Two-point excitation air cannon impact test system

Abstract

A two-point excitation air cannon impact test system, comprising two air cannons (38, 39), a supporting structure, a resonator plate (37), spacer blocks (36) and a test tool (35). The air cannons (38, 39) each comprise an air path integrated system and a synchronous controller; the resonator plate (37) is fixedly connected to the supporting structure; the test tool (35) is fixed on the resonator plate (37) by means of the spacer blocks (36); the two air cannons (38, 39) are respectively located directly below the test tool (35); the two air cannons (38, 39) are respectively pressurized by means of the air path integrated systems; the pressurizing process of the air path integrated systems can ensure that the two air cannons (38, 39) release completely the same pressure; and the synchronous controllers control the air cannons (38, 39) to synchronously drive projectiles in the air cannons to impact the resonator plate (37), so as to form the two-point excitation air cannon impact test system.

Description

A two-point excitation air cannon impact test system Technical Field

[0001] The invention belongs to the field of explosion separation impact test, and in particular relates to a two-point excitation air cannon impact test system. Background Art

[0002] At present, many aerospace vehicles will experience severe explosion separation shock environment during flight. In high-level shock environment, structural damage is very easy to be exposed, which in turn affects the working performance of the aircraft. In order to assess the adaptability of aircraft in high-level shock environment, air cannon test system is generally used to use compressed air instead of high-pressure gas generated by gunpowder explosion to complete the assessment of the system. Due to the increasing size and test level of the whole system, a single air cannon test system can no longer meet the assessment requirements of the whole system, and the single-machine assessment is not enough to replace the whole machine assessment. Therefore, it is necessary to design a set of explosion separation shock test systems that can meet higher levels and larger sizes, which can better meet the explosion separation shock test needs of system-level products.

[0003] Summary of the Invention

[0004] The present invention aims to overcome the deficiencies in the prior art and provide a two-point excitation air cannon impact test system, which provides more realistic and reliable data for the development of the whole machine, can meet the needs of high-level impact testing of large-scale system-level products, and can achieve high synchronization of multi-point impacts to avoid damage to the product caused by secondary impacts.

[0005] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solutions: a two-point excitation air cannon impact test system, comprising two air cannons, a support structure, a resonance plate, a pad and a test fixture, wherein the air cannon includes an air circuit integrated control system and a synchronous controller, the support structure is fixedly connected to the resonance plate, and the test fixture is fixed to the resonance plate through a pad. The two air cannons are respectively directly below the test fixtures, and the two air cannons are pressurized by the air circuit integrated system respectively. The pressurization process of the air circuit integrated system ensures that the release pressure of the two air cannons is exactly the same. The synchronous controller controls the two air cannons to synchronously drive the air cannon projectiles to impact the resonance plate, thereby forming a two-point excitation impact test system.

[0006] The gas circuit integrated control system includes a high-pressure gas cylinder and a pressure reducing valve. The high-pressure gas cylinder is connected in parallel with the high-pressure gas driving gas circuit of the two groups of air cannons through the pressure reducing valve. The high-pressure gas driving gas circuit includes a first pressure sensor, a second pressure sensor, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a first atmospheric chamber, a first small air chamber, a second atmospheric chamber and a second small air chamber. The first pressure sensor is connected to the first solenoid valve and the second solenoid valve and the first atmospheric chamber. The gas circuit formed by the first solenoid valve, the third solenoid valve and the fourth solenoid valve is connected in parallel and is connected to the first small air chamber. The second pressure sensor is connected to the fifth solenoid valve and the sixth solenoid valve and is connected to the second atmospheric chamber. The gas circuit formed by the fifth solenoid valve, the seventh solenoid valve and the eighth solenoid valve is connected in parallel and is connected to the second small air chamber. The atmospheric chamber and the small air chamber are connected to form an integrated gas circuit of the two air cannon impact test systems.

