Prestressed Concrete Cylinder Pipe (PCCP) is a widely used water pipe all over the world. A major cause of PCCP failure is the internal wire break, which will emit acoustic signal. In this paper, a hydrophone-based PCCP real-time monitoring and failure-prediction system was proposed. By applying wavelet energy normalization analysis to signal feature extraction and Support Vector Machine (SVM) ...

We simulate the granular flow in a narrow pipe with a lattice–gas automaton model. We find that the density in the system is characterized by two features. One is that spontaneous density waves propagate through the system with well–defined shapes and velocities. The other is that density waves are so distributed to make the power spectra of density fluctuations as 1/fα noise. Three important p...

We describe a system, which we call a Peer-to-peer Information Preservation and Exchange (PIPE) network, for protecting digital data collections from failure. A signi cant challenge in such networks is ensuring that documents are replicated and accessible despite malicious sites which may delete data, refuse to serve data, or serve an altered version of the data. We enumerate the services of PI...

In the air-conditioner’s market, the users are particularly sensitive to the vibration and noise of the machine. Thus, the enterprise not only the air-conditioner manufactures but also the compressor manufactures cast about how to develop and design more quietly machine. In this paper, we analyzed various kinds of factors that influenced the vibration and noise of air-conditioner, and we give t...

A model suited for control tasks is developed for a submerged offshore pipe during the pipelay operation. The pipe is fixed in the touchdown point at the seabed in one end and attached to a pipelay vessel in the other end. The developed model is discrete and is on the form of the robot equation with minimal coordinates. Thus the methods of controller synthesis and stability analysis can be appl...

A distributed Brillouin fiber sensor has been employed to detect localized pipe-wall buckling in an energy pipe by measuring the longitudinal and hoop strain distributions along the outer surface of the pipe for the first time. The locations of the localized pipe-wall buckling are found and distinguished using their corresponding strain-load data. The formation of the buckling process for the c...

Buried water and gas pipe systems form part of critical infrastructure providing essential services to the community. In many global population centres including in Australia, this vital infrastructure has been installed several decades ago, and dealing with frequent pipe failures become a major problem. There are clear evidences that pipe failures significantly depend on pipe strains induced b...

This paper presents our efforts in the updating of the Storm Water (SW) Database using Global Positioning System (GPS), direct survey and measurements of the Storm Water structures (or called Manhole) in GIS database management. The main task assignments include (1) Designing a data structure, which becomes an effective geodatabase structure to represent the storm water structures and the corre...

Genetic algorithms have been used to solve many water distribution system optimization problems, but have generally been limited to steady state or quasi-steady state optimization. However, transient events within pipe system are inevitable and the effect of water hammer should not be overlooked. The purpose of this paper is to optimize the selection, sizing and placement of hydraulic devices i...