CN115343052A - High-precision parallel-type grating finger distortion generator driving device and method - Google Patents
High-precision parallel-type grating finger distortion generator driving device and method Download PDFInfo
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- CN115343052A CN115343052A CN202211267546.4A CN202211267546A CN115343052A CN 115343052 A CN115343052 A CN 115343052A CN 202211267546 A CN202211267546 A CN 202211267546A CN 115343052 A CN115343052 A CN 115343052A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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Abstract
The invention relates to the field of wind tunnel tests, and particularly discloses a high-precision parallel grid finger distortion generator driving device and a method. The invention solves the problems that the replacement working condition of the conveyor belt type grid finger distortion generator consumes long time, the maintenance frequency of the conveyor belt is high, and the reliability of test data is influenced by the sliding of the conveyor belt.
Description
Technical Field
The invention belongs to the field of wind tunnel tests, and particularly relates to a high-precision parallel grid finger distortion generator driving device and method.
Background
The aircraft engine is one of the most important devices of the aircraft, the reliability of which is crucial to the safety of the aircraft, and the aircraft engine has stability problems under extreme air intake conditions, such as the common problems of surge, flutter, blade coupling, and rotor forced vibration, which affect the aircraft engine and thus the safety of the aircraft. Therefore, the aircraft engine must be subjected to stability assessment during the trial-and-error phase, including but not limited to engine or compressor stability boundary assessment and intake duct to engine compatibility assessment, which is a distortion test. Generally, in the experiment, a distortion generator is used for simulating an outlet pressure distortion result obtained by a wind tunnel test of an aircraft inlet model to an engine inlet to generate required pressure or rotational flow distortion, and an engine anti-distortion test is carried out.
At present, various structural optimization and improvement are made to the distortion generator at home and abroad, and the main purpose is two aspects: the method has the advantages that firstly, the real simulation and adjustment of the steady-state/dynamic pressure distortion ratio are effectively realized, and the distortion map simulation requirement of the aircraft under wide working conditions in the actual flight process is met; secondly, cost reduction and efficiency improvement are achieved, the working efficiency during map replacement is improved, the cost required by map replacement is reduced, high test cost is further reduced, and the test is efficiently completed.
In the industry, the intake pressure distortion simulation devices that have been used in engineering are mainly the following:
1. the distortion net is the simplest and most common distortion net structure and is a traditional distortion simulation generating device, the principle is that devices with different shapes and different blocking ratios are inserted into a main stream, so that the main stream generates pressure loss in local parts, and further the simulation of air inlet pressure is realized, the distortion net structure has the defects that the distortion net structure can only be suitable for one working condition, each distortion map needs to be designed and processed independently, each map component needs to be processed, calibrated and calibrated greatly, a large amount of manpower resources are needed for working condition replacement, and the defects are more;
2. the patent application number CN201610917852 improves the plugboard type, invents an adjustable fan-shaped board fluent distortion simulator, increases the simulation degree of a distortion map, but has insufficient accuracy and adaptability of the simulation map;
3. patent publication No. CN111896263A provides a grid finger distortion generator, the drawback that the shape of the block version of current distortion generator is single is solved, conventional picture peg or simulation board discretization, with independently adjustable grid finger as the stopper, utilize the regulation controlling means to make every grid finger independently adjust the length of stretching into the pipeline, a plurality of grid fingers make up into different operating mode conditions, its drawback is that the overall dimension that adopts synchronous belt drive structure is great, need extra overspeed device tensioner, and because the slip of conveyer belt, cause the grid finger to feed the position precision problem easily, influence experimental data reliability, the conveyer belt life is short in addition, need regular maintenance, and this patent the drive arrangement is the serial type, just can adjust the feeding of next grid finger after accomplishing the feeding of a grid finger, and often there are tens grid fingers to need to adjust to distortion generator, the serial drive arrangement of conveyer belt type in the above-mentioned scheme can cause the test inefficiency, the drawback of cost increase, and because it is longer to change operating mode time, can only pause the test between two operating modes, can not be continuous test, otherwise can produce a large amount of cost to point location precision also is high.
In summary, although the prior art optimizes and avoids the known defects, the prior art still has shortcomings, which affect the efficiency of the distortion test and the reliability of the test data.
Disclosure of Invention
In order to solve the problems that the replacement working condition of the conveyor belt type grating finger distortion generator in the prior art consumes long time, the maintenance frequency of the conveyor belt is high, and the reliability of test data is influenced by the sliding of the conveyor belt, the invention provides a high-precision parallel type grating finger distortion generator driving device and method.