[0007] The synchronous controller includes a PC end, a communication serial port, an FPGA chip, a first relay, a 220V power supply, a power interface, a switching power supply, and a second relay. The PC end transmits a signal to the FPGA chip through the communication serial port. The FPGA chip drives the first relay and the second relay to operate by controlling the switching power supply, and sends a release signal. The FPGA chip ensures that the first relay and the second relay work in a delayed or synchronous manner, and synchronously controls the fourth solenoid valve and the eighth solenoid valve of the gas circuit integrated control system to open at the same time.

[0008] A filter and a high-pressure pressure gauge are provided between the high-pressure gas cylinder and the pressure reducing valve pipeline.

[0009] The first pressure sensor is connected to a first safety valve, a first pressure gauge is connected between the first pressure sensor and the first solenoid valve, a second pressure gauge is connected between the first and second solenoid valves, and a third pressure gauge is connected between the third and fourth solenoid valves.

[0010] The second pressure sensor is connected to a second safety valve, a fourth pressure gauge is connected between the second pressure sensor and the fifth solenoid valve, a fifth pressure gauge is connected between the fifth solenoid valve and the sixth solenoid valve, and a sixth pressure gauge is connected between the seventh solenoid valve and the eighth solenoid valve.

[0011] A second one-way stop valve is provided between the first air chamber and the second air chamber, and a first one-way stop valve is provided between the first small air chamber and the second small air chamber to ensure that the pressures of the air chambers and small air chambers of the two test systems are the same.

[0012] The first relay and the second relay of the synchronous controller can work simultaneously or at intervals, and the interval time adjustment range is 10ms-1000ms.

[0013] The two-point excitation impact test system realizes a multi-point excitation mode through expansion.

[0014] Beneficial effects: The present invention solves the problem that large-scale products cannot undergo high-level impact tests. The air circuit of this test system can avoid erroneous tests when the test is temporarily interrupted at any stage. In order to ensure that the air pressure in the two large air chambers and the two small air chambers is the same, high-pressure one-way stop valves are designed in the two large air chambers (two small air chambers) to ensure the dynamic balance of the high pressure to low pressure of the gas between the air chambers, providing basic conditions for the simultaneous impact of the two devices. The controller can achieve complete control of the actual action time and realize high synchronization of multi-point impacts, avoiding damage to the product caused by secondary impacts. The use of this test system can fully expose the defects of large-scale system-level products in the explosion separation impact environment through ground tests, providing more real and reliable data for the research and development of the whole system. At the same time, the expansion capability of this system is strong, and two-point and multi-point excitation methods can be realized through expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the gas circuit integration system of the dual-gun impact test system;

[0016] FIG2 is a schematic diagram of the principle of the synchronous controller of the present invention;

[0017] FIG3 is a schematic diagram of an implementation of the present invention.

[0018] In the figure: 1. High-pressure gas cylinder, 101. First one-way stop valve, 102. Second one-way stop valve, 2. Filter, 3. High-pressure pressure gauge, 4. Pressure reducing valve, 5. First pressure sensor, 6. Second pressure sensor, 7. First safety valve, 8. Second safety valve, 9. First pressure gauge, 10. First solenoid valve, 11. Second pressure gauge, 12. Second solenoid valve, 13. First air chamber, 14. Third solenoid valve, 15. Third pressure gauge, 16. Fourth solenoid valve, 17. First small air chamber, 18. Fourth pressure gauge, 19. Fifth solenoid valve, 20. Fifth pressure gauge, 21. Sixth solenoid valve, 22. Second large air chamber, 23. Seventh solenoid valve, 24. Sixth pressure gauge, 25. Eighth solenoid valve, 26. Second small air chamber, 27. PC terminal, 28. Communication serial port, 29. FPGA chip, 30. First relay, 31. 220V power supply, 32. Power interface, 33. Switching power supply, 34. Second relay, 35. Test fixture, 36. Spacer, 37. Resonance plate, 38. Air cannon 1, 39. Air cannon 2. DETAILED DESCRIPTION

[0019] The following is a detailed description of the specific implementation method provided according to the present invention in combination with the preferred embodiments: See the accompanying drawings for details. This embodiment provides a two-point excitation air cannon impact test system, including two air cannons, a support structure, a resonance plate, a pad and a test fixture. The air cannon includes an air path integrated control system and a synchronous controller. A resonance plate 37 is fixed to the support structure. The test fixture 35 is fixed on the resonance plate 37 through a pad 36. The two air cannons are respectively located directly below the test fixture. The two air cannons are pressurized through the air path integrated system respectively. The synchronous controller controls the air cannons to synchronously drive the air cannon projectiles to impact the resonance plate, forming a two-point excitation impact test system.

