Electro-hydraulic load excitation simulation device and system

Abstract

The utility model provides an electro-hydraulic-based load excitation simulation device and system, and belongs to the technical field of whole helicopter transfer function tests, in the device, an inner bearing frame is fixedly connected with a clamped beam through a transition adjusting beam, one end of an electro-hydraulic vibration exciter is hinged to a vibration exciter mounting fork lug, and the other end of the electro-hydraulic vibration exciter is hinged to a vibration exciter mounting fork lug. The other end of the inner bearing frame is connected with a first load sensor, and the first load sensor is further hinged to an equilateral rocker arm through a double-fork lug; the center of the equilateral rocker arm is hinged to the inner force bearing frame to form an inner force bearing structure. The two ends of the equilateral rocker arm are hinged to the two shock excitation rods respectively, and the lower ends of the shock excitation rods are hinged to the shock excitation rod mounting fork lugs. The excitation rod mounting fork lug is fixedly mounted on the loading beam, and the loading beam is fixedly connected with the upper end of the propeller hub; a couple moment working environment load at the center of a helicopter propeller hub can be simulated; and the couple moment load in a real environment can be applied to the center of the propeller hub, so that the couple moment at the position of the helicopter propeller hub can be simulated more truly.

Description

Technical Field

[0001] The utility model belongs to the technical field of helicopter full-aircraft transfer function tests, and particularly relates to a load excitation simulation device and system based on an electro-hydraulic type. Background Art

[0002] Compared with other aircraft, the working environment of a helicopter is very complex, which is attributed to the special dynamic structure characteristics of the helicopter. The helicopter rotor is not a simple periodically rotating component. In order to maintain stable and controllable flight, the main rotor needs to perform various actions according to the flight control instructions, thereby transmitting a series of complex combined loads to the hub center to keep the airframe flying stably and controllably. These loads play an important role in maintaining the normal flight of the aircraft, but they will also be transmitted to various parts of the airframe structure, thus affecting the use experience of passengers and the functions and service lives of airborne equipment. In order to improve the working environment of the helicopter cockpit and cabin, ensure that the airborne equipment is in good operating condition, and extend its service life, it is necessary to conduct transfer function tests on the helicopter before and after its first flight. Through the tests, the transfer rate from the hub center to the key parts of the airframe structure is obtained, providing data support for the subsequent optimization layout and improvement of the airframe structure. During the full-aircraft transfer function test process, the simulation of the working load environment at the hub center is particularly important, because the distortion of the test simulation load may seriously affect the test data, thus affecting the subsequent optimization and improvement work of the helicopter. Among all the load conditions simulated at the helicopter hub center, the simulation of the couple moment is the most complex, and its influence on the test data is also relatively large, because the couple moment simulation involves two loading points, and the two-point loading needs to be strictly synchronized and reversed during the test process.

[0003] In the related technology, an electromagnetic exciter is usually used to simulate the couple moment loading. However, with the successful development of new models, the disadvantages of this traditional test loading method have been gradually magnified, and even affected the development of the transfer function test technology. First of all, with the increase in the helicopter tonnage, the loading force of the electromagnetic exciter can no longer meet the requirements of the test loading magnitude, and it is urgent to develop an exciter device with a larger couple moment loading tonnage; secondly, when using the electromagnetic exciter to simulate the couple moment loading, there is usually a serious phase overshoot phenomenon in the low-frequency range of the couple moment, which makes the test data lack reliability; finally, there is a certain instability in the synchronous control of the couple moment using the electromagnetic exciter, and some local airframe frequencies often interfere with or even interrupt the test. Content of the Utility Model

[0004] To solve the technical problems in the related art that the electromagnetic exciter cannot meet the requirements of the test loading magnitude when simulating the couple moment loading, the test data lacks reliability, and there is a certain instability, the present utility model provides a load excitation simulation device and system based on electro-hydraulic, which can realize the simulation of the couple moment load in the working environment of the helicopter hub, mainly involving the adjustment and installation of the load simulation device, the loading control and the load environment simulation, and realizing and improving the test requirements for the helicopter transfer function test. The technical solutions are as follows:

[0005] In the first aspect, a load excitation simulation device based on electro-hydraulic is provided, including: a fixed support beam 1, a transition adjustment beam 2, an inner bearing frame 3, an exciter mounting fork ear 4, an electro-hydraulic exciter 5, a first load sensor 6, an equilateral rocker arm 7, an excitation rod 8, an excitation rod mounting fork ear 9, and a loading beam 10.

[0006] The inner bearing frame 3 is fixedly connected to the fixed support beam 1 through the transition adjustment beam 2.

