Efficient Consideration of Contact in Compliant Assembly Variation Analysis

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Georg Ungemach ◽  
Frank Mantwill
Keyword(s):  
Dimensional Accuracy ◽  
Tolerance Analysis ◽  
Nonlinear Effects ◽  
Variation Analysis ◽  
Compliant Assembly ◽  
Wide Range ◽  
Geometric Deviations ◽  
Statistical Tolerance ◽  
The Individual

The geometric deviations of real parts pose a major challenge, particularly in the extensively automated mass production of complex assemblies. To meet this challenge, an attempt is made, with the aid of statistical tolerance analysis, to predict dimensional accuracy for various assembly concepts as precisely as possible depending on the individual part tolerances. Most recent developments enable consideration to be given to the deformability of the parts during joining in order to improve the prognostic quality of simulation. The methods that are employed reveal deficits if nonlinear effects such as contact, extensive deformations, or material inelasticities occur. In this work, contact between or with adjacent parts during joining will be investigated, and an efficient and reliable method, which can be unproblematically integrated into existing compliant assembly variation analysis programs, will be developed. To achieve this, the methods of springback calculation according to Liu et al. (1995, “Variation Simulation for Deformable Sheet Metal Assemblies Using Mechanistic Models,” Trans. NAMRI/SME, 23, pp. 235–241) have been extended and coupled with numerical contact mechanics methods in order to realistically portray the problem, which usually involves intensive computing, with a minimum of additional effort. The method that has been developed will be validated on the basis of two examples with the aid of nonlinear finite element analyses, the results of which can be regarded as state-of-the-art in mechanical problems involving contact. The quality of the results reveals that this method improves the quality of prognosis for a wide range of applications and, consequently, that production problems can be combated during an early development phase.

Variation Analysis of Compliant Parts in Composite Material Joined by Adhesive: A Numerical Tool

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Andrea Corrado ◽  
Wilma Polini
Keyword(s):  
Composite Material ◽  
Functional Relationship ◽  
Tolerance Analysis ◽  
Variation Analysis ◽  
Geometric Deviations ◽  
Numerical Tool ◽  
Compliant Parts ◽  
The Individual ◽  
Good Agreement

Tolerance analysis defines a procedure to estimate the resultant variation of the assembly geometry, given the tolerances associated with individual components and the functional relationship between the individual components and the assembly requirements. This aspect is particularly relevant when parts made of composite material are considered, since the research emphasis to date was on the design and fabrication of composite parts, with considerably less attention to quality issues in their subsequent assembly. This work presents a numerical tool to solve the tolerance analysis of assemblies made of compliant parts in composite material; it estimates the geometric deviations of an assembly due to the compliance of the material, the geometrical deviations of the components and the fastening of the parts by adhesive. The comparison between numerical and experimental results obtained for a case study shows a good agreement.

THE VALUE OF LOVE IN THE SYSTEM OF FORMATION OF THE PROFESSIONAL MATURITY OF THE EDUCATOR

2020 ◽  
Vol 1 (10(79)) ◽  
pp. 12-18
Author(s):  
G. Bubyreva
Keyword(s):  
Russian Federation ◽  
The State ◽  
Educational Process ◽  
Wide Range ◽  
The Family ◽  
The Russian Federation ◽  
The Government ◽  
The Individual ◽  
The Right

The existing legislation determines the education as "an integral and focused process of teaching and upbringing, which represents a socially important value and shall be implemented so as to meet the interests of the individual, the family, the society and the state". However, even in this part, the meaning of the notion ‘socially significant benefit is not specified and allows for a wide range of interpretation [2]. Yet the more inconcrete is the answer to the question – "who and how should determine the interests of the individual, the family and even the state?" The national doctrine of education in the Russian Federation, which determined the goals of teaching and upbringing, the ways to attain them by means of the state policy regulating the field of education, the target achievements of the development of the educational system for the period up to 2025, approved by the Decree of the Government of the Russian Federation of October 4, 2000 #751, was abrogated by the Decree of the Government of the Russian Federation of March 29, 2014 #245 [7]. The new doctrine has not been developed so far. The RAE Academician A.B. Khutorsky believes that the absence of the national doctrine of education presents a threat to national security and a violation of the right of citizens to quality education. Accordingly, the teacher has to solve the problem of achieving the harmony of interests of the individual, the family, the society and the government on their own, which, however, judging by the officially published results, is the task that exceeds the abilities of the participants of the educational process.  The particular concern about the results of the patriotic upbringing served as a basis for the legislative initiative of the RF President V. V. Putin, who introduced the project of an amendment to the Law of RF "About Education of the Russian Federation" to the State Duma in 2020, regarding the quality of patriotic upbringing [3]. Patriotism, considered by the President of RF V. V. Putin as the only possible idea to unite the nation is "THE FEELING OF LOVE OF THE MOTHERLAND" and the readiness for every sacrifice and heroic deed for the sake of the interests of your Motherland. However, the practicing educators experience shortfalls in efficient methodologies of patriotic upbringing, which should let them bring up citizens, loving their Motherland more than themselves. The article is dedicated to solution to this problem based on the Value-sense paradigm of upbringing educational dynasty of the Kurbatovs [15].

