Utilizing Design for Assembly Principles to Predict Product Recyclability

2017 ◽  
Author(s):  
Darshan P. Yadav ◽  
Deep N. Patel ◽  
Beshoy W. Morkos
Keyword(s):  
Comparative Analysis ◽  
Design Space ◽  
Significant Negative Correlation ◽  
Design For Assembly ◽  
Assembly Rules ◽  
Time Estimate ◽  
Predictive Capability ◽  
Design Decisions ◽  
Assembly Principles

Designing products for recyclability is driven by environmental and economic goals. Several Design for Assembly rules and parameters can be used to gauge the recyclability index of product designs. These indices can then be used for comparative analysis of the recyclability of different products. This would assist the designer in making design choices related to the end of the product’s life cycle. Further, such design decisions could be made earlier in the design process, when the design space is less bound. A case study was conducted for different products to compare their recyclability indices. The parameters were obtained from existing Design for Assembly time estimate tables. The results of the study indicated the recyclability of the product, as defined by established recyclability metrics, could be predicted through design for assembly measures. A statistically significant negative correlation was realized between recyclability and insertion time. Effectively, components that required greater time to mate during assembly adversely affected the recyclability of the product. Conversely, handing time was found to have no predictive capability to product recyclability.

Development of Product Recyclability Index Utilizing Design for Assembly and Disassembly Principles

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Darshan P. Yadav ◽  
Deep N. Patel ◽  
Beshoy W. Morkos
Keyword(s):  
Comparative Analysis ◽  
Design Process ◽  
Negative Correlation ◽  
Design Space ◽  
Design For Assembly ◽  
Time Estimate ◽  
Predictive Capability ◽  
Design Decisions ◽  
Design And Manufacturing

Designing products for recyclability is driven by environmental and economic goals. Several design for assembly (DFA) rules and parameters can be used to gauge the recyclability index of product designs. These indices can be used for comparative analysis of the recyclability of different products. This assists the designer in making design choices related to the product's end of life. However, many of the existing recyclability indices are only available after design and manufacturing decisions are made. If such design decisions could be made earlier in the design process, when the design space is less bound, recyclability could be considered earlier. A case study is performed to determine if DFA parameters could be utilized to determine product recyclability. The parameters were obtained from existing DFA time estimate tables. The results of the study indicated that the recyclability of the product, as defined by established recyclability metrics, could be predicted through DFA measures. A negative correlation was realized between recyclability and insertion time. Components that required greater time to mate during assembly adversely affected the recyclability of the product. Conversely, handing time was found to have no predictive capability on product recyclability. These findings are used to develop a recyclability index that utilizes the DFA measures, allowing designers and engineers to determine recyclability earlier in the design process.

scholarly journals Product Design Evaluation Using Life Cycle Assessment and Design for Assembly: A Case Study of a Water Leakage Alarm

2018 ◽  
Vol 10 (8) ◽  
pp. 2821 ◽  
Author(s):  
Tatbita Suhariyanto ◽  
Dzuraidah Wahab ◽  
Mohd Rahman
Keyword(s):  
Life Cycle ◽  
Environmental Impact ◽  
Design Evaluation ◽  
Design For Assembly ◽  
Water Leakage ◽  
Design Efficiency ◽  
Use Stage ◽  
Assembly Principles ◽  
Manufacturing Stage

This study proposed the use of an LCA supported by a design efficiency evaluation based on Design for Assembly principles to reduce the environmental impact of a product. To illustrate the methodology, a water leakage alarm (WLA) was selected as the object for a case study. Based on the identification and evaluation of the LCA results, it was inferred that the stage with the highest environmental impact was the manufacturing stage (75.35%), followed by the use stage (23.88%), the disposal of the WLA (0.64%), and finally, the disposal of the batteries (0.14%). For the manufacturing stage, the most interrelated categories were the hazardous waste and human toxicity, while the use stage was the main contributor to ozone depletion and acidification. Moreover, the disposal of the WLA and batteries contributed to the bulk waste. Furthermore, from the assembly evaluation, the design efficiency of the product was 14%. Two recommendations for improving the design of the WLA were: (1) to reduce the number of screws from three units to one unit, and (2) to eliminate the use of a cable and to replace it with a wireless component. By implementing both the proposed recommendations, the design efficiency was improved by as much as 34%. From the environmental perspective, there is not much difference between the wired alarm and wireless alarm. The wired alarm was considered to be more environmentally friendly in terms of product manufacturing but the wireless alarm has an advantage in terms of design and energy efficiency. By combining LCA and DFA design evaluation, a more comprehensive perspective of the product life cycle can be achieved.

