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Pulsed-Laser Direct Writing Of Biological Materials, Yafu Lin
Pulsed-Laser Direct Writing Of Biological Materials, Yafu Lin
All Dissertations
Laser direct writing, developed based on modified laser-induced forward transfer (LIFT), has been emerging as one of the most promising biofabrication techniques. While some studies have been conducted to investigate laser direct writing of biological materials, there are some key challenges such as mechanisms of bubble formation, droplet formation and process-induced cell injury that have not been well elucidated. The objective of this dissertation is to study laser-induced droplet formation dynamics and process-induced cell injury in pulsed-laser direct writing of biological materials, and improve the existing laser direct-write techniques.
Phase explosion is identified as the dominant bubble formation mechanism in …
A Computational Method For Analysis Of Material Properties Of A Non-Pneumatic Tire And Their Effects On Static Load Deflection, Vibration And Energy Loss From Impact Rolling Over Obstacles, Akshay Narasimhan
All Theses
One of the potential sources of vibration during rolling of a non pneumatic tire is the buckling phenomenon and snapping back of the spokes in tension when they enter and exit the contact zone. Another source of noise was hypothesized due to a flower pedal ring vibration effect due to discrete spoke interaction with the ring and contact with the ground during rolling as the spokes cycle between tension and compression. Transmission of vibration between the ground force, ring and spokes to the hub was also considered to be a significant contributor to vibration and noise characteristics of the Tweel. …
Predictive Energy Management In Connected Vehicles: Utilizing Route Information Preview For Energy Saving, Chen Zhang
Predictive Energy Management In Connected Vehicles: Utilizing Route Information Preview For Energy Saving, Chen Zhang
All Dissertations
This dissertation formulates algorithms that use preview information of road terrain and traffic flow for reducing energy use and emissions of modern vehicles with conventional or hybrid powertrains. Energy crisis, long term energy deficit, and more restrictive environmental protection policies require developing more efficient and cleaner vehicle powertrain systems. An alternative to making advanced technology engines or electrifying the vehicle powertrain is utilizing ambient terrain and traffic information in the energy management of vehicles, a topic which has not been emphasized in the past. Today's advances in vehicular telematics and advances in GIS (Geographic Information System), GPS (Global Positioning Systems), …
A Study Of The Statistics Of The Air/Water Interfacial Temperature Field During Mixed Convection Heat Transfer, Jie Kou
All Dissertations
Heat transfer across an air/water interface is of particular importance to limnology, oceanography and some industrial applications. The relationship between the statistics of the air/water interfacial temperature field and the interfacial heat flux is poorly understood, particularly for the mixed convection condition, which is a common heat transfer mechanism for small inland lakes. The few studies that have been conducted under mixed convection conditions have been limited to an uncontrolled surfactant condition (tap water). Therefore, in this dissertation research two sets of experiments for wind speeds from 0 to 4 m/s were conducted: controlled surfactant contaminated conditions (with oleyl alcohol) …
A Computational Investigation Of Contact Pressure For A Non-Pnemautic Wheel With A Meta-Material Shear Band, Renuka Jagadish
A Computational Investigation Of Contact Pressure For A Non-Pnemautic Wheel With A Meta-Material Shear Band, Renuka Jagadish
All Theses
One of the missions of National Aeronautics Space Administration (NASA) is to develop a vehicle that can travel for a longer distance on the moon and have a greater degree of mobility compared to the currently used Lunar Roving Vehicles (LRV). This led to the development of the All-Terrain Hex-Limed Extra-Terrestrial Explorer (ATHLETE), which requires a significant advance in the type of wheels that must be used on this highly mobile lander. The Michelin Lunar Wheel, which is a non-pneumatic tire invented by Michelin Researche et Technologie has been identified as one of the key designs capable of performing on …
Incorporating Function Structures Into Morphological Charts: A User Study, Jenkins Richardson Iii
Incorporating Function Structures Into Morphological Charts: A User Study, Jenkins Richardson Iii
All Theses
A morphological chart is an ideation tool that represents a large qualitative design space. Currently, morphological charts use a function list to as the function representation of the design problem. Using the morphological chart means (solutions) that can perform each function are generated. Combining one means from each function produces an integrated conceptual design solution. By repeating this process with all possible combination contained in the morphological chart, a long list of conceptual design solutions will be generated, although not all will be practical. This long list of potential design solutions is difficult to analyze and there are limited systematic …
