A torsional stiffness test device for a rotor tension-torsion bar and its testing method

Abstract

The present invention relates to a torsional stiffness test device for a rotor tension-torsion bar and a test method thereof, belonging to the technical field of stiffness test devices, and solving the problem of low measurement accuracy in the existing stiffness test method for tension-torsion bars. The present invention includes: a load sensor, a first tension-torsion bar, a second tension-torsion bar, and a tension-torsion bar combined tooling; one end of the first tension-torsion bar is connected to the load sensor, and the other end is connected to the tension-torsion bar combined tooling; one end of the second tension-torsion bar is connected to the tension application end, and the other end is connected to the tension-torsion bar combined tooling; the tension-torsion bar combined tooling is used to apply torque; the tension application end applies an axial load; the load sensor is used to monitor the axial load of the first tension-torsion bar. The present invention connects two tension-torsion bars in series, and obtains the torsional stiffness by measuring the torsional angle and torque of the tension-torsion bar, thereby improving the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of stiffness test devices, and in particular, to a torsional stiffness test device for a rotor tension-torsion bar and a test method thereof. Background Art

[0002] The tension-torsion bar is a key component of the rotor system. Its function is to bear the centrifugal force of the blade and achieve pitch control through torsional deformation. The tension-torsion bar has a large number of parts and complex shape parameters, and it is difficult to determine its specific design parameters through materials and theoretical analysis. Therefore, through experimental research, parameters such as the strength characteristics of the tension-torsion bar, the torsional stiffness when bearing the centrifugal force, and the force characteristics during torsional deformation are mastered. The stiffness of the tension-torsion bar is the main input for the design of the tension-torsion bar and is also an important parameter for the calculation model of the strength and stiffness of the tension-torsion bar. Therefore, the tension-torsion bar stiffness test is an important test in the design stage of the tension-torsion bar.

[0003] The current test method is to connect both ends of the tension-torsion bar to the double ears. One end is axially limited to provide freedom of rotation, usually realized by a thrust bearing; at the same time, a torsional loading mechanism provides a torsional load; the other end applies an axial load while limiting the rotation direction. It can be found from the mechanical manual that the friction force of the thrust bearing is within the general range in the bearing and is not extremely small. Even if the friction force of the thrust bearing is relatively small and the generated reverse torque is relatively small, since the stiffness of the tension-torsion bar itself is also small, when the torsional stiffness provided by the bearing friction cannot be ignored compared with the torsional stiffness of the tension-torsion bar, it will lead to relatively low measurement accuracy and poor evaluation.

[0004] Although the friction force of the thrust bearing is very small when it undergoes torsional deformation without bearing tensile force, when it bears a simulated centrifugal force of about 5 tons, the friction force during torsion cannot be directly ignored. And the functional requirements of the tension-torsion bar as a component on the rotor that bears centrifugal force and provides freedom of rotation result in its relatively small stiffness. Otherwise, it is not suitable as a torque-bearing component of the rotor at all. When the ratio of the torque borne by the tension-torsion bar to the torque caused by the friction force of the thrust bearing is not clear, the reaction force during the torsion of the thrust bearing will be reflected as an error in the tension-torsion bar stiffness data, which leads to relatively low measurement accuracy and poor evaluation.

[0005] Therefore, the problem of the existing test method is that when the axial load is relatively large, the bearing that provides freedom of rotation in the torsional direction will generate non-negligible friction force during torsion, resulting in relatively low measurement accuracy. Summary of the Invention

[0006] In view of the above analysis, the present invention aims to provide a torsional stiffness test device for a rotor tension-torsion bar to solve the problem of low measurement accuracy of the existing tension-torsion bar stiffness test method.

