Academic literature on the topic 'Engaged/disengaged behavior'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Engaged/disengaged behavior.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Engaged/disengaged behavior"
1
George, Ginu, and Binoy Joseph. "A study on the relationship between Employee engagement and organizational citizenship with reference to employees working in travel organizations." Atna - Journal of Tourism Studies 10, no. 2 (July 1, 2015): 33–44. http://dx.doi.org/10.12727/ajts.14.3.
Full textAbstract:
All sectors across the globe have started looking at employee engagement as an opportunity because engaged employees always tend to perform better than not engaged or disengaged employees. Organization with engaged employees are always a strength to the organization as it has lot of positive outcomes. This article elucidates the relationship that exists between employee engagement and organizational citizenship behavior with reference to employees working in travel organizations.The study focuses on employees working in national and international travel organizations which arelocated in Bangalore. Data was collected with the help of an adapted questionnaire. The findings of the study will help the employers to understand the importance of these two factors and their present engagement and OCB level of the employees working in these organizations and take measures accordingly.
2
Gillet, Nicolas, Alexandre J. S. Morin, Christine Jeoffrion, and Evelyne Fouquereau. "A Person-Centered Perspective on the Combined Effects of Global and Specific Levels of Job Engagement." Group & Organization Management 45, no. 4 (January 22, 2020): 556–94. http://dx.doi.org/10.1177/1059601119899182.
Full textAbstract:
This study examines how the different dimensions of job engagement combine within different profiles of workers ( n = 264). This research also documents the relations between the identified job engagement profiles, demographic characteristics (gender, age, education, working time, and organizational tenure), job characteristics (work autonomy, task variety, task significance, task identity, and feedback), attitudes (affective and normative commitment), and psychological health (emotional exhaustion and ill-being). Latent profile analysis revealed four profiles of employees defined based on their global and specific (physical, emotional, and cognitive) job engagement levels: Globally Disengaged, Globally Engaged, Globally but not Emotionally Engaged, and Moderately Engaged. Employees’ perceptions of task variety and feedback shared statistically significant relations with their likelihood of membership into all latent profiles. Profiles were finally showed to be meaningfully related to employees’ levels of affective commitment, normative commitment, emotional exhaustion, and ill-being.
3
Zaidman-Zait, Anat, Pat Mirenda, Eric Duku, Tracy Vaillancourt, Isabel M. Smith, Peter Szatmari, Susan Bryson, et al. "Impact of personal and social resources on parenting stress in mothers of children with autism spectrum disorder." Autism 21, no. 2 (July 9, 2016): 155–66. http://dx.doi.org/10.1177/1362361316633033.
Full textAbstract:
This study examined the longitudinal associations between child behavior problems, coping strategies, social resources, and parenting stress in mothers of young children with autism spectrum disorder. Participants were 283 mothers who completed self- and child-report measures at the time of diagnosis and 2 years later. Hierarchical multiple regression was conducted to predict overall parenting stress. At diagnosis, the final model indicated that high levels of social support and mothers’ use of active engaged coping strategies were associated with lower levels of parenting stress. Conversely, high levels of child externalizing behavior problems, family dysfunction, and mothers’ use of disengaged coping strategies were associated with higher parenting stress. Two years later, high levels of parenting stress at diagnosis predicted increased parenting stress. In addition, high or increasing levels of social support predicted a decrease in parenting stress, while high or increasing levels of family dysfunction predicted increased stress. Finally, increased use of disengaged coping strategies and decreased use of active coping strategies over time predicted higher levels of parenting stress. Results are discussed in terms of their implications for the provision of targeted supports that are designed to enhance the personal and social resources available to mothers of children with autism spectrum disorder.
4
Duxbury, Linda, and Michael Halinski. "Dealing with the “Grumpy Boomers”: re-engaging the disengaged and retaining talent." Journal of Organizational Change Management 27, no. 4 (July 8, 2014): 660–76. http://dx.doi.org/10.1108/jocm-05-2014-0106.
