Measurement device and wind tunnel test device using the same

Abstract

A measuring device according to the present invention is for a vehicle arranged downstream of air blown from a blower for a wind tunnel test, the measuring device comprising: a measuring device main body configured to enable the arrangement of the vehicle and movement thereof relative to the blower; and a splitter connected to an end of the measuring device main body facing the blower side, wherein the splitter has: a main body portion having an upper surface continuous with the upper surface of the measuring device main body and a lower surface having a surface extending downward as the distance from the blower side increases; and a plate-shaped tip member extending from the tip of the main body portion toward the blower side, the upper surface of the tip member is formed to be continuous with the upper surface of the main body portion, an edge of the lower surface of the tip member on the blower side is positioned closer to the main body portion than an edge of the upper surface of the tip member on the blower side, and a tip surface connecting the edge of the upper surface and the edge of the lower surface is formed to have an arcuate cross-section.

Description

[Technical Field]

[0001] The present invention relates to a vehicle measurement device that is placed downstream of air blown from a blower for wind tunnel testing, and to a wind tunnel testing device using the same. [Background technology]

[0002] Various wind tunnel testing devices have been proposed for conducting wind tunnel testing of vehicles. For example, the wind tunnel testing device described in Patent Document 1 is a stationary type that is installed inside a designated facility. This wind tunnel testing device also includes a suction device to suck in the boundary layer generated by friction between the airflow and the floor surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-47086 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the wind tunnel testing device is installed in a designated facility, it cannot be moved outside the facility. In addition, since suction equipment is required to suction the boundary layer, the device becomes large.

[0005] The present invention has been made to solve the above problems, and aims to provide a measurement device for wind tunnel testing and a wind tunnel testing device that are portable and can reduce the effects of the boundary layer. [Means for solving the problem]

[0006] The measuring device of the present invention is a measuring device for a vehicle that is placed downstream of air blown from a blower for wind tunnel testing, and comprises: a measuring device main body that is configured to be able to place the vehicle and to be movable relative to the blower; and a splitter that is connected to the end of the measuring device main body that faces the blower, and the splitter has a main body that has an upper surface that is continuous with the upper surface of the measuring device main body and a lower surface that has a surface that extends downward as it moves away from the blower side, and a plate-shaped tip member that extends from the tip of the main body toward the blower, and is formed so that the upper surface of the tip member and the upper surface of the main body are continuous, the blower-side edge of the lower surface of the tip member is located closer to the main body than the blower-side edge of the upper surface of the tip member, and the tip surface that connects the edge of the upper surface and the edge of the lower surface is formed in an arc-shaped cross section.

[0007] In the measuring device, the length of the tip member protruding from the main body can be set to 75 to 150 mm, and the thickness of the tip member can be set to 1 to 8 mm.

[0008] In the above measuring device, the tip radius of the tip surface can be set to 2 / 5 to 3 / 5 mm of the thickness of the tip member.

[0009] In the above-described measuring device, the measuring device main body can be configured by connecting a plurality of measuring modules, each housing at least one load cell.

[0010] The above-mentioned measuring device comprises a plurality of measuring modules, each housing at least one load cell, and at least one connecting module, and the measuring device main body can be constructed by using at least one of a first connecting mode in which the plurality of measuring modules are connected to each other, and a second connecting mode in which the plurality of measuring modules are connected to each other via the connecting module.

[0011] In the above-mentioned measuring device, each of the measuring modules comprises a flat lid body that supports the wheel of the vehicle and a moving mechanism that can change the position of the load cell below the lid body, and the lid body supports the wheel and comprises a disk-shaped wheel support member that is fixed to the load cell, a disk-shaped first positioning member that has a first through hole into which the wheel support member is fitted, a disk-shaped second positioning member that has a second through hole into which the first positioning member is rotatably fitted, and a support main body that has a third through hole into which the second positioning member is rotatably fitted, and by rotating the first and second positioning members, the wheel support member can be positioned directly below the wheel, and the load cell can be configured to measure the force acting on the wheel support member.