[0020] The preferred solution of this embodiment is that the gas circuit integrated control system includes a high-pressure gas cylinder and a pressure reducing valve, and the high-pressure gas cylinder is connected in parallel with the high-pressure gas driving gas circuit of the two groups of air cannons through the pressure reducing valve, and the high-pressure gas driving gas circuit includes a first pressure sensor, a second pressure sensor, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a first atmospheric chamber, a first small air chamber, a second atmospheric chamber and a second small air chamber, the first pressure sensor and the first solenoid valve and the second solenoid valve are connected to the first atmospheric chamber, the gas circuit formed by the first solenoid valve, the third solenoid valve and the fourth solenoid valve is connected in parallel and is connected to the first small air chamber, the second pressure sensor and the fifth solenoid valve and the sixth solenoid valve are connected to the second atmospheric chamber, the gas circuit formed by the fifth solenoid valve, the seventh solenoid valve and the eighth solenoid valve is connected in parallel and is connected to the second small air chamber, and the atmospheric chamber and the small air chamber are connected to constitute an integrated gas circuit of the two air cannon impact test systems.

[0021] The preferred solution of this embodiment is that the synchronous controller includes a PC terminal 27, a communication serial port 28, an FPGA chip 29, a first relay 30, a 220V power supply 31, a power interface 32, a switching power supply 33 and a second relay 34. The PC terminal 27 transmits a signal to the FPGA chip 29 through the communication serial port 28. The FPGA chip 29 drives the first relay 30 and the second relay 34 to operate by controlling the switching power supply 33, and sends a release signal. The FPGA chip ensures that the first relay and the second relay delay or synchronizes operation, and synchronously controls the fourth solenoid valve and the eighth solenoid valve of the gas path integrated control system to open at the same time.

[0022] A preferred solution of this embodiment is that a filter 2 and a high-pressure pressure gauge 3 are provided between the high-pressure gas cylinder 1 and the pressure reducing valve pipeline.

[0023] The preferred solution of this embodiment is that the first pressure sensor 5 is connected to the first safety valve 7, a first pressure gauge is connected between the first pressure sensor and the first solenoid valve, a second pressure gauge is connected between the first solenoid valve and the second solenoid valve, and a third pressure gauge is connected between the third solenoid valve and the fourth solenoid valve.

[0024] The preferred solution of this embodiment is that the second pressure sensor is connected to the second safety valve, a fourth pressure gauge is connected between the second pressure sensor and the fifth solenoid valve, a fifth pressure gauge 19 is connected between the fifth solenoid valve and the sixth solenoid valve, and a sixth pressure gauge is connected between the seventh solenoid valve and the eighth solenoid valve.

[0025] A preferred solution of this embodiment is that a first one-way stop valve 101 is provided between the second small air chamber to ensure that the pressures in the large air chamber and the small air chamber of the two test systems are the same.

[0026] The preferred solution of this embodiment is that the first relay and the second relay of the synchronous controller work simultaneously or intermittently, and the interval time is adjustable (generally 10ms-1000ms). In this embodiment, the time interval is 20ms.

[0027] A preferred solution of this embodiment is that the two-point excitation impact test system is expanded to realize a multi-point excitation mode to form a multi-point excitation air cannon impact test system.

