Reduction of Noise at the Design Stage: A Case Study of a Lightly Loaded Assembly

An experimental and analytical study is made of the noise emission from the drawroll assembly of a textile draw-twisting machine. As an alternative to resorting to acoustic absorption techniques or the use of expensive high damping materials, investigations are made into the basic method of noise generation in the assembly. This leads to the incorporation of small design changes and the significantly lower noise emission thereby achieved is compared with the original emission. Aimed at the machine designer, the presentation is made in a straightforward, non-mathematical fashion.

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Reduction of Impact Noise at the Design Stage: A Specific Case Study

Proceedings of the Institution of Mechanical Engineers ◽

10.1177/002034837218600124 ◽

1972 ◽

Vol 186 (1) ◽

pp. 391-399

Author(s):

M. A. Salter ◽

B. Downs ◽

G. R. Wray

Keyword(s):

Experimental Approach ◽

Design Stage ◽

Experimental Investigations ◽

Theoretical Treatment ◽

Impact Noise ◽

Design Changes ◽

Machine Cycle ◽

Mechanism Of Impact ◽

The Impact

A case study is made on the tack driving assembly of a boot and shoe lasting machine, and relates to the impact noise occurring during part of the machine cycle. Much of the noise is radiated due to vibrations at several frequencies of the tack driver lifting lever, which is excited by the direct application of impacts during the tack driving process. An experimental approach in applying noise reduction principles to various components of the assembly has been preferred to a more complex theoretical treatment, since the identification of the mechanism of impact noise generation and its subsequent abatement is directly relevant to most machine designers faced with the possibility of impact noise problems in other types of machinery. Small design changes, based on the knowledge gained from the experimental investigations, have resulted in noise reductions from 10 to 14 dB being achieved.

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Reliability-Informed Economic and Energy Evaluation for Design for Remanufacturing: A Case Study on a Hydraulic Manifold

10.1115/detc2021-67996 ◽

2021 ◽

Author(s):

Venkat P. Nemani ◽

Jinqiang Liu ◽

Navaid Ahmed ◽

Adam Cartwright ◽

Gül E. Kremer ◽

...

Keyword(s):

Life Cycles ◽

Design Stage ◽

Design Strategies ◽

Early Design Stage ◽

Energy Evaluation ◽

Design For Remanufacturing ◽

Design Changes ◽

Development Evaluation ◽

Field Reliability

Abstract Design for Remanufacturing (DfRem) is an attractive approach for sustainable product development. Evaluation of DfRem strategies, from both economic and environmental perspectives, at an early design stage can allow the designers to make informed decisions when choosing the best design option. Studying the long-term implications of a particular design scenario requires quantifying the benefits of remanufacturing for multiple life cycles while considering the reliability of the product. In addition to comparing designs on a one-to-one basis, we find that including reliability provides a different insight into comparing design strategies. We present a reliability-informed cost and energy analysis framework that accounts for product reliability for multiple remanufacturing cycles within a certain warranty policy. The variation of reuse rate over successive remanufacturing cycles is formulated using a branched power-law model which provides probabilistic scenarios of reusing or replacing with new units. To demonstrate the utility of this framework, we use the case study of a hydraulic manifold, which is a component of a transmission used in some agricultural equipment, and use real-world field reliability data to quantify the transmission’s reliability. Three design improvement changes are proposed for the manifold and we quantify the costs and energy consumption associated with each of the design changes for multiple remanufacturing cycles.

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An analytical study of the ritual ceremonies in Iranian performing arts, a case study of Travellers

CINEJ Cinema Journal ◽

10.5195/cinej.2020.260 ◽

2020 ◽

Vol 8 (2) ◽

pp. 217-246

Author(s):

Shiva Khalili Kolahian

Keyword(s):

Performing Arts ◽

Research Method ◽

Analytical Study ◽

Scene Design ◽

Iranian Art ◽

Design Changes ◽

Art And Culture

Rites and myths are important parts of the identity and the culture of every nation. Iranian rites and performing arts, as a part of Iranian art and culture, which has always got attention throughout history, can help us recognize ancient Iranian culture and history. Cinema, among other interactive arts, has sometimes been able to portray ritual arts well. Travellers movie, made by Bahram Beyzai, is one of the most prominent examples of the visualization of ritual arts in Iran, because the movie consists of three parts, like the three theaters, in which the rites are portrayed as the main story of the movie, and the Persian culture and customs have been exhibited. This paper, which its research method is descriptive-analytical, examines the standing of rites and ritual arts in Travellers movie and analyzes its atmosphere regarding to performing rituals. Its scene design changes as the script process, so that the application of elements such as light and color, and their intensity and reduction in different mental conditions, from pleasure to mourning, has been considered wisely, and the atmosphere has a dramatic impact on the audience in different scenes. The lighting and the coloring of the scenes in the movie, indicates a tribute to beliefs and faith in rites and ritual arts.

