scholarly journals Methodology for the Concept Design of Locally Reinforced Composites

2021 ◽  
Vol 11 (16) ◽  
pp. 7246
Author(s):  
Julius Moritz Berges ◽  
Georg Jacobs ◽  
Sebastian Stein ◽  
Jonathan Sprehe
Keyword(s):  
Cost Estimation ◽  
Structural Design ◽  
Early Stage ◽  
Parameter Study ◽  
Great Effort ◽  
Concept Design ◽  
Cost Weight ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
The Cost

Locally load-optimized fiber-based composites, the so-called tailored textiles (TT), offer the potential to reduce weight and cost compared to conventional fiber-reinforced plastics (FRP). However, the design of TT has a higher complexity compared to FRP. Current approaches, focusing on solving this complexity for multiple objectives (cost, weight, stiffness), require great effort and calculation time, which makes them unsuitable for serial applications. Therefore, in this paper, an approach for the efficient creation of simplified TT concept designs is presented. By combining simplified models for structural design and cost estimation, the most promising concepts, regarding the cost, weight, and stiffness of TT parts, can be identified. By performing a parameter study, the cost, weight, and stiffness optima of a sample part compared to a conventional FRP component can be determined. The cost and weight were reduced by 30% for the same stiffness. Applying this approach at an early stage of product development reduces the initial complexity of the subsequent detailed engineering design, e.g., by applying methods from the state of the art.

Approach for Effective Design and Cost Estimation of New built / Conversion FPSO (2014)

2014 ◽  
Author(s):  
Upendra Malla ◽  
Krishna M. Karri
Keyword(s):  
Cost Estimation ◽  
Structural Design ◽  
Effective Means ◽  
Step Method ◽  
Support Design ◽  
Field Development ◽  
Early Stages ◽  
The Cost ◽  
Offshore Field ◽  
Effective Design

Floating Production Storage and Offloading (FPSO) sizing and cost estimation has become a challenging task at the early stages of offshore field development. During the early stages of field development designer needs to size and estimate cost in order to decide feasibility of the project. This paper describes a step by step method used to size and estimate the cost of a new built (or) converted FPSO based on basic engineering, existing FPSO data and corresponding metocean criteria for a particular location. This step by step approach covers FPSO sizing, hull structural design, mooring sizing, topsides support design and steel renewal using offshore classification rules and regulations. FPSO cost is estimated based on the design particulars (i.e. hull weights, FPSO particulars, mooring sizes etc.) and current market unit rates. This approach is an effective means to size and estimate cost of an FPSO at early stages of field development which saves overall time and cost for a client.

Structural Design of Carbon Fiber-reinforced Plastics Barrel for Space Remote Sensing Camera

2019 ◽  
Vol 48 (8) ◽  
pp. 822001
Author(s):  
任国瑞 REN Guo-rui ◽  
李创 LI Chuang ◽  
王炜 WANG Wei ◽  
解永杰 XIE Yong-jie ◽  
许亮 XU Liang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Carbon Fiber ◽  
Structural Design ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

scholarly journals Cost Modelling from the Contractor Perspective: Application to Residential and Office Buildings

2021 ◽  
Author(s):  
Francisco Pereira Monteiro ◽  
Vitor Sousa ◽  
Inês Meireles ◽  
Carlos Oliveira Cruz
Keyword(s):  
Financial Crisis ◽  
Cost Estimation ◽  
Early Stage ◽  
Unit Cost ◽  
Office Buildings ◽  
2008 Financial Crisis ◽  
Stage Of Development ◽  
Cost Modelling ◽  
The 2008 Financial Crisis ◽  
The Cost

For the majority of the contractual arrangements used in construction projects, the owner is not responsible for the cost deviations due to the variability of labor productivity or material price, amongst many other aspects. Consequently, the cost performance of a project may be entirely distinct for the owner and the contractor. Since the majority of the quantitative research on cost estimation and deviation found in the literature adopts the owners’ perspective, this research provides a contribution towards modelling costs and cost deviation from a contractors’ perspective. From an initial sample of 13 residential building and 10 office building projects, it was possible to develop models for cost estimation at the early stage of development including both endogenous and exogenous variables. Although the sample is relatively small, the authors were able to fully analyze all the cost data, using no secondary sources of data (very frequent in cost modelling studies). The statistically significant variables in the cost estimation models were the areas above and below ground and the years following the 2008 financial crisis, including the international bailout (2011-2014) period. For estimating the unit cost, a nonlinear model was obtained with the number of underground and total floor, the floor ratio and the years following the 2008 financial crisis, including the international bailout (2011-2014) period as predictors. For the office buildings, it was also found a statistically significant correlation between the cost deviation and the number of underground floors.

