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1

Study to Determine the Effect of Blade Distance and Chain Speed on the Productivity of Trench Excavators Using Taguchi Method

Giang Duong Truong

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 4

139--149

EN

Chain trench excavators are widely used in the world for trenching in agriculture, laying underground cables, digging trenches. In this study, the research object is a small chain-type trench excavator. The purpose of the study is to evaluate and select the parameters of the chain loader to the machine productivity and evaluate the results of the experimental machine theory calculation. Experimental measurement parameters include machine speed when working, chain speed, blade distance adjustment on the chain. Research method is to conduct experiments using Taguchi method to design experiments and Minitab software to analyze data. Experimental results and numerical analysis determined that the optimal set of parameters was the distance of 2 cutting edges on the chain, the active sprocket rotation speed for the highest productivity. Compared with the results from the theory using the design, the deviation of the optimal parameters is less than 5%. Experimental process design and parameter influence analysis by Taguchi method, ANOVA analysis have identified reasonable parameters, highest productivity target.

2

Vibration control of a rotating shaft by passive mass-spring-disc dynamic vibration absorber

Nguyen Duy Chinh

Archive of Mechanical Engineering

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2020

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LXVII, nr 3

279--297

EN

Shaft is a machine element which is used to transmit rotary motion or torque. During transmission of motion, however, the machine shaft doesn’t always rotate with a constant angular velocity. Because of unstable current or due to sudden acceleration and deceleration, the machine shaft will rotate at a variable angular velocity. It is this rotary motion that generates the moment of inertial force, causing the machine shaft to have torsional deformation. However, due to the elasticity of the material, the shaft produces torsional vibration. Therefore, the main objective of this paper is to determine the optimal parameters of dynamic vibration absorber to eliminate torsional vibration of the rotating shaft that varies with time. The new results in this paper are summarized as follows: Firstly, the author determines the optimal parameters by using the minimum quadratic torque method. Secondly, the maximization of equivalent viscous resistance method is used for determining the optimal parameters. Thirdly, the author gives the optimal parameters of dynamic vibration absorber based on the fixed-point method. In this paper, the optimum parameters are found in an explicit analytical solutions, helping the scientists to easily find the optimal parameters for eliminating torsional vibration of the rotating shaft.

3

Ship movement simulation studies used to optimize waterway system elements comprising the Przesmyk Orli Turning Basin in the Port of Szczecin

Gucma S., Ślączka W.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2016

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nr 45 (117)

82--87

EN

This paper presents a simulation method for identifying optimal parameters for turning basins on waterways. This method has been used for the detailed design of the Przesmyk Orli Turning Basin in the Port of Szczecin. Methods of this type allow the parameters of a turning basin to be optimized so long as the facility is fixed in one location.

4

Matematyczny model analizy strumienia jakości

Zwolińska B.

Autobusy : technika, eksploatacja, systemy transportowe

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2016

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R. 17, nr 12

1906--1913

PL

W artykule przedstawiony jest model matematyczny opracowany dla wydzielonego strumienia komponentów wejściowych. Zbudowany model ma służyć do walidacji potoków produkcyjnych w aspekcie jakości. Zamodelowany układ jest odzwierciedleniem rzeczywistych przepływów materiałowych na wejściu przedsiębiorstwa produkcyjnego. Do badań i modelowania został wybrany komponent, który stanowi znaczną wartość w urządzeniu końcowy. Ponadto ze względów organizacyjnych nie jest możliwa do przeprowadzenia kontrola parametrów pracy przed montażem komponentu w finalnym urządzeniu. W celu minimalizowania kosztów poniesionych na zużycie zasobów ważne jest aby liczba wadliwych komponentów była równa zero, szczególnie dotyczy to wad ukrytych, które możliwe są do stwierdzenia podczas testowania wyrobu gotowego.

EN

Article depicts the mathematical model made for the certain stream of input components. This model can be used to validate the production stream in terms of quality. This system is a reflection of actual flow of material in the production company. Component which is very important to the device has been chosen to model and study. Moreover, due to the organizational reasons, it is impossible to conduct the control of the work’s parameters before installing it in the device. To minimalize the expenses for resources which will be used, it is important to be sure that every component will work properly and there is no place for any defective part. It is particularly important in case of latent defects which cannot appear unless the tests of final product begin.

5

Traffic fatalities prediction based on support vector machine

Li T., Yang Y., Wang Y., Chen C., Yao J.

