Measurements of Remote Micro Displacements of the Piping System and a Real Time Diagnosis on Their Working States Using a PIV and a Neural Network

Abstract

>> Piping systems play an important role in gas and oil transferring system. In the piping system, there are many elements, such as valves and flow meters. In order to check their normal operating conditions, each signal from each element is displayed on the monitor in the pipe control room. By the way, there are several accidental cases in the piping system even if all signals from the local elements are judged to be normal on the monitor in the control room. Further, opposite cases often happen even the monitor shows abnormal while the local elements work normal. To overcome this abnormal functions, it is not so easy to construct the environment in which sensors detecting the working states of all elements installed in the piping system. In this paper, a new non-contact measurement technique which can calculate the elements' delicate displacements by using a PIV(particle image velocimetry) and diagnose their working states by using a neural network is proposed. The measurement system consists of a host computer, a micro system, a telescope and a high-resolution camera. As a preliminary test, the constructed measurement system was applied to measure delicate vibrations of mobile phones. For practical application, a pneumatic system was measured by the constructed system.

Gas Absorption and Release Properties of Zn(BH4)2 and MgH2-Zn(BH4)2-Ni-Ti-Fe Alloy

“…We designate this sample as Zn(BH 4 ) 2 (+NaCl) since it contained a large amount of NaCl. The XRD pattern of the sample is very similar to those of the samples prepared by Jeon and Cho under similar conditions 22,23). An analysis of the phases in the prepared sample indicates that milling ZnCl 2 and NaBH 4…”

“…An endothermic peak is observed at 87.9 o C in the DTA curve of this sample. Comparing the DTA result with that reported in Refs., 20,22,23) the phase that decomposes at 87.9 o C is that of Zn(BH 4 ) 2 . The other peaks are considered to have resulted from the materials formed through oxidation or adsorption of water vapor during the treatment of Zn(BH 4 ) 2 .…”

“…In addition, Zn(BH 4 ) 2 can be easily synthesized by reacting ZnCl 2 and NaBH 4 in a solvent 21) or by milling. 22,23) According to Nakagawa et al, 20) Zn (BH 4 ) 2 is formed by milling ZnCl 2 and NaBH 4 , which is expressed as follows:…”

Non-contact monitoring of 3-dimensional vibrations of bodies using a neural network

“…Pneumatic and hydraulic piping lines control machinery such as the engines for ship propulsion and the engines for This study is restricted to two-dimensional measurements of the vibrations of the plate. Jeon et al [2][5] proposed a new measurement technique in which one high-speed camera was used and its time consecutive images were used to detect the displacement of measurement bodies. These results were also restricted to two-dimensional vibrations.…”

Evaluation on performances of a real-time microscopic and telescopic monitoring system for diagnoses of vibratory bodies

“…Unfortunately, serious accidents occur due to malfunctions of electrical or electronic sensor systems installed at the plants [1]. This implies that there is no way to monitor the malfunctions of the piping and machinery system when the sensors installed at those systems were electrically or electronically out of order.…”