Full textAbstract:
Purpose – The aging of the workforce and the impending labour force shortage at the skilled end of the labour market increases the need for organizations to understand how to “re-engage” older workers with low commitment and reduce the turnover intentions of committed older knowledge workers. The current study addresses this issue by using employee commitment and intent to turnover scores to classify older knowledge workers into four groups: Disengaged-Exiters, Engaged-High-Performers, Retired-on-the-Job and Exiting-Performers. The purpose of this paper is to identify a set of work factors and practices that predispose older knowledge workers to fall into one or another of the four groups and offer suggestions on how organizations can increase commitment and decrease intent to turnover of their older workers. Design/methodology/approach – The paper used survey data (n=5,588) from a Canadian national study on work, family and caregiving to test the framework. Data analysis was performed using a MANCOVA with one independent variable (Boomer group), four dependent variables (job satisfaction, non-supportive culture, supportive manager, work-role overload) and one covariate (gender). Findings – The results support the framework. The findings suggest organizations that wish to retain committed Baby Boomers need to address issues with respect to workload. Alternatively, organizations who wish to increase the commitment levels of Boomers who have “Retired-on-the-Job” need to focus on supportive management, organizational culture and career development. Originality/value – This paper contributes to the literature on organizational commitment and intent to turnover by re-conceptualizing the relationship between these traditional concepts.
5
Lðkðslð, Demet. "Necessary Conformism: An Art of Living for Young People in Turkey." New Perspectives on Turkey 48 (2013): 79–100. http://dx.doi.org/10.1017/s0896634600001898.
Full textAbstract:
AbstractThis paper focuses on the everyday life experiences of the post-1980 generation in Turkey–a generation stigmatized for being depoliticized and apathetic. Rather than accepting this stigmatizing view, however, this analysis aims to better understand young people's actual lived experiences. To do so, it adopts the concept of “necessary conformism” developed in previous empirical research. This concept offers an alternative analytical framework that transcends the engaged/disengaged or political/ unpolitical dichotomy in young people's social participation. Specifically, the application of this concept reveals that apathetic behavior may actually mask powerful discontent and suffering that can be expressed neither through conventional politics nor open resistance. The necessary conformism of young people, therefore, is not apathetic behavior, but the expression of an underlying discontent and often a hidden agony.
6
Li, Tim MH, Lucia Liu, and Paul WC Wong. "Withdrawal experience and possible way-outs from withdrawal behavior in young people." Qualitative Social Work 17, no. 4 (January 13, 2017): 537–55. http://dx.doi.org/10.1177/1473325016688369.
Full textAbstract:
The term NEET (not in employment, education, or training) has been increasingly applied to young people in Europe not engaged in the three systems mentioned. Young people who seclude themselves at home and progress to social withdrawal can be considered a NEET subgroup—the “disengaged.” This phenomenon was first identified in Japan, where such reclusive individuals are referred to as hikikomori, but youth social withdrawal has also been reported in other countries, including South Korea and Hong Kong. Research on youth social withdrawal has mainly focused on describing and identifying contributing factors to this withdrawal behavior. Very few studies have examined the transitional processes from the initial self-seclusion to later help-seeking. Examining the mechanisms behind the engagement process for helping professionals is important to guide social work services for this unique group of young people. We conducted a qualitative study involving semi-structured interviews with 30 socially withdrawn young people in Hong Kong. Thematic analysis conceptualized their social withdrawal processes into three subthemes: private status, de-friending spiral, and suspension of experiences. Three reasons for changing their withdrawal behavior were also identified: rebalancing one’s ideal self with reality, reconnecting with tuned-in people, and regaining momentum in life. This study provides practical implications for social workers to develop approaches to engage withdrawn young people.
7
Taratorkin, Alexander, Victor Derzhanskii, and Igor Taratorkin. "Dynamic loading of friction disks in automotive transmissions." MATEC Web of Conferences 317 (2020): 02002. http://dx.doi.org/10.1051/matecconf/202031702002.
Full textAbstract:
The article describes a refined method for design studies of friction disks that are integrated into automotive transmissions. A technique is presented to enable finding the natural frequency spectrum exhibited by disks as distributed mass multicomponent bodies. Grounds are given that explicate the necessity to evaluate the stability of oscillations when high-frequency dynamic processes evolve in a nonlinear system after friction clutches are disengaged and when friction clutches are being engaged and wavelike plastic deformations emerge giving rise to overheated spots. The article also sheds light on specific features inherent in the off-design behavior subsequent to the stopping of the clutch booster and pressure unbalance in the clutch booster plenums. The research studies have produced a number of technical solutions that reduce the amplitude of the high-frequency oscillations, which are generated after friction clutches are disengaged and result in plastic deformations of mating surfaces as well as disturbed axial movability of friction disks. They have substantiated the necessity that the relevant linear velocity should be restricted having determined the boundaries of tolerated linear velocities of revolving friction disks. The article presents results of researching into the processes consequent to pressure unbalance in the friction clutch booster plenums and proposes technical solutions to do away with its adverse effects.
