Model attitude control device for water tunnel experiment

Abstract

The utility model relates to a model attitude control device for a water tunnel experiment, which belongs to the technical field of fluid mechanics experiment devices, is arranged on an experiment section of a water tunnel device, and comprises a connecting piece, a sleeve, a screw rod and a connecting rod, one end of the connecting piece abuts against the inner wall of the experiment section, and the other end is provided with a first hinge point; the outer wall of the sleeve is hinged to the connecting piece through a first hinge point. One end of the sleeve is provided with a mounting part for mounting a model, and the other end of the sleeve is of an open structure; the screw rod penetrates through the cover plate of the experiment section and is in sealed connection with the cover plate; the screw and the connecting piece are arranged in parallel, the screw is movably connected with the cover plate in the axis direction of the screw, and a second hinge point is arranged at the end, away from the cover plate, of the screw; one end of the connecting rod is sleeved in the sleeve, and the other end is hinged with the screw rod through a second hinge point. According to the device, the model posture can be adjusted through simple screw movement, the structure is simple, operation and maintenance are easy, and efficient and reliable model posture control can be provided in a water tunnel experiment.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid mechanics experimental devices, and in particular relates to a model posture control device used for water tunnel experiments. Background Art

[0002] The water tunnel device is a device used for fluid dynamics experiments, mainly used to study underwater propulsion, supercavitation, and underwater high-speed navigation fluid mechanics. During the experiment of the water tunnel device, it is necessary not only to conduct experimental research when the model is set parallel to the incoming flow direction, but also to conduct experimental research when the model is at different angles to the incoming flow direction.

[0003] In the prior art, Chinese invention patent CN112985760B provides a model angle controllable adjustment device for water tunnel test, including a water tunnel test section, a base for fixing and adjusting the model angle is provided on the water tunnel test section, a motion mechanism for adjusting the test model angle is provided on the base, and the motion mechanism includes a pitch motion mechanism and a yaw motion mechanism located above the base and a flip motion mechanism suspended at the lower end of the pitch motion mechanism; the device can be directly attached to the existing water tunnel device, and the motion of the test model in three degrees of freedom is controlled by a motion controller. However, the device provided by the patent is relatively complex, with high manufacturing and maintenance costs, and is not suitable for popularization and use.

[0004] Therefore, how to provide a model attitude control device for water tunnel experiments with a simple structure and low maintenance cost is a technical problem that urgently needs to be solved. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a model posture control device for water tunnel experiments, which can adjust the posture of the model through simple screw movement. It has a simple structure and is easy to operate and maintain, and can provide efficient and reliable model posture control in water tunnel experiments.

[0006] The utility model provides a model attitude control device for a water tunnel experiment, which is installed in an experimental section of a water tunnel device and comprises:

[0007] A connecting piece, one end of which abuts against the inner wall of the test section and the other end of which is provided with a first hinge point;

[0008] A sleeve, wherein the outer wall of the sleeve is hinged to the connecting member through a first hinge point; the interior of the sleeve is a hollow structure, one end of which is provided with a mounting portion for mounting the model so that the model rotates around the hinge point with the sleeve, and the other end is an open structure;

[0009] A screw rod is passed through the cover plate of the experimental section and is sealed with the cover plate; the screw rod is arranged in parallel with the connecting piece, the screw rod is movably connected with the cover plate along the axis direction of the screw rod, and a second hinge point is arranged at one end of the screw rod away from the cover plate;

[0010] A connecting rod, one end of which is sleeved inside the sleeve through the open structure of the sleeve and is slidably connected relative to the sleeve; the other end is hinged to the screw rod through a second hinge point; when the screw rod moves along the axial direction, the connecting rod rotates around the second hinge point and slides relative to the sleeve, while driving the sleeve and the model to rotate around the first hinge point;

[0011] The axes of the connector, sleeve, screw and connecting rod are all coplanar, and the planes where the axes of the connector, sleeve, screw and connecting rod are located are parallel to the flow direction of the fluid in the experimental section.

[0012] This technical solution can adjust the posture of the model through simple screw movement, has a simple structure, is easy to operate and maintain, and can provide efficient and reliable model posture control in water tunnel experiments.

[0013] In some embodiments, the model attitude control device for water tunnel experiments further includes a ruler for measuring the displacement of the screw, the ruler being fixed to the outside of the cover plate and arranged parallel to the screw. The technical solution facilitates the experimenter to read the data through the setting of the ruler, thereby ensuring the reliability of the experimental results.

