JPH01262291A - Trimming device for water-jet propulsion ship - Google Patents

Abstract

PURPOSE:To keep off the occurrence of hull's pitching as well as to make a hull position keepable in stable horizontally all the time by driving and controlling a deflector attached to an injection nozzle end free of vertical rotation with the hull position and a signal of a headway detector. CONSTITUTION:A deflector 7 is attached to an end of an injection nozzle 5 for a water jet propulsion machine free of vertical rotation, thereby making the jetting direction vertically variable. A hull's position and headway are detected by a detector, and on the basis of each detected value, a turning angle of the deflector and its period are controlled. This control turns the deflector upside when the hull is entering a trough of waves and the bow gets lowering, and in case of reversal, it turns deflector upside down. With this constitution, pitching of the hull is kept back and thereby the hull position can be kept in stable horizontally all the time.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a trim adjustment device for a water jet propelled ship, and in particular, to prevent so-called pitching, which is vertical rocking of the ship's hull, This invention relates to a trim adjustment device for a water jet propulsion vessel that enables navigation in a stable attitude at all times.

(Conventional technology) A waterjet propelled vessel is generally shown in Figure 9(a).

As shown in (b), water jet propulsion 1fiA is installed, and this waterjet propulsion mA is
A water stream is introduced from a water intake port 2 provided at the bottom of the vessel, the introduced water stream is pressurized by a pump impeller 4 rotated at high speed by a drive unit 3, and the pressurized water stream is sent to a jet water stream 6 from an injection nozzle 5 provided at the stern. The reaction force of the ejected jet water stream 6 is obtained as thrust.

The injection nozzle 5 is configured to be rotatable in the horizontal direction, and a jet water stream 6 is ejected from the frontage of the injection nozzle 5.
By adjusting the jetting direction, the horizontal attitude of the hull 1 can be controlled.

In other words, when a water jet propulsion vessel experiences waves or crosswinds while sailing, and the hull receives a horizontal deflection force and the hull attitude and equilibrium state (trim) change, the injection nozzle 5 is placed on the side where the deflection force acts. The hull 1 is rotated and the deflection force is offset by the reaction force of the jet water stream 6 that is injected.
Equipped with a trim adjustment device that maintains the correct posture.

(Problem to be Solved by the Invention) As described above, the conventional trim adjustment device for a water jet propulsion boat is equipped with an injection nozzle that rotates in the horizontal direction, and by changing the injection direction of the jet water stream, the horizontal attitude of the hull can be adjusted. It performs the function of controlling. However, it does not have a function to control the posture due to the so-called pitching phenomenon in which the hull 1 swings in the traveling direction (longitudinal direction).

Therefore, when the hull 1 tilts forward as shown in FIG. 9(a), the thrust of the water jet propulsion IA acts in the bow direction, causing the bow to plunge into the next wave crest. On the other hand, if the bow of the boat runs aground on the crest of a wave as shown in FIG. 9(b), the bow of the boat floats further upward due to the thrust acting in the direction of the bow. If the bow advances to the next wave trough with the bow raised, the bow will drop rapidly and the bottom of the hull will violently collide with the water surface at the wave trough.

In this way, when the height and period of the waves and the characteristic values such as the size of the hull 1 become a certain ratio and reach a resonance state,
The above-mentioned rising and falling of the hull occurs repeatedly, and alternating loads are applied to the hull, which may cause fatigue of the hull structural members or cause significant damage to the hull itself. There is also another problem in that the pitching of the hull reduces ride comfort, causing fatigue and discomfort to passengers and crew.

The present invention has been made in order to solve the above problems, and is a water vessel that prevents vertical rocking (pitching) of a ship's body during navigation and enables the ship to always navigate in a stable posture. The purpose of the present invention is to provide a trim adjustment device for a jet propulsion vessel.

