CN110160732B - Friction force adjustable device and friction force adjustable method for flutter test - Google Patents
Friction force adjustable device and friction force adjustable method for flutter test Download PDFInfo
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- CN110160732B CN110160732B CN201810899722.3A CN201810899722A CN110160732B CN 110160732 B CN110160732 B CN 110160732B CN 201810899722 A CN201810899722 A CN 201810899722A CN 110160732 B CN110160732 B CN 110160732B
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides an adjustable friction device and an adjustable friction method for flutter test, the device comprises a base, a bending rigidity spring piece, a plurality of friction adjusting rings made of different materials, a plurality of adjusting cushion blocks with different heights and a fastening assembly, wherein the connecting end of the bending rigidity spring piece is fixedly arranged on the base, the open end of the bending rigidity spring piece is provided with a first accommodating cavity and a second accommodating cavity, the first accommodating cavity is used for accommodating a rudder shaft, the friction adjusting rings are alternately arranged in the first accommodating cavity and sleeved on the rudder shaft, the adjusting cushion blocks are alternately arranged in the second accommodating cavity to adjust the size of the first accommodating cavity, the fastening assembly is used for locking the second accommodating cavity of the bending rigidity spring piece, the friction force adjustable device adjusts the friction force of the rotation freedom degree of the rudder shaft by adjusting the material of the friction adjusting ring and/or adjusting the height of the cushion block. By applying the technical scheme of the invention, the technical problem that the influence rule of the friction force on the flutter characteristic cannot be obtained in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of nonlinear flutter tests, in particular to an adjustable friction force device and an adjustable friction force method for a flutter test.
Background
The control surface is an important control surface on the missile. When the flutter characteristic of the control surface is researched, the friction nonlinearity research of the control surface structure is very important. The influence of the friction force on the flutter speed and the limit ring characteristic of the structure can be obtained by numerical simulation. In the model flutter research, how to improve the flutter speed by increasing the friction force is a difficulty. However, due to the complexity of friction nonlinearity, it is difficult to accurately simulate the friction force of the friction structure in the flutter test process, so that the influence rule of the friction force on the flutter characteristic cannot be obtained.
Disclosure of Invention
The invention provides an adjustable friction force device and an adjustable friction force method for a flutter test, which can solve the technical problem that the influence rule of friction force on flutter characteristics cannot be obtained in the prior art.
According to an aspect of the present invention, there is provided an adjustable friction device for flutter test, the adjustable friction device comprising: a base; the bending stiffness spring piece is provided with a connecting end and an opening end, the connecting end of the bending stiffness spring piece is fixedly arranged on the base, the opening end of the bending stiffness spring piece is provided with a first accommodating cavity and a second accommodating cavity which are communicated, the first accommodating cavity is used for accommodating the rudder shaft, and the length direction of the bending stiffness spring piece is vertical to the axial direction of the rudder shaft; the friction adjusting rings are made of different materials and are alternately arranged in the first accommodating cavity and sleeved on the rudder shaft; the plurality of adjusting cushion blocks are arranged in the second accommodating cavity alternately to adjust the size of the first accommodating cavity; the fastening assembly is arranged at the opening end of the bending rigidity spring piece and used for locking the second accommodating cavity of the bending rigidity spring piece; the friction force adjustable device adjusts the friction force of the rotation freedom degree of the rudder shaft by adjusting the material of the friction adjusting ring and/or adjusting the height of the cushion block.
Further, bending rigidity spring leaf includes bending rigidity linkage segment, first arc centre gripping section, second arc centre gripping section, first joint section and second joint section, the one end of first arc centre gripping section and the one end of second arc centre gripping section all are connected with bending rigidity linkage segment, first arc centre gripping section and second arc centre gripping section enclose into first chamber that holds jointly, the other end and the first joint section of first arc centre gripping section are connected, the other end and the second joint section of second arc centre gripping section are connected, first joint section and second joint section parallel arrangement hold the chamber in order to form the second.