[0014] In some embodiments, a pointer is fixed to the end of the screw away from the connecting rod, and the pointer points to the ruler to indicate the displacement of the screw to calculate the model pitch angle. This technical solution provides an intuitive and accurate screw displacement reading through the setting of the pointer, and the pointer and the ruler are used in conjunction, so that the calculation of the model pitch angle is more accurate.

[0015] In some embodiments, when the connecting rod is perpendicular to the screw rod, the pointer points to the 0 scale of the ruler. On the one hand, this technical solution facilitates the experimenter to observe and record the experimental data. On the other hand, the experimenter can calibrate the device by pointing the pointer to the 0 scale, so that the model can quickly return to the initial state, thereby improving the overall efficiency of the experiment.

[0016] In some of the embodiments, the model pitch angle is calculated using formula (1), and the expression of formula (1) is:

[0017]

[0018] In formula (1), θ is the pitch angle of the model; H1 is the vertical distance from the center of the first hinge point to the axis of the sleeve; H2 is the displacement of the screw; L is the vertical distance from the center of the first hinge point to the axis of the screw. This technical solution can accurately reflect the change of the pitch angle of the model and provide a reliable calculation basis for the control and adjustment of the model posture.

[0019] In some embodiments, a seal is provided at the connection between the screw and the cover plate. The technical solution effectively prevents leakage of the medium by providing the seal.

[0020] In some embodiments, a nut is provided at the connection between the screw and the cover plate, and the nut is fixed to the outside of the cover plate; when the nut is rotated, the screw produces axial movement relative to the nut. Through the setting of the nut, the experimenter can directly adjust the displacement of the screw by rotating the nut, thereby adjusting the model posture, providing a simple, effective and economical solution for adjusting the screw.

[0021] In some embodiments, the cover plate is fixedly connected to the experimental section by a fixing member. The technical solution ensures a stable connection between the cover plate experimental section by setting the fixing member.

[0022] In some embodiments, a through hole is provided at one end of the sleeve near the mounting member, and when the connecting rod slides relative to the sleeve, the fluid inside the sleeve flows in or out through the through hole. The technical solution adjusts the pressure inside the sleeve by providing the through hole, prevents the fluid from being accumulated inside the sleeve, and avoids unnecessary pressure changes.

[0023] In some embodiments, the mounting portion includes a threaded interface, and the sleeve is threadedly connected to the model. The technical solution facilitates the disassembly and assembly of the sleeve and the model through the threaded interface.

[0024] Based on the above scheme, the model attitude control device for water tunnel experiments in the embodiment of the utility model drives the connecting rod to rotate around the second hinge point through the axial direction movement of the screw, so that the sleeve and the model rotate around the first hinge point to achieve attitude control of the model; at the same time, the plane where the axis of the connecting piece, sleeve, screw, and connecting rod is located is parallel to the flow direction of the fluid in the experimental section. This layout helps to simulate the real fluid environment on the one hand, and on the other hand, it can reduce the unnecessary force generated when there is an angle between the model and the water flow direction, thereby improving the accuracy and reliability of the experiment. In summary, the model attitude control device for water tunnel experiments in this embodiment can adjust the attitude of the model through simple screw movement, has a simple structure, is easy to operate and maintain, and can provide efficient and reliable model attitude control in water tunnel experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0026] Figure 1 It is a structural schematic diagram of a model attitude control device for water tunnel experiments of the utility model;

[0027] Figure 2 This is a schematic diagram of the calculation process structure for controlling the model posture in Example 1 of the utility model.

[0028] In the figure:

[0029] 1. Cover plate; 2. Connector; 3. Sleeve; 4. Screw; 5. Connecting rod; 6. Model; 7. Ruler; 8. Seal; 9. Nut;

