scholarly journals Optimization design of elastomeric locks

2020 ◽  
Vol S-I (2) ◽  
pp. 220-223
Author(s):  
V. Volodin ◽  
Keyword(s):  
Research Method ◽  
Design Methodology ◽  
Optimization Design ◽  
Optimization Problem ◽  
Strength Properties ◽  
Design Calculation ◽  
The Finite Element Method ◽  
Design Variant ◽  
Static Calculation

This paper discusses the development of small boats made of polymeric composites in combination with metal skeleton based on detachable elastic connections. Lock material was polyethylene with hyperelastic properties of an elastomer. Static calculation is performed as per the finite-element method in plane formulation taking into account contact, geometric and physical non-linearity, as well as implementing a step-wise procedure. Design calculation is performed as per the research method approximating the sub-task (quadratic programming). The paper presents calculations for the process of inserting/extracting a rigid bar with round free flange to/from the lock, with determination of maximum responses, strains and stresses of the insert. Variation of geometric parameters yielded a design variant with minimum load on the insert and the same strength properties as the initial design. The study also yielded the analytical design methodology for elastic detachable connections that combines the solutions to non-linear contact problem and the optimization problem.

Die Shape Optimal Design in Bimetal Extrusion by the Finite Element Method

1997 ◽  
Vol 119 (2) ◽  
pp. 143-150 ◽  
Author(s):  
S. M. Byon ◽  
S. M. Hwang
Keyword(s):  
Finite Element ◽  
Optimal Design ◽  
Optimization Problem ◽  
Element Model ◽  
The Finite Element Method ◽  
Constrained Optimization Problem ◽  
New Approach ◽  
The Core ◽  
The Finite Element Model

A new approach to die shape optimal design in bimetal extrusion of rods is presented. In this approach, the design problem is formulated as a constrained optimization problem incorporated with the finite element model, and optimization of the die shape is conducted on the basis of the design sensitivities. The approach is applied to the determination of the optimal die shapes for several combinations of the core and sleeve materials.

scholarly journals "Opti-Marine-Ware" (Optimization of Vessel's Parameters through Spreadsheet Model)

2009 ◽  
Vol 3 (2) ◽  
pp. 49-58
Author(s):  
Abhijit De ◽  
Ashish Kumar
Keyword(s):  
Objective Function ◽  
Optimization Design ◽  
Optimization Problem ◽  
Optimization Problems ◽  
Design Stage ◽  
Power Prediction ◽  
Power Requirement ◽  
Cost Of Transport ◽  
Spreadsheet Model

[THIS PAPER IS PLAGIARIZED FROM 'Artana, K. B. and  Ishida, K.(2003): The Determination of Optimum Ship’s Design and Power Prediction Using Spreadsheet Model, Journal of the JIME, Vol. 37, No. 6', http://www.mesj.or.jp/mesj_e/english/pub/ap_papers/pdf/2003AP7.pdf]The objective of this paper is to describe and evaluate a scheme of engineering-economic analysis for determining optimum ship's main dimensions and power requirement at basic design stage. We have divided the optimization problem into five main parts, namely, Input, Equation, Constraint, Output and Objective Function. The constraints, which are the considerations to be fulfilled, become the director of this process and a minimum and a maximum value are set on each constraint so as to give the working area of the optimization. The outputs (decision variables) are optimized in favor of minimizing the objective function. Microsoft Excel-Premium Solver Platform (a spreadsheet modeling tool is utilized to model the optimization problem). This paper is commenced by the description of the general optimization problems, and is followed by the model construction of the optimization. A case study on the determination of ship's main dimensions and its power requirement is performed with the main objective to minimize the Economic Cost of Transport (ECT). After simulating the model and verifying the results, it is observed that the spreadsheet model yields considerably comparable results with the main dimensions and power requirement data of the real operated ships (tanker). It is also experienced that this kind of optimization process needs no exhaustive efforts in producing programming codes, if the problem and the optimization model have been well defined.Keywords: Optimization; design; Ship power requirementDOI: 10.3329/jname.v3i2.919Journal of Naval Architecture and Marine Engineering 3(2006) 49-58 