[0007] The object of the present invention is mainly achieved through the following technical solutions:

[0008] A torsional stiffness test device for a rotor tension-torsion bar, comprising: a load sensor, a first tension-torsion bar, a second tension-torsion bar, and a tension-torsion bar combination tooling; one end of the first tension-torsion bar is connected to the load sensor, and the other end is connected to the tension-torsion bar combination tooling; one end of the second tension-torsion bar is connected to a tension application end, and the other end is connected to the tension-torsion bar combination tooling; the tension-torsion bar combination tooling is used to apply torque to the first tension-torsion bar and the second tension-torsion bar; the tension application end applies axial load to the first tension-torsion bar and the second tension-torsion bar; the load sensor is used to monitor the axial load, i.e., axial tension, of the first tension-torsion bar and the second tension-torsion bar.

[0009] Further, the first tension-torsion bar and the second tension-torsion bar are connected in series through the tension-torsion bar combination tooling.

[0010] Further, it further comprises: a base, a first fixed support, a second fixed support, and a third fixed support; the first fixed support, the second fixed support, and the third fixed support are fixedly installed on the base at equal intervals in sequence.

[0011] Further, the second fixed support is a U-shaped support with two vertical risers; the tension-torsion bar combination tooling is rotatably installed on the second fixed support. Specifically, the tension-torsion bar combination tooling is rotatably installed on the two vertical risers through two radial limiting bearings.

[0012] Further, it further comprises: a first tension-torsion bar joint and a second tension-torsion bar joint.

[0013] Further, the first tension-torsion bar joint is installed on the first fixed support, and the first tension-torsion bar is fixedly connected to the first tension-torsion bar joint.

[0014] Further, the second tension-torsion bar joint is installed on the third fixed support, and the second tension-torsion bar is fixedly connected to the second tension-torsion bar joint.

[0015] Further, it further comprises: a torque application assembly; the torque application assembly is used to apply torque to the tension-torsion bar combination tooling.

[0016] Further, the torque application assembly comprises: a torque application rocker arm, a connecting rod, and a linear servo; one end of the torque application rocker arm is fixedly connected to the tension-torsion bar combination tooling, and the other end is hinged to one end of the connecting rod; the other end of the connecting rod is hinged to the output shaft of the linear servo; the linear servo is used to output linear displacement and measure torsion force.

[0017] Further, a support beam is fixedly connected between the first fixed support and the third fixed support; the linear servo is fixedly installed on the support beam.

[0018] Further, the first tension-torsion bar joint passes through the first fixed support and is fixedly connected to the load sensor; the load sensor is fixedly installed on the first fixed support.

[0019] Further, the second tension-torsion bar joint passes through the third fixed support and is fixedly connected to the tension application end.

[0020] A test method for the torsional stiffness of a rotor tension-torsion bar uses a rotor tension-torsion bar torsional stiffness test device to test the torsional stiffness of the tension-torsion bar, including the following steps:

[0021] Step S1: Install the first tension-torsion bar and the second tension-torsion bar into the rotor tension-torsion bar torsional stiffness test device;

[0022] Step S2: Drive the torque application rocker arm to deflect through a linear servo, and apply torque to the tension-torsion bar combined tooling 8; the tension-torsion bar combined tooling drives the first tension-torsion bar and the second tension-torsion bar to perform synchronous torsional motion;

[0023] Step S3: Measure the torsion forces of the first tension-torsion bar and the second tension-torsion bar through the linear servo, measure the torsional angles of the first tension-torsion bar and the second tension-torsion bar with an angle gauge, and calculate the torsional stiffness of the first tension-torsion bar and the second tension-torsion bar.

[0024] The technical solution of the present invention can at least achieve one of the following effects:

[0025] 1) In the present invention, the first tension-torsion bar and the second tension-torsion bar are connected in series by using a tension-torsion bar combined tooling, and the coordinated deformation of their torsion is realized by the way of the series-combined tension-torsion bars. Furthermore, by driving the tension-torsion bar combined tooling to deflect through a linear servo, the tension is applied to the two tension-torsion bars simultaneously, so that the tensions received by the two groups of tension-torsion bars are the same and the torques are symmetric, thereby doubling the overall stiffness and further achieving better measurement accuracy.