Analysis Of Alternative Manufacturing Processes For Lightweight Biw Designs, Using Analytical Hierarchy Process, Srinath Vijayakumar
Analysis Of Alternative Manufacturing Processes For Lightweight Biw Designs, Using Analytical Hierarchy Process, Srinath Vijayakumar
All Theses
The main objective of the analysis was to investigate the forming of Body in White (BIW) panels using alternative processes most suitable for replacing the conventional press working process in order to achieve a reduction in the total mass of the vehicle body structure. The selection of the alternatives was guided by multi criteria decision making tool, the Analytic Hierarchy Process (AHP). Here the alternatives were selected based on their relative importance to the different manufacturing attributes considered. The selected processes were applied to the manufacturing of different parts of BIW indicated in the BOM along with suggestion of the …
Mapping Problem And Requirements To Solution: Document Analysis Of Senior Design Projects, Shraddha Joshi
Mapping Problem And Requirements To Solution: Document Analysis Of Senior Design Projects, Shraddha Joshi
All Theses
Formulating and solving engineering problems and designing solutions that meet the established requirements are important skills that graduating engineering students need to possess. However, there are noticeable gaps in the literature with respect to understanding how the formulation of design problems and establishment of requirements affect the final design solution. This thesis is an initial attempt to understand the influence of level of detail of problem statement and requirements on the level of detail of final solution. In doing so, a document analysis of final reports from senior design class collected over a period of ten years from 1999 to …
Advanced Automotive Thermal Management - Operation Of An Electric Radiator Fan Array For Reduced Electric Power Consumption, Amit Jagarwal
Advanced Automotive Thermal Management - Operation Of An Electric Radiator Fan Array For Reduced Electric Power Consumption, Amit Jagarwal
All Theses
The depletion of fossil fuel reserves and the limited renewable energy resources have raised public awareness about the need to improve fuel efficiency in ground transportation vehicles. The internal combustion engine remains one of the primary industrial machines using gasoline or diesel fuel to produce mechanical work. In these engines, the cooling system performs the vital role of removing waste heat to ensure normal combustion processes in the cylinders. To accomplish this task, the radiator, the radiator fan(s), the thermostat valve, and the water pump operated by circulating cooling fluid through the engine block and rejecting heat to the atmosphere. …
Pulse Echo Ultrasonic Testing Of Adhesive Bonded Joints For Automotive Applications, Arun Ganapathi
Pulse Echo Ultrasonic Testing Of Adhesive Bonded Joints For Automotive Applications, Arun Ganapathi
All Theses
The growing prominence of adhesive bonding technology in automotive manufacture has necessitated the development of reliable and robust quality assurance techniques. Of the different Nondestructive testing technologies available, Ultrasonic testing has shown itself to be the most promising technique to satisfy the requirements in automobile production. The current work attempts to apply two variations of the Ultrasonic Pulse Echo technique namely Contact and Immersion testing for inspecting typical hem bonded automotive joints. The joints have been tested for disbond at the various metal-adhesive interfaces by using an ultrasonic scan comparison method which compares the acquired signals against a reference scan …
Mass And Assembly Time Reduction For Future Generation Automotive Vehicles Based On Existing Vehicle Model, Essam Namouz
Mass And Assembly Time Reduction For Future Generation Automotive Vehicles Based On Existing Vehicle Model, Essam Namouz
All Theses
This research presents method for evaluating the lightweightedness of a vehicle and an approach for vehicle assembly time savings potential developed through a case study. The Lazy Part Identification method for mass reduction specifically addresses those components whose primary purpose is to aid in manufacturing and assembly rather than to provide end-user function. Seven specific laziness indicators are described and illustrated: rigid-to-rigid connection, support for a flexible, non-moving part, positioning feature, duplicate geometry, fastener, bridging system, and material flow restriction. These indicators are used to evaluate individual vehicle components as part of a proposed method for identifying mass reduction potential. …