Optimization of Constraint Location, Orientation, and Quantity in Mechanical Assembly

2013 ◽  
Vol 135 (7) ◽  
Author(s):  
Leonard Rusli ◽  
Anthony Luscher ◽  
James Schmiedeler
Keyword(s):  
Design Space ◽  
Design Tool ◽  
Analysis Tool ◽  
Mechanical Assembly ◽  
Design Decisions ◽  
Performance Variables ◽  
Threaded Fasteners ◽  
Assembly Performance ◽  
Individual Design

A mechanical assembly aims to remove 6 degree-of-freedom (DOF) motion between two or more parts using features such as fasteners, integral attachments, and mating surfaces, all of which act as constraints. The locations, orientations, and quantity of these constraints directly influence the effectiveness of a constraint configuration to eliminate DOF; therefore, constraint design decisions are crucial to the performance of a mechanical assembly. The design tool presented in this paper uses an analysis tool developed by the authors to explore a user-specified constraint design space and help the designer make informed decisions based on quantitative data so as to optimize constraint locations and orientations. The utility of the design tool is demonstrated with an assembly case study that contains both threaded fasteners and integral attachments. The results identify the opportunity for significant improvements by separately exploring individual design spaces associated with some constraints and further gains through a search of a multidimensional design space that leverages interaction effects between the location and orientation variables. The example also highlights how the tool can help identify nonintuitive solutions such as nonrectilinear, nonplanar parting lines. A trade-off study demonstrates how the design tool can quantitatively aid in optimizing the total number of constraints. Adding constraints generally improves an assembly's performance at the expense of increased redundancy, which can cause locked-in stresses and assembly inaccuracies, so the design tools helps identify new/removable constraints that offer the greatest/least contribution to the overall part constraint configuration. Through these capabilities, this design tool provides useful data to optimize and understand mechanical assembly performance variables.

Improving the integrated reporting of electric-power industry companies

2020 ◽  
Vol 23 (8) ◽  
pp. 922-939
Author(s):  
N.V. Malinovskaya ◽  
M.D. Malinovskii
Keyword(s):  
Comparative Analysis ◽  
Electric Power ◽  
Electric Power Industry ◽  
Power Industry ◽  
Integrated Reporting ◽  
Strategic Objectives ◽  
Methods Of Analysis ◽  
Analysis And Synthesis ◽  
Guiding Principles

Subject. This article deals with the issues relating to improving integrated reporting in terms of dovetailing strategic objectives with capital changes. Objectives. The article aims to develop a system of indicators for disclosure of capital types in integrated reporting of electricity generating companies, as well as recommendations aimed at implementing the fundamental concepts and guiding principles of integrated reporting. Methods. For the study, we used the methods of analysis and synthesis, comparison, generalization, and abstraction. As a case study, we conduct a comparative analysis of the disclosure of six types of capital by the largest electricity generating companies, namely PAO Inter RAO, AO Rosenergoatom and PAO RusHydro. Results. The article formulates proposals for disclosure of capital information to address such a lack of accountability as a contradiction to the principle of coherence. It proposes a system of indicators (core and additional) for disclosure of six types of capital by electricity generating companies. Conclusions. A significant reporting problem is the lack of correlation between key strategic objectives and capital changes. The formulated recommendations for disclosure of capital information can help solve this problem, and increase the attractiveness of the integrated report for capital providers.

