Propeller testing device and method

Abstract

The present invention and the technical field of equipment testing provide a propeller testing device and method, wherein the propeller testing device includes a support frame, a constant force load loading component and a pulsating load loading component; the constant force load loading component is fixed to the support frame, and is used to apply a constant force to the pulling direction of the propeller blade; the pulsating load loading component is fixed to the support frame, and is used to apply a pulsating force to the upper surface of the blade according to a set frequency, and cooperates with the constant force load loading component to complete the test of the blade. The present invention does not require additional measurement of the force applied to the blade, simplifies the operation of the propeller reliability test, and thus improves the degree of simulation of the propeller reliability test to the actual working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment testing, and in particular to a testing device and method for a propeller. Background Art

[0002] As the concept of near-space matures, international investment in the research and development of long-flight near-space aircraft is increasing. At present, the only feasible propulsion method for long-flight near-space aircraft is propeller propulsion. Due to the characteristics of long-flight near-space aircraft, the requirements for the stable operation time of propellers, that is, reliability requirements, are usually measured in months or years. For the propellers designed and manufactured for high-altitude aircraft, reliability tests are usually required on the ground, and they can only be used after meeting the reliability requirements.

[0003] The force mode of high-altitude propellers when working is usually characterized by a periodic pulsation while the pulling force remains stable at a constant speed. At present, the reliability test device of the propeller usually controls the deformation scale of the blade to achieve reliability testing, but this test method cannot accurately know the magnitude of the applied force, and thus cannot accurately simulate the actual force condition of the above-mentioned propeller. Summary of the invention

[0004] The invention provides a propeller testing device and method, which are used to improve the simulation degree of propeller reliability test on real working conditions.

[0005] An embodiment of the present invention provides a propeller testing device, comprising a support frame, a constant force load loading component and a pulsating load loading component;

[0006] The constant force load loading assembly is fixed to the support frame and is used to apply a constant force to the pulling direction of the propeller blades;

[0007] The pulsating load loading assembly is fixed to the support frame, and is used to apply a pulsating force to the upper surface of the blade according to a set frequency, and cooperates with the constant force load loading assembly to complete the test of the blade.

[0008] In one embodiment, the propeller testing device further comprises a fixture, wherein the fixture is fixed to the extended portion of the blade;

[0009] The clamp is subjected to the constant force applied by the constant-force load loading assembly and the pulsating force applied by the pulsating load loading assembly, and transmits the constant force and the pulsating force to the extended portion of the blade.

[0010] In one embodiment, the constant force load loading assembly includes a connecting member, a torque motor and a plurality of counterweights;

[0011] The connecting piece passes through the bottom of the clamp, one end of which is connected to the torque motor, and the other end is connected to the plurality of counterweights. Driven by the torque motor, the target number of counterweights are pulled up, and the counterweights apply the constant force to the clamp.

[0012] In one embodiment, the rotation angle of the torque motor is determined based on the number and weight of the counterweights; the weight and number of the counterweights are determined based on the pulling force value of the propeller when it is running.

[0013] In one embodiment, the pulsating load loading assembly includes a relay, an electromagnet, a suspension arm, a support member, a first fixing plate and a gravity member;

[0014] One end of the support member is connected to the electromagnet, and the other end is connected to the gravity member through the suspension arm;

[0015] The first fixing plate is fixed to the supporting frame, and the relay controls the electromagnet to absorb or release the first fixing plate according to a set frequency;

[0016] When the electromagnet absorbs the first fixing plate, the gravity member is lifted by the lifting arm;

[0017] When the electromagnet releases the first fixing plate, the gravity member applies the pulsating force to the clamp under the action of gravity.

[0018] In one embodiment, the counterweight is a weight, a plurality of the weights are longitudinally connected in series, and two adjacent weights are connected by a decoupling.

[0019] In one embodiment, the constant force load loading assembly further comprises a pulley, wherein the pulley is fixed below the clamp for the connecting member to pass through.

[0020] In one embodiment, the constant force load loading assembly further includes a second fixing plate, the second fixing plate is fixed to the supporting frame, and the torque motor is disposed above the second fixing plate.

[0021] An embodiment of the present invention provides a propeller testing method, which is applied to the propeller testing device described above, and includes:

[0022] applying a constant force in the pulling direction of the blade according to the constant force load loading assembly;

[0023] Applying a pulsating force to the upper surface of the blade at a set frequency according to the pulsating load loading component;

[0024] The blades were tested based on constant and pulsating forces applied to the blades.

