scholarly journals Case Study for Enhanced Accident Tolerance Design Changes

2014 ◽  
Author(s):  
Steven Prescott ◽  
Curtis Smith ◽  
Tony Koonce ◽  
Timothy Yang
Keyword(s):  
Tolerance Design ◽  
Design Changes

scholarly journals Case Study for Enhanced Accident Tolerance Design Changes

2014 ◽  
Author(s):  
Steven Prescott ◽  
Curtis Smith ◽  
Tony Koonce
Keyword(s):  
Tolerance Design ◽  
Design Changes

Exploring Effective Change Propagation in a Product Family Design

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Inayat Ullah ◽  
Dunbing Tang ◽  
Qi Wang ◽  
Leilei Yin
Keyword(s):  
Product Family ◽  
Design Structure Matrix ◽  
Change Propagation ◽  
Effective Change ◽  
Design Structure ◽  
Design Changes ◽  
Requirements Change ◽  
Change Impact ◽  
Design Requirements

Product family (PF) design is a widely used strategy in the industry, as it allows meeting diverse design requirements. Change propagation in any PF is difficult to predict. Consequently, while numerous design change management methodologies presently exist, their application is restricted to a single artifact. This issue is overcome in the present study. The proposed framework explores effective change propagation paths (CPPs) by considering the risks associated with design changes in the PF with the aim of minimizing the overall redesign cost. The propagated risk, which would result in rework, is quantified in terms of change impact and propagation likelihood. Moreover, a design structure matrix (DSM) based mathematical model and an algorithm for its implementation are proposed to investigate the change propagation across the PF. Finally, to demonstrate their effectiveness, a PF of electric kettles is examined in a case study. The study findings confirm that the proposed technique is appropriate for evaluating different CPPs in PF.

Use of Statistical Modelling Techniques for Simulation

1993 ◽  
Author(s):  
Ebrahim Mazharsolook ◽  
David C. Robinson ◽  
Jonathan D. Casey
Keyword(s):  
Quality Control ◽  
Statistical Modelling ◽  
Test Results ◽  
Final Test ◽  
Product Model ◽  
Design Changes ◽  
Discrete Manufacturing ◽  
Similar Product ◽  
Modelling Techniques

Abstract Statistical methods are explored for the use in modelling of discrete manufacturing. The developed methodologies based on Design of Experiments (DOE) and stepwise regression to obtain the product model are described. This model is then embedded within a software system which is used for simulation of design changes, process changes and disturbances. The software is used to predict final test results in respect of up-stream parameter changes. A case study is presented o show the implementation of this method of modelling in Quality Control of manufacture. This case study has successfully been implemented. The system is currently assisting the company in design of similar product. Feasibility of applying Artificial Intelligen (AI) techniques to Model-Based Quality Control (MBQC) is investigated. An outline of the future development of Hybrid MBQC is then presented.

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

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.

scholarly journals A FUZZY ANALYTIC NETWORK PROCESS METHOD FOR RISK PRIORITIZATION IN FREEWAY PPP PROJECTS: AN IRANIAN CASE STUDY

2015 ◽  
Vol 21 (7) ◽  
pp. 933-947 ◽  
Author(s):  
Alireza Valipour ◽  
Nordin Yahaya ◽  
Norhazilan Md Noor ◽  
Simona Kildienė ◽  
Hadi Sarvari ◽  
...  
Keyword(s):  
Negative Impact ◽  
Analytic Network Process ◽  
Financial Risks ◽  
Risk Prioritization ◽  
Political Risks ◽  
Risk Ranking ◽  
Design Changes ◽  
Network Process ◽  
Fuzzy Analytic Network Process

Risk assessment is one of the most important factors in achieving success in public-private partnership (PPP) projects. Some relationships between risks in freeway projects have been established. The occurrence of each risk can worsen the effects of others such as a negative impact of financial risks on construction risks. This paper is aimed at prioritizing significant risks in freeway PPP projects applying a fuzzy analytic network process (FANP) method for overcoming the problems of interdependencies and feedback among different risk-ranking alternatives. Data on the study have been collected through a literature review, an interview and a questionnaire survey distributed to experts in the field of freeway PPP projects. The obtained results have shown that financial, legal and political risks are the most significant groups, although improper design, changes in the value of granted lands and the termination of concession are the most important risks. The findings help with strengthening the capabilities of developing countries for risk management in freeway PPP projects.