[0030] 301, through hole; 302, mounting portion; 401, pointer; 901, fixing part. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1-Figure 2As shown, in one embodiment of the model attitude control device for water tunnel experiment of the utility model, the model attitude control device for water tunnel experiment is installed in the experimental section of the water tunnel device, including a connecting member 2, a sleeve 3, a screw 4 and a connecting rod 5; wherein, one end of the connecting member 2 is against the inner wall of the experimental section, and the other end is provided with a first hinge point; the outer wall of the sleeve 3 is hinged to the connecting member 2 through the first hinge point; the interior of the sleeve 3 is a hollow structure, one end of which is provided with a mounting portion 302 for mounting a model 6, so that the model 6 rotates around the hinge point with the sleeve 3, and the other end is an open structure; the screw 4 is passed through the cover plate 1 of the experimental section and is sealed and connected to the cover plate 1; the screw 4 and the connecting member 2 are connected to the connecting member 2; ...; the screw 4 and the connecting member 2 are connected to the connecting member 2; the sleeve 3 is a hollow structure, one end of which is provided with a mounting portion 302 for mounting a model 6, so that the model 6 rotates around the hinge point with the sleeve 3, and the other end is an open structure; the screw 4 is passed through the cover plate 1 of the experimental section and is sealed and connected to the cover plate 1; the screw 4 and the connecting member 2 are connected to the connecting member 2; the sleeve 3 is a hollow structure, Part 2 is arranged in parallel, the screw 4 is movably connected with the cover plate 1 along the axial direction of the screw 4, and a second hinge point is provided at one end of the screw 4 away from the cover plate 1; one end of the connecting rod 5 is sleeved in the interior of the sleeve 3 through the open structure of the sleeve 3, and is slidably connected relative to the sleeve 3; the other end is hinged to the screw 4 through the second hinge point; when the screw 4 moves along the axial direction, the connecting rod 5 rotates around the second hinge point and slides relative to the sleeve 3, and at the same time drives the sleeve 3 and the model 6 to rotate around the first hinge point; the axes of the connecting part 2, sleeve 3, screw 4, and connecting rod 5 are all coplanar, and the plane where the axes of the connecting part 2, sleeve 3, screw 4, and connecting rod 5 are located is parallel to the flow direction of the fluid in the experimental section.

[0036] In the above-mentioned exemplary embodiment, the model posture control device for water tunnel experiment can drive the connecting rod 5 to rotate around the second hinge point through the axial direction movement of the screw 4, so that the sleeve 3 and the model 6 rotate around the first hinge point to achieve the posture control of the model 6; at the same time, the plane where the axis of the connecting member 2, the sleeve 3, the screw 4, and the connecting rod 5 is located is parallel to the flow direction of the fluid in the experimental section. This layout helps to simulate the real fluid environment on the one hand, and on the other hand, it can reduce the unnecessary force generated when the model 6 is at an angle with the water flow direction, thereby improving the accuracy and reliability of the experiment. In summary, the model posture control device for water tunnel experiment in this embodiment can adjust the posture of the model 6 through a simple movement of the screw 4, has a simple structure, is easy to operate and maintain, and can provide efficient and reliable model 6 posture control in the water tunnel experiment.

[0037] It should be noted that the cover plate 1 is sealed and connected to the experimental section.

[0038] In some embodiments, Figure 1 As shown, the model attitude control device for the water tunnel experiment also includes a scale 7 for measuring the displacement of the screw 4, which is fixed to the outside of the cover plate 1 and arranged parallel to the screw 4. The scale 7 provides accurate displacement data of the screw 4 to ensure the reliability of the experimental results; at the same time, the setting of the scale 7 can also facilitate the experimenter to monitor the displacement of the screw 4, making the reading of data more intuitive and convenient, without the need for complex measuring tools or procedures, and reducing the difficulty of operation.

[0039] Furthermore, if Figure 2 As shown, a pointer 401 is fixed to one end of the screw 4 away from the connecting rod 5, and the pointer 401 points to the ruler 7, which is used to indicate the displacement of the screw 4 to calculate the model pitch angle. Through the setting of the pointer 401, the pointer 401 is used in conjunction with the ruler 7 to provide an intuitive and accurate screw 4 displacement reading, so that the calculation of the model pitch angle is more accurate; at the same time, it is convenient for the experimenter to record the experimental data, analyze and manage the experimental data, and adjust the experimental process. Compared with electronic measuring equipment, the cost of the pointer 401 and the ruler 7 is low, and the maintenance is simple, which is conducive to reducing the experimental cost.

[0040] In some embodiments, Figure 2 As shown, when the connecting rod 5 is perpendicular to the screw rod 4, the pointer 401 points to the 0 scale of the ruler 7. When the connecting rod 5 is perpendicular to the screw rod 4, it is taken as the initial state of the experiment, and the 0 scale is taken as the standard reference point. When the pointer 401 points to the 0 scale, it is taken as the experimental state in which the displacement of the screw rod 4 is 0; through this setting, on the one hand, the experimenter can directly read the reading of the ruler 7 as the displacement of the screw rod 4, which is convenient for the experimenter to observe and record the experimental data; on the other hand, the experimenter can calibrate the device by pointing the pointer 401 to the 0 scale, so that the model 6 can quickly return to the initial state, thereby improving the overall efficiency of the experiment.

