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Articles 61 - 90 of 133
Full-Text Articles in Engineering
Examination Of Gain Scheduling And Fuzzy Controllers With Hybrid Reachability, Aaron W. Fifarek
Examination Of Gain Scheduling And Fuzzy Controllers With Hybrid Reachability, Aaron W. Fifarek
Browse all Theses and Dissertations
Modern aircraft with nonlinear flight envelopes predominately utilize gain scheduled controllers to provide stability of flight. Using gain scheduled control techniques, nonlinear envelopes can be linearized into collections of linear systems that operate under various system dynamics. Linear controllers approximate the nonlinear response over setpoints of operating conditions which allow traditional linear theory to be applied to maintain stability. Techniques to prove linear stability are well understood and realized in control systems, but when controllers are switched, interpolation methods must be used. Interpolation is necessary as gain scheduled systems do not have foundational switching paradigms as part of their realization …
Wideband Doa And Parameter Estimation Of Chirp Sources Using Dcft And Compressive Sensing, Luay A. Al Irkhis
Wideband Doa And Parameter Estimation Of Chirp Sources Using Dcft And Compressive Sensing, Luay A. Al Irkhis
Browse all Theses and Dissertations
Direction of Arrival (DoA) estimation of chirp sources has many applications in radar, sonar and medical imaging. This work considers DoA and parameter estimation of wide- band chirp sources by the use of Discrete Chirp Fourier Transform (DCFT), its Compres- sive Sensing formulation (CS-DCFT) and Distributed CS. DCFT is similar to traditional Discrete Fourier Transform (DFT) but with chirp ba- sis and two-dimensional search over chirp rate and chirp frequency. For chirp parame- ters estimation, the proposed Compressive Sensing (CS) formulation uses the parametric DCFT basis to achieve superior estimator performance in polynomial time using Orthog- onal Matching Pursuit (OMP) …
Feed-Forward Compensation Of Non-Minimum Phase Systems, Venkatesh Dudiki
Feed-Forward Compensation Of Non-Minimum Phase Systems, Venkatesh Dudiki
Browse all Theses and Dissertations
Due to inherent limitations posed by existence of zeros of a transfer function in the righthalfof the complex plane, known as non-minimum phase zeros, the issue of dealing withsuch zeros is extremely important in control of linear systems. Considerable literatureexists in control theory to try and minimize or eliminate the effect of non-minimum phasezeros. These include pole-zero cancellation, feedforward compensation, among others.These methods are only limited only to stable systems (systems with poles in the left halfof the complex plane); and will fail for systems that are unstable as well as non-minimumphase.This research focuses in designing feedforward compensators for unstable …
Hardware Security And Vlsi Design Optimization, Hao Xue
Hardware Security And Vlsi Design Optimization, Hao Xue
Browse all Theses and Dissertations
Microelectronic circuit is ubiquitous component of modern electrical devices. The increasing complexity and professionality of phases in microelectronic supply chain bring more global cooperation to integrated circuit (IC) production. Therefore, providing a secure environment for microelectronic circuit design does not ensure the integrity of the hardware since any participator of IC fabrication has the opportunity to implant a malicious alteration in original IC design. Especially overseas chip-fabrication is a vital potential threat for national defense products. In theory, anyone who has access to fabrication process can tamper with the original design, with the potential to change function, modify parametric properties …
Resonant Gate-Drive Circuits For High-Frequency Power Converters, Hur Jedi
Resonant Gate-Drive Circuits For High-Frequency Power Converters, Hur Jedi
Browse all Theses and Dissertations
The development trend of power converters motivates the pursuit with high density, high efficiency, and low cost. Increasing the frequency can improve the power density and lead to small passive elements and a fast dynamic response. Each one of these power converters must be driven by a gate-drive circuit to operate efficiently. Conventional gate-drivers are used up to frequencies of about 5 MHz and suffer from switching losses. Therefore, the development of switch-mode power supplies (SMPS) operating at high frequencies requires high-speed gate drivers. The presented research in this dissertation focuses on analysis, design, and development of new types of …
