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Filtering by: Creator Liu, Z Remove constraint Creator: Liu, Z Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • Rebound predictions for elastic collisions

    Creator:
    Liu, Pao-pao
    Abstract:
    In this paper, a numerical method is used to predict the response of an elastic body during a collision in which both normal and tangential impulses are important. Results are compared with those from simplified prediction procedures, which stem from the assumptions that the energy-returning capacity of the normal deformation...
    Resource Type:
    Dissertation
    Full Text:
    OF THE THESIS OF Pao-Dao Liu for the degree of Doctor of Philosophy in Mechanical Engineering

  • Single Phase and Flow Boiling Heat Transfer and Flow Characterization in Microscale Pin Fin Heat Sinks

    Creator:
    Rasouli, Erfan
    Abstract:
    The ever increasing requirements for heat dissipation in various thermal management applications such as computer chip cooling and high power electronics have necessitated the need for novel thermal management techniques. Thermal management using heat sinks with microscale features is amongst the prominent techniques developed over the past two decades. In...
    Resource Type:
    Dissertation

  • A Framework to Evaluate the Risk of Human- and Component-related Vulnerability Interactions

    Creator:
    Irshad, Lukman
    Abstract:
    Most accidents and malfunctions in complex engineered systems are attributed to human error. However, a closer inspection would reveal that such mishaps often emerge as a result of poor design and human- and component-related vulnerabilities acting together. To fully understand and mitigate potential risks, the effects of such interactions between...
    Resource Type:
    Dissertation
    Full Text:
    like to thank my committee members Dr. Andy Dong, Dr. Chris Sanchez, and Dr. Judy Liu, whose inputs

  • Numerical simulation of cavitating bubble-laden turbulent flows

    Creator:
    Shams Sobhani, Ehsan
    Abstract:
    Many engineering devices and propulsion systems suffer from undesirable effects of cavitation; such as degradation in the efficiency of pumps and turbines, generation of noise and vibration on ship propeller, increased drag and erosion of propeller blade, etc. In spite of decades of research on this problem, detailed study of...
    Resource Type:
    Dissertation
    Full Text:
    numerically from the experimental work by [Liu and Katz, PoF, 08]. Flow statistics agreed very well to those

  • Rebound predictions of mechanical collisions

    Creator:
    Lai, Liang-Ju
    Abstract:
    Predictions of mechanical collisions between two bodies frequently cannot be completed by the impulse-momentum equation together with a complete description of the motion of the system at the initial contact. Additional account must be taken of the deformations and frictional interaction induced by the impulsive reaction force, where the bodies...
    Resource Type:
    Dissertation
    Full Text:
    of friction (Liu, 1991). But there still is no reliable method of evaluation of these quantities

  • Incremental Forming of Polymers at Room Temperature

    Creator:
    Davar Panah, Mohammad Ali
    Abstract:
    Single Point Incremental Forming (SPIF) is a forming process in which a fully clamped sheet is formed by a hemispherical ended tool that moves along a predefined 3D toolpath. The sheet is formed in a series of local deformations to reach its desired shape. Double Sided Incremental Forming (DSIF) includes...
    Resource Type:
    Dissertation
    Full Text:
    ......................................................................................................................... 45 Figure 2-2: Effect of Δz on failure modes and formed parts for funnel shaped PLA parts with Rf

  • Tracking of Melt Pool Motion Using Numerical Analysis of Laser Powder Bed Fusion

    Creator:
    Cox, Bryce
    Abstract:
    Laser Powder Bed Fusion (LPBF) is a process commonly used to create additively manufactured metal parts. The flexibility and complexity allowed by the LPBF process provides opportunity for significant advancement in multiple industries as parts can be customized in shape and function for specific needs. These benefits can be compounded...
    Resource Type:
    Dissertation
    Full Text:
    ………………………………………………………………………………………………………………. 76 27. The change in Z Position for multiple starting locations for the case of 75W and 200 mm/s

  • Experimental Investigations of the Unsteady Aerodynamics of Oscillating Airfoils Operating in the Energy Harvesting Regime

    Creator:
    Siala, Firas F.
    Abstract:
    The rising global trend to reduce dependence on fossil fuels has provided significant motivation toward the development of alternative energy conversion methods and new technologies to improve their efficiency. Recently, oscillating energy harvesters have shown promise as highly efficient and scalable turbines, which can be implemented in areas where traditional...
    Resource Type:
    Dissertation
    Full Text:
    , 2012; Liu et al., 2013; Xie et al., 2014). It is well understood that the propulsive efficiency of an

  • Computational Modeling of Smoldering Combustion in Wildland Fuels

    Creator:
    Jayasuriya, Waduge Jayani A.
    Abstract:
    Smoldering combustion in wildland fires is a critical phenomenon that needs in-depth study because it can initiate with weaker ignition sources, can persist for long periods, is difficult to suppress, and can transit to flaming combustion. Cellulose, hemicellulose, and lignin are the major organic constituents within biomass, in varying proportions...
    Resource Type:
    Dissertation
    Full Text:
    [39]. Chen, Rein, and Liu studied the relationship between bulk density and critical moisture content

  • Detecting fluid flows with bioinspired hair sensors

    Creator:
    Dickinson, Benjamin T.
    Abstract:
    Many animals detect prey or enhance their locomotion with information from hair-like receptors that are activated by local fluid flows. The utility of biological hair receptors has motivated the design of artificial hair sensors (AHS) for flow control applications where aerodynamic or hydrodynamic forces play a significant role in the...
    Resource Type:
    Dissertation
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    (FSR) at base of polymer AHC (right). Figures courtesy of C. Liu and group, MNTR lab, Northwestern