8
Tomar, Jitendra Singh. "Employee Engagement Practices in IT Sector Vis-à-Vis Other Sectors in India." International Journal of Human Capital and Information Technology Professionals 8, no. 3 (July 2017): 1–14. http://dx.doi.org/10.4018/ijhcitp.2017070101.
Full textAbstract:
Employee engagement is an important notion built around the concepts of job satisfaction, employee commitment, retention of talent, that impacts organizational performance. The disengaged employees lead to loss of productivity, procedural imbalances, and decreased efficacy. Organizations are addressing the work force and their job performance, task performance, organizational citizenship behavior, productivity, discretionary effort, effective commitment, and continuance commitment. Engaged employees are emotionally connected with their organization, and are enthusiastic about their job and success of the organization. The employment engagement practices are soulfully needed to understand the employee, give them healthier environment to work, let them grow professionally, award them, and keep them happy, irrespective of the business sector. This study intends to explore the employee engagement practices in Indian IT Sector and compare them with the engagement practices in other leading sectors in India. The study also assesses various engagement attributes in Indian IT organizations.
9
Loscalzo, Yura, and Marco Giannini. "Clinical conceptualization of workaholism." Organizational Psychology Review 7, no. 4 (November 2017): 306–29. http://dx.doi.org/10.1177/2041386617734299.
Full textAbstract:
Workaholism is a behavioral addiction that, while widely studied, is still lacking a definition shared by the scientific community. The aim of this theoretical paper is to propose a new model that is at the same time comprehensive and easy to test, with an approach based on a critical analysis of the literature. We give particular attention to reviews of literature and theoretical and empirical papers published since 2011, because even the most recent reviews do not fully encompass the last few years. We proposed a comprehensive model, which defines workaholism as a clinical condition that is characterized by both externalizing (i.e., addiction) and internalizing (i.e., obsessive-compulsive) symptoms and by low levels of work engagement; from this there arises the distinction between disengaged and engaged workaholics (i.e., a less impairing subtype of workaholism). Finally, we propose DSM-like criteria for workaholism and a research agenda for future studies.
10
Yan, Grace, and Nicholas M. Watanabe. "The Liancourt Rocks: Media Dynamics and National Identities at the 2012 Summer Olympic Games." International Journal of Sport Communication 7, no. 4 (December 2014): 495–515. http://dx.doi.org/10.1123/ijsc.2014-0047.
Full textAbstract:
After the South Korean men’s soccer team beat its Japanese counterpart in the bronze-medal match at the 2012 London Olympics, South Korean player Park Jung-Woo celebrated with a banner that displayed Dokdo is our land. Dokdo is called the Liancourt Rocks in English, the sovereignty over which has been an ongoing point of contention between South Korea and Japan. This study conducts a critical discourse analysis to examine media representations of Park’s banner celebration, as well as the ensuing discussion in major Korean and Japanese newspapers. The analysis reveals a contrastive picture: The Korean media vocally approached Park’s behavior as an emotional response of self-righteous indignation and quickly enacted memories of Korea’s victimhood in World War II to make justifications, whereas the Japanese media participated in a relatively disengaged absence. Japan’s silence disclosed a glimpse into its rich postwar history of social conflict and political resistance. Such contrast is also indicative of how sport media can be engaged in nuanced social contexts, generating representations that serve nation-state regimes situated in different political dynamics.
Dissertations / Theses on the topic "Engaged/disengaged behavior"
1
MAQSOOD, RABIA. "ANALYZING AND MODELING STUDENTS¿ BEHAVIORAL DYNAMICS IN CONFIDENCE-BASED ASSESSMENT." Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/699383.