The technical scheme of the invention is as follows: the driving device comprises a motor, wherein the motor is connected with a lead screw through a flexible coupler, the head end and the tail end of the lead screw are fixed through lead screw fixing seats, the lead screw is connected with a grid finger through a lead screw pair, the motor drives the lead screw to rotate, and the lead screw rotates to drive the grid finger to feed linearly.
And limiting rods are arranged on the outer sides of the grid fingers at the two ends of the grid finger distortion generator.
And a pulley block is arranged along the feeding direction of the grid finger, and the outer shape surface of a pulley of the pulley block is matched with that of the grid finger.
The number of the pulley blocks is two, and the pulley blocks are symmetrically arranged on two sides of the grid finger.
The driving device also comprises a lubricating pad, and the outer profile of the lubricating pad is matched with the outer profile of the grid finger.
The lubricating pad is arranged in a groove of a pipeline of the grid finger distortion generator.
Each grid finger in the grid finger distortion generator is connected with one driving device.
The adjacent grid fingers are tightly connected.
The lead screw is a ball screw.
On the other hand, the invention provides a high-precision parallel-connection type grating finger distortion generator driving method, which comprises the following steps:
(1) Connecting a motor with a lead screw through a flexible coupling;
(2) The head end and the tail end of the screw rod are fixed on the table body through screw rod fixing seats, and the screw rod is connected with the grid finger through a screw rod pair;
(3) Calculating the relation between the rotation of the motor and the feeding distance of the grid finger according to the lead of the lead screw;
(4) And starting the motor, wherein the motor operates to drive the lead screw to rotate, so that the rotation of the lead screw drives the grid finger to perform linear feeding.
(5) And adjusting the feed speed of the screw rod to realize the change of the working condition in the grid finger 2 s.
The invention has the beneficial effects that:
the parallel motor is adopted for driving, the motor is utilized to drive the lead screw to rotate, the lead screw rotates to drive the grid fingers to feed linearly, the working condition change of the grid fingers is synchronously realized, the feed speed of the lead screw is adjusted, the working condition change within 2s is realized, and the test efficiency is improved. The invention carries out accurate guide and coarse guide on the motion feed of the grid finger through the pulley block and the lubricating pad, improves the motion precision of the grid finger, further improves the data reliability of a distortion test, and avoids the defects of low precision and easy damage caused by driving of a transmission belt.
On the other hand, the parallel grid finger distortion generator driving device solves the problem that a whole set of driving device needs to be arranged in a narrow space in the grid finger distortion generator in the prior art, has a compact structure, overcomes the technical resistance, optimizes the spatial arrangement, and is convenient to disassemble, assemble and maintain.
Drawings
FIG. 1 is a schematic structural diagram of a motor directly connecting driving grid finger in a high-precision parallel grid finger distortion generator driving device according to the present invention;
FIG. 2 is a schematic view of the assembly of the pulley of the present invention;
FIG. 3 is a schematic view of the relative positions of the lubrication pad and the grid fingers of the present invention;
FIG. 4 is a schematic view of the installation of the lubrication pad of the present invention;
fig. 5 is a schematic diagram of parallel drive gate fingers in the present invention.
Description of the symbols:
1. the flexible coupling comprises a motor, 2 flexible couplings, 3 lead screw fixing seats, 31 fixing ends, 32 supporting ends, 4 lead screw pairs, 5 lead screws, 6 grid fingers, 7 pulley blocks, 71 pulley block supporting rods, 72 bearings, 73 pulleys, 74 pulley block supporting seats, 8 lubricating pads, 9 limiting rods and 10 pipelines.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in the following specific embodiments. It is to be understood that this description is made only by way of example and not as a limitation on the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
With reference to the accompanying drawings 1-5, the driving device comprises a motor 1, wherein the motor 1 is fixed on a motor mounting seat, the motor 1 is connected with a lead screw 5 through a flexible coupling 2, the head end and the tail end of the lead screw 5 are fixed through a lead screw fixing seat 3, one end of the lead screw fixing seat 3 is a fixing end 31, the other end of the lead screw fixing seat is a supporting end 32, the lead screw 5 is connected with a grid finger 6 through a lead screw pair 4, the motor 1 drives the lead screw 5 to rotate, and the rotation of the lead screw 5 drives the grid finger 6 to linearly feed.
And limiting rods 9 are arranged on the outer sides of the grid fingers 6 at the two ends of the grid finger distortion generator. The limiting rod 9 can guide the feeding route of the screw pair 4, and the problem of offset of the screw pair caused by running vibration of a motor is avoided.