scholarly journals Comprehensive Downtime Prediction in Next-Generation Internet

1970 ◽  
Vol 5 (1) ◽  
Author(s):  
W. F. Al-Khateeb, S. Al-Irhayim, and K. A. Al-Khateeb
Keyword(s):  
Analytical Calculation ◽  
Multiprotocol Label Switching ◽  
Next Generation ◽  
Label Switching ◽  
Next Generation Internet ◽  
Reliability Parameters ◽  
Wide Range ◽  
The Individual ◽  
Single Figure

The benchmark for the reliability quality of networks depends mainly on the accuracy and comprehensiveness of the reliability parameters. Downtime prediction of a communication system is crucial for the quality of service (QoS) offered to the end-user. Markov model enables analytical calculation of average single figure cumulative downtime over one year. The single average approach, generally, does not adequately describe the wide range of service performance that is likely to be experienced in communications systems due to the random nature of the failure. Therefore, it would be more appropriate to add downtime distribution obtained from network availability models to predict the expected cumulative downtime and other performance parameters among a large number of system populations. The distribution approach provides more comprehensive information about the behavior of the individual systems. Laplace-Stieltjes transform enables analytical solutions for simple network architectures, i.e. the simplex system and the parallel system. This paper uses simulations to determine reliability parameters for complex architecture such as the Multiprotocol Label Switching (MPLS) backbone planned for next-generation Internet. In addition to the single figure downtime, simulations provide other reliability parameters such as probability of zero downtime. The paper also considers the downtime distribution among a population of equally designed systems.Key Words: Reliability, availability, downtime, Multiprotocol label switching

Statistical Tolerance Analysis of Over-Constrained Mechanical Assemblies With Form Defects Considering Contact Types

2019 ◽  
Vol 19 (2) ◽  
Author(s):  
Edoh Goka ◽  
Lazhar Homri ◽  
Pierre Beaurepaire ◽  
Jean-Yves Dantan
Keyword(s):  
Tolerance Analysis ◽  
Optimization Methods ◽  
Optimization Techniques ◽  
Behavior Modeling ◽  
Functional Requirements ◽  
Mechanical Assembly ◽  
Mechanical Assemblies ◽  
Statistical Tolerance ◽  
The Individual ◽  
Statistical Tolerance Analysis

Tolerance analysis aims toward the verification impact of the individual tolerances on the assembly and functional requirements of a mechanism. The manufactured products have several types of contact and are inherent in imperfections, which often causes the failure of the assembly and its functioning. Tolerances are, therefore, allocated to each part of the mechanism in purpose to obtain an optimal quality of the final product. Three main issues are generally defined to realize the tolerance analysis of a mechanical assembly: the geometrical deviations modeling, the geometrical behavior modeling, and the tolerance analysis techniques. In this paper, a method is proposed to realize the tolerance analysis of an over-constrained mechanical assembly with form defects by considering the contacts nature (fixed, sliding, and floating contacts) in its geometrical behavior modeling. Different optimization methods are used to study the different contact types. The overall statistical tolerance analysis of the over-constrained mechanical assembly is carried out by determining the assembly and the functionality probabilities based on optimization techniques combined with a Monte Carlo simulation (MCS). An application to an over-constrained mechanical assembly is given at the end.

CAD-Based Tolerance Analysis in Preliminary Design Stages Enabling Early Tolerance Evaluation

2018 ◽  
Author(s):  
Stefan Goetz ◽  
Benjamin Schleich ◽  
Sandro Wartzack
Keyword(s):  
Tolerance Analysis ◽  
Design Stage ◽  
Preliminary Design ◽  
Design Changes ◽  
Preliminary Design Stage ◽  
Geometric Deviations ◽  
Set Up ◽  
Quality Of Products ◽  
Analysis Models

Associated with manufacturing and assembly processes, inevitable geometric deviations have a decisive influence on the function and quality of products. Therefore, their consideration and management are important tasks in product development. Moreover, to meet the demand for short development times, the front-loading of design processes is indispensable. This requires early tolerance analyses evaluating the effect of deviations in a design stage, where the product’s geometry has not yet been finally defined. Since such an early tolerance consideration allows quick and economic design changes seeking for robust designs, it is advisable that the design engineer, who is entirely familiar with the design, should take this step. For this purpose, this paper presents an easy-to-use CAD-based tolerance analysis method for skeleton models. The relevant part deviations are represented by varying geometric dimensions with externally driven family tables. The approach comprises the strength of vector-based methods but does not require an expensive set-up of tolerance analysis models. Particularly, the novelty of this method lies in the CAD-internal sampling-based tolerance analysis of simple geometries without the use of expensive CAT software. This enables designers to evaluate the effect of tolerances already at the preliminary design stage. Using a case study, the presented approach is compared with the conventional vector-based tolerance analysis.