Further, the fastening assembly comprises a screw and a nut, and the screw penetrates through the first clamping section and the second clamping section respectively and is matched with the nut to lock the second accommodating cavity of the bending rigidity spring piece.
Further, the material of the friction adjusting ring comprises polytetrafluoroethylene, phenolic plastics or bronze materials.
Furthermore, the structural shape of the adjusting cushion block comprises a circular shape or a square shape, the adjusting cushion block is provided with a central through hole, the adjusting cushion block is arranged between the first clamping section and the second clamping section, and a screw sequentially penetrates through the first clamping section, the central through hole of the adjusting cushion block and the second clamping section and is matched with a nut to connect the bending rigidity spring piece with the rudder shaft.
Further, the height of the adjusting cushion block is inversely proportional to the friction force of the rotation freedom degree of the rudder shaft.
According to a further aspect of the present invention there is provided an adjustable friction method for flutter testing, the adjustable friction method using an adjustable friction device as described above.
Further, the adjustable friction method comprises: step one, installing a friction adjusting ring on a rudder shaft; sleeving a bending rigidity spring piece outside the friction adjusting ring so that the friction adjusting ring and the rudder shaft are both positioned in a first accommodating cavity of the bending rigidity spring piece; step three, fixedly arranging the bending rigidity spring piece on the base; fourthly, inserting an adjusting cushion block into a second accommodating cavity of the bending rigidity spring piece, and connecting the bending rigidity spring piece with the rudder shaft through a fastening assembly; measuring the friction force of the rotation freedom degree of the rudder shaft; step six, changing the thickness of the adjusting cushion block and the material of the friction adjusting ring, repeating the steps one to five, respectively measuring the friction force of the rotation freedom degree of the rudder shaft, and recording and storing the measurement result; and step seven, selecting the combination state of the adjusting cushion block and the friction adjusting ring according to the record of the measuring result to carry out the test during the flutter test.
By applying the technical scheme of the invention, the adjustable friction force device for the flutter test is provided, and the device can realize the accurate control of the friction force of the rotation (torsion) freedom degree of the rudder shaft in the flutter test process by adjusting the material of the friction adjusting ring and/or the thickness of the adjusting cushion block. Because the control surface and the control shaft are designed integrally, the friction force of the rotational (torsional) freedom degree in the flutter test process can be accurately controlled by adjusting the material of the friction adjusting ring and/or the thickness of the adjusting cushion block, and the problem of influence of the friction force on the flutter characteristic of the control surface structure in the flutter test is solved. Meanwhile, the friction force adjustable device can obtain the influence rule of the friction force on the flutter characteristic and the limit cycle characteristic by adjusting the friction force.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 illustrates a front view of an adjustable friction device for flutter testing provided in accordance with a particular embodiment of the present invention;
FIG. 2 shows a top view of the adjustable friction device provided in FIG. 1 for flutter testing;
fig. 3 shows a cross-sectional view of the adjustable friction device provided in fig. 1 for the flutter test.
Wherein the figures include the following reference numerals:
10. a base; 20. a bending stiffness spring leaf; 20a, a first accommodating cavity; 20b, a second accommodating cavity; 21. a bending stiffness connection section; 22. a first arcuate clamping section; 23. a second arcuate clamping section; 24. a first clamping section; 25. a second clamping section; 30. a friction adjusting ring; 40. adjusting the cushion block; 50. a fastening assembly; 51. a screw; 52. a nut; 100. a rudder shaft.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1 to 3, an adjustable friction device for flutter test is provided according to an embodiment of the present invention, the adjustable friction device includes a base 10, a bending stiffness spring plate 20, a plurality of friction adjusting rings 30 made of different materials, a plurality of adjusting pads 40 made of different heights, and a fastening assembly 50, the bending stiffness spring plate 20 has a connecting end and an open end, the connecting end of the bending stiffness spring plate 20 is fixedly disposed on the base 10, the open end of the bending stiffness spring plate 20 has a first accommodating cavity 20a and a second accommodating cavity 20b communicated with each other, the first accommodating cavity 20a is used for accommodating a rudder shaft 100, a length direction of the bending stiffness spring plate 20 is perpendicular to an axial direction of the rudder shaft, the friction adjusting rings 30 are alternately disposed in the first accommodating cavity 20a and sleeved on the rudder shaft, the adjusting pads 40 are alternately disposed in the second accommodating cavity 20b to adjust a size of the first accommodating cavity 20a, a fastening member 50 is provided at the open end of the bending rigidity spring piece 20, the fastening member 50 being for locking the second accommodation chamber 20b of the bending rigidity spring piece 20; the friction force adjusting device adjusts the friction force of the rotation degree of freedom of the rudder shaft by adjusting the material of the friction adjusting ring 30 and/or adjusting the height of the cushion block 40.
