scholarly journals Investigation on Tool Deflection During Tapping

2021 ◽  
pp. 104-114
Author(s):  
Felix Geßner ◽  
Matthias Weigold ◽  
Eberhard Abele
Keyword(s):  
Value Chain ◽  
Surface Measurement ◽  
Beam Model ◽  
Loop Model ◽  
Tool Deflection ◽  
Model Framework ◽  
Mechanistic Approach ◽  
Geometric Uncertainty ◽  
Radial Forces ◽  
The Individual

AbstractTapping is a challenging process at the end of the value chain. Hence, tool failure is associated with rejected components or expensive rework. For modelling the tapping process we choose a mechanistic approach. In the present work, we focus on the tool model, which describes the deflection and inclination of the tool as a result of the radial forces during tapping. Since radial forces always occur during tapping due to the uneven load distribution on the individual teeth, the tool model represents an essential part of the entire closed-loop model. Especially in the entry phase of the tap, when the guidance within the already cut thread is not yet given, radial forces can lead to deflection of the tool. Therefore, the effects of geometric uncertainty in the thread geometry are experimentally investigated, using optical surface measurement to evaluate the position of the thread relative to the pre-drilled bore. Based on the findings, the tool deflection during tapping is mapped using a cylindrical cantilever beam model, which is calibrated using experimental data. The model is then validated and the implementation within an existing model framework is described.

The new strategic orientation in innovating hospitality logistics system

2014 ◽  
Vol 20 (2) ◽  
pp. 195-206
Author(s):  
Christian Stipanović ◽  
Elena Rudan
Keyword(s):  
Value Chain ◽  
Hospitality Industry ◽  
Dynamic Environment ◽  
Future Research ◽  
Loop Model ◽  
Modern Logistics ◽  
Resource Base ◽  
Intangible Resources ◽  
Strategic Orientations ◽  
Starting Point

Purpose – This paper investigates ways how to innovate logistics processes in the hospitality industry aimed at achieving spatio - temporal transformation of resource base into competitive advantages based on innovation and quality. Economic goal of modern logistics based on knowledge is to provide a unique experience for tourists at minimum cost in order to multiply operational profit. Operational profit has to be largely reinvested in the new strategic orientations as well as in new intangible resources generating excellence and recognizability of hospitality services. Design – The paper defines current and future ways of logistics processes optimization as well as strategies in the hospitality industry aimed at generating excellence both for tourists and sustainable development. It analyzes the role of knowledge management in the reconception of logistics processes based on the new strategic orientations in synergy with other business processes involved in the transformation of a classical company into a learning organization Methodology –Recent scientific literature is critically analyzed in the paper (hospitality logistics systems, new strategic orientations) and practical examples (various forms of Croatian hotels and hospitality companies) and determines the views of the authors referring to the new qualitative trends of modern logistics and sustainable value chain and excellence as a prerequisite for the development of a hospitality company. The causal loop model is used for generating significance of new strategic orientations aimed at innovation of logistics processes in the hospitality industry in a dynamic environment. Findings – The paper emphasizes the importance of intangible resources and new strategic orientations in new qualitative trends used in logistics management processes. It presents a starting point for the future research works to solve specific problem situations in practice. Originality – The paper suggests and provides arguments for concrete proposals applied in optimization of logistics processes based on knowledge and information (risk management in generating business decisions) and new strategic orientations and it also raises questions to anticipate future changes in the development of logistics processes and strategies.

Operationalising resilience in tropical agricultural value chains

2019 ◽  
Vol 24 (2) ◽  
pp. 271-300 ◽  
Author(s):  
Joshua Aboah ◽  
Mark M.J. Wilson ◽  
Karl M. Rich ◽  
Michael C. Lyne
Keyword(s):  
Value Chain ◽  
Food System ◽  
Raw Materials ◽  
Citation Network ◽  
System Level ◽  
Value Chains ◽  
Common Source ◽  
Content Type ◽  
The Individual ◽  
Stakeholder Interactions

