scholarly journals Design of the reference model of the aero l-39 aircraft

2021 ◽  
Author(s):  
Ján Staňa ◽  
◽  
Filip Škultéty
Keyword(s):  
Reference Model ◽  
Computer Modelling ◽  
Functional Model ◽  
Basic Structure ◽  
Unmanned Aircraft ◽  
Strength Analysis ◽  
Structural Elements ◽  
Flight Tests ◽  
Reference Models ◽  
Successful Program

The object of the research of the paper is to design a reference model of an unmanned aircraft according to the model of the training jet Aero L 39. The work contains an analysis of the methods, procedures and typology used in the creation of reference models. Subsequently, the design of an unmanned vehicle was created using computer modelling, which was subjected to aerodynamic simulations and strength analysis. Aerodynamic performance was investigated on the airframe of the aircraft and strength analyses were determined on specific structural elements. After successful program tests, a functional model of the aircraft was built. The prerequisite was mainly aerodynamic analyses, which should determine with sufficient accuracy the basic structure of the model's flight. The result of solving the problem is a functional model of the aircraft, which is suitable for flight tests using appropriate hardware.

scholarly journals AGRICULTURAL MACHINERY AND IMPLEMENTS DESIGN PROCESS: GUIDELINES FOR SMALL AND MID-SIZED BUSINESSES

2016 ◽  
Vol 36 (1) ◽  
pp. 206-216 ◽  
Author(s):  
Renato L. Bergamo ◽  
Leonardo N. Romano
Keyword(s):  
Human Resources ◽  
Case Studies ◽  
Design Process ◽  
Process Modeling ◽  
Reference Model ◽  
New Products ◽  
Machine Design ◽  
Reference Models ◽  
Knowledge Domains ◽  
Modeling Formalism

ABSTRACT This study aims at presenting the process of machine design and agricultural implements by means of a reference model, formulated with the purpose of explaining the development activities of new products, serving as a guideline to coach human resources and to assist in formalizing the process in small and medium-sized businesses (SMB), i.e. up to 500 employees. The methodology used included the process modeling, carried out from case studies in the SMB, and the study of reference models in literature. The modeling formalism used was based on the IDEF0 standard, which identifies the dimensions required for the model detailing: input information; activities; tasks; knowledge domains; mechanisms; controls and information produced. These dimensions were organized in spreadsheets and graphs. As a result, a reference model with 27 activities and 71 tasks was obtained, distributed over four phases of the design process. The evaluation of the model was carried out by the companies participating in the case studies and by experts, who concluded that the model explains the actions needed to develop new products in SMB.

INSIM-FPT-3D: A Data-Driven Model for History Matching, Water-Breakthrough Prediction and Well-Connectivity Characterization in Three-Dimensional Reservoirs

2021 ◽  
Author(s):  
Hui Zhao ◽  
Wei Liu ◽  
Xiang Rao ◽  
Guanglong Sheng ◽  
Huazhou Andy Li ◽  
...  
Keyword(s):  
Simulation Model ◽  
History Matching ◽  
3D Model ◽  
Reference Model ◽  
Three Dimensional ◽  
Data Driven ◽  
Series Data ◽  
Reference Models ◽  
Water Breakthrough

