JPS60159626A - Supplying device of external force to model ship - Google Patents

Abstract

PURPOSE:To apply optional external force to a model ship which sails freely nearly in a natural state by mounting an air blower on the model ship movably in a wind force generation direction, and controlling the output of the air blower with the thrust of the air blower. CONSTITUTION:When a condition for applying specific external force to the model ship 10 is inputted to a computer 34, a thrust value is calculated and its output is inputted to respective controllers 33 for external force supplying devices 20A, 20B, and 20C for the bow, interior, and stern of the ship. Motors 24 are driven in correspondence to those inputs to rotate fans 29. The blowers 30 are given a thrust in the opposite direction of air blowing directions by the rotations of the fans 29 and movable bases 22 move in the air force generation directions against parallel springs 23. The moving forces are detected by load cells 31 and detection signals are fed back to the respective controllers 33 to control the rotating speeds of the motors 24 of the blowers 30 so that specific thrust values are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a device for applying an external force to a model ship, which applies a desired external force to a free-navigating model ship.

[Background Art] Conventionally, when various external forces, such as wind force, wave force, and pressure from tugboats, are applied to a ship while it is sailing, the ship's wake is investigated to determine the shape of the ship's hull, snake shape, etc., or to determine the ship's maneuvering method. Considerations are currently being made. In this case, conventionally, when investigating the influence of wind power, for example, calculations were made from the wind pressure area,
Although simulation calculations and other methods have been considered, satisfactory results have not always been obtained, and there was a desire for a device that could perform dynamic analysis of ships floating in the water.

For this reason, the model ship is supported by a tow truck and an external fan is used to generate wind to investigate the effect, but in this case it is difficult to generate a uniform wind. It's inconvenient. In addition, attempts have been made to place a fan directly on a model ship and use its reaction force to investigate the effect of wind, but in this case, the fan output, that is, the wind force, is controlled only by the fan's rotation speed. In addition to being affected by the surrounding wind, when measuring by changing the rotation direction of the fan, the state of wind generation at Seikon is different, and this method does not provide sufficiently accurate results. There was an inconvenience.

[Object of the Invention] An object of the present invention is to provide an apparatus for applying an external force to a model ship that can apply an arbitrary external force to a freely sailing model ship in substantially the same way as in a natural state.

[Structure of the Invention] The present invention provides a fan, a jet, and other wind power generating means movable in a direction parallel to the direction of wind power generation, and
A biasing means such as a parallel spring is provided for returning the wind power generating means to an initial position where the wind power generating means is not generating wind power, and further, when the wind power generating means generates wind power, the wind power generating means acts as a biasing means. Thrust detection means is provided for generating a detection signal by detecting the moving force moving in the parallel direction, that is, the thrust direction of the wind power generation means, and the detection signal of the generated thrust detection means is set to a preset value. In comparison, a control means is provided to control the output of the wind power generation means, and this allows the output of the wind power generation means to be controlled by its thrust, thereby reducing the effects of surrounding wind and the effects of forward and reverse rotation when using a fan. The purpose is to eliminate the effects of differences in raw wind power, etc., and to achieve the above objective.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

On the model ship 10, a total of three external force applying devices 20 are installed, one each at the bow, midship, and stern. Here, when it is necessary to express each external force applying device 20 individually, the bow, midship, and stern are respectively represented by external force applying devices 20A, 20B, and 20C,
When distinguishing and expressing the parts that make up each of these devices 20A, 20B, and 20C, A is used in the number of each part.
, B and C are added to distinguish them.

The external force applying device M20 is fixed to the model ship io, and a movable base 22 is attached to the base 21 at a predetermined distance from the base 21 via three pairs of parallel springs 23 as biasing means. is supported apart.

As a result, the rrf moving base 22 is normally returned to the initial position shown in 14 where the parallel spring 23 is not deflected when no external force is applied. The external force applying devices 20A and 20C are movable in a direction perpendicular to the plane of the drawing, and the external force applying device 920B at the center of the ship is movable in a direction indicated by an arrow P perpendicular to this. It is said that the direction is parallel to the direction.