[0025] In one embodiment, before applying a constant force to the pulling direction of the blade according to the constant force load loading assembly, the method includes:

[0026] Establish the correlation information among the rotation angle of the torque motor, the number of counterweights and the weight of the counterweights.

[0027] An embodiment of the present invention provides a propeller testing device and method, wherein the propeller testing device includes a support frame, a constant force load loading assembly, and a pulsating load loading assembly; the constant force load loading assembly is fixed to the support frame, and is used to apply a constant force to the pulling direction of the propeller blade; the pulsating load loading assembly is fixed to the support frame, and is used to apply a pulsating force to the upper surface of the blade according to a set frequency, and cooperates with the constant force load loading assembly to complete the test of the blade. The present invention does not require additional measurement of the force applied to the blade, simplifies the operation of the propeller reliability test, and thus improves the degree of simulation of the propeller reliability test to the actual working condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0029] Figure 1 This is one of the structural schematic diagrams of the propeller testing device provided by the embodiment of the present invention;

[0030] Figure 2 This is a second structural schematic diagram of a propeller testing device provided in an embodiment of the present invention;

[0031] Figure 3 is a schematic flow chart of a propeller testing method provided by an embodiment of the present invention;

[0032] Reference numerals:

[0033] 10-support frame; 11-constant force load loading assembly; 12-pulsating load loading assembly; 13-blade; 14-clamp; 15-strain monitoring system;

[0034] 110-connecting member; 111-torque motor; 112-counterweight; 113-second fixing plate; 114-pulley;

[0035] 120 - electromagnet; 121 - boom; 122 - support member; 123 - first fixing plate; 124 - gravity member. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0037] refer to Figure 1 to Figure 2 As shown, an embodiment of the present invention provides a propeller testing device, comprising a support frame 10, a constant force load loading assembly 11 and a pulsating load loading assembly 12;

[0038] The constant force load applying assembly 11 is fixed to the support frame 10 and is used to apply a constant force to the pulling direction of the propeller blades 13;

[0039] The pulsating load loading assembly 12 is fixed to the support frame 10 , and is used to apply a pulsating force to the upper surface of the blade 13 according to a set frequency, and cooperates with the constant force load loading assembly 11 to complete the test of the blade 13 .

[0040] It should be noted that the embodiment of the present invention performs reliability testing on the blade 13 by simulating constant force and pulsating force.

[0041] The support frame 10 is used to fix the propeller blades 13 and other components. The material of the support frame 10 can be metal, such as steel, aluminum alloy, etc., and its shape can be a rectangular parallelepiped or a cube, or can be determined based on test requirements.

[0042] The constant load loading assembly 11 is fixed inside the support frame 10 by bolts, and the pulsating load loading assembly 12 is fixed above the support frame 10 by bolts.

[0043] The propeller includes multiple blades 13. The constant force load loading component 11 and the pulsating load loading component 12 can apply force to the blades 13 at the same time or at different times. The blades 13 will shake or swing after being subjected to the force applied by the constant force load loading component 11 and the pulsating load loading component 12.

[0044] It can be understood that constant force refers to a force whose magnitude and direction do not change over a period of time; pulsating force refers to a force (load) applied to an object that changes periodically, such as a human pulse; the pulling direction of the blade 13 refers to the driving force direction of piston aircraft and turboprop aircraft.

[0045] The reliability test process of the propeller is as follows: the constant force loading component 11 applies a constant force to the pulling direction of the blade 13, and the pulsating load loading component 12 applies a pulsating force to the upper surface of the blade 13 according to a set frequency (such as 30 seconds or 1 minute), and then the strain monitoring system 15 monitors the changes of the blade 13 under the action of the two forces, and then judges the reliability of the blade 13 based on the changes, wherein the strain monitoring system 15 is used to monitor the strain of the corresponding parts of the blade 13. For example, within the set time, if the strain value of the blade 13 under the action of the two forces does not change significantly, it is judged that the reliability of the blade 13 meets the standard.

[0046] The propeller test device provided in the embodiment of the present invention applies a constant force to the pulling direction of the blade 13 through the constant force load loading component 11, and applies a pulsating force to the upper surface of the blade 13 through the pulsating load loading component 12, and then tests the reliability of the blade 13 based on the constant force and the pulsating force applied to the blade 13. The present invention does not need to measure the force applied to the blade 13 additionally, simplifies the operation of the propeller reliability test, and thus improves the simulation degree of the propeller reliability test to the real working condition.

[0047] Based on the above embodiment, the propeller testing device also includes a fixture 14, which is fixed to the extended part of the blade 13; the fixture 14 is subjected to the constant force applied by the constant force load loading assembly 11 and the pulsating force applied by the pulsating load loading assembly 12, and transmits the constant force and the pulsating force to the extended part of the blade 13.

