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CN-121762161-B - High-speed wind tunnel large-amplitude pitching and yawing coupling movement mechanism and test method

CN121762161BCN 121762161 BCN121762161 BCN 121762161BCN-121762161-B

Abstract

The invention provides a high-speed wind tunnel large-amplitude pitching and yawing coupling movement mechanism and a test method, and belongs to the technical field of wind tunnel special tests. The method aims at solving the problems that in the prior art, an aircraft can disturb a flow field due to tail struts and the size of a moving part is large, the burden of a driving mechanism is increased, and regular oscillation of a model is difficult to realize. The yaw oscillating shaft is connected with a transmission shaft through a bevel gear set, a balance is arranged at the front end of the yaw oscillating shaft, a test model is arranged on the balance, a yaw motor in the connection seat is connected with an inclined speed reducer, and an output shaft of the inclined speed reducer is connected with the transmission shaft. The invention solves the problems that in the prior art, the aircraft can disturb a flow field due to tail struts and the size of a moving part is large, the burden of a driving mechanism is increased, and the regular oscillation of a model is difficult to realize.

Inventors

  • ZHANG JIE
  • PAN JINZHU
  • LI HAIQIN
  • CAI YI
  • XU MING

Assignees

  • 中国航空工业集团公司沈阳空气动力研究所

Dates

Publication Date
20260508
Application Date
20260303

Claims (8)

  1. 1. The high-speed wind tunnel large-amplitude pitching and yawing coupling movement mechanism is characterized by comprising a pitching mechanism (1), a yawing mechanism (2), a test model (3), a balance (4), an umbrella-shaped gear set (9) and a connecting seat (10); The driving shafts at two ends of the pitching mechanism (1) are arranged on the side wall of the wind tunnel and are connected with the external driving mechanism, one end of the yawing mechanism (2) is vertically arranged in the middle of the pitching mechanism (1) through a connecting seat (10), and the other end of the yawing mechanism is connected with the test model (3); The yaw mechanism (2) comprises a model supporting rod (5) and a bevel gear set (9), wherein the model supporting rod (5) further comprises a vertical rod (51) and a main body rod (52), a yaw oscillating shaft (11) arranged in the vertical rod (51) is connected with a transmission shaft (6) in the main body rod (52) through the bevel gear set (9), a balance (4) is arranged at the front end of the yaw oscillating shaft (11), and a test model (3) is arranged on the balance (4); The yaw motor (7) in the connecting seat (10) is connected with the inclined speed reducer (8), and an output shaft of the inclined speed reducer (8) is connected with the transmission shaft (6).
  2. 2. The high-speed wind tunnel large-amplitude pitching and yawing coupling motion mechanism according to claim 1, wherein the umbrella-shaped gear set (9) comprises a first gear (12) and a second gear (13), the first gear (12) is mounted on a yawing oscillating shaft (11), the second gear (13) is mounted on a transmission shaft (6), and the first gear (12) and the second gear (13) are meshed.
  3. 3. A high-speed wind tunnel large-amplitude pitching and yawing coupling motion mechanism according to claim 2, wherein the first gear (12) and the second gear (13) are both helical gears.
  4. 4. The high-speed wind tunnel large-amplitude pitching and yawing coupling motion mechanism according to claim 2, wherein the yawing oscillating shaft (11) and the transmission shaft (6) are connected with the vertical rod (51) and the main body rod (52) through bearings.
  5. 5. The high-speed wind tunnel large-amplitude pitching and yawing coupling motion mechanism according to claim 4, wherein the balance (4) is coincident with the axis of the test model (3), and the balance and the axis of the yawing oscillating shaft (11) and the axis of the vertical rod (51) are mutually perpendicular.
  6. 6. The high-speed wind tunnel large-amplitude pitching and yawing coupling motion mechanism according to claim 1, wherein the angles between the vertical rod (51) and the main body rod (52) and between the output shaft of the inclined speed reducer (8) and the transmission shaft (6) are 60-70 degrees.
  7. 7. The high-speed wind tunnel large-amplitude pitching and yawing coupling motion mechanism according to claim 1, wherein the output rotation of the yawing motor (7) is sinusoidal, and the rotation transmitted to the transmission shaft (6) is sinusoidal oscillation.
  8. 8. The test method of the high-speed wind tunnel large-amplitude pitching and yawing coupling movement mechanism of claim 2, which specifically comprises the following steps: S1, installing a pitching mechanism (1), namely installing the pitching mechanism (1) on the rotating windows of the wall plates at the two sides of the wind tunnel, and adjusting the wall plates to be horizontal; s2, installing a connecting seat (10), namely installing the connecting seat (10) on the pitching mechanism (1), then connecting the yaw motor (7) with the inclined speed reducer (8), and installing the yaw motor in the connecting seat (10); S3, installing a yaw mechanism (2), namely installing a main body rod (52) on a connecting seat (10), placing a transmission shaft (6) in the main body rod (52), connecting one end of the transmission shaft (6) with an output shaft of an inclined speed reducer (8), and installing a second gear (13) at the other end of the transmission shaft, wherein a yaw oscillating shaft (11) is connected with a first gear (12) and then installed in a vertical rod (51), and the first gear (12) is meshed with the second gear (13); S4, a balance (4) is arranged at the front end of a yaw oscillating shaft (11), a test model (3) is arranged on the balance (4), and the test device is arranged at the moment; S5, determining a test working condition, starting a wind tunnel, adjusting the device to an attack angle required by a test through a wind tunnel rotating window, and waiting for a flow field to be stable; S6, starting a pitching mechanism (1) and a yawing mechanism (2), driving the pitching mechanism (1) to do pitching motion integrally by an external driving mechanism, and driving a test model (3) to do yawing motion by a yawing motor (7) sequentially through an inclined speed reducer (8), a transmission shaft (6), an umbrella-shaped gear set (9) and a yawing oscillating shaft (11), wherein the movement frequency of the pitching mechanism (1) is the same as that of the yawing mechanism (2), so that the pitching and yawing coupling large-scale movement of the test model (3) is realized; s7, after the movement is stable, acquiring data of a balance (4); s8, after the test is completed, returning the device to an initial state, and stopping the wind tunnel; S9, repeating the steps S5-S8, and collecting aerodynamic force data of the test model (3) under the condition of pitching and yawing coupling large-scale movement under different working conditions.