A motor 24 and a motor 24 are mounted on the movable table 22.
fan unit 2 driven via belt 25 by
6 is placed, and this fan unit 26 is mounted on the movable base 2.
Shroud 27 attached to 2 and this shroud 2
7 and this stay 28
A fan 29 is rotatably supported by a shroud 27 via a bearing (not shown) provided at the center of the shroud 27 . In addition, the motor 24 and fan unit I/26
This constitutes a blower 4'l 30 as a wind power generating means. The directions in which wind power is generated by the blower 3o are such that the west side and the stern of the ship are perpendicular to the plane of the paper, that is, the width direction of the ship 10, and the center of the ship is perpendicular thereto, that is, the longitudinal direction of the ship 10.

At least one of the parallel springs 23 is provided with a load cell 31 consisting of a strain cage, a piezoelectric element, etc. as a thrust detection means, and this load cell 31 allows the wind force generated by the blower 3o to act against the parallel spring 23. The moving force by which the blower 30 itself is displaced, that is, the thrust (#t
#F) is detected, and a detection signal corresponding to the thrust is generated. Moreover, on the movable table 22,
An accelerometer 32 is provided approximately at the center of gravity above the movable base 22, and is adapted to obtain a correction signal in accordance with the amount of deformation of the parallel spring 23 due to centrifugal force or the like when the ship 10 tilts or turns.

The correction signal of the accelerometer 32 and the load cell 31
Both detection signals are given to a fan controller 33 as a control means. This fan controller 3
A microcomputer 34 is connected to the computer 34, and based on various conditions given to the computer 34, such as wind force, wave force, other forces to be applied, and the direction of their action, Predetermined thrust values rA, T, .

is calculated. These values T8, TB, Tl: are the fan controllers 33A, 33B, 33 connected to the external force applying devices 20A, 20B, 20C, respectively.
C and these controllers 33A.

33B, 33C, each thrust value TA, T8, T,.

and detection signals from each of the load cells 31A, 31B, 33C and each accelerometer 32A, 32B.

32C, and an output signal based on the difference is given to each motor 24A, 24B, 24C as a rotation speed signal ('i (i; positive value), and each wind power generator 2
The outputs of 0A, 20B, and 20C are controlled.

Note that the controller/roller 33 and the computer 34 may be installed inside the model ship 10 or outside the model ship 10, and when installed outside the ship, the signals can be exchanged wirelessly. If the model ship 10 is thick and there is no influence from the signal cable, a wired connection may be used.

Next, the operation of this embodiment will be explained.

When conditions for applying a predetermined external force to the model ship 10 are programmed in advance or input into the computer 34 at any time, the computer 34 controls each controller 3.
Thrust values Tc, T13, and TC to be given to T3 are calculated and output. When this output is input to each controller 33, an output corresponding to this human power is outputted as a voltage value to the motor 24, the motor 24 is driven at the rotation speed determined by this voltage value, and the fan 29 is rotated. .

When wind power is generated by the rotation of the fan 29, the blower 30 receives a thrust in the opposite direction to the direction of the wind blowing out as a reaction to the wind power, and this thrust causes the movable base 22 to resist the parallel spring 23. is moved in a direction parallel to the direction of wind generation.

This moving force is detected by the load cell 31, and its detection signal is fed back to each controller 33, and this value and the thrust values TA and T8 from the computer 34 are
, Tc are compared, and the output signal to the motor 24 is controlled so that the thrust of the blower 30 becomes a predetermined value. At this time, if the amount of displacement of the movable platform 22 changes due to tilting of the model ship 10 or the application of centrifugal force due to turning, an error will occur in the feedback value of the generated wind force by the amount of displacement, so that the feedback value from the accelerometer 32 will be Correct by output.

In this way, the motor 24 is driven by the fan controller 33 in accordance with commands from the computer 34, and the rotation speed of the motor 24 is controlled by the thrust signal fed back from the load cell 31, so that the rotation speed of the motor 24 is controlled according to a predetermined external force field. We will form a ship, and study how to maneuver the ship in this external force field and the shape of each part of the ship.