[0028] The working process and working principle of the present invention are described in detail below in conjunction with the structure of this embodiment:

[0029] As shown in Figures 1, 2 and 3, a two-point excitation air cannon impact test system includes a test fixture 35, a pad 36, a resonant plate 37, an air cannon 1 38, and an air cannon 2 39. The air path integrated system of air cannon 1 and air cannon 2 includes a high-pressure gas cylinder 1, a filter 2, a high-pressure pressure gauge 3, a pressure reducing valve 4, a first pressure sensor 5, a second pressure sensor 6, a first safety valve 7, a second safety valve 8, a first pressure gauge 9, a first solenoid valve 10, a second pressure gauge 11, a second solenoid valve 12, a first air chamber 13, a third solenoid valve 14, a third pressure gauge 15, a fourth solenoid valve 16, a first small air chamber 17, a fourth pressure gauge 18, a fifth solenoid valve 19, a fifth pressure gauge 20, a sixth solenoid valve 21, a second air chamber 22, a seventh solenoid valve 23, a sixth pressure gauge 24, an eighth solenoid valve 25, a second small air chamber 26, a first one-way stop valve 101, and a second one-way stop valve 102. The synchronous controller includes a PC terminal 27 , a communication serial port 28 , an FPGA chip 29 , a first relay 30 , a 220V power supply 31 , a power supply interface 32 , a switching power supply 33 , and a second relay 34 .

[0030] As shown in Figure 1, the high-pressure gas in the high-pressure cylinder is first filtered through a filter, and the outlet pressure of the high-pressure cylinder is monitored using a high-pressure gauge. The pressure is then reduced to a medium pressure range of approximately -2 MPa via a pressure reducing valve. Feedback from the first and second pressure sensors adjusts the air pressure of the two air cannons to the required test pressure. The first and second safety valves prevent excessive inlet pressure from damaging the entire gas circuit system. The first and third inlet solenoid valves are then controlled to open, allowing pressurized gas to enter the first and second small chambers of Air Cannon 1. The fifth and seventh inlet solenoid valves are then controlled to open, allowing pressurized gas to enter the second and second small chambers of Air Cannon 2. These operations can be performed simultaneously in the integrated gas circuit system. High-pressure first and second one-way stop valves are designed in the two large and two small chambers to dynamically balance the high-pressure gas to the low-pressure gas between the chambers, ensuring the same pressure in both chambers and providing the basic conditions for simultaneous impact testing of the two devices. The second and sixth solenoid valves are designed to relieve the pressure in the two air cannons' atmospheric chambers, respectively, should errors occur or the test need to be temporarily interrupted during the aforementioned operation, to prevent erroneous testing or safety incidents. The first and fourth pressure gauges monitor the air cannon inlet pressure to prevent excessive inlet pressure. The second, third, fifth, and sixth pressure gauges monitor the accuracy of the test pressures in the two air cannons' atmospheric and small chambers, respectively. Once the test is ready, the synchronous controller controls the simultaneous opening of the fourth and eighth solenoid valves, releasing the small chambers of both test systems. Following the simultaneous depressurization of the first and second small chambers, the atmospheric chambers also depressurize simultaneously. The high-pressure gas in the atmospheric chambers drives the two projectiles to simultaneously impact the resonant plate, achieving simultaneous excitation of two points.

[0031] As shown in Figure 2, the synchronous controller is powered by a 220V power supply. After the test is ready, the user operates the PC to transmit a release signal to the FPGA chip through the communication serial port. The FPGA chip is a hardware circuit and has a faster execution speed than the single-chip microcomputer. It can achieve true parallel execution. The use of the FPGA chip can make the action time of the two relays fully controllable. The FPGA chip ensures that the first relay and the second relay are delayed or work synchronously to ensure that the fourth solenoid valve and the eighth solenoid valve are opened at the same time, achieving a high degree of synchronization of the two-point impact and avoiding over-testing caused by the secondary impact.

[0032] As shown in Figure 3, the boundary of the resonant plate is fixed by a supporting structure, and the test fixture is fixed to the resonant plate by a pad. The pad can prevent the deformation of the resonant plate from causing incorrect excitation of the test fixture. Air cannon 1 and air cannon 2 are evenly arranged directly below the test fixture to ensure the uniformity of the response magnitude of the entire test fixture. During the test, air cannon 1 and air cannon 2 are pressurized respectively through the air path integration system. The synchronous controller controls the dual air cannon projectiles to hit the resonant plate simultaneously through the delay setting. The target spectrum is obtained through repeated debugging, thereby completing the two-point excitation explosion separation impact test.

