Study of the Influence of Measurement Uncertainty on the Sorting of Machined Parts

2015 ◽  
Vol 809-810 ◽  
pp. 1275-1280
Author(s):  
Pavlina Toteva ◽  
Dimka Vasileva

The basis of effective and efficient production are the measurements. Manufacturing processes should meet the accuracy requirements to produce fit products. Processes capabilities are determined (estimated) and managed by measurements and not at least the suitability of the products are also found by measurements. The measurement technique is considered as a factor associated with costs without taking part in the creation of added value. As a logical consequence is offered to reduce the measurements in order to reduce costs, according to the possibilities, but this leads to increasing of defects in production. This expensive and sometimes fatal consequences of this mentality are not reported. Processes and products are evaluated incorrectly. The number of errors and the expenses increase.

10.6036/9938 ◽  
2021 ◽  
Vol 96 (3) ◽  
pp. 233-234
Author(s):  
LEANDRO RUIZ ◽  
MANUEL TORRES ◽  
ALEJANDRO GOMEZ VILANOVA ◽  
SEBASTIAN DIAZ DIAZ ◽  
FRANCISCO CAVAS MARTINEZ

Adoption by the aeronautical sector of developments and technologies of the so-called Industry 4.0 is a major transformation, due to the added value that these new processes bring to the production chain. It is in this context, in which the relevance of the digitalization and automation of all manufacturing processes is observed, with the increasingly widespread implantation of robotic cells and other technologies such as systems of vision and artificial intelligence, will lead to a new digital scenario that will allow the creation in real time of reconfigurable and sustainable spaces with high productivity and reliability.


2019 ◽  
Vol 5 (2) ◽  
pp. 100-109
Author(s):  
Maria Sarmento ◽  
Marlene Amorim ◽  
Marta Ferreira Dias ◽  
Mara Madaleno

Background: Innovation can result from progressive or significant changes to existing products leading to improvements in performance and user value. This is the type of innovation that is more easily perceived by the consumer, as it results in the creation of new products or the improvement of existing ones. Innovation in the Crafts Sector is a relevant topic to address market changes, and meet evolving consumer preferences. In this vein, artisans need to meet the calls for regularly investing in the design of new products and processes, with the purpose of achieving the sustainability of their business. Methods: This article addresses the existing calls for contextualizing the crafts sector and for fostering product innovation in this area, by investigating the barriers and problems faced by artisans, as well as by exploring existing experiences in overcoming them. The article builds on data collected in five European countries, under the scope of the Erasmus+ Project Craftsmanship+ “Fostering a New and Competitive Approach to Crafts and Semi Industrial high added-value sectors”1. Results and Conclusion: The aim is to analyze the importance of the crafts sector in a European context. This article contributes in a timely manner to the understanding of the crafts sector by paying attention to the obstacles that artisans face in order to ensure the sustainability of their business by introducing product innovation into their organization and/or market. This study offers a collection of innovation experiences in realities that are very significant for territorial identity, and thus aims to provide an incentive for further research.


2015 ◽  
Vol 8 (4) ◽  
pp. 1673-1684 ◽  
Author(s):  
G. E. Bodeker ◽  
S. Kremser

Abstract. The Global Climate Observing System (GCOS) Reference Upper Air Network (GRUAN) provides reference quality RS92 radiosonde measurements of temperature, pressure and humidity. A key attribute of reference quality measurements, and hence GRUAN data, is that each datum has a well characterized and traceable estimate of the measurement uncertainty. The long-term homogeneity of the measurement records, and their well characterized uncertainties, make these data suitable for reliably detecting changes in global and regional climate on decadal time scales. Considerable effort is invested in GRUAN operations to (i) describe and analyse all sources of measurement uncertainty to the extent possible, (ii) quantify and synthesize the contribution of each source of uncertainty to the total measurement uncertainty, and (iii) verify that the evaluated net uncertainty is within the required target uncertainty. However, if the climate science community is not sufficiently well informed on how to capitalize on this added value, the significant investment in estimating meaningful measurement uncertainties is largely wasted. This paper presents and discusses the techniques that will need to be employed to reliably quantify long-term trends in GRUAN data records. A pedagogical approach is taken whereby numerical recipes for key parts of the trend analysis process are explored. The paper discusses the construction of linear least squares regression models for trend analysis, boot-strapping approaches to determine uncertainties in trends, dealing with the combined effects of autocorrelation in the data and measurement uncertainties in calculating the uncertainty on trends, best practice for determining seasonality in trends, how to deal with co-linear basis functions, and interpreting derived trends. Synthetic data sets are used to demonstrate these concepts which are then applied to a first analysis of temperature trends in RS92 radiosonde upper air soundings at the GRUAN site at Lindenberg, Germany (52.21° N, 14.12° E).