By applying the configuration mode, the adjustable friction force device for the flutter test is provided, and the friction force of the rotation (torsion) freedom degree of the rudder shaft in the flutter test process can be accurately controlled by adjusting the material of the friction adjusting ring and/or the thickness of the adjusting cushion block. Because the control surface and the control shaft are designed integrally, the friction force of the rotational (torsional) freedom degree in the flutter test process can be accurately controlled by adjusting the material of the friction adjusting ring and/or the thickness of the adjusting cushion block, and the problem of influence of the friction force on the flutter characteristic of the control surface structure in the flutter test is solved. Meanwhile, the friction force adjustable device can obtain the influence rule of the friction force on the flutter characteristic and the limit cycle characteristic by adjusting the friction force.
In the present invention, the material of the friction adjusting ring 30 includes polytetrafluoroethylene, phenolic plastic, or bronze. As an embodiment of the present invention, in order to adjust the friction force of the rotation (torsion) degree of freedom of the rudder shaft, the friction adjusting ring and the adjusting pad block can be simultaneously adjusted by the material and the thickness of the adjusting pad block. As another embodiment of the present invention, the frictional force of the rotation (torsion) degree of freedom of the rudder shaft can be adjusted by changing only the thickness of the adjustment pad while keeping the material of the friction adjustment ring unchanged. Alternatively, the thickness of the adjusting cushion block can be kept unchanged, and the friction force of the rotation (torsion) freedom degree of the rudder shaft can be adjusted by only changing the material of the friction adjusting ring.
Further, in the present invention, as shown in fig. 3, the bending stiffness spring plate 20 includes a bending stiffness connection section 21, a first arc-shaped clamping section 22, a second arc-shaped clamping section 23, a first clamping section 24 and a second clamping section 25, one end of the first arc-shaped clamping section 22 and one end of the second arc-shaped clamping section 23 are both connected to the bending stiffness connection section 21, the first arc-shaped clamping section 22 and the second arc-shaped clamping section 23 jointly enclose a first accommodating cavity 20a, the other end of the first arc-shaped clamping section 22 is connected to the first clamping section 24, the other end of the second arc-shaped clamping section 23 is connected to the second clamping section 25, and the first clamping section 24 and the second clamping section 25 are arranged in parallel to form a second accommodating cavity 20 b.
By applying the configuration mode, the friction adjusting ring 30 is installed on the rudder shaft 100, the friction adjusting ring 30 and the rudder shaft 100 are in transition fit, the bending stiffness spring piece 20 is sleeved on the friction adjusting ring 30 so that the friction adjusting ring 30 is located in the first accommodating cavity 20a of the bending stiffness spring piece 20, and the adjusting cushion block 40 is arranged in the second accommodating cavity 20b so as to adjust the size of the first accommodating cavity 20a, so that the accurate control of the rotation (torsion) freedom degree friction force of the rudder shaft in the flutter test process can be realized by adjusting the material of the friction adjusting ring and/or the thickness of the adjusting cushion block.
Further, in the present invention, in order to achieve the fixed connection between the bending stiffness spring plate and the rudder shaft, the fastening assembly 50 may be configured to include a screw 51 and a nut 52, and the screw 51 passes through the first clamping section 24 and the second clamping section 25 respectively and cooperates with the nut 52 to lock the second accommodating chamber 20b of the bending stiffness spring plate 20.
