Amplifying device for high acceleration vibration test of explosive devices

Abstract

The utility model discloses an amplifying device for high-acceleration vibration testing of pyrotechnics, which is used in testing occasions where the existing vibration table cannot meet the high-acceleration vibration requirements of pyrotechnics. The high-acceleration vibration testing amplifying device for pyrotechnics provided by the utility model comprises a resonance plate, a base plate, and fixing screws; the resonance plate and the base plate are connected and fixed in a certain way, the pyrotechnic under test is installed in a specific position of the amplifying device, and a monitoring sensor is fixed nearby to feedback the test value. During the test, the test device is fixed on the table of the vibration table through the fixing screw hole, and an acceleration sensor is installed on the base plate to control the movement of the vibration table. Relying on the vibration table to output a small excitation, the pyrotechnic under test is subjected to a high-acceleration vibration test through the amplifying device, thereby solving the problem that the existing vibration table cannot meet the large-value vibration test requirements of pyrotechnics.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration testing, and in particular relates to an amplifying device for high-acceleration vibration testing of explosive devices. Background Art

[0002] Vibration testing is closely linked to science and technology like other engineering projects. With the development of science and technology, vibration testing technology has become more comprehensive, complete and improved. In actual applications, vibration may cause structural damage, work performance failure and process performance damage to products. In order to improve product reliability and prevent the above-mentioned failures and damages during product use, the vibration test problem must be well solved in engineering. For this reason, vibration testing accompanies the entire production process of the product almost from the beginning of components.

[0003] Usually, a series of controllable vibration simulations are performed in the laboratory to test whether the product can withstand the vibration environment during transportation or use during its effective life cycle, and to determine the requirements for product design and function. Vibration tables that provide vibration simulation can be divided into three categories according to their working principles, namely electric, electro-hydraulic and mechanical. Electric vibration tables are now widely used in laboratories due to their advantages such as large working frequency range, small waveform distortion and convenient control. The electric vibration table is driven by the interaction between a constant magnetic field and a coil located in the magnetic field and passing a certain alternating current to generate electric force. The electric vibration table is mainly composed of three parts: a stationary part, a movable part and an air gap. The stationary part includes a magnetic cylinder, an excitation coil and a support; the movable part includes a moving coil, a moving coil frame and a suspension spring; the air gap refers to the gap between the pole core and the pole plate of the magnetic cylinder. When a direct current is passed through the excitation coil, a constant magnetic field is generated in the magnetic cylinder and the air gap. When alternating current is passed through the moving coil, according to the law of electromagnetic induction, the moving coil is acted upon by an alternating force. This alternating force forces the moving coil and the moving coil frame to vibrate back and forth, driving the vibration table and the pyrotechnics on the table to move up and down.

[0004] Vibration conditions include frequency range, test value, test time and test direction. Vibration tables of different specifications have different output forces, loads and frequency ranges, that is, the maximum test values ​​that can be produced are different.

[0005] Fatigue damage caused by resonance is one of the main mechanisms that cause failure of key components of high-end power equipment such as aircraft engines and gas turbines, and such resonance usually has a large vibration acceleration. The existing 100kN excitation force vibration table obviously cannot meet the autonomous flight vibration requirement of 197.6g of root mean square acceleration. In fact, the mass of the dynamic coil of other types of vibration tables increases with the increase of the excitation force. In addition, considering the vibration resistance of the dynamic coil, the maximum acceleration of the general vibration table is limited to no more than 100g. Utility Model Content

[0006] The utility model provides an amplifying device for high-acceleration vibration test of pyrotechnics, and aims to solve the problem that the existing vibration table cannot meet the test requirements.

[0007] In order to solve the above technical problems, the utility model provides an amplifying device for high-acceleration vibration testing of explosive devices, characterized in that it includes a resonance plate (1), a substrate (3), a control sensor (4), and a monitoring sensor (6); the resonance plate and the substrate are connected and fixed in a cross shape; the control sensor is installed on the substrate; and the monitoring sensor (6) is installed at the end position of the resonance plate (1).

