Mauricio Iwanaga

São Paulo State University | Unesp · Department of Mechanical Engineering

Inspection and preservation of buried water pipelines is of importance in the modern world. The wastage of water due to leaks is a global problem and existing technologies/methods to detect leaks in buried pipelines still face challenges, such as how to predict the bandwidth of measured leak noise using acoustic correlators, and what are the main f...

Buried pipes are used worldwide to transport water. Although they are convenient, a large amount of water is wasted during the transportation. To minimize such a problem, water companies apply different technologies to locate leaks in their pipe networks, where the buried pipe is usually located first. Electromagnetic techniques can be used to loca...

Inspection and preservation of buried water pipelines is of importance in the modern world. The wastage of water due to leaks is a global problem and existing technologies/methods to detect leaks in buried pipelines still face challenges, such as how to predict the bandwidth of measured leak noise using acoustic correlators, and what are the main f...

Acoustic correlators are often used to pinpoint leaks in water distribution systems. Generally, these devices are tested for their efficacy in bespoke test rigs that are also used for training purposes. However, this can be problematic as it is difficult to expose the correlators to identical conditions, and only a limited number of situations is p...

A common way to pinpoint a leak in a buried plastic water pipe is to use a leak noise correlator. This isperformed by using the time delay between two measured signals and the velocity at which such signalstravel along the pipe. In this paper, an investigation is carried out into the use of a geophone in reverse,driven by an oscillating voltage. It...

Impulse response functions (IRFs) and frequency response functions (FRFs) are fundamental quantities that describe the dynamic behaviour of a linear vibrating system in the time and frequency domains respectively. The acceleration IRF is of particular concern in this paper, because unlike the displacement and velocity IRFs it contains a Delta funct...