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Modelling Energy Efficiency for Voyage of Chemical Tanker Vessel (CTV) Operating in Calm Weather Condition
Collins Emeka Amadi,
Kelvin Datonye Henry Bob Manuel,
Daniel Tamunodukebipi,
Onuh Chukwuka Humphery
Issue:
Volume 7, Issue 4, December 2022
Pages:
130-135
Received:
5 September 2022
Accepted:
1 October 2022
Published:
28 October 2022
DOI:
10.11648/j.ajset.20220704.11
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Abstract: An increased study into improving ship energy management has been prompted by worldwide worries about the high cost of bunker fuel. The study present both empirical and analytical approaches considered in predicting the vessel fuel consumption and the hull resistance of a chemical tanker vessel on a voyage from Escavos, Delta to Lagos port (Apapa) in Nigeria enroute Lome port (Togo) and Tiko port (Cameroon). The speed and route of a ship must be determined by balancing numerous objectives such as cost, arrival time, and cargo safety. DMarine Book, a computer model that employs the Holtrop technique to calculate vessel power and resistance power was designed to estimate the degree of energy efficiency by the deployment of energy efficient technologies. The semi empirical model was used in the development of C shape code for simulating energy efficiency. The approach was used to develop the model for predicting the vessel resistance, EEOI for a given fuel consumption hence reducing the overall emission level of the vessel as part of the implementation of ship energy efficiency management plan (SEEMP). The built software (DMarine Book) can be used as a decision tool for operators of the chemical Tanker vessel onboard. Under calm weather conditions, operating the chemical tanker vessel at a speed of 12.18 knots (economical speed) rather than a speed of 14.5 knots (rated speed) resulted in a reduction in vessel resistance of about 159.17kn and decrease in fuel consumption. The results are considered consistent with those of other authors who employed various models and similar operating conditions and came to similar conclusions. When running a vessel at an economically efficient speed, the Energy Efficiency Operational Indicator (EEOI) calculation shows a decrease in EEOI and Carbon Dioxide (CO2) emission.
Abstract: An increased study into improving ship energy management has been prompted by worldwide worries about the high cost of bunker fuel. The study present both empirical and analytical approaches considered in predicting the vessel fuel consumption and the hull resistance of a chemical tanker vessel on a voyage from Escavos, Delta to Lagos port (Apapa) ...
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Performance Analysis of Non Linear Field Oriented Controlled Induction Motor Drive for Improved Performance - Effect of Intermittent Loading
Ekwuribe James Michael,
Okoro Christopher Kalu
Issue:
Volume 7, Issue 4, December 2022
Pages:
136-146
Received:
1 October 2022
Accepted:
19 October 2022
Published:
29 October 2022
DOI:
10.11648/j.ajset.20220704.12
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Abstract: Attempt has been made in previous works to improve the steady state and dynamic performances of the vector controlled induction motor drives. The Input-output (I/O) linearization and decoupling technique which are based on the concepts of differential geometry and vector control has been used in the decoupling of speed or torque from the flux of induction motor drives. This paper investigates the effects of non-linearity on the performance of field oriented control of induction motor drive at intermittent loading, Nonlinear control are better seen implemented in large dynamic systems invoking non linearity. the effects of intermittent loading at no load, full, 10%, 20%, 50% and 80% loading where checked on the speed and electromagnetic torque of the induction motor being controlled, stator current and rotor current were also important parameters affected by non-linearity in control under intermittent loading. The results obtained gave a detailed comparison of the distortions present in motor control when not properly controlled. A comparative study of the system under loading conditions were checked under control for linear and non-linearity. Matlab/Simulink was used to model the induction motor drive and also simulate the dynamic performance of the system as load is being varied. The robustness of Matlab/Simulink was used to enable efficient intermittent loading at various points of the simulation, the data logout tool of Matlab/Simulink were also used for data collection analysis and comparison.
Abstract: Attempt has been made in previous works to improve the steady state and dynamic performances of the vector controlled induction motor drives. The Input-output (I/O) linearization and decoupling technique which are based on the concepts of differential geometry and vector control has been used in the decoupling of speed or torque from the flux of in...