Purpose The analysis of the concept of resilience in supply chain management studies mostly focuses on the downstream side of the value chain and tacitly assumes an unlimited supply of raw materials. This assumption is unreasonable for agricultural value chains, as upstream disruptions clearly have a material impact on the availability of raw materials, and indeed, are a common source of supply problems. This paper aims to present a framework for the operationalisation of the concept of socioecological resilience in agricultural value chains that incorporates upstream activities. Design/methodology/approach A citation network analysis was adopted to review articles. A conceptual framework is then advanced to identify elements of resilience and indicators relevant to tropical agricultural value chains. Findings There are limited studies that assess resilience in the food chain context. Flexibility, collaboration, adaptability and resourcefulness are key elements for assessing resilience at the individual chain actor level. However, the paper argues that adaptability is the relevant element for the assessment of resilience at an aggregate food system level because it considers the alteration of a system’s state of resilience. Practical implications The proposed framework and propositions accommodate stakeholder interactions in the value chain and could serve as a tool to guide the assessment of resilience in agricultural value chains. Originality/value This paper is one of the few to extend resilience to cover the socioecological interaction aspects for supply chains that yield the raw materials needed for continuity in channel-wide value creation processes.

An Impact Assessment of Goods and Services Tax in India Through Strategic Analysis Approach (SAA)

2019 ◽  
pp. 269-280
Author(s):  
Tripti Tripathi ◽  
Manoj Kumar Dash
Keyword(s):  
Value Chain ◽  
Swot Analysis ◽  
Analysis Approach ◽  
Strategic Analysis ◽  
Value Chain Analysis ◽  
Implementation Challenges ◽  
Goods And Services ◽  
Chain Analysis ◽  
The Government ◽  
The Individual

This chapter focuses on the need, requirements, implementation, challenges, and impact of the goods and services tax on the Indian economic scenario. The major stakeholders in the process are the Government of India (GOI), the individual states, the industry, the businesses, and the biggest tax reform since independence of India in 1947. Often considered as overdue, it seeks to remove the various shortcomings and the loopholes in the existing system of indirect taxation in the country. The GST bill saw more than a decade of political and economic upheaval in the country. Subsequently, it became an act on 8th September 2016. The various strategic analysis approach (SAA) of the GST mechanism (e.g., SWOT analysis, value chain analysis, PEST analysis, and SAP-LAP analysis) give an in-depth account of the various issues and potential challenges in the implementation of the GST.

scholarly journals Stability analysis for a single-point cutting tool deflection in turning operation

2019 ◽  
Vol 11 (6) ◽  
pp. 168781401985318
Author(s):  
Amon Gasagara ◽  
Wuyin Jin ◽  
Angelique Uwimbabazi
Keyword(s):  
Cutting Forces ◽  
High Speed ◽  
Cutting Tool ◽  
Single Point ◽  
Three Dimensional ◽  
High Speed Steel ◽  
Cutting Parameters ◽  
Depth Of Cut ◽  
Beam Model ◽  
Tool Deflection

In this article, a new model of regenerative vibrations due to the deflection of the cutting tool in turning is proposed. The previous study reported chatter as a result of cutting a wavy surface of the previous cut. The proposed model takes into account cutting forces as the main factor of tool deflection. A cantilever beam model is used to establish a numerical model of the tool deflection. Three-dimensional finite element method is used to estimate the tool permissible deflection under the action of the cutting load. To analyze the system dynamic behavior, 1-degree-of-freedom model is used. MATLAB is used to compute the system time series from the initial value using fourth-order Runge–Kutta numerical integration. A straight hard turning with minimal fluid application experiment is used to obtain cutting forces under stable and chatter conditions. A single-point cutting tool made from high-speed steel is used for cutting. Experiment results showed that for the cutting parameters above 0.1mm/rev feed and [Formula: see text]mm depth of cut, the system develops fluctuations and higher chatter vibration frequency. Dynamic model vibration results showed that the cutting tool deflection induces chatter vibrations which transit from periodic, quasi-periodic, and chaotic type.

scholarly journals Who Am I? An Ethnographic Study Exploring the Construction of Organizational and Individual Self among Indian IT Employees

2019 ◽  
Vol 9 (1) ◽  
pp. 72-83
Author(s):  
A. Venkataraman ◽  
Chandra Shekhar Joshi
Keyword(s):  
Value Chain ◽  
Job Insecurity ◽  
Ethnographic Study ◽  
The Self ◽  
It Industry ◽  
Labour Process ◽  
Gig Economy ◽  
Team Player ◽  
The Individual ◽  
Individual Self

