JPS6098331A - Wind tunnel testing device of ship and marine structure - Google Patents

Abstract

PURPOSE:To vary a model for wind tunnel test to an optional testing attitude and to prevent a turbulent flow, a vortex flow, etc. in wind tunnel flowing air by providing a dynamometer, to which the model for wind tnnel test is attached, in a liquid tank installed under the floor of a wind tunnel. CONSTITUTION:An open hole 10A in the upper end of a liquid tank 10 is fitted and fixed to an aperture 11 of a wind tunnel floor 1, and a cradle truck provided with casters and leg screws contacting the floor is provided under a tank bottom part 10C. A model 14 for wind tunnel test is attached onto a dynamometer 12 placed in the liquid tank 10, and a dynamometer movable supporting device 20 supports the dynamometer 12 in the liquid tank so that the model 14 can be moved to an optional wind tunnel testing attitude. An ascending and descending base 22 of the supporting device 20 is moved vertically by the screwing action due to rotation of four vertical supporting threaded shafts 21, and a base 25 moving in the longitudinal direction is moved forward and backward along the axial line of the wind tunnel. An inclining base 27 is supported pivotally in the front end part of the moving base 25 so that base 27 can be inclined with a revolving shaft 26 as a fulcrum, and a turntable 29 is supported on the inclining base 27.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) This invention relates to a wind tunnel testing device for ships and 1JR1 offshore structures.

[Technical backbone of the invention and its problems]

The wind pressure and moment acting on ships and offshore structures are considered as design external forces, and their estimated forces (although important, the theoretical estimation method has not been fully established, and currently the estimation is based on wind tunnel tests. is the most effective means.For this reason, conventionally,
Wind tunnel tests using models have been carried out, and the wind tunnel test equipment, as shown in Fig. 1, has a circular opening 1a@ in the wind tunnel floor 1, and a power meter 2 is connected to this opening. As shown in Fig. 2, there is a method of measuring by placing a rotating disk 3 on which the wind tunnel floor 1
There is a method in which a model insertion hole 5 is provided, the legs of the model 4 are inserted into the hole, and the model 4 is attached to an external force meter 2 for measurement.

However, with these test devices, it is not possible to change the model 4 to any desired wind tunnel test posture.
If you try to conduct a test in a tilted state, you will have to manufacture the number of models 4 corresponding to the test state, and you will also have to replace the models 4 every time you change the test state, which will increase the cost. The drawback was that it was time consuming. In addition, in order to make the model 4 changeable to any desired test posture, it is possible to provide a large opening in the wind tunnel floor 1 and to have the force meter attached to the model supported by a movable support device so that the posture can be changed more easily. However, when such a structure is adopted, the large opening of the wind tunnel floor 1 generates turbulence and eddy currents for wind tunnel circulation, causing problems in the wind tunnel experiment itself, such as inability to perform accurate measurements.

[Purpose of the invention]

This invention was made in order to eliminate the above-mentioned conventional drawbacks. [1] The model for wind tunnel testing can be changed to any test posture, and the wind tunnel floor has a structure for changing the posture of the model. To provide a wind tunnel testing device which does not generate turbulence or vortices in the wind flowing through the wind tunnel even if a large opening is provided, and can perform accurate measurements.

[Summary of the invention]