[0012] A wind tunnel testing device according to the present invention includes any one of the measuring devices described above and a movable blower. [Effects of the Invention]

[0013] The present invention is portable and can reduce the effects of the boundary layer. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic side view of a wind tunnel testing device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of a measuring device included in the wind tunnel testing device of FIG. 1. [Figure 3] 3 is a perspective view showing the measuring device of FIG. 2 with the cover removed. FIG. [Figure 4] FIG. 2 is a perspective view of a splitter of the measurement device. [Figure 5] FIG. 5 is a cross-sectional view of FIG. [Figure 6] 1A is a perspective view of a first measuring unit of the measuring device, and FIG. 1B is a partial cross-sectional view thereof. [Figure 7] FIG. 2 is a perspective view showing a state in which the cover body is removed from the first measurement unit. [Figure 8] FIG. 8 is a plan view of FIG. [Figure 9] FIG. 2 is a perspective view of the middle part of the measuring device. [Figure 10] FIG. 10 is a perspective view of the connecting portion with the intermediate cover removed. [Figure 11] FIG. 2 is a perspective view of the rear part of the measurement device. [Figure 12] FIG. 2 is a perspective view of the rear section with the rear section cover removed. [Figure 13] FIG. [Figure 14] FIG. 10 is a plan view showing another layout of the measurement device. [Figure 15] FIG. 10 is a plan view showing another layout of the measurement device. [Figure 16] FIG. 10 is a cross-sectional view showing another example of the main body of the splitter. [Figure 17] FIG. 10 is a plan view showing another example of the tip member of the splitter. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of a measurement device for wind tunnel testing according to the present invention will now be described with reference to the drawings, in which: Figure 1 is a schematic side view of the wind tunnel testing device;

[0016] As shown in Figure 1, this wind tunnel testing device includes a blower 1 and a measuring device 2, and is configured to blow air from the blower 1 to a four-wheeled vehicle 100 placed on the measuring device 2. The measuring device measures the drag and other factors acting on the vehicle receiving the blown air. The blower is a known portable blower for wind tunnel testing. The measuring device will be described in detail below.

[0017] Fig. 2 is a perspective view of the measuring device, and Fig. 3 is a perspective view showing the measuring device in Fig. 2 with the cover removed. For convenience of explanation, the following description will be given according to the directions shown in Fig. 2.

[0018] 2 and 3, the measurement device 2 comprises a splitter 3, a first measurement section 4, an intermediate section 5, a second measurement section 6, and a rear section 7, which are connected in this order from the front end to the rear end. Note that in the measurement device 2, the sections other than the splitter 3 correspond to the measurement device main body in the present invention. These components will be described in detail below.

[0019] <1. Splitter> FIG. 4 is a perspective view of the splitter, and FIG. 5 is a cross-sectional view of FIG. 4. As shown in FIGS. 4 and 5, the splitter 3 functions to thin the boundary layer formed on the upper surface of the measuring device 2 when the airflow from the blower 1 flows over the measuring device 2. The splitter 3 is composed of four splitter pieces 301-304 aligned in the left-right direction. Since each of the splitter pieces 301-304 has the same configuration, only one of them, the first splitter piece 301, will be described here. The first splitter piece 301 includes a main body 31 and a tip member 32 extending from the tip of the main body 31. The main body 31 has a plate-shaped upper wall 311 and a lower wall 312. The upper surface of the upper wall 311 is flat and continuous with the upper surface of the first measuring unit 4. The lower wall 312 has an inclined surface that extends downward toward the rear. Therefore, the upper wall portion 311 and the lower wall portion 312 are connected to each other so as to form an acute angle in a side view.

[0020] The tip member 32 is formed in a plate shape, and an upper surface 321 thereof is formed so as to be continuous with the upper surface of the main body 31. The front edge of the lower surface 322 of the tip member 32 is located further rearward than the front edge of the upper surface. A tip surface 323 connecting the edge of the upper surface 321 and the edge of the lower surface 322 is formed in an arc-shaped cross section.

[0021] A plurality of through holes 324 are formed in the tip member 32 at predetermined intervals in the front-rear direction. A pipe member 325 that communicates with the through holes 324 is attached to the lower surface 322 of the tip member 32. The pipe member 325 is connected to a pressure measuring unit (not shown) built into the measuring device 2, and is capable of measuring the pressure of air flowing over the upper surface of the tip member.

