A six-component dynamic calibration load application device for a rotating axis balance

Abstract

The invention discloses a six-component dynamic calibration load applying device for a rotating shaft balance, which belongs to the technical field of wind tunnel test, and comprises an output shaft, a rotating shaft balance, a loading head, an elastic coupling, a connecting shaft, a torque meter and a load motor; the loading head comprises an inner shaft, an outer cylinder and a plurality of force application hanging points; the output shaft, the rotating shaft balance, the inner shaft, a shaft sleeve, an elastic coupling, a connecting shaft, a torque meter rotor and an output shaft of the load motor are connected in sequence to form a rotating shaft system; when the balance is calibrated, the rotating shaft system rotates and the outer cylinder is stationary; through this scheme, the six components Fy, Fz, My, Mz, Fx and Mx can be loaded separately and any two or three components can be loaded comprehensively, so that the actual working state of the rotating shaft balance can be fully, truly and comprehensively simulated, and the measurement performance of each component of the balance can be accurately predicted and evaluated.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel testing, and in particular to a six-component dynamic calibration load applying device for a rotating axis balance. Background Art

[0002] Propeller wind tunnel test is an important means to evaluate and identify the aerodynamic performance of propellers. The measurement quality of propeller balance directly determines the accuracy of wind tunnel test data. The traditional propeller aerodynamic load measurement scheme uses a motor to drive the propeller to rotate, and uses a box balance (or rod balance) to measure the propeller load. Due to the limitation of motor power density, it is difficult to further increase the power of the motor under specific size requirements. The use of air motors as power sources has the characteristics of small size and strong power simulation capability, and is becoming more and more common in propeller wind tunnel tests.

[0003] In wind tunnel tests of propellers using air motors, a rotating axis balance is an essential measuring device for measuring propeller aerodynamic loads. Compared with traditional box balances (or rod balances), a rotating axis balance rotates with the propeller during operation and directly measures propeller loads. In order to examine the dynamic characteristics of a rotating axis balance, it is necessary to simulate the actual working state of the balance, apply dynamic loads under high speed conditions, and evaluate the balance measurement performance.

[0004] When the rotating shaft balance is working, it is both a measuring device and a connecting component, transmitting the driving force of the power source to the propeller and sensing the load of the propeller. Generally, the propeller load includes six components: radial force Fy, Fz, bending moment My, Mz, tension Fx and torque Mx. Patent document CN 106404342 B discloses a currently most commonly used dynamic load application scheme for a propeller rotating shaft balance, which can perform dynamic load loading of radial force Fy, Fz, bending moment My, Mz, and tension Fx.

[0005] According to relevant industry standards and specifications, the calibration of wind tunnel balances requires single component loading of each component of the balance and comprehensive loading of multiple components. The existing dynamic calibration device for rotating axis balances lacks the following functions:

[0006] (1) Mx component loading test. The existing technical solutions lack the Mx loading function and cannot evaluate the measurement performance of the Mx component of the calibrated rotating axis balance.

[0007] (2) Multi-component comprehensive loading test. The existing technical solutions lack the loading function under the condition of Mx combined with other components, and cannot evaluate the measurement performance of the rotating axis balance under this condition. However, the performance evaluation under this condition is often more important, because during the propeller wind tunnel test, the propeller load includes at least the tension Fx and torque Mx components, and the rotating axis balance needs to measure the tension Fx and torque Mx at the same time.

[0008] Therefore, the existing technical solutions can only perform five-component dynamic load application and measurement performance evaluation except torque, which is different from the actual working state of the rotating axis balance and cannot fully and adequately evaluate its performance. Summary of the invention

[0009] The purpose of the present invention is to provide a six-component dynamic calibration load application device for a rotating axis balance in view of the above-mentioned deficiencies, which solves the problem that the prior art can only perform five-component dynamic load application and measurement performance evaluation except torque, which is different from the actual working state of the rotating axis balance and cannot fully and adequately evaluate its performance.

[0010] The present invention is achieved through the following scheme:

[0011] A six-component dynamic calibration load application device for a rotating shaft balance, including at least but not limited to an output shaft, a rotating shaft balance, a loading head, an elastic coupling, a connecting shaft, a torque meter and a load motor; the output shaft is connected to the rotating shaft balance, the rotating shaft balance is connected to the loading head, a plurality of force application positions are arranged on the loading head, the elastic coupling is connected to the connecting shaft, the output end of the load motor is connected to the torque meter, and the torque meter is connected to the connecting shaft.