LEGAL ISSUES REGARDING IMPOSITION OF E-FORM D AS A BASIS FOR DETERMINATION OF PREFERENTIAL TARIFFS IN ATIGA

2020 ◽  
Vol 4 (2) ◽  
Author(s):  
Aditya Subur Purwana ◽  
Wahyu Hidayat ◽  
Mursal Maulana
Keyword(s):  
Research Method ◽  
Descriptive Analysis ◽  
Legal Issues ◽  
Legal Certainty ◽  
Layer System ◽  
Legal Provisions ◽  
Directorate General ◽  
Domestic Law

Submission of Certificate of Origin (e-Form D) is conducted through a three-layer system named ASW Gateway, LNSW, and CEISA has raised issues related to the period/time of receipt of e-Form D given by customs authorities for the purposes of charging preferential tariffs in the ATIGA scheme. This article aims to analyze the legal certainty in submitting e-Form D to the customs authorities in the importing country, in this case, the Directorate General of Customs and Excise for the purpose of charging preferential tariffs, so that it can be in line with the presentation principle based on the ATIGA OCP and Indonesian domestic legal provisions. The research method used is a normative juridical approach with descriptive analysis and normative qualitative to draw conclusions. Based on the research, it was concluded that with regard to the submission of e-Form D, Customs and Excise Officials must have confidence based on factual evidence to determine whether the principle of submission of e-Form D has been accomplished or refused when an interruption in the ASW Gateway, LNSW or CEISA happened so the Customs Officer and Excise can determine tariffs based on OCP as well as domestic law in force in Indonesia.Keywords: ATIGA, Customs Authority, Directorate General of Customs and Excise, e-Form D, Tariffs Preference.ABSTRAK: Penyerahan SKA e-Form D dilakukan melalui tiga layer system yakni ASW Gateway, LNSW, dan CEISA memunculkan permasalahan terkait dengan jangka waktu/saat diterimanya e-Form D oleh otoritas kepabeanan untuk kepentingan pengenaan tarif preferensi dalam skema ATIGA. Penelitian bertujuan menganalisis kepastian hukum dalam penyerahan e-Form D ke otoritas kepabeanan di negara importir, dalam hal ini Direktorat Jenderal Bea dan Cukai untuk kepentingan pengenaan tarif preferensi, sehingga dapat sejalan dengan prinsip presentasi berdasarkan OCP ATIGA dan ketentuan hukum domestik Indonesia. Metode penelitian dilakukan dengan pendekatan yuridis normatif secara deskriptif analisis dan penarikan kesimpulan secara normatif kualitatif. Berdasarkan penelitian, disimpulkan bahwa berkenaan dengan penyerahan e-Form D, Pejabat Bea dan Cukai harus memiliki keyakinan berdasarkan bukti faktual untuk menentukan apakah prinsip penyerahan e-Form D sudah dipenuhi/tidak ketika terjadi gangguan pada ASW Gateway, LNSW atau CEISA sehingga Pejabat Bea dan Cukai dapat menentukan tarif berdasarkan OCP maupun hukum domestik yang berlaku di Indonesia. Kata Kunci: ATIGA, Direktorat Jenderal Bea dan Cukai, e-Form D, Otoritas Kepabeanan, Tarif Preferensi. 