Thz Sources Based On Er-Doped Gaas Driven At Telecom-Fiber Wavelengths, Andrea Mingardi
Thz Sources Based On Er-Doped Gaas Driven At Telecom-Fiber Wavelengths, Andrea Mingardi
Browse all Theses and Dissertations
This dissertation entails the investigation of ultrafast photoconductive (PC) THz sources driven by fiber and semiconductor lasers around λ= 1550-nm to utilize commercial fiber-optic telecom technology. The preferred approach is to use GaAs with a high concentration of erbium, which has performed well when driven with laser sources at both 800 nm wavelength, through intrinsic photoconductivity, and 1550 nm, through extrinsic photoconductivity. Studies in the early 1990s showed that the Er doping level has a solubility limit of ~ 7 × 1017 cm−3 at 580 °C, above which erbium is incorporated into GaAs as ErAs nanoparticles which promote resonant absorption …
Switching Neural Network Systems For Nonlinear Tracking, Manoj Ghimire
Switching Neural Network Systems For Nonlinear Tracking, Manoj Ghimire
Browse all Theses and Dissertations
In this thesis, we consider the problem of tracking in complex nonlinear dynamical systems. While the Kalman filter is known to be the mean-squared error optimal tracker under linear dynamics and linear measurements, more sophisticated models and algorithms are required for complex dynamics. Here, we consider switching systems where the dynamical properties vary (''switch modes") over time. For example, the dynamics of a vehicle may switch as it transitions from interstate to urban conditions, human speech dynamics switch as speakers change, and stock market dynamics switch with discrete news events. In this work, we use mode-dependent neural networks to capture …
Chaotic Based Self-Synchronization For Rf Steganography Radar/Communication Waveform, Michael A. Gonnella
Chaotic Based Self-Synchronization For Rf Steganography Radar/Communication Waveform, Michael A. Gonnella
Browse all Theses and Dissertations
In this project, we continue previous CSR project entitled RF Steganography based Joint Radar/Communication Waveform Design to develop a bio-inspired secure low probability detection (LPD) radio frequency (RF) waveform that can serve multiple purposes simultaneously. Previously, we have developed an RF steganography based RF waveform to conceal a secure digital communication within a linear frequency modulated (LFM) chirp radar signal. By exploiting novel reduced phase shift keying modulation and variable symbol duration, the new waveform is resistant to time domain analysis, frequency domain analysis and cyclostationary analysis. However, to demodulate the hidden communication message, the intended receiver has to know …
Temperature Robust Longwave Infrared Hyperspectral Change Detection, Nicholas A. Durkee
Temperature Robust Longwave Infrared Hyperspectral Change Detection, Nicholas A. Durkee
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In this thesis, we develop and evaluate change detection algorithms for longwave infrared (LWIR) hyperspectral imagery. Because measured radiance in the LWIR domain depends on unknown surface temperature, care must be taken to prevent false alarms resulting from in-scene temperature differences that appear as material changes. We consider fewer variables. Examples using synthetic and measured data quantify the computational complexity of the proposed methods and demonstrate orders of magnitude reduction in false alarm rates relative to existing methods. Four strategies to mitigate this effect. In the first, pre-processing via traditional temperatureemissivity separation yields approximately temperature-invariant emissivity vectors for use in …
A Low Temperature Co-Fired Ceramic (Ltcc) Interposer Based Three-Dimensional Stacked Wire Bondless Power Module, Atanu Dutta
A Low Temperature Co-Fired Ceramic (Ltcc) Interposer Based Three-Dimensional Stacked Wire Bondless Power Module, Atanu Dutta
Graduate Theses and Dissertations
The objective of this dissertation research is to develop a low temperature co-fired ceramic (LTCC) interposer-based module-level 3-D wire bondless stacked power module. As part of the dissertation work, the 3-D wire bondless stack is designed, simulated, fabricated and characterized. The 3-D wire bondless stack is realized with two stand-alone power modules in a half-bridge configuration. Each stand-alone power module consists of two 1200 V 25 A silicon insulated-gate bipolar transistor (IGBT) devices in parallel and two 1200 V 20 A Schottky barrier diodes (SBD) in an antiparallel configuration. A novel interconnection scheme with conductive clamps and a spring loaded …