The m-tunnel testing device of the present invention includes a liquid tank installed under the wind tunnel floor and having a tank L1 on the side of the wind tunnel body, and a test model located in the liquid tank and mounted above with a model for wind tunnel testing protruding into the wind tunnel. and a test force movable support device that supports the test force meter in a liquid tank so that the model can be moved to any wind tunnel test posture, and a test force movable support device that supports the test force meter in a liquid tank so that the model can be moved to an arbitrary wind tunnel test posture, and a liquid level changer for wind tunnel circulation is provided in the liquid tank. The wind tunnel test is performed by filling the wind tunnel floor with a liquid that does not form or scatter to a level that blocks the opening of the wind tunnel floor. In this embodiment, the liquid filled in the liquid tank is composed of water filled in the liquid tank up to the vicinity of the wind tunnel floor opening, and silicone oil, etc., which is floated in a layer on the water surface and filled to the level where the wind tunnel floor opening is blocked. Use a viscous liquid, or only a viscous liquid such as silicone oil filled to the level of blocking the wind tunnel floor opening. The force meter movable support device is equipped with an elevating platform, a longitudinally movable platform, a tilting platform, and a rotary platform that support the dynamometer that can be used to remove the model in a vertically movable, horizontally movable, tiltable, and rotatable manner. It has become a reality.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described with reference to the drawings in FIGS. 3 to 11. In the drawings, reference numeral 1 denotes a wind tunnel floor, on which a model 14 for wind tunnel testing can be moved to any test posture. A large frontage 11 is provided. 10 is the wind tunnel floor 1
This is a liquid tank installed on the lower side, and has a hole opening 10A at the upper end that is fitted and fixed to the wind tunnel floor opening 11, and is equipped with casters 15 and floor leg screws 16 below the tank bottom 10C. A fixed trolley 10B is provided (as clearly shown in Figure 4). 1
2 is located in the liquid tank 10, and a model 1 for wind tunnel testing is placed above it.
4 is a power meter installed in a protruding state in the wind tunnel, and this power meter 1 is a water power meter with a built-in strain gauge.
A waterproof type is used because it is installed submerged in water. Reference numeral 20 denotes a force i1 movable support device that supports the force meter 12 in the liquid tank 10 so that the model 14 can be moved to any wind tunnel test posture. A lifting platform 22 is moved up and down by a screw feeding action caused by the rotation of a shaft 21, and a lifting platform 22 is guided by a double rail 23 on this lifting platform and moved in the direction along the wind tunnel qlt line by a screw feeding action caused by the rotation of a single screw shaft 24. A front-back moving table 25 that is moved back and forth, a tilting table 27 that is pivoted to the front end of the front-back moving table 25 so as to be tiltable about the rotating shaft 2G, and a tilting table 27 that is mounted on the tilting table 27. The power meter 12 is mounted on the two rotary tables, and a wind tunnel test model 14 is placed on top of the power meter 12. is installed in the wind tunnel in a protruding state as shown in Figure 3.

The upper end of the vertically movable screw shaft 21 (four vertical support screw shafts) of the lifting table 22 is supported by the tank fixing bracket 30, and the shaft end that penetrates the tank bottom 10C in a watertight manner and projects downward. A chain sprocket 31 is attached, and by rotating a chain 33 wound between each sprocket and the idle sprocket 32 as shown in FIG. 6 by a lifting motor 34, the four screw shafts 21 are rotated synchronously in the same direction.
A number of reduction gears 358, which are screwed into the lower screw piece (not shown) of 5 and arranged at the front end of the lifting platform 22, are rotated in forward and reverse directions by being operated by the rotation of the intraoral vertical spline shaft 35b. Note that the spline shaft 3
5b is a longitudinal movement motor 3 attached to the lower side of the tank bottom 10C.
The rotation of the spline shaft 35b causes the helical shaft 24 to rotate in the forward and reverse directions via the reduction gear mechanism 35a. The tilting mechanism 37 of the tilting table 27 is connected to a tilting motor 36 which is located beside the longitudinal movement motor 35 and is attached to the lower side of the bottom part 10C, and which is directly connected to this motor shaft.
10, a spline shaft 36b vertically erected within the M base 22, a reduction gear mechanism 36a which is mounted on the M base 22 and is operated by the rotation of the spline shaft 36b, and a reduction gear mechanism 36a which is connected to the output shaft of the reduction gear mechanism 36a and which is connected to the output shaft of the reduction gear mechanism 36a. The reduction gear mechanism 3 extends parallel to the screw shaft 24 and the double rail 23
a spline @38 rotated forward and backward by 6b;
A spline engaging body 40 has three bevel gears that are spline-engaged with the spline shaft 38 and move in cooperation with the longitudinally movable table 25, and a shaft 4 is attached to the rear end of the longitudinally movable table 25.
'1, a bevel gear 42 meshes with the three bevel gears mounted as shown in FIG. It is composed of a threaded rod 44 and a nut piece 46 that engages with the threaded rod 44 which is rotatably supported by a pin on the rear end fitting 45 of the tilting table 27, and the vertical spline shaft 36b in the tank is rotated by the motor 36. Then, reduction gear machine 1
36b rotates the spline shaft 38, and this rotation rotates the threaded rod 44 via the bevel gear 39° 42 and the universal joint 43, and the vertical movement of the nut piece 46 that meshes with this threaded rod causes the rotation of the spline shaft 38. The tilting table 27 can be tilted at any angle using the rotary ring 26 as a fulcrum.