Archives of Transport

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2016

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Vol. 39, iss. 3

21--30

EN

To effectively predict traffic fatalities and promote the friendly development of transportation, a prediction model of traffic fatalities is established based on support vector machine (SVM). As the prediction accuracy of SVM largely depends on the selection of parameters, Particle Swarm Optimization (PSO) is introduced to find the optimal parameters. In this paper, small sample and nonlinear data are used to predict fatalities of traffic accident. Traffic accident statistics data of China from 1981 to 2012 are chosen as experimental data. The input variables for predicting accident are highway mileage, vehicle number and population size while the output variables are traffic fatality. To verify the validity of the proposed prediction method, the back-propagation neural network (BPNN) prediction model and SVM prediction model are also used to predict the traffic fatalities. The results show that compared with BPNN prediction model and SVM model, the prediction model of traffic fatalities based on PSO-SVM has higher prediction precision and smaller errors. The model can be more effective to forecast the traffic fatalities. And the method using particle swarm optimization algorithm for parameter optimization of SVM is feasible and effective. In addition, this method avoids overcomes the problem of “over learning” in neural network training progress.

6

The Technological Parameter Optimization of Rapid Freeze Prototyping for 3D Tissue Scaffold Fabrication

Liu D., Liu Y., Jing C., Wang Q., Li Q., Hu Q.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 9b

47-50

EN

When using the Rapid freeze prototype (RFP) process to fabricate 3D tissue bone scaffold, the selecting of technological parameters directly affects lap ratio, which is the foundation of continuous fabrication and scaffold quality. Through analyzing the force of non-solidified fiber, Velocity ratio, liquid temperature, solid content, nozzle diameter and row spacing have been chosen as the influence factors and the L16 (45) orthogonal experiments have been done The experiments result is that material viscosity and row spacing is the most important factors for lap ratio influence. Optimal parameters combination has been got by range analysis. Finally, the mixed solution of gelatin-chitosan experiment with the optimal parameters has successfully produced multilayer tissue bone scaffold, including multiple scale structure.

PL

W artykule zaprezentowano process wytwarzania materiałów trójwymiarowych metoda gwałtownego oziębiania – RFP (rapid freeze prototype). Materiałem wyjściowym jest mieszanina żelatyny i chitozanu. Na proces tworzenia struktury ma wpływ wiele czynników, takich jak: temperatura cieczy, zawartość składnika stałego, rozmiary węzłów, średnica i odstępy między rzędami.

7

Wielokryterialny model i algorytm optymalizacji centrów logistycznych

Cisowski T.

Postępy Nauki i Techniki

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2012

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Nr 13

25-29

PL

W artykule zaprezentowano wielokryteriowy matematyczno-ekonomiczny model centrum logistycznego, w którym kryteria optymalizacji charakteryzują jakość funkcjonowania, wyposażenie techniczne i technologię pracy poszczególnych jego podsystemów. Model ten uwzględnia również wielkość inwestycji, przeznaczonych na rozwój infrastruktury technicznej. Ponadto przedstawiono interaktywny algorytm wyznaczania, na bazie modelu wielokryteriowego, optymalnych parametrów technicznych centrum logistycznego.

EN

In the article the multi-criteria mathematical and economical model of the logistic centre was presented. Criteria of optimization characterize the functioning quality, technical equipment and working technology of particular subsystems. In the model we consider the size of the investment dedicated to the development of technical infrastructure. In addition, the interactive algorithm of establishing the optimal parameters was presented to some extent.

8

The method used to determine optimal parameters of traction vehicles with various types of start-up

Wnuk M.

Archives of Transport

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2003

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Vol.15, iss.3

101-115

EN

The method used to determine optimal parameters of DC traction vehicle with resistor start-up and impulse start-up with or without energy recuperation is presented. Unitary traction energy consumption in relation to train car mass was taken as a criterion function. Train passage is reduced to an optimisation task in which train running parameters are taken as decision variables and then the following traction vehicle parameters: vehicle power and maximum speed, saturation degree and magnetic excitation, start-up current intensity and then - train car mass were added. Far this purpose, a model of traction vehicle, in which traction characteristics are described depending on the above mentioned parameters, was added. The optimisation was made by means of standard gradientless procedure. It was revealed that optimal parameters of traction vehicles do not depend on the type of start-up.

PL

Przedstawiono metodę wyznaczania optymalnych parametrów pojazdu trakcyjnego prądu stałego z rozruchem rezystorowym oraz rozruchem impulsowym z odzyskiem i bez odzysku energii. Jako funkcjękryterialną przyjęto jednostkowe zużycie energii trakcyjnej odniesione do masy wagonów. Przejazd pociągu sprowadzono do zadania optymalizacji, w którym jako zmienne decyzyjne przyjęto parametry jazdy pociągu, a następnie dołączono do nich następujące parametry pojazdu trakcyjnego: moc i prędkość maksymalną pojazdu, stopień nasycenia i wzbudzenia magnetycznego, prąd rozruchu i kolejno masę wagonów. W tym celu program jazdy uzupełniono modelem pojazdu trakcyjnego, w którym charakterystyki trakcyjne opisano w zależności od wymienionych parametrów. Optymalizacji dokonano za pomocą standardowej procedury bezgradientowej. Wykazano, że optymalne parametry pojazdu trakcyjnego nie zależą od typu rozruchu.