The feeding direction of the grid fingers 6 is provided with a pulley block 7, and the outer surface of a pulley 73 of the pulley block 7 is matched with the outer surface of the grid fingers 6 and is jointed with the grid fingers. The number of the pulley blocks 7 is 2, the pulley blocks are symmetrically arranged on two sides of the grid finger 6, and the pulley blocks 7 conduct coarse guiding on a feeding route of the grid finger 6.
The driving device further comprises a lubricating pad 8, and the outer shape surface of the lubricating pad 8 is matched with the outer shape surface of the grid finger 6. The lubricating pad 8 is arranged in a groove of a pipe 10 of the interdigital distortion generator. The material of the lubricating pad 8 is Teflon, the lubricating pad 8 plays a role in accurately guiding the grid fingers 6, the pulley block 7 and the lubricating pad 8 can reduce friction, the sufficient feeding speed of the grid fingers 6 is ensured, and the grid fingers 6 can be prevented from being damaged due to friction.
The lead screw 5 is a ball screw. The grid fingers 6 driven by the adjacent driving devices are tightly connected without gaps, and each grid finger 6 in the grid finger distortion generator is provided with one set of driving device, so that the purpose of synchronously feeding the grid fingers of all the grid finger distortion generators is realized.
The invention provides a high-precision parallel-connection type grating finger distortion generator driving method, which comprises the following steps: connecting a motor 1 with a lead screw 5 through a flexible coupling 2; the head end and the tail end of the lead screw 5 are fixed on the table body through the lead screw fixing seat 3, and the lead screw 5 is connected with the grid finger 6 through the lead screw pair 4; calculating the relation between the rotation of the motor 1 and the feeding distance of the grating fingers 6 according to the lead of the lead screw 5, wherein the relation between the number of the rotation cycles of the motor 1 and the feeding distance of the grating fingers 6 is L = S x r, wherein L is the feeding distance of the grating fingers 6, S is the lead of the lead screw 5, and r is the number of the rotation cycles of the motor; the motor 1 is started, the motor 1 can drive the lead screw 5 to rotate, the rotating motion of the lead screw 5 drives the grid finger 6 to perform linear feeding, the feeding speed of the lead screw 5 is adjusted, and the working condition change of the grid finger 6 within 2s is realized. The driving method is simple to operate, provides a parallel driving mode for the grid fingers 6, and solves the problems that the replacement working condition of the conveyor belt type grid finger distortion generator consumes long time, the maintenance frequency of the conveyor belt is high, and the reliability of test data is influenced by the sliding of the conveyor belt.
Examples
Taking a certain grating finger distortion generator as an example, 60 grating fingers are arranged on the pipe with the inner diameter phi 905mm, and the diameter phi of each grating finger is 15mm.
The specific structure and principle of the present invention are further illustrated with reference to fig. 1-5:
the motor 1 is connected with the lead screw 5 through the flexible coupling 2, and the head end and the tail end of the lead screw 5 are fixed on the table body through the lead screw fixing seat 3, so that the lead screw 5 can be driven to rotate by the operation of the motor 1; the screw 5 is connected with the grid finger 6 through the screw pair 4, so that the rotating motion of the screw 5 drives the grid finger 6 to perform linear feeding. In this embodiment, the motor is a servo motor.
60 grid fingers 6 are arranged side by side, adjacent grid fingers 6 are in close contact without gaps, the width of the motor 1, the width of the flexible coupling 2 and the width of the lead screw pair 4 are all larger than that of the grid fingers 6, the motor driving devices are arranged in four rows, and the shapes of the lead screw pairs 4 with different sizes and specifications are designed according to space sizes.
And calculating the relation between the feeding distances of the motors 1 and the grid fingers 6 according to the lead of the lead screw 5, and controlling 60 motors 1 to realize the feeding distances of the 60 grid fingers so as to realize the change of the working conditions of the grid finger map of the parallel grid finger distortion generator.
Two limiting rods 9 are arranged on the outermost side of the grid finger 6, the limiting rods 9 are made of Teflon, the limiting effect is achieved, friction force can be reduced as much as possible, and the conditions such as vibration caused by abnormal operation of the motor 1 can be prevented.
The pulley blocks 7 are symmetrically arranged in 2 rows in the feeding direction of the grid fingers 6, and the degrees of freedom in other directions except the axial movement of the grid fingers 6 are limited. The pulley block 7 is composed of a pulley block support rod 71, a bearing 72, a pulley 73 and a pulley block support seat 74, wherein the bearing 72 is arranged on the pulley block support rod 71, the pulley 73 is connected with the bearing 72, the pulley block support rod 71 is arranged on the pulley block support seat 74, the outer shape surface of the pulley 73 is completely attached to the outer shape surface of the grid finger 6, and further the grid finger is accurately guided.