[0012] Based on the structure of the above-mentioned six-component dynamic calibration load application device for a rotating axis balance, the loading head includes an inner shaft, an outer cylinder and an angular contact ball bearing; the inner shaft is provided with a straight rod portion that cooperates with the outer cylinder and a flange portion that is connected to the rotating axis balance; the outer cylinder is coaxially sleeved on the straight rod portion through an angular contact ball bearing, and an arm and a support for fixing part of the force application position are provided on the outer cylinder.

[0013] Based on the structure of the above-mentioned six-component dynamic calibration load application device for a rotating axis balance, the support arms are symmetrically arranged along the length direction of the straight rod portion, the supports are respectively arranged on the outer cylinder, cross hinges are arranged at positions on the support arms away from the outer cylinder and on the supports, and hanging points are arranged on the cross hinges.

[0014] Based on the structure of the above-mentioned six-component dynamic calibration load application device of the rotating axis balance, a first support, a second support, a third support and a fourth support are respectively arranged along the circumferential position of the outer cylinder, and the first support, the second support, the third support and the fourth support are all in the same plane, wherein the second support and the fourth support are respectively in the same plane with the support arms on the end faces where they are located, and a fifth support is also arranged on the outer cylinder, the fifth support and the third support are in the same plane, and the fifth support is arranged at a predetermined distance from the third support; a first hanging point, a second hanging point, a third hanging point, a fourth hanging point and a fifth hanging point are respectively arranged on the first support, the second support, the third support, the fourth support and the fifth support; a sixth hanging point and a seventh hanging point are respectively arranged at the ends of the two arms; each hanging point and the support at its position are connected by a cross hinge.

[0015] Based on the structure of the above-mentioned six-component dynamic calibration load application device for a rotating axis balance, an OXYZ load application coordinate system is established in the loading head, wherein the Y axis is along the direction of the line connecting the first hanging point and the third hanging point, the Z axis is along the direction of the line connecting the second hanging point and the fourth hanging point, and the X axis is along the direction of the rotation axis;

[0016] Ignoring the residual load transmitted by the elastic coupling, a six-component standard load F1 is applied to the balance. F1 includes Fx1, Fy1, Fz1, Mx1, My1, and Mz1. The corresponding relationship between the load at each hanging point and the output torque of the load motor is as follows:

[0017] Fx1=m6th hanging point+m7th hanging point

[0018] Fy1=mfirst hanging point-mthird hanging point-mfifth hanging point

[0019] Fz1=m2nd hanging point - m4th hanging point (1)

[0020] Mx1=Ms

[0021] My1=(m7th hanging point-m6th hanging point)×0.5×L7th hanging point / 6th hanging point

[0022] Mz1=mfifth hanging point×Lfifth hanging point / third hanging point

[0023] In formula (1),

[0024] m the i-th hanging point (i = 1, 2, ..., 7) – the load applied to the force hanging point i;

[0025] L7th hanging point / 6th hanging point – the distance between the centers of the seventh hanging point and the sixth hanging point;

[0026] L Fifth hanging point / third hanging point – the distance between the centers of the fifth hanging point and the third hanging point;

[0027] Ms——Torque applied by the load motor measured by the torque meter;

[0028] According to formula (1), a single-component load or a multi-component standard load F1 is applied to the rotating axis balance, and the actual measurement value of the rotating axis balance is F2, which includes Fx2, Fy2, Fz2, Mx2, My2, and Mz2; therefore, the component measurement error of the rotating axis balance is:

[0029] S = (F2-F1) / F1 (2)

[0030] According to formula (2), the dynamic measurement error of each component of the rotating axis balance can be calculated, the measurement accuracy of each component can be evaluated, and a report on the measurement accuracy level of the rotating axis balance can be issued.

[0031] The Mx application capacity is adjusted by changing the power of the load motor, and the My and Mz application capacities are achieved by adjusting the distance between the corresponding force application points.

[0032] Based on the structure of the above-mentioned six-component dynamic calibration load application device of a rotating axis balance, two angular contact ball bearings are arranged between the inner shaft and the outer cylinder, adjacent angular contact ball bearing brackets are provided with sleeve cups, the sleeve cups are coaxially sleeved on the straight rod portion, an end cover is also arranged on the end of the outer cylinder away from the flange portion, and a sealing ring is arranged on the contact portion between the straight rod portion and the flange portion.