Low Cost Sms-Enabled Ekg For Use In Developing Countries, Gabriel Christ, Shachi Kakkar, Michael Mcelroy, Augustus Boling
Low Cost Sms-Enabled Ekg For Use In Developing Countries, Gabriel Christ, Shachi Kakkar, Michael Mcelroy, Augustus Boling
Interdisciplinary Design Senior Theses
According to official estimates, cardiovascular disease will become the leading cause of death in the developing world by 2020 [1]. This makes regular screening and early detection a priority for these regions. At present, such screening relies on stationary electrocardiogram (ECG) machines, but this technology has several drawbacks. Most machines are costly, stationary, and require a physician onsite to collect and interpret the data; as a result many isolated rural communities lack access to basic heart disease screening. In order to better meet the screening needs of these populations, we propose a twopart solution involving a simplified, inexpensive ECG device …
Rf Location Tracking: A Modular Antenna System Implementation, Alan Tao Feng, Razma Mogharrab, Carlos Rivera
Rf Location Tracking: A Modular Antenna System Implementation, Alan Tao Feng, Razma Mogharrab, Carlos Rivera
Interdisciplinary Design Senior Theses
From the Amazon Prime Air drone delivery service to the usage of unmanned aerial vehicles (UAV) in military operations, recent years have seen the development of autonomous flight technologies becoming one of the major research topics in the drone industry. Tracking the geographic position of drones is a crucial part of any autonomous flight, but the common methods of drone location tracking either have too large of an error margin or require extensive environmental setup. The aforementioned issues are major roadblocks in the advancement of autonomous flight operations. The proposed solution is a new and improved method to track the …
Vital Sensory Kit For Use With Telemedicine In Developing Countries, Alejandra Pacheco, Jose Hernandez, Antonio Maldonado-Liu, Natalie Arrizon
Vital Sensory Kit For Use With Telemedicine In Developing Countries, Alejandra Pacheco, Jose Hernandez, Antonio Maldonado-Liu, Natalie Arrizon
Interdisciplinary Design Senior Theses
In many developing countries, a large percentage of the population lacks access to adequate healthcare. This is especially true in India where close to 70% of the population lives in rural areas and has little to no access to hospitals or clinics. People living in rural India often times cannot afford to pay to see a doctor should they need to make the journey to a hospital. Telemedicine, a breakthrough in the past couple decades, has broken down the barrier between the patient and the physician. It has slowly been implemented in India to make doctors more available to patients …
Smart Safeguard, Stephen J. Marrone
Smart Safeguard, Stephen J. Marrone
Electrical Engineering
Smart Safeguard is designed to provide people with an affordable device that will notify the authorities when the buyer gets in a car crash. The device will operate off the 12V car power that is present in every car and use an accelerometer to detect if an accident has occurred. If an accident is detected the device will proceed to light up and make a noise until the passenger pushes a button on the device. If the passenger doesn’t push the button within 15 seconds the device, which is wirelessly connected to the passenger’s phone, will initiate a text to …
Design And Control Of Electronic Motor Drives For Regenerative Robotics, Taylor Barto
Design And Control Of Electronic Motor Drives For Regenerative Robotics, Taylor Barto
ETD Archive
Two regenerative motor drives, a voltage source converter and a bidirectional buck/boost converter, are studied for energy regeneration and joint trajectory tracking. The motor drives are applied to two different robotic systems—a PUMA560 robotic arm and a hip testing robot / prosthesis system. An artificial neural network controller is implemented with the two motor drives and provides joint trajectory tracking with an RMS error of 0.03 rad. The control signals produced by the artificial neural network contain a large amount of high frequency content which prevents practical implementation. A robust passivity-based motion controller is modified to include information about the …