[0048] It should be noted that the distance from the blade root to the blade tip is called the span of the blade 13 , and the clamp 14 is fixed to the span portion of the blade 13 to exert force on the blade 13 corresponding to the span.

[0049] When the constant-force load loading component 11 and the pulsating load loading component 12 apply force to the blade 13, the force is applied to the clamp 14, that is, the clamp 14 is subjected to the constant force applied by the constant-force load loading component 11 and the pulsating force applied by the pulsating load loading component 12, and then the constant force and the pulsating force are transmitted to the extension part of the blade 13, thereby achieving the application of force on the blade 13 corresponding to the extension.

[0050] In the embodiment of the present invention, the clamp 14 applies force to the blade 13 corresponding to the extension, thereby improving the degree of simulation of the propeller reliability test to the actual working condition.

[0051] Based on the above embodiment, the constant force load loading assembly 11 includes a connecting member 110, a torque motor 111 and a plurality of counterweights 112; the connecting member 110 passes through the bottom of the clamp 14, one end is connected to the torque motor 111, and the other end is connected to the plurality of counterweights 112. Driven by the torque motor 111, a target number of counterweights 112 are pulled up, and the counterweights 112 apply the constant force to the clamp 14.

[0052] It should be noted that the torque motor 111 is used to adjust the lifting height of the counterweight 112. The torque motor 111 includes a motor turntable, and the connecting member 110 is wound on the motor turntable, wherein the connecting member 110 can be a steel cable, an iron cable, a chain, etc.

[0053] The connecting member 110 passes through the bottom of the clamp 14, one end of which is connected to the torque motor 111, and the other end of which is connected to a plurality of counterweights 112. For example, a hook is provided at the end of the connecting member 110, and a plurality of counterweights 112 are pulled up by the hook. Driven by the torque motor 111, the motor plate rotates a set angle, and the connecting member 110 pulls up a target number of counterweights 112 as the motor plate rotates, so as to apply a constant force to the clamp 14 through the counterweights 112, wherein the number of counterweights 112 is determined based on the constant force applied to the clamp 14.

[0054] Furthermore, the rotation angle of the torque motor 111 is determined based on the number and weight of the counterweight 112. For example, the relationship between the rotation angle of the torque motor 111, the number of counterweights 112, and the weight of the configuration components is pre-established, wherein different configuration components correspond to different weights. Based on this, after determining the relationship between the three, the optional angle of the torque motor 111 can be adjusted by the number and weight of the counterweight 112.

[0055] Furthermore, the counterweight 112 is a weight, and a plurality of weights are connected in series longitudinally, and two adjacent weights are connected by a hook. The weight is a standard measuring tool for mass value transmission, and each weight is provided with a hook inside for connecting the weights.

[0056] Furthermore, the constant force load loading assembly 11 also includes a pulley 114, which is fixed below the fixture 14 for the connector 110 to pass through. The pulley 114 is a circular wheel that can rotate around the central axis, and has a groove on the circumferential surface of the circular wheel. The connector 110 is wound around the groove, and any end of the connector 110 is pulled with force, so that the friction between the connector 110 and the circular wheel will cause the circular wheel to rotate around the central axis. Driven by the torque motor 111, the connector 110 moves longitudinally and generates friction between the circular wheel, so that the circular wheel rotates around the central axis based on the friction, thereby applying a constant force to the fixture 14.

[0057] Furthermore, the constant force load loading assembly 11 further includes a second fixing plate 113, the second fixing plate 113 is fixed to the support frame 10, and the torque motor 111 is arranged above the second fixing plate 113. The second fixing plate 113 can be an iron plate or a steel plate, etc. The second fixing plate 113 is fixed to the inside of the support frame 10 by bolts, and the torque motor 111 is fixed above the second fixing plate 113 by bolts.

[0058] The embodiment of the present invention does not need to additionally measure the force applied to the blade 13, which simplifies the operation of the propeller reliability test, thereby improving the degree of simulation of the propeller reliability test to the actual working condition.

[0059] Based on the above embodiment, the pulsating load loading assembly 12 includes a relay, an electromagnet 120, a suspension arm 121, a support member 122, a first fixing plate 123 and a gravity member 124;

[0060] One end of the support member 122 is connected to the electromagnet 120, and the other end is connected to the gravity member 124 through the suspension arm 121;

[0061] The first fixing plate 123 is fixed to the supporting frame 10, and the relay controls the electromagnet 120 to absorb or release the first fixing plate 123 according to a set frequency;

[0062] When the electromagnet 120 absorbs the first fixing plate 123 , the gravity member 124 is lifted up by the lifting arm 121 ;

[0063] When the electromagnet 120 releases the first fixing plate 123 , the gravity member 124 applies the pulsating force to the clamp 14 under the action of gravity.