The lubricating pad 8 is made of Teflon and is arranged in a groove of the pipeline, the outer shape surface of the lubricating pad 8 is matched with the outer shape surface of the grid finger 6, and the grid finger entering the pipeline is further accurately guided under the condition of a small friction coefficient.
In order to ensure a more accurate feeding map of the grid finger, the invention carries out accurate guide and coarse guide on the feeding route of the grid finger and realizes accurate feeding of the grid finger.
The parallel-connection type grating finger distortion generator driving device is adopted, so that all grating fingers of the grating finger distortion generator can synchronously operate and feed; the rotating speed of the motor is controlled to further realize the adjustment of the feeding speed of the lead screw, so that the rapid change of the test working condition can be realized, and in order to realize the change of the working condition within 2S, the rotating speed of the motor is required to be greater than L/2S, wherein L is the feeding distance of the lead screw, and S is the lead screw lead; a lubricating pad is laid in the pipeline 10, so that friction between the grid fingers and the pipeline 10 is reduced, and the grid fingers are prevented from being worn to cause test precision loss after multiple working condition changes; the pulley block limits the grid fingers outside the pipeline, so that the feeding accuracy of the grid fingers is improved; the structure of the lubricating pad on the pipeline is optimized, the inner molded surface of the lubricating pad is the same as the outer molded surface of the grid finger, the lubricating pad can be completely attached, the size gap is better than 0.1mm, the surface roughness is better than Ra0.8, the lubricating pad can accurately guide the grid finger feeding at the pipeline, the simulation working condition precision of the grid finger generator is further improved, and the problem of low grid finger positioning precision in the grid finger distortion generator is solved.
The specific protection scope of the present invention is not limited to the above explanation, and any simple replacement or modification within the technical spirit of the present invention and technical solution according to the present invention should be within the protection scope of the present invention.
Claims (10)
1. The utility model provides a high accuracy parallel grid finger distortion generator drive arrangement, its characterized in that, drive arrangement includes motor (1), motor (1) is connected with lead screw (5) through flexible coupling (2), and lead screw (5) head and the tail both ends are fixed through lead screw fixing base (3), lead screw (5) are connected with grid finger (6) through lead screw pair (4), and motor (1) drives lead screw (5) rotary motion, and lead screw (5) rotation drive grid finger (6) linear feed.
2. A high-precision parallel grating finger distortion generator driving device according to claim 1, wherein limiting rods (9) are arranged outside the grating fingers (6) at two ends of the grating finger distortion generator.
3. A high precision parallel finger distortion generator driving device according to claim 2 characterized in that a pulley block (7) is arranged along the feeding direction of the finger (6), the external profile of the pulley (73) of the pulley block (7) is matched with the external profile of the finger (6).
4. A high precision parallel type interdigital distortion generator driving device according to claim 3, characterized in that the number of said pulley blocks (7) is two, and said pulley blocks are symmetrically arranged on both sides of said interdigital (6).
5. A high precision parallel type distortion generator driving device according to claim 4, characterized in that the driving device further comprises a lubricating pad (8), the outer shape surface of the lubricating pad (8) is matched with the outer shape surface of the grid finger (6).
6. A high precision parallel distortion generator driving device according to claim 5 wherein the lubrication pad (8) is arranged in a groove of the piping (10) of the distortion generator.
7. A high precision parallel finger distortion generator driving device according to claim 1 wherein each finger (6) in the distortion generator is connected to one of the driving devices.
8. A high precision parallel type interdigital distortion generator driving device according to claim 7, wherein adjacent interdigital electrodes (6) are closely connected.
9. A high precision parallel interdigital distortion generator drive according to claim 8, wherein said screw (5) is a ball screw.
10. A high-precision parallel-type grating finger distortion generator driving method is characterized in that the method is realized based on the high-precision parallel-type grating finger distortion generator driving device of any one of claims 1 to 9, and comprises the following steps:
(1) Connecting a motor with a lead screw through a flexible coupling;
(2) The head end and the tail end of the screw rod are fixed on the table body through screw rod fixing seats, and the screw rod is connected with the grid finger through a screw rod pair;
(3) Calculating the relation between the rotation of the motor and the feeding distance of the grid finger according to the lead of the lead screw;
(4) Starting a motor, wherein the motor operates to drive a lead screw to rotate, so that the rotation of the lead screw drives a grid finger to perform linear feeding;
(5) And adjusting the feed speed of the screw rod to realize the change of the working condition in the grid finger 2 s.
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