SummaryThis article compares life cycle assessment studies performed on imaging equipment for the consumer market in order to identify common practices, limitations, areas for improvement, and opportunities for standardization. The analysis suggests that comparisons across studies are significantly hampered by variability in scope, transparency, data sources, and assumptions; it identifies sources of discrepancy and variability. Of particular concern to printing devices was the definition of a functional unit, which can vary significantly depending on the capabilities and use patterns of a printer. Standardization of the functional unit and related assumptions has a high potential to increase quantitative comparability across studies. At the same time, standardizing the functional unit by paper usage excludes the possibility of comparison to alternative communication media.
Purpose – This paper aims to report an experimental study of how surface defects evolve in EP3D printing as more layers are accumulated and proposes a simulation model for the process. Design/methodology/approach – A series of measurements on the surface roughness were taken layer-by-layer for two 30-layer samples. A model of the process was constructed based on dynamic system modeling, system identification techniques and the analysis of the measurements from the samples. Findings – The transient response of the fuser has a significant impact on the surface of the print. The surface of the EP3D printed part depends heavily on the compliance of the interface. The model developed is able to approximate the behavior of the surface as more layers are deposited. Research limitations/implications – The model requires tuning multiple parameters, especially the compliance threshold for the interface; similar experiments/measurements are needed for any change in the system. Practical implications – The simulation model provides a way to evaluate different process parameters and conditions that otherwise would be difficult and expensive to test. Originality/value – This work provides better understanding into the limitations of EP3D printing process and provides a tool to find countermeasures to achieve successful EP3D prints.
Given that a significant percentage of a product’s impacts are defined during design and development, there is a need to effectively integrate Life Cycle Assessment (LCA) into these early phases. However, the lack of standardized practices, the lack of appropriate modeling approaches, data issues, special training requirements for designers, and uncertainties in the results make it difficult to apply LCA in these early stages. In order to address this gap, this work builds on previous research that integrated system engineering and functional analysis into LCA to develop an object-oriented framework for LCA. The framework is applied to a consumer product and the results of the approach demonstrate the potential for an easy to update and scalable LCA model that facilitates comparability. Each module in this model can be developed separately and integrated effectively into a larger model guided by functional analysis techniques. This framework holds the promise to better integrate LCA into the design and development phases.
Cooperation among team members and good teamwork are essential to successfully complete design projects. As such, engineering students are expected to learn how to design and work effectively in a team. While, team-based project courses have been implemented in almost all engineering and engineering technology disciplines, achieving full contribution by all team members has been a persistent challenge in design and other engineering disciplines. This paper proposes a possible approach to establish guidelines to form design teams. In this paper, we first review team-effectiveness models. We then propose a design-team-effectiveness model, which will study associations between inputs, processes, and outputs in order to improve team processes and maximizes team performance through design team composition, work structure and improved team processes. Finally, we propose (1) measurements of design-team inputs, processes, and outputs, and (2) approaches to analyze associations among inputs, processes, and outputs.
With the increased concern over the impact that product and processes have on the environment several tools for environmental impact assessment have been developed. Life Cycle Assessment (LCA) is perhaps the most broadly known and used. The use of LCA is common in industry and there is a growing interest to improve the approach since several unresolved problems have been identified with its use. One important issue to resolve is the proper definition of the functional unit. The stated primary goal of the functional unit in LCA is to ensure comparability of LCA results; however, when reviewing the literature, LCA practitioners remark that comparing LCA studies is a very difficult task. The attributed reasons for this problem are the lack of standardized assumptions and practices, including the definition of the functional unit. Even though several unresolved problems present in LCA have had solutions proposed, a clear and actionable solution to the specific problem of functional unit definition is still not available. This paper will introduce system engineering and functional analysis concepts to the goal and scope definition phase of LCA in order to provide a framework for system definition, system boundary definition, and reference flows identification. System engineering principles and functional analysis have been extensively used to aid the design process, yet these approaches have not been effectively applied to the LCA domain. The benefits associated with the proposed framework include improved comparability of LCAs, dynamic updating of LCAs, and the integration of LCA into early stage product development.
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