Recursos de colección

ETD at Indian Institute of Science (3.241 recursos)

Repository of Theses and Dissertations of Indian Institute of Science, Bangalore, India. The repository has been developed to capture, disseminate and preserve research theses of Indian Institute of Science.

Centre for Product Design and Manufacturing (cpdm)

Mostrando recursos 1 - 20 de 37

  1. Natural Hand Based Interaction Simulation using a Digital Hand

    Vipin, J S
    The focus of the present work is natural human like grasping, for realistic performance simulations in digital human modelling (DHM) environment. The performance simulation for grasping in DHM is typically done through high level commands to the digital human models (DHMs). This calls for a natural and unambiguous scheme to describe a grasp which would implicitly accommodate variations due to the hand form, object form and hand kinematics. A novel relational description scheme is developed towards this purpose. The grasp is modelled as a spatio-temporal relationship between the patches (a closed region on the surface) in the hand and the...

  2. Development of 2D and 3D Sketching Environment to Support Early Phases of Design

    Onkar, Prasad S
    The traditional pen-paper sketching is extensively used in the early stages of product design as it supports creative exploration of product concepts and provides a fluidic mode for the expression of ideas. The Computer Aided Design (CAD) models support the later stages of design and manufacturing process. Faithful conversion of the designer’s ideas from concept sketches to the CAD models is a skill intensive and time consuming exercise which reduces the overall productivity of the organization. Providing computer based support can help the designer, in several ways, by reducing demand on the skill and allow focusing more on creative exploration of the...

  3. Mechanical Characterization of Adhesively Bonded Jute Composite Joints under Monotonic and Cyclic Loading Conditions

    Mittal, Anshul
    Fiber-reinforced composites comprise an important class of lightweight materials which are finding increasing applications in engineering structures including body components of automobiles and aircraft. Traditionally, synthetic fibers made of glass, carbon, etc. along with a polymeric resin have constituted the most common composites. However, due to environmental concern, occupational health safety considerations, higher cost, etc., research has been focused on substituting synthetic fibers, especially glass fibers with safer, economic and biodegradable natural fibers. Due to the ease of availability and affordability in terms of cost, woven jute mats, among a wide variety of natural fiber-based reinforcements, offer a good choice...

  4. Feature-based Approach for Semantic Interoperability of Shape Models

    Gupta, Ravi Kumar
    Semantic interoperability (SI) of a product model refers to automatic exchange of meaning associated with the product data, among applications/domains throughout the product development cycle. In the product development cycle, several applications (engineering design, industrial design, manufacturing, supply chain, marketing, maintenance etc.) and different engineering domains (mechanical, electrical, electronic etc.) come into play making the ability to exchange product data with semantics very significant. With product development happening in multiple locations with multiple tools/systems, SI between these systems/domains becomes important. The thesis presents a feature-based framework for shape model to address these SI issues when exchanging shape models. Problem of...

  5. Semiotic Studies on Holistic Order in Product Design

    Ahmed, Saleem S
    ‘Holistic Order’ is a new term used in this study. In literature, its synonyms such as beauty, order, visual order, and aesthetic order have been in usage for a long time. Historical studies on arts & crafts from philosophical and aesthetic perspectives reveal that the term ‘beauty’ no longer holds the same meaning as it used to for centuries. ‘Holistic Order’ is the new term being proposed in place of ‘beauty’ in product design. It is argued that this term is more appropriate in present day context. Beauty has been a study of interest to philosophers, aestheticians, poets, artists, scientists,...

  6. Prediction of Physical Behavior of Rotating Blades under Tip-Rub Impact using Numerical Modeling

    Subramanya, S
    Rotating blades, which are the most critical components of any turbo-machinery, need to be designed to withstand forced vibrations due to accidental tip rub impact against inner surface of casing. These vibrations are typically dependent on operating conditions and geometric parameters. In the current study, a rotor test rig with a maximum tip speed capability of 144 km/hr has been developed for studying the dynamic behavior of representative jet engine compressor blades actuated by the closure of clearance between the tip of a given rotating blade and a sector of the inner lining of the casing. Ten different blade profiles...