[0026] 2) In the test mechanism of the present invention, other bearing units with unknown torsional stiffness are removed, that is, the influence of the thrust bearing is removed, and the measured torsional stiffness is the stiffness of the tension-torsion bar itself. The radial limit bearing of the present invention only limits the radial displacement of the tension-torsion bar combined tooling, and the tension-torsion bar combined tooling can perform torsional motion and axial motion relative to the radial limit bearing, and basically no friction is generated; due to the elimination of the friction influence of the thrust bearing, the accuracy of the stiffness test is improved.

[0027] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent specification, and some advantages can be made obvious from the specification, or understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the content specifically pointed out in the specification and the drawings. Description of the Drawings

[0028] The drawings are only for the purpose of showing specific embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference signs denote the same components.

[0029] Figure 1 is a torsional stiffness test device for the rotor tension-torsion bar of the present invention;

[0030] Figure 2 is a test schematic diagram of the torsional stiffness test device for the rotor tension-torsion bar of the present invention.

[0031] Reference Signs:

[0032] 1 - load sensor; 2 - first tension-torsion bar; 3 - second tension-torsion bar; 4 - support beam; 5 - linear servo; 6 - connecting rod; 7 - torque application rocker arm; 8 - tension-torsion bar combination tooling; 9 - connecting pin; 10 - base; 11 - first fixed support; 12 - second fixed support; 13 - third fixed support; 14 - first tension-torsion bar joint; 15 - radial limit bearing; 16 - second tension-torsion bar joint; 17 - centrifugal force loading nut. Detailed Description of the Embodiments

[0033] The following will specifically describe the preferred embodiments of the present invention in conjunction with the drawings. The drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principles of the present invention, and are not used to limit the scope of the present invention.

[0034] Embodiment 1

[0035] A specific embodiment of the present invention discloses a torsional stiffness test device for a rotor tension-torsion bar, as Figure 1As shown in the figure, it includes: a load sensor 1, a first tension-torsion bar 2, a second tension-torsion bar 3, and a tension-torsion bar combination tooling 8; one end of the first tension-torsion bar 2 is connected to the load sensor 1 through a first tension-torsion bar joint 14, and the other end is connected to the tension-torsion bar combination tooling 8; one end of the second tension-torsion bar 3 is connected to the tension application end through a second tension-torsion bar joint 16, and the other end is connected to the tension-torsion bar combination tooling 8; the tension-torsion bar combination tooling 8 is used to apply torque to the first tension-torsion bar 2 and the second tension-torsion bar 3; the tension application end applies axial load to the first tension-torsion bar 2 and the second tension-torsion bar 3; the load sensor 1 is used to monitor the axial load of the first tension-torsion bar 2 and the second tension-torsion bar 3; the linear servo 5 is used to measure the torsion force of the first tension-torsion bar 2 and the second tension-torsion bar 3.

[0036] As Figure 2 shown, the first tension-torsion bar 2 and the second tension-torsion bar 3 are connected in series through the tension-torsion bar combination tooling 8. When the tension-torsion bar combination tooling 8 deflects, it can drive the first tension-torsion bar 2 and the second tension-torsion bar 3 to twist synchronously. The first tension-torsion bar 2 and the second tension-torsion bar 3 have the same structure. Through the synchronous action of the two, after measuring the torque and twist angle of the first tension-torsion bar 2 and the second tension-torsion bar 3, the torsional stiffness is calculated, which is equivalent to taking the average value of two stiffness tests under the same conditions, and the measured result is more accurate.

[0037] Further, as Figure 1 shown, the present invention further includes: a base 10, a first fixed support 11, a second fixed support 12, and a third fixed support 13; the first fixed support 11, the second fixed support 12, and the third fixed support 13 are fixedly installed on the base 10.

