Experimental Validation of Active Fixture Design Methodology

2014 ◽  
Author(s):  
Thomas N. Papastathis ◽  
Otto Jan Bakker ◽  
Svetan M. Ratchev ◽  
Atanas A. Popov
Keyword(s):  
Design Methodology ◽  
Design Procedure ◽  
Fixture Design ◽  
Optimal Layout ◽  
Test Bed ◽  
Optimal Position ◽  
Surface Finishes ◽  
Milling Operations ◽  
Active Clamp ◽  
The Difference

A design methodology for active and fully-active fixtures has been established previously. In this work the results of a part of the validation for the design are presented, namely the differences between two different layouts and the difference between application of an passive and active clamp. The test-bed consist of a reconfigurable fixturing system with an active clamp holding a thin-walled plate. For three cases passive and actively controlled clamping forces were exerted during a series of milling operations. These are (1) passive clamping at a suboptimal and (2) at the optimal position and (3) clamping with an actively controlled clamping force at the optimal clamping location. The previously proposed design procedure has been qualitatively validated since its predictions regarding optimal layout and adaptive clamping forces hold true, when comparing the surface finishes, which improve from case to case.

The Methodical Procedure for Designing of Clamping Jaws

2014 ◽  
Vol 693 ◽  
pp. 44-49
Author(s):  
Jarmila Oravcova
Keyword(s):  
Cutting Force ◽  
Design Methodology ◽  
Model Simulation ◽  
Design Procedure ◽  
Fixture Design ◽  
Clamping Force ◽  
Design Verification ◽  
Position Change ◽  
Ansys Simulation ◽  
Three Stages

The paper deals with the clamping fixture jaws procedure design. The clamping jaw design methodology developed summarizes complex factors. These factors affect the clamping jaws design for the workpiece. Methodical design procedure consists of three stages. Namely, there are input date summary, clamping fixture design and the last design verification. The ANSYS simulation was used for the verification developing methodology. The components model simulation aim has been studied impact of clamping force position change to the cutting force reactions change. Research was conducted with different positions of jaws.

scholarly journals Impact of Fixture Design Sheet Metal Assembly Variation

2002 ◽  
Author(s):  
Jaime A. Camelio ◽  
S. Jack Hu ◽  
Dariusz J. Ceglarek
Keyword(s):  
Sheet Metal ◽  
Design Methodology ◽  
Design Procedure ◽  
Fixture Design ◽  
Element Analysis ◽  
Sheet Metal Parts ◽  
Nonlinear Programming Methods ◽  
The Impact ◽  
Sheet Metal Assembly

This paper presents a new fixture design methodology for sheet metal assembly processes. The proposed approach focuses on the impact of fixture position on the dimensional quality of sheet metal parts after assembly, considering part and tooling variation and assembly springback. The optimization algorithm combines finite element analysis and nonlinear programming methods to find the optimal fixture position such that the assembly variation is minimized. The optimal fixture design methodology enables to significantly reduce the assembly variation in the presence of part and tooling variation. A case study is presented to demonstrate the design procedure.

scholarly journals Robust H∞ Loop Shaping Controller Synthesis for SISO Systems by Complex Modular Functions

2021 ◽  
Vol 26 (1) ◽  
pp. 21
Author(s):  
Ahmad Taher Azar ◽  
Fernando E. Serrano ◽  
Nashwa Ahmad Kamal
Keyword(s):  
Design Methodology ◽  
Closed Loop ◽  
Complex Analysis ◽  
Controller Design ◽  
Filter Design ◽  
Design Procedure ◽  
Elliptic Functions ◽  
Loop System ◽  
Closed Loop System ◽  
Loop Shaping

In this paper, a loop shaping controller design methodology for single input and a single output (SISO) system is proposed. The theoretical background for this approach is based on complex elliptic functions which allow a flexible design of a SISO controller considering that elliptic functions have a double periodicity. The gain and phase margins of the closed-loop system can be selected appropriately with this new loop shaping design procedure. The loop shaping design methodology consists of implementing suitable filters to obtain a desired frequency response of the closed-loop system by selecting appropriate poles and zeros by the Abel theorem that are fundamental in the theory of the elliptic functions. The elliptic function properties are implemented to facilitate the loop shaping controller design along with their fundamental background and contributions from the complex analysis that are very useful in the automatic control field. Finally, apart from the filter design, a PID controller loop shaping synthesis is proposed implementing a similar design procedure as the first part of this study.

scholarly journals Displacement-based design of precast hinged portal frames with additional dissipating devices at beam-to-column joints

2021 ◽  
Author(s):  
Andrea Belleri ◽  
Simone Labò
Keyword(s):  
Design Methodology ◽  
Linear Time ◽  
Design Procedure ◽  
Time History ◽  
Structural System ◽  
Additional Degree ◽  
Speed Up ◽  
Column Joint ◽  
Displacement Based ◽  
Mechanical Devices