  7. Studies on Glass Fiber-Reinforced Composites for CAE-Driven Design of Impact Safety Countermeasures

    Lakshmanan, P
    Man-made materials such as fiber-reinforced composites (FRCs) can be tailored for optimum performance in product design applications in terms of strength and weight. The current work is aimed at studying the behaviors of composite laminates based on E-glass CSM (Chopped Strand Mat) or WRM (Woven Roving Mat) plies with a polyester resin for impact protection applications. Detailed mechanical characterization of CSM and WRM laminates till failure is carried out for tensile, compressive and shear loads by varying manufacturing process, number of plies, and laminate thickness. The effect of fiber volume fraction on mechanical properties is shown. The efficacy of CSM...

  8. The Effect of Mismatch of Total Knee Replacement Components with Knee Joint : A Finite Element Analysis

    Kanyal, Rahul
    It has been noticed that the need for total knee replacement surgery is increasing for Asian region. A total knee replacement is a permanent surgical solution for a patient having debilitating pain in knee joint suffering from arthritis. In this surgery, knee joint is replaced with components made up of bio-compatible materials after which the patient can resume the normal day to day activities. Western population has bigger build compared to Asian population. Most of the total knee replacement prosthesis are designed for western population. When these total knee prosthesis are used for Asian population, they cause a mismatch leading...

  9. A Geometric Approach for Discrete and Statistical Reach Analysis for a DHM with Mutable Supports

    Reddi, Sarath
    Conventional ergonomics analysis involves building physical mockups and conducting simulated operations, such that the constraints experienced by the human subjects can be directly observed. The limitations of this approach are that, they are resource intensive, less flexible for testing design variability and difficult to involve large number of subjects to account for population variability and thus, it is a reactive approach. With the advent of computer aided techniques, efforts are on to support ergonomics analysis processes for proactive design approaches. To achieve this, real scenarios are being simulated in virtual environments which include induction of representative human subjects into such...

  10. A Geometric Approach for Discrete and Statistical Reach Analysis for a DHM with Mutable Supports

    Reddi, Sarath
    Conventional ergonomics analysis involves building physical mockups and conducting simulated operations, such that the constraints experienced by the human subjects can be directly observed. The limitations of this approach are that, they are resource intensive, less flexible for testing design variability and difficult to involve large number of subjects to account for population variability and thus, it is a reactive approach. With the advent of computer aided techniques, efforts are on to support ergonomics analysis processes for proactive design approaches. To achieve this, real scenarios are being simulated in virtual environments which include induction of representative human subjects into such...

  11. Methodologies for Assessment of Impact Dynamic Responses

    Ranadive, Gauri Satishchandra
    Evaluation of the performance of a product and its components under impact loading is one of the key considerations in design. In order to assess resistance to damage or ability to absorb energy through plastic deformation of a structural component, impact testing is often carried out to obtain the 'Force - Displacement' response of the deformed component. In this context, it may be noted that load cells and accelerometers are commonly used as sensors for capturing impact responses. A drop-weight impact testing set-up consisting of a moving impactor head with a lightweight piezoresistive accelerometer and a strain gage based compression...

  12. Methodologies for Assessment of Impact Dynamic Responses

    Ranadive, Gauri Satishchandra
    Evaluation of the performance of a product and its components under impact loading is one of the key considerations in design. In order to assess resistance to damage or ability to absorb energy through plastic deformation of a structural component, impact testing is often carried out to obtain the 'Force - Displacement' response of the deformed component. In this context, it may be noted that load cells and accelerometers are commonly used as sensors for capturing impact responses. A drop-weight impact testing set-up consisting of a moving impactor head with a lightweight piezoresistive accelerometer and a strain gage based compression...

