JPS61205836A - Apparatus for testing reaction fin - Google Patents

Abstract

PURPOSE:To make it possible to simply calculate lift corresponding to the mount angle of each fin blade, by radially implanting fin blades to the stern boss of a model ship through a mount angle adjusting mechanism and adhering a strain gauge to the strain generating part of the base part of each fin blade. CONSTITUTION:The change quantity in a flow direction by a fin blade 2 corresponds to the lit generated in the fin blade 2 in the relation of action and counteraction. Therefore, by accurately measuring the lift generated in the blade 2 by a strain gauge 5, the mount angle of each blade 2 can be easily and accurately set so as to obtain the change quantity in a scheduled flow direction. By this method, the mount angle of each blade is applied to an actual ship properly determined along with the measured data by the gauge 5. Because the gauge 5 is adhered to a strain generating part 4b formed into a plate shape, the accurate quantity of strain can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a test device for reaction fins provided on ships in general for energy saving purposes, and more particularly to a device for testing the mounting angle of reaction fins at the stern of a ship.

[Conventional technology]

Generally, when installing reaction fins on the stern, the washing area at the fin blade installation position is measured using a 5-hole pitot tube, etc., and the measured flow is The mounting angle of each fin blade is set to give the planned angle of attack.

By the way, since the direction and velocity of the flow in the stern section vary depending on the location, the flow to each fin blade also varies depending on the location.

Conventionally, therefore, a method has been taken in which the flow for each fin blade is averaged, this flow is regarded as a representative flow, and the mounting angle of each fin blade is set with respect to that direction.

[Problem that the invention seeks to solve]

However, with such conventional means, the amount of change in the flow direction given by the reaction fins is often not the planned amount, and in order to set the mounting angle of the +77 comb fins to an appropriate value, the above-mentioned operation is required. There is a problem in that the optimum mounting angle must be found repeatedly through trial and error.

The present invention attempts to solve the above-mentioned problems, and detects the fluid force applied to each fin blade as strain generated at the base of the fin blade, and changes the flow direction by each fin blade. An object of the present invention is to provide a reaction fin testing device that can appropriately set the mounting angle of a fin on the fin by measuring the amount of the reaction fin.

[Means for solving problems]

For this reason, the reaction fin testing device of the present invention is installed on the stern boss of a model ship in order to test each mounting angle of a plurality of fin blades on the stern reaction fin.
The present invention is characterized in that the fin blades are installed radially through an attachment angle adjustment mechanism, and a strain gauge is attached to a strain-generating portion at the base of the fin blades.

[Effect]

In the reaction fin testing device of the present invention described above, measurement is performed using a strain gauge at the strain-generating portion of the base of each fin blade installed in the stern boss of a model ship, and each fin blade is measured based on the measured value. It becomes possible to accurately detect the amount of change in the flow direction of the water due to the change in the flow direction, and thereby the mounting angle of each fin blade can be appropriately set to obtain the required amount of change in the flow direction.

〔Example〕

The reaction fin testing apparatus of the present invention will be explained below with reference to the drawings. Figures 1 and 2 show the reaction fin testing apparatus as the first embodiment of the present invention, and Figure 1 shows the port side thereof. 2 is a partial cross-sectional view showing the vicinity of the base of the fin blade, and FIG. 3 is a partial cross-sectional view showing a reaction fin testing apparatus as a second embodiment of the present invention, corresponding to FIG. It is a diagram.

As shown in FIG. 1, a test device for a reactor as a first embodiment of the present invention is installed at the stern of a model ship.
A plurality of fin blades 2 are radially installed on a stern boss 3 formed on the hull concentrically with an unillustrated boat through an attachment angle adjustment mechanism.

That is, the force detection part 4 at the base of each fin blade 2
As shown in FIG.
A fin blade 2 is rotatably attached to the fin blade 2 and fixed by a set screw 6.

As described above, since the fin blade 2 is rotatably mounted around the force detection block 4a, the fin blade 2 can be rotated to a desired mounting angle and fixed with the set screw 6. , a cylindrical block 4a that fits into the fin blade 2, and a set screw 6 constitute a mounting angle adjustment mechanism for the fin blade 2.

The plate-shaped strain-generating portion 4b has its proximal end fixed to the recess 3a of the stern boss 3 with an adhesive 7, and a strain-generating portion 4b is affixed to the exposed portion of the strain-generating portion 4b. ing.