[0033] Based on the structure of the above-mentioned six-component dynamic calibration load application device for a rotating axis balance, a sleeve matching with the straight rod portion is arranged on the end of the elastic coupling close to the loading head, a connecting groove is arranged on the sleeve, the straight rod portion and the connecting groove are connected by screws, the sleeve and the elastic coupling are connected by expansion connection, a spline groove is arranged on the end of the elastic coupling away from the loading head, and the elastic coupling and the connecting shaft are connected by a spline rod.

[0034] Based on the structure of the above-mentioned six-component dynamic calibration load applying device for a rotating shaft balance, the output shaft is connected to the inner ring of the rotating shaft balance through a nut, and the outer ring of the rotating shaft balance is connected to the flange part through screws.

[0035] Based on the structure of the above-mentioned six-component dynamic calibration load application device for a rotating shaft balance, a flange head is provided on the end of the connecting shaft away from the elastic coupling, the torque meter is connected to the connecting shaft through a flange, and the output end of the load motor is also connected to the input end of the torque meter through a flange.

[0036] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0037] This scheme provides a structural scheme of a six-component dynamic load application device for a rotating axis balance, which can perform individual loading of the six components Fy, Fz, My, Mz, Fx, and Mx, as well as comprehensive loading of any combination of two or three components, and can fully, realistically, and comprehensively simulate the actual working state of the rotating axis balance, and accurately predict and evaluate the measurement performance of each component of the balance. This scheme introduces an elastic coupling between the loading head and the load motor, and through the decoupling effect of the coupling, it is ensured that when the load is loaded on the force application point of the loading head, most of it is transferred to the calibrated balance, ensuring the accuracy of the applied load. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall three-dimensional structure of this scheme;

[0039] Figure 2 It is a schematic diagram of the cross-sectional structure of the overall scheme;

[0040] Figure 3 It is a schematic diagram of the three-dimensional structure of the loading head in this scheme;

[0041] Figure 4 It is a schematic diagram of the cross-sectional structure of the loading head in this scheme;

[0042] : 1. output shaft; 2. rotating shaft balance; 3. loading head; 4. elastic coupling; 5. connecting shaft; 6. torque meter; 7. load motor; 31. inner shaft; 32. outer cylinder; 33. angular contact ball bearing; 34. end cover; 35. sleeve cup; 36. sealing ring; 37. support arm; 38. cross hinge; 39. sleeve; 310. connecting groove; 41. spline groove; 51. spline rod; 52. flange head; 311. flange part; 312. straight rod part; 381. first support; 382. second support; 383. third support; 384. fourth support; 385. fifth support; 391. first hanging point; 392. second hanging point; 393. third hanging point; 394. fourth hanging point; 395. fifth hanging point; 396. sixth hanging point; 397. seventh hanging point. DETAILED DESCRIPTION

[0043] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0044] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other alternative features that are equivalent or have similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0045] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a predetermined direction, be constructed and operated in a predetermined direction, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, the terms "first", "second", etc. 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", "second", etc. may explicitly or implicitly include one or more of the features.

[0047] Example 1

[0048] like Figure 1~Figure 4 The present invention provides a technical solution:

[0049] A six-component dynamic calibration load application device for a rotating axis balance, which at least includes but is not limited to an output shaft 1, a rotating axis balance 2, a loading head 3, an elastic coupling 4, a connecting shaft 5, a torque meter 6 and a load motor 7; the output shaft 1 is connected to the rotating axis balance 2, and the rotating axis balance 2 is connected to the loading head 3; a plurality of force application positions are arranged on the loading head 3, the elastic coupling 4 is connected to the connecting shaft 5, the output end of the load motor 7 is connected to the torque meter 6, and the torque meter 6 is connected to the connecting shaft 5.

[0050] Based on the above structure, when the rotating axis balance 2 is dynamically calibrated: the output shaft 1, the rotating axis balance 2, the inner shaft 31, the elastic coupling 4, the connecting shaft 5, the torque meter 6, and the load motor 7 form a rotating axis system that rotates synchronously; the outer cylinder 32 is relatively stationary; the load motor 7 is used to apply a dynamic torque load to the rotating axis balance 2, and the standard torque value is measured in real time by the torque meter 6, so as to achieve accurate application of the torque Mx load, and at the same time, five components of radial force Fy, Fz, bending moment My, Mz and tension Fx can be applied to the rotating axis balance 2 through multiple force application positions on the loading head 3, so as to achieve six-component load application. Through this solution, a six-component load can be applied to the balance under the condition of high-speed rotation of the rotating axis balance 2, and it has the functions of six-component single-component loading and multi-component comprehensive loading. At the same time, it can also truly simulate the actual working state of the rotating axis balance 2, evaluate the measurement performance of the six components, and make the evaluation result more accurate, comprehensive and reliable.

