occurring in the vibration system of a rail vehicle.

7

Analiza budowy i działania układu zawieszenia łazika Scorpio X

Lorek Bartłomiej, Bernat Rafał, Kosobudzki Mariusz

Journal of TransLogistics

|

2022

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Vol. 8, nr 1

61-72

PL

W artykule przedstawiono charakterystykę konstrukcji układu zawieszenia zależnego pojazdu wysokiej mobilności Scorpio X, skonstruowanego na potrzeby uczestniczenia w zawodach łazików marsjańskich serii Rover Challenge. Przedstawiono i omówiono podstawowe wymagania regulaminowe zawodów oraz koncepcję zawieszenia pojazdu. Analizy ograniczono do wybranych warunków ruchu pojazdu, tj. pokonywania pojedynczej przeszkody terenowej. Wyznaczono przełożenie kinematyczne w przyjętym układzie zawieszenia oraz poddano analizie wartości sił, jakie oddziałują na elementy zawieszenia. Obliczono wartości odkształceń elementów zawieszenia i ramy pojazdu. Przedstawiono również wnioski z użytkowania pojazdu i wymagane zmiany jakie należy wprowadzić do kolejnej wersji pojazdu.

EN

The article presents the characteristics of the structure of the dependent suspension system of the Scorpio X high-mobility vehicle, constructed for the purpose of participating in the competition of Mars rovers of the Rover Challenge series. The basic regulatory requirements of the competition and the concept of the vehicle suspension were presented and discussed. The analyses were limited to selected vehicle motion conditions, i.e. negotiating a single terrain obstacle. The kinematic ratio in the adopted suspension system was determined, and the values of forces that affect the suspension elements were analyzed. The deformation values of the suspension elements and the vehicle frame were calculated. The conclusions from the use of the vehicle and the required changes to be made to the next version of the vehicle were also presented.

8

Investigations on an influence of the material properties on vibrations of active rocker-bogie suspension

Sokół Krzysztof, Pierzgalski Maciej

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 1

art. no. e138239

EN

Unmanned vehicles are often used in everyday life, mostly by rescue teams or scientists exploring new terrains. In those constructions, the suspension has constant dimensions, which leads to many disadvantages and limits the application area. The solution to these problems can be creating a six-wheeled mobile platform that can dynamically change the wheelbase in relation to the area of action or terrain inclination angle. The active change in location of the center of gravity gives a possibility to access sloppy obstacles not available with classical suspensions. The main scope of this study is to investigate the influence of material properties on vibration frequency at different lengths of suspension members. The obtained results will allow finding the optimum material for producing a prototype unit.

9

An Influence of the Material Properties on the Endurance of the Self-Adjustable Rocker-Bogie Suspension

Sokół Krzysztof, Pierzgalski Maciej

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 2

543--548

EN

In this paper one presents the new concept of a rocker-bogie suspension where the suspension members can change their length. As a result of this action the frame with suspension is able to adjust to the specific environmental conditions. The main problem with the designed suspension system is a fact that with an extension of the suspension members their slenderness increases as well as final displacements. The solution of this problem is not so simple because the construction must meet the specific requirements due to participation of the mobile platform in different competitions. In the presented results of numerical simulations one shows an influence of the different materials on stress and displacements magnitudes of suspension members when the mobile platform hits an obstacle. This situation allows one to test different engineering solutions in the worst case scenario when suspension elements may be damaged. Finally the optimum design is presented.

10

Badanie fizyczno-chemicznych właściwości zawiesin dolomitowych

Warzecha Piotr, Hilger Bartłomiej, Wisła-Walsh Ewa

Przemysł Chemiczny

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2020

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T. 99, nr 9

1376--1379

PL

Przedstawiono wyniki badań fizyczno-chemicznych właściwości zawiesin dolomitowych. Badania obejmowały pomiar rozkładu wielkości cząstek, analizę chemiczną i fazową dolomitów, a także określenie zależności między stężeniem zawiesin a ich mętnością.

