Evaluation of a Mechanical Assembly Using Manual and Robotic Methods

1998 ◽  
Author(s):  
Sameer Risbud ◽  
Utkarsh Jain ◽  
Amol Vartak ◽  
A. H. Soni ◽  
Nilesh Gandhi
Keyword(s):  
Mechanical Assembly ◽  
Main Thrust ◽  
Assembly Evaluation

Abstract This paper attempts to evaluate the assembly of a conventional paper dispenser using manual as well as robotic method. The main thrust of the paper is using the Boothroyd and Dewhurst DFA charts for the assembly evaluation and analysis and commenting critically on the effectiveness of the charts. Thus the paper presents a case study in the analysis of assemblies using Boothroyd and Dewhurst DFA charts.

scholarly journals Les Conflits Interethniques en République Démocratique du Congo et Dans la Région des Grands Lacs Africains : Le Cas de L’ituri

Federalism-E ◽  
1969 ◽  
Vol 5 (1) ◽  
pp. 64-67
Author(s):  
Jok Oga Ukelo
Keyword(s):  
Natural Resources ◽  
Democratic Republic ◽  
Good Governance ◽  
Democratic Republic Of Congo ◽  
Geographical Area ◽  
Main Thrust ◽  
Black Africa ◽  
République Démocratique Du Congo ◽  
Congo Brazzaville

Black Africa has become the theatre of everlasting war. These are wars in which Africans massacre their brothers and plunder the natural resources of their continent. We can cite the cases of the Bakongo and the Bangala in the Congo Brazzaville or the Tutsis and the Hutu in Rwanda. In this article the questions surrounding the interethnic conflicts in the Democratic Republic of Congo, via a case study of the conflict between the Hema and Lendu in the Ituri region, are explored. The main thrust of the article is that the concept of good governance is linked to a sustainable developmental strategy and that this is the only way to reach peace in this geographical area.[...]

scholarly journals Case Study of Strength Calculation and the Possible Repair Options for Screw Thread Damages

2021 ◽  
Vol 9 (11) ◽  
pp. 2044-2054
Author(s):  
Chandrasekhar Narahari
Keyword(s):  
Shear Strength ◽  
Design Criteria ◽  
Screw Thread ◽  
Mechanical Assembly ◽  
Bearing Strength ◽  
Industry Standard ◽  
Margin Of Safety ◽  
Thread Strength ◽  
Repair Techniques

Abstract: Thread Strength and repair capability are critical to successful screw joints for any mechanical assembly. This paper explores the effect of the thread damage utilizing hand calculations, the margin of safety (MOS) for internal & external threads and compares with the required design criteria limit. Hence, the reduction in thread capability is analyzed in terms of shear and bearing strength of threads. This paper also emphasizes the Industry-standard repair techniques such as Helical inserts, Oversize inserts, and Twinserts with limitations and expected process/techniques. Advanced thread repairs in the market such as solid-body thread inserts (key-style, Time-sert, Big-sert) are also discussed Keywords: Thread damages, Shear strength, bearing strength. STI (Screw thread insert)

scholarly journals Identifying the Influential Factors Enriching the Experiences of Visitors of Touristic Religious Sites: The Case Study of Al-Khandaq Battle Site

2021 ◽  
Vol 8 (2) ◽  
pp. 1-9
Author(s):  
Mohamed Saleh Amer ◽  
Abdullah Saeed Karban ◽  
Mohammad Rafee Majid ◽  
Abdulrahman Abdulaziz Majrashi ◽  
Abba Saleh
Keyword(s):  
Qualitative Analysis ◽  
Spatial Planning ◽  
Influential Factors ◽  
Historic Site ◽  
Main Thrust ◽  
Primary Motivation ◽  
Historical Sites ◽  
A Site ◽  
Islamic Values

Enriching visitors' experiences at religious, historical sites (RHS) is getting more attention than before. This research aims to identify and investigate the influential factors enriching the visitors' experience at such a site, using Al-Khandaq battle site as the case study. Forty-two respondents were interviewed at the site and NVivo 12 pro software was used to code and analyze the responses. The study explored tourist motivations, expectations, and perceptions as the guiding constructs in detailed qualitative analysis.  Foremost, learning, reliving the experience of the events of the battle, and Islamic values were the primary motivation to the historic site visitation. Next, findings reveal the extent to which tourists' expectations can be met through the availability of an open museum, accessibility, and the spatial and experiential simulation of the ancient Al-Khandaq path.  Lastly, the need to reconstruct the historical site in spatial planning and experiential dimensions formed the main thrust of the element of visitors' perception.  Based on the foregoing, the study recommends that Al-Khandaq site should be developed traditionally as an open museum, displaying both religious and historical elements of the battle with emphasis on the visual connection to the Prophet's mosque

scholarly journals Virtual Mechanical Product Disassembly Sequences Based on Disassembly Order Graphs and Time Measurement Units

