Adjustable test operation paddle excitation device and working mode thereof

Abstract

The invention provides an adjustable test operation paddle excitation device and a working mode thereof. The excitation device comprises an excitation mechanism, an excitation mechanism clamp, a guide rail and a paddle rotating shaft clamp, the excitation mechanism comprises a servo motor, a motor reinforcing shell, a spring, a coupler, a spiral slide way, a lining, a cover plate and a hammer head, the servo motor rotates to drive the spiral slide way to rotate, the upper wall face of the spiral slide way extrudes a pin arranged in the hammer head to enable the hammer head to move downwards in a spiral mode, and the spring is compressed when rotating by a certain angle. The pin is no longer extruded by the upper wall surface of the spiral slide way, the spring returns to the original shape to jack the hammer upwards, and the hammer knocks the paddle to give excitation. By adjusting the rotating speed of the servo motor and the relative position of the excitation mechanism on the guide rail, excitation of different periods and different positions can be provided for the test operation paddle, operation modal parameters of the paddle are obtained through data fed back by the sensors distributed on the paddle, and the health state of the paddle is monitored.

Description

Technical Field

[0001] The invention relates to the technical field of ground modal measurement test of helicopter blades, in particular to an adjustable test operation blade excitation device and a working method thereof. Background Art

[0002] The most significant difference between helicopters and other types of aircraft is that helicopters mainly generate traction and implement maneuvers through rotors. They can take off and land vertically, hover in the air, and fly in any direction. They have been widely used in various military and civilian fields.

[0003] Helicopter rotor blades have high structural rigidity and very little deformation during operation. Accurately identifying their operating modal parameters is of great significance for calculating rotor loads, evaluating rotor life, and analyzing helicopter vibration responses. It is a key link in the health monitoring of helicopter components.

[0004] However, the current modal test methods for helicopter blades are basically divided into two categories. One is to use an excitation device to excite the blade when the blade is not running, and use the known excitation input and the output data collected by the sensor arranged on the blade to obtain the modal parameters of the blade, and then use the formula to calculate the modal parameters of the blade at a specified speed; the other is to identify the modal parameters only using the data collected under unknown environmental excitation when the blade is running at a specified speed. Both of the above methods have great limitations: the first method will be inaccurate for some complex nonlinear structure blades; and the second method is limited by the quality of the excitation signal. Poor quality aerodynamic excitation signals will easily cause modal omission problems. Summary of the invention

[0005] In order to solve the problems of the prior art, the present invention provides an adjustable test running blade excitation device and a working method thereof, which can excite the test running blade. The device can be applied to the above-mentioned two types of test methods: for the first type of method, it can provide a measurable excitation signal, so that the modal recognition algorithm based on known output and input signals can be applied to the modal parameter identification of the running blade; for the second type of method, it can provide an excitation signal with good quality to excite the required modal parameters of the blade.

[0006] The present invention provides an adjustable test running blade excitation device, comprising an excitation mechanism, an excitation mechanism fixture, a guide rail and a blade shaft fixture; the blade shaft fixture is fixedly connected to one end of the guide rail by a plurality of fasteners, and the shaft of the test blade is fixed by the blade shaft fixture; the excitation mechanism is fixedly connected to the guide rail by the excitation mechanism fixture, and the guide rail is located below the test blade.

[0007] As a further improvement, the guide rail is provided with locking through holes at equal intervals, and the excitation mechanism is fixedly connected to a locking through hole at a certain position of the guide rail through an excitation mechanism fixture according to the excitation position of the blade.

[0008] Further improvement, the excitation mechanism includes a servo motor, a motor reinforcement housing, a spring, a coupling, a spiral slide, a bushing, a cover plate and a hammer head, wherein a bushing is fixed on the top of the motor reinforcement housing, the servo motor is installed inside the motor reinforcement housing, and the rotating shaft of the servo motor extends out of the top of the motor reinforcement housing and is inserted into the bushing; the spring is installed at the bottom of the bushing; one end of the coupling is fixedly connected to the rotating shaft of the servo motor; and the other end is fixedly connected to the spiral slide; the bottom of the hammer head is fixedly connected to the spring, and a pin is embedded in the hammer head, which is placed inside the spiral slide and slides along the spiral slide; the cover plate is installed on the top of the bushing and fixedly connected to the bushing.