Description

High-speed wind tunnel large-amplitude pitching and yawing coupling movement mechanism and test method Technical Field The invention belongs to the technical field of wind tunnel special tests, and particularly relates to a high-speed wind tunnel large-amplitude pitching and yawing coupling movement mechanism and a test method. Background The large-amplitude oscillation test is a special wind tunnel test, and the motion mechanism drives the test model to do large-amplitude angular oscillation at a certain balance position. Typically the angular vibration amplitude is not less than 20 °. Vibration direction pitch, yaw and roll. In general, in a high-speed wind tunnel, single-degree-of-freedom vibration is mainly adopted, namely, a test model only performs certain single oscillating motion of pitching, yawing or rolling. However, with the development of aircrafts, the aerodynamic force of the aircrafts has a strong multi-degree-of-freedom coupling effect in the motion process, and the test method for measuring the aerodynamic force by only single-degree-of-freedom motion simulation has obvious defects, so that wind tunnel test technology research of double-degree-of-freedom motion simulation is urgently needed. The conventional double-degree-of-freedom coupling motion test has pitching and rolling coupling and pitching and yawing coupling, and the design thought of the test mechanism is generally that pitching motion is realized firstly, then rolling motion or yawing motion of a model is realized on the basis of the pitching mechanism, and the motion mechanism is generally characterized in that the test model is fixed relative to the supporting rod, and the supporting rod drives the model to move together. Taking pitching and yawing movements as examples, the pitching and yawing movements are usually in a series movement mode, the primary movement mechanism realizes pitching movement and drives the whole mechanism and the model to do pitching movement, and on the basis, the secondary movement mechanism (yawing movement mechanism) drives the model support rod to do yawing movement, and finally, the pitching and yawing two-degree-of-freedom coupling movement is realized. In the high-speed wind tunnel test process, the model is stressed more and the flow field is more complex, so when the model and the tail support rod integrally do pitching and yawing two-degree-of-freedom motions, the tail support rod can generate obvious disturbance on the flow field in the process of doing large-scale motion, meanwhile, the structural size of a moving part is larger, the burden of a driving mechanism can be increased, and the regular oscillation of the model can not be met sometimes. In view of the above, it is highly desirable to design a high-speed wind tunnel large-amplitude pitching and yawing coupling movement mechanism and a test method, which solve the problem that in the prior art, an aircraft can greatly increase the burden of a driving mechanism due to the disturbance flow field of a tail support rod and the size of a movement part in the high-speed wind tunnel, and the model regular oscillation is difficult to realize. Disclosure of Invention The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later. In view of the above, the invention provides a high-speed wind tunnel large-amplitude pitching and yawing coupling movement mechanism and a test method, which can solve the problems that in the prior art, an aircraft can greatly increase the load of a driving mechanism due to the disturbance flow field of a tail support rod and the size of a movement part, and the regular oscillation of a model is difficult to realize. The scheme one is that the high-speed wind tunnel greatly pitching and yawing coupling motion mechanism comprises a pitching mechanism, a yawing mechanism, a test model, a balance, a bevel gear set and a connecting seat; The driving shafts at two ends of the pitching mechanism are arranged on the side wall of the wind tunnel and connected with the external driving mechanism, one end of the yawing mechanism is vertically arranged in the middle of the pitching mechanism through a connecting seat, and the other end of the yawing mechanism is connected with the test model; the yaw mechanism comprises a model support rod and a bevel gear set, wherein the model support rod further comprises a vertical rod and a main body rod, a yaw oscillating shaft arranged in the vertical rod is connected with a transmission shaft in the main body rod through the bevel gear set, a balance is arranged at the front e