Full textAbstract:
Confidence-based assessment is a two-dimensional assessment paradigm which considers the confidence or expectancy level a student has about the answer, to ascertain his/her actual knowledge. Several researchers have discussed the usefulness of this model over the traditional one-dimensional assessment approach, which takes the number of correctly answered questions as a sole parameter to calculate the test scores of a student. Additionally, some educational psychologists and theorists have found that confidence-based assessment has a positive impact on students’ academic performance, knowledge retention, and metacognitive abilities of self-regulation and engagement depicted during a learning process. However, to the best of our knowledge, these findings are not exploited by the educational data mining community, aiming to exploit students (logged) data to investigate their performance and behavioral characteristics in order to enhance their performance outcomes and/or learning experiences. Engagement reflects a student’s active participation in an ongoing task or process, that becomes even more important when students are interacting with a computer-based learning or assessment system. There is some evidence that students’ online engagement (which is estimated through their behaviors while interacting with a learning/assessment environment) is also positively correlated with good performance scores. However, no data mining method to date has measured students engagement behaviors during confidence-based assessment. This Ph.D. research work aimed to identify, analyze, model and predict students’ dynamic behaviors triggered by their progression in a computer-based assessment system, offering confidence-driven questions. The data was collected from two experimental studies conducted with undergraduate students who solved a number of problems during confidence-based assessment. In this thesis, we first addressed the challenge of identifying different parameters representing students’ problem-solving behaviors that are positively correlated with confidence-based assessment. Next, we developed a novel scheme to classify students’ problem-solving activities into engaged or disengaged behaviors using the three previously identified parameters namely: students’ response correctness, confidence level, feedback seeking/no-seeking behavior. Our next challenge was to exploit the students’ interactions recorded at the micro-level, i.e. event by event, by the computer-based assessment tools, to estimate their intended engagement behaviors during the assessment. We also observed that traditional non-mixture, first-order Markov chain is inadequate to capture students’ evolving behaviors revealed from their interactions with a computer-based learning/assessment system. We, therefore, investigated mixture Markov models to map students trails of performed activities. However, the quality of the resultant Markov chains is critically dependent on the initialization of the algorithm, which is usually performed randomly. We proposed a new approach for initializing the Expectation-Maximization algorithm for multivariate categorical data we called K-EM. Our method achieved better prediction accuracy and convergence rate in contrast to two pre-existing algorithms when applied on two real datasets. This doctoral research work contributes to elevate the existing states of the educational research (i.e. theoretical aspect) and the educational data mining area (i.e. empirical aspect). The outcomes of this work pave the way to a framework for an adaptive confidence-based assessment system, contributing to one of the central components of Adaptive Learning, that is, personalized student models. The adaptive system can exploit data generated in a confidence-based assessment system, to model students’ behavioral profiles and provide personalized feedback to improve students’ confidence accuracy and knowledge by considering their behavioral dynamics.
Book chapters on the topic "Engaged/disengaged behavior"
1
Lacy, Debra L. "Employee Engagement and Learning for the Transformational Leader." In Interdisciplinary and Practical Approaches to Managerial Education and Training, 133–46. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-8239-8.ch008.
Full textAbstract:
Highly engaged employees are central to strong organizational outcomes. Nonetheless, consistency in maintaining high levels of engagement eludes most organizations. Disengaged employees are often toxic and cultivate negativity. An in-depth analysis of the drivers of employee engagement indicates that leadership is the strongest influencer of engagement. Bass's transformational leadership and the leader-member-exchange (LMX) theories outline characteristics of transformational leaders. The theories intersect where Bass posits is the stage in the relationship between leader and follower where leader behavior inspires followers to excel with no additional incentives needed. Training and development of the transformational leader who drives high engagement must take adult learning principles into account in recognition of the unique learning needs of adults.
2
Matto, Elizabeth C. "Conclusion." In Citizen Now. Manchester University Press, 2017. http://dx.doi.org/10.7228/manchester/9781526105677.003.0008.
Full textAbstract:
The final chapter highlights the lessons learned from the case studies as well as the research designs they inspire. Consideration also is given to the normative implications of research addressing youth political participation. Lastly, practical suggestions are offered of actions parents, educators, policymakers, and even young adults themselves can take in order to encourage and equip them to be active citizens. The texts concludes that there are limitations both with declaring young adults "disengaged" because their behavior is unlike previous generations and asserting that they’re "better engaged" without demonstrating that their efforts will serve the interests of their generation. Instead, there is value in taking both theoretical and practical steps to ensure that today's young adult - citizen now – is understood and fully participating in the political process.
3
Kokotsaki, Dimitra. "Engagement and Creativity in Music Education." In Student Engagement and Participation, 418–32. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2584-4.ch020.
Full textAbstract:
The wider benefits of active engagement with music throughout life have been well documented. There is evidence that playing a musical instrument and integrating music in the curriculum can have a range of positive effects on children's self-esteem, their social behavior and cognitive skills, such as creativity, spatial-temporal ability, reading, language and IQ score. Music is a vital part of children's everyday lives and schools have a major role to play in helping children develop a positive musical identity by encouraging active participation in musical activities. When children are actively involved in creative work in music, they are affectively, behaviorally and cognitively engaged with the creative task. This chapter concludes that there is a problem with lack of engagement in formal music education and that we need to do more to understand why many students are disengaged with music at school and put music to its proper place of being an integral part of students' lives.