PROFITABILITY ANALYSIS OF TERUBUK FARMING (SACCHARUM EDULE HASSKARL) IN SUBDISTRICT TOSA DISTRICT OF EAST TIDORE OF TIDORE ISLAND

2018 ◽  
Author(s):  
Suwandi S. Sangadji
Keyword(s):  
Data Collection ◽  
Research Method ◽  
Quantitative Method ◽  
Secondary Data ◽  
Primary Data ◽  
Profitability Analysis ◽  
Sample Method ◽  
Document Review ◽  
Revenue Production

The purpose of this researchment is to ascertain how wide the farming of species Saccharun Edule Hasskarl (terubuk) in sub district Tosa, district of East Tidore of Tidore Island through the indicator of the value revenue, production and selling prices so that the farmers will achieve The Break Event Point (BEP). The research method was used a quantitative method with the number of samples of 30 people. The determination of the sample method is using the census method or involving all members of the population into a sample of researchment. The secondary data collection was done by using library literature in the form of document review and relevant references to research object while primary data collection was done by using questionnaire. The data is using equation R /C Ratio, BEP Revenue, BEP Price, and BEP Production. Therefore from the results of the researchment it can be explained that the two of the thirty farmers come through the break event point, while the other twenty-eight farmers declared having a business that worth to be develop or experiencing profit, because the R/C ratio is above 1.0 with average profit reach Rp. 989.000, - per production / farmer.

scholarly journals Determination of Transverse Shear Stiffness of Sandwich Panels with a Corrugated Core by Numerical Homogenization

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1976
Author(s):  
Tomasz Garbowski ◽  
Tomasz Gajewski
Keyword(s):  
Transverse Shear ◽  
Shear Stiffness ◽  
The Finite Element Method ◽  
Homogenization Procedure ◽  
Plate Structures ◽  
Corrugated Board ◽  
Energy Equivalence ◽  
The Stability ◽  
Global Stiffness Matrix

Knowing the material properties of individual layers of the corrugated plate structures and the geometry of its cross-section, the effective material parameters of the equivalent plate can be calculated. This can be problematic, especially if the transverse shear stiffness is also necessary for the correct description of the equivalent plate performance. In this work, the method proposed by Biancolini is extended to include the possibility of determining, apart from the tensile and flexural stiffnesses, also the transverse shear stiffness of the homogenized corrugated board. The method is based on the strain energy equivalence between the full numerical 3D model of the corrugated board and its Reissner-Mindlin flat plate representation. Shell finite elements were used in this study to accurately reflect the geometry of the corrugated board. In the method presented here, the finite element method is only used to compose the initial global stiffness matrix, which is then condensed and directly used in the homogenization procedure. The stability of the proposed method was tested for different variants of the selected representative volume elements. The obtained results are consistent with other technique already presented in the literature.

Parameter study and optimization design of a hat oblique tunnel portal

2021 ◽  
pp. 095440972110140
Author(s):  
Zijian Guo ◽  
Tanghong Liu ◽  
Wenhui Li ◽  
Yutao Xia
Keyword(s):  
High Speed ◽  
Optimization Design ◽  
Pareto Front ◽  
Optimization Problem ◽  
Optimization Method ◽  
Design Parameters ◽  
Parameter Study ◽  
Buffer Structure ◽  
Tunnel Entrance ◽  
The Ideal

The present work focuses on the aerodynamic problems resulting from a high-speed train (HST) passing through a tunnel. Numerical simulations were employed to obtain the numerical results, and they were verified by a moving-model test. Two responses, [Formula: see text] (coefficient of the peak-to-peak pressure of a single fluctuation) and[Formula: see text] (pressure value of micro-pressure wave), were studied with regard to the three building parameters of the portal-hat buffer structure of the tunnel entrance and exit. The MOPSO (multi-objective particle swarm optimization) method was employed to solve the optimization problem in order to find the minimum [Formula: see text] and[Formula: see text]. Results showed that the effects of the three design parameters on [Formula: see text] were not monotonous, and the influences of[Formula: see text] (the oblique angle of the portal) and [Formula: see text] (the height of the hat structure) were more significant than that of[Formula: see text] (the angle between the vertical line of the portal and the hat). Monotonically decreasing responses were found in [Formula: see text] for [Formula: see text] and[Formula: see text]. The Pareto front of [Formula: see text] and[Formula: see text]was obtained. The ideal single-objective optimums for each response located at the ends of the Pareto front had values of 1.0560 for [Formula: see text] and 101.8 Pa for[Formula: see text].

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