[0022] A boundary layer is formed on the top surface of the measurement device 2 by dragging a portion of the airflow from the blower 1 due to frictional forces generated between the measurement device 2 and the blower 1. Here, the component of the airflow excluding the boundary layer is referred to as the mainstream. That is, the airflow includes a boundary layer and a mainstream flow moving away from the top surface. The mainstream flow has a uniform flow velocity distribution in the height direction relative to the top surface. On the other hand, the flow velocity of the boundary layer is smaller than that of the mainstream flow and decreases as the flow approaches the top surface. This may affect the reproducibility of vehicle running conditions in wind tunnel tests. Therefore, in this embodiment, a splitter 3 is provided at the tip of the measurement device 2 to thin the boundary layer. As a result, the influence of the boundary layer on wind tunnel tests can be reduced.

[0023] The inventors have confirmed that the thickness t of the tip member 32, the length L of the tip member 32 protruding forward from the main body 31, and the radius of curvature R of the tip surface 323 have an effect on thinning the boundary layer and reducing its influence. For example, the thickness t of the tip member 32 is preferably 1 to 8 mm, and more preferably 3 to 5 mm. The length L of the tip member 32 protruding from the main body 31 is preferably 75 to 150 mm, and more preferably 100 to 125 mm. Furthermore, the tip radius R of the tip surface 323 is preferably 2 / 5 to 3 / 5 of the thickness of the tip member 32, and more preferably, for example, 1 / 2.

[0024] The four splitter pieces 301 to 304 are connected so as to be aligned in the left-right direction as described above. Of the four splitter pieces 301 to 304, the first and fourth splitter pieces 301, 304 arranged on the right and left sides have side openings formed by the upper wall portion 311 and the lower wall portion 312 and closed by plate-shaped side wall portion 315.

[0025] <2. First measuring unit and second measuring unit> 2 and 3, the first measurement unit 4 and the second measurement unit 6 are each configured by connecting two measurement modules having the same configuration in the left-right direction (first connection mode). For ease of explanation, the measurement modules on the right and left sides of the first measurement unit 4 will be referred to as the first and second measurement modules 401 and 402, respectively. Furthermore, the measurement modules on the right and left sides of the second measurement unit 6 will be referred to as the third and fourth measurement modules 601 and 602, respectively. Because the first to fourth measurement modules 401, 402, 601, and 602 have the same configuration, the following description will mainly focus on the first measurement unit 4 and the first measurement module 401.

[0026] FIG. 6 is a perspective view and partial cross-sectional view of the first measurement unit, FIG. 7 is a perspective view showing the first measurement unit with the lid removed, and FIG. 8 is a plan view of FIG. 7. As shown in FIGS. 6 to 8, the first measurement module 401 includes a plate-like bottom wall 41 that is square in plan view, a frame-shaped side frame 42 that is arranged along the periphery of the bottom wall 41, and a lid 43 that is square in plan view and closes the upper opening of the side frame 42, and is formed into a low rectangular parallelepiped shape overall. As shown in FIG. 7, the first and second measurement modules 401, 402 are fixed by connecting the side frames 42 together with bolts or the like. A load cell 44 and its movement mechanism 45 are disposed in the space surrounded by the bottom wall 41, the side frame 42, and the lid 43.

[0027] The movement mechanism 45 is configured as follows. As shown in Fig. 8, a pair of first rails 451 extending parallel to each other in the front-rear direction are arranged on the bottom wall portion 41. A plate-shaped first moving member 452 is provided on the first rails 451 and is movable in the front-rear direction along the first rails 451. A pair of second rails 453 extending parallel to each other in the left-right direction are arranged on the first moving member 452. A plate-shaped second moving member 454 is provided on the second rails 453 and is movable in the left-right direction along the second rails 453. The load cell 44 is arranged on the second moving member 454.