[0007] One end of the electro-hydraulic exciter 5 is hinged to the exciter mounting fork ear 4 and is fixedly installed on the inner bearing frame 3 through the mounting fork ear 4, and the other end is connected to the first load sensor 6. The first load sensor 6 is also hinged to the equilateral rocker arm 7 through a double fork ear.

[0008] The center of the equilateral rocker arm 7 is hinged to the inner bearing frame 3 to form an inner bearing structure; both ends of the equilateral rocker arm 7 are respectively hinged to two excitation rods 8, and the lower end of the excitation rod 8 is hinged to the excitation rod mounting fork ear 9; the excitation rod mounting fork ear 9 is fixedly installed on the loading beam 10, and the loading beam 10 is fixedly connected to the upper end of the hub 11.

[0009] Among them, the excitation rod 8 includes: an upper connecting rod 8-1, an adjusting threaded rod 8-3, a middle connecting rod 8-4, a second load sensor 8-5, and a lower connecting rod 8-6.

[0010] The upper connecting rod 8-1 is sequentially screwed together with the adjusting threaded rod 8-3, the middle connecting rod 8-4, the second load sensor 8-5, and the lower connecting rod 8-6.

[0011] Among them, the screwed joints of the upper connecting rod 8-1 with the adjusting threaded rod 8-3, the middle connecting rod 8-4, the second load sensor 8-5, and the lower connecting rod 8-6 are all locked and fixed through locking nuts 8-2.

[0012] The lower end of the transition adjustment beam 2 is provided with a transverse chute, and the upper end of the inner bearing frame 3 is provided with a convex structure that can move along the transverse chute.

[0013] Among them, the lower end of the fixed support beam 1 is provided with a longitudinal chute, and the upper end of the transition adjustment beam 2 is provided with a convex structure that can move along the longitudinal chute.

[0014] Second aspect, a load excitation simulation system based on electro-hydraulic is provided, including: the load excitation simulation device based on electro-hydraulic according to any one of the first aspects, a hub 11, and a controller.

[0015] The loading beam 10 of the load excitation simulation device based on electro-hydraulic is fixedly connected to the upper end of the hub 11.

[0016] The controller is electrically connected to the first load sensor 6 and the electro-hydraulic vibrator 5, and is used to control the electro-hydraulic vibrator 5 to push the equilateral rocker arm 7 according to the load signal fed back by the first load sensor 6, drive the excitation rod 8 to move in reverse alternately, and transmit the couple moment to the center of the hub 11 through the mounting fork ear 9 and the loading beam 10, so as to realize the simulation of the couple moment load environment.

[0017] The load excitation simulation device based on electro-hydraulic provided by the utility model can be used to simulate the couple moment working environment load at the center of the helicopter hub, and obtain the transfer function from the center of the hub to the key parts of the airframe structure; it overcomes the problems of small loading magnitude of couple moment simulation in the current laboratory, serious phase deviation in the low-frequency band, and easy influence of loading control by the local modal frequency of the airframe, and can apply the couple moment load in the real environment to the center of the hub, so as to more realistically simulate the couple moment at the helicopter hub. The load excitation simulation device based on electro-hydraulic provided by the utility model is convenient to operate, accurately controlled, and stable in operation, greatly saving the test time and cost, and improving the test efficiency. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the load excitation simulation device based on electro-hydraulic provided by the embodiment of the utility model;

[0019] Figure 2 It is a schematic structural diagram of the excitation rod provided by the embodiment of the utility model. Detailed Embodiment

[0020] The embodiment of the utility model provides a load excitation simulation device based on electro-hydraulic, which can be used to realize the simulation loading of the couple moment at the center of the helicopter hub, mainly involving the adjustment and installation of the load simulation device, loading control and couple moment load environment simulation, so as to meet the test requirements of the helicopter transfer function test. The load excitation simulation device based on electro-hydraulic can be used for the test in the field of helicopter transfer function test of various models, with a wider application range, more stable loading, and more accurate control, which provides certain technical support for improving the quality of helicopter transfer function test data and the subsequent optimization and improvement of the helicopter.

[0021] Please refer to Figure 1, an embodiment of the present utility model provides a load excitation simulation device based on an electro-hydraulic type. The device includes: a fixed support beam 1, a transition adjustment beam 2, an inner load-bearing frame 3, an exciter mounting fork ear 4, an electro-hydraulic exciter 5, a first load sensor 6, an equilateral rocker arm 7, an excitation rod 8, an excitation rod mounting fork ear 9, and a loading beam 10.

[0022] The inner load-bearing frame 3 is fixedly connected to the fixed support beam 1 through the transition adjustment beam 2.