According to this embodiment as described in L, the blower 30 as a wind power generation means is mounted on the model ship 10 in a manner that allows it to move in a direction parallel to the direction of wind generation, that is, to detect thrust, and the output of the blower 30 is transmitted. Since the control is carried out by the thrust of the M machine 30, it is not affected by the influence of the surrounding wind or the difference in the generated wind force due to the forward and reverse rotation of the fan 29, and an accurate external force can be applied to the model ship 10. Additionally, there are 30 blowers on board.
Since the ship 10 is loaded, the ship 10 can sail freely, and it provides a more uniform external force field, that is, a wind force field, a tidal force (equivalent) field, and a wave force (equivalent) field, compared to the case where air is blown from the outside. This allows experiments to be conducted in conditions closer to natural environments. In addition, since it does not have a direct effect on the water, analysis of experiments can be facilitated. Furthermore, the external force applying devices 20 are installed at three locations: the bow, the stern, and the stern, and the direction of the wind force generated at the bow and stern is the lateral direction of the ship IO, and the direction of the wind force generated at the stern is set to be the longitudinal direction of the ship IO. Therefore, any external force field can be easily transformed into i
+u can be determined. Further, since the wind field can be arbitrarily set by simply changing the command value to the computer 34, the external force applied to the model ship 1O freely navigating underwater can be dynamically changed.

Furthermore, since the accelerometer 32 is provided, errors due to the inclination of the ship 10 can be corrected, and more accurate experiments can be performed.

In the above embodiment, three external force applying devices 20 are provided in one model ship 10, but the present invention is not necessarily limited to this, and four or more or two external force applying devices 20 may be provided as necessary.
The mounting direction is not limited to the longitudinal direction and the lateral direction of the model ship 10, but may be any angular direction.

At this time, the base 21 is provided so that the mounting angle can be changed with respect to the model ship 10, and a means for detecting this mounting angle is provided, and a signal of this mounting angle is also transmitted to the microcomputer 3.
If the configuration is configured such that it is input as a condition in 4, there is an advantage that experiments can be conducted with more flexible wind field settings. Also,
The wind power generation means is not limited to the blower 30, but may be a jet propulsion machine or other means. Furthermore, the thrust detection means is not limited to the load cell 31, but also includes the base 21 and the movable base 22.
Alternatively, the thrust may be increased by measuring the amount of displacement with respect to the thrust member, and calculating the thrust using a computer based on this amount of displacement and a predetermined spring constant of the biasing means. In addition, the biasing means is not limited to the parallel spring 23, but may be other means, for example, the movable base 22 is supported on the base 21 via a bearing etc. in a slidable manner with low friction, and the movable base 22 and the base 22 are A structure may also be used in which a coil spring or the like for returning to the initial position is stretched between. Furthermore, the fan controller 33 and the microcomputer 34 may be configured as an integrated control unit instead of being separated.

As described above, according to the present invention, an arbitrary external force can be applied to a freely sailing model ship in substantially the same way as in a natural state.

[Brief explanation of drawings]

The figure is a schematic configuration diagram showing one embodiment of the present invention. io...Model ship, 20...External force applying device, 23...
-Parallel spring as biasing means, 26...Fan unit, 30...Blower as wind power generation means, 31...
- Load cell as thrust detection means, 32...accelerometer, 33...fan controller as control means, 34...microcomputer. Agent: Patent attorney Minoru Kinoshita (and one other person)

Claims (1)

[Claims] (1) A wind power generation means that generates wind power in a predetermined direction and is supported movably in a direction parallel to the wind power generation direction, and the wind power generation means is moved to an initial position where the wind power generation means is not generating wind power. a biasing means for returning the vehicle to its original state; a thrust detecting means for generating a detection signal by detecting a moving force of the wind generating means in a direction parallel to the direction in which the wind is generated, which resists the biasing means when the wind is generated; and this thrust detecting means. 1. A device for applying an external force to a model ship, comprising: a control means for controlling the output of the wind power generation means by comparing a detection signal of the above with a preset value.