[0028] A known load cell can be used as the load cell 44. This load cell 44 is fixed to a wheel support member 431 of the cover body 43, which will be described next, and detects at least one of drag, lift, lateral force, and each moment that occurs on the vehicle via the vehicle wheels supported by the wheel support member 431. Each load cell 44 is connected to measuring instruments (not shown) housed in first and sixth rear modules 701, 706 of the rear section 7, which will be described later. The measuring instruments house strain amplifiers and load cell indicators.

[0029] Next, the cover 43 will be described. As shown in FIG. 6, the cover 43 has a wheel support member 431 that supports the wheel 101 of the vehicle 100. The wheel support member 431 is fixed to the upper surface of the load cell 44 with bolts or the like. A first positioning member 432, a second positioning member 433, and a support main body member 434 are arranged around the wheel support member 431. More specifically, the first positioning member 432 has a first through hole 4320 formed in a disk shape and into which the wheel support member is rotatably fitted. The first through hole 4320 is formed at a position offset from the center of the first positioning member 432. The second positioning member 433 has a disk shape and has a second through hole 4330 into which the first positioning member 432 is rotatably fitted. A step 4330 is formed on the inner circumferential surface of the second through hole 4330, and the first positioning member 432 is rotatably arranged on the step 4330. Additionally, the second through hole 4330 is formed at a position offset from the center of the second positioning member 433. The support main body member 434 is formed with a square outer shape so as to be placed on the side frame 42, and a circular third through hole 4340 is formed so as to coincide with the center of the square. A step 4340 is formed on the inner circumferential surface of this third through hole 4340, and the second positioning member 433 is rotatably disposed on this step 4340.

[0030] With this configuration, by rotating the first positioning member 432 and the second positioning member 433, the wheel support member 431 can be positioned at a desired position on the cover body 43. Specifically, for example, the wheel support member 431 can be positioned as follows.

[0031] First, with the first positioning member 432 removed, the load cell 44 and wheel support member 431 are moved to predetermined positions by the movement mechanism 45. At this time, if the second positioning member 433 interferes with the wheel support member 431, the second positioning member 433 is also removed. Next, an annular jig is attached around the wheel support member 431, and the second positioning member 433 is rotated to bring one of the inner peripheries of the second positioning member 433 into contact with the jig. As a result, the jig determines the closest distance between the outer circumferential surface of the wheel support member 431 and the inner circumferential surface of the second positioning member 433. This distance coincides with the closest distance between the outer circumferential surface of the first positioning member 432 and the inner circumferential surface of the first through-hole 4320. As a result, the space formed between the wheel support member 431 and the second through hole 4330 matches the shape of the first positioning member 432, so that by fitting the first positioning member 432 into the second through hole 4330, the positioning of the wheel support member 431 is completed.

[0032] Furthermore, if multiple holes are formed on the surfaces of the first and second positioning members 432, 433, levers can be inserted into these holes and then moved to move the positioning members 432, 433.

[0033] <3. Middle section> FIG. 9 is a perspective view of the intermediate section, and FIG. 10 is a perspective view of the intermediate section of the connecting section with the cover removed. As shown in FIGS. 9 and 10, the intermediate section 5 includes first to sixth intermediate modules 501 to 506 arranged from left to right. Of these, the first, third, fourth, and sixth intermediate modules 501, 503, 504, and 506 are formed of modules having the same rectangular shape in a plan view. Hereinafter, these modules will be referred to as A-type connecting modules 51. Furthermore, the second and fifth connecting modules 502 and 505 are formed of modules having the same square shape in a plan view. Hereinafter, these modules will be referred to as B-type connecting modules 52. The A-type connecting module 51 and the B-type connecting module 52 have the same length and height in the front-rear direction, but the B-type connecting module 52 is longer in the left-right direction than the A-type connecting module 51.

[0034] The A-type connection module 51 is formed in the shape of a rectangular parallelepiped that is long in the front-to-rear direction, and includes a plate-like bottom wall portion 511 that is rectangular in plan view, frame-shaped side frames 512 that are arranged along the periphery of the bottom wall portion 511, and a lid body 513 that is square in plan view and closes the upper opening of the side frame 512, and is formed in the shape of a low rectangular parallelepiped overall. Of the A-type connection module 51, the first and sixth intermediate modules 501 and 506 that are arranged on both sides of the intermediate section 5 have rectangular closure plates 514 attached to the right and left sides of the side frames 512, respectively.