[0009] As a further improvement, locking through holes and tapped holes are drilled on the motor reinforcement housing, and the servo motor is fixedly connected to the motor reinforcement housing by bolts and nuts.

[0010] As a further improvement, a tapped hole is drilled on one side of the excitation mechanism fixture, and the tapped hole of the excitation mechanism fixture is fixedly connected to the motor reinforcement housing by screws; two clamping plates are arranged on the other side of the excitation mechanism fixture, and locking through holes are drilled on the clamping plates, and the locking through holes are fixedly connected to the guide rails by bolts and nuts.

[0011] Further improvement, the blade shaft clamp includes a double clamp, a serrated clamping block and a clamping screw with a cylindrical outer edge; the double clamp includes a first clamp and a second clamp which are fixedly connected by anti-loosening bolts and nuts, the first clamp is welded with two clamping plates with locking through holes, the second clamp is drilled with a square hole and a threaded hole, one end of the serrated clamping block is inserted into the square hole of the second clamp, and the other end thereof is provided with a groove on the upper part, the cylinder in the clamping screw is embedded in the groove of the serrated clamping block, and cooperates with the threaded hole of the second clamp.

[0012] As a further improvement, the side of the serrated clamping block is drilled with a tapped hole and is fixedly connected with an anti-loosening corner block by screws.

[0013] The present invention also provides a working mode of the adjustable test operation blade excitation device, including a relative position adjustment locking mode of the device when the blade is not in operation and a working mode of the excitation mechanism when the blade is in operation, the process of which is as follows: When the blade is not running, the test blade shaft is wrapped by a double clamp, the vertical distance between the hammer head and the blade is adjusted, and the second position of the serrated clamping block and the square hole of the second clamp is adjusted by rotating the clamping screw to clamp the shaft; the anti-loosening angle block is installed to fix the clamping screw; the excitation position of the blade is selected, the relative position of the excitation mechanism fixture on the guide rail is adjusted and locked.

[0014] When the propeller blades are running, the servo motor rotates to drive the spiral slideway to rotate. The upper wall of the spiral slideway squeezes the built-in pin of the hammer head, causing the hammer head to rotate downward and move. The spring is compressed. When it rotates to a certain angle, the pin is no longer squeezed by the upper wall of the spiral slideway, and the spring returns to its original state to push the hammer head upward, and the hammer head strikes the propeller blade to give excitation; after the hammer head is lifted up, the pin continues to enter the spiral slideway to enter the next cycle.

[0015] The beneficial effects of the present invention are: 1. The adjustable test blade excitation device described in the present invention provides a technical solution based on the pain points of the current ground-running blade modal test. It can provide excitations of different periods and positions to the test blades by adjusting the speed of the servo motor and the relative position of the excitation mechanism on the guide rail. The operating modal parameters of the blades are obtained through the data fed back by the sensors distributed on the blades, and the health status of the blades is monitored.

[0016] 2. The adjustable test operation blade excitation device of the present invention includes a guide rail with a locking through hole, so that the excitation mechanism can adjust the relative position with the guide rail. At the same time, the blade shaft clamp adopts a double clamp form. Both designs enhance the versatility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the excitation device of the present invention; Figure 2 A perspective schematic diagram of an excitation mechanism of the excitation device of the present invention; Figure 3 It is a schematic diagram of the assembly of the excitation mechanism and the guide rail of the excitation device of the present invention; Figure 4 A schematic diagram of a blade shaft fixture of the excitation device of the present invention; Figure 5 It is a schematic diagram of the second clamp of the blade shaft clamp of the excitation device of the present invention; Figure 6 It is a schematic diagram of the working state of the excitation device described in the present invention.

[0019] In the figure: 1-motor reinforcement housing; 2-bushing; 3-hammer; 4-excitation mechanism fixture; 5-guide rail; 6-first clamp; 7-second clamp; 8-serrated clamping block; 9-clamping screw; 10-anti-loosening angle block; 11-cover plate; 12-servo motor; 13-spring; 14-coupling; 15-spiral slideway. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "horizontal", "vertical", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and should not be understood as limitations on the present invention; the terms "installation", "connection", "fixed connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a direct connection, it can be an indirect connection through an intermediate medium, or it can be the internal connection of two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1 , 5, 4, 6, the adjustable test running blade excitation device described in the present invention includes an excitation mechanism, an excitation mechanism fixture 4, a guide rail 5 and a blade shaft fixture; the excitation mechanism is fixedly connected to the excitation mechanism fixture 4 by a plurality of fasteners; the excitation mechanism fixture 4 is installed on the guide rail 5, and it can be fixedly connected to the guide rail 5 by a plurality of fasteners; one end of the blade shaft fixture is fixedly connected to the guide rail 5 by a plurality of fasteners.