2019 ◽  
Vol 9 (17) ◽  
pp. 3638 ◽  
Author(s):  
Francia ◽  
Ponti ◽  
Frizziero ◽  
Liverani
Keyword(s):  
Life Cycle Assessment ◽  
Process Design ◽  
Time Measurement ◽  
Personal Knowledge ◽  
Mechanical Assembly ◽  
Optimal Sequence ◽  
Measurement Units ◽  
Product Disassembly ◽  
Total Life

Recently, the approach that defines the total life cycle assessment (LCA) and the end of life (EoL) in the early design phases is becoming even more promising. Literature evidences many advantages in terms of the saving of costs and time and in the fluent organization of the whole design process. Design for disassembly (DfD) offers the possibility of reducing the time and cost of disassembling a product and accounts for the reusing of parts and of the dismantling of parts, joints, and materials. The sequence of disassembly is the ordered way to extract parts from an assembly and is a focal item in DfD because it can deeply influence times and operations. In this paper, some disassembly sequences are evaluated, and among them, two methods for defining an optimal sequence are provided and tested on a case study of a mechanical assembly. A further sequence of disassembly is provided by the authors based on experience and personal knowledge. All three are analyzed by the disassembly order graph (DOG) approach and compared. The operations evaluated have been converted in time using time measurement units (TMUs). As result, the best sequence has been highlighted in order to define a structured and efficient disassembly.

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.

scholarly journals Implementation at Hanze University of Applied Sciences

2012 ◽  
Vol 4 (2) ◽  
pp. 240
Author(s):  
Antoinette Bos
Keyword(s):  
Applied Sciences ◽  
Risk Management ◽  
Paradigm Shift ◽  
Lessons Learned ◽  
Main Thrust ◽  
Best Value ◽  
University Of Applied Sciences ◽  
It Project ◽  
The U.S

Best Value PIPS has become popular in the Netherlands and at the Hanze UAS. Hanze UAS started its first BV PIPS project in June 2011 and is currently performing seven projects. The Hanze UAS encountered major difficulties in the clarification period with an IT project. Therefore the main thrust of this paper is to explore the clarification and risk management phase. For this purpose the author uses an IT project as a case study. The conclusion is that it is in the clarification phase that the major paradigm shift takes place. BV practitioners must understand that the clarification phase is critical in the changing of the paradigm. The client and the vendor must continually implement the new BV concepts and lessons learned. This case study is similar to projects in the U.S., where the culture of the organization is the biggest challenge to the BV system.

Social Media

2021 ◽  
Vol 11 (1) ◽  
pp. 31-44
Author(s):  
Yinka Olomojobi ◽  
Odusanya Temitope Omotola
Keyword(s):  
Social Media ◽  
Political System ◽  
Symbiotic Relationship ◽  
Economic Base ◽  
Key Factors ◽  
Main Thrust ◽  
Case Study Analysis ◽  
Security Challenges ◽  
The World

Terrorism is ubiquitous. Most states around the world have experienced some form of terrorism. Terrorism has undermined the profile of Nigeria and has generated a tense and fragile political system. This paper underscores that the prevalence of grievance and the lack of an innovative economic base in Nigeria are amongst the key factors that stimulate terrorism in the state. In Nigeria, terrorist activities have become endemic. A cursory look on these activities has proven that social media has become a source for propagating terrorism. This has generated multifarious security challenges as well. This paper is aimed at analyzing terrorism and social media. It further proceeds to examine the main thrust of the paper submitting that social media is a viable tool for terrorists. From this standpoint, the paper explores a case study analysis to further explain and evaluate the symbiotic relationship between social media and terrorism in Nigeria.

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

Culture and the plasticity of perception

2020 ◽  
Vol 43 ◽  
Author(s):  
Michael Lifshitz ◽  
T. M. Luhrmann
Keyword(s):  
Cultural Context ◽  
Sensory Experience ◽  
Cultural Learning ◽  
The World

Abstract Culture shapes our basic sensory experience of the world. This is particularly striking in the study of religion and psychosis, where we and others have shown that cultural context determines both the structure and content of hallucination-like events. The cultural shaping of hallucinations may provide a rich case-study for linking cultural learning with emerging prediction-based models of perception.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

Sign in / Sign up

Export Citation Format

Share Document