The separate rotating tank 49 of the rotating table 29 has a rotating motor 50 attached to the lower rear position of the tank bottom 10C, a spline shaft 50b that is directly connected to the motor shaft and stands vertically in the liquid 11i10, and the lifting table 22. A reduction gear mechanism 508 is attached to the upper rear end portion and is operated by the rotation of the spline shaft 50b, and a moving platform (the reduction gear mechanism extending in the multi-motion direction) is connected to the output shaft of the reduction gear m4150a. mm
50a, a spline shaft 51 rotated forward and backward; a spline engaging body 53 having a bevel gear 52 that engages with the spline shaft and moves back and forth in cooperation with the moving table 25; and a spline on the moving table 25. ti of the tilting table 27, which is supported near the engaging body by a plurality of bearings 54 so as to be orthogonal to the spline shaft 51, as shown in FIGS.
A rotary shaft 26 on which an n-moving fulcrum bearing 27a is supported, a bevel gear 55 that meshes with the bevel gear 52 attached to one end of the rotary shaft 26, and a position near the longitudinal center line of the rotary table of the rotary shaft 26. The attached bevel gear 56 and the tilting table 27
a shaft 58 perpendicular to the rotating shaft 26 supported by a plurality of bearings 57 on the lower side as shown in FIGS. 10 and 11;
A bevel gear 59 that meshes with the bevel gear 56 disposed on the front end of the shaft, a worm 60 disposed on the rear end of the shaft 58, and the rotary table rotation center information 2.
The worm wheel 61 is attached to a lower end protruding shaft portion penetrating the tilting table 27 of 8 and is configured to mesh with the worm 60.

Then, the rotary table rotation separate tank 49 + and the rotation motor 50
4fl 1t (vertical spline shaft 50b)
and the front 8-spline shaft 5 via the reduction gear mechanism 50a.
1 is rotated, the rotating shaft 2 is rotated by the meshing of the bevel gears 52 and 55.
6 rotates, and the rotation is transmitted to the shaft 58 in conjunction with the bevel gears 56 and 59, and this shaft rotation is transmitted to the worm 60.
, is transmitted to the rotation center shaft 28 of the rotary table 29 via the worm wheel 61, and the rotary table 29 is rotated to an arbitrary position. Note that the vertical movement of the lifting table 22, the longitudinal movement of the movable table 25, the tilting of the tilting table 27, and the rotation of the rotary table 29 are performed separately. This is automatically performed by operating a switch on a control panel 62 shown in FIG.

The liquid Iff 10 is filled with liquid WO, which does not cause the liquid surface to deform or scatter during wind tunnel circulation, up to the level where the frontage of the wind tunnel floor 1 is closed, as shown in FIG. 3. Note that the liquid W
In the case of this embodiment, O is the water W filled in the liquid 11W10 up to the vicinity of the wind tunnel floor opening 11, and 10 to 30
A viscous liquid O such as silicone oil having a viscosity (approximately 1 million centistokes) suspended in a layer with a thickness of about a millimeter is used, but it can also be carried out using only a viscous liquid O such as silicone oil. The power meter movable support device 2O also has the structure of the previous embodiment (but is not limited to the above example). Instead of each, the design can be changed in various ways, such as by adopting a rotary operation mechanism that is manually operated from the outside of the liquid tank 1o using a rotary handle or the like.Reference numeral 64 shown in FIGS. 4 and 5 .65 is a vertically and horizontally long tank monitoring window with transparent viewing plates 64a and 65a attached to maintain watertightness, and the vertical movement scale plate 67 of the RVt index finger 1 [66] can be seen through both monitoring windows is attached to the back of the monitoring window in the liquid tank 10, and an arc-shaped tilt angle scale plate 68 of the tilting table 27, which can be seen through the horizontally long monitoring window 65, is mounted on the back side of the monitoring window in the liquid tank 10.
It is mounted on the movable table 25 inside 0.

〔Effect of the invention〕

As mentioned above, the layer temperature test device for ships and marine 4M structures of the present invention has a liquid if
A force meter is located in this liquid tank to attach the model for wind tunnel testing in a state protruding into the wind tunnel, and the force meter is installed so that the model can be moved to any test posture. is supported by a movable support device installed in the liquid tank,
Since the liquid 4a is filled with a liquid that does not cause M-plane deformation or liquid scattering due to wind tunnel circulation wind to the level where the tunnel floor opening is blocked, the wind tunnel test model can be placed in any test posture. Furthermore, even if the wind tunnel floor is provided with a large opening for varying the model posture, turbulence, vortices, etc. do not occur in the wind flowing through the wind tunnel, and accurate measurements can be carried out.