With this arrangement, when the friction force of the device is measured, after the material of the friction adjustment ring 30 and the thickness of the adjustment pad 40 are selected, the friction adjustment ring 30 is mounted on the rudder shaft 100, one end of the bending stiffness leaf spring 20 is sleeved on the friction adjustment ring 30 so that the friction adjustment ring 30 is located in the first accommodation cavity 20a of the bending stiffness leaf spring 20, one end of the bending stiffness leaf spring 20 is fixed on the base 10 by a fastening screw, the adjustment pad 40 is arranged in the second accommodation cavity 20b so as to adjust the size of the first accommodation cavity 20a, and the second accommodation cavity 20b of the bending stiffness leaf spring 20 is locked by tightening the screw 51 and the nut 52, so that the friction force of the rotation (torsion) degree of freedom of the rudder shaft under the material of the selected friction adjustment ring 30 and the thickness of the adjustment pad 40 can be measured.
Further, in the present invention, the structural shape of the adjusting pad block 40 includes a circular shape or a square shape, the adjusting pad block 40 has a central through hole, the adjusting pad block 40 is disposed between the first clamping section 24 and the second clamping section 25, and the screw 51 sequentially passes through the first clamping section 24, the central through hole of the adjusting pad block 40, and the second clamping section 25 and cooperates with the nut 52 to connect the bending stiffness spring piece 20 with the rudder shaft 100. In addition, in the present invention, the height of the adjusting pad 40 is determined by the magnitude of the required friction force, and the height can be selected according to the experimental requirements. Wherein, the height of the adjusting cushion block 40 is inversely proportional to the friction force of the rotation freedom degree of the rudder shaft.
According to another aspect of the present invention, there is provided an adjustable friction method for flutter testing using the adjustable friction device as described above. The adjustable friction method comprises the following steps: step one, installing a friction adjusting ring 30 on a rudder shaft; step two, sleeving the bending rigidity spring piece 20 outside the friction adjusting ring 30 so that the friction adjusting ring 30 and the rudder shaft are both positioned in the first accommodating cavity 20a of the bending rigidity spring piece 20; step three, fixedly arranging the bending rigidity spring piece 20 on the base 10; step four, plugging an adjusting cushion block 40 into a second accommodating cavity 20b of the bending rigidity spring piece 20, and connecting the bending rigidity spring piece 20 with the rudder shaft through a fastening assembly 50; measuring the friction force of the rotation freedom degree of the rudder shaft; step six, changing the thickness of the adjusting cushion block 40 and the material of the friction adjusting ring 30, repeating the steps one to five, respectively measuring the friction force of the rotation freedom degree of the rudder shaft, and recording and storing the measurement result; and step seven, selecting the combination state of the adjusting cushion block 40 and the friction adjusting ring 30 according to the record of the measuring result to carry out the test during the flutter test.
By applying the friction force adjustable method, the structural design that the rotation (torsion) freedom degree of the flutter test model design has adjustable friction force is realized, and the study on the influence rule of the rotation (torsion) freedom degree friction force nonlinearity on the flutter characteristic of the control surface is realized.
For a further understanding of the present invention, the adjustable friction device and method for flutter test of the present invention will be described in detail with reference to fig. 1 to 3.
As shown in fig. 1 to 3, as an embodiment of the present invention, the adjustable friction device includes a base 10, a bending stiffness spring plate 20, a plurality of friction adjusting rings 30 made of different materials, a plurality of adjusting pads 40 made of different heights, and a fastening assembly 50, where the friction adjusting rings 30 are made of teflon, phenolic plastic, or bronze material. Bending rigidity spring leaf 20 includes bending rigidity linkage segment 21, first arc centre gripping section 22, second arc centre gripping section 23, first joint section 24 and second joint section 25, the one end of first arc centre gripping section 22 and the one end of second arc centre gripping section 23 all are connected with bending rigidity linkage segment 21, first arc centre gripping section 22 and second arc centre gripping section 23 enclose jointly and enclose into first chamber 20a that holds, the other end and the first joint section 24 of first arc centre gripping section 22 are connected, the other end and the second joint section 25 of second arc centre gripping section 23 are connected, first joint section 24 and the parallel arrangement of second joint section 25 hold chamber 20b in order to form the second. The fastening assembly 50 includes a screw 51 and a nut 52. In order to adjust the frictional force, the following procedure is mainly performed.