[0051] As an example, the loading head 3 may include an inner shaft 31, an outer cylinder 32 and an angular contact ball bearing 33; the inner shaft 31 is provided with a straight rod portion 312 matched with the outer cylinder 32 and a flange portion 311 connected to the rotating axis balance 2; the outer cylinder 32 is coaxially sleeved on the straight rod portion 312 through the angular contact ball bearing 33, and an arm 37 and a support for fixing a part of the force application position are provided on the outer cylinder 32;

[0052] The support arms 37 are symmetrically arranged along the length direction of the straight rod portion 312, and the supports are respectively arranged on the outer cylinder 32. A cross hinge 38 is arranged at a position of the support arm 37 away from the outer cylinder 32 and on the support, and a hanging point is arranged on the cross hinge 38.

[0053] Based on the above structure, the distance between the force application positions on both sides is extended by the support arm 37, so that it can apply tension Fx and bending moment My to the rotating axis balance 2 through the hanging points thereon, and the remaining hanging points can respectively apply radial forces Fy, Fz and bending moment Mz to the rotating axis balance 2.

[0054] As an example, a first support 381, a second support 382, ​​a third support 383 and a fourth support 384 are respectively arranged along the circumferential position of the outer cylinder, and the first support 381, the second support 382, ​​the third support 383 and the fourth support 384 are all in the same plane, wherein the second support 382 and the fourth support 384 are respectively in the same plane with the support arms 37 on the end surfaces where they are located, and a fifth support 385 is also arranged on the outer cylinder, and the fifth support 385 and the third support 383 are in the same plane, and the fifth support 385 is arranged at a predetermined distance from the third support 383;

[0055] The first hanging point 391, the second hanging point 392, the third hanging point 393, the fourth hanging point 394 and the fifth hanging point 395 are respectively arranged on the first support 381, the second support 382, ​​the third support 383, the fourth support 384 and the fifth support 385; the sixth hanging point 396 and the seventh hanging point 397 are respectively arranged at the ends of the two arms 37; each hanging point and the support at its position are connected by a cross hinge 38.

[0056] Based on the above structure, in this scheme, the application of tension Fx and bending moment My is achieved through the sixth hanging point 396 and the seventh hanging point 397, the application of radial force Fy and bending moment Mz is achieved through the first hanging point 391, the third hanging point 393 and the fifth hanging point 395, the application of radial force Fz is achieved through the second hanging point 392 and the fourth hanging point 394, and the application of each component load is achieved through the combination of different hanging points in this scheme.

[0057] As an example, two angular contact ball bearings 33 are arranged between the inner shaft 31 and the outer tube 32, and adjacent angular contact ball bearing 33 brackets are provided with sleeve cups 35, which are coaxially sleeved on the straight rod portion 312. An end cover 34 can also be arranged on the end of the outer tube 32 away from the flange portion 311, and a sealing ring 36 is arranged on the contact portion between the straight rod portion 312 and the flange portion 311.

[0058] Based on the above structure, two angular contact ball bearings 33 can make the inner shaft 31 rotate at high speed while keeping the outer cylinder 32 stationary relative to the ground, so as to facilitate the application of load through various hanging points. At the same time, the preload force of the angular contact ball bearing 33 can be adjusted through the end cover 34 and the sleeve cup 35 to make the whole more compact and stable. The present scheme also adopts a sealing ring 36 to seal the bearing lubricating oil.

[0059] As an example, the output shaft 1 is connected to the inner ring of the rotating shaft balance 2 via a nut, and the outer ring of the rotating shaft balance 2 is connected to the flange portion 311 via screws. In this way, the output shaft 1, the rotating shaft balance 2 and the loading head 3 can be connected as a whole.

[0060] As an example, a sleeve 39 that cooperates with the straight rod portion 312 is provided on the end of the elastic coupling 4 close to the loading head 3, and a connecting groove 310 is provided on the sleeve 39. The straight rod portion 312 and the connecting groove 310 are connected by screws. The sleeve 39 and the elastic coupling 4 are connected by expansion connection. A spline groove 41 is provided on the end of the elastic coupling 4 away from the loading head 3, and the elastic coupling 4 is connected to the connecting shaft 5 by a spline rod 51.

