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- Type:
- Article
- Description/Abstract:
- A general methodology has been developed for the design of a robust control law for a family of lightly damped second order problems. In this research effort, the passivity approach has been extended to systems having non-collocated input/output pairs by introducing an observer that incorporates the nominal dynamical model of the plant. The developed passive observer-based control law emulates numerous dynamic vibration absorbers which are tuned to a targeted frequency using classical methods and the tuning ratios are time-invariant. However, the uniqueness of this approach is that the damping parameters of the emulated absorbers are continuously varied by means of a fuzzy logic control algorithm to provide near minimum-time suppression of vibration. The developed approach is applied to both several benchmarks in the field of structural dynamics as well as experiments using piezo-ceramic sensors and actuators. Results show that this methodology provides stability and performance robustness on the one hand as well as requiring relatively low amount of actuation authority for desired nominal plant closeloop behavior.
- Creator/Author:
- Weller, Tanchum; Cohen, Kelly, and Ben-Asher, Joseph
- Submitter:
- Kelly Cohen
- Date Uploaded:
- 02/03/2017
- Date Modified:
- 04/05/2017
- Date Created:
- 2001-11
- License:
- All rights reserved
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- Type:
- Article
- Description/Abstract:
- Unmanned Air Vehicle (UAV) teams are anticipated to provide surveillance support through algorithms, software, and automation. It is desirable to have algorithms that compute effective and efficient routes for multiple UAVs across a variety of missions. These algorithms must be realizable, practical, and account for uncertainties. In surveillance missions, UAVs act as mobile wireless communication nodes in a larger, underlying network consisting of targets where information is to be collected and base stations where information is to be delivered. The role of UAVs in these networks has primarily been to maintain or improve connectivity while undervaluing routing efficiency. Moreover, many current routing strategies for UAVs ignore communication constraints even though neglecting communication can lead to suboptimal tour designs. Generating algorithms for autonomous vehicles that work effectively despite these communication restrictions is key for the future of UAV surveillance missions. A solution is offered here based on a variation of the traditional vehicle routing problem and a simple communication model. In this work, the new routing formulation is defined, analyzed, and a heuristic approach is motivated and described. Simulation results show that the heuristic algorithm gives near-optimal results in real-time, allowing it to be used for large problem sizes and extended to dynamic scenarios.
- Creator/Author:
- Cohen, Kelly; Sabo, Chelsea, and Kingston, Derek
- Submitter:
- Kelly Cohen
- Date Uploaded:
- 02/03/2017
- Date Modified:
- 04/05/2017
- Date Created:
- 2014-01
- License:
- All rights reserved
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- Type:
- Article
- Description/Abstract:
- The problem of assigning a group of Unmanned Aerial Vehicles (UAVs) to perform spatially distributed tasks often requires that the tasks will be performed as quickly as possible. This problem can be defined as the Min–Max Multiple Depots Vehicle Routing Problem (MMMDVRP), which is a benchmark combinatorial optimization problem. In this problem, UAVs are assigned to service tasks so that each task is serviced once and the goal is to minimize the longest tour performed by any UAV in its motion from its initial location (depot) to the tasks and back to the depot. This problem arises in many time-critical applications, e.g. mobile targets assigned to UAVs in a military context, wildfire fighting, and disaster relief efforts in civilian applications. In this work, we formulate the problem using Mixed Integer Linear Programming (MILP) and Binary Programming and show the scalability limitation of these formulations. To improve scalability, we propose a hierarchical market-based solution (MBS). Simulation results demonstrate the ability of the MBS to solve large scale problems and obtain better costs compared with other known heuristic solution.
- Creator/Author:
- Sharma, Balaji R.; Cohen, Kelly; Ernest, Nicholas; Kumar, Manish, and Kivelevitch, Elad
- Submitter:
- Kelly Cohen
- Date Uploaded:
- 02/03/2017
- Date Modified:
- 04/05/2017
- Date Created:
- 2014-01
- License:
- All rights reserved
-
- Type:
- Article
- Description/Abstract:
- This use case appears in Curating Research Data V2, an ACRL publication edited by Lisa R Johnston. Both volumes of the book are available as open access editions at the following link. http://www.ala.org/acrl/publications/booksanddigitalresources/booksmonographs/catalog/publications The use case examines the metadata contributed in a self-submission repository model and what changes were made in the metadata form to encourage researchers to contribute quality metadata.
- Creator/Author:
- Koshoffer, Amy; Hansen, Carolyn, and Newman, Linda
- Submitter:
- Amy Koshoffer
- Date Uploaded:
- 01/30/2017
- Date Modified:
- 02/21/2017
- Date Created:
- 2016-02-12
- License:
- Attribution-NonCommercial-NoDerivs 4.0 International
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- Type:
- Media
- Description/Abstract:
- What initially looked like several change agents colliding to create a year of turbulence, came to be a year of transformation for our teaching practice. Both external forces, such as ACRL’s Framework for Information Literacy for Higher Education, and internal forces, such as new strategic directions in eLearning, provided momentum as we redesigned our research guides. The presentation includes a case study of a year-long process of re-envisioning our guides to enhance content based on the Framework’s threshold concepts, incorporate responsive and accessible design, and reflect our pedagogical practices. Throughout the process we collaborated with key campus stakeholders: eLearning strategists, English Composition faculty, and the student population. In addition, our process coincided with the renovation of one of our classrooms into a collaborative teaching and learning environment. The presentation demonstrates how the new space converged with our instruction strategies.
