A Monitoring System of Marine Construction Vessels under Tow

Abstract

The marine construction by the Cement Deep Mixing method (CDM method) is widely done to the improvement of the soft subsoil in the breakwater construction work etc. The number of marine construction vessels corresponding to the CMD method is little, and the vessels are towed to the tugboat and are bringing all over the country. However, the accident such as floods is not detected easily because the vessel becomes uninhabited when bringing, and there is a possibility of causing a serious accident. In this paper we developed the monitoring system of marine construction vessels under tow. In the monitoring system, the presence of the position, the roll angle, and the flood is in real-time monitored, the information is recorded in the database, and the report is delivered by using E-mail. The monitoring system is introduced into the marine construction vessels, and has already put it to practical use. And analyzing the time series of roll angle recorded in database, we confirmed to be able to detect the change in the pay state of the marine construction vessel by the Fourier transform of the roll angle, and analyzing it as a spectrum of the roll frequency.