4
Kokotsaki, Dimitra. "Engagement and Creativity in Music Education." In Advances in Multimedia and Interactive Technologies, 295–309. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0270-8.ch014.
Full textAbstract:
The wider benefits of active engagement with music throughout life have been well documented. There is evidence that playing a musical instrument and integrating music in the curriculum can have a range of positive effects on children's self-esteem, their social behavior and cognitive skills, such as creativity, spatial-temporal ability, reading, language and IQ score. Music is a vital part of children's everyday lives and schools have a major role to play in helping children develop a positive musical identity by encouraging active participation in musical activities. When children are actively involved in creative work in music, they are affectively, behaviorally and cognitively engaged with the creative task. This chapter concludes that there is a problem with lack of engagement in formal music education and that we need to do more to understand why many students are disengaged with music at school and put music to its proper place of being an integral part of students' lives.
5
Stets, Jan E., and Richard T. Serpe. "Identities in Everyday Life." In Identities in Everyday Life, 3–14. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190873066.003.0001.
Full textAbstract:
The research that provides the basis of this volume involves theoretical and empirical work on identities in everyday life. The work is divided into six areas, including psychological well-being; authenticity; morality; gender, racial, and sexuality issues; identities and groups; and identities over the life course. Among the many findings are that: (1) when people accumulate identities that are verified, they feel good about themselves; (2) individuals think carefully about what to include and exclude over social media to present an authentic view of themselves; (3) people can claim a high moral identity and still behave immorally by relying on strategies that disengage them from their immoral behavior; (4) having a prominent white identity may produce a preference for white spaces and networks; (5) those who engage in protests can formulate an activist identity by identifying with other participants; and (6) other individuals are very important in helping to shape our identities in adulthood.
6
Meyer, John P. "Design and Application of Employee Engagement Surveys." In Employee Surveys and Sensing, 86–102. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190939717.003.0006.
Full textAbstract:
This chapter provides an evidence-based guide to the design and application of employee engagement surveys. It begins with a discussion of the meaning of engagement and the importance of distinguishing it from related concepts such as job satisfaction and affective organizational commitment. Next, it addresses the question of “engagement with what?” Employees can be engaged (or disengaged) in specific tasks, the job itself, team projects, the organization’s mission, as well as other work and nonwork activities or entities. The behavioral implications of engagement in these various targets can be quite different, so it is important to consider carefully the intended target and the desired objectives of engagement when designing surveys. Finally, the chapter addresses the selection and measurement of key drivers of engagement. This information is useful in designing strategies for maintaining or building engagement. While the popular press is replete with “best practices” for fostering engagement, it is argued here that what works in one context will not necessarily work in another. However, research has identified a set of “best principles” that can be used to guide context-specific interventions. The chapter concludes with a set of recommendations for the design and administration of engagement surveys, interpretation and feedback of the results, and development of intervention strategies.
7
Johnson, Annette, Cassandra McKay-Jackson, and Giesela Grumbach. "Future Implications." In Critical Service Learning Toolkit. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190858728.003.0015.
Full textAbstract:
As presented in the case examples in Chapter 9, critical service learning (CSL) projects can be a tool for engaging young people in their school and neighborhood communities. Unfortunately, many US public schools may have limited resources (financial or personnel) to provide creative and innovative programming. (Spring, Grimm, & Dietz, 2008). However, a need still exists to ensure that all youth receive equal chances to succeed in school. According to Germain (2006), school mental health professionals such as school social workers should engage “the progressive forces in people and situational assets, and [effect] the removal of environmental obstacles to growth and adaptive functioning” (p. 30). Advocating against barriers that prevent equal access to resources is a cornerstone of social work practice, and CSL can be one vehicle by which equal opportunities are secured. As mentioned throughout this toolkit, CSL is appropriate for students at all tiers, including both regular education and students with disabilities. Many students who benefit from CSL projects and work with school- based social workers also receive special education support. Yet, even with targeted interventions, evaluative data from special education services continue to report poor outcomes for youth with emo¬tional and behavioral disorders (Lewis, Jones, Horner, & Sugai, 2010). Students who receive special education services may need additional supportive services to remain in and graduate from high school (Thurlow, Sinclair, & Johnson, 2002). According to 2010– 2011 data collected by the National Center for Education Statistics, more than 20% of students who received special education services dropped out of high school (US Department of Education, 2013). Approximately 20% of those students were diagnosed as emotionally disturbed, and 53% had a specific learning disability (US Department of Education, 2013). After controlling for gender, ethnicity, and socioeconomic status, youth with disabilities are still among those at greatest risk for dropping out of school. No single reason exists regarding why students disengage from school; the issue is multifaceted. Sinclair, Christenson, and Thurlow (2005) asserted that “practitioners and policymakers in search of empirically supported intervention strategies will need to rely on studies that examine secondary indica¬tors of dropout prevention, such as reduction in problem behavior through positive behavioral supports or increasing student’s affiliation with school through service learning programs” (p. 466).