Step one, installing a friction adjusting ring 30 made of a selected material on a rudder shaft 100;
step two, sleeving the bending rigidity spring piece 20 outside the friction adjusting ring 30, so that the friction adjusting ring 30 and the rudder shaft 100 are both positioned in the first accommodating cavity 20a of the bending rigidity spring piece 20;
step three, fixedly arranging the bending rigidity connecting section 21 of the bending rigidity spring piece 20 on the base 10 through a fastening screw;
step four, plugging the second accommodating cavity 20b of the bending rigidity spring piece 20 with the adjusting cushion block 40 with the selected height, and enabling the screw 51 to sequentially penetrate through the first clamping section 24, the central through hole of the adjusting cushion block 40 and the second clamping section 25 and to be matched with the nut 52 so as to connect the bending rigidity spring piece 20 with the rudder shaft 100;
measuring the friction force of the rotation freedom degree of the rudder shaft under the friction adjusting ring 30 made of the selected material and the adjusting cushion block 40 with the selected height;
step six, after the measurement is finished, loosening the nut 52, sequentially taking out the screw 51, the adjusting cushion block 40 and the friction adjusting ring 30 in the device, changing the thickness of the adjusting cushion block 40 and the material of the friction adjusting ring 30, repeating the steps one to five, respectively measuring the friction force of the rudder shaft rotation freedom degrees under the changed friction adjusting ring 30 and the adjusting cushion block 40, and recording and storing the measurement result;
and step seven, selecting the combination state of the adjusting cushion block 40 and the friction adjusting ring 30 according to the record of the measuring result to carry out the test during the flutter test.
In summary, compared with the prior art, the adjustable friction force device for the flutter test can realize accurate control of the friction force of the rotational (torsional) degree of freedom in the flutter test process, and solve the problem of influence of the friction force on the flutter characteristic of the control surface structure in the flutter test. Meanwhile, the friction force adjustable device can obtain the influence rule of the friction force on the flutter characteristic and the limit cycle characteristic by adjusting the friction force. Therefore, the invention has advanced technology, simple and practical test implementation method, greatly reduces the difficulty of model design and the cost of wind tunnel test, saves the development cost and has higher model practical value.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An adjustable friction method for flutter test, which uses an adjustable friction device to adjust the friction of a rudder shaft rotation degree of freedom, the adjustable friction device comprising:
a base (10);
the bending stiffness spring piece (20) is provided with a connecting end and an opening end, the connecting end of the bending stiffness spring piece (20) is fixedly arranged on the base (10), the opening end of the bending stiffness spring piece (20) is provided with a first accommodating cavity (20a) and a second accommodating cavity (20b) which are communicated, the first accommodating cavity (20a) is used for accommodating a steering shaft, and the length direction of the bending stiffness spring piece (20) is perpendicular to the axial direction of the steering shaft;
the friction adjusting rings (30) are made of different materials, and the friction adjusting rings (30) are alternately arranged in the first accommodating cavity (20a) and sleeved on the rudder shaft;
a plurality of adjusting cushion blocks (40) with different heights, wherein the adjusting cushion blocks (40) are alternately arranged in the second accommodating cavity (20b) to adjust the size of the first accommodating cavity (20 a);
a fastening member (50), the fastening member (50) being provided at an open end of the bending rigidity spring piece (20), the fastening member (50) being for locking the second accommodation chamber (20b) of the bending rigidity spring piece (20);
the adjustable friction method comprises the following steps:
step one, installing a friction adjusting ring (30) on a rudder shaft;
sleeving the bending rigidity spring piece (20) outside the friction adjusting ring (30) so that the friction adjusting ring (30) and the rudder shaft are both positioned in a first accommodating cavity (20a) of the bending rigidity spring piece (20);
step three, fixedly arranging the bending rigidity spring piece (20) on a base (10);
fourthly, inserting an adjusting cushion block (40) into a second accommodating cavity (20b) of the bending rigidity spring piece (20), and connecting the bending rigidity spring piece (20) with the rudder shaft through a fastening assembly (50);
measuring the friction force of the rotation freedom degree of the rudder shaft;
step six, changing the thickness of the adjusting cushion block (40) and/or the material of the friction adjusting ring (30), repeating the steps one to five, respectively measuring the friction force of the rotation freedom degree of the rudder shaft, and recording and storing the measurement result;
and seventhly, selecting the combination state of the adjusting cushion block (40) and the friction adjusting ring (30) according to the record of the measuring result during the flutter test to carry out the test.