[0064] It should be noted that the electromagnet 120 is controlled by a relay to apply a pulsating load to the blade 13 at a set frequency.

[0065] One end of the support member 122 is connected to the electromagnet 120 , and the other end is connected to the gravity member 124 through the suspension arm 121 .

[0066] The first fixing plate 123 is fixed on the supporting frame 10 by bolts, and the first fixing plate 123 can be an iron plate.

[0067] The relay controls the electromagnet 120 to absorb or release the first fixed plate 123 according to the set frequency. When the electromagnet 120 absorbs the first fixed plate 123, the weight member 124 is lifted by the suspension arm 121; when the electromagnet 120 releases the first fixed plate 123, the weight member 124 applies a pulsating force to the clamp 14 under the action of gravity, wherein the weight member 124 can be a weight. For example, when the power is on, the electromagnet 120 is attracted to the first fixed plate 123, and the weight is pulled up by the suspension arm 121; when the power is off, the electromagnet 120 has no suction force with the first fixed plate 123, and the weight falls by gravity to impact the clamp 14, so that the blade 13 is subjected to a pulsating load.

[0068] The embodiment of the present invention does not need to additionally measure the force applied to the blade 13, which simplifies the operation of the propeller reliability test, thereby improving the degree of simulation of the propeller reliability test to the actual working condition.

[0069] Based on the above embodiments, reference Figure 3 The embodiment of the present invention provides a propeller testing method, which is applied to the propeller testing device of the above embodiment, including:

[0070] Step 100, applying a constant force to the pulling direction of the blade according to the constant force load loading assembly;

[0071] Step 200, applying a pulsating force to the upper surface of the blade at a set frequency according to the pulsating load loading component;

[0072] Step 300 , testing the blade according to the constant force and the pulsating force applied to the blade.

[0073] It should be noted that the embodiment of the present invention performs reliability testing on the blade 13 by simulating constant force and pulsating force.

[0074] The constant force loading component 11 and the pulsating load loading component 12 can apply force to the blade 13 at the same time or at different times. The blade 13 will shake or swing after being subjected to the force applied by the constant force loading component 11 and the pulsating load loading component 12. It can be understood that constant force refers to a force whose magnitude and direction do not change over a period of time; pulsating force refers to a force (load) applied to an object that changes, such as a human pulse.

[0075] The reliability test process of the propeller is as follows: the constant force loading component 11 applies a constant force to the pulling direction of the blade 13, and the pulsating load loading component 12 applies a pulsating force to the upper surface of the blade 13 according to a set frequency (such as 30 seconds or 1 minute), and then the strain monitoring system 15 monitors the changes of the blade 13 under the action of the two forces, and then judges the reliability of the blade 13 based on the changes. For example, within the set time, if the strain value of the blade 13 under the action of the two forces does not change significantly, it is judged that the reliability of the blade 13 meets the standard.

[0076] The rotation angle of the torque motor 111 is determined based on the number and weight of the counterweight 112. For example, a correlation between the rotation angle of the torque motor 111, the number of the counterweight 112, and the weight of the configuration is established in advance, where different configurations correspond to different weights. Based on this, after determining the correlation between the three, the optional angle of the torque motor 111 can be adjusted by the number and weight of the counterweight 112.

[0077] In one embodiment, the reliability test process of the propeller is as follows:

[0078] (1) According to the propeller blade 13 tension corresponding to the flight condition, the weights of different weights to be used in the test are connected in series.

[0079] (2) The clamp 14 is fixed to the corresponding span of the blade 13 , and the pulley 114 is installed on the clamp 14 .

[0080] (3) The motor turntable and the weight are connected by a steel cable and passed around the pulley 114.

[0081] (4) Calibrate the weight lifting height corresponding to the motor rotation angle. After calibration, the number of lifting weights can be controlled by different motor rotation angles.

[0082] (5) The torque motor 111 is turned to control the magnitude of the applied constant force. The principle is as follows: at the beginning, the bottom weight touches the ground, and all weights are superimposed on it. At this time, the blade 13 is not subjected to force. When the torque motor 111 rotates to a certain angle, the top weight is suspended in the air, and the blade 13 is subjected to a constant force load. The angle of the torque motor 111 is continuously changed, and more weights are suspended in the air, so the blade 13 is subjected to a greater constant force load. The constant force load applied can be controlled by the rotation angle of the motor according to the number and weight of the added weights.