Derivative-Free Kalman Filter-Based Control Of Nonlinear Systems With Application To Transfemoral Prostheses, S. Mahmoud Moosavi
Derivative-Free Kalman Filter-Based Control Of Nonlinear Systems With Application To Transfemoral Prostheses, S. Mahmoud Moosavi
ETD Archive
Derivative-free Kalman filtering (DKF) for estimation-based control of a special class of nonlinear systems is presented. The method includes a standard Kalman filter for the estimation of both states and unknown inputs, and a nonlinear system that is transformed to controllable canonical state space form through feedback linearization (FL). A direct current (DC) motor with an input torque that is a nonlinear function of the state is considered as a case study for a nonlinear single-input-single-output (SISO) system. A three degree-of-freedom (DOF) robot / prosthesis system, which includes a robot that emulates human hip and thigh motion and a powered …
Advanced Line-Follower Robot, Lei Wang
Advanced Line-Follower Robot, Lei Wang
ETD Archive
In this research, an Advanced Line-follower Robot (ALFR) was designed and built. The ALFR mainly consists of the sensor array (QTR-8A), the high-performance microchips (TMS320f28335, TMS320f28069) and two motors (BLY172S-24V-4000). The ALFR keeps the basic function of the Line-follower Robot (LFR) but applies more advanced control theories, such as Proportional Integral Derivative (PID), Active Disturbance Rejection Control (ADRC) and Iterative Learning Control (ILC). PID and ADRC have been tested in the ALFR. The ALFR control problems and the results have been discussed in this thesis. Suggestions are also provided for research on unsolved problems. In particular, the mathematical models of …
Experimental Verification Of A Generalized Control Method For Constant Switching Frequency Three Phase Pwm Boost Rectifier Under Extremely Unbalanced Operating Conditions, Divin Sujatha Krishnan
Experimental Verification Of A Generalized Control Method For Constant Switching Frequency Three Phase Pwm Boost Rectifier Under Extremely Unbalanced Operating Conditions, Divin Sujatha Krishnan
ETD Archive
This thesis presents experimental verification of a generalized control method for constant switching frequency Three-phase PWM Boost Type Rectifier under extremely unbalanced operating conditions in the power system. In this model, a hysteresis current controller has been implemented using a high-speed micro-controller to generate the gate signals. Even though a constant switching frequency was achieved in the previous model, while in simulation using MATLAB/Simulink, it wasn’t achieved experimentally due to the low processing speed of the DSpace processor ds1104. This problem has been resolved by using the “C2000 Delfino MCUs F28377S Launchpad ” from Texas Instruments to implement Hysteresis Current …
Information Driven Control Design: A Case For Pmsm Control, Han Zhang
Information Driven Control Design: A Case For Pmsm Control, Han Zhang
ETD Archive
The key problem in control system design was the selection and processing of information. The first part was to collect some system dynamics offline or online in a cost-effective manner and use them in the controller design effectively. Next was to minimize the phase lag in the feedback loop to ensure best performance and stability. A systematic information-driven design strategy was discussed. A few key problems in permanent magnet synchronous motor control were taken in a case study: the current loop and decoupling, velocity loop with position feedback and position estimation at low speed. An active disturbance rejection based integrated …
Analysis And Design Of High-Frequency Soft-Switching Dc-Dc Converter For Wireless Power Charging Applications, Abhishek V. Danekar
Analysis And Design Of High-Frequency Soft-Switching Dc-Dc Converter For Wireless Power Charging Applications, Abhishek V. Danekar
Browse all Theses and Dissertations
Wireless power transfer (WPT) technology is becoming attractive in a wide variety of applications such as electric-vehicle charging, induction heating, charging portable applications, industrial robots, and biomedical implants. Recent studies have shown various techniques to implement wireless power transfer and these techniques differ based on the type of applications. For example, for electric vehicle charging, the power levels are in the range 5 kW to 25 kW and the operating frequency is in the range 70 kHz to 110 kHz. On the other hand, for consumer applications, the power levels vary from a few watts to hundreds of watts and …