2. The adjustable friction method for flutter testing according to claim 1, the bending stiffness spring piece (20) comprises a bending stiffness connecting section (21), a first arc-shaped clamping section (22), a second arc-shaped clamping section (23), a first clamping section (24) and a second clamping section (25), one end of the first arc-shaped clamping section (22) and one end of the second arc-shaped clamping section (23) are both connected with the bending rigidity connecting section (21), the first arc-shaped clamping section (22) and the second arc-shaped clamping section (23) jointly enclose the first accommodating cavity (20a), the other end of the first arc-shaped clamping section (22) is connected with the first clamping section (24), the other end of the second arc-shaped clamping section (23) is connected with the second clamping section (25), the first clamping section (24) and the second clamping section (25) are arranged in parallel to form the second accommodating cavity (20 b).
3. The adjustable friction method for flutter test according to claim 2, wherein the fastening assembly (50) comprises a screw (51) and a nut (52), the screw (51) respectively passes through the first clamping section (24) and the second clamping section (25) and cooperates with the nut (52) to lock the second accommodating cavity (20b) of the bending stiffness spring piece (20).
4. The adjustable friction method for flutter testing according to claim 3, wherein the material of the friction adjusting ring (30) comprises polytetrafluoroethylene, phenolic plastic or bronze material.
5. The adjustable friction method for flutter test according to claim 3, wherein the structural shape of the adjusting pad block (40) comprises a circular shape or a square shape, the adjusting pad block (40) has a central through hole, the adjusting pad block (40) is arranged between the first clamping section (24) and the second clamping section (25), and the screw (51) sequentially passes through the first clamping section (24), the central through hole of the adjusting pad block (40) and the second clamping section (25) and cooperates with the nut (52) to connect the bending stiffness spring piece (20) with the rudder shaft.
6. The adjustable friction method for flutter test according to claim 5, wherein the height of the adjusting pad block (40) is inversely proportional to the friction of the rudder shaft rotational degree of freedom.
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| WO2012084016A9 (en) * | 2010-12-21 | 2014-07-24 | 3E | A sliding yaw bearing with a rotor load dependent rotary stiffness |
| JP5783054B2 (en) * | 2012-01-16 | 2015-09-24 | 日本精工株式会社 | Steering device |
| CN102926324A (en) * | 2012-11-23 | 2013-02-13 | 杨丽茹 | Multifunctional rigidity adjustable speed locking force transmission devices |
| CN203178051U (en) * | 2012-12-31 | 2013-09-04 | 浙江工业大学 | Ultralow-frequency modal test gravitational equilibrium system |
| CN103231797A (en) * | 2013-04-18 | 2013-08-07 | 中国科学院长春光学精密机械与物理研究所 | Four-axle-linkage electric steering engine |
| CN106564617A (en) * | 2016-10-27 | 2017-04-19 | 北京实验工厂 | FLAP control plane loading device and function testing method |
| WO2020061534A1 (en) * | 2018-09-20 | 2020-03-26 | Egg Medical, Inc. | A sled-table for radiographic imaging and medical device integration |
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