The self is both a sociological and a psychological construct. It is investigated in this paper from the perspectives of sociology of work, critical management studies and employment relations. Accordingly, drawing upon ethnographic research, this article seeks to unravel how an employee defines herself or himself in two realms—the organizational and the personal—respectively against the background of changing Indian IT industry marked by uncertainty and rising job insecurity. It examines how these two realms converge to bring about an individual’s sense of ‘dasein’ or being. The self is entwined in the value chain of the Indian IT labour process and, within it, soft HRM discursive practices seek to constitute and mould the ‘disciplined confessional self’ who is supposed to be not only autonomous but a proactive and proactive team player. This article identifies the sources from which the self finds definitions and validation in the liquid modern context of the ‘gig economy’. It seeks to reflect upon the ramifications arising out of the interplay between Western and Indian managerial repertoires and, finally, the interplay of caste and class against changing Indian societal norms and expectations. In doing so, it looks at the micro and macro means through which the self seeks to obviate its incoherence and find resonance and fullness. Given the volatile political economy of the Indian IT industry labour process, much of the work is repetitive and fragmented, and individuals feel alienated and burnt out after the initial excitement of experiencing the Sapient or Cisco way of life. They adopt various coping mechanisms reminiscent of Burawoy’s (1985) respondents to fight job insecurity and to secure their peer group’s acceptance. Thus, the onus of negotiating inherent dualities for finding meaning in the organizational realm, and yet leaving room for a transcendental individual coherent self whose larger ‘internal conversation’ transcends the existential concern of the structured antagonism of the wage–employment relationship, lies upon the individual rather than the organization.

scholarly journals Holistic Assessment of Carbon Capture and Utilization Value Chains

Environments ◽  
2018 ◽  
Vol 5 (10) ◽  
pp. 108 ◽  
Author(s):  
Tryfonas Pieri ◽  
Alexandros Nikitas ◽  
Arturo Castillo-Castillo ◽  
Athanasios Angelis-Dimakis
Keyword(s):  
Value Chain ◽  
Carbon Capture ◽  
Carbon Capture And Storage ◽  
Holistic Approach ◽  
Value Chains ◽  
The European Union ◽  
Carbon Capture And Utilization ◽  
Holistic Assessment ◽  
The Individual ◽  
And Storage

Carbon capture and utilization (CCU) is recognized by the European Union, along with carbon, capture and storage (CCS), as one of the main tools towards global warming mitigation. It has, thus, been extensively studied by various researchers around the world. The majority of the papers published so far focus on the individual stages of a CCU value chain (carbon capture, separation, purification, transportation, and transformation/utilization). However, a holistic approach, taking into account the matching and the interaction between these stages, is also necessary in order to optimize and develop technically and economically feasible CCU value chains. The objective of this contribution is to present the most important studies that are related to the individual stages of CCU and to perform a critical review of the major existing methods, algorithms and tools that focus on the simulation or optimization of CCU value chains. The key research gaps will be identified and examined in order to lay the foundation for the development of a methodology towards the holistic assessment of CCU value chains.

A Computational Model for the Dynamics of Cerebrospinal Fluid in the Spinal Subarachnoid Space

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Eleuterio F. Toro ◽  
Ben Thornber ◽  
Qinghui Zhang ◽  
Alessia Scoz ◽  
Christian Contarino
Keyword(s):  
Cerebrospinal Fluid ◽  
Subarachnoid Space ◽  
Numerical Approach ◽  
Loop Model ◽  
Computationally Efficient ◽  
Spinal Subarachnoid Space ◽  
Inflow Condition ◽  
The Central Nervous System ◽  
Fluid Compartments ◽  
The Individual

Global models for the dynamics of coupled fluid compartments of the central nervous system (CNS) require simplified representations of the individual components which are both accurate and computationally efficient. This paper presents a one-dimensional model for computing the flow of cerebrospinal fluid (CSF) within the spinal subarachnoid space (SSAS) under the simplifying assumption that it consists of two coaxial tubes representing the spinal cord and the dura. A rigorous analysis of the first-order nonlinear system demonstrates that the system is elliptic-hyperbolic, and hence ill-posed, for some values of parameters, being hyperbolic otherwise. In addition, the system cannot be written in conservation-law form, and thus, an appropriate numerical approach is required, namely the path conservative approach. The designed computational algorithm is shown to be second-order accurate in both space and time, capable of handling strongly nonlinear discontinuities, and a method of coupling it with an unsteady inflow condition is presented. Such an approach is sufficiently rapid to be integrated into a global, closed-loop model for computing the dynamics of coupled fluid compartments of the CNS.

