Publications

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    ABSTRACT: This paper describes the first phase of a Mechatronics Curriculum Development effort-the design of an ¿Introduction to Mechatronics¿ course, the infusion of mechatronics activities throughout the curriculum and in outreach activities, and assessment results. In addition, the relevance and impact of such a curriculum on the education of engineers in relation to the evolving global economy is discussed. The second and third phases of this effort included development of two advanced mechatronics courses and the formulation of a mechatronics curriculum, which will be addressed in a companion paper, ¿A 10-Year Mechatronics Curriculum Development Initiative: Relevance, Content, and Results-Part II¿ (IEEE Transactions on Education, vol. 53, no. 2, May 2010).
    IEEE Transactions on Education 06/2010; · 0.95 Impact Factor
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    ABSTRACT: This paper describes the second and third phases of a comprehensive mechatronics curriculum development effort. They encompass the development of two advanced mechatronics courses (¿Simulation and Modeling of Mechatronic Systems¿ and ¿Sensors and Actuators for Mechatronic Systems¿), the formulation of a Mechatronics concentration, and offshoot research activities in the mechatronics area. The first phase involved the design of an ¿Introduction to Mechatronics¿ course and the infusion of mechatronic activities throughout the curriculum and in outreach activities and has been described in a companion paper ¿A 10-Year Mechatronics Curriculum Development Initiative: Relevance, Content, and Results-Part I¿ (IEEE Transactions on Education, vol. 53, no. 2, May 2010).
    IEEE Transactions on Education 06/2010; · 0.95 Impact Factor
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    ABSTRACT: Cultural practices in India that dictate that individuals remove their footwear before entering homes and places of worship creates a challenge for visually-impaired people in identifying and collecting their footwear as they leave. This paper describes an interdisciplinary service-learning project, involving students in Electrical & Computer Engineering (ECE) and the Mechanical Engineering (ME) programs, whose goal is to design and develop assistive technologies to help ameliorate this situation. The paper outlines the relevant technological issues in this project, and discusses how this research might be incorporated into the existing pedagogical structure of both programs.
    Proceedings - Frontiers in Education Conference 01/2009;
  • A. Askari, S. Das
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    ABSTRACT: Structural failures by fracture in oil and petroleum industries can have severe consequences both in terms of loss of life and of economics. Material fabrication processes, such as welding and rolling, and plant environment, such as corrosive surroundings, lead to brittle fractures of oil and petroleum industry structures. Structures, such as pressure vessels, are constantly exposed to hydrogen in the presence of high pressure and moderate temperature. This leads to hydrogen embrittlement. Also, exposure to high pressure and temperature over time by itself ages the material, and leads to temper embrittlement. Hydrogen and temper embrittlements are the primary causes for brittle fracture. In this paper, the most common type of this complex interaction, namely that of the residual stresses in a welded thick wall pressure vessel subject to primary loading and exposed to an atmosphere that contains hydrogen at elevated temperature, is discussed and analyzed. A real case of a crack in a welded pressure vessel under high hydrogen partial pressure and moderate temperature is selected as a reference structure. A strategy that involves both modeling and use of data from previous experiments is established that can help in assessing the service life of such a structure that contains residual stress from processing, is cracked, and is exposed to a corrosive atmosphere.
    Journal of Materials Processing Technology. 03/2006; 173(1):1–13.
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    ABSTRACT: Today, it is very important for engineering programs to have their traditional program streams vested with clearly identifiable themes for each concentration area within a program, and for each theme to have a clear connection with all of the associated course requirements of an area. Over the past seven years, three new courses in Mechatronics have been developed at the University of Detroit Mercy for both ME and EE students, through a collaborative effort between faculty from the Mechanical and Electrical Engineering Departments. These are "Introduction to Mechatronics", "Modeling and Simulation of Mechatronics Systems", and "Sensors and Actuators". Using these developments as a springboard, an effort is currently underway to investigate the formulation of a new undergraduate concentration area in Mechatronics as part of the Bachelor's Degree in Mechanical Engineering. This paper outlines the effort, including the difficulties associated with having to work within the constraints of an existing curricular framework in a small college
    Frontiers in Education, 2005. FIE '05. Proceedings 35th Annual Conference; 11/2005
  • Shuvra Das, Ambar K. Mitra
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    ABSTRACT: The problem of cathode shape determination for a given anode shape in electrochemical machining is considered. An algorithm based on the boundary integral equation technique and non-linear optimization for this inverse problem is developed. The additional flux condition at the anode is used as the constraint in this ill-posed problem. Through an iterative process, the shape of the cathode is determined by minimizing a functional. The algorithm is tested on two examples. It is shown that the algorithm is consistently superior compared to published numerical techniques based on the embedding method or the method of the lines.