[0083] (6) The electromagnet 120 is controlled by a relay to apply a pulsating load to the blade 13 at a fixed frequency. The principle is as follows: when the power is on, the electromagnet 120 is attracted and the heavy hammer is pulled up through the arm 121; when the power is off, the electromagnet 120 has no suction force, and the heavy hammer falls by gravity to impact the fixture 14, so that the blade 13 is subjected to a pulsating load.

[0084] (7) Strain gauges are arranged at different locations on the surface of the blade 13, and the strain changes of different loading weights are monitored by the strain monitoring system 15. If there is no obvious change in the strain value under the corresponding weight during the entire loading cycle, the reliability of the blade 13 is considered to meet the standard. For example, maintain a small constant load for 12 hours and record the strain value; maintain a large constant load for 12 hours and record the strain value. After that, continue to load with a small load for 12 hours and a large load for 12 hours every day, and compare the strain values ​​under the two working conditions every day. In addition, the loading duration can also be controlled according to the specific working conditions.

[0085] The propeller testing method provided by the embodiment of the present invention applies a constant force to the pulling direction of the propeller blade 13 according to the constant force load loading component 11, and applies a pulsating force to the upper surface of the blade 13 at a set frequency according to the pulsating load loading component 12, and finally tests the blade 13 according to the constant force and the pulsating force applied to the blade 13. The present invention does not need to measure the force applied to the blade 13 additionally, simplifies the operation of the propeller reliability test, and thus improves the simulation degree of the propeller reliability test to the real working condition.

[0086] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0087] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A propeller testing device, characterized in that: It includes a support frame, a constant load loading component and a pulsating load loading component; The constant force load loading assembly is fixed to the support frame and is used to apply a constant force to the pulling direction of the propeller blades; The pulsating load loading assembly is fixed to the support frame, and is used to apply pulsating force to the upper surface of the blade according to a set frequency, and cooperate with the constant force load loading assembly to complete the test of the blade; The propeller testing device further comprises a fixture, wherein the fixture is fixed to the extended portion of the blade; The fixture is subjected to the constant force applied by the constant force loading assembly and the pulsating force applied by the pulsating load loading assembly, and transmits the constant force and the pulsating force to the extension part of the blade; The constant force load loading assembly includes a connecting piece, a torque motor and a plurality of counterweights; The connecting member passes through the bottom of the clamp, one end of which is connected to the torque motor, and the other end of which is connected to the plurality of counterweights. Under the drive of the torque motor, a target number of counterweights are pulled up, and the counterweights apply the constant force to the clamp; The pulsating load loading assembly includes a relay, an electromagnet, a suspension arm, a support member, a first fixing plate and a gravity member; One end of the support member is connected to the electromagnet, and the other end is connected to the gravity member through the suspension arm; The first fixing plate is fixed to the supporting frame, and the relay controls the electromagnet to absorb or release the first fixing plate according to a set frequency; When the electromagnet absorbs the first fixing plate, the gravity member is lifted by the lifting arm; When the electromagnet releases the first fixing plate, the gravity member applies the pulsating force to the clamp under the action of gravity.

2. The propeller testing device according to claim 1, characterized in that: The rotation angle of the torque motor is determined based on the number and weight of the counterweights; the weight and number of the counterweights are determined based on the pulling force value of the propeller when it is running.

3. The propeller testing device according to claim 1, characterized in that: The counterweight is a weight, and a plurality of the weights are connected in series longitudinally, and two adjacent weights are connected by a decoupling.

4. The propeller testing device according to claim 1, characterized in that: The constant force load loading assembly also includes a pulley, which is fixed below the clamp and allows the connecting member to pass through.

5. The propeller testing device according to claim 1, characterized in that: The constant force load loading assembly also includes a second fixing plate, the second fixing plate is fixed to the supporting frame, and the torque motor is arranged above the second fixing plate.

6. A propeller testing method, characterized in that: The propeller testing device used in any one of claims 1 to 5 comprises: applying a constant force in the pulling direction of the blade according to the constant force load loading assembly; Applying a pulsating force to the upper surface of the blade at a set frequency according to the pulsating load loading component; The blades were tested based on constant and pulsating forces applied to the blades.

7. The propeller testing method according to claim 6, characterized in that: Before applying a constant force to the pulling direction of the blade according to the constant force load loading assembly, the method includes: Establish the correlation information among the rotation angle of the torque motor, the number of counterweights and the weight of the counterweights.

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