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The reliable operation of motor drive systems has been paid more and more attention, which is regarded as the key factor for various applications. In this paper, under the concept of the reliability prediction metrics and models from component-level to system-level, quantitative reliability assessment of motor drive system can be introduced from four aspects: subsystems of power converter, subsystems...
In this paper, a three-phase 12/8 switched reluctance generator is taken as the study object and a control system based on that generator is designed. In that system, the digital signal controller applied for is dsPIC30F6010, and power converter circuit adopt asymmetric half-bridge topology, and the main switches use power MOSFET. The paper analyzes the process of power generation and the basic structure...
The electric drive system is one of the most important parts of electric vehicles (EVs), whose function is the conversion between electric energy and mechanical energy. Switched reluctance motor (SRM) has the features of simple construction, high starting torque, wide speed range, high efficiency and high reliability which are appropriate for EVs drive system. Firstly, instantaneous torque control...
This paper presents a power balance control (PBC) scheme for switched reluctance generator (SRG) wind power system integrated with DC microgrid. First, a switched reluctance generator wind power system is, which acts as distributed energy source, is integrated with a 24V utility DC microgrid. With proper convertor design and control characteristic for SRG system, output voltage ripple is minimized,...
An optical CMOS heart rate sensor that processes the photoplethysmographic signal was designed and fabricated in Austriamicrosystems 0.35μm CMOS process. The sensor consists of photodiode, transimpedance amplifier, analogue bandpass filters, analogue-to-digital converters, digital signal processor, and a timing circuit that is used to modulate the external light-emitting diodes. The mixed-signal simulation...
With the rapid development of various renewable energy sources, a sustainable power system planning scheme is required throughout the world. For a power grid with large-scale wind power integration, it becomes critical to achieve a better performance to supply electricity in disaster circumstances, such as ice-snow. This paper proposes an anti-disaster transmission expansion planning model, and introduces...
The prototypical brain-computer interface (BCI) algorithm translates brain activity into changes in the states of a computer program, for typing or cursor movement. Most approaches use neural decoding which learns how the user has encoded their intent in their noisy neural signals. Recent adaptive decoders for cursor movement improved BCI performance by modeling the user as a feedback controller;...
Miscellaneous electric loads (MELs) represent a large portion of the electricity consumption. Economic and environmental impacts of energy consumption lead to needs and opportunities in energy management and saving. This paper proposes an intelligent classification and identification of MELs by extending the Self-Organizing Map (SOM) framework to a supervised manner. The SOM can classify a large amount...
Visualization experiments were conducted in a positive pressure system to investigate the starting process characteristics of the absorber sphere pneumatic conveying. The ambient air was used as the source gas. The absorber sphere was replaced by the glass sphere. Spouted spheres flow was observed at the early stage of the starting process. With the increase of feeder inlet gas flow rate with time...
NAND flash memory is widely used in digital cameras, USB devices, cell phones, camcorders and solid-state drives. Continuous lowering of bit cost, increasing flash-memory-die densities and improving performance have helped to expand flash markets. Recently, there are two different directions to meet market demands. One is lowering bit cost and increase memory density to the utmost limit, which is...
A novel coplanar-waveguide (CPW)-fed printed monopole antenna is presented. The proposed antenna consists of four L-shaped monopoles of different sizes and a CPW-fed structure with the total size of 29mm × 25mm × 1mm. The simulated results show that the antenna has good impedance bandwidth at 2.4/5.2/5.8 GHz (2387–2576 MHz, 4887–5384 MHz, 5691–6265 MHz) which easily meet the requirements of the IEEE...
Cognitive Radios and Networks have become a focus of attention commercially and within DoD. Technologies such as Dynamic Spectrum Access (DSA) can greatly improve spectrum utilization and can even address issues such as Anti-Jam. One of the most difficult tasks ahead of us is to manage these cognitive systems. Rules or "policies" must be used to control them, but these policies must be balanced...
For the first time, we demonstrate control of organic thinfilm transistor's (OTFT) threshold voltage (VT) by modifying the gate work function. We present a near-room-temperature, fully lithographic process to fabricate integrated pentacene dual VT OTFTs suitable for large-area and flexible mixed signal circuits. Platinum and aluminum are used as the gate metals for the high VT (more depletion-like)...
This paper presents global lumped-element circuit models of spiral inductor and differential inductor respectively considering quality factor dependence on temperature. Metal resistance components in equivalent circuits of spiral inductor and differential inductor were adopted to reflect quality factor dependence on temperature in global model. And the global models were shown to give excellent agreement...
Health and usage monitoring systems (HUMS) are currently used in military and civil service helicopters for health monitoring of flight critical components. Typically, vibration data recorded during a flight is processed to generate condition indicators (CIs). CIs from healthy components are normally used to set thresholds such that there is a small probability of the CIs of nominal components exceeding...
Vibration based health and usage monitoring systems (HUMS) are providing good information as to the current state of a component, (e.g. health), but other than simple trending, are not robust enough to yield an estimated of the remaining useful life (RUL). There are three fundamental problems that need to be address to accurately estimate RUL. First, health index data is noisy. Even with filtering,...
Wyner-Ziv coding has recently emerged as an alternative to conventional DPCM coding for compression of sources with memory, particularly in video compression. This paper studies the operational rate-distortion performance of Wyner-Ziv coding, using uniform scalar quantization followed by perfect Slepian-Wolf coding, for compression of a Laplace-Markov source. The performance gap of this technique...
Usage monitoring entails determining the actual usage of a component on the aircraft and requires accurate recognition of regimes. In this paper, a data mining approach is adopted for regime recognition. In particular, a regime recognition algorithm developed based on hidden Markov models is presented. The developed algorithm was validated using the flight card data of an Army UH-60L helicopter. The...
This paper addresses key issues in design and implementation of Ka/Ku dual-band SATCOM on-the-move (SOTM) antennas for military applications. Space segment resources include (i) military Ka band with flexibility to extend into commercial Ka band and (ii) commercial Ku band. One example application is mounted battle command on the move (MBCOTM). Selection of SOTM antenna size should be based on performance,...
There is currently no all-encompassing RF analysis tool on the market that allows for complete end-to-end military and commercial RF communications system analysis and simulation. While myriad tools exist to provide specific functional analysis within this scope, there is no tool to pull all of these functions together, while providing additional functions and algorithmic control over everything in...
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