[Brief explanation of the drawing]

1 and 2 are sectional views schematically showing main parts of a conventional wind tunnel test apparatus, and FIG. 3 is a sectional view schematically showing main parts of a wind tunnel test apparatus according to an embodiment of the present invention. Figure 4 is a front view showing details of the wind tunnel test equipment, and Figure 5 is A- in Figure 4.
6 is a plan view of FIG. 4, FIG. 7 is a cross-sectional view of main parts of the tilting table tilting grip, and FIG. 8 is a rotating table rotation 8.
9 is a sectional view taken along the line B-B in FIG. 8, and FIG. 10 is a sectional plan view of the main part showing the rear side of the rotary table rotation mechanism. , Figure 11 is the 10th
It is a sectional view taken along the line C-C in the figure. DESCRIPTION OF SYMBOLS 1... Wind tunnel floor, 10... Liquid Iff, 11... Layer hotbed opening, 12... Power meter, 14... Model for wind tunnel test, 20... Power meter movable support Device, 21... Vertical support screw shaft, 22... Lifting platform, 23... Double rail,
24... Screw shaft for horizontal movement, 25... Front-back moving table, 26... Rotating shaft serving as a tilting fulcrum of the tilting table, 27.
...Tilt table, 27a...Tilt fulcrum bearing, 28...Rotary table rotation center axis, 29...Rotary table, 31...Chain sprocket, 33...Chain, 34...Elevating motor , 35... Back-and-forth motion motor, 35a... Reduction gear machine 1fL35b... Vertical spline shaft in tank,
3G...Tilt motor, 36a...Reduction gear (number of structures, 36b...Vertical spline shaft in tank, 37...Tilt configuration, 38...Spline shaft, 40...Spline connection) Combined, 39.712...Bevel gear, 41...Bevel gear mounting shaft, 43...Universal joint, 44.
・Threaded rod, 46 ・Piece to Nara 1, 49 ・Rotating table rotation mechanism, 50 ・Turning motor, 50a ・Reduction gear separate tank, 50b ・Spline shaft vertically in the tank , 51
... Spline shaft, 53 ... Spline engagement body, 5
2,55...Bevel gear, 58...Shirt l-156,
59...Bevel gear, 60...Worm, 61...Worm wheel, 62...Control operation type. Applicant's agent Patent attorney Takehiko Suzue Figure 4 A] Figure 5 Figure 6) Figure 7 Figure 8 To the coin Figure 9 Figure 8 Figure 10

Claims (1)

[Claims] (1) A liquid tank installed under the wind tunnel floor and having an opening on the side of the tunnel floor, and a model for wind tunnel testing located in the liquid tank and protruding from the upper part into the wind tunnel. The test needle is equipped with a power test needle to be attached, and a power test needle movable support device that supports the power test needle in a liquid tank so that the model can be moved to an arbitrary wind tunnel test posture, and a power test needle movable support device that supports the power test needle in a liquid tank is provided. A wind tunnel test posture for ships and marine structures, characterized in that the wind tunnel test is performed by filling the wind tunnel floor with liquid that does not cause liquid surface deformation or liquid scattering to the level where the wind tunnel floor opening is blocked. (2) The filling liquid in the 'a tank is water that has been filled into the tank up to the vicinity of the wind tunnel floor opening, and silicone oil that has been floated in a layer on the water surface and filled to the level where the tunnel floor opening is blocked. (3) as set forth in claim 1, characterized in that a viscous liquid such as silicone oil is used as the filling liquid in the liquid 42 to a level that blocks the opening of the wind tunnel floor. A wind tunnel testing device for ships and marine structures according to claim 1, characterized in that only a wind tunnel test device is used. (4) The movable support device for the force test h1 includes a lift table that supports the force test needle of several dimensions (f) in a vertically movable, horizontally movable, tiltable and rotatable manner, a backward moving table, a tilting table, and a A wind tunnel testing device for ships and structures as claimed in claim 1, characterized in that it is configured to include a rotating table.