Temat: trim analysis - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A nonlinear dynamic inversion-based neurocontroller for unmanned combat aerial vehicles during aerial refuelling
Autorzy:: Pedro, J. O.
Panday, A.
Dala, L.
Tematy:: trim analysis
stability analysis
neurocontroller
UCAV
aerial refuelling
nonlinear dynamic inversion
analiza stateczności
inwersja dynamiczna; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/330328.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the development of modelling and control strategies for a six-degree-of-freedom, unmanned combat aerial vehicle with the inclusion of the centre of gravity position travel during the straight-leg part of an in-flight refuelling manoeuvre. The centre of gravity position travel is found to have a parabolic variation with an increasing mass of aircraft. A nonlinear dynamic inversion-based neurocontroller is designed for the process under investigation. Three radial basis function neural networks are exploited in order to invert the dynamics of the system, one for each control channel. Modal and time-domain analysis results show that the dynamic properties of the aircraft are strongly influenced during aerial refuelling. The effectiveness of the proposed control law is demonstrated through the use of simulation results for an F-16 aircraft. The longitudinal neurocontroller provided interesting results, and performed better than a baseline nonlinear dynamic inversion controller without neural network. On the other hand, the lateral-directional nonlinear dynamic inversion-based neurocontroller did not perform well as the longitudinal controller. It was concluded that the nonlinear dynamic inversion-based neurocontroller could be applied to control an unmanned combat aerial vehicle during aerial refuelling.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The second trim correction in Draught Survey procedure – accuracy analysis
Autorzy:: Wawrzyński, Wojciech
Tematy:: accuracy analysis
ship stability
trim
Draught Survey procedure
Electronic Quality Shipping Information System
EQUASIS
draught at midship
Bonjean Scale
Hydrostatic Table; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/59252773.pdf Link otwiera się w nowym oknie
Opis:: The basic method for determining the mass of dry bulk cargo, loaded on the ship or unloaded from the ship, is the Draught Survey procedure. This procedure is quite simple, however is highly susceptible to mistakes and accidental errors. Moreover, it is also affected by some systematic errors. The difference between the mas of cargo at the loading and discharging port (cargo shortage) bigger than 0.5% then such cargo shortage generally becomes the subject of a Cargo Claim. In this study the systematic error that concerns the formula of second trim correction in Draught Survey procedure is discussed. The results of calculations performed with the commonly used the second trim correction formula are compared with the results obtained during calculations with the use of Bonjean Scale. The calculations carried out with the use of Bonjean Scale, have been validated based on the ship’s documentation. For the purpose of this study the small bulk carrier was selected. The results of performed calculations shows the significance of the systematic error of the second trim correction for a ship with higher trim values.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Development of a supplemental learning material in mathematics for Seamanship (Trim and Stability)
Autorzy:: Gabasa, Clarence Kay Soliva
Melliza, Teodosio S.
Tematy:: Maritime Education and Training
MET
trim
maritime safety education
education of navigators
stability
College of Maritime Education
CME
analysis
design
development
implementation and evaluation
ADDIE
Engage, Explore, Explain and Evaluation
4E; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/59194149.pdf Link otwiera się w nowym oknie
Opis:: This developmental research aimed to produce a supplemental learning material in Mathematics for Seamanship (Trim and Stability) using the ADDIE model. Mathematics concepts were determined through content analysis by examining the Seamanship Instructor’s Guide and class handouts and validated by two maritime teachers of JBLFMU-Arevalo. An outline of the lessons was drafted from the results of the content analysis. The supplemental learning material was then developed using the 4E Instructional model – Engage, Explore, Explain, and Evaluate. Furthermore, simple random sampling was used to select the 30 BSMT 2 students taking up Seamanship during the second semester of school year 2018-2019 as respondents. Meanwhile, a purposive sampling was used to determine 18 experts – 12 in Maritime Education and 6 in Mathematics. A researcher-made questionnaire that underwent validation and reliability testing was utilized to gather data. The statistical tools used were frequency, mean, and standard deviation. The results of the study showed that the mathematics concepts embedded in Seamanship lessons were: (1) Integers, (2) Fractions, (3) Decimals, (4) Percent, (5) Algebra, and (6) Trigonometry. It was also found that students have a “Very High” satisfaction towards the supplemental material when taken as a whole and in terms of physical aspects, objectives, learning activities, evaluation procedure, and usefulness. On the other hand, experts believed the supplemental learning material has a “Very High” acceptability when taken as a whole and in terms of physical aspects, objectives, and usefulness. However, experts found that it only has a “High” acceptability in terms of learning activities, and evaluation procedure. Thus, the supplemental learning material in Seamanship is appropriate, relevant, and useful in general and in terms physical aspects, objectives, learning activities, and evaluation procedure. It has also met the expectations and standards of chosen experts as reflected on their evaluation rating. Furthermore, the supplemental learning material may be subjected to the scrutiny of experts in the production of instructional materials and may be edited, if the expert suggests to do so. The university may use this supplemental learning material in improving students’ mastery of important mathematics lessons needed in Seamanship. Similarly, future researchers may conduct an experimental study to determine if the use of this supplemental learning material may improve students’ academic performance in Seamanship or another developmental research to produce similar supplemental learning materials for other maritime and general education subjects.
Dostawca treści:: Biblioteka Nauki

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