[0008] Beneficial effects:

[0009] 1. The pyrotechnics under test can be installed at different positions of the resonance plate according to the test value. A fixed sensor is installed at the installation interface between the pyrotechnics under test and the resonance plate to monitor the test value. By adjusting the output of the vibration table, the test value of the pyrotechnics under test can be accurately controlled. The test process is simple and efficient.

[0010] 2. The vibration amplifying device involved in the utility model has strong versatility. It only needs to arrange fixing holes at corresponding positions of the amplifying device substrate corresponding to the size of the vibration table installation holes, which is easy to modify and promote.

[0011] 3. The vibration amplification device involved in the utility model can effectively meet the high acceleration vibration test of pyrotechnics of different specifications and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a high acceleration vibration test amplification device for pyrotechnics.

[0013] Numbers in the figure:

[0014] 1-resonance plate; 2-resonance plate and base plate fixing screws; 3-base plate; 4-control sensor; 5-device and vibration table fixing screw holes; 6-monitoring sensor; 7-tested pyrotechnics. DETAILED DESCRIPTION

[0015] In order to make the purpose, content and advantages of the utility model clearer, the specific implementation methods of the utility model are further described in detail below.

[0016] The utility model proposes an amplifying device for high acceleration vibration test of explosive devices, comprising a resonance plate 1, a base plate 3, a control sensor 4 and a monitoring sensor 6;

[0017] The base plate 3 is reliably connected to the vibration table surface through a plurality of fixing screws. The base plate is bonded with a control sensor 4 and connected to a test circuit. The base plate is usually arranged at a stress concentration position and serves as a control channel to collect vibration signals. The movement of the vibration table is controlled by the feedback of the control sensor to ensure that the base plate reaches the required vibration value. The base plate (3) is used to fix the resonance plate (1) whose installation position of the tested pyrotechnic is adjustable.

[0018] The resonance plate 1 is cross-fixed with the base plate, and the contact surface is fastened by screws. The other positions are suspended without any constraints. The monitoring sensor is bonded to the end of the resonance plate as a monitoring channel to collect vibration signals. The signal is the specified value required by the test. The pyrotechnics are fixed to the end of the resonance plate near the monitoring sensor by threaded connection. The processing materials of the base plate and the resonance plate are both LY12 aluminum.

[0019] The pyrotechnics under test are installed at a specific position on the resonance plate of the amplifier device, and a monitoring sensor is fixed nearby to feedback the test value. During the test, the test device is fixed on the vibration table through the fixing screw holes, and the acceleration sensor is installed on the base plate to control the movement of the vibration table. The vibration table provides a vibration excitation signal with the same test frequency, and the amplifier base plate is fixed on the vibration table through the fixing screw holes.

[0020] The pyrotechnic product under test can be installed at different positions of the resonance plate (1) according to the test value, and the test value to which the pyrotechnic product under test is subjected is related to the distance of the base plate fixing screws (2).

[0021] The resonant plate (1) is in a resonant working state and is used to amplify the mechanical vibration signal generated by the vibration table to achieve high acceleration vibration.

[0022] At the beginning of the test, a low-level vibration is applied and controlled using the feedback signal of the control sensor. Then, during the test, the vibration input is adjusted based on experience, the response of the monitoring sensor is measured and compared with the given conditions until the vibration level of the monitoring sensor reaches the specified vibration level.

[0023] Test verification: The autonomous flight vibration test conditions of a certain detonator are shown in Table 1:

[0024] Table 1 Autonomous flight vibration test conditions for a certain detonator

[0025]

[0026] The above-mentioned vibration amplification device was used for the test. After the test was carried out for 1 minute, data was collected every 30 seconds, and a total of 9 points were collected. The decibel formula dB acceleration = 20lg (G1 / G2) was used to calculate the deviation between the signal collected by the monitoring sensor (G1) and the actual required value (G2 = 139.9g / 113g). The data are shown in Tables 2 and 3.

[0027] The vibration energy level in the X direction is 3.6%, that is, when the vibration table control sensor signal reaches 139.9g×3.6%=5.0364g, the acceleration value required for the test can be generated at the end position of the resonant plate.