EN

Three dolomites from various mines were analyzed for particle size distribution, as well as for chem. (XRF and EDS) and phase (diffractometer) compn. Turbidity depended on the suspension concn., grain size of the dolomite and the presence of other mineral admixtures (illites, smectites).

11

Wzmocnienie dachu kompleksu produkcyjno-biurowo-magazynowego

Midzianowski Eugeniusz, Mojzess Paweł

Materiały Budowlane

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2020

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nr 5

43--44

12

Impact of coil factors on a hydraulic electric inerter based vehicle suspension

Zhang Hongdang, Shen Yujie, Yang Hongtu

Journal of Theoretical and Applied Mechanics

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2020

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Vol. 58 nr 3

711--722

EN

This paper concerns the impact of coil factors on a hydraulic electric inerter-based vehicle suspension. A hydraulic electric inerter device is first introduced, and the dynamic model of a quarter car is established. Subsequently, the influences of the coil factors on the body acceleration, suspension working space and dynamic tire load are investigated in both the time and frequency domain. Results show that the coil factors have a slight effect on the vehicle suspension performance, decreasing the root-mean-square (RMS) of the vehicle body acceleration and increasing the RMS of the suspension working space and dynamic tire load.

13

Rheological and deformation behavior of natural smart suspensions exhibiting shear thickening properties

Gürgen Selim, de Sousa Ricardo J. Alves

Archives of Civil and Mechanical Engineering

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2020

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Vol. 20, no. 4

166--173

EN

Shear thickening fluid (STF) is a very interesting and promising material in several application fields where a different mechanical is demanded based on loading rates, like body armor and vibration insulators. Cork is a natural cellular material by excellence, filled with well-known beneficial effects in terms of insulation and also interesting crashworthiness properties. In this work, cork grains of very small size (0.5–1.0 mm) are added to two different shear thickening suspensions, one of them a fully natural water and cornstarch, and the other based on fumed silica and polyethylene glycol. The rheology of these eco-friendly suspensions was investigated and the influences of including cork grains were discussed. In addition, microscopic analyses were carried out to observe the deformations at each component during the shear thickening phenomenon. Cork grains reduce the load-carrying capacity in the suspensions due to the deformable characteristics of cork. For this reason, shear thickening properties are suppressed in the mixtures. Despite this, it is possible to state that viscosity increase in the mixtures leads to strong particle contacts, and thereby resulting in particle deformations in the main constituent powder as well as in the cork additives due to their softer structures.

14

The influence of temperature on the damping value of shock absorbers determined by the Eusama method

Jurecki Rafał S.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2019

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nr 60 (132)

34--40

EN

The article presents the legal requirements for shock absorbers in suspension, for a vehicle in which they are mounted to be allowed on Polish roads. A short description of the working methodology of the device used to determine the effectiveness of a shock absorber’s damping (sometimes referred to as relative wheel adhesion) is given on the basis of the Eusama method. The method of carrying out the tests on a sample of five passenger cars are described, along with the tests carried out at different temperatures for shock absorbers installed in a suspension system. The results of the diagnostic tests of the shock absorbers carried out on a diagnostic stand, in accordance with the Eusama method, are presented. The results confirm that the ambient conditions – the temperature of the chassis components (including the shock absorbers) – only slightly influence the values of their damping efficiency.

15

The method of estimating kinematic road excitation with use of real suspension responses and model

Klockiewicz Zbyszko, Ślaski Grzegorz

Vibrations in Physical Systems

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2019

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Vol. 30, nr 2

art. no. 2019214

EN

The paper deals with the problem of vertical kinematic excitations in road vehicle dynamics simulation, with the main focus on reconstruction of random excitations using measured dynamic responses of a car suspension. The possibility of causing excitations adequately in terms of chosen conditions of exploitation and in reliable way is crucial to properly asses ride comfort, ride safety as well as rattle space and fatigue strength of suspension elements. The paper presents a method of generating equivalent kinematic excitation allowing for reconstruction of suspension dynamic responses in simulation. The method uses unsprung mass accelerations acquired during test rides and a model of vertical suspension dynamics. The method uses estimated displacements of unsprung mass as a preliminary approximation of kinematic excitation and tracking control system with a PID controller, which causes corrections of kinematic excitations transforming it to the form that allows for faithful reconstruction of unsprung mass accelerations and, in turn, kinematic excitations. The paper presents the basic structure of kinematic excitations’ reconstruction system as well as a method of tuning PID controller’s coefficients so that the error in estimation is minimized. Research and verification of results were done using a sine chirp signal and constant frequency sine waves. The similarity of estimated road profiles is high with error no larger than 8% of the original signal’s amplitude.