[0038] Specifically, the first fixed support 11, the second fixed support 12, and the third fixed support 13 are arranged in a straight line on the base 10; and, the first fixed support 11, the second fixed support 12, and the third fixed support 13 are equally spaced, that is, the distance between the first fixed support 11 and the second fixed support 12 is equal to the distance between the second fixed support 12 and the third fixed support 13.

[0039] Further, the second fixed support 12 is a U-shaped support with two vertical plates; the tension-torsion bar combination tooling 8 is rotatably installed on the two vertical plates through two radial limiting bearings 15.

[0040] Specifically, bearing installation holes are provided on both vertical plates; the bearing installation holes are used to install the two radial limiting bearings 15, and the two radial limiting bearings 15 are coaxially installed. The outer ring of the radial limiting bearing 15 is fixedly connected to the second fixed support 12 through interference fit, and the inner ring of the radial limiting bearing 15 is fixedly connected to the tension-torsion bar combination tooling 8 through interference fit.

[0041] By providing a radial limiting bearing 15, the combined tension and torsion bar tooling 8 can rotate freely relative to the second fixed support 12. Specifically, the radial limiting bearing 15 is a deep groove ball bearing.

[0042] Furthermore, the present invention further includes: a torque application assembly; the torque application assembly is used to apply torque to the combined tension and torsion bar tooling 8.

[0043] A specific embodiment of the present invention is as follows:

[0044] The torque application assembly includes: a torque application rocker arm 7, a connecting rod 6, and a linear servo 5; one end of the torque application rocker arm 7 is fixedly connected to the combined tension and torsion bar tooling 8, and the other end is hinged to one end of the connecting rod 6; the other end of the connecting rod 6 is hinged to the output shaft of the linear servo 5; the linear servo 5 is used to output linear displacement.

[0045] Specifically, the torque application rocker arm 7 is fixedly installed in the middle of the combined tension and torsion bar tooling 8. When the torque application rocker arm 7 deflects, it can drive the first tension and torsion bar 2 and the second tension and torsion bar 3 on both sides to twist synchronously through the combined tension and torsion bar tooling 8.

[0046] During implementation, a crank-slider mechanism is formed among the torque application rocker arm 7, the connecting rod 6, and the linear servo 5. By the linear servo 5 outputting linear displacement, the connecting rod 6 is driven to displace and deflect, and further the torque application rocker arm 7 is driven to deflect. Furthermore, the torque application rocker arm 7 and the combined tension and torsion bar tooling 8 are an integral structure. When the torque application rocker arm 7 deflects, the combined tension and torsion bar tooling 8 also deflects synchronously.

[0047] Since both the first tension and torsion bar 2 and the second tension and torsion bar 3 are connected to and in series with the combined tension and torsion bar tooling 8, when the combined tension and torsion bar tooling 8 deflects, the first tension and torsion bar 2 and the second tension and torsion bar 3 twist synchronously with the same angle.

[0048] Furthermore, a support beam 4 is fixedly connected between the first fixed support 11 and the third fixed support 13; the linear servo 5 is fixedly installed on the support beam 4.

[0049] Furthermore, the first tension and torsion bar joint 14 passes through the first fixed support 11 and is fixedly connected to the load sensor 1; the load sensor 1 is fixedly installed on the first fixed support 11.

[0050] Furthermore, the second tension and torsion bar joint 16 passes through the third fixed support 13 and is fixedly connected to the tension application end;

[0051] Specifically, a first interface mounting hole is provided on the first fixed support 11, and a second interface mounting hole is provided on the third fixed support 13. The first interface mounting hole is used to mount the first torsion bar connector 14; the second interface mounting hole is used to mount the second torsion bar connector 16, and the first interface mounting hole and the second interface mounting hole are coaxial.

[0052] In a specific implementation manner of the present invention, the tension applying end is a centrifugal force loading nut 17 .

