Large-load wide-frequency-domain impact experiment device and method

Abstract

The invention provides a large-load wide-frequency-domain impact experiment device and method.The large-load wide-frequency-domain impact experiment device comprises at least one electromagnetic loading gun, a resonance plate and an amplifier, when the number of the electromagnetic loading guns is at least three, the electromagnetic loading guns are arranged in an array mode, compression stress waves are generated through the electromagnetic loading guns, and the resonance plate is arranged on the resonance plate; the electromagnetic loading gun is connected with an amplifier, the amplifier is mounted on the resonant plate, a to-be-detected sample is arranged on the other side of the resonant plate, compression stress waves generated by the electromagnetic loading gun are transmitted to the resonant plate through the amplifier, and a dynamic response test is performed on the to-be-detected sample on the other side of the resonant plate. The electromagnetic loading gun adopts an independent charging and discharging circuit and adopts the same control circuit, and synchronous loading of the electromagnetic loading gun is controlled by arranging a delay signal generator. According to the invention, loading is directly carried out on the resonant plate through the electromagnetic loading gun, the time controllability is good, and a large-load wide-frequency-domain impact experiment is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of impact experiments, and in particular relates to a large-load wide-frequency domain impact experiment device and method. Background Art

[0002] In the fields of aerospace, vehicle engineering, ship engineering, etc., it is often necessary to test the changes in performance parameters of a system's structure and its loaded components under impact loads, especially the safety and reliability under large load environments. This requires relevant experiments, but if structural experiments are conducted based on actual conditions, it usually consumes a lot of manpower, material resources and financial resources, and is extremely inefficient. Therefore, simulation experiments are often used in actual situations. The currently commonly used impact simulation experiment method mainly uses the air cannon simulation experiment method.

[0003] The experimental device implements loading through the instantaneous release of high-pressure gas, thereby driving the bullet in the launch tube to move and complete the impact. Although the impact experiment has become increasingly mature, it still has many shortcomings and deficiencies. For example, the impact time of the air cannon on the sample is not controllable, and the maximum load that the air cannon can reach is also very limited. Even if multiple groups of air cannons are coordinated to load to increase the impact load, different air cannons still have great disadvantages in the synchronization of impact or the controllability of asynchronous loading; and the air cannon requires manual control of inflation, the air pressure adjustment error is large, and the repeatability of the experiment cannot be perfectly guaranteed. In an impact environment where controllable continuous large loads need to be considered, air cannons cannot meet the needs.

[0004] Based on this, a large-load and wide-frequency domain impact test device and method are proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a large-load wide-frequency domain impact test device and method in view of the deficiencies of the above-mentioned prior art, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] In the first aspect, a large-load wide-frequency-domain impact experimental device comprises an electromagnetic loading gun, a resonant plate, and an amplifier;

[0008] Among them, at least one electromagnetic loading gun is provided, and a compressive stress wave is generated by the electromagnetic loading gun. The electromagnetic loading gun is connected to an amplifier, and the amplifier is installed on a resonant plate. A sample to be tested is provided on the other side of the resonant plate. The compressive stress wave generated by the electromagnetic loading gun is transmitted to the resonant plate through the amplifier, and a stress wave loading impact test is performed on the sample to be tested on the other side of the resonant plate. The resonant plate not only serves as a stress wave transmission medium, but also can adjust the impact response spectrum characteristics by changing its own stiffness, natural frequency and modal density.

[0009] As a further illustration of the present invention, when the number of the electromagnetic loading guns is at least three, the electromagnetic loading guns are arranged in an array.

[0010] For example, when the number of electromagnetic loading guns is 3, the arrangement is a triangle array; when the number of electromagnetic loading guns is 9, the arrangement is a 3×3 matrix array.

[0011] As a further explanation of the present invention, the electromagnetic loading gun is composed of a loading gun housing, a primary coil, a secondary coil and an insulating layer, wherein the primary coil, the secondary coil and the insulating layer are arranged in the loading gun housing, and an amplifier is arranged outside the insulating layer of the electromagnetic loading gun.

[0012] The amplifier can not only amplify stress waves, but also has a waveform shaping effect. Due to the delay of electronic components in the electromagnetic loading gun, such as the thyristor, the difference in internal circuit parameters, and the inconsistent coupling rate between the induction coils, the loading of multiple electromagnetic loading guns will be asynchronous. Therefore, the time when the trigger circuit sends a signal is regulated by the delay signal generator, and corresponding compensation is made according to the time delay of different loading guns, and the discharge time of the capacitor charger is regulated to ensure that each electromagnetic loading gun generates a load synchronously.

[0013] As a further illustration of the present invention, the primary coil, the secondary coil and the amplifier are all coaxially arranged with the loading gun housing.

[0014] As a further explanation of the present invention, it also includes a power supply and a capacitor charger, the power supply is used to charge the capacitor charger, the capacitor charger is used to discharge the primary coil of the electromagnetic loading gun, an electromagnetic repulsive force is generated between the primary coil and the secondary coil, the electromagnetic repulsive force is amplified by the amplifier and manifests as a compression stress wave, the amplified compression stress wave is transmitted to the resonance plate, thereby realizing stress wave loading.

[0015] In a second aspect, an experimental method of a large-load wide-frequency domain impact experimental device comprises the following steps:

[0016] The electromagnetic loading gun and the amplifier are respectively installed on the resonance plate, and then the sample to be tested is set on the other side of the resonance plate, and then the capacitor charger is charged by a power supply, and the capacitor charger discharges the primary coil of the electromagnetic loading gun, and an electromagnetic repulsive force is generated between the primary coil of the electromagnetic loading gun and the secondary coil of the electromagnetic loading gun. The electromagnetic repulsive force is amplified by the amplifier and manifests as a compression stress wave. The amplified compression stress wave is transmitted to the resonance plate, and the stress wave loading experiment of the sample to be tested is realized through the resonance plate.