Abstract The data-driven interwell simulation model (INSIM) has been recognized as an effective tool for history matching and interwell-connectivity characterization of waterflooding reservoirs. INSIM-FT-3D (FT: front tracking) was recently developed to upgrade the applicationdimension of INSIM series data-driven models from two-dimensional (2D) to three-dimensional (3D). However, INSIM-FT-3D cannot accurately infer the dynamic change of well-connectivity and predict well's bottom-hole pressure (BHP). The main purpose of this study intends to expand the capability of INSIM-FT-3D to empower for the assimilation of BHPs, the reliable prediction of water breakthrough and the characterization of dynamic interwell-connectivities. The default setting of well index (WI) in INSIM-FT-3D based on Peaceman's equation does not yield accurate BHP estimates. We derive a WI that can honor the BHPs of a reference model composed of a set of 1D connections. When history matching BHPs of a 3D reservoir, we show that the derived WI is a better initial guess than that obtained from Peaceman's equation. We also develop a flow-path-tracking (FPT) algorithm to calculate the dynamic interwell properties (allocation factors and pore volumes (PVs)). Besides, we discuss the relationship between the INSIM-family methods and the traditional grid-based methods, which indicates that the INSIM-family methods can calculate the transmissibility of the connection between coarse-scale cells in a more accurate manner. As an improvement of INSIM-FT-3D, the newly proposed data-driven model is denoted as INSIM-FPT-3D. To verify the correctness of the derived WI, we present a 1D problem and a T-shaped synthetic reservoir simulation model as the reference models. BHPs and oil production rates are obtained as the observed data by running these two reference models with total injection/production-rate controls. An INSIM-FPT-3D model is created by specifying the transmissibilities and PVs that are the same as those in the reference model. By applying the derived WIs in INSIM-FPT-3D, the resulting BHPs and oil rates obtained agree well with the reference model without further model calibration. Applying INSIM-FPT-3D to a synthetic multi-layered reservoir shows that we obtain a reasonable match of both BHPs and oil rates with INSIM-FPT-3D. Compared with the FrontSim model, the INSIM-FPT-3D model after history matching is shown to match the dynamic PVs from FrontSim reasonably well and can correctly predict the timing of water breakthrough. By allowing for the assimilation of BHP data, we enable INSIM-FPT-3D to history match a green field with limited production history and forecast the timing of water breakthrough. The improved INSIM-FPT-3D leads to more accurate characterization of the interwell connectivities.

Ontological Analysis of Reference Models

2011 ◽  
pp. 56-81 ◽  
Author(s):  
Peter Fettke ◽  
Peter Loos
Keyword(s):  
Information Systems ◽  
Reference Model ◽  
Point Of View ◽  
Model Quality ◽  
Analysis And Evaluation ◽  
Reference Models ◽  
Planning And Control ◽  
Sound Theory ◽  
Ontological Analysis ◽  
And Control

Within the information systems field, reference models have been known for many years. A reference model is a conceptual framework and may be used as a blueprint for information systems development. Despite the relevance of reference model quality, little research has been undertaken on their systematical analysis and evaluation. In this chapter, we describe how reference models can be analyzed from an ontological point of view. Such an analysis consists of four steps: 1) developing a transformation mapping, 2) identifying ontological modeling deficiencies, 3) transforming the reference model, and 4) assessing the results. The usefulness of our method will be demonstrated by analyzing Scheer’s reference model for production planning and control. Although our approach is based on sound theory, we argue that this approach is not inherently superior to other approaches of reference model analysis and evaluation.

Analysis and Validation of Learning Technology Models, Standards and Specifications

2010 ◽  
Vol 8 (2) ◽  
pp. 1-19 ◽  
Author(s):  
Jan M. Pawlowski ◽  
Denis Kozlov
Keyword(s):  
Reference Model ◽  
Model Analysis ◽  
Semantic Interoperability ◽  
Technology Enhanced Learning ◽  
Learning Technology ◽  
Reference Models ◽  
Competency Based ◽  
Open Content ◽  
Enhanced Learning

The paper presents a model for the analysis, comparison and validation of standards, specifications and in particular reference models in the field of Technology Enhanced Learning (TEL). The Reference Model Analysis Grid (RMAG) establishes categories of reference models and standards. Based on those categories, a set of criteria for the analysis and validation of standards was elaborated as a part of the ICOPER project that aims at interoperable open content for competency-based TEL. The analysis of standards in this context is targeted at developing a set of validated approaches that lead to a new reference model. Four standards were investigated, taking into account a broad range of aspects like practical and semantic interoperability and integration issues. In the case study, the authors analyzed both, the standards and specifications and the usefulness of the RMAG. The results of this case study can be used for further analyses of TEL standards as well as for reference models targeted at interoperability.