[0053] Specifically, the portion of the second twist strip joint 16 extending out of the third fixed support 13 is provided with threads, and the centrifugal force loading nut 17 is connected to the second twist strip joint 16 by threads. When tension needs to be applied to the first twist strip 2 and the second twist strip 3, the centrifugal force loading nut 17 is tightened to make the second twist strip joint 16 tighten the first twist strip 2 and the second twist strip 3 to apply tension.

[0054] In another specific embodiment of the present invention, the tension applying end is an external tension device. Exemplarily, the external tension device is an actuator, a linear motor, a cylinder or a hydraulic cylinder.

[0055] Specifically, the portion of the second torsion bar joint 16 extending out of the third fixed support 13 is fixedly connected to an external tension device; and tension is applied to the second torsion bar joint 16 and the first torsion bar 2 and the second torsion bar 3 through the external tension device.

[0056] During implementation, two sets of twist bars are connected together using a twist bar assembly tool 8, such as Figure 1 As shown. Then, the torsion bars are fixed at both ends using torsion bar joints, and the radial limit bearing 15 is used to radially limit the middle torsion bar combination tooling 8, and the torque is applied in the middle using the torque application rocker arm 7. The torque will cause the two groups of torsion bars to twist at the same time, while the two ends of the torsion bars will not rotate. When the torsional stiffness of the two groups of torsion bars is the same, the stiffness of the middle part of the combination to withstand torque and torsional deformation is twice that of a single group of torsion bars.

[0057] Example 2

[0058] A specific embodiment of the present invention provides a method for testing the torsional stiffness of a rotor torsion bar, and the torsional stiffness test device for the rotor torsion bar described in Example 1 is used to test the torsional stiffness of the torsion bar, comprising the following steps:

[0059] Step S1: Install the first torsion bar 2 and the second torsion bar 3 into a rotor torsion bar torsional stiffness test device;

[0060] Step S2: Drive the torque application rocker arm 7 to deflect through the linear servo 5, and apply a torque to the tension-torsion bar combined tooling 8; the tension-torsion bar combined tooling 8 drives the first tension-torsion bar 2 and the second tension-torsion bar 3 to perform synchronous torsional motion;

[0061] Step S3: Measure the axial loads of the first tension-torsion bar 2 and the second tension-torsion bar 3 through the load sensor 1, measure the torsion force through the linear servo 5, measure the torsional angles of the first tension-torsion bar 2 and the second tension-torsion bar 3 through an angle gauge, and calculate the torsional stiffness of the first tension-torsion bar 2 and the second tension-torsion bar 3.

[0062] In a specific embodiment of the present invention:

[0063] In the said step S1, the installation method of the first tension-torsion bar 2 and the second tension-torsion bar 3 is as follows:

[0064] Step S11: Install the tension-torsion bar combined tooling 8 onto the second fixed support 2 through two deep groove ball bearings with radial limits.

[0065] Step S12: Connect the two groups of tension-torsion bars to the tension-torsion bar combined tooling 8 through the connecting pins 9 respectively to achieve the axial series connection of the two groups of tension-torsion bars.

[0066] Specifically, one end of the first tension-torsion bar 2 is fixedly connected to the first tension-torsion bar joint 14 through the connecting pin 9, and the other end is fixedly connected to the tension-torsion bar combined tooling 8 through the connecting pin 9; the installation of the first tension-torsion bar 2 is completed. One end of the second tension-torsion bar 3 is fixedly connected to the second tension-torsion bar joint 16 through the connecting pin 9, and the other end is fixedly connected to the tension-torsion bar combined tooling 8 through the connecting pin 9; the series installation and fixation of the first tension-torsion bar 2 and the second tension-torsion bar 3 are completed.

[0067] Step S13: The first tension-torsion bar joint 14 passes through the first fixed support 11 and is fixedly connected to the load sensor 1; the part of the second tension-torsion bar joint 16 extending out of the third fixed support 13 is connected to the tension application end, and a tension is applied to the first tension-torsion bar 2 and the second tension-torsion bar 3 through the tension application end.

