scholarly journals An IDM-Based Approach for Information Requirement in Prefabricated Construction

2020 ◽  
Vol 2020 ◽  
pp. 1-21 ◽  
Author(s):  
Zhao Xu ◽  
Jimmy Abualdenien ◽  
Hao Liu ◽  
Rui Kang
Keyword(s):  
Design Process ◽  
Collaborative Work ◽  
Information Delivery ◽  
Database Management System ◽  
Accurate Information ◽  
Process Maps ◽  
Building Models ◽  
Actual Design ◽  
Project Participants ◽  
Information Delivery Manual

Prefabricated construction promotes providing better productivity and project results. Building models, including their elements’ fabrication details, are complex structures that need accurate information delivery among the project participants and their partial designs. This paper extends the IFC data model to support prefabricated construction. Also, it discusses the advantages of systematically managing exchange requirements in a database to facilitate generating IDM (Information Delivery Manual). The paper first introduces a BIM-based collaborative work mode by sharing and extracting the model views. The core of the sharing is the establishment of view exchange standard about the linked model and the definition of exchange requirements based on the design process, leading to the formulation of the IDM standard again from the perspective of the actual design. Process maps covering architecture, structure, plumbing, mechanical engineering, and electrical engineering are made to show how to realize BIM-based collaborative work. Then the exchange requirements referred to the object and attribute of the BIM model which should be delivered in a special phase are defined in particular tables. To facilitate the automation of managing and exchanging requirements, a database management system is designed with its corresponding user-interface, which enhances the collaboration and delivery throughout the project life cycle. The proposed approach supports better information reuse and delivery among the project participants.

A Novel Ship Subdivision Method and its Application in Constraint Management of Ship Layout Design

2011 ◽  
Vol 27 (03) ◽  
pp. 137-145 ◽  
Author(s):  
Deniz de Koningh ◽  
Herbert Koelman ◽  
Hans Hopman
Keyword(s):  
Design Process ◽  
Early Stage ◽  
A Priori ◽  
Layout Design ◽  
Management Program ◽  
Management Tool ◽  
Constraint Management ◽  
Damage Stability ◽  
Actual Design ◽  
The Impact

Conventionally, the rooms and spaces of a ship are either modeled as volumetric entities, or with the aid of bulkheads and decks. According to our knowledge, no simple representation exists where both entities can be modeled independently, and where automated conversion from one view (volumetric) to the other (planes) is possible. This paper introduces a simple yet effective approach, where a ship designer can mix the use of volumes and planes in any fashion. Furthermore, this modeling method is applied in a novel tool to manage ship subdivision constraints. As quite a few numerical constraints are known a priori, they can be defined in a list and assigned to specific subdivision elements. Examples are bulkhead locations or required tank volumes or deck areas. A constraint management tool is developed that evaluates the ship layout design during the design process. The designer will be able to modify or add constraints, and the tool will support the designer by managing these constraints during the design process. If the hull form changes, all submitted rules will be updated according to the new main particulars. If one of the constraints does not comply, an adjustment or alternative can be chosen at that moment and the impact of this change is directly visible. The designer can also ask the tool to provide a ship layout design that complies best with the constraints entered. When the Constraint Management program is used, a feasible ship compartment design can be made in a quick manner and the designer is kept from making errors. This means that a correct ship layout model is available on which probabilistic damage stability calculations and weight estimations can be performed in an early stage. This method has been implemented in a computer program, so actual design examples are discussed.

The Parameter Selection System of Vehicle Overall Design Based on Cooperation and Specialty

2008 ◽  
Vol 44-46 ◽  
pp. 261-266
Author(s):  
L. Zhang ◽  
Xin Yu Shao ◽  
Liang Gao ◽  
Wu Tao
Keyword(s):  
Design Process ◽  
Collaborative Design ◽  
Optimal Parameter ◽  
Pso Algorithm ◽  
Parameter Selection ◽  
Decision Makers ◽  
Selection System ◽  
Overall Design ◽  
Decision Optimization ◽  
Actual Design

The process of parameter choosing in vehicle overall design is a process of collaboration design, and is also a process of group decision optimization. The degree of cooperation and level of experts become the crucial standards in Computer Supported Collaborative Design because many decision-makers participating in the design process have different expertise and goals. This paper describes vehicle overall design parameter selection with a Multi-Objective Decision-Making optimization model, presents the concepts of non-cooperation degree and non-specialty degree, and uses entropy to describe the model. Furthermore, Particle Swarm Optimization (PSO) algorithm is employed to resolve the model and to get optimal parameter. In addition, we propose an effective expert system based on the model and actual design process. Finally, the effect of the non-cooperation degree and non-specialty degree on the result is discussed and the sensitivity of the proposed system analyzed in this paper.