[0035] The B-type connection module 52 includes a plate-like bottom wall portion 521 that is rectangular in plan view, a frame-shaped side frame 522 that is arranged along the periphery of the bottom wall portion 521, and a lid body 523 that is square in plan view and closes the upper opening of the side frame 522, and is formed into a low rectangular parallelepiped shape overall. Of the B-type connection module 52, the first and sixth intermediate modules 501 and 506 that are arranged on both sides of the intermediate section 5 have rectangular closing plates 524 attached to the right and left sides of the side frames 522, respectively.

[0036] As shown in FIG. 2, the total width of the two A-type connecting modules 51 and one B-type connecting module 52 in the left-right direction is the same as the width of one of the measurement modules 401, 402, 601, 602 in the left-right direction.

[0037] The intermediate section 5 is constructed by using four A-type connection modules and two B-type connection modules, which are connected in the left-right direction as described above. Adjacent modules are connected by connecting the side frames 512, 522 together and then fastening them with bolts or the like. The first and second measuring sections 4, 6 are also connected by connecting the side frames together and then fastening them with bolts or the like (second connection mode).

[0038] <4. Rear section> FIG. 11 is a perspective view of the rear section, and FIG. 12 is a perspective view of the rear section with the cover removed. As shown in FIGS. 11 and 12, the rear section 7 includes first to sixth rear modules 701 to 706 arranged from left to right. Of these, the first and sixth rear modules 701 and 706 are formed of modules having the same rectangular shape in a plan view. Hereinafter, these modules will be referred to as a C-type connection module 71. The third and fourth rear modules 703 and 704 are formed of modules having the same rectangular shape in a plan view but with a longer front-to-rear length than the first and sixth rear modules 701 and 706. Hereinafter, these modules will be referred to as a D-type connection module 72. Furthermore, the second and fifth rear modules 702 and 705 are formed of modules having a rectangular shape in a plan view but with a longer left-to-right width than the third and fourth rear modules 703 and 704. Hereinafter, these modules will be referred to as an E-type connection module 73.

[0039] The C-type connection module 71 is formed in the shape of a rectangular parallelepiped that is long in the front-to-rear direction, and includes a plate-like bottom wall portion 711 that is rectangular in plan view, frame-shaped side frames 712 that are arranged along the periphery of the bottom wall portion 711, and a lid body 713 that is rectangular in plan view and covers the upper opening of the side frame 712, and is formed in the shape of a low rectangular parallelepiped overall. The lid body 713 extends further rearward than the side frames 712, and has the same length in the front-to-rear direction as the D-type connection module 72. In addition, rectangular closure plates 714 are attached to the right and left sides of the side frames 712 of the C-type connection module 71.

[0040] The D-shaped connecting module 72 comprises a plate-shaped bottom wall portion 721 that is rectangular in plan view, a frame-shaped side frame 722 that is arranged along the periphery of the bottom wall portion 721, and a lid body 723 that is rectangular in plan view and covers the upper opening of the side frame 722, and is formed as a low rectangular parallelepiped overall.

[0041] The E-type connecting module 73 comprises a plate-shaped bottom wall portion 731 that is rectangular in plan view, a frame-shaped side frame 732 that is arranged along the periphery of the bottom wall portion 731, and a lid body 733 that is rectangular in plan view and covers the upper opening of the side frame 732, and is formed as a low rectangular parallelepiped overall.

[0042] As shown in FIG. 2, the total width of one C-type connecting module 71, D-type connecting module 72, and E-type connecting module 73 in the left-right direction is the same as the width of one measurement module 401, 402, 601, 602 in the left-right direction.

[0043] The rear section 7 is configured by using two C-type, D-type, and E-type connection modules, which are connected in the left-right direction as described above. Adjacent modules are connected by connecting the side frames 712, 722, and 732 together and then fastening them with bolts or the like. Connection to the second measurement unit 6 is also achieved by connecting the side frames together and then fastening them with bolts or the like. The C-type connection modules constituting the first and sixth rear modules 701 and 706 house the measuring instruments described above. The measuring instruments are connected to an external computer via cables for data display, analysis, and the like. Because the measuring instruments are connected to cables in this way, the C-type connection module 71 is shorter than the adjacent E-type connection module 73 for ease of handling. For example, if a cable needs to be extended in the left-right direction, the bent portion of the cable can be placed in an area covered by the cover 713 of the C-type connection module 71. This prevents the bent portion of the cable from being exposed.