[0068] Specifically, the tension application end is a centrifugal force loading nut 17 or an external tension device;

[0069] Step S13a: When the tension application end is the centrifugal force loading nut 17: The part of the second tension-torsion bar joint 16 extending out of the third fixed support 13 is provided with threads, and the centrifugal force loading nut 17 is threadedly connected to the second tension-torsion bar joint 16. Tighten the centrifugal force loading nut 17 to make the first tension-torsion bar joint 14, the first tension-torsion bar 2, the second tension-torsion bar 3, and the second tension-torsion bar joint 16 in tension and apply a tension.

[0070] Step S13b: When the tension application end is an external tension device: Fix the part of the second tension-torsion bar joint 16 extending out of the third fixed support 13 to the external tension device; Apply tension to the second tension-torsion bar joint 16, the first tension-torsion bar 2, and the second tension-torsion bar 3 through the external tension device.

[0071] After installation, one end of the first tension-torsion bar 2 connected to the first tension-torsion bar joint 14 is fixed and remains stationary throughout the loading process. One end of the second tension-torsion bar 3 connected to the second tension-torsion bar joint 16 is connected to the tension application end; Further, a rotary centrifugal force loading nut 17 is used to apply tension to simulate centrifugal force, or a actuator is used to apply tension to the second tension-torsion bar joint 16 to simulate centrifugal force.

[0072] In a specific embodiment of the present invention:

[0073] In the said step S2, the process of the linear servo 5 driving the tension-torsion bar combination tooling 8 to deflect is as follows:

[0074] Step S21: The linear servo 5 outputs a linear displacement, driving the connecting rod 6 to displace and deflect.

[0075] Step S22: The connecting rod 6 drives the torque application rocker arm 7 to perform an angular deflection movement; The tension-torsion bar combination tooling 8 synchronously deflects at an angle with the torque application rocker arm 7.

[0076] Step S23: When the tension-torsion bar combination tooling 8 deflects at an angle, it drives the first tension-torsion bar 2 and the second tension-torsion bar 3 to twist synchronously, applying an equal torque to the first tension-torsion bar 2 and the second tension-torsion bar 3.

[0077] In a specific embodiment of the present invention:

[0078] In the said step S3, the rotor tension-torsion bar torsional stiffness test device of the present invention can conduct tension-torsion bar stiffness tests and tension-torsion bar fatigue tests; Specifically,

[0079] In step S31, when conducting a tension-torsion bar stiffness test, the linear servo 5 outputs a continuous linear displacement, thereby driving the angular displacement of the tension-torsion bar combination tooling 8 to gradually increase; Further, by measuring the angles and torques of the first tension-torsion bar 2 and the second tension-torsion bar 3, calculate the relationship between the magnitude of the applied torque and the torsional angle of the tension-torsion bar, so as to obtain the torsional stiffness of the tension-torsion bar.

[0080] Further, in order to ensure the accuracy of angle measurement, measure the angles of the first tension-torsion bar 2 and the second tension-torsion bar 3 multiple times and take the average value as the torsional angle of the tension-torsion bar.

[0081] Step S32: When performing the fatigue test on the tension-torsion bar, the linear servo 5 outputs a reciprocating linear displacement to drive the tension-torsion bar combined tooling 8 to reciprocate and deflect, thereby applying an alternating load to the first tension-torsion bar 2 and the second tension-torsion bar 3 and conducting a fatigue test on the tension-torsion bar.

[0082] Compared with the prior art, the rotor tension-torsion bar torsional stiffness test device provided in this embodiment has at least one of the following advantages:

[0083] (1) It can significantly reduce the number of toolings required for the test and lower the test cost.

[0084] (2) Since the friction influence of the thrust bearing is excluded, the accuracy of the stiffness test is improved.

[0085] (3) By giving a fixed command value to the linear servo 5 through the position control method, and the linear servo 5 executes the command to apply a continuous alternating load to the torque application rocker arm 7, the fatigue test of the tension-torsion bar can be achieved.

