JP2008044472A - Billow impact avoidance system for vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a billow impact avoidance system for a vessel capable of forecasting a bow relative water position after a predetermined time is passed by measuring the bow relative water position of the vessel by a simple measurement means at every moment while aiming at that the relative water position at the bow is successively varied between a wavecrest and a wave trough of the billow reaching to the bow part of the vessel during navigation, and automatically performing operation of the vessel for avoiding the billow impact with a large scale based on the forecasting information. <P>SOLUTION: The billow impact avoidance system for the vessel is provided with a bow relative water position forecasting means for forecasting the relative water level at the bow part after a predetermined time is passed as a forecasting time series wave form 3b based on the time series wave form 3a of the bow relative water level to the present time measured by the bow relative water level measurement means; and a filter as a billow impact load forecasting means for setting a non-sensitive area 3c relative to the forecasting time series wave form 3b obtained by the same forecasting means in an in-vessel computer. The system is provided with a controller for performing automatic control of a propulsion unit and a rudder based on a signal via the filter. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a marine wave impact avoidance system capable of avoiding a navigating ship from being impacted by waves arriving at the bow.

As a system for predicting dangerous individual waves that a ship may encounter while navigating and supporting safety assurance, after obtaining wave information at the current time from the shadow information of the radar image, the wave phase is corrected and a predetermined time later In order to obtain wave information, based on the position and direction of a ship after a predetermined time and the above wave information, an encounter with a dangerous individual wave can be predicted by a danger judgment means and an alarm can be issued. Yes.
However, such an individual wave prediction / warning system has a problem in that a wave is always measured by a radar device for waves in front of the bow, so that a large-scale measuring means is required and the cost is greatly increased.
JP 2004-338580 A

  The present invention pays attention to the fact that the relative water level at the bow sequentially changes between the wave crest and wave bottom of the wave arriving at the bow of the vessel being navigated, and simplified the bow relative water level of the vessel navigating in the wave. By measuring every moment with a simple measuring means, it is possible to predict the bow relative water level after a lapse of a predetermined time, and based on the prediction information, automatic maneuvering to avoid large-scale wave impact that the ship should receive It is an object of the present invention to provide a marine wave impact avoidance system that can be carried out automatically.

  The marine wave impact avoidance system according to the present invention includes a bow relative water level measuring means for measuring the relative water level at the bow of a ship navigating in the waves every moment, and a current measured by the bow relative water level measuring means. A bow relative water level prediction means for predicting the relative water level in the bow after a predetermined time based on the time series waveform of the bow relative water level, and the bow relative water level predicted by the bow relative water level prediction means. On the basis of this, an automatic marine vessel maneuvering means capable of automatically and sequentially transmitting marine vessel maneuvering commands relating to the setting of the boat speed and the steering in order to avoid the wave impact to be received by the ship is provided.

  Further, in the marine wave impact avoidance system of the present invention, the wave impact load predicting means for predicting the wave impact load based on the bow relative water level predicted by the bow relative water level predicting means reaches the automatic ship maneuvering means. It is characterized by being inserted as a filter in the signal path.

  In the marine wave impact avoidance system of the present invention, the bow relative water level of a vessel navigating in the waves is measured every moment by the bow relative water level measuring means, which is significantly less expensive than the wave measuring means, and the bow relative water level up to the present time is measured. Based on these time series waveforms, the bow relative water level after the elapse of a predetermined time is sequentially predicted by the prediction means. Based on the predicted relative water level after the lapse of a predetermined time in this way, the ship maneuvering commands relating to the setting of the ship speed and the steering are automatically automatically performed by the automatic ship maneuvering means so that the large-scale wave impact that the ship should receive can be avoided. Therefore, the safety of ships navigating in the waves is sufficiently maintained even at night when it is difficult to recognize the waves.

  A filter as a wave impact load predicting means is provided in a signal path from the bow relative water level predicting means to the automatic ship maneuvering means so that a dead zone can be set for the bow relative water level predicted by the bow relative water level predicting means. If this is the case, ignore the small waves, for example, foreseeing the water to be injected into the deck and the bottom slamming that should occur several waves ahead, and automatically impact the load on the ship by appropriate maneuvering such as deceleration and turning Can be reduced.

FIG. 1 is an explanatory diagram showing the concept of a marine wave impact avoidance system as an embodiment of the present invention, and FIG. 2 is a conceptual diagram showing a measured value and a predicted value of a bow relative water level.
As shown in FIG. 1, the bow 1a of the ship 1 has a bow relative water level measurement, such as an ultrasonic water level gauge for measuring the relative water level at the bow (a bow relative water level) every moment during navigation in the waves. Means 2 are provided.

  Then, based on the time series waveform 3a (see FIG. 2) of the bow relative water level measured up to the present time by the bow relative water level measuring means 2, the relative water level in the bow until a predetermined time has passed is predicted time series waveform 3b. (Refer to FIG. 2) a bow relative water level prediction means 4 for prediction, and a filter (wave impact load prediction means) 5 for setting a dead zone 3c for the prediction time series waveform 3b obtained by the prediction means 4; Is provided in the inboard computer P, and a controller (automatic ship maneuvering means) 6 for automatically controlling the propulsion device (variable pitch propeller) and the rudder based on a signal passing through the filter 5 is provided.

  In the marine wave impact avoidance system of the above-described embodiment, the bow relative water level of the ship 1 navigating in the waves is measured from moment to moment by the bow relative water level measuring means 2 which is significantly cheaper than the wave measuring means. Based on the time series waveform of the bow relative water level, the bow relative water level after a predetermined time elapses is sequentially predicted by the bow relative water level prediction means 4 as a predicted time series waveform 3b.

  On the basis of the bow relative water level after a predetermined time predicted in this way, the controller 6 serving as an automatic ship maneuvering means is used to set the ship speed and steer the ship so as to avoid a large-scale wave impact to be received by the ship 1. Since the commands are automatically transmitted in sequence, the safety of the ship navigating in the waves is sufficiently maintained even at night when it is difficult to recognize the waves.

  A filter (wave impact load predicting means) 5 is provided in the signal path from the bow relative water level predicting means 4 to the controller 6 so that the dead zone 3c can be set for the bow relative water level predicted by the bow relative water level predicting means 4. Ignore small-scale waves, for example, foresee foreshore water and bottom slamming that should occur several waves ahead, and automatically handle the ship automatically by appropriate maneuvering such as deceleration and turning. It is possible to reduce the wave impact load.

It is explanatory drawing which shows the concept of the marine wave impact avoidance system as one Example of this invention. It is a conceptual diagram which shows the measured value and predicted value of a bow relative water level.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ship 1a Bow part 2 Bow relative water level measurement means 3a Time series waveform of bow relative water level 3b Prediction time series waveform 4 Bow relative water level prediction means 5 Filter 6 Controller P Computer

Claims (2)

  Based on the bow relative water level measurement means for measuring the relative water level at the bow of the ship navigating in the waves, and the time series waveform of the bow relative water level measured to date by the bow relative water level measurement means. A vessel relative water level predicting means for predicting a relative water level at the bow after a predetermined time, and the wave impact to be received by the ship based on the bow relative water level predicted by the bow relative water level predicting means. A marine wave impact avoidance system comprising automatic marine vessel maneuvering means capable of automatically and automatically transmitting marine vessel maneuvering commands relating to the setting and steering of the marine vessel speed in order to avoid the marine vessel.   A wave impact load predicting means for predicting a wave impact load based on the bow relative water level predicted by the bow relative water level predicting means is inserted as a filter in a signal path leading to the automatic ship maneuvering means. The marine wave impact avoidance system according to claim 1.

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