Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 55 for “"design variable"”.
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Reliability Analysis of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Steel Beams
… resistance factors of DLS joints for different design scenarios. The sensitivity study quantifies the relative contribution of each design variable to the reliability index. Thereafter, an experimental database for CFRP strengthened steel beams that fail by debonding was compiled to determine …
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Analysis and design of composite curved frames
In this work, methods for rapid analysis and design of composite curved C-section frames subjected to axial tensile loading are developed. Failure is predicted using polynomial in-plane and interlaminar failure criteria. Interlaminar stresses can be directly computed only from three-dimensional …
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Fundamental design principles of novel MEMS based "Landau" switches, sensors, and actuators : Role of electrode geometry and operation regime
… we have advocated electrode geometry as a design variable for MEMS, and used MEMS as an illustrative example of "Landau" systems to advocate operation regime as a new design variable</p>
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A Model for Multidisciplinary Optimization for Containerships
This thesis describes a multidisciplinary design optimization approach to containership design. The method employs widely accepted regression equations for computing resistance, weights, building costs and operating costs. The current regulations governing freeboard and the Coast Guard wind heel …
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Convergence characteristics of the fully stressed design method for plane frames
… how the convergence rate of a fully stressed design method using a stress-ratio algorithm may be affected by manipulating various parameters. The parameters studied are: (1) selection of a design variable, (2) relationships between the variables of moment of inertia, area, and section modulus, …
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A study of some features of the fully stressed design algorithm
… the results of a study of the fully stressed design (FSD) of rigidly convected plane steel frames. The objective is to: (1) formulate the FSD algorithm consistent with the most recent AISC Manual of Steel Construction, (2) study the effect of some of the features of FSD on the final design, …
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Design optimization of active trailer differential braking systems for car-trailer combinations
… two ATDB controllers are proposed, which are designed using the Linear Quadratic Regulator (LQR) and 𝐻∞ robust control techniques. In order to design the ATDB controllers, a linear 3 degrees of freedom (DOF) and a linear 5-DOF model are generated and validated with a nonlinear CT model derived …
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Reinterpretation of space in a networked community
… significant reasons why architects dwell on the design of a space is because we believe that the physical environment will influence social and interpersonal relationships. Recognizing the limitations in the conventional design paradigms, this project brings the focus on the inhabitants' …
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Measuring the value of workspace architectural design : construction of the Workspace Communication Suitability Index (WOCSIT)
… to measure the impact of workspace architectural design on the value it generates for tenant organizations in terms of, without loss of generality, strengthening organizational identity and communication - two critical productivity factors. The hypothesis, then, is that there is a measurable …
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Statistical Surrogate Models for Robust Design Optimisation in Reduced Dimension
… is crucial for multi-query problems such as design optimisation. However, the design of these products depends on complex and often deterministic computational models that may be expensive-to-evaluate. Consequently, it is expedient to consider these models as black-box functions, such that …
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DESIGN METHODS FOR PRESSURE RELIEF WELL SYSTEMS AT DAMS AND LEVEES
… Corps of Engineers (USACE) analytical method to design relief well systems by calculating discharge and excess head along an infinite line of wells was developed from the 1930s – 1950s. The research presented here increases our understanding of the method’s history and uses analytical and …
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Optimization of luminescent solar concentrators
… widespread use of solar power, a method for designing optimal LSCs is required such that the advantages of concentrators can be utilized and the energy losses are minimized. In this work, a methodology for the analysis and optimization of LSC designs is given. This procedure begins with the …
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Fusion of correlated information in multifidelity aircraft design optimization
Models used in engineering design often face trade-offs between computational cost and prediction uncertainty. To ameliorate this problem, correlated models of varying fidelities are used together under different fidelity management strategies to produce accurate predictions while avoiding …
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Characterization and design of non-adiabatic micro-compressor impeller and preliminary design of self-sustained micro engine system
… 1 cm), this thesis defines concepts and designs to improve micro-turbomachinery and overall system performance. Three-dimensional Reynolds-averaged Navier-Stokes computations (FLUENT) have been carried out to quantify the performance limiting processes in micro-impellers. These processes …
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A consistent direct-iterative inverse design method for the Euler equations
… for the solution of the aerodynamic inverse design problem. Direct-iterative methods couple analysis and shape modification methods to iteratively determine the geometry required to support a target surface pressure. The proposed method includes a consistent shape modification method wherein …
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Riblets in the viscous sublayer : Optimal Shape Design of Microstructures
… of the cost function with respect to the design variable. A minimum is sought by using the steepest descent algorithm with step size according to Armijo rule. The necessary optimality conditions are derived and a sequence of admissible domains is built which tends to the optimal solution. …
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Study and development of low power consumption SRAMs on 28 nm FD-SOI CMOS process
Since analog circuit designs in CMOS nanometer (< 90 nm) nodes can be substantially affected by manufacturing process variations, circuit performance becomes more challenging to achieve efficient solutions by using analytical models. Extensive simulations are thus commonly required to provide a …
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Dynamic Friction Characterization of Tripod Constant Velocity (Cv) Joints: Experiments, Analysis and Modeling
… CV joint friction apparatus was designed, built and successfully used to measure the internal friction behavior of actual CV joints. The apparatus is capable of measuring a key performance parameter of friction under different realistic vehicle operating conditions of stroke …
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Design optimization for 2-D granular media with dissipation
… reaction force at the desired bead contacts. Two design approaches are presented: introducing interstitial beads and prescribing initial plastic compression in the system. Using the intruders presence or lack thereof as the design variable is a discrete optimization problem. It is necessary to …
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Topology Optimization of Multifunctional Nanocomposite Structures
This thesis presents the design of multifunctional structures through the optimal placement of nanomaterial additives. Varying the concentration of Carbon Nanotubes (CNTs) in a polymer matrix affects its local effective properties, including mechanical stiffness, electrical conductivity, and …
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