[0086] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A torsional stiffness test device for a rotor tension-torsion bar, characterized in that, Comprising: A load sensor (1), a first tension-torsion bar (2), a second tension-torsion bar (3), a linear servo (5), and a tension-torsion bar combination tooling (8); one end of the first tension-torsion bar (2) is connected to the load sensor (1), and the other end is connected to the tension-torsion bar combination tooling (8); one end of the second tension-torsion bar (3) is connected to the tension application end, and the other end is connected to the tension-torsion bar combination tooling (8); the tension-torsion bar combination tooling (8) is used to apply torque to the first tension-torsion bar (2) and the second tension-torsion bar (3); the tension application end applies axial load to the first tension-torsion bar (2) and the second tension-torsion bar (3); the load sensor (1) is used to monitor the axial load of the first tension-torsion bar (2) and the second tension-torsion bar (3); the linear servo (5) is used to apply torque to the tension-torsion bar combination tooling (8) and measure the torsion force.

2. The torsional stiffness test device for the rotor tension-torsion bar according to claim 1, wherein The first tension-torsion bar (2) and the second tension-torsion bar (3) are connected in series through the tension-torsion bar combination tooling (8).

3. The torsional stiffness test device for the rotor tension-torsion bar according to claim 2, characterized in that, Further comprising: A base (10), a first fixed support (11), a second fixed support (12), and a third fixed support (13); the first fixed support (11), the second fixed support (12), and the third fixed support (13) are fixedly installed on the base (10).

4. The torsional stiffness test device for the rotor tension-torsion bar according to claim 3, wherein The second fixed support (12) is a U-shaped support with two vertical plates; the tension-torsion bar combination tooling (8) is rotatably installed on the second fixed support (12).

5. The torsional stiffness test device for the rotor tension-torsion bar according to claim 4, characterized in that, Further comprising: A first tension-torsion bar joint (14) and a second tension-torsion bar joint (16).

6. The torsional stiffness test device for the rotor tension-torsion bar according to claim 5, characterized in that, The first tension-torsion bar joint (14) is installed on the first fixed support (11), and the first tension-torsion bar (2) is fixedly connected to the first tension-torsion bar joint (14).

7. The torsional stiffness test device for the rotor tension-torsion bar according to claim 6, characterized in that, The second tension-torsion bar joint (16) is installed on the third fixed support (13), and the second tension-torsion bar (3) is fixedly connected to the second tension-torsion bar joint (16).

8. The torsional stiffness test device for the rotor tension-torsion bar according to claim 5, wherein The first tension-torsion bar joint (14) passes through the first fixed support (11) and is fixedly connected to the load sensor (1); the load sensor (1) is fixedly installed on the first fixed support (11).

9. The torsional stiffness test device for the rotor tension-torsion bar according to claim 5, wherein The second tension-torsion bar joint (16) passes through the third fixed support (13) and is fixedly connected to the tension application end.

10. A test method for the torsional stiffness of a rotor pull-torsion bar, characterized in that, Using the rotor tension-torsion bar torsional stiffness test device according to any one of claims 1-9 to conduct a torsional stiffness test on the tension-torsion bar, including the following steps: Step S1: Install the first tension-torsion bar (2) and the second tension-torsion bar (3) into the rotor tension-torsion bar torsional stiffness test device; Step S2: Drive the torque application rocker arm (7) to deflect through the linear servo (5) to apply torque to the tension-torsion bar combination tooling (8); the tension-torsion bar combination tooling (8) drives the first tension-torsion bar (2) and the second tension-torsion bar (3) to perform synchronous torsional motion; Step S3: Measure the axial load of the first tension-torsion bar (2) and the second tension-torsion bar (3) through the load sensor (1), measure the torsional angle of the first tension-torsion bar (2) and the second tension-torsion bar (3) through an angle gauge, measure the torsion force through the linear servo (5), and calculate the torsional stiffness of the first tension-torsion bar (2) and the second tension-torsion bar (3).

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