Although only the port side portion of the device is shown in FIG. 1, the device has a starboard portion similar to that of a ship on the right side of the hull suspension line 1.

Since the test device for a rear axle fin according to the first embodiment of the present invention is constructed as described above, while systematically changing the mounting angle of each fin blade 2, the flow generated along the stern causes the The lift force can be easily and accurately determined based on the measured value of the strain dage 5 at the base of the fin blade 2.

Incidentally, the amount of change in the flow direction caused by the fin blade 2 and the lift force generated in the fin blade 2 correspond to each other in the relationship of action and reaction.

Therefore, by accurately measuring the lift force generated by each fin blade 2 using the strain dage 5, the mounting angle of each fin blade 2 can be easily and accurately adjusted to obtain the planned amount of change in the flow direction. Can be set.

In this way, the mounting angle of each fin blade 2 is appropriately determined based on the measurement data by the strain gauge 5, and is applied to the actual ship.

Further, in this device, since the strain gauge 5 is attached to the strain generating portion 4b formed in a plate shape, it is possible to accurately measure the amount of strain.

Furthermore, the fin blade 2 can be moved by operating the set screw 6.
It becomes easy to attach and remove it.

Rotation and fixation of the fin blade 2 can be easily performed by operating the set screw 6, and thereby the mounting angle of the fin blade 2 can be quickly adjusted.

The reaction fin testing device as a second embodiment of the present invention shown in FIG. A remotely controllable motor 11 is used as the angle adjustment mechanism.

The fin blade 2 is fixed to the block 4a of the cylindrical lateral force part 4 via a knock pin 8,
A strain gauge 5 is attached to the strain generating section 4b of the force detecting section 4, and a cylindrical member 9 is also fixed thereto.

The cylindrical member 9 is rotatable while being guided along the cylindrical inner wall surface of the recess 3a of the stern post 3.
A rotating shaft of a small motor (for example, a step motor) whose rotation angle is controlled is connected to the base end of the motor.

The motor 11 is fixed inside the stern post 3, and the motor 1
1, the fin blade 2 is rotated together with the force detecting section 4 and the cylindrical member 9, so that the mounting angle of the fin blade 2 is adjusted.

In order to prevent the cylindrical member 9 from deviating outward, a stopper 10 is provided to protrude from the inner wall of the four parts 3a.

The reaction fin testing device according to the second embodiment of the present invention is configured as described above, so that in addition to obtaining almost the same effects as the first embodiment, 119E can be performed extremely easily by remote control of the motor 11.

Furthermore, in the second embodiment, since the mounting angle W14 of the fin blade 2 is adjusted by remote control, the reaction fin test work can be carried out extremely efficiently as a whole.

〔Effect of the invention〕

As described in detail above, according to the reaction fin testing device of the present invention, in order to test each of the mounting angles of a plurality of fin blades on the stern reaction fin, the fin blades are attached to the stern boss of a model ship at the mounting angles. It has a simple structure in which the fin blades are installed radially through an adjustment mechanism, and a strain gauge is pasted on the strain-generating part at the base of the fin blade, and each fin blade is attached based on the measured value of the strain gauge. It becomes possible to easily determine the lift force corresponding to the angle, and thereby the mounting angle of each fin blade can be easily and accurately set so as to obtain the amount of change in the flow direction as planned.

Furthermore, since the strain gauge is attached to the strain-generating portion at the base of each fin blade, there is an advantage that highly accurate measurement can be performed.

[Brief explanation of drawings]

Fig. 1 is a front view showing the port side of the test fin, Fig. 2 is a partial sectional view showing the vicinity of the base of the fin blade, and Fig. 3 corresponds to Fig. 2. FIG. 3 is a partial cross-sectional view showing a reaction fin testing device as a second embodiment of the present invention. 1. Hull center line, 2. Fin blade, 3. Stern boss, 3a. Recess, 4. Force detection section, 4a. Force detection section block, 4b. Strain generating section, 5. Strain. Gauge, 6...Press screw, 7...Adhesive, 8...Knock bottle, 9...Cylindrical member, 10...Stopper, 11...Motor. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In order to test the mounting angles of the plurality of fin blades on the stern reaction fin, the fin blades were installed radially on the stern boss of a model ship via a mounting angle adjustment mechanism, and the strain at the base of the fin blades was measured. A reaction fin testing device characterized by having a strain gauge attached to the part.