A Cascaded Optimization Approach for Modeling a Professional Driver's Driving Style

2020 ◽  
Vol 142 (9) ◽  
Author(s):  
Jeffery Ryan Anderson ◽  
Beshah Ayalew
Keyword(s):  
Optimization Approach ◽  
Loop Model ◽  
Driving Style ◽  
Professional Drivers ◽  
Optimization Framework ◽  
Optimal Weights ◽  
Predictive Controller ◽  
The Individual ◽  
Best Fit

Abstract In the context of minimum-time vehicle maneuvering, previous works have shown that different professional drivers drive differently while achieving nearly identical performance. In this paper, a cascaded optimization framework is presented for modeling individual driving styles of professional drivers. Therein, an inner loop model predictive controller (MPC) finds the optimal vehicle inputs that minimize a blended-cost function over each receding horizon. The outer loop of this framework is an optimization computation which finds the optimal weights for each local MPC horizon that best fit data obtained from onboard vehicle measurements of the targeted drivers to the simulation of the maneuver under the cascaded control. This cascaded optimization is exercised for a case study on Sebring International Raceway where two different professional drivers were able to achieve nearly identical lap times while adopting different driving styles. It will be shown that this framework is able to model key differences in style between the two drivers during a particular corner. The models of the individual drivers are then fixed, and another optimization is used to tune tire parameters to suit each driving style and illustrate the utility of the approach.

The Development of Distinct Choice Process Segments over Time: A Stochastic Modeling Approach

1982 ◽  
Vol 46 (2) ◽  
pp. 48-59 ◽  
Author(s):  
Donald R. Lehmann ◽  
William L. Moore ◽  
Terry Elrod
Keyword(s):  
Decision Making ◽  
Problem Solving ◽  
Stochastic Modeling ◽  
Information Acquisition ◽  
Response Behavior ◽  
Model Framework ◽  
Individual Level ◽  
Amount Of Information ◽  
The Individual ◽  
Over Time

This paper examines Howard's (1963) typology dividing decision making into extensive problem solving (ESP), limited problem solving (LSP), and routinized response behavior (RRB). Specifically, the amount of information accessed in a longitudinal experiment is studied. Information acquisition is modeled stochastically at the individual level, and the existence of two segments (LSP and RRB) is tested in a nested-model framework.

scholarly journals Adding Another Level Individual Responses to Globalization and Government Welfare Policies

2015 ◽  
Vol 4 (2) ◽  
pp. 399-426 ◽  
Author(s):  
Lena Schaffer ◽  
Gabriele Spilker
Keyword(s):  
Economic Globalization ◽  
Model Framework ◽  
Welfare Policies ◽  
Welfare Spending ◽  
Positive Attitudes ◽  
Active Labor Market Programs ◽  
Welfare Generosity ◽  
The Individual ◽  
Labor Market Programs ◽  
Compensation Hypothesis

Literature on the compensation hypothesis overwhelmingly concentrates on either the macro or micro level of the relationship between globalization and welfare spending. This paper explicitly addresses this shortcoming by using individual citizens and country-specific characteristics in a hierarchical model framework. We start by examining individual’s context-conditional reactions to actual economic globalization and welfare generosity; after which, we make the effect of actual economic globalization (welfare generosity) conditional on whether the individual is a globalization winner or loser. In contrast to theoretical expectations, our results indicate that actual economic globalization does not affect people’s perception in the manner expected by the compensation hypothesis. However, individuals display more positive attitudes toward globalization if welfare state generosity is proxied using government spending on active labor market programs.

Sign in / Sign up

Export Citation Format

Share Document