[0033] The high-pressure gas cylinder, filter, high-pressure pressure gauge, pressure reducing valve, pressure sensor, safety valve, pressure gauge, and solenoid valve of the present invention were all purchased directly from the market. The large and small gas chambers, one-way stop valve, and the entire gas circuit system, high-pressure connecting pipes, and sensor layout were all processed and assembled. The communication serial port, FPGA chip, first relay, power interface, switching power supply, and second relay of the synchronous controller were all processed and assembled. The PC terminal was purchased directly from the market, and the 220V power supply is basic equipment. The test fixture, spacer, resonance plate, air cannon 1 and air cannon 2 were all processed and assembled. All required raw materials were purchased directly from the market.

[0034] The present invention solves the problem that large-scale products cannot undergo high-level impact tests. The use of this test system can fully expose the defects of large-scale system-level products in explosive separation impact environments through ground tests, providing more real and reliable data for the development of the entire system. The safety of this test system is high enough to cope with all emergencies during high-voltage testing. The controller uses an FPGA chip to make the action time of the two relays fully controllable (synchronous or at a certain interval), which can cope with the problem that the response time of the two solenoid valves may be different, achieve high synchronization of multi-point impacts, and avoid damage to the product caused by secondary impacts. At the same time, the system has a strong expansion capability, and can realize two-point and multi-point excitation methods through expansion. The air path integrated control system integrates the air paths of the two air cannon impact test systems.

[0035] The system's operating process can be briefly described as follows: high-pressure gas is first filtered through a filter and then reduced to a medium pressure range (approximately 2 MPa) by a pressure reducing valve. The pressure is then adjusted to the required test pressure based on feedback from the pressure sensor. The first, third, fifth, and seventh air inlet solenoid valves are then controlled to open, respectively, to enter the atmospheric and small air chambers of the two test systems. The fourth air release solenoid valve is then controlled to release the small air chambers of both test systems simultaneously. Following the decompression of the small chambers, the atmospheric chambers also decompress. The gas in the atmospheric chambers propels two projectiles to simultaneously strike the resonant plate, achieving simultaneous excitation of two points. The first one-way shutoff valve ensures the atmospheric and small chambers of the two test systems are at the same pressure. The second solenoid valve is used to relieve pressure in the atmospheric chambers in case of a temporary interruption in the test, preventing erroneous testing. The first safety valve prevents excessive inlet pressure from damaging the entire system. The second component is the synchronous controller, which primarily includes a communication serial port, a power interface, an FPGA chip, a switching power supply, and the first and second relays. After the test pressurization is completed, the user operates the controller communication serial port on the PC to initiate the release of the electrical signal. The FPGA chip ensures that the first relay works to ensure that the fourth solenoid valve opens at the same time, achieving high synchronization of the two-point impact and avoiding secondary impact.

[0036] Working principle:

[0037] The high-pressure gas in the high-pressure cylinder is first filtered through a filter and then reduced in pressure by a pressure reducing valve. Based on feedback from the first and second pressure sensors, the air pressure in the two air cannons is adjusted to the required test pressure. The inlet solenoid valves are then controlled to allow gas to enter the large and small air chambers of the two air cannons, respectively. The exhaust solenoid valves are then controlled to release the small air chambers of both test systems simultaneously. Following the simultaneous decompression of the small air chambers, the large air chambers are also decompressed. The high-pressure gas in the large air chambers drives the two projectiles to strike the resonant plate simultaneously, achieving dual-point excitation. This system is highly secure and can handle any unexpected issues during high-pressure testing.

[0038] The detailed description of the embodiment described above is illustrative rather than restrictive, and several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the invention should fall within the scope of protection of the invention.