Bridging the Gap between User-Centered Intentions and Actual Design Practice

1996 ◽  
Vol 40 (19) ◽  
pp. 967-971 ◽  
Author(s):  
David D. Woods ◽  
Emily S. Patterson ◽  
James M. Corban ◽  
Jennifer C. Watts
Keyword(s):  
Design Process ◽  
Human Performance ◽  
Investment Strategy ◽  
Design Concept ◽  
Design Practice ◽  
Modeling Error ◽  
Actual Design ◽  
Computer Based ◽  
The Relationship ◽  
User Centered

In this paper, we introduce a notation that highlights necessary elements in a practice-centered design process and which can be used to describe a set of common errors committed by design organizations leading to computer-based systems that create new burdens for practitioners. These common design errors result from an organizational tendency to underinvest in modeling error and expertise and using prototypes to discover requirements. The former underinvestment can lead to designs based on uninformed, underspecified, and unexamined models of the relationship between technology and human performance. The latter can lead to commitment to a design concept before fully exploring the range of possible solutions. We suggest ways to avoid these problems by setting forth a balanced organizational investment strategy that would enhance the possibilities for the development of useful systems.

Initial conceptual design and wing aerodynamic analysis of a solar power-based UAV

2014 ◽  
Vol 118 (1203) ◽  
pp. 540-554 ◽  
Author(s):  
W. Harasani ◽  
M. Khalid ◽  
N. Arai ◽  
K. Fukuda ◽  
K. Hiraoka
Keyword(s):  
Saudi Arabia ◽  
Conceptual Design ◽  
Design Process ◽  
Weather Condition ◽  
The Sun ◽  
Solar Panels ◽  
Design Features ◽  
Solar Cell Performance ◽  
Actual Design ◽  
Solar Powered

Abstract King Abdul Aziz University of Saudi Arabia (KAU) and Tokai University in Japan have collaborated to design and manufacture a solar powered unmanned air vehicle (UAV), Sun Falcon, which has capability of continuous one day fight with intended design extension towards night flight. The project is a student-driven endeavour involving some 30 students. Both universities are equally involved in the actual design studies of the performance characteristics, aerodynamic design, propulsion and structural analysis. Tokai University is in charge of the actual on-site supervision and examination of on-going manufacturing processes and ultimate fabrication of the prototype model. The conceptual design of the Sun Falcon was meticulously worked out in consideration of the operational mission, which included such flight characteristics as the cruising velocity, flight altitude, payload, flight time, rate of climb, power requirements and so on. The weather condition patterns in Saudi Arabia, which remained fairly supportive of the solar cell performance, were also deemed crucial in the design process. However, the design of a solar plane had other challenges in terms of power unit accommodation and payload consideration in comparison to other conventional UAVs. In this paper, an outline of the design features of the Sun Falcon is presented and other notable design features particular to solar UAVs are discussed. It was learnt in this exercise that the selection of the base aerofoil is perhaps one of the most important design items, as the Reynolds number for such UAVs understandably drops notably lower than conventional aeroplanes and such features as the camber curvature and wing area must cater for the installation of solar panels whose size, strength and quantity must respect local weather conditions. For the Sun Falcon, the actual design process examined two candidate aerofoils FX74-CL5-140 (FX74) and SD7037-092-88(SD7037) both of which were abundantly suitable for furnishing the required aerodynamic characteristics. SD7037 was ultimately chosen as it provided the best geometry and camber line in terms of accommodation and placement of the solar panels. Further scrutiny demonstrated that this latter aerofoil provided better take-off performance and superior L/D behaviour under cruise conditions. In order to check out the aerodynamic performance in general and overall stability and control characteristics, a preflight test under battery power (a 2,500 mAh li-po 4-cell 14·8v) was achieved on 4 June 2013. Other solar powered based tests are currently under way at present.

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