[0044] <5. Wind tunnel testing> Next, a wind tunnel test using the measurement device configured as described above will be described. First, the measurement device 2 is assembled as described above. Next, the load cell 44 and the wheel support member 431 are placed at positions corresponding to the four wheels 101 of the vehicle 100. First, the load cell 44 is positioned by the movement mechanism 45, and then the first and second positioning members 432, 433 are manually rotated so that the wheel support member 431 is positioned directly above the load cell 44. At this time, the positions of each load cell 44 are input into a computer connected to the measuring instrument.

[0045] Next, as shown in Fig. 13, the vehicle is placed on the measuring device 2. The position of the vehicle is adjusted so that the four wheels 101 are positioned on the four wheel support members 431. Once the vehicle is placed in this manner, air is blown by the blower 1, and the various data described above are measured by the load cell 44.

[0046] <6. Features> The measuring device 2 configured as above can provide the following effects. (1) The blower 1 and the measuring device 2 are configured to be separate and movable, and the measuring device 2 can be assembled. Therefore, wind tunnel testing can be performed at any desired location, compared to conventional stationary wind tunnel testing equipment that cannot be moved.

[0047] (2) Conventional stationary wind tunnel testing equipment is equipped with a suction device that sucks in the boundary layer, making the equipment complex and large. However, the measuring device 2 of this embodiment is equipped with a splitter 3 with a simple configuration at the tip, which makes it possible to thin the boundary layer and reduce its impact. This makes the measuring device suitable for portable use and simplifies the device.

[0048] (3) The measurement device 2 is configured by combining one type of measurement module 401 and five types of linkage modules 51, 52, 71 to 73. Therefore, by appropriately combining these modules, it can be applied to wind tunnel tests of vehicles with different numbers and positions of wheels 101. For example, while the above description has been directed to wind tunnel tests of four-wheeled vehicles, for example, by linking a splitter 3 composed of two splitter pieces 301, 302 with two measurement modules 401 as shown in FIG. 14, wind tunnel tests of two-wheeled vehicles such as bicycles and motorcycles can be performed. Furthermore, as shown in FIG. 15, wind tunnel tests of small four-wheeled vehicles can be performed by linking four measurement modules 401, an A-type linkage module 51, and a B-type linkage module 52. In other words, it is not necessary to use all types of linkage modules; any of them can be used to configure the measurement device. Wind tunnel tests of tricycles and other three-wheeled vehicles can also be performed. Furthermore, because each module can be separably linked, measurement devices compatible with multiple types of vehicles can be configured multiple times.

[0049] (4) In the measurement device 2 according to this embodiment, compared to measurements of various vehicles using a single measurement device such as a conventional wind tunnel balance, the measurement device 2 can be made smaller because multiple load cells 44 are used in accordance with the positions of the wheels 101. Furthermore, since a load cell 44 is provided for each wheel, measurement responsiveness can be improved. Furthermore, the movement mechanisms 45 of the measurement modules 401, 402, 601, and 602 can accurately position the load cells 44. Furthermore, even if the position of the wheel support member 431 is changed, the top surfaces of the lids 43 remain flat. This combination allows accurate measurement of the force applied to the wheels 101. In particular, when calculating the moment applied to the vehicle body, the wheel pitch (e.g., the dimensions of the wheelbase and tread base) must be used for the calculation. Therefore, the load cells 44 must be accurately positioned at the positions of the wheels 101. Therefore, the measurement device 2 according to this embodiment is preferable. Furthermore, by providing a load cell 44 for each wheel 101, the thickness of the measurement modules 401, 402, 601, and 602 can be reduced. Therefore, it is possible to realize a measurement device 2 that is highly portable.

[0050] <7. Variations> Although the first embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications are possible without departing from the spirit of the present invention. The following modifications can be combined as appropriate.