  13. Synthesis of Conceptual Designs for Sensors

    Sarkar, Biplab
    National Programme on Micro and Smart Materials and Systems (NPMASS)

  14. Synthesis of Conceptual Designs for Sensors

    Sarkar, Biplab
    National Programme on Micro and Smart Materials and Systems (NPMASS)

  15. Sustainability by Design : A Descriptive Model of Interaction and a Prescriptive Framework for Intervention

    Devadula, Suman
    Introduction: Sustainability is humanity’s collective ability to sustain development that meets the needs of the present without compromising the ability of the future generations to meet their own needs. Preceding closely to the World Commission on Environment and Development (WCED) Report of 1987, the General Assembly has adopted the UN Declaration, in 1986 [GA RES. 41/128] and has re-emphasized its importance in the UN Millennium Declaration, 2000. Given this anthropocentric rights basis of sustainability it becomes necessary to understand what this ability and development are with respect to the individual human. Problems of relevance, whose resolution benefits more people in...

  16. An Integrated Framework for Supporting Decision Making During Early Design Stages on End-of-Life Product Disassembly

    Selvakumar, Harivardhini
    Product life cycle (PLC) is the cycle which every product goes through from introduction to eventual demise. There are several issues with the current life cycle of a product when looked from the environmental impact perspective. These are: 1) depletion of natural resources due to the use of virgin materials for production, 2) Consumption of substantial amounts of energy during manufacturing, assembly and use, and 3) production of large amounts of waste during the lifecycle including those at the End of Life (EoL) phase. These issues impact resource scarcity, adverse effects on the environment and loss of embodied energy as...

  17. Study of Synergy between Plastic Deformation Mechanisms, Tribo-oxidation And Mechanically Mixed Layers in Tribology Of Ti-6Al-4V Slid Against SS316L And Alumina

    Ashok Raj, J
    Alloys of titanium are highly preferred materials for their excellent strength to weight ratio but the tribological issues while using them has been posing challenging issues for the tribological analyst, which are still areas of active research. Ti-6Al-4V (Ti64) is the most popular alloy of titanium and our understanding of the fundamental mechanisms of wear and friction of this alloy is still not complete. Previous investigations related to the tribology of these alloys have suggested a synergistic effect of plastic deformation and tribo-oxidation. The present investigation described in this thesis explores the existence of one more mode, namely the formation...

  18. Study of Synergy between Plastic Deformation Mechanisms, Tribo-oxidation And Mechanically Mixed Layers in Tribology Of Ti-6Al-4V Slid Against SS316L And Alumina

    Ashok Raj, J
    Alloys of titanium are highly preferred materials for their excellent strength to weight ratio but the tribological issues while using them has been posing challenging issues for the tribological analyst, which are still areas of active research. Ti-6Al-4V (Ti64) is the most popular alloy of titanium and our understanding of the fundamental mechanisms of wear and friction of this alloy is still not complete. Previous investigations related to the tribology of these alloys have suggested a synergistic effect of plastic deformation and tribo-oxidation. The present investigation described in this thesis explores the existence of one more mode, namely the formation...

  19. Towards Automated Design of Toggle Switch Mechanisms

    Kalyan Ramana, G
    This work deals with addressing the issues related to design of double toggle switch mechanisms with emphasis on structural, dimensional and dynamic aspects. Currently, almost all the issues related to electrical switches are dealt from electromagnetic point of view; the operating mechanism is hardly touched. It is observed that kinematic parameters influence electrical performance of switch significantly. Therefore, there is a need to develop methodologies for supporting exploration of diverse kinematic chains (KCs) for this purpose. Visual inspection is tedious and error prone even when a complete list of design criteria is available, hence, the work presented in the thesis...

  20. Towards Automated Design of Toggle Switch Mechanisms

    Kalyan Ramana, G
    This work deals with addressing the issues related to design of double toggle switch mechanisms with emphasis on structural, dimensional and dynamic aspects. Currently, almost all the issues related to electrical switches are dealt from electromagnetic point of view; the operating mechanism is hardly touched. It is observed that kinematic parameters influence electrical performance of switch significantly. Therefore, there is a need to develop methodologies for supporting exploration of diverse kinematic chains (KCs) for this purpose. Visual inspection is tedious and error prone even when a complete list of design criteria is available, hence, the work presented in the thesis...

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