[0041] In some embodiments, Figure 2 As shown, the model pitch angle is calculated using formula (1), and the expression of formula (1) is:

[0042]

[0043] In formula (1), θ is the pitch angle of the model; H1 is the vertical distance from the center of the first hinge point to the axis of the sleeve 3; H2 is the displacement of the screw 4; L is the vertical distance from the center of the first hinge point to the axis of the screw 4. Regardless of the specific size of the model 6 or how the displacement of the screw 4 changes, formula (1) can accurately reflect the change of the model pitch angle, providing a reliable calculation basis for the control and adjustment of the posture of the model 6, which helps to improve the accuracy and efficiency of the experiment.

[0044] In some embodiments, Figure 1 As shown, a seal 8 is provided at the connection between the screw rod 4 and the cover plate 1. The seal 8 is provided to effectively prevent leakage of the medium and ensure the smooth progress of the water tunnel experiment.

[0045] In some embodiments, Figure 1As shown, a nut 9 is provided at the connection between the screw rod 4 and the cover plate 1, and the nut 9 is fixed to the outside of the cover plate 1; when the nut 9 is rotated, the screw rod 4 generates an axial movement relative to the nut 9. Through the setting of the nut 9, the experimenter can directly adjust the displacement of the screw rod 4 by rotating the nut 9, thereby adjusting the posture of the model 6, which provides a simple, effective and economical solution for adjusting the screw rod 4.

[0046] In some embodiments, Figure 1 As shown, the cover plate 1 is fixedly connected to the experimental section via a fixing member 901. The setting of the fixing member 901 ensures a stable connection between the experimental sections of the cover plate 1.

[0047] Furthermore, in this embodiment, the fixing member 901 includes a fixing plate and bolts for fixing the cover plate 1 , and the fixing plate and the cover plate 1 are firmly connected to the experimental section through the bolts.

[0048] In some embodiments, Figure 1 As shown, a through hole 301 is provided at one end of the sleeve 3 close to the mounting member, and when the connecting rod 5 slides relative to the sleeve 3, the fluid inside the sleeve 3 flows in or out through the through hole 301. The through hole 301 is provided to adjust the pressure inside the sleeve 3, prevent the fluid from being accumulated inside the sleeve 3, and avoid unnecessary pressure changes.

[0049] In some embodiments, Figure 1 As shown, the mounting portion 302 includes a threaded interface, and the sleeve 3 is threadedly connected to the model 6. The threaded interface facilitates the disassembly and assembly of the sleeve 3 and the model 6.

[0050] Example 1

[0051] Combine the following Figure 1-Figure 2 The specific structure and working process of an embodiment of the model posture control device for water tunnel experiment of the utility model are briefly described as follows:

[0052] (1) Replace cover 1

[0053] Before the water tunnel experiment began, Figure 1 As shown, the experimenter removed the original cover plate, replaced it with a cover plate 1 with a connector 2, a sleeve 3, a connecting rod 5 and a screw 4, and fixed the cover plate 1 to the experimental section by bolts. It should be noted that in this embodiment, the connector 2 and the screw 4 are both arranged perpendicular to the inner wall of the experimental section.

[0054] (2) Installation device

[0055] like Figure 1 As shown, the normal use of the first hinge point between the sleeve 3 and the connecting member 2 and the normal use of the second hinge point between the connecting rod 5 and the screw rod 4 are ensured; the seal 8, the nut 9 and the ruler 7 are installed respectively.

[0056] (3) Installation model

[0057] like Figure 1 As shown, the model 6 is connected to the sleeve 3 through the mounting portion 302 , and the angle of the model 6 is adjusted so that when the sleeve 3 is parallel to the inner wall of the test section, the pointer 401 at the end of the screw rod 4 points to the 0 scale of the ruler 7 .