[0051] (1) The shape of the splitter 3 is not particularly limited and can be various shapes. For example, as shown in Fig. 16(a), the cross-sectional shape of the inclined surface of the lower wall portion 312 of the main body portion 31 can be a curved shape that is convex downward. Alternatively, as shown in Fig. 16(b), the cross-sectional shape of the inclined surface of the lower wall portion 312 of the main body portion 31 can be a curved shape that is convex upward.

[0052] The planar shape of the tip member 32 can also be various shapes other than rectangular. For example, in FIG. 17(a), the left and right corners are formed in an arc shape. In FIG. 17(b), the left and right corners are chamfered. In FIG. 17(c), the tip is formed in a mountain shape with the center of the tip protruding. In FIG. 17(d), the tip is formed in a wave shape. In FIG. 17(e), multiple mountain-shaped protrusions are formed at the tip. Furthermore, the position and number of through holes for measuring the pressure on the top surface of the splitter 3 are not particularly limited and can be provided as appropriate.

[0053] (2) In the above embodiment, the measurement device is configured using one type of measurement module and five types of connection modules, but these are merely examples and are not limiting. That is, it is sufficient that the measurement device be configured using at least one of a first connection mode in which multiple measurement modules are connected to each other and a second connection mode in which multiple measurement modules are connected to each other via a connection module. Therefore, it is possible to prepare measurement modules and connection modules with even different shapes, which makes it possible to apply the device to wind tunnel tests of various vehicles with different numbers and positions of wheels.

[0054] (3) The configuration of the measurement module is not particularly limited, as long as at least one load cell 44 is disposed therein. Furthermore, unlike the above embodiment, in which the positions of the load cell 44 and the wheel support member 431 can be changed, the measurement module may have these positions fixed. Even when such a measurement module is used, the positions between the measurement modules can be adjusted by using a connecting module, so that the load cell can be disposed at the wheel position. Furthermore, multiple load cells can be disposed in one measurement module. Furthermore, the shape of the measurement module is not particularly limited, and in addition to the rectangular shape in plan view described above, various shapes such as a polygonal shape can be used.

[0055] (4) In the above embodiment, the load cell 44 is moved in two directions perpendicular to each other on a horizontal plane by the first rail 451 and the second rail 453. However, the configuration of the movement mechanism 45 for the load cell 44 is not limited to this. In other words, it is sufficient that the load cell 44 is configured to be movable within the measurement module 401. For example, a plurality of holes can be formed at predetermined intervals in the bottom wall 41, and the load cell 44 can be positioned at any position on the bottom wall 41, and then the load cell can be fixed by inserting bolts or the like into the holes.

[0056] (5) In the above embodiment, the wheel support member 431 is moved by two positioning members 432, 433, but the movement mechanism (second movement mechanism) configured to position the wheel support member 431 at any position on the lid body 43 is not limited to this. In other words, other configurations may be used as long as the wheel support member 431 can be moved within the lid body 43 while the upper surface of the lid body 43 remains flat. For example, in the above embodiment, the wheel support member 431 is moved by two positioning members 432, 433, but three or more disk-shaped positioning members may be used. Alternatively, one disk-shaped positioning member may be used.

[0057] Furthermore, the first positioning member 432 and the second positioning member 433 may be configured to rotate in conjunction with the movement of the wheel support member 431 together with the load cell 44. In this case, the rotation of the first positioning member 432 and the second positioning member 433 may be assisted by a motor or the like. Furthermore, the first positioning member 432 and the second positioning member 433 may be configured to be fixed so as not to move after the wheel support member 431 has been positioned.

[0058] Alternatively, wheel support member 431 may be formed in a rectangular shape, and a plurality of subdivided insert-type blocks each having a rectangular shape in plan view may be inserted around the wheel support member 431 to form lid body 43. This allows wheel support member 41 to move within lid body 43 while keeping the top surface of lid body 43 flat. Alternatively, instead of blocks, the wheel support member 431 may be surrounded by shutters that can move back and forth and left and right.