Combined Lifting Analysis and Load Test of a Hook Foundation in a GRP Hull

2006 ◽  
Vol 5-6 ◽  
pp. 101-106
Author(s):  
S. Quinn ◽  
S.S.J. Moy ◽  
Keith Piggott
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Load Test ◽  
Element Analysis ◽  
Detailed Design ◽  
Reinforced Polymer ◽  
Design Changes ◽  
Physical Testing ◽  
Final Design

The combination of simulation and physical testing is powerful. In this case study Finite Element Analysis (FEA) and a 96 tonne load test were used to prove that the lifting points for a new semi-rigid inflatable rescue craft met their statutory requirements before full manufacture. The FEA was used to optimise the detailed design of the lifting points, without the need to test each different configuration, and the load test was used to prove the final design in practice, before full manufacture. The FEA showed that the bearing stresses in the Glass Reinforced Polymer (GRP) hull of the initial design were unacceptable and appropriate design changes were made from further analysis. However, to suitably risk manage the project a full load test was required to demonstrate that the revised lifting point details met their statutory requirements, before full manufacture of the new craft.

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

1969 ◽  
Vol 184 (1) ◽  
pp. 593-614 ◽  
Author(s):  
M. A. Satter ◽  
B. Downs ◽  
G. R. Wray
Keyword(s):  
Analytical Study ◽  
Design Stage ◽  
Acoustic Absorption ◽  
Noise Generation ◽  
Noise Emission ◽  
Design Changes ◽  
Damping Materials ◽  
Lower Noise ◽  
Made In

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.

scholarly journals Case Study on Numerical Calculation of a Disc Bush in the Disc Harrow in the Welding Version

Mechanika ◽  
2021 ◽  
Vol 27 (6) ◽  
pp. 513-520
Author(s):  
Paweł LONKWIC ◽  
Ireneusz USYDUS ◽  
Arkadiusz TOFIL ◽  
Tomasz KRAKOWSKI ◽  
Hubert RUTA ◽  
...  
Keyword(s):  
Numerical Calculation ◽  
Economic Factor ◽  
Production Waste ◽  
Agricultural Machinery ◽  
Production Processes ◽  
Design Changes ◽  
Current Production ◽  
Post Production ◽  
Product Effect

The optimization of production processes in companies comes down to two main measures influencing the economic factor. The first one is the reduction of interval micro-periods between operations, and the second is to use post-production waste as much as possible. These treatments apply to virtually all industries regardless of the final product effect. This article describes the application of a special welding device for welding the workpiece with a bush type, designed for fixing the plate in the plate gun. As a result of its application, a significant reduction of time needed to produce one bush has been achieved, and thus the amount of time in a unit of time has been increased. As part of the implementation work, the bush design changes were also made, which made it possible to reduce post-production waste not suitable for current production, but allowing its use for other purposes. The results of the work were implemented in the company producing agricultural machinery in Lublin.

Design for manufacture and assembly of a polycentric paediatric prosthetic knee

2019 ◽  
Vol 233 (14) ◽  
pp. 2566-2576 ◽  
Author(s):  
Taahirah Mangera ◽  
Frank Kienhöfer ◽  
Kristian Carlson ◽  
Mariette Conning ◽  
Tamsin Purkis ◽  
...  
Keyword(s):  
Element Analysis ◽  
Design For Manufacture ◽  
Assembly Time ◽  
Prosthetic Knee ◽  
Biomedical Equipment ◽  
Design Life ◽  
Design Changes ◽  
Small Parts ◽  
Assembly Analysis

Design for manufacture and assembly is a critical step in the product design life cycle. In this study, design for manufacture and assembly theory was applied to the design of a polycentric paediatric prosthetic knee to resolve assembly and manufacture issues prior to product prototyping. Assembly time and efficiency prior and subsequent to design for assembly analysis was calculated. By combining redundant parts and improving the ease of alignment, orientation, and insertion of various parts through modification of part features, a 10.1% increase in assembly efficiency was achieved. Design for manufacture analysis was then performed for die casting of the component. Undercut features were removed and replaced with the use of standard components, reducing the assembly time of the component by reducing the complexity of parts. Proposed design changes were verified using finite element analysis to simulate the loading conditions of a polycentric prosthetic knee as per the ISO10328:2006 standard for methods of testing prostheses. An overall improvement of 13.6% in assembly efficiency was achieved after the design for manufacture and assembly analysis. The improvement is due to the decrease in assembly insertion time and eliminating small parts and parts in areas that were difficult to access. The reduction in assembly time will directly reduce the labour cost for assembly of the manufactured product. This case study illustrates how design for manufacture and assembly theory can be applied to the design of biomedical equipment to reduce the need for prototype re-work and the consequent costs.

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