Gnss Receiver Testing And Algorithm Development, Rachael E. Kolker
Gnss Receiver Testing And Algorithm Development, Rachael E. Kolker
Browse all Theses and Dissertations
Many current GNSS Software Defined Receivers (SDRs) are often limited in what they can do across a range of developmental applications. They cannot perform acquisition and tracking without several iterations of coding, which does not allow for fast processing. This work provides a Matlab SDR that is based on freely available and optimized components that can be applied to all GNSS signals. A previous basis has been expanded upon to perform tracking of QZSS signals. In addition to this, two separate hardware front ends were compared and their differences analyzed. These hardware systems collected data with different disciplining clocks, but …
Implementation Of High Speed And Low Power Radix-4 8*8 Booth Multiplier In Cmos 32nm Technology, Rishit Navinbhai Patel
Implementation Of High Speed And Low Power Radix-4 8*8 Booth Multiplier In Cmos 32nm Technology, Rishit Navinbhai Patel
Browse all Theses and Dissertations
According to Moore’s law, number of transistors integrated on a single chip double every 18 months with a lot new functionality embedded, which results the increasing of delay and power consumption of a chip. To improve the performance of a more complicated digital circuit design, faster and power efficient digital sub-components are in urgent need. Multipliers are the key components in the field of DSP, GPU and CPU which compute enormous amount of binary data. A radix-4 8*8 booth multiplier is proposed and implemented in this thesis aiming to reduce power delay product. Four stages with different architecture are used …
Improvement Of Continuous Wave Radar Measurements In A Partially Controlled Environment, Jared Smith
Improvement Of Continuous Wave Radar Measurements In A Partially Controlled Environment, Jared Smith
Browse all Theses and Dissertations
A continuous wave (CW) radar system within a partially controlled environment measures scale model aircraft for mono-static and fully polarimetric radar imaging. Due to a pseudo-far-field setup, wavefront curvature manifests primarily as geometric distortion. Recently proposed phase error models show induced geometric distortion to be independent of aperture size which are verified via measurement for Sensors and Signals Exploitation Laboratory (SSEL) collections. The partially controlled nature of the SSEL introduces stray infrastructural reflections into the measured data. Three methods to reduce stray signals are explored namely: true background subtraction (TBS), running average (RA), and spatial filtering (SF). Of the three …
Extended Kalman Filter And Lqr Controller Design For Quadrotor Uavs, Muneeb Masood Raja
Extended Kalman Filter And Lqr Controller Design For Quadrotor Uavs, Muneeb Masood Raja
Browse all Theses and Dissertations
A quadrotor is a unique class of UAVs with vertical take off and landing (VTOL) capability and has attracted significant attention due to its importance in various applications. This thesis presents the design and experimental implementation of Extended Kalman Filters (EKFs) to estimate the states of a quadrotor and a Linear Quadratic Regulator (LQR) controller with integral action to meet the desired control objectives. In case of the Extended Kalman Filters, two different situations are considered: (1) all the states including the Inertial Measurement Unit (IMU) biases are estimated; (2) only the attitude, altitude, and vertical velocity are estimated. The …
An Engage Or Retreat Differential Game With Mobile Agents, Swathi Chandrasekar
An Engage Or Retreat Differential Game With Mobile Agents, Swathi Chandrasekar
Browse all Theses and Dissertations
The thesis is aimed at developing optimal defensive strategies that dissuade an attacker from engaging a defender while simultaneously persuading the attacker to retreat. A two-player Engage or Retreat differential game is developed in which one player represents a mobile attacker and the other player represents a mobile defender. Both players are modeled as massless particles moving with constant velocity. The choice to terminate the game in engagement or retreat lies with the attacker. The defender indirectly influences the choice of the attacker by manipulating the latter's utility function. In other words, the defender co-operates with the attacker so that …