[0058] (4) Start the experiment

[0059] like Figure 2 As shown, rotating the nut 9 causes the screw 4 to move up and down, driving the connecting rod 5 to rotate around the second hinge point. While the connecting rod 5 rotates, it slides relative to the sleeve 3, causing the model 6 to rotate around the first hinge point along with the sleeve 3. The experimenter obtains the model pitch angle according to the reading of the ruler 7 using formula (1), so as to rotate the nut 9 according to the experimental requirements and adjust the posture of the model 6. The expression of formula (1) is:

[0060]

[0061] In formula (1), θ is the pitch angle of the model; H1 is the vertical distance from the center of the first hinge point to the axis of the sleeve 3; H2 is the displacement of the screw 4; and L is the vertical distance from the center of the first hinge point to the axis of the screw 4.

[0062] Through the description of multiple embodiments of the model posture control device for water tunnel experiment of the utility model, it can be seen that the embodiment of the model posture control device for water tunnel experiment of the utility model has at least one or more of the following advantages:

[0063] 1. The model attitude control device for water tunnel experiment provided by the utility model drives the connecting rod 5 to rotate around the second hinge point through the axial direction movement of the screw rod 4, thereby causing the sleeve 3 and the model 6 to rotate around the first hinge point, thereby realizing the attitude control of the model 6;

[0064] 2. The model attitude control device for water tunnel experiment provided by the utility model provides accurate displacement data of the screw 4 through the scale 7 to ensure the reliability of the experimental results;

[0065] 3. The model attitude control device for water tunnel experiment provided by the utility model can accurately reflect the change of the model pitch angle through formula (1), provide a reliable calculation basis for the control and adjustment of the model 6 attitude, and help to improve the accuracy and efficiency of the experiment.

[0066] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A model attitude control device for a water tunnel experiment, installed in the experimental section of a water tunnel device, characterized in that: include: A connecting piece, one end of which abuts against the inner wall of the test section and the other end of which is provided with a first hinge point; A sleeve, wherein the outer wall of the sleeve is hinged to the connecting member through a first hinge point; the interior of the sleeve is a hollow structure, one end of which is provided with a mounting portion for mounting the model so that the model rotates around the hinge point with the sleeve, and the other end is an open structure; A screw rod is passed through the cover plate of the experimental section and is sealed with the cover plate; the screw rod is arranged in parallel with the connecting piece, the screw rod is movably connected with the cover plate along the axis direction of the screw rod, and a second hinge point is arranged at one end of the screw rod away from the cover plate; A connecting rod, one end of which is sleeved inside the sleeve through the open structure of the sleeve and is slidably connected relative to the sleeve; the other end is hinged to the screw rod through a second hinge point; when the screw rod moves along the axial direction, the connecting rod rotates around the second hinge point and slides relative to the sleeve, while driving the sleeve and the model to rotate around the first hinge point; The axes of the connector, sleeve, screw and connecting rod are all coplanar, and the planes where the axes of the connector, sleeve, screw and connecting rod are located are parallel to the flow direction of the fluid in the experimental section.

2. The model attitude control device for water tunnel experiment according to claim 1, characterized in that: The invention also comprises a scale for measuring the displacement of the screw rod, wherein the scale is fixed to the outer side of the cover plate and arranged parallel to the screw rod.

3. The model attitude control device for water tunnel experiment according to claim 2 is characterized in that: A pointer is fixed at one end of the screw rod away from the connecting rod. The pointer points to the scale and is used to indicate the displacement of the screw rod to calculate the pitch angle of the model.

4. The model attitude control device for water tunnel experiment according to claim 3 is characterized in that: When the connecting rod is perpendicular to the screw, the pointer points to the 0 mark on the scale.

5. The model attitude control device for water tunnel experiment according to claim 1, characterized in that: The cover plate is sealed and connected to the experimental section.

6. The model attitude control device for water tunnel experiment according to claim 1, characterized in that: A sealing member is provided at the connection between the screw rod and the cover plate.

7. The model attitude control device for water tunnel experiment according to claim 1, characterized in that: A nut is provided at the connection between the screw rod and the cover plate, and the nut is fixed to the outer side of the cover plate; when the nut is rotated, the screw rod generates axial movement relative to the nut.

8. The model attitude control device for water tunnel experiment according to claim 1, characterized in that: The cover plate is fixedly connected to the experimental section through a fixing piece.

9. The model attitude control device for water tunnel experiment according to claim 1, characterized in that: A through hole is provided at one end of the sleeve close to the mounting piece. When the connecting rod slides relative to the sleeve, the fluid inside the sleeve flows in or out through the through hole.

10. The model attitude control device for water tunnel experiment according to claim 1, characterized in that: The mounting part comprises a threaded interface, and the sleeve is threadedly connected with the model.

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