    International Journal for Numerical Methods in Engineering 06/2005; 35(5):1045 - 1054. · 2.06 Impact Factor
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    ABSTRACT: Not Available
    Frontiers in Education, 2003. FIE 2003. 33rd Annual; 12/2003
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    Shuvra Das, Mathias Klotz, F Klocke
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    ABSTRACT: A finite element-based model for the electric discharge machining (EDM) process is presented. The model uses process parameters such as power input, pulse duration, etc., to predict the transient temperature distribution, liquid- and solid-state material transformation, and residual stresses that are induced in the workpiece as a result of a single-pulse discharge. An attractive feature of the model is its ability to predict the shape of the crater that is formed as a result of the material removal. The model has been validated using experimental data, wherever possible. Extending the model to simulate the effects of multiple pulses will be undertaken in the near future.
    Journal of Materials Processing Technology. 01/2003;
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    ABSTRACT: The paper describes a comprehensive assessment plan that was carried out as part of an NSF-funded effort to integrate principles of mechatronics throughout the Mechanical and Electrical Engineering curricula at the University of Detroit Mercy. The project team consists of faculty members from three departments: Electrical and Computer Engineering, Mechanical Engineering, and Education. The focus of the article is a description of how the assessment results have been used to refine one curricular component of the project: the senior-level course in mechatronics. We present an overview of the project, a summary of the assessment framework, initial results of the formative assessment of the mechatronics course, and an evolving model of outcome based curriculum development
    Frontiers in Education Conference, 2000. FIE 2000. 30th Annual; 02/2000
  • Jonathan M. Weaver, Shuvra Das
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    ABSTRACT: The undergraduate mechanical engineering program at the University of Detroit Mercy(UDM) includes a required laboratory course in Mechanical Measurements. A recent NSF ILI grant made it possible to modernize ME361 by procuring four personal computers, data acquisition cards, Labview software, and many transducers and other needed items. All of the ME361 lab experiences were modernized as described in this paper.
    11/1999;
  • Mohan Krishnan, Shuvra Das, Ra A. Yost
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    ABSTRACT: The design of a new course in mechatronics is described, which will serve as the focal point of a wider curriculum development effort to integrate the teaching of mechatronic principles throughout the relevant engineering curricula at the University of Detroit Mercy. The course has a balanced combination of theory and application and seeks to impart competencies that are in great demand in the automotive industry, as well as in other engineering sectors. One of the prominent and innovative features of the course is that it is structured around instructional activities that are predominantly team-oriented and project-based.
    11/1999;
  • Shuvra Das
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    ABSTRACT: Due to lack of improvement and maintenance for many years, the material testing laboratory at University of Detroit Mercy had failed to keep up with the ever changing standards of industry. Equipment was old and unreliable and the curriculum was unexciting to the students. Improvement of this laboratory has been going on for the last few years. This paper describes modernization of the curriculum and laboratory facilities and the impact of this improvement on student learning.
    11/1999;
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    ABSTRACT: The internet has become a powerful tool for information exchange and communication. Modern day engineering graduates are expected to be adept at using the internet. In a new multi-disciplinary course on Mechatronics, effort has been made to integrate the use of web-based communication tools with in-class and out-ofclass activities. Goals of this effort were to teach the use of these tools and to implement effective and efficient communication among all parties involved. In this paper, features of the tools used, their effectiveness (or ineffectiveness) and the lessons that were learned are discussed in the context of a multi-disciplinary course.