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Towards the formalization of non-functional requirements in conceptual design

Research in Engineering Design ◽

10.1007/s00163-020-00345-6 ◽

2020 ◽

Vol 31 (4) ◽

pp. 449-469

Author(s):

Prabhu Shankar ◽

Beshoy Morkos ◽

Darshan Yadav ◽

Joshua D. Summers

Keyword(s):

Conceptual Design ◽

Design Parameters ◽

Decision Making Process ◽

Design Decision ◽

Functional Requirements ◽

Requirements Modeling ◽

Design Changes ◽

Working Principle ◽

Made In

Abstract This paper explores the formal roles of non-functional requirements’ (NFR) elicitation, definition, and verification in the early stages of an engineering design project. This is performed using a case study conducted at an automotive original equipment manufacturer (OEM) during the design and development of a rear bumper sub-system. The purpose of this exploration is to determine if NFRs should be formalized within requirements modeling scheme. This can capture conceptual design information to identify their impact on other requirements while conducting design changes. The modeling scheme in this paper consists of a sequence of following domains—requirements, functions, working principle, components, design parameters, test measures, and tests—that are mapped to each other using matrices. It is revealed through this case study that non-functional requirements drive much of the design decision-making process and constrain the manner in which the product functionality is realized. Hence, the inclusion of NFRs as a separate and distinct domain in the design process is critical to recognize their significance during design changes. Based on the observations made in the case study, the NFR domain is included in the requirements modeling scheme.

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Aspects Regarding the Redesign of a Component of the Vertical Lifting Module Used in Sustainable Production Management

10.21203/rs.3.rs-1157121/v1 ◽

2021 ◽

Author(s):

Constantin Torcatoru ◽

Dan Săvescu

Keyword(s):

3D Modeling ◽

Production Management ◽

Product Performance ◽

Design Stage ◽

Product Analysis ◽

Manufacturing Costs ◽

Design Efficiency ◽

Cost Reductions ◽

Made In

Abstract To remain competitive on the market with a developed product, it’s very important to analyze the manufacturing costs and times, from the concept stage of the product. Design for manufacturing and assembly (DFMA) is one of the engineering methods that can be applied to reduce manufacturing costs and times, right from the design stage, without compromising product performance and reliability. The 3D modeling of the tray was made in Solidworks, and for the analysis of it’s manufacture and assembly, the Boothroyd and Dewhurst principle and recommendations from the DFMA software were followed. This paper presents a case study for a subassembly called a tray, used in automatic vertical storage systems. For the redesigned model, substantial improvements were obtained, through cost reductions of 12% and an increase in design efficiency from 4.86 to 12.03. Product analysis using DFMA has proven to be a key point in the development of a product that meets engineers.

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The Impact of Decisions Made in Various Architectural Design Stages on Life Cycle Assessment Results

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.861.593 ◽

2016 ◽

Vol 861 ◽

pp. 593-600 ◽

Cited By ~ 2

Author(s):

Benedek Kiss ◽

Zsuzsa Szalay

Keyword(s):

Life Cycle Assessment ◽

Life Cycle ◽

Design Process ◽

Architectural Design ◽

Environmental Indicators ◽

Design Stage ◽

Single Family ◽

The Impact ◽

Made In

Life Cycle Assessment (LCA) is an advantageous tool for the analysis of the overall environmental effects of a building. Most of the decisions that influence the final result of an LCA are made during the design process of the building. Therefore, LCA in early design stages is crucial, because the changes in this period of design are cheaper and more effective. However, there are many other aspects that influence the design of a building. During the design process a high number of variables have to be defined, and in each design stage a specific number of variables have to be fixed depending on various engineering considerations. In this paper we investigate the effect of decisions made in each design stage on LCA results. Within this paper the available possibilities are compared with the variant that was actually selected in each stage, and it is evaluated how environmental indicators evolve during the whole design process. The approach is demonstrated on a case study of a realized single family house.

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