Conference papers on the topic "Engaged/disengaged behavior"
1
Ma, Jianfeng, Changqing Qiu, and Shuting Lei. "Comparison of the Effects of Down Milling and Up Milling on the Tool Temperature in Machining of Ti-6Al-4V." In ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9450.
Full textAbstract:
Ti-6AL-4V is widely used in the industry for the high strength-to-weight ratio at elevated temperature, its excellent resistance to fracture and corrosion, and biological properties. However, Ti-6AL-4V is hard to manufacture for its reactive chemical properties and low thermal conductivity that causes high temperature on the tool surface. Prediction of the tool temperature distribution from different manufacturing ways, up and down milling, has great significance in predicting tool wear pattern (cutting speed, feed/tooth, and axial depth of cut) in corner milling on temperature of the tool rake face. The tool material used is general carbide and Johnson-Cook plastic model is utilized to model the behavior of the workpiece Ti-6AL-4V. A separate Abaqus heat transfer model is used to analyze the heat transfer process after the tooth disengages the workpiece and before it engages the workpiece again to predict change of temperature distribution during this cooling process. The comparison of the up milling and down milling on the tool temperature is conducted.
2
Ma, J., Patrick Andrus, Nick H. Duong, Marissa Fischer, Sridhar Condoor, and Shuting Lei. "Numerical Analysis of Tool Performance in Up Milling of Ti-6Al-4V Alloy." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38647.
Full textAbstract:
Ti-6Al-4V is widely used in industry because of its high strength-to-weight ratio at elevated temperatures, its excellent resistance to fracture and corrosion, and biological properties. However, Ti-6Al-4V is classified as hard-to-cut material because of its high chemical reactivity with most tool materials and its low thermal conductivity that causes high temperature on the tool face. Consequently, prediction of the tool temperature distribution has great significance in predicting tool wear pattern. In this research, Finite Element Method (FEM) is employed to conduct numerical investigation of the effects of cutting conditions (cutting speed, feed/tooth, and axial depth of cut) in corner up milling on temperature of the tool rake face. The tool material used is general carbide and the behavior of the workpiece Ti-6Al-4V is described by using Johnson-Cook plastic model. Because of the computational expense, a separate heat transfer model is built to analyze the heat transfer process after the tooth disengages the workpiece and before it engages the workpiece again to predict change of temperature distribution during this cooling process. This research provides helpful guidance for selecting tool cooling strategies in up milling Ti-6Al-4V alloy.
3
Sardar, Hemant M., Richard Barron, and Steve J. Green. "Model Development and Validation of the Semi-Active Roll Control (SARC) System." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43718.
Full textAbstract:
This paper presents some of the work done to model the dynamics of TRW’s semi-active roll control (SARC) actuator. The SARC system is designed to reduce vehicle body roll in a turn and to allow for improved ride and handling while driving straight ahead. The SARC system consists of a hydraulic actuator, vehicle state sensors and an electronic control unit (ECU). The vehicle state sensors and ECU are optional in that existing ESC/VSC elements could be used to control the actuator with the proper control algorithms. The actuator is a compact hydraulic unit consisting of a linear actuator, pressurized reservoir, and associated valves. It mounts between one end of the sway bar and the vehicle suspension, and essentially works to engage or disengage the sway bar. The model was developed to understand and predict the dynamic behavior of the actuator for simulated vehicle inputs. The model was developed in Matlab/Simulink and was validated against experimental test rig data. Model parameters were determined from experimental data and basic engineering principles. This included modeling the dynamics of the seal frictions and the multi-stage control valve. Different vehicle inputs were simulated and the behavior of the actuator under various load regimes was matched to experimental test-rig data. The results show that this model is a reasonably accurate representation of the dynamics of the physical system allowing for usage in controller development and synthesis, and integrating in to vehicle models for integrated software-in-loop (SIL) and hardware-in-loop (HIL) development.