비정상 상태의 상수관망 해석을 위한 HSPDA 모형의 개발 = Development of HSPDA Model for Water Distribution System under Abnormal Operating Condition

국문 초록 (Abstract)

용수공급시스템의 수리해석은 절점에서의 용수수요는 항상 만족한다는 전제하에 절점 수두를 계산하는 demand-driven analysis(DDA)와 절점에서의 수두에 따라 용수공급량이 변하는 것을 고려하여 절점에서의 가능 용수공급량과 수두를 동시에 계산하는 pressure-driven analysis(PDA)로 구분된다. 관파괴, 용수수요 증가, 화재 발생 등과 같이 비정상상태의 용수공급시스템의 수리해석을 위해서는 DDA로는 적합한 모의가 불가능하며, PDA에 의한 해석이 필요하다. 그러나 PDA는 용수공급량과 수두를 동시에 계산하므로 계산이 어려운 단점이 있다. 본 연구에서는 기존에 개발된 모형의 단점을 보완한 PDA 모형의 기본 구조를 제안하였으며, 발견적탐색법의 하나인 화음탐색법과 수리해석모형인 EPANET을 이용한 HSPDA 모형을 개발하였다. 개발된 모형을 단순관망에 적용하여 개발된 모형의 PDA개념 구현여부를 검토하였다. 회로형관망에 개발된 모형을 적용하여 관파괴상황과 화재발생상황에 대한 기존모형의 결과와 비교하였다. 개발된 모형은 비정상상태인 상수관망의 수리모의를 위해 개발된 기존의 PDA모형이 가지고 있는 단점을 적절히 보완한 모형으로 판단된다.

다국어 초록 (Multilingual Abstract)

Solving hydraulic conditions in a water distribution system, two approaches are widely used, namely, demand-driven analysis (DDA) and pressure-driven analysis (PDA). In DDA, it is assumed that nodal demand is always satisfied regardless of pressure head at nodes and the unknown nodal heads are determined under this assumption. In PDA, it is assumed that nodal demand is fully satisfied only if the minimum required pressure head at that node(nodal head) is satisfied. If not, nodal demand is partially satisfied and is dependant on nodal head. For this reason, to simulate the hydraulic condition under PDA, the unknown nodal demand and the unknown nodal head are simultaneously solved and it is very difficult to solve. In general, DDA work well under normal operating conditions. However, it may generate unrealistic results to simulate hydraulic conditions under abnormal operating conditions such as pipe failure, temporal increase in demand and a fire event. In this study, the conceptual structure of a PDA model named HSPDA model is suggested. It consists of the Harmony Search which is one of the heuristic optimization algorithms and an hydraulic simulator, EPANET. Developed model is applied to simple water network to investigate whether the new model embodies the concept of PDA. The suggested model is applied to virtual water distribution systems under two abnormal conditions such as a pipe failure and fire demand to show its applicability. Moreover, the results of existing hydraulic simulation models and the suggested model are compared. As results, the developed PDA shows that it can simulate abnormal conditions efficiently.

목차 (Table of Contents)

• Abstract
• 요지
• 1. 서론
• 2. Pressure-Driven Analysis
• 3. 모형의 기본 알고리즘
• 4. 모형의 적용 : Simple Network
• 5. 모형의 적용 : Looped Network
• 6. 결론
• 감사의 글
• 참고문헌

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