Lessons Learned in Reference Modeling

2011 ◽  
pp. 355-371 ◽  
Author(s):  
Wolfgang Hohnel ◽  
Daniela Krahl ◽  
Dirk Schreiber
Keyword(s):  
Success Factors ◽  
Reference Model ◽  
Lessons Learned ◽  
Practical Work ◽  
Time Constraints ◽  
Development Environment ◽  
Reference Models ◽  
Critical Success ◽  
Reference Modeling ◽  
Key Issues

A reference model is always developed in order to support a specific purpose. The development environment is setting the broader context. Limitations are not only set by size and experience of the modeler team or by budget and time constraints. The intended usage scenario also defines the fundamental contour of a reference model. During the practical work with reference models, a range of key issues has come up to increase the suitability of reference models for daily use. As the result of many projects, the authors have summarized the key issues and formulated critical success factors for reference modeling projects.

Evaluation of Reference Models

2011 ◽  
pp. 118-140 ◽  
Author(s):  
Ulrich Frank
Keyword(s):  
Process Model ◽  
Conceptual Models ◽  
Reference Model ◽  
Reference Models ◽  
Epistemological Perspective ◽  
Potential Applications ◽  
Evaluation Project ◽  
Specific Evaluation

Evaluating a reference model is a demanding task. Not only that reference models inherit the problems well known from the evaluation of conceptual models in general. Furthermore, their claim for general (re-) usability implies to take into account the possible variety of requirements and specific constraints within the set of potential applications. This chapter presents a method that is aimed at fostering a differentiated and balanced judgement of reference models. For this purpose, it takes into account various perspectives - among others an economic, an engineering and an epistemological perspective. It also includes a process model that demonstrates how to organize a specific evaluation project.

Process Model for an Empiracally Grounded Reference Model Construction

2011 ◽  
pp. 77-97 ◽  
Author(s):  
Frederik Ahlemann ◽  
Heike Gastl
Keyword(s):  
Literature Review ◽  
Process Model ◽  
Epistemological Beliefs ◽  
Reference Model ◽  
Real Life ◽  
Process Models ◽  
Research Projects ◽  
Ongoing Research ◽  
Reference Models ◽  
Proposed Model

This chapter stresses the importance of integrating empirical evidence in the construction process of reference models. With reference to the authors’ underly-ing epistemological beliefs, requirements for an empirically grounded process model are derived. Based on a literature review of existing process models and experience gained from three research projects, an advanced process model is proposed in order to provide concrete instructions that show how these require-ments can be met. Real-life examples from completed and ongoing research pro-jects are continuously integrated so as to contribute to the practicability of the proposed model for the reader.

scholarly journals Generating Reference Models for Structurally Complex Data

2013 ◽  
Vol 52 (05) ◽  
pp. 441-453 ◽  
Author(s):  
J. A. Lara ◽  
L. Martinez ◽  
A. Pérez ◽  
J. P. Valente ◽  
F. Alonso
Keyword(s):  
Time Series ◽  
Outlier Detection ◽  
Reference Model ◽  
Control Group ◽  
Model Generation ◽  
Correct Result ◽  
Complex Data ◽  
Reference Models ◽  
Event Based ◽  
Fold Cross Validation

SummaryObjectives: We present a framework specially designed to deal with structurally complex data, where all individuals have the same structure, as is the case in many medical domains. A structurally complex individual may be composed of any type of single-valued or multivalued attributes, including time series, for example. These attributes are structured according to domain-dependent hierarchies. Our aim is to generate reference models of population groups. These models represent the population archetype and are very useful for supporting such important tasks as diagnosis, detecting fraud, analyzing patient evolution, identifying control groups, etc.Methods: We have developed a conceptual model to represent structurally complex data hierarchically. Additionally, we have devised a method that uses the similarity tree concept to measure how similar two structurally complex individuals are, plus an outlier detection and filtering method. These methods provide the groundwork for the method that we have designed for generating reference models of a set of structurally complex individuals. A key idea of this method is to use event-based analysis for modeling time series.Results: The proposed framework has been applied to the medical field of stabilometry. To validate the outlier detection method we used 142 individuals, and there was a match between the outlier ratings by the experts and by the system for 139 individuals (97.8%). To validate the reference model generation method, we applied k-fold cross validation (k = 5) with 60 athletes (basket-ball players and ice-skaters), and the system correctly classified 55 (91.7%). We then added 30 non-athletes as a control group, and the method output the correct result in a very high percentage of cases (96.6%).Conclusions: We have achieved very satisfactory results for the tests on data from such a complex domain as stabilometry and for the comparison of the reference model generation method with other methods. This supports the validity of this framework.