scholarly journals SOCIAL COHESION IN UKRAINE (THE EXPERIENCE OF APPLICATION OF BERTELSMANN STIFTUNG METHOD TO EUROPEAN SOCIAL SURVEY DATA)

2017 ◽  
Vol 8 ◽  
pp. 58-65 ◽  
Author(s):  
M. Bondarenko ◽  
S. Babenko ◽  
O. Borovskiy
Keyword(s):  
Quality Of Life ◽  
Survey Data ◽  
Social Relations ◽  
Social Cohesion ◽  
European Social Survey ◽  
Social Survey ◽  
Wide Range ◽  
Social Quality Of Life ◽  
The Individual

The present article highlights the results of social cohesion study fulfilled on datasets collected during the sixth wave of the European Social Survey. The conducted study involved the explanation of the importance of social cohesion as a social phenomenon, caused by a paradigmatic shift of approaches to measuring the quality of life of societies. This involved the consideration of social cohesion as an important factor to measure the "social quality" of life. For this purpose, a technique implemented by Bertelsmann Stiftung was used, which was applied to available sixth wave of European Social Survey data, the latter, which included Ukraine, and further certified through the analysis of other additional sources. The study allowed to make a number of substantive conclusions about the level of social cohesion in Ukraine comparing to European countries and other countries of the world. Some recommendations for further research on social cohesion also have been given. The said phenomenon is important because it once can cover a wide range of socially important issues, being simultaneously at both the individual and the collective (macro) level of consciousness. The research of social cohesion highlights "problematic social spheres", so-called weak points of social relations, and conclusions provide knowledge about the direction, to which the efforts to improve the life of the society should be primarily directed.

scholarly journals Anti-Corruption Expertise in Evaluating the Effectiveness of the Anti-Corruption Policy

2018 ◽  
Vol 12 (5) ◽  
pp. 689-698
Author(s):  
Tatyana Sudakova ◽  
Natalya Vasilyeva
Keyword(s):  
Public Relations ◽  
Expert Evaluation ◽  
Important Place ◽  
Individual Level ◽  
Irkutsk Region ◽  
Wide Range ◽  
Strategic Measures ◽  
The Individual ◽  
Quantitative Indicators

The effectiveness of currently implemented wide range of strategic measures aimed at reducing the corruption and criminogenic potential in many spheres of life directly depends on their effectiveness in some key areas. The institute of anti-corruption expertise (ACE) of legislation, which now incorporates a considerable theoretical and methodological basis, requires further improvement and elimination of identified drawbacks. An almost decade of its history has been characterized by a steadily growing number of expert evaluations and the corresponding increase in the number of identified corruption-generating factors and the number of changes and amendments to normative acts. However, this dynamics is subject to controversial evaluations by analysts who talk about a routine formalistic approach and stereotyped, one-size-fits-all actions of experts and other parties involved in the multilateral mechanism of ACE. The analysis of information on the websites of professional bodies implementing ACE from the standpoint of quantitative indicators shows that this institute is effective. At the same time, the true criteria of effectiveness, connected with the improvements in the quality of the lawmaking process as a desirable result of implementing ACE, cannot be reduced to the evaluation of quantitative indicators alone. The monitoring of the effectiveness of measures implemented today within the ACE framework duly stresses the qualitative criteria of such effectiveness. Using them in the expert evaluation of municipal normative legal acts (NLA) and draft acts makes it possible to update the task of improving the quality of the lawmaking process at all levels of public administration. Municipal NLAs hold an important place both in the volume of the decisions made and the scope of public relations that they regulate, which sets the task of evaluating the quality of such acts to a new level. The analysis of the regional expert evaluation of municipal NLAs (using the example of Irkutsk Region) made it possible to compare the existing practices in this sphere and to identify typical circumstances that reduce the anti-criminogenic potential of ACE. The expertise aimed at identifying the corruption-generating factors in the law enforcement acts - in the personified decisions of the municipal bodies - is not common practice. At the same time, such NLAs at the individual level act as serious regulators of the legal sphere of peoples lives because they are connected with decisions on the provision of state support, the allocation of quotas, the distribution of expenses, etc.

