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Articles 1 - 6 of 6
Full-Text Articles in Engineering
Practical Solutions To The Non-Minimum Phase And Vibration Problems Under The Disturbance Rejection Paradigm, Shen Zhao
ETD Archive
This dissertation tackles two kinds of control problems under the disturbance rejection paradigm (DRP): 1) the general problem of non-minimum phase (NMP) systems, such as systems with right half plane (RHP) zeros and those with time delay 2) the specific problem of vibration, a prevailing problem facing practicing engineers in the real world of industrial control. It is shown that the DRP brings to the table a refreshingly novel way of thinking in tackling the persistently challenging problems in control. In particular, the problem of NMP has confounded researchers for decades in trying to find a satisfactory solution that is …
An Active Disturbance Rejection Control Solution For Electro-Hydraulic Servo Systems, Xiao Wang
An Active Disturbance Rejection Control Solution For Electro-Hydraulic Servo Systems, Xiao Wang
ETD Archive
The intriguing history of disturbance cancellation control is reviewed in this thesis first, which demonstrates that this unique control concept is both reasonable and practical. One novel form of disturbance cancellation, ADRC (Active Disturbance Rejection Control), attracts much attention because of its good disturbance rejection ability and simplicity in implementation. Hydraulic systems tend to have many disturbances and model uncertainties, giving us a great motivation to find out a good control method. In this thesis, electro-hydraulic servo control problem is reformulated to focus on the core problem of disturbance rejection. An ADRC solution is developed and evaluated against the industry …
Distributed Biogeography Based Optimization For Mobile Robots, Arpit Shah
Distributed Biogeography Based Optimization For Mobile Robots, Arpit Shah
ETD Archive
I present hardware testing of an evolutionary algorithm (EA) known as distributed biogeography based optimization (DBBO). DBBO is an extended version of biogeography based optimization (BBO). Typically, EAs require a central computer to control the evaluation of candidate solutions to some optimization problem, and to control the sharing of information between those candidate solutions. DBBO, however, does not require a centralized unit to control individuals. Individuals independently run the EA and find a solution to a given optimization problem. Both BBO and DBBO are based on the theory of biogeography, which describes how organisms are distributed geographically in nature. I …
An Analysis Of Data Quality Defects In Podcasting Systems, Thomas A. Mis
An Analysis Of Data Quality Defects In Podcasting Systems, Thomas A. Mis
ETD Archive
Podcasting has emerged as an asynchronous delay-tolerant method for the distribution of multimedia files through a network. Although podcasting has become a popular Internet application, users encounter frequent information quality problems in podcasting systems. To better understand the severity of these quality problems, we have applied the Total Data Quality Management methodology to podcasting. Through the application of this methodology we have quantified the data quality problems inherent within podcasting metadata, and performed an analysis that maps specific metadata defects to failures in popular commercial podcasting platforms. Furthermore, we extracted the Really Simple Syndication (RSS) feeds from the iTunes catalog …
Synchrophasors' Application In Svc For Industrial Networks, Kareem M. Suhwail
Synchrophasors' Application In Svc For Industrial Networks, Kareem M. Suhwail
ETD Archive
It is widely understood that as fuel and energy prices continue to increase, new and innovative ways of becoming more energy efficient will be required. This couldn't be more apparent than in industry, where every decision is constrained by economics. Power factor correction is a cost effective way for industry to have economically sound improvements with maximum efficiency benefits. It is proposed that in large industrial systems, where an SVC (Static Var Control) system could be used, synchrophasor measurements could also be used to control the SVC and provide enhanced historical analysis. Currently, many protective relays used in industry provided …
A Coding Enabled Anonymity Network, Saikrishna Gumudavally
A Coding Enabled Anonymity Network, Saikrishna Gumudavally
ETD Archive
An onion routing based anonymous communication system is developed to address timing analysis attacks, a common limitation of many contemporary anonymous systems including Tor. Timing analysis based attacks gained importance because simple payload check and packet inspection attacks are avoided by encrypting packets. Timing information gathered at one part of the network is correlated with information gathered at other parts to break the anonymity. Network coding, a recently developed packet forwarding technique, is used to disrupt timing attacks. The system uses a multicast tree of onion routers (OR) through which the packets are relayed to desired destinations. Packets from different …