AbstractThe seismic performance of precast portal frames typical of the industrial and commercial sector could be generally improved by providing additional mechanical devices at the beam-to-column joint. Such devices could provide an additional degree of fixity and energy dissipation in a joint generally characterized by a dry hinged connection, adopted to speed-up the construction phase. Another advantage of placing additional devices at the beam-to-column joint is the possibility to act as a fuse, concentrating the seismic damage on few sacrificial and replaceable elements. A procedure to design precast portal frames adopting additional devices is provided herein. The procedure moves from the Displacement-Based Design methodology proposed by M.J.N. Priestley, and it is applicable for both the design of new structures and the retrofit of existing ones. After the derivation of the required analytical formulations, the procedure is applied to select the additional devices for a new and an existing structural system. The validation through non-linear time history analyses allows to highlight the advantages and drawbacks of the considered devices and to prove the effectiveness of the proposed design procedure.

scholarly journals Assessing the impact of libraries – the role of ISO 16439

2018 ◽  
Vol 119 (1/2) ◽  
pp. 87-93 ◽  
Author(s):  
Claire Creaser
Keyword(s):  
Design Methodology ◽  
International Standards ◽  
Content Type ◽  
International Standard ◽  
The World ◽  
The Difference ◽  
Library Impact ◽  
The Impact

Purpose Library impact and how to evaluate it has been debated for a number of years. While the activity – the busy-ness – of the library is now routinely measured and described, the difference the library makes is less tangible and harder to measure. Libraries in all sectors and worldwide are grappling with this issue, and the purpose of this paper is to summarise international standards available to support them. Design/methodology/approach The first international standard concerning library impact, ISO 16439 Information and documentation – methods and procedures for assessing the impact of libraries, was published in 2014 after several years in development. Findings The standard describes a range of methods for assessing library impact which have been used across the world in a variety of libraries in all sectors. Originality/value This paper summarises the key methods described in the standard, and gives references for further reading.

Role of mall attractiveness in shaping fashion shopping orientation of apparel shoppers: a segmentation approach

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ajay Kumar ◽  
Anil Kumar Kashyap
Keyword(s):  
Cluster Analysis ◽  
Design Methodology ◽  
Economic Value ◽  
Variety Seeking ◽  
Content Type ◽  
Shopping Orientation ◽  
Intercept Survey ◽  
Segmentation Approach ◽  
The Difference

Purpose The purpose of this study is to identify distinct segments of apparel shoppers based on their fashion shopping orientation. The difference among the segments based on mall attractive dimension is also examined. Design/methodology/approach The data were collected through mall intercept survey from the mall shoppers. Samples of 375 respondents are used for data analysis purpose. Exploratory factor analysis is used to extract the factors of fashion shopping orientation and mall attractive dimensions while K-means cluster analysis is applied to identify the segments. Findings This study resulted in three factors of fashion orientation of apparel shoppers, i.e. fashion involvement, variety seeking and economic value, and four factors of mall attractive dimensions: convenience, entertainment, atmosphere and architecture design. Based on these factors, this study came out with three distinct segments of fashion shoppers: pragmatic shoppers, variety seeking shoppers and highly fashioned shoppers. These three segments are attracted towards the mall dimension differently. Originality/value This paper presents the three distinct profiles of fashion shoppers based on their fashion shopping orientation and mall attractive dimensions. The findings of this study may help retailers and mall developers to target mall visitors appropriately.

The response of majority employee-owned firms during the pandemic compared to other firms

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Joseph Blasi ◽  
Douglas Kruse ◽  
Dan Weltmann
Keyword(s):  
Design Methodology ◽  
Employee Ownership ◽  
Social Implications ◽  
Firm Level ◽  
Content Type ◽  
Rutgers University ◽  
Employment Trends ◽  
The Difference ◽  
Industry Membership ◽  
Practical Implications

PurposeThe purpose of this study is to understand how majority employee-owned firms responded to the pandemic compared to firms that were not majority employee-owned. The Employee Ownership Foundation partnered with Rutgers University and the SSRS survey firm to survey ESOP and non-ESOP firms about their responses to the COVID-19 pandemic. A key purpose of the survey was to estimate firm-level changes in employment from mid-January to August (current employment figures were adjusted to August 5 using BLS industry employment trends). The survey also looked at other forms of adjustment and responses to the pandemic as reviewed below. The focus in this study is on the differences between firms that are majority owned by ESOPs and those that are not.Design/methodology/approachThe survey included 247 executives from ESOP Association member companies and 500 executives from an SSRS business panel constructed to be representative of US companies with 50 or more employees. The survey started on August 5 and ended on September 23, 2020.Findings(1) Majority ESOP firms had employment declines from January to August that were on average only one-fourth as large as for other firms. The difference is maintained when controlling for industry membership. (2) Majority ESOP firms were more likely to be declared “essential,” but the lower employment cutbacks among majority ESOP firms remain among essential and non-essential businesses. As essential businesses, majority ESOP firms were more likely receive Paycheck Protection Program or other government pandemic assistance, but both assistance recipients and non-recipients had lower employment cutbacks among majority ESOP firms. (3) The extent of employment cutbacks was higher for non-managers than for managers, but the manager/non-manager gap was higher among other firms than among majority ESOP firms.Research limitations/implicationsThis study supports empirical findings done previously.Practical implicationsThis study suggests to non-EO firms what they can do.Social implicationsThis study suggests strengths of EO firms.Originality/valueA very original and one-of-a-kind dataset.