Unmanned Vehicles Formation Control In 3d Space And Cooperative Search, Saba Ramazani
Unmanned Vehicles Formation Control In 3d Space And Cooperative Search, Saba Ramazani
Doctoral Dissertations
The first problem considered in this dissertation is the decentralized non-planar formation control of multiple unmanned vehicles using graph rigidity. The three-dimensional formation control problem consists of n vehicles operating in a plane Q and r vehicles that operate in an upper layer outside of the plane Q. This can be referred to as a layered formation control where the objective is for all vehicles to cooperatively acquire a predefined formation shape using a decentralized control law. The proposed control strategy is based on regulating the inter-vehicle distances and uses backstepping and Lyapunov approaches. Three different models, with increasing …
Curipilot, Gregory Cusack, Karan Daryanani, Nathaniel Tucker
Curipilot, Gregory Cusack, Karan Daryanani, Nathaniel Tucker
Interdisciplinary Design Senior Theses
The drone industry has rapidly grown over the last three years and many large companies have determined that the phenomenon is worth investing in. Recently, Intel has shown interest in this growing industry. Intel developed a next generation processor to be used in drones in addition to investing in the Chinese drone hardware company, Yuneec. Contracted by Intel, the CuriPilot team laid the foundation for linking the hardware and software layers of Intel's drone technology by designing the stabilization control system for the next generation of processors and drones. The CuriPilot team built a foundation for future drone development and …
Bringing Electricity To Alafiarou: The Solar Microgrid Project, Nicolas Metais, Jacob Leatherberry
Bringing Electricity To Alafiarou: The Solar Microgrid Project, Nicolas Metais, Jacob Leatherberry
Electrical and Computer Engineering Senior Theses
Despite the great technological advancements and discoveries that have been made throughout the last century, 1.2 billion people still live without access to electricity, 95% of which live in Sub-Saharan Africa and developing Asia.1 In this paper, we discuss how we designed and implemented a self-sustaining, affordable and highly replicable solar microgrid in order to accelerate the electrification of rural communities in the most environmentally conscious way possible. Our project focused on developing a microgrid for a small community of 10 households in rural Benin that previously had no access to electricity. We travelled to this village in December of …
Pcb Prototyping, Kasey Chun, Dylan Hack, Ilja Medan, Michael Rudolf, Ryan Sidley
Pcb Prototyping, Kasey Chun, Dylan Hack, Ilja Medan, Michael Rudolf, Ryan Sidley
Interdisciplinary Design Senior Theses
In today’s world, Printed Circuit Boards, also known as PCBs, are part of our daily lives. However, it is currently difficult for students in university classes or hobbyists to quickly produce custom made PCBs since no system exists where every step in the production process is on one platform. There are four main steps that go into manufacturing a PCB once it is fully designed which are: milling, solder dispensing, component placement, and a reflow process. The goal will be to create various toolheads and place them onto a single platform allowing the user to perform the aforementioned production processes. …
Marv: Marine Autonomous Research Vessel, Drew Azevedo, Sam Beltram, Gregorio Delvecchio, Ben Hopner
Marv: Marine Autonomous Research Vessel, Drew Azevedo, Sam Beltram, Gregorio Delvecchio, Ben Hopner
Interdisciplinary Design Senior Theses
Conducting hydrologic research in remote areas is currently performed manually, making it a labor intensive and inaccurate solution. Due to the size, weight, and cost of automated solutions on the market today, a need has arisen for a low cost, highly portable, autonomous solution. Working closely with Santa Clara University’s Robotics Systems Lab (RSL), our team has developed a low cost, highly portable autonomous marine research vessel named MARV (Marine Autonomous Research Vessel). It is an autonomous surface platform where scientists outfit the vessel with their own data acquisition equipment. The mechanical chassis is collapsible for modes of remote transportation …