[Structure of the invention]

(Means for Solving the Problems) A trim adjustment device for a water jet propulsion boat according to the present invention pressurizes a water flow introduced from the bottom of the ship using a jet pump to form a jet water flow, and the jet water flow is directed rearward from an injection nozzle provided at the stern. A water jet propulsion device that obtains thrust by injecting a jet water stream, a deflector that is movably attached to the end of the jet nozzle and adjusts the jet direction of the jet water stream up and down, and detects the attitude of the ship and its detection signal. The present invention is characterized by comprising a control device that drives and controls the deflector based on the following.

(Function) According to the trim adjustment device for a water jet propelled boat having the above configuration, the degree of inclination of the hull from the horizontal position to the vertical direction is detected by the attitude detector or the like, and the detection signal is inputted to the control device. The control device calculates the rotation angle of the deflector necessary to recover the attitude based on the detection signal from the attitude detector, and drives and controls the deflector based on the result of the calculation.

When the hull reaches the trough of the waves and the bow points downward,
The deflector is driven so that its opening is directed diagonally upward and rearward of the hull. The jet stream ejected obliquely upward to the rear generates a thrust force acting in the direction of travel and a pressing force that presses the stern downward.

This pressing force prevents the bow side from descending,
The entire hull is held in a horizontal position.

On the other hand, when the hull approaches the crest of a wave and the bow of the hull is directed upward, the deflector is driven so that its opening is directed diagonally downward to the rear of the hull. The jet stream ejected diagonally downward to the rear generates a thrust acting in the traveling direction and a push-up blade that pushes the stern upward, and this push-up blade prevents the bow side from rising.

In other words, by adjusting the opening direction of the deflector up and down according to the state of waves on the water surface, and controlling the direction of the jet water jet from the water jet propulsion machine, vertical rocking of the hull is prevented, and the hull is You can always keep your posture stable and horizontal.

(Example) Next, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a side view showing an embodiment of the 1-rim adjusting device for a water jet propulsion boat according to the present invention, and FIGS. FIG. 2 is a sectional view, a plan view, and a side view.

Note that the same elements as those in the conventional example shown in FIGS. 9(a) and 9(b) are given the same symbols.

As shown in FIG. 1, the trim adjustment device for a water jet propulsion boat according to the present embodiment pressurizes a water flow introduced from the bottom of the ship using a jet pump to form a jet water flow 6, which is emitted backward from an injection nozzle 5 provided at the stern. a water jet propulsion device A that obtains thrust by injecting a jet water stream 6 to a water jet, a deflector 7 that is movably attached to the end of the injection nozzle 5 and adjusts the jet direction of the jet water stream 6 up and down, and the attitude of the hull. and a control device 12 that detects and controls the deflector 7 based on the detection signal.

Here, the detailed structure of the deflector 7 is shown in FIGS. 2 to 4. The deflector 7 is formed by attaching a pair of bisected guide plates 8a and 8b formed to match the curvature of the inner circumferential surface of the injection nozzle 5 to the end of the injection nozzle 5 so as to be movable in the vertical direction. Ru.

The upper and lower guide plates 8a and 8b are rotatably supported at the upper and lower ends of the injection nozzle 5 via support fittings 9a and 9b, respectively, and both guide plates 8a and Bb are
They are connected by a connecting fitting 10. Both guide plates 8a,
8b is integrally driven in the vertical direction by a drive device 11 connected to the upper support metal fitting 9a via a link mechanism. As the drive device 11, a servo motor, a hydraulic cylinder, etc. are used.

Further, the hull 1 is provided with an attitude detector 13 that detects the attitude of the hull. As this attitude detector 13, for example, as shown in FIG. 5, a U-shaped tube 16 filled with mercury 15 or the like is used. A large number of photocells 1 are arranged along the tube wall of this U-shaped tube 16.
7 is provided, and a lamp 18 for illuminating the phototube 17 is also provided.

The degree of inclination .theta. of the ship's body can be easily detected by using the phototube 17 to detect the liquid level of the mercury 15, which changes depending on the degree of inclination .theta. of the ship's body 1. The control angle of the deflector 7 is calculated based on this inclination detection signal, and the drive device 11 is activated by the control signal. The frontage direction of the deflector 7 is adjusted by the drive device 11, and the jetting direction of the jet water stream 6 from the water jet propulsion device A is controlled.

