2026-09-21T21:41:14Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/20348 2023-07-10 col_2142_5131 col_2142_14770 com_2142_5130 com_2142_3518 com_2142_234

http://hdl.handle.net/2142/20348 eng Copyright 1990 Park, Heekyung Liebman, Jon C. Park, Heekyung 2011-05-07T12:36:40Z 2011-05-07T12:36:40Z 10000-01-01 1990 Redundancy of looped water distribution networks is quantified with expected shortage, a reliability surrogate which can represent frequency, duration and severity of damages caused by failures of components. Based on this surrogate and its variations (total expected shortage and allowable shortage fraction), two optimization models that lead to the determination of minimum cost pipe diameters to provide specific levels of reliability are developed: the expected shortage optimization model (ESOM), and the allowable shortage fraction optimization model (ASFOM). Studied are comprehensively two aspects of these basic models: computational time and flexibility to satisfy sophisticated design conditions. Because the two basic models are too large to be of practical use in most cases, a modification (CBCM) that heuristically omits many constraints is constructed and its behavior explored. Minor variations of these models are also developed to demonstrate the flexibility which is inherent in the basic structure. This flexibility permits the satisfaction of special real-world design conditions that result in specific reliability requirements at particular nodes. Another variation (OMET) is capable of sizing a storage facility in addition to determining optimal pipe diameters. These models have successfully been applied to the optimization of example networks. The application results noted that a reliability surrogate of expected shortage is very useful in optimizing networks with constrained redundancy and applicational limitations of the models to practical problems in terms of computational time and flexibilities are avoidable. Especially, the results show that the models have the power to undertake direct exploration of tradeoffs between cost and reliability. Made available in DSpace on 2011-05-07T12:36:40Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026292.pdf: 5165632 bytes, checksum: d4ecbef6d301d41b474b8bd2a8a27caf (MD5) Previous issue date: 1990 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:43:17Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:18:55-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9026292 (UMI)AAI9026292 Engineering, Civil Engineering, Sanitary and Municipal Environmental Sciences Redundancy-constrained minimum-cost design of water distribution networks text Civil and Environmental Engineering Civil Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.