[0061] Based on the above structure, the elastic coupling 4 has a double set of diaphragms, which are flexible in the X, Y and Z directions, and can compensate for the concentricity error between the inner shaft 31 and the connecting shaft 5, thereby improving the stability of the operation of the rotating shaft system; at the same time, it also has a decoupling function. When a load is applied to the force application points in the +Y, -Y, +Z, -Z, +X and -X directions, most of the load is transmitted to the outer cylinder 32, and then transmitted to the rotating shaft balance 2 through the angular contact ball bearing 33 and the inner shaft 31. Only a small part of the residual load is transmitted to the connecting shaft 5. At the same time, the elastic coupling 4 is connected to the connecting shaft 5 by a spline, so that the connecting shaft 5 can slide freely in a specified direction relative to the elastic coupling 4.

[0062] As an example, a flange head 52 may be provided on the end of the connecting shaft 5 away from the elastic coupling 4 , the torque meter 6 is connected to the flange end of the connecting shaft 5 , and the output end of the load motor 7 is also flange-connected to the input end of the torque meter 6 .

[0063] As an example, an OXYZ load application coordinate system is established in the loading head 3, the Y axis is along the direction of the line connecting the first hanging point 391 and the third hanging point 393, the Z axis is along the direction of the line connecting the second hanging point 392 and the fourth hanging point 394, and the X axis is along the direction of the rotation axis;

[0064] Ignoring the residual load transmitted by the elastic coupling 4, the corresponding relationship between the six-component standard load F1 (Fx1, Fy1, Fz1, Mx1, My1, Mz1) applied to the balance and the loads of each hanging point and the output torque of the load motor 7 is: (radial force Fy, Fz, bending moment My, Mz, tension Fx and torque Mx six components)

[0065] Fx1=m6th hanging point+m7th hanging point

[0066] Fy1=mfirst hanging point-mthird hanging point-mfifth hanging point

[0067] Fz1=m2nd hanging point - m4th hanging point (1)

[0068] Mx1=Ms

[0069] My1=(m7th hanging point-m6th hanging point)×0.5×L7th hanging point / 6th hanging point

[0070] Mz1=mfifth hanging point×Lfifth hanging point / third hanging point

[0071] In formula (1),

[0072] m the i-th hanging point (i = 1, 2, ..., 7) – the load applied to the force hanging point i;

[0073] L7th hanging point / 6th hanging point – the distance between the centers of the seventh hanging point and the sixth hanging point;

[0074] L Fifth hanging point / third hanging point – the distance between the centers of the fifth hanging point and the third hanging point;

[0075] Ms——Torque applied by load motor 7 measured by torque meter 6.

[0076] According to formula (1), a single-component load or a multi-component standard load F1 (Fx1, Fy1, Fz1, Mx1, My1, Mz1) can be applied to the rotating axis balance 2, and the actual measurement value of the rotating axis balance 2 is F2 (Fx2, Fy2, Fz2, Mx2, My2, Mz2). Therefore, the component measurement error of the rotating axis balance 2 is:

[0077] S = (F2-F1) / F1 (2)

[0078] According to formula (2), the dynamic measurement error of each component of the rotating axis balance 2 can be calculated, the measurement accuracy of each component can be evaluated, and a report on the measurement accuracy level of the rotating axis balance 2 can be issued.

[0079] The Mx application capacity can be adjusted by changing the power of the load motor 7, and the My and Mz application capacities can be achieved by adjusting the distances between the corresponding force application hanging points.

[0080] Specifically, this solution sets five supports, namely, one in the +Y direction, two in the -Y direction, one in the +Z direction, and one in the -Z direction.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A six-component dynamic calibration load application device for a rotating axis balance, characterized in that: It includes an output shaft, a rotating shaft balance, a loading head, an elastic coupling, a connecting shaft, a torque meter and a load motor; the output shaft is connected to the rotating shaft balance, and the rotating shaft balance is connected to the loading head; a plurality of force application positions are arranged on the loading head, the elastic coupling is connected to the connecting shaft, the output end of the load motor is connected to the torque meter, and the torque meter is connected to the connecting shaft; the loading head includes an inner shaft, an outer cylinder and an angular contact ball bearing; a straight rod portion cooperating with the outer cylinder and a flange portion connected to the rotating shaft balance are arranged on the inner shaft; the outer cylinder is coaxially sleeved on the straight rod portion through an angular contact ball bearing, and an arm and a support for fixing part of the force application positions are arranged on the outer cylinder; the arm is symmetrically arranged along the length direction of the straight rod portion, and the supports are respectively arranged on the outer cylinder, and the positions of the arm far away from the outer cylinder and the support A cross hinge is arranged on each seat, and a hanging point is arranged on the cross hinge; a first support, a second support, a third support and a fourth support are arranged along the circumferential position of the outer cylinder, respectively, the first support, the second support, the third support and the fourth support are all in the same plane, wherein the second support and the fourth support are respectively in the same plane with the support arms on the end faces where they are located, and a fifth support is also arranged on the outer cylinder, the fifth support and the third support are in the same plane, and the fifth support is arranged at a predetermined distance from the third support; a first hanging point, a second hanging point, a third hanging point, a fourth hanging point and a fifth hanging point are respectively arranged on the first support, the second support, the third support, the fourth support and the fifth support; a sixth hanging point and a seventh hanging point are respectively arranged at the ends of the two arms; each hanging point is connected to the support at its position by a cross hinge.