[0023] One end of the electro-hydraulic exciter 5 is hinged to the exciter mounting fork ear 4 and is fixedly installed on the inner load-bearing frame 3 through the mounting fork ear 4, and the other end is connected to the first load sensor 6; the first load sensor 6 is also hinged to the equilateral rocker arm 7 through a double fork ear.

[0024] The center of the equilateral rocker arm 7 is hinged to the inner load-bearing frame 3 to form an inner load-bearing structure; both ends of the equilateral rocker arm 7 are respectively hinged to two excitation rods 8, and the lower end of the excitation rod 8 is hinged to the excitation rod mounting fork ear 9; the excitation rod mounting fork ear 9 is fixedly installed on the loading beam 10, and the loading beam 10 is fixedly connected to the upper end of the hub 11.

[0025] Specifically, please refer to Figure 2 , the excitation rod 8 may include: an upper connecting rod 8-1, an adjusting threaded rod 8-3, a middle connecting rod 8-4, a second load sensor 8-5, and a lower connecting rod 8-6.

[0026] The upper connecting rod 8-1, the adjusting threaded rod 8-3, the middle connecting rod 8-4, the second load sensor 8-5, and the lower connecting rod 8-6 are sequentially screwed together.

[0027] Furthermore, the screwed joints of the upper connecting rod 8-1 with the adjusting threaded rod 8-3, the middle connecting rod 8-4, the second load sensor 8-5, and the lower connecting rod 8-6 are all locked and fixed through lock nuts 8-2.

[0028] In one embodiment, both ends of the adjusting threaded rod 8-3 are provided with left and right hand threads and are respectively threadedly connected to the upper connecting rod 8-1 and the middle connecting rod 8-4. With such a design, the second load sensor 8-5 and the lower connecting rod 8-6 can move along the axial direction of the excitation rod 8, so as to facilitate the vertical movement adjustment of the excitation rod 8.

[0029] The lower end of the transition adjustment beam 2 is provided with a transverse chute, and the upper end of the inner load-bearing frame 3 is provided with a convex structure that can move along the transverse chute. With such a design, the inner load-bearing frame 3 can move horizontally along the transition adjustment beam 2, so as to facilitate the horizontal movement adjustment of the excitation rod 8.

[0030] The lower end of the fixed support beam 1 is provided with a longitudinal chute, and the upper end of the transition adjustment beam 2 is provided with a convex structure that can move along the longitudinal chute. With such a design, the transition adjustment beam 2 can move longitudinally along the fixed support beam 1, so as to facilitate the longitudinal movement adjustment of the excitation rod 8.

[0031] The assembly process of the electro-hydraulic load excitation simulation device provided by the embodiment of the present utility model is as follows:

[0032] 1. Connect the fixed beam 1, the transition adjustment beam 2, the inner load-bearing frame 3, the exciter mounting fork ear 4, the electro-hydraulic exciter 5, the first load sensor 6, the equilateral rocker arm 7, and the excitation rod 8 into a whole. Among them, when selecting the electro-hydraulic exciter 5, select the electro-hydraulic exciter 5 of the corresponding specification according to the requirement of the couple moment load magnitude. One end is hinged to the exciter mounting fork ear 4, and the other end is screwed to the first load sensor 6, and ensure that it is smooth and interference-free within the range of rotational motion;

[0033] 2. Fix the excitation rod mounting fork ear 9 to the loading beam 10, and fix the loading beam 10 to the hub 11, and ensure that the length, stiffness and mass of the loading beam 10 are appropriate;

[0034] 3. Adjust the position of the inner load-bearing frame 3 on the plane to align the lower connecting rod 8-6 of the excitation rod 8 with the excitation rod mounting fork ear 9, and then adjust the adjusting threaded rod 8-3 to change the length of the excitation rod 8, and ensure that the mounting hole of the lower connecting rod 8-6 can be just connected to the excitation rod mounting fork ear 9 to form a whole.

[0035] Connect the test piece, and use the electro-hydraulic load excitation simulation device provided by the embodiment of the present utility model for testing. The specific process is as follows:

[0036] 1. Adjust the longitudinal position of the transition adjustment beam 2 and the fixed beam 1 and the lateral position of the inner load-bearing frame 3 and the transition adjustment beam 2 to align the excitation rod 8 with the excitation rod mounting fork ear 9;

[0037] 2. Adjust the adjusting threaded rod 8-3 to change the length of the excitation rod 8 so that the mounting hole of the lower connecting rod 8-6 can be just connected to the excitation rod mounting fork ear 9;

[0038] 3. The user inputs the target spectrum to the controller, sets the error band, and debugs and runs the electro-hydraulic load excitation simulation device;