Harnessing the Complexity of Innovation

2013 ◽  
Vol 4 (3) ◽  
pp. 1-13 ◽  
Author(s):  
Ton Jörg ◽  
Stephanie Akkaoui Hughes
Keyword(s):  
Complex Dynamics ◽  
Nonlinear Effects ◽  
Human Interaction ◽  
Complex Nature ◽  
Generative Process ◽  
Complex Process ◽  
Conditions Of Possibility ◽  
The Individual ◽  
New Framework

The concept of innovation is hard to define and, consequently, difficult to put into practice. It is argued that the actual complexity of innovation is too much taken for granted. In this article the focus is on analyzing the very complexity of innovation, its dynamics and potential for practice. Innovation is taken as linked to creativity, by the processes of learning, thinking and knowing. Henceforth the complex dynamics of innovation is a time-related process. The ensemble of two partners and their interaction is the basic dynamic unit for innovation. Modeling this unit within the new framework of complexity shows innovation to be a (self-) generative kind of process, depending on the context with its conditions. These may be called “the conditions of possibility for innovation”. These conditions, which are closely linked to facilitating the quality of interaction and relationships between the partners in interaction, within a community of interaction, may be shown to unravel innovation as a nonlinear generative process with potential nonlinear effects over time. Innovation is shown to be a complex process at both the individual and the collective level. The complexity perspective taken here shows the new way of thinking in complexity about the complex nature of innovation. Organizing complexity is the key for generating potential nonlinear effects of learning, thinking and knowing as emergent effects, thriving on human interaction. So, innovation is thriving on complexity, which, in turn, is thriving on interaction within generative relationships in communities of interaction. To describe how complexity may be ‘at work’ in organizations, and to organize it in a more successful way, a different framing of complexity and a corresponding new language of complexity is urgently needed, to turn complexity into effective complexity within complex organizations.

Identifying Variable Effects on the Dimensional Quality of Compliant Assembly, Using Computer Experiments

2002 ◽  
Author(s):  
Stefan Dahlstro¨m ◽  
S. Jack Hu ◽  
Rikard So¨derberg
Keyword(s):  
Sheet Metal ◽  
Computer Experiments ◽  
Tolerance Analysis ◽  
Response Model ◽  
Element Analysis ◽  
Design Of Computer Experiments ◽  
Compliant Assembly ◽  
Aesthetic Form ◽  
Input Variables

Compliant sheet metal assemblies are often used as support structures in automobiles, airplanes and appliances. These structures not only provide a metrology frame for other modules to be assembled, but also give the product its aesthetic form. For this reason, the dimension quality of the assemblies is a very important factor to control, in order to make sure that the product will function as planned and continuously keep the product cost low. The assembly is influenced by variations in the component parts and the assembly processes. Tolerance analysis, as conducted in most industries today, is normally based on the assumption of rigid parts and is thus not always valid for sheet metal assemblies, due to their compliance. This paper will present a method, based on finite element analysis (FEA) and design of computer experiments, of identifying the influence of input variables on the final geometry variation of the assembly. The influence and the interactions among the input variables are analyzed with a response model that has been constructed, using the simulation results. This response model could be used to identify the important variables that need to be controlled in assembly. An example application is included, in order to demonstrate the simulation model and response model construction. Analysis of the results from the simulations can facilitate the design of the assembly process, in order to control the dimensional quality of the product.

scholarly journals Outpatient multidisciplinary cancer rehabilitation in Switzerland: a status assessment

2021 ◽  
Author(s):  
Anna Dehler ◽  
Sophie Cabaset ◽  
Margareta Schmid ◽  
Beate Schneider-Mörsch ◽  
Nicolas Sperisen ◽  
...  
Keyword(s):  
Descriptive Analysis ◽  
Cancer Rehabilitation ◽  
Low Intensity ◽  
Wide Range ◽  
The Status ◽  
French Speaking ◽  
German Speaking ◽  
Status Assessment ◽  
The Individual

Abstract Aim This study aimed to assess the situation of outpatient multidisciplinary cancer rehabilitation in Switzerland as of March 2018. Subject and methods Seventeen programmes providing outpatient cancer rehabilitation were identified; 12 in the German-speaking, 4 in the French-speaking and 1 in the Italian-speaking part of Switzerland. Structure, organisation, type of programme and details on therapies offered were assessed. Difference by language regions and the status of the programme (running vs in development) were examined in a descriptive analysis. Results Centres in the German- and Italian-speaking parts had mostly individual modular programmes with a longer duration (median: 12 weeks) and low intensity (median: 2.5–3 h per week). The French-speaking part had standard programmes with a shorter duration (median: 9 weeks) but higher intensity (median: 5.5 h per week) and a higher number of obligatory modules a patient must attend (median: 2 instead of 1). The language regions also showed differences in duration of therapies, communication, indications and screening instruments. Conclusion Outpatient cancer rehabilitation in Switzerland is characterized by a wide range of programmes. These differences between language regions, as well as between the individual programmes, highlight important variables that may influence the efficiency and the quality of the different programmes; understanding these variables could lead to improvements in cancer rehabilitation in Switzerland.

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