2015 ◽  
Vol 21 (2) ◽  
pp. 294-299 ◽  
Author(s):  
Sevdalina Dimitrova ◽  
Venelin Terziev

Abstract The strategic decisions defining the defence capabilities that are necessary for our country in response to the dynamic changes in the security environment are directly related to the question “How much?” concerning the price that taxpayers should pay for the creation and development of those capabilities. Since security and defense constitute a public good whose creation is entirely dependent on the economic potential, on the GDP of the country, the manifestation of the price of that good is the budget of the Defence Ministry. This calls for the implementation of a system and tools, appropriate for budget resource management in order to ensure the increase of the added value of defence capabilities.


2018 ◽  
Vol 5 (1) ◽  
pp. 10-16
Author(s):  
Asro Laelani Indrayanti ◽  
Elyta Vivi Yanti ◽  
Arief Rahman Hakim

Technological innovation in local food products is absolutely necessary, by creating the added value in such a way as local products so that the products produced have more or at least the same value as local products. The result of the creation of local products, Copasme able to meet the growing demands of global consumers, namely in addition to demanding aspects of pleasure, the enjoyment of local products, consumers still want aspects of health and safety. Copasme is one of the alternative drink sachets developed in Palangkaraya City. From the analysis of copasme sachet business during one period (per month) it is known that (1) production cost is IDR. 6,472,000.00 (2) revenue of IDR. 21,600,000.00, (3) Net income / profit of IDR. 15,128,000.00 (4) Efficiency of 3.3. This shows that the sachet copas business is efficient or feasible.


2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Θάνος Μαρούκης

<p>This paper intends to show, that the current<br />marginalization of domestic labour runs in the<br />detriment of both the workers and the needs<br />of the labour market. It is strongly contested<br />whether domestic labour in its current form<br />can meet the demands of a fl exible and<br />economic and social environment. At the<br />core of discussions on new, fl exible forms<br />of organization of labour one usually fi nds<br />economic sectors involving high skills and<br />added value. However, the diffusion of fl exible<br />employment schemes is related not only with<br />more high skill jobs in the labour market<br />but also with the creation of infrastructures<br />and niches able to support them. In this<br />context, a pathway towards the viability of<br />the marginalized niche of domestic labour<br />is discussed. Key position in this venture<br />is that the devaluation of domestic labour<br />is the product of a social – and therefore<br />manageable and reversible – process.</p>


Author(s):  
Jorge G. Cham ◽  
Beth L. Pruitt ◽  
Mark R. Cutkosky ◽  
Mike Binnard ◽  
Lee E. Weiss ◽  
...  

Abstract This paper addresses the design and manufacturing of products with embedded components through layered manufacturing processes such as Shape Deposition Manufacturing (SDM). Embedding components allows the creation of novel designs such as “smart” products and integrated assemblies of sensors, actuators and other mechanical components. We present prototypes to illustrate the possibilities for such devices and we address the issues that constrain their process planning. Next, we present a combination of process planning algorithms and manufacturing methods that we have developed to support the design of layered products with embedded components.


Author(s):  
Raeni Dwisanty ◽  
Juanim Juanim ◽  
Choi Wongyu ◽  
Alfath Prannisa ◽  
Horas Djulius

2015 ◽  
Vol 43 (10/11) ◽  
pp. 1051-1064 ◽  
Author(s):  
Sara Keith ◽  
Maria Silies

Purpose – The term luxury and sustainability, within the fashion and textile industries are seldom seen as natural bedfellows. Recently however, the perception of luxury has begun to include a definition left behind in the twentieth century; beautifully hand crafted artefacts valued for the time, skill and design invested in them. It is possible though, for the concept of luxury textiles to embrace this definition and that of the sustainable credentials of a “Cradle to Cradle” (McDonough and Braungart, 2002) mindset (that of a life beyond original creation) and be fashionable. The paper aims to discuss these issues. Design/methodology/approach – Utilising a variety of methodologies including case studies, reflective practice and a practice-based approach; this paper examines the use of pre-consumer waste in the creation of new luxury textiles. Several projects are cited, offering examples of collaboration between textile mills and designers in the creation of new fabrics made from luxury by-products. This luxury waste is routinely shredded for automobile seat filling or landfill, however current sustainable thinking encourages a more creative solution to this circumstance. Designers have a crucial role to play in converting an unwanted by-product to one that is highly desirable. Findings – Traditional values of what constitutes a luxury item include the concept of time invested in making a unique handmade artefact. More recently, this premise has been overlooked in favour of branded goods. The slow fashion movement advocates the inherent value of craftsmanship coupled with the ethical use of sustainable and or local materials and processes. The traditional techniques of felting, weave and stitch are utilised to create beautiful, original textiles from discarded waste. By collaborating with local mills, designers provide solutions to something that could be perceived as a problem. Originality/value – The embedded narrative within these layered textiles provides an original quality and added value, building on their Scottish heritage. The resulting textiles reflect their provenance; the landscape they come from and the people who created them. As a result of purchase, the story continues with the new custodian, adding to the ongoing history of the textile. The design work and collaboration that this paper outlines embodies a transferable model for sustainable upcycled luxury textiles.


2014 ◽  
Vol 49 (3) ◽  
pp. 474-489 ◽  
Author(s):  
Luis E. Rincón ◽  
Valentina Hernández ◽  
Carlos A. Cardona

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