Non-standard functions and structures of ministries of finance under economic challenges: A case study of Western governments

2020 ◽  
Vol 26 (11) ◽  
pp. 2448-2471
Author(s):  
S.V. Anureev
Keyword(s):  
Economic Growth ◽  
Economic Development ◽  
Comparative Analysis ◽  
Great Britain ◽  
Central Banks ◽  
Economic Recovery ◽  
Budget Process

Subject. This article examines the functions and management structures of central financial bodies and related parliamentary and governmental structures in Australia, Canada, Great Britain, Japan, Germany, France and Italy. Objectives. The article aims to identify non-standard functions and structures that go beyond the classical responsibility of finance ministries as a central part of the budget process arising from current economic challenges. Methods. For the study, I used a comparative analysis. Results. The article describes the important new functions of financial authorities and treasuries of Western governments aimed at economic growth and economic recovery. Conclusions. The organizational and management structures and functions of the ministries of finance go far beyond the budget process, overlap with and dominate the functions of central banks and ministries of economic development.

INVESTIGATING ENGLISH DEPARTMENT STUDENTS’ FOREIGN LANGUAGE SPEAKING ANXIETY: A CASE STUDY IN UNIVERSITAS AIRLANGGA, INDONESIA

2020 ◽  
Vol 1 (2) ◽  
pp. 22
Author(s):  
Dyas Intan Rachmawati ◽  
Jurianto Jurianto
Keyword(s):  
Foreign Language ◽  
Significant Negative Correlation ◽  
English Department ◽  
Common Phenomenon ◽  
Speaking Anxiety ◽  
Pearson Product Moment Correlation ◽  
Efl Learners ◽  
Achievement Score ◽  
Anxiety Levels

Anxiety during a speaking performance is a common phenomenon experienced by any EFL learners, including students majoring in English. Focusing on the issue, this study investigates the correlation between students’ foreign language speaking anxiety and speaking achievement. Moreover, this study also observes the levels and the sources of the speaking anxiety among the English Department’s fifth-semester students of Universitas Airlangga. This study used the Foreign Language Speaking Anxiety Scale (FLSAS) by Öztürk and Gurbuz (2014). The FLSAS questionnaire was distributed to 114 students in order to explore the correlation between speaking anxiety and speaking achievement, the speaking anxiety levels, and the speaking anxiety sources. The data collected through questionnaire were analyzed with SPSS 25.0. Pearson Product Moment Correlation isused to determine the correlation, while descriptive statistic alanalys is isused to investigate the levels and the sources for speaking anxiety. Horwitz, Horwitzand Cope’s(1986) theory and Horwitz and Young (1991) about the source and the levels of foreign language speaking anxiety are also used in this study. This study found that there is a significant negative correlation between speaking anxiety levels and speaking achievement. This means the higher the speaking anxiety they experience, the lower the achievement score they get. Most of the students have moderate levels of speaking anxiety, which is mainly due to the fear of negative evaluation.This study indicates that although the EFL learners are often exposed to English, they still experience speaking anxiety. These findings suggest that the lecturers should be more aware of students’ anxiety and use strategies that might encourage the students to speak more confidently.

Towards Training Librarian 2.0 through A Community-based Participatory Group Project: A Case Study

2013 ◽  
Author(s):  
Lu Xiao ◽  
Trina Joyce Sajo
Keyword(s):  
Participatory Approach ◽  
Group Project ◽  
Community Based ◽  
Design Decisions ◽  
Etude De Cas ◽  
Étude De Cas ◽  
User Centered

Librarian 2.0 adopts user-centered approach. This paper reports the case study of a community-based participatory approach for training librarian 2.0. The findings suggest that this approach allows the students to practice user-centered interactions, identify and integrate the user’s needs into design decisions, and develop ways of collecting the user’s feedbacks.Les bibliothécaires 2.0 adoptent une approche centrée sur l’utilisateur. Cet article présente une étude de cas sur une approche participative et communautaire visant à former les bibliothécaires 2.0. Les résultats suggèrent que cette approche permet aux étudiants d’interagir avec les usagers, d’identifier les besoins, de les intégrer dans leur processus décisionnel et de développer des moyens de recueillir les commentaires des usagers. 

Sign in / Sign up

Export Citation Format

Share Document