Next, using the device according to this example, we will specifically explain the hull attitude (
The operation for adjusting trim) will be explained with reference to FIGS. 6(a) and 6(b). In FIG. 6(a), when the hull 1 approaches the trough of the waves and the bow begins to descend downward, the vertical inclination θ of the hull 1 is detected by the attitude detector 13. The control device 12 rotates the deflector 7 upward based on the inclination detection signal, and changes the ejection direction of the jet water flow 6 to rearward and obliquely upward. At this time, the thrust force T caused by the jet water flow 6 is dispersed into a thrust force Th acting in the direction of movement of the hull 1 and a pressing force TV pressing the stern downward. Since the pressing force TV suppresses the bow side from descending, the hull is held horizontally as a whole.

On the other hand, as shown in FIG. 6(b), when the hull 1 approaches the crest of a wave and the bow is about to turn upward, the deflector 7 is controlled by the control device 12 so that its opening is oriented backward and diagonally downward. Rotated. The thrust force T caused by the jet water stream 6 injected obliquely downward to the rear generates a thrust force Th that acts in the direction of travel and a push-up blade TU that pushes the stern upward. This push-up blade Tu suppresses the bow side from rising.

In other words, the force that acts to push up or lower the bow of the ship and the push-up blade Tu or pressure TV generated on the stern side by changing the injection direction of the jet water stream 6 up and down cancel each other out, and the hull 1 Vertical shaking, or pitching, is suppressed. In this way, the hull 1 is always maintained in a horizontal state even when sailing through the crests or troughs of waves.

Next, FIG. 7 shows an example of the configuration of a control device for performing more advanced trim adjustment.

The control device 12 of the trim adjustment device for a waterjet propelled boat according to the present embodiment includes an attitude detector 13 that detects the vertical inclination of the boat from the horizontal position, and a boat speed detector that detects the boat speed. 14, attitude detector 13I3 and ship speed detector 1
The deflector 7 is composed of an arithmetic unit 19 that calculates the rotation period of the deflector based on the detection signal from the arithmetic unit 4, and a drive device 11 that drives the deflector 7 based on the output signal from the arithmetic unit 19.

In this embodiment, the rotation period of the deflector 7 that allows the ship to sail stably is calculated based on the detection signals from the attitude detection device 13 and the ship speed detector 14.
It automatically adjusts the trim of the boat. That is, while calculating the period t in which the bow moves up and down from the temporal change in the detection signal from the attitude detector 13, the ship speed V at that time is calculated. is detected by the ship speed detector 14. This ship speed V. When the boat moves in the direction of waves, the hull 1 can maintain a stable attitude by rotating the deflector 7 in the vertical direction at the circumference WAto.

Further, when the ship speed is increased or decreased to 1, the rotation period t1 of the deflector 7 necessary for stable navigation is given by the following equation 1).

That is, when the period, height, etc. of waves in front of the hull are constant, the rotation period t1 of the deflector 7 is automatically set based on the ship speed vi, and the trim force is automatically applied.

Furthermore, the period of minute attitude changes of the hull 1 and the rate of change in ship speed are inputted to the control device 12 as appropriate, and the rotation period of the deflector 7 is changed more precisely, thereby stabilizing the hull with higher precision. It can be implemented.

Next, the configuration of the control device 12 that can perform trim adjustment with even higher precision is not shown in FIG.

The fli control device 12 of this embodiment includes a monitored device 20 that monitors the state of waves in front of the boat as shown in FIG.
An image processor 2 that performs image processing on the video signal from the monitored device 20 and inputs the obtained wave height and period to the arithmetic unit 19
It is configured by adding 1.

Here, the monitored device 20 includes a normal television camera,
Infrared cameras are used, and this television camera is mounted on the bow of the ship.

