Ciencias Exactas y Ciencias de la Salud

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Fundamental Constitutive Modeling of Magnetorheological Fluid and its Application on Reconfigurable Systems. Semi-active Damper and Transmission Actuator
(Instituto Tecnológico y de Estudios Superiores de Monterrey, 01/05/2005) Villarreal González, Leopoldo S.; Dr. Jorge Armando Cortés Ramírez; Dr. Jaime Bonilla Ríos; Dr. Ciro A. Rodríguez González
Magnetorheological (MR) fluids belong to the general class of smart material whose rheological properties can be modified by applying a magnetic field. The most important advantage of these fluids over conventional mechanical interfaces is their ability to achieve a wide range of viscosity in a fraction of millisecond. According to bibliography and patent analyses a growing tendency around MR technology is observed and its application on reconfigurable systems is feasible. The main objective of this thesis is to describe the main parameters affecting the magnetorheological fluids by the creation of a constitutive expression that can be consider in the design of reconfigurable systems. In addition to conceptualize and to characterize two prototype systems; a semi-active damper and a transmission actuator. The thesis is divided in five chapters. First chapter refers to background analysis and aims, where the problem statement and the followed methodology are presented. Second chapter presents the state of the art, where MR technology and trends are analyzed. In the third chapter, the analysis of the MR fluid under different magnetic fields is carried out. Finally, in chapter four and five, applications related with semi-active damper and transmission actuator systems are characterized. The results obtained in this thesis are the identification of the main parameters which affect the magnetorheological fluids. Fundamental models expressions to determine the viscosity of MR to be considered in the design of reconfigurable systems are presented. Constitutive models of two kinds of systems: a transmission actuator and a semi-active damper system. Finally, due to its ability to be adjusted and its quick response to a magnetic field change, MR technology is a feasible way in the development of reconfigurable systems.
Value Stream Mapping as a Strategic Tool in Lean Transition. Waste Elimination and Creation of Value in Different Processes Management
(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2004-01-12) Sánchez Sánchez, Eduardo; Cabeza Aspiazu, Luis Vicente; Novau Dalmau, Alberto Enrique; González Flores, David; ITESM
The main objective of this work of thesis is the formulation of a frame of reference, by means of an analysis of the application of a Lean Manufacturing tool (Value Stream Mapping) in various processes of diverse companies of different maturity levels in the Manufacturing sector to help them see the optimizations that can be attained trough the use of this tool. In the development of this thesis, an investigation of Value Stream Mapping (Lean Manufacturing tool) and its strategy of implementation were made. The author of the present document made a series of practical cases applying this tool with the purpose of making an analysis in order to find the most important elements and then that would be useful to integrate them in a frame of reference. Once realized the analysis, the author developed and proposed a model as well as a frame of reference that can serve as guide for people whom they want to use the value stream map tool. The results obtained when applying the practical cases offer interesting results that allow to see the benefits that an organization could obtain when doing use of a tool like this, as well as, this investigation allows to see possible future investigations that they reinforce and they improve the model and the frame of reference proposed here.

Ciencias Exactas y Ciencias de la Salud

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