The Trend Surface Analysis Study Of Network Pressure In The Management And Schedule Of Water Supply System

Water supply of city is its vital arteries and offers necessary condition for producing and living. It is the key factor of city development and also the important factor of society stableness. Because water is not replaced, selected and connects with all the residenters of city, water supply of city is the principal utility of the city. As the carrier and implement of water supply management water supply enterprises takes on the important task of managing the lifeline of people's living. Its management level affects directly the development of economy and society. Thus high quality, enough quantity, sufficient pressure, safety , reliable and energy conservation that were the highest aim for water supply enterprises management.In rencent years, the research of management and schedule system of water supply enterprise already get into actual operational stage. but the key point of network pressure model methods stilldependent limited several pressure supervisor, even through its optimal distribute that may solve the represent character problem of pressure, but network pressure that produce in this way was discrete, then can't present the distribute character of whole network pressure, also can't satisfy the require of network optimal schedule .The paper through analysis the character of network pressure, rely on the pressure date of several pressure supervisor, combine with character of network, use traditional equal difference theory, to do authenticity check for other nodes pressure except pressure supervisor, then realize the thinking of through limites pressure dates of pressure supervisor to make totally comprehend for whole nodes of network .use trend surface analysis theory, to do trend surface simulate for pressure dates that after revised, actually realise the continue simulate for network pressure , then provide the important foundation for network optimal management and schedule. At last in one practise project use this method to validate its validity.The main conclusion of this research were:(1) For the distribute character of network pressure has definite trend character, according with the trend surface analysis theory, use the trend surface analysis method to do network pressure model was reliable;(2) The trend surface of network presure comprises two parts as trend and difference. Trend represent the general rule of networkpressure, that was the most significance part in the schedule; but difference reflected the fluctuate of node or pipe pressure that affected by many factors that can't be forecast.(3) Through the way that use pressure supervisor to make authenticity proofread for othe nodes pressure, realize the method that under the condition of not added more pressure supervisor to find out real time character of whole network pressure, then largely saved the cost of autocontrol projects.(4) The model result of pressure date trend surface, indeed realized continue simulate of network pressure.(5) Through actual example analysis make sure that the research result can use into the actually management and schedule systems, and better in function.In the example of this research, that only maked the analysis of two times trend surface that was through concerd in this example where the landform condition and network systems were relatively simple. While systems were complex may consider use more higher times trend surface to do analysis, that will increase the simulate degree.