The state of the waves in front of the boat photographed by the monitored device 20 is transmitted to the image processor 21 as a video signal. The image processor 21 performs image processing on the video signal to calculate the height and period of the wave, and inputs the calculation results to the calculator 19 . Arithmetic unit 1
9 predicts the attitude of the boat by combining the attitude detection signal from the attitude detector 13 and the ship speed signal from the ship speed detector 14 with the wave height and period, and calculates the rotation period of the deflector 7. and the rotation angle are calculated and inputted to the drive device 11 as a control signal. The drive device 11 drives the deflector 7, adjusts the jet direction of the jet water stream 6 up and down, and maintains the hull attitude horizontally at all times.

According to this embodiment, the state of the waves in front of the route is grasped in advance and the deflector 7 is controlled according to the predicted attitude of the ship, so it is possible to quickly respond to changes in the ship speed or the state of the waves. is possible. Therefore, control delays can be reduced, and changes in the attitude of the ship can be minimized.

(Effects of the Invention) As explained above, according to the trim adjustment device for a water jet propulsion vessel according to the present invention, the opening direction of the deflector is adjusted up and down according to the state of the waves on the water surface on which the boat is sailing, and the water jet propulsion By controlling the direction of the jet water flow, vertical rocking of the hull is prevented, and the hull posture can be maintained in a stable horizontal state at all times.

Therefore, the ride comfort during navigation is improved, and the crew and passengers do not feel fatigued or uncomfortable.

In addition, the impact force acting on the hull is alleviated, making it possible to reduce fatigue and damage to the hull itself, which has a great effect on the stable operation of waterjet propelled ships.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a trim adjustment device for a water jet propelled boat according to the present invention, and FIG. 2 is a sectional view showing an embodiment of a deflector constituting the trim adjustment device for a water jet propelled boat. Figure 3 shows ■-■ in Figure 2.
4 is a side view taken from the IV-rV arrow in FIG. 2; FIG. 5 is a side view showing an example of the configuration of the attitude detector; FIG.
Figure (a). (b) is a side view showing a state in which the device of the present invention is used to adjust the hull attitude by ejecting jet water streams upward and downward, respectively; FIG. 7 is a block diagram showing the configuration of the control device; Figure 8 is a block diagram showing another configuration of the control device, Figure 9 (a) is a side view showing a conventional water jet propulsion vessel tilted forward, and Figure 9 (b) is also tilted backward. FIG. 1... Hull, 2... Water intake, 3... Drive machine, 4...
... Pump impeller, 5... Injection nozzle, 6... Jet water stream, 7... Deflector, 8a, 8b... Guide plate, 9a, 9b... Support fitting, 10... Connection fitting , 11... Drive device, 12... Control device, 13...
・Attitude detector, 14...Ship speed detector, 15...Mercury, 16...0-shaped tube, 17...Phototube, 18...Lamp, 19...Arithmetic unit, 20...・Wave monitoring device, 21
...Image store I! 12 units, △...Water jet propulsion sea, θ...Slope. Applicant's representative Hisada Hatano 1I21I 3rd and 7th L

Claims (1)

[Scope of Claims] 1. A water jet propulsion machine that pressurizes a water flow introduced from the bottom of the ship using a jet pump to form a jet water flow, and obtains thrust by injecting the jet water flow rearward from an injection nozzle provided at the stern; A deflector that is movably attached to the end of the jet nozzle and adjusts the jetting direction of the jet water stream up and down, and a control device that detects the attitude of the ship and controls drive of the deflector based on the detection signal. A trim adjustment device for waterjet propulsion vessels featuring: 2. The control device includes an attitude detector that detects the vertical inclination of the ship from the horizontal position, a ship speed detector that detects the ship's speed, and a control device based on detection signals from the attitude detector and the ship speed detector. 2. The trim adjustment device for a water jet propulsion vessel according to claim 1, further comprising: a computing unit that computes the rotation period of the deflector; and a drive device that drives the deflector based on an output signal from the computing unit. 3. The control device includes a wave monitoring device that monitors the state of the waves in front of the boat, and an image processing device that processes the video signal from the wave monitoring device and inputs the obtained wave height and period to a computing unit. 3. The trim adjustment device for a water jet propulsion vessel according to claim 2, comprising: a trim adjustment device for a water jet propulsion vessel.