[0023] like Figure 2As shown, the excitation mechanism includes a servo motor 12, a motor reinforcement housing 1, a spring 13, a coupling 14, a spiral slide 15, a bushing 2, a cover plate 11 and a hammer 3; the motor reinforcement housing 1 is drilled with locking through holes and tapped holes, which can be fixedly connected to the servo motor 12 by bolts and nuts, and at the same time, there is an opening on its upper part to allow the servo motor 12 shaft to extend; the bushing 2 has its symmetry center aligned with the servo motor 12 shaft and is installed on the upper part of the motor reinforcement housing 1, and its base is drilled with tapped holes, which can be fixedly connected to the motor reinforcement housing 1 by screws; the spring 13 is installed at the bottom of the bushing 2; one end of the coupling 14 is fixedly connected to the servo motor 12 shaft; the spiral slide 15 is fixedly connected to the other end of the coupling 14; the bottom of the hammer 3 is fixedly connected to the spring 13, and its embedded pin is placed inside the spiral slide 15; the cover plate 11 is installed on the top of the bushing 2 and fixedly connected to the bushing 2.

[0024] like Figure 1 , 3, 6, the excitation mechanism fixture 4 has a tapped hole drilled on one side, which can be fixedly connected to the motor reinforcement housing 1 by screws. The two clamping plates on the other side are drilled with locking through holes, which can be fixedly connected to the guide rail 5 by bolts and nuts.

[0025] like Figure 1 , 3, 4, and 6, the guide rail 5 is drilled with locking through holes at equal intervals. The root thereof is drilled with another locking through hole, which can be fixedly connected to the blade shaft fixture by anti-loosening bolts and nuts.

[0026] like Figure 1 As shown in Figures 4, 5, and 6, the blade shaft clamp includes a double clamp, a serrated clamping block 8 and a clamping screw 9; the double clamp includes a first clamp 6 and a second clamp 7. The two clamps are fixedly connected by anti-loosening bolts and nuts. The first clamp 6 is welded with two clamping plates, on which locking through holes are drilled. The second clamp 7 is also drilled with a square hole and a threaded hole; one end of the serrated clamping block 8 is inserted into the square hole of the second clamp 7, and a groove is opened on the upper part of the other end, and a tapped hole is drilled on the side and is fixed with the anti-loosening angle block 10 by screws; the cylinder in the clamping screw 9 is embedded in the groove of the serrated clamping block 8 and cooperates with the threaded hole of the second clamp 7.

[0027] The adjustable test operation blade excitation device of the present invention includes a relative position adjustment locking mode of the device when the blade is not in operation and a working mode of the excitation mechanism when the blade is in operation, and the specific implementation process is as follows: When the blade is not running, the test blade shaft is wrapped with double clamps, the vertical distance between the hammer head 3 and the blade is adjusted, and the second position of the serrated clamping block 8 and the square hole of the second clamp 7 is adjusted by rotating the clamping screw 9 to clamp the shaft. Install the anti-loosening angle block 10 to fix the clamping screw 9. Select the excitation position of the blade, and adjust the relative position of the excitation mechanism fixture on the guide rail 5 and lock it.

[0028] When the blade is running, the servo motor 12 rotates to drive the spiral slide 15 to rotate. The upper wall of the spiral slide 15 squeezes the built-in pin of the hammer head 3, causing the hammer head to rotate and move downward. The spring 13 is compressed. When it rotates to a certain angle, the pin is no longer squeezed by the upper wall of the spiral slide 15. The spring 13 returns to its original state and pushes the hammer head 3 upward. The hammer head 3 strikes the blade to stimulate it. After the hammer head 3 is lifted up, the pin continues to enter the spiral slide 15 to enter the next cycle.