- Creator/Author:
- Hart, Olga and Bach, Pamela
- Submitter:
- Olga Hart
- Date Uploaded:
- 01/26/2017
- Date Modified:
- 01/26/2017
- License:
- Attribution-NonCommercial-NoDerivs 4.0 International
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- Type:
- Document
- Description/Abstract:
- This is the iBook version of chapter five of five. It requires the iBooks app to read. The media is embedded so no internet connection is necessary after the book has been downloaded. It contains many interactive widgets and videos that are not found in the epub, pdf, and mobi versions. However, the file size for this format is much larger and requires the book to be broken into individual chapters. All the text can be read by clicking the Closed Caption (CC) button on each video. There are keywords on the right side of each page to enable word searches.
- Creator/Author:
- Petach, Jay
- Submitter:
- Jay Petach
- Date Uploaded:
- 01/11/2017
- Date Modified:
- 01/11/2017
- License:
- All rights reserved
-
- Type:
- Document
- Description/Abstract:
- This free eBook can be read on Kindles. The book contains links to 400 videos that are hosted on YouTube. In order to view the videos you must have an intern connection. Simply click the large blue underlined text links, which are the links to the videos. That video will then open on YouTube. When you want to return to the book, close the YouTube window. Most of the text in the book is also found in the videos, so you don't have to do much actual reading (unless you want to read the text). The book is a very small file, so it can be viewed on mobile devices with WIFI connectivity. However, the book will run a bit faster on a laptop or desktop with internet connection. The five chapters of the book include... 1 The Physics and Physiology of Sound 2 The History of Sound Recording 3 Analog Recording, Microphones, and Consoles 4 Digital Recording and Signal Processing 5 Music
- Creator/Author:
- Petach, Jay
- Submitter:
- Jay Petach
- Date Uploaded:
- 01/11/2017
- Date Modified:
- 08/16/2017
- License:
- All rights reserved
-
- Type:
- Document
- Description/Abstract:
- This free eBook can be read on both Macs and PCs that have an epub reader app. iBooks Reader works well on Macs. Kindle Reader will work on either Macs or PCs. The book contains links to 400 videos that are hosted on YouTube. In order to view the videos you must have an intern connection. Simply click the large blue underlined text links, which are the links to the videos. That video will then open on YouTube. When you want to return to the book, close the YouTube window. Most of the text in the book is also found in the videos, so you don't have to do much actual reading (unless you want to read the text). The book is a very small file, so it can be viewed on mobile devices with WIFI connectivity. However, the book will run a bit faster on a laptop or desktop with internet connection. The five chapters of the book include... 1 The Physics and Physiology of Sound 2 The History of Sound Recording 3 Analog Recording, Microphones, and Consoles 4 Digital Recording and Signal Processing 5 Music
- Creator/Author:
- Petach, Jay
- Submitter:
- Jay Petach
- Date Uploaded:
- 01/11/2017
- Date Modified:
- 08/16/2017
- License:
- All rights reserved
-
- Type:
- Document
- Description/Abstract:
- This free eBook has 400 videos embedded in the book that can be viewed without internet connection. Most of the text in the book is also in the videos, so you don't need to actually read the text, unless you want to. This is a textbook for students and lovers of audio. The five chapters include... 1 The Physics and Physiology of Sound 2 The History of Sound recording 3 Analog Recording, Microphones, and Consoles 4 Digital Recording and Signal Processing 5 Music Because the videos are embedded, the file is quite large 1.3 GB, so make sure that you have enough storage on whatever device you're using. If storage is an issue, you might want to download one of the versions that do not have embedded media, but instead have links to the videos on the internet. Those versions are under 5 MB.
- Creator/Author:
- Petach, Jay
- Submitter:
- Jay Petach
- Date Uploaded:
- 01/11/2017
- Date Modified:
- 08/16/2017
- License:
- All rights reserved
-
- Type:
- Document
- Description/Abstract:
- This free eBook is viewable with Adobe Acrobat Reader and other apps that will read pdfs. This five-chapter book contains links to videos hosted on YouTube. Most of the text in the book is the text from the videos. The large blue text with underlines are the links to the videos. Click these links to see the video and then close the YouTube window to return to the book. In order to view the videos you must have a connection to the internet. This book will work on mobile devices with WIFI, but will work faster on desktops and laptops that have an internet connection. The five chapters include... 1 The Physics and Physiology of Sound 2 The History of Sound recording 3 Analog Recording, Microphones, and Consoles 4 Digital Recording and Signal Processing 5 Music
- Creator/Author:
- Petach, Jay
- Submitter:
- Jay Petach
- Date Uploaded:
- 01/10/2017
- Date Modified:
- 08/17/2017
- License:
- All rights reserved