    11/1999;
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    S. Das, S. Yost, M. Krishnan
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    ABSTRACT: The Internet has become a powerful tool for information exchange and communication. Modern day engineering graduates are expected to be adept at using the internet. In a new multi-disciplinary course on mechatronics, effort has been made to integrate the use of Web-based communication tools with in-class and out-of-class activities. Goals of this effort were to teach the use of these tools and to implement effective and efficient communication among all parties involved. In this paper, features of the tools used, their effectiveness (or ineffectiveness) and the lessons that were learned are discussed in the context of a multi-disciplinary course
    Frontiers in Education Conference, 1999. FIE '99. 29th Annual; 02/1999
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    J.M. Weaver, S. Das
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    ABSTRACT: The undergraduate mechanical engineering program at the University of Detroit Mercy (UDM) includes a required laboratory course in mechanical measurements. An NSF ILI grant made it possible to modernize ME361 by procuring four personal computers, data acquisition cards, Labview software, and many transducers and other needed items. All of the ME361 lab experiences were modernized as described in this paper
    Frontiers in Education Conference, 1999. FIE '99. 29th Annual; 02/1999
  • [Show abstract] [Hide abstract]
    ABSTRACT: The design of a new course in mechatronics is described, which will serve as the focal point of a wider curriculum development effort to integrate the teaching of mechatronic principles throughout the relevant engineering curricula at the University of Detroit Mercy, USA. The course has a balanced combination of theory and application and seeks to impart competencies that are in great demand in the automotive industry, as well as in other engineering sectors. One of the prominent and innovative features of the course is that it is structured around instructional activities that are predominantly team-oriented and project-based
    Frontiers in Education Conference, 1999. FIE '99. 29th Annual; 02/1999
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    ABSTRACT: This paper describes an effort in progress to achieve the integration of mechatronics principles throughout the engineering curriculum at the University of Detroit Mercy. This is done in the context of team-oriented, project-based design activities. The project also includes a hands-on outreach component for pre-college students
    Frontiers in Education Conference, 1999. FIE '99. 29th Annual; 02/1999
  • Shuvra Das, Ambar K. Mitra
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    ABSTRACT: An algorithm for solving an inverse problem in steady state heat conduction is developed. In this problem, the location and shape of the inner boundary of a doubly connected domain is unknown. Instead, additional experimental data are provided at several points on the outer boundary. Through an iterative process, the unknown boundary is determined by minimizing a functional. Convergence properties of the algorithm are examined, and the stopping criterion for the iterative process is developed from numerical experiments in a simple case. The scheme is shown to perform well for the complex case of an L-shaped crack in a square domain. 11 refs., 9 figs., 1 tab.
    Journal of Computational Physics 01/1992; 99(1):99-105. · 2.14 Impact Factor
  • Shuvra. Das
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    ABSTRACT: Typescript (photocopy). Thesis (Ph. D.)--Iowa State University, 1991. Includes bibliographical references.
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    Arif Baig, Imran Mahmood, Shuvra Das
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    ABSTRACT: Applications of micro-electromechanical systems (MEMS) in automobiles are fairly recent. The two most common examples of MEMS use in automobiles are in crash sensing for airbag deployment, and in manifold absolute pressure sensing. There are, however, several other areas where MEMS devices are expected to replace more traditional technologies within the next few years. MEMS devices/systems (e.g. sensors and actuators) have several vital advantages over more traditional technologies. Because of highly reliable batch processing techniques, large volumes of highly uniform devices can be produced at relatively low unit cost. Since MEMS have virtually no moving parts to wear out, they are extremely reliable and long lasting. With the advent of microprocessor compatibility imposed on many automotive sensor/actuator applications, silicon based MEMS sensors will have a very efficient interaction with the controlling microprocessors. With increasing use of MEMS devices in automotive applications, modeling and simulation of these devices will become more and more important. Although CAE has a very important place in the development cycle of the automobile, the CAE needed for MEMS has some significant differences. Because of the much smaller dimensions of MEMS devices, forces that are normally neglected in macro-structural CAE cannot be neglected any more. Behavior of material in bulk form is quite different from that in thin film form. MEMS devices exhibit the interaction of mechanical, electrical, magnetic, thermal, and other physical phenomena, and therefore simulation of these devices has to be able to capture this multi-physical interaction. This paper will discuss all these important issues that need to be addressed in MEMS modeling and illustrate them through actual simulation cases of MEMS devices.

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