16

Simulation study of the method of random kinematic road excitation’s reconstruction based on suspension dynamic responses with signal disruptions

Klockiewicz Zbyszko, Ślaski Grzegorz, Spadło Mikołaj

Vibrations in Physical Systems

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2019

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Vol. 30, nr 2

art. no. 2019208

EN

The paper presents the results of simulation studies of the method of random kinematic road excitation’s reconstruction based on the dynamic responses of the suspension acquired in road tests. The method uses registered unsprung mass accelerations as well as model of suspension’s vertical dynamics and tracking control with PID controller to monitor unsprung mass accelerations’ signal in simulation. In the simulation the quality of reconstruction of random irregularities of the road profile was tested. The road profiles were generated based on their power spectral density of road profile heights that is in line with the description given in ISO 8608 standard. Four road classes had their profiles estimations tested – A, B, C and D (corresponding to highways through city roads to the very bad quality roads). The influence of the simulated noise in the suspension’s dynamic response signal – i.e. unsprung mass acceleration – was also tested. The methods of processing of the initial acceleration’s signal from the road tests were proposed and achieved accuracy was defined. Lastly, the necessary requirements to use the method effectively were defined and its limitations were listed.

17

The use of a bead mill for the production of agrochemical suspensions

Szwedziak Katarzyna, Grzywacz Żaneta, Tomaszewski Sławomir

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2019

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nr 22(3)

271--280

EN

Plant protection products represent one of the most innovative branches of the agrochemical industry which requires considerable financial investment to adequately meet agricultural needs. The optimal agrochemicals should enable farmers to maximize yields, and their components should remain active over long periods of time regardless of weather conditions. This article describes an innovative technology for the production of agrochemical suspensions in a bead mill. The suspension acts as a carrier of active ingredients. The parameters of the bead mill were presented, and the resulting suspensions were used in the production of fungicides. The parameters of the substrates used in the production of agrochemicals have to comply with legal regulations. The present experiment involved liquid chromatography, and it was conducted in accordance with good practice, in line with CIPAC guidelines.

18

Experimental investigation of Microcystis aeruginosa cyanobacteria thickening to obtain a biomass for the energy production

Malovanyy Myroslav, Zhuk Volodymyr, Nykyforov Volodymyr, Bordun Igor, Balandiukh Iurii, Leskiv Galyna

Journal of Water and Land Development

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2019

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no. 43

113--119

EN

The purpose of the presented research is to analyse possible methods of thickening of the Microcystis aeruginosa (Kützing) Kützing cyanobacteria using the obtained concentrate as a biomass for the production of energy carriers and biologically valuable substances. Method of cyanobacteria thickening under the action of electric current and in the electric field, as well as the method of coagulation–flocculation and gravity thickening, was experimentally investigated in labscale conditions. Electrical methods didn't show positive results for the Microcystis aeruginosa thickening, despite the reports of their potential efficiency in a number of previous studies. The high efficiency of the method of coagulation– flocculation and gravity thickening of Microcystis aeruginosa suspensions was obtained. The optimum concentrations of industrial polymeric coagulants and flocculants for the thickening of Microcystis aeruginosa suspensions were defined in the range of about 10 ppm for the coagulants and about 1 ppm for the flocculants. Negative effect of the previous cavitational treatment of the diluted suspensions of Microcystis aeruginosa on the effectiveness of the coagulation–flocculation and gravitational thickening was confirmed experimentally. Hydrodynamic cavitation should be recommended to use after the thickening as the next step of processing of concentrated suspensions of Microcystis aeruginosa to achieve maximum extraction of energy carriers and biologically valuable substances.