scholarly journals Estimasi Biaya Konseptual Pada Jembatan Beton Bertulang Dengan Metode Indek Biaya

2017 ◽  
Vol 13 (2) ◽  
pp. 105
Author(s):  
Bagyo Mulyono ◽  
Paulus Setyo Nugroho
Keyword(s):  
Cost Estimation ◽  
Early Stage ◽  
Cost Model ◽  
Construction Project ◽  
Public Works ◽  
Cost Index ◽  
Reinforced Concrete Bridge ◽  
Construction Project Cost ◽  
The Cost ◽  
Available Information

<p class="DRAbstrak">Cost estimation is the art of estimating the amount of cost required for an activity based on available information. The conceptual cost estimate is an early stage in planning a construction project. This estimate provides the cost that must be budgeted for a construction project. Cost conceptual estimates have low accuracy because the time of calculation and available information is limited. This study aims to obtain a conceptual model of the conceptual cost of short-spaced bridges. The method used is the cost index. The cost index is a figure indicating the cost per m2 of bridges at a given time. The required data are contract documents and drawings design that are built in 2012 - 2015 in Banyumas residency area. Span of bridge 4 - 38.8 meters and width of bridge 2 - 7 meters with caisson  foundation. The data were obtained from Dinas Bina Marga and Public Works Agency. The results showed that the conceptual cost model of reinforced concrete bridge with caisson foundation was BJiL = (100.540.56t2-404.528.636,58t + 406.914.286.088,58) x P x W, with t = year, P = span bridge, and W = bridge width. The error value of validation of this model is 2.31%.</p>

scholarly journals Automatic Estimation System of Building Frames Integrated with Structural Design Information (AutoES)

2015 ◽  
pp. 224-231
Author(s):  
Chaeyeon Lim ◽  
Donghoon Lee ◽  
Won-Kee Hong ◽  
Sunkuk Kim
Keyword(s):  
Cost Estimation ◽  
Structural Design ◽  
Construction Costs ◽  
Building Frames ◽  
Design Information ◽  
Automatic Estimation ◽  
Project Participants ◽  
Estimation System ◽  
The Cost ◽  
Structural Engineers

The project participants, including clients, architects, structural engineers and contractors would want to know accurate construction costs as soon as the design is completed. However, it may take at least several weeks for the cost estimation after the structural design and drawings are completed, depending on the project scale or size. Quantity surveying in manual is time-consuming and taken by lots of effort. Even if computerized software is used, it takes a lot of time to insert structural design information to the software. In addition, the estimated cost may result in inaccurate quantity owing to the drawing errors or quantity surveyors’ mistake, as well as it is not an exact quantity for actual construction, exposing numerous problems at the construction phase. For instance, to accurately estimate the quantity of rebar, some additional effort is required such as preparing the bar bending schedule. Such problems occur by the communication gap and viewpoint difference among project participants who perform structural designs, draft the structural drawings and estimate quantity. But, if structural design information can be automatically received for quantity estimation, an exact quantity can be estimated without omission or errors. To solve those problems, this study proposes automatic estimation System of building frames integrated with structural design information (AutoES). Using the algorithms provided by AutoES, the task of cost estimation can be accomplished with an exact bill of quantity including a bar bending schedule without errors, mistakes, or omission within a week, which used to take at least 4 weeks.

scholarly journals Early Cost Estimation in Customized Furniture Manufacturing Using Machine Learning