scholarly journals A review of smart manufacturing reference models based on the skeleton meta-model

2020 ◽  
Vol 7 (3) ◽  
pp. 323-336 ◽  
Author(s):  
Soonhung Han
Keyword(s):  
Reference Model ◽  
Smart Manufacturing ◽  
Meta Model ◽  
Reference Models ◽  
Digital Twin ◽  
Dimensionality Analysis

Abstract Standards will allow interoperability among stakeholders in the upcoming super-connected world. A smart manufacturing reference model (SMRM) is under development inside JWG21 between ISO and IEC. Based on a dimensionality analysis and the skeleton meta-model, the eight proposed SMRMs are reviewed and compared. The SMRMs are classified according to the number of lifecycle axes and the number of dimensional axes. Also, how the concept of a digital twin can be accommodated in an SMRM is investigated.

Design for six sigma integrated product development reference model through systematic review

2020 ◽  
Vol 11 (4) ◽  
pp. 767-795 ◽  
Author(s):  
Marta Gomes Francisco ◽  
Osiris Canciglieri Junior ◽  
Ângelo Márcio Oliveira Sant’Anna
Keyword(s):  
Systematic Review ◽  
Product Development ◽  
Conceptual Model ◽  
Six Sigma ◽  
Web Of Science ◽  
Reference Model ◽  
Content Type ◽  
Reference Models ◽  
Design For Six Sigma ◽  
Database Platform

Purpose This paper aims to present a systematic review of design for six sigma (DFSS) methods applicable to the product development process (PDP) of durables goods and identify a research opportunity on the subject proposing integration of DFSS and a reference model for the PDP. In this way, through the analysis of the theoretical references identified in the scientific databases, it was possible to propose a conceptual model for the PDP oriented to the DFSS. Design/methodology/approach This paper is based on the theoretical framework presented in peer-reviewed scientific research papers during the period 2000 to 2018 on the theme DFSS applied in the PDP, as well as such as the product development tools/techniques and statistics addressed. By means of key words defined by the acronyms of DFSS methods (DMADOV, ICOV, DMEDI, IDOV, DDOV, PIDOV, DMADIC, DCCDI, DMADV, IDDOV, CDOV and DCOV), DFSS and the acronym DFSS. Applying Boolean expression during the conduction of the searches through the scientific evidence at the Brazilian scientific database platform (Capes database). This database platform is maintained by coordination for the improvement of higher education personnel, which including Emerald Insight (Emerald), Scopus (Elsevier), Science Direct, SpringerLink, Taylor Francis, Scielo (Web of Science), Wiley Online Library, Web of Science (Clarivate Analytics), etc. It was obtained, by means of the searches, 269 papers related to subject DFSS, of which 18 papers had been critically selected for the composition of a conceptual model for the process of development of product guided to the DFSS. Findings This study presents a review of the literature (systematic review and content analysis) on DFSS and its effectiveness for the PDP. The DFSS methodology is disseminated in the scientific literature through a variety of methods that are often mistaken for the six sigma methodology – DMAIC, which is directed toward process improvement. The PDP integrated with the DFSS concepts contributes to eliminating possible failures during the design of a new product, directing to reduce costs and improve the quality of the product and process. Practical implications This paper presents a literature review that guided to a proposal of a preliminary conceptual model DFSS focused on the process of product development with the purpose of being a friendly model that meets the dynamics of the organizations and the expectations of the consumers. Originality/value Through the systematic review and content analysis, it was possible to observe that the DFSS methods applied to product development are not related to the PDP reference models available in the literature. In this way, the fusion of the concepts of the DFSS methods and PDP reference models for the construction and proposition of a preliminary conceptual model DFSS oriented to the process of product development intends to contribute in the development of new products with the reduction of time, reduction of the cost, competitive price and consumer satisfaction.

Sign in / Sign up

Export Citation Format

Share Document