[0028] The vibration energy level in the Y direction is 4.0%, that is, when the vibration table control sensor signal reaches 113g×4.0%=4.52g, the acceleration value required for the test can be generated at the end position of the resonant plate.

[0029] Table 2 Autonomous flight vibration test data of a detonator in X direction

[0030] Control sensor(g) 5.003 5.029 5.07 5.024 5.047 5.058 5.028 5.02 5.039 Monitoring sensor(g) 146.9 137.8 131.7 128.9 133.5 140.5 128.4 131.9 144.1 Deviation(dB) 0.424 -0.131 -0.525 -0.711 -0.407 0.037 -0.745 -0.511 0.257

[0031] Table 3. Test data of Y-direction vibration of a detonator in autonomous flight

[0032] Control sensor(g) 4.529 4.544 4.526 4.534 4.528 4.54 4.52 4.505 4.528 Monitoring sensor(g) 114.8 118.9 108.6 111.4 107.4 108.6 111.4 99.38 101.6 Deviation(dB) 0.137 0.442 -0.345 -0.124 -0.441 -0.345 -0.124 -1.116 -0.924

[0033] It can be seen from the above data that the deviation range between the monitoring sensor value and the actual required value is between -1.116dB and 0.442dB. "GJB 150.16A-2009 Military Equipment Laboratory Environmental Test Method Part 16: Vibration Test" does not clearly specify the tolerance range of random vibration root mean square acceleration. In "6.2.3.2 Acceleration Spectral Density", Article a) stipulates that "In any case, the tolerance of the acceleration spectrum density within the entire test frequency range should not exceed ±3dB;" Article c) "Root mean square acceleration value" stipulates that "The root mean square value is very useful in monitoring vibration tests. ... The tolerance of the root mean square monitoring value is determined based on the test variables and test equipment." Referring to the product test outline that stipulates that the tolerance range of random vibration root mean square acceleration is ±1.5dB, it can be seen that the test data obtained by the amplification device meets the test requirements, solving the problem that the existing vibration table could not meet the test needs.

[0034] The utility model has strong versatility, and only needs to arrange fixing holes at corresponding positions of the substrate of the amplifying device according to the size of the installation holes of the vibration table, and is easy to modify and promote.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An amplifying device for high acceleration vibration test of explosive devices, characterized in that: It comprises a resonance plate (1), a substrate (3), a control sensor (4), and a monitoring sensor (6); the resonance plate and the substrate are connected and fixed in a cross shape; the control sensor is installed on the substrate; and the monitoring sensor (6) is installed at the end of the resonance plate (1).

2. The amplifying device for high acceleration vibration test of explosive devices according to claim 1, characterized in that: The control sensor is an acceleration sensor.

3. The amplifying device for high acceleration vibration test of explosive devices according to claim 1, characterized in that: The control sensor is set at the location where the stress is concentrated.

4. The amplifying device for high acceleration vibration test of explosive devices according to claim 1, characterized in that: The explosive device is fixed at the end of the resonance plate near the monitoring sensor.

5. The amplifying device for high acceleration vibration test of explosive devices according to claim 1, characterized in that: The processing materials of the substrate and the resonance plate are both LY12 aluminum.

6. The amplifying device for high acceleration vibration test of explosive devices according to claim 1, characterized in that: The base plate is fixed on the vibration table.

7. The amplifying device for high acceleration vibration test of explosive devices according to claim 1, characterized in that: The pyrotechnic device under test is installed at different positions on the resonance plate (1) according to the test value.

8. The amplifying device for high acceleration vibration test of explosive devices according to claim 1, characterized in that: The contact surface between the resonant plate and the base plate is fastened by screws.

9. The amplifying device for high acceleration vibration test of explosive devices according to claim 6, characterized in that: The vibration table provides a vibration excitation signal with the same frequency as the test frequency.

10. The amplifying device for high acceleration vibration test of explosive devices according to claim 6, characterized in that: The motion of the shaker is controlled by feedback from the control sensor.

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