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On the Evaluation of the Neural Network Khartoum Geoid Model
Kamal Abdellatif Sami,
Ammar Mohammed Maryod Aborida
Issue:
Volume 7, Issue 4, December 2022
Pages:
147-151
Received:
15 September 2022
Accepted:
20 October 2022
Published:
4 November 2022
DOI:
10.11648/j.ajset.20220704.13
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Abstract: This study was carried out to establish and evaluate an Artificial Neural Networks (ANN) geoid model for the Khartoum State. In the first stage the geometrical geoid heights were obtained from the differences between observed ellipsoidal heights and known orthometric heights of 48 geodetic Ground Control Points (GCP) in the study area. This followed by generating an ANN geoid model to extract the geoid heights from 42 ground control stations in the same study area in the Khartoum State. The main objective of this research study is to apply an ANN to model the Geoid surface using the back propagation algorithm in Khartoum state, through supervised training by geoidal undulations values. The WGS84 GPS/levelling geoid is computed then their results were used for comparison and evaluation of the determined ANN Geoid surface. In this study the geometrical geoid model was determined using the well-known geometrical geoid determination approach taking consideration of the distribution of the existing vertical control points in Khartoum area, with an intention of determining the orthometric heights of any point of unknown heights with uncertainties of less than 5cm. The ANN geoid uncertainties were evaluated and tested at 6 geodetic ground control points. The average difference between the derived geoid heights obtained from the geometrical geoid model, and their corresponding ANN geoid heights was found to be in the range of ±3 cm. Based on the test results of the statistical analysis and the study of a trained artificial neural networks model, the authors were able to estimate the geoid model with acceptable accuracy and can interactively be available for end users. This study showed that, the geoid heights in Khartoum State can be determined with the ANN method with typical accuracy of better than 5cm.
Abstract: This study was carried out to establish and evaluate an Artificial Neural Networks (ANN) geoid model for the Khartoum State. In the first stage the geometrical geoid heights were obtained from the differences between observed ellipsoidal heights and known orthometric heights of 48 geodetic Ground Control Points (GCP) in the study area. This followe...
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Numerical Analysis of Circular, Square, and Rectangular Composite Columns Under Axial and Torsional Loads
Issue:
Volume 7, Issue 4, December 2022
Pages:
152-166
Received:
14 October 2022
Accepted:
14 November 2022
Published:
23 November 2022
DOI:
10.11648/j.ajset.20220704.14
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Abstract: This paper presents a numerical analysis of different sections of circular, square, and rectangular composite columns subjected to axial and torsional loads to characterize the composite columns section performance for different purposes of construction. To accomplish the objective of this study, a parametric examination was conducted. Nine different types of composite columns were investigated. A [circular, square, rectangular] composite column with concrete-filled, with reinforcement bars, and with embedded steel profile were investigated in detail under axial load only and combined effect of axial and torsional loads separately. The strength of composite column materials considered uniformly for concrete, Steel profile, Reinforcement bars in quality, and utilized to determine their impacts under ultimate axial load capacity was examined. The composite columns under load impacts of various percentage 40%, 50% and 60% of its ultimate axial load capacity (P) with a constant magnitude were numerically analyzed. In this paper, different types of composite columns are taken for analysis by making bottom end fully fixed and another top end as pinned support, while the concentrated load and torsion are applied at this point for loading analysis. The FEM software called Abaqus was used for modeling and analysis of composite column by method of finite element considering three-dimensional models for all composite columns’ materials. Concentrated load and Torsion will be applied on the top end of the composite column at the reference point constraint at top-end by coupling. The result analysis is demonstrated to determine the impacts of various levels of axial loads on the behaviour of columns subjected to axial and torsional loading on different composite material, and assessing high and low stress and strain zones, loading compression, rotation and twisting structural properties was investigated.
Abstract: This paper presents a numerical analysis of different sections of circular, square, and rectangular composite columns subjected to axial and torsional loads to characterize the composite columns section performance for different purposes of construction. To accomplish the objective of this study, a parametric examination was conducted. Nine differe...
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