2. A six-component dynamic calibration load application device for a rotating axis balance according to claim 1, characterized in that: An OXYZ load application coordinate system is established in the loading head, wherein the Y axis is along the direction of the line connecting the first hanging point and the third hanging point, the Z axis is along the direction of the line connecting the second hanging point and the fourth hanging point, and the X axis is along the direction of the rotation axis; Ignoring the residual load transmitted by the elastic coupling, the six-component standard load F1 applied to the balance, F1 includes Fx1, Fy1, Fz1, Mx1, My1, Mz1 and the corresponding relationship between the load of each hanging point and the output torque of the load motor is: Fx1=m6th hanging point+m7th hanging point; Fy1=mfirst hanging point-mthird hanging point-mfifth hanging point; Fz1=m2nd hanging point - m4th hanging point; Mx1=Ms; My1=(m7th hanging point - m6th hanging point)×0.5×L7th hanging point / 6th hanging point; Mz1=mfifth hanging point×Lfifth hanging point / third hanging point; In the formula, m the i-th hanging point, i = 1, 2, ..., 7 - the load applied to the force hanging point i; L7th hanging point / 6th hanging point – the distance between the centers of the seventh hanging point and the sixth hanging point; L Fifth hanging point / third hanging point – the distance between the centers of the fifth hanging point and the third hanging point; Ms——Torque applied by the load motor measured by the torque meter; According to the above formula, a single-component load or a multi-component standard load F1 is applied to the rotating axis balance, and the actual measurement value of the rotating axis balance is F2, which includes Fx2, Fy2, Fz2, Mx2, My2, and Mz2; therefore, the component measurement error of the rotating axis balance is: S=(F2-F1) / F1; According to the above formula, the dynamic measurement error of each component of the rotating axis balance is calculated, the measurement accuracy of each component is evaluated, and a report on the measurement accuracy level of the rotating axis balance is issued.

3. A six-component dynamic calibration load application device for a rotating axis balance as claimed in claim 2, characterized in that: The Mx application capacity is adjusted by changing the power of the load motor, and the My and Mz application capacities are achieved by adjusting the distances between the corresponding force application points.

4. A six-component dynamic calibration load application device for a rotating axis balance according to any one of claims 1 to 3, characterized in that: Two angular contact ball bearings are arranged between the inner shaft and the outer cylinder, and adjacent angular contact ball bearing brackets are provided with sleeve cups, which are coaxially sleeved on the straight rod portion. An end cover is also arranged on the end of the outer cylinder away from the flange portion, and a sealing ring is arranged on the contact portion between the straight rod portion and the flange portion.

5. A six-component dynamic calibration load application device for a rotating axis balance according to any one of claims 1 to 3, characterized in that: A shaft sleeve matching with the straight rod portion is arranged on the end of the elastic coupling close to the loading head, a connecting groove is arranged on the shaft sleeve, the straight rod portion and the connecting groove are connected by screws, the shaft sleeve and the elastic coupling are connected by expansion connection, a spline groove is arranged on the end of the elastic coupling away from the loading head, and the elastic coupling and the connecting shaft are connected by a spline rod.

6. A six-component dynamic calibration load application device for a rotating axis balance according to any one of claims 1 to 3, characterized in that: The output shaft is connected to the inner ring of the rotating shaft balance through a nut, and the outer ring of the rotating shaft balance is connected to the flange part through screws.

7. A six-component dynamic calibration load application device for a rotating axis balance according to any one of claims 1 to 3, characterized in that: A flange head is arranged on the end of the connecting shaft away from the elastic coupling, the torque meter is flange-connected to the connecting shaft, and the output end of the load motor is also flange-connected to the input end of the torque meter.

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