2021 ◽  
Vol 11 (1) ◽  
pp. 28-33
Author(s):  
O. Kurasova ◽  
◽  
V. Marcinkevičius ◽  
V. Medvedev ◽  
B. Mikulskienė
Keyword(s):  
Machine Learning ◽  
Cost Estimation ◽  
Early Stage ◽  
Machine Learning Techniques ◽  
Design Stage ◽  
Early Design Stage ◽  
Furniture Manufacturing ◽  
Learning Techniques ◽  
Key Factor ◽  
The Cost

Accurate cost estimation at the early stage of a construction project is a key factor in the success of most projects. Many difficulties arise when estimating the cost during the early design stage in customized furniture manufacturing. It is important to estimate the product cost in the earlier manufacturing phase. The cost estimation is related to the prediction of the cost, which commonly includes calculation of the materials, labor, sales, overhead, and other costs. Historical data of the previously manufactured products can be used in the cost estimation process of the new products. In this paper, we propose an early cost estimation approach, which is based on machine learning techniques. The experimental investigation based on the real customized furniture manufacturing data is performed, results are presented, and insights are given.

scholarly journals Concept Design of a Bulk Carrier Retrofit with LNG Fuel

2019 ◽  
Author(s):  
I CK Tam ◽  
A Kr Dev ◽  
CW Ng ◽  
L Deltin ◽  
I Stoytchev
Keyword(s):  
Cost Estimation ◽  
Life Cycle Cost ◽  
Payback Period ◽  
Concept Design ◽  
Bulk Carrier ◽  
Attractive Option ◽  
Lng Fuel ◽  
The Cost ◽  
Selection Of

This report showed a case study of a mini-cape size bulk carrier of being retrofitted for Liquefied Natural Gas (LNG) fuel and the selection of its new fuel tanks to meet the stringent emissions requirement. The vessel was equipped with a dual fuel ready (DFR) engine before the retrofit. Engine manufacturer will supply and replace engine parts for LNG fueled operations with no significant modification of the engine structure required. The detailed engineering design considerations were studied with cost reduction and minimum downtime set as ultimate objectives. Top-down and bottom-up approaches for cost estimation are used in this analysis. The analysis was determined by life cycle cost and management costs. The cost analysis showed the payback period of an LNG fueled ship retrofit is 4.5 years against a 0.5%S compliant fueled vessel. The payback period is considered reasonable and it shows retrofitting vessels for LNG fuel as an attractive option in meeting new regulation for ship-owners. If the shipyard standardizes the tank construction including outfitting, the specified cost may even go lower. A further reduction is also anticipated with repeating orders of similar vessels.

A study on the lightweight design of lift structure by composite materials

2020 ◽  
Vol 34 (07n09) ◽  
pp. 2040032
Author(s):  
Sung-Youl Bae ◽  
Sung-Min Yoon ◽  
Yun-Hae Kim
Keyword(s):  
Structural Design ◽  
Structural Integrity ◽  
Lightweight Design ◽  
Bending Stiffness ◽  
Fiber Direction ◽  
Reinforced Plastics ◽  
Steel Material ◽  
Fiber Reinforced Plastics ◽  
Strength And Stiffness ◽  
Save Energy

The purpose of this study is to reduce the weight of elevator components in order to save energy and apply the findings to the new drive-type elevator system. Structural design has been carried out for two lightweight elevator models in which the damped aluminum laminate (DAL) and carbon fiber reinforced plastics (CFRP) are utilized for the elevator walls, respectively. The structural designs of the new elevator walls are based on the bending stiffness of the existing steel walls. The aluminum elevator model is designed to exhibit a bending stiffness similar to that of the existing steel elevator, while the CFRP model is designed to possess 20% of the existing wall bending stiffness considering that the tensile strength in the fiber direction is about nine times higher than that of the existing structural steel material. DAL and CFRP are applied to the elevator walls, respectively, and aluminum sandwich structures are applied to the ceiling and platform of two kinds of lightweight elevator models. It has been ascertained that the aluminum elevator model is about 40% lighter than the existing steel elevator, and the CFRP elevator model is about 50% lighter than the existing elevator. In order to evaluate the structural integrity of the newly designed elevator model, the criteria presented in the elevator inspection guideline are applied. The designed elevator model is confirmed to satisfy the strength and stiffness criteria presented in the elevator inspection parameter.

Sign in / Sign up

Export Citation Format

Share Document