[0029] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, the above is only a preferred embodiment of the present invention. Since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field is within the technical scope disclosed by the present invention. For ordinary technicians in the technical field, changes or replacements that can be easily thought of should be covered within the protection scope of the present invention without departing from the principle of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An adjustable test run blade excitation device, characterized in that: It includes an excitation mechanism, an excitation mechanism fixture, a guide rail and a blade shaft fixture; the blade shaft fixture is fixedly connected to one end of the guide rail through a plurality of fasteners, and the shaft of the test blade is fixed by the blade shaft fixture; the excitation mechanism is fixedly connected to the guide rail through the excitation mechanism fixture, and the guide rail is located below the test blade.

2. The adjustable test run blade excitation device according to claim 1, characterized in that: The guide rail is provided with locking through holes at equal intervals, and the excitation mechanism is fixedly connected to a locking through hole at a certain position of the guide rail through an excitation mechanism clamp according to the excitation position of the blade.

3. The adjustable test run blade excitation device according to claim 1, characterized in that: The excitation mechanism includes a servo motor, a motor reinforcement housing, a spring, a coupling, a spiral slide, a bushing, a cover plate and a hammer head, wherein a bushing is fixed on the top of the motor reinforcement housing, the servo motor is installed inside the motor reinforcement housing, and the rotating shaft of the servo motor extends out of the top of the motor reinforcement housing and is inserted into the bushing; the spring is installed at the bottom of the bushing; one end of the coupling is fixedly connected to the rotating shaft of the servo motor; and the other end is fixedly connected to the spiral slide; the bottom of the hammer head is fixedly connected to the spring, and a pin is embedded in the hammer head, which is placed inside the spiral slide and slides along the spiral slide; the cover plate is installed on the top of the bushing and fixedly connected to the bushing.

4. The adjustable test run blade excitation device according to claim 3, characterized in that: The motor reinforcement shell is drilled with locking through holes and tapping holes, and the servo motor is fixedly connected to the motor reinforcement shell by bolts and nuts.

5. The adjustable test run blade excitation device according to claim 4, characterized in that: A tapped hole is drilled on one side of the excitation mechanism fixture, and the tapped hole of the excitation mechanism fixture is fixedly connected to the motor reinforcement shell by screws; two clamping plates are arranged on the other side of the excitation mechanism fixture, and locking through holes are drilled on the clamping plates, and the locking through holes are fixedly connected to the guide rails by bolts and nuts.

6. The adjustable test run blade excitation device according to claim 1, characterized in that: The blade shaft clamp includes a double clamp, a serrated clamping block and a clamping screw with a cylindrical outer edge; the double clamp includes a first clamp and a second clamp that are fixedly connected by anti-loosening bolts and nuts, the first clamp is welded with two clamping plates with locking through holes, the second clamp is drilled with a square hole and a threaded hole, one end of the serrated clamping block is inserted into the square hole of the second clamp, and the other end is provided with a groove on the upper part, the cylinder in the clamping screw is embedded in the groove of the serrated clamping block and cooperates with the threaded hole of the second clamp.

7. The adjustable test run blade excitation device according to claim 6, characterized in that: The side of the serrated clamping block is drilled with a tapping hole and is fixedly connected with an anti-loosening angle block by screws.

8. A working mode of the adjustable test running blade excitation device according to any one of claims 1 to 7, characterized in that: The process includes the relative position adjustment and locking method of the device when the blades are not running and the working method of the excitation mechanism when the blades are running. The process is as follows: When the blade is not running, the test blade shaft is wrapped by the double clamp, the vertical distance between the hammer head and the blade is adjusted, and the second position of the serrated clamping block and the square hole of the second clamp is adjusted by rotating the clamping screw to clamp the shaft; the anti-loosening angle block is installed to fix the clamping screw; the excitation position of the blade is selected, and the relative position of the excitation mechanism fixture on the guide rail is adjusted and locked; When the propeller blades are running, the servo motor rotates to drive the spiral slideway to rotate. The upper wall of the spiral slideway squeezes the built-in pin of the hammer head, causing the hammer head to rotate downward and move. The spring is compressed. When it rotates to a certain angle, the pin is no longer squeezed by the upper wall of the spiral slideway, and the spring returns to its original state to push the hammer head upward, and the hammer head strikes the propeller blade to give excitation; after the hammer head is lifted up, the pin continues to enter the spiral slideway to enter the next cycle.

Images