[0059] (6) In the measurement module, the first and second positioning members 432, 433 are rotated manually, but each of the positioning members 432, 433 can also be rotated by a driving device such as a motor. This allows the wheel support member to be positioned automatically. The same applies to the movement mechanism 45 that moves the load cell 44.

[0060] (7) In the above embodiment, the positions of the load cells 44 are measured by an operator and input into a computer, but this operation can also be performed automatically. That is, a detector that detects the positions of the load cells 44 can be provided. As a detector, for example, encoders can be provided on the movement mechanism 45, and the positions of the load cells 44 can be detected by these encoders. Also, the relative positional relationship between the load cells 44 can be measured, and the positions of the load cells 44 can be detected based on this. Also, various detectors other than encoders, such as potentiometers, resolvers, lasers, etc., can be used.

[0061] (8) The configuration of the connecting module is not particularly limited, as long as it is configured so that the upper surface of the connecting module can be connected to the measurement module so that the upper surface of the connecting module is continuous with the upper surface of the measurement module. In addition, the shape of the connecting module is not particularly limited, and it can be various shapes such as a polygonal shape in addition to the rectangular shape in a plan view as described above.

[0062] (9) The measuring device body may be an integrated type with a pre-fixed load cell instead of the assembled type as in the above embodiment. Also, instead of multiple load cells, a measuring device having a single measuring unit for wind tunnel testing may be used.

[0063] (10) There are no particular limitations on the configuration of the blower 1, and any known blower can be used. In consideration of portability, it is preferable to use a blower that can be combined with multiple blowers depending on the air volume. [Explanation of symbols]

[0064] 1 blower 2. Measuring equipment 3. Splitter 31 Main body 32 Tip member 4 Measurement Module 44 load cells 45 Moving mechanism 51,52 Connection module 71~73 Connecting Module

Claims

1. A measurement device for a vehicle that is arranged downstream of air blown from a blower for wind tunnel testing, a measuring device body configured to be able to place the vehicle and to be movable relative to the blower; a splitter connected to an end of the measuring device body facing the blower; Equipped with The splitter comprises: a main body portion including an upper surface continuous with an upper surface of the measuring device main body and a lower surface having a surface extending downward as it moves away from the blower side; a plate-shaped tip member extending from a tip of the main body portion toward the blower; and The upper surface of the tip member and the upper surface of the main body are formed so as to be continuous with each other, an edge of the lower surface of the tip member on the side of the blower is located closer to the main body than an edge of the upper surface of the tip member on the side of the blower, A measuring device, wherein a tip surface connecting the edge of the upper surface and the edge of the lower surface is formed to have an arc-shaped cross section.

2. The length of the tip member protruding from the main body is 75 to 150 mm, 2. The measuring device according to claim 1, wherein the tip member has a thickness of 1 to 8 mm.

3. 3. The measuring device according to claim 1, wherein the tip radius of the tip surface is 2 / 5 to 3 / 5 mm of the thickness of the tip member.

4. 4. The measuring device according to claim 1, wherein the measuring device main body is configured by connecting a plurality of measuring modules, each of which houses at least one load cell.

5. a plurality of measurement modules each containing at least one load cell; at least one linkage module; Equipped with The measuring device according to any one of claims 1 to 3, wherein the measuring device main body is configured by using at least one of a first connection mode in which the plurality of measuring modules are connected to each other, and a second connection mode in which the plurality of measuring modules are connected to each other via the connection module.

6. Each of the measurement modules comprises: a flat lid supporting the wheels of the vehicle; a movement mechanism that can change the position of the load cell below the lid; Equipped with The lid body is a disk-shaped wheel support member that supports the wheel and is fixed to the load cell; a first positioning member having a disk shape and a first through hole into which the wheel support member is fitted; a disk-shaped second positioning member having a second through hole into which the first positioning member is rotatably fitted; a support body portion having a third through hole into which the second positioning member is rotatably fitted; Equipped with By rotating the first and second positioning members, the wheel support member can be positioned directly below the wheel, 6. A measuring device according to claim 4 or 5, wherein the load cell is adapted to measure the force acting on the wheel support member.

7. A measuring device according to any one of claims 1 to 6; A portable fan; A wind tunnel testing device comprising:

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