Claims

1. A two-point excitation air cannon impact test system, characterized in that: It includes two air cannons, a support structure, a resonance plate, pads and a test fixture. The air cannon includes a gas circuit integrated control system and a synchronous controller. The resonance plate is fixedly connected to the support structure. The test fixture is fixed on the resonance plate through the pads. The two air cannons are respectively located directly below the test fixture. The two air cannons are respectively pressurized through the gas circuit integrated system. The pressurization process of the gas circuit integrated system ensures that the released pressures of the two air cannons are exactly the same. The synchronous controller controls the two air cannons to synchronously drive the air cannon projectiles to impact the resonance plate, constituting a two-point excitation impact test system.

2. The two-point excitation air cannon impact test system according to claim 1, characterized in that: The gas circuit integrated control system includes a high-pressure gas cylinder and a pressure reducing valve. The high-pressure gas cylinder is connected in parallel with the high-pressure gas drive gas circuits of two groups of air cannons through the pressure reducing valve. The high-pressure gas drive gas circuit includes a first pressure sensor, a second pressure sensor, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a first large air chamber, a first small air chamber, a second large air chamber and a second small air chamber. The first pressure sensor is connected to the first solenoid valve and the second solenoid valve is connected to the first large air chamber. The gas circuit formed by the first solenoid valve and the third solenoid valve and the fourth solenoid valve is connected in parallel and connected to the first small air chamber. The second pressure sensor is connected to the fifth solenoid valve and the sixth solenoid valve is connected to the second large air chamber. The gas circuit formed by the fifth solenoid valve and the seventh solenoid valve and the eighth solenoid valve is connected in parallel and connected to the second small air chamber. The large air chamber and the small air chamber are connected, constituting the integrated gas circuit of the two air cannon impact test systems.

3. The two-point excitation air cannon impact test system according to claim 1, characterized in that: The synchronous controller includes a PC terminal, a communication serial port, an FPGA chip, a first relay, a 220V power supply, a power supply interface, a switching power supply and a second relay. The PC terminal transmits signals to the FPGA chip through the communication serial port. The FPGA chip drives the first relay and the second relay to act by controlling the switching power supply, sending out release signals. By the FPGA chip, it is ensured that the first relay and the second relay work with a time delay or synchronously, synchronously controlling the fourth solenoid valve and the eighth solenoid valve of the gas circuit integrated control system to open simultaneously.

4. The two-point excitation air cannon impact test system according to claim 2, wherein: A filter and a high-pressure pressure gauge are provided between the high-pressure gas cylinder and the pressure reducing valve pipeline.

5. The two-point excitation air cannon impact test system according to claim 2, characterized in that: The first pressure sensor is connected with a first safety valve. A first pressure gauge is connected between the first pressure sensor and the first solenoid valve. A second pressure gauge is connected between the first solenoid valve and the second solenoid valve. A third pressure gauge is connected between the third solenoid valve and the fourth solenoid valve.

6. The two-point excitation air cannon impact test system according to claim 2, characterized in that: The second pressure sensor is connected with a second safety valve. A fourth pressure gauge is connected between the second pressure sensor and the fifth solenoid valve. A fifth pressure gauge is connected between the fifth solenoid valve and the sixth solenoid valve. A sixth pressure gauge is connected between the seventh solenoid valve and the eighth solenoid valve.

7. The two-point excitation air cannon impact test system according to claim 2, characterized in that: A second one-way check valve (102) is provided between the first large air chamber and the second large air chamber. A first one-way check valve (101) is provided between the first small air chamber and the second small air chamber, ensuring that the pressures of the large air chambers and the small air chambers of the two test systems are the same.

8. The two-point excitation air cannon impact test system according to claim 3, characterized in that: The first relay and the second relay of the synchronization controller can work simultaneously or at intervals, and the interval time adjustment range is 10 ms - 1000 ms.

9. The two-point excitation air cannon impact test system according to claim 1, characterized in that: The two-point excitation impact test system according to any one of claims 1-8 realizes a multi-point excitation method through expansion.

Images