PL

Celem przedstawionych badań była analiza możliwych metod zagęszczania cyjanobakterii Microcystis aeruginosa (Kützing) Kützing do uzyskania koncentratu biomasy przydatnego do produkcji energii i substancji czynnych biologicznie. W skali laboratoryjnej analizowano metody zagęszczania pod wpływem prądu i pola elektrycznego oraz metody koagulacji– flokulacji i zagęszczania grawitacyjnego. Metody elektryczne nie dały pozytywnych wyników mimo wielu wcześniejszych badań na temat ich potencjalnej efektywności. Dużą efektywność uzyskano natomiast w przypadku metod koagulacji– flokulacji i grawitacyjnego zagęszczania zawiesiny Microcystis aeruginosa. Optymalne stężenie przemysłowych polimerowych koagulantów użytych do zagęszczania ustalono na 10 ppm, a flokulantów – na 1 ppm. Doświadczalnie potwierdzono ujemny wpływ wcześniejszego poddawania rozcieńczonych roztworów Microcystis aeruginosa działaniu kawitacji na skuteczność zagęszczania metodami koagulacji i flokulacji oraz zagęszczania grawitacyjnego. Hydrodynamiczną kawitację zaleca się stosować po zagęszczaniu, jako następny etap w przetwarzaniu zagęszczonej zawiesiny Microcystis aeruginosa do postaci nośnika energii i pozyskania substancji biologicznie czynnych.

19

Analysis of transverse stability parameters of hybrid buses with active trailers

Sakhno V., Poliakov V., Murovanyi I., Selezniov V., Vovk Y.

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2018

|

z. 101

185--201

EN

The objective of the article is to determine the transverse stability indexes of hinge-connected buses (HCBs) by applying the computation-analytical method. The transverse stability parameters of hybrid buses with active trailers are analysed. Based on these parameters (the angles of the roll and redistribution of loads on the sides), the analytical dependences are developed. The dependences describe the movement of the parts of HCBs in the vertical plane. Considering the action of longitudinal and transverse forces, the roll angles of the bus and the trailer were determined. The limiting angle of the side roll of the bus rollover was found to be γамах = 27.560γмах, and the trailer rollover to be γамах = 30.210. The obtained transverse stability indexes of HCBs with a hybrid power plant testify to the compliance with the standard DSTU UN/ECE R 111-00.

20

The influence of vehicle preparation on the results of suspension kinematics measurement

Wach K.

Technical Transactions

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2018

|

Vol. 115, iss. 8

199--209

EN

This paper concerns the assessment of the impact of tyre pressure and additional vehicle loading which is inconsistent with the manufacturer’s requirements on the results of wheel alignment measurement. A sample of results from tests performed on a second generation Toyota Prius and a fifth generation Volkswagen Passat are presented. The tested vehicles differed in the types of front axle wheel suspension. An analysis of the obtained results was conducted. The analysis revealed differences between the results of reference tests performed in accordance with the requirements of vehicle manufacturers and those conducted for incorrectly prepared vehicles. The values of these differences depended, inter alia, on the type of suspension.

PL

Praca dotyczy oceny wpływu ciśnienia w ogumieniu oraz obciążenia pojazdu niezgodnego z wymaganiami producenta, na wyniki pomiaru geometrii zawieszenia. Przedstawione zostały przykładowe wyniki prób przeprowadzonych na samochodach Toyota Prius II generacji oraz Volkswagen Passat generacji piątej. Pojazdy różniły się rodzajami zawieszenia kół osi przedniej. Wykonana została analiza uzyskanych wyników, która wskazała różnice pomiędzy wynikami prób referencyjnych – przeprowadzonych zgodnie z wymaganiami producentów – a próbami dla pojazdów niewłaściwie obciążonych bądź z niewłaściwym ciśnieniem w ogumieniu. Wartości tych różnic uzależnione były między innymi od rodzaju zawieszenia.