Comprehensive design methodology for an engine journal bearing

2000 ◽  
Vol 214 (4) ◽  
pp. 401-412 ◽  
Author(s):  
H Hirani ◽  
K Athre ◽  
S Biswas
Keyword(s):  
Film Thickness ◽  
High Speed ◽  
Design Methodology ◽  
Design Procedure ◽  
Maximum Pressure ◽  
Connecting Rod ◽  
Automotive Engine ◽  
Reciprocating Engine ◽  
High Power Output ◽  
Minimum Film Thickness

The trend towards high power output, high speed and low power loss in engines requires a better understanding of bearing behaviour. Research in this area is directed more towards different aspects involved in bearing analyses, rather than providing a comprehensive guideline on design of bearing. This effort compiles the design methodology for selection of diametral clearance and bearing length by limiting the minimum film thickness, maximum pressure and temperature. The design procedure is summarized on the basis of the existing rapid bearing analyses for evaluation of the journal trajectory, minimum film thickness and maximum pressure and simplified thermal analysis. A flow chart is provided for step-by-step bearing design. Finally, two case studies of engine bearings are described: one investigates the VEB bigend connecting-rod bearing for a large industrial reciprocating engine and the other a main crankshaft bearing for an automotive engine. The methodology translates into easy-to-use expressions and the overall procedure is outlined, using practical data to demonstrate how this can be employed effectively by users.

Understanding the difference of values-based motivation of managerial workers in spa businesses in Thailand

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Pornlapas Suwannarat
Keyword(s):  
Data Collection ◽  
Design Methodology ◽  
Cultural Background ◽  
Core Values ◽  
Operational Performance ◽  
Collection Method ◽  
Content Type ◽  
The Difference ◽  
Asean Countries ◽  
Practical Implications

PurposeThis study focuses on variations of the importance of core values through motivational domains of individuals by their cultural background. The effect of motivational domains on operational performance has also been investigated.Design/methodology/approachThe study used survey as the main data collection method to elicit data from managerial workers in spa businesses in four regions of Thailand. An unpublished database of spa businesses was provided to the study by the Thai Chamber of Commerce.FindingsSignificant variations of the importance of motivational domains of managerial workers can be found according to the subculture of each of the four regions of Thailand. In addition, the motivational domains have found their significant impact on worker operational performance.Research limitations/implicationsOne of the limitations of this study may be the distribution of samples because the study focuses on spa businesses, most of which in each region are located in big tourism provinces that may not be wholly representative of the characteristics of each region.Practical implicationsThis study will be of practical value for practitioners or managers of any firms since it is important to consider value variations when assessing the operational performance; workers, especially managerial workers, in each subculture may have different priorities in the motivational domains of their lives. This could affect their operational performance.Originality/valueThis is an original attempt to ascertain variations of core values through motivational domains by subculture. It fills a knowledge gap in under-researched area in the literature since so far a few studies have examined this issue in the ASEAN countries.

scholarly journals Inductive powering of subcutaneous stimulators: key parameters and their impact on the design methodology

2016 ◽  
Vol 26 (2) ◽  
Author(s):  
Carmen Godfraind ◽  
Adrien Debelle ◽  
Laurent Lonys ◽  
Vicente Acuña ◽  
Pascal Doguet ◽  
...  
Keyword(s):  
System Design ◽  
Medical Devices ◽  
Design Methodology ◽  
Design Procedure ◽  
Power Source ◽  
Critical Parameters ◽  
Primary Circuit ◽  
System Efficiency ◽  
Secondary Circuit ◽  
Implantable Medical Devices

Inductive powering of implantable medical devices involves numerous factors acting on the system efficiency and safety in adversarial ways. This paper lightens up their role and identifies a procedure enabling the system design. The latter enables the problem to be decoupled into four principal steps: the frequency choice, the magnetic link optimization, the secondary circuit and then finally the primary circuit designs. The methodology has been tested for the powering system of a device requirering a power of 300mW and implanted at a distance of 15 to 30mm from the outside power source. It allowed the identification of the most critical parameters. A satisfying efficiency of 34% was reached at 21mm and tend to validate the proposed design procedure.

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