[0039] 4. The controller drives the electro-hydraulic exciter 5 to start working based on the target spectrum signal, and at the same time receives the load signal fed back by the first load sensor 6; the controller repeatedly compares the load signal with the preset target load spectrum. When the control accuracy requirement is met, the controller controls the electro-hydraulic exciter 5 to push the equilateral rocker arm 7, drive the excitation rod 8 to move in reverse alternately, and generate an equivalent couple moment through the mounting fork ear 9 and the loading beam 10, and transmit it to the center of the hub 11 to realize the simulation of the couple moment load environment during the operation of the helicopter;

[0040] 5. The data acquisition system collects the force signal of the second load sensor 8-5 on the excitation rod 8 and the response signal on the airframe structure, and processes the data to obtain the transfer function data from the hub center to the key parts of the airframe structure.

[0041] The embodiment of the present utility model further provides a load excitation simulation system based on an electro-hydraulic type, including: Figure 1 The load excitation simulation device based on the electro-hydraulic type shown, as well as the hub 11 and the controller.

[0042] The loading beam 10 of the load excitation simulation device based on the electro-hydraulic type is fixedly connected to the upper end of the hub 11.

[0043] The controller is electrically connected to the first load sensor 6 and the electro-hydraulic actuator 5, and is used to control the electro-hydraulic actuator 5 to push the equilateral rocker arm 7 according to the load signal fed back by the first load sensor 6, drive the excitation rod 8 to move in reverse alternately, and transmit the couple moment to the center of the hub 11 through the mounting fork ear 9 and the loading beam 10, so as to realize the simulation of the couple moment load environment.

[0044] The above only expresses the implementation manners of the present application, and its description is relatively specific and detailed, but it cannot be understood as a limitation on the patent scope. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. In addition, the parts not elaborated in the present application are all conventional technologies.

Claims

1. An electro-hydraulic load excitation simulation device, characterized in that: include: A fixed support beam (1), a transition adjustment beam (2), an inner load-bearing frame (3), a vibration exciter mounting fork ear (4), an electro-hydraulic vibration exciter (5), a first load sensor (6), an equilateral rocker arm (7), a vibration rod (8), a vibration rod mounting fork ear (9), and a loading beam (10). The inner load-bearing frame (3) is fixedly connected to the fixed support beam (1) via a transition adjustment beam (2); one end of the electro-hydraulic vibrator (5) is hinged to the vibrator mounting fork ear (4) and is fixed to the inner load-bearing frame (3) via the mounting fork ear (4); the other end is connected to a first load sensor (6), and the first load sensor (6) is also hinged to an equilateral rocker arm (7) via a double fork ear; The center of the equilateral rocker arm (7) is hinged to the inner load-bearing frame (3) to form an inner load-bearing structure; the two ends of the equilateral rocker arm (7) are respectively hinged to two exciting rods (8), and the lower end of the exciting rod (8) is hinged to the exciting rod mounting fork ear (9); the exciting rod mounting fork ear (9) is fixed on the loading beam (10), and the loading beam (10) is fixedly connected to the upper end of the hub (11).

2. The device according to claim 1, characterized in that The exciting rod (8) comprises an upper connecting rod (8-1), an adjusting threaded rod (8-3), a middle connecting rod (8-4), a second load sensor (8-5), and a lower connecting rod (8-6); the upper connecting rod (8-1) is threadedly connected with the adjusting threaded rod (8-3), the middle connecting rod (8-4), the second load sensor (8-5), and the lower connecting rod (8-6) in sequence.

3. The device according to claim 2, characterized in that The threaded joints between the upper connecting rod (8-1), the adjusting threaded rod (8-3), the middle connecting rod (8-4), the second load sensor (8-5) and the lower connecting rod (8-6) are all locked and fixed by means of locking nuts (8-2).

4. The device according to claim 1, characterized in that A transverse sliding groove is provided at the lower end of the transition adjustment beam (2), and a protruding structure capable of moving along the transverse sliding groove is provided at the upper end of the inner load-bearing frame (3).

5. The device according to claim 1, characterized in that The lower end of the fixed support beam (1) is provided with a longitudinal slide groove, and the upper end of the transition adjustment beam (2) is provided with a protruding structure that can move along the longitudinal slide groove.

6. An electro-hydraulic load excitation simulation system, characterized in that: include: The electro-hydraulic load excitation simulation device, the propeller hub (11), and the controller as described in any one of claims 1 to 5, A loading beam (10) based on an electro-hydraulic load excitation simulation device is fixedly connected to the upper end of a hub (11); The controller is electrically connected to the first load sensor (6) and the electro-hydraulic vibrator (5).

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