[0017] As a further explanation of the present invention, the electromagnetic loading gun adopts an independent charging and discharging circuit, and the charging and discharging circuit signals of the electromagnetic loading gun are connected to the same control circuit. The control circuit controls the charging and discharging circuit of the electromagnetic loading gun through the equipped delay signal generator, thereby completing the control of the discharge time of the electromagnetic loading gun and completing the synchronous loading operation of the electromagnetic loading gun.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The present invention directly loads the resonance plate through an electromagnetic loading gun, has good time controllability, and can realize simultaneous loading of multiple electromagnetic loading guns compared to an air cannon, producing a load superposition effect, breaking through the limit of a single electromagnetic loading gun, and realizing a large-load wide-frequency domain impact experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a time domain diagram of the acceleration response spectrum generated by electromagnetic loading implemented by arrays consisting of one, three, and nine electromagnetic loading guns in the embodiments of the present invention;

[0022] Figure 3 is a frequency domain diagram of the acceleration response spectrum generated by electromagnetic loading implemented by arrays consisting of one, three, and nine electromagnetic loading guns in the embodiments of the invention;

[0023] Figure 4 It is a time domain diagram of the acceleration response spectrum generated by loading the resonant plate with an array composed of one, three and nine electromagnetic loading guns in the embodiments of the invention;

[0024] Figure 5 It is a frequency domain diagram of the acceleration response spectrum generated by loading the resonance plate with an array composed of one, three and nine electromagnetic loading guns in the embodiments of the invention.

[0025] Description of reference numerals:

[0026] 1-Electromagnetic loading gun; 2-Resonance plate; 3-Amplifier; 4-Sample to be tested. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figure 1 As shown, the present invention provides a technical solution: a large-load wide-frequency domain impact test device, comprising an electromagnetic loading gun 1, a resonant plate 2 and an amplifier 3;

[0029] There is at least one electromagnetic loading gun 1 , and during specific use, the number of electromagnetic loading guns 1 can be one to nine.

[0030] A compressive stress wave is generated by the electromagnetic loading gun 1, and the electromagnetic loading gun 1 is connected to an amplifier 3, which is installed on a resonance plate 2. A sample 4 to be tested is provided on the other side of the resonance plate 2. The compressive stress wave generated by the electromagnetic loading gun 1 is transmitted to the resonance plate 2 through the amplifier 3, and a stress wave loading impact experiment is performed on the sample 4 to be tested on the other side of the resonance plate 2.

[0031] The electromagnetic loading gun 1 is composed of a loading gun housing, a primary coil, a secondary coil and an insulating layer. The primary coil, the secondary coil and the insulating layer are arranged in the loading gun housing. The primary coil, the secondary coil and the amplifier 3 are all coaxially arranged with the loading gun housing.

[0032] An amplifier 3 is disposed outside the electromagnetic loading gun 1 .

[0033] The power supply is used to charge the capacitor charger, and the capacitor charger is used to discharge the primary coil of the electromagnetic loading gun 1. The secondary coil is not charged, but an induced eddy current is generated inside. An electromagnetic repulsive force is generated between the primary coil and the secondary coil. The electromagnetic repulsive force is amplified by the amplifier and manifests as a compression stress wave. The amplified compression stress wave is transmitted to the resonance plate, thereby realizing stress wave loading.

[0034] The experimental method of the above-mentioned large-load wide-frequency impact test device includes the following steps:

[0035] The electromagnetic loading gun 1 and the amplifier 3 are respectively installed on the resonance plate 2, and then the sample 4 to be tested is set on the other side of the resonance plate 2, and then the capacitor charger is charged by the power supply, and the capacitor charger discharges the primary coil of the electromagnetic loading gun 1, and the induced eddy current is generated inside the secondary coil, and the electromagnetic repulsion force is generated between the primary coil of the electromagnetic loading gun 1 and the secondary coil of the electromagnetic loading gun 1. The electromagnetic repulsion force is amplified by the amplifier 3 and manifested as a compression stress wave. The amplified compression stress wave is transmitted to the resonance plate 2, thereby realizing the stress wave loading experiment of the sample 4 to be tested. The array composed of different numbers of electromagnetic loading guns 1 can realize large load impact loading, and the time controllability is good, and multiple electromagnetic loading guns 1 can be loaded simultaneously.

[0036] Each electromagnetic loading gun uses an independent charging and discharging circuit to control the discharge time. The charging and discharging circuit signals of all electromagnetic loading guns are connected to the same control circuit. The control circuit controls the charging and discharging circuit of electromagnetic loading gun 1 through the equipped delay signal generator, thereby completing the control of the discharge time of electromagnetic loading gun 1 and completing the synchronous loading operation of the electromagnetic loading guns.

[0037] The acceleration response spectra generated by the electromagnetic loading implemented by the array consisting of one, three and nine electromagnetic loading guns 1 are shown in the time domain diagram as follows: Figure 2 shown.

[0038] By comparing the acceleration response spectra obtained after loading of arrays composed of different numbers of electromagnetic loading guns, it can be seen that when the number of electromagnetic loading guns is increased to 9, the transient peak value of acceleration is significantly improved.

[0039] In the time domain, the peak acceleration that can be achieved by a single loading gun is: 1347.75g; three loading guns loading at the same time is 2422.53g; nine loading guns are 5007.43g. This is something that an air cannon cannot achieve, that is, this embodiment can achieve a loading of the order of 5000g.

[0040] The acceleration response spectra generated by electromagnetic loading implemented by arrays consisting of one, three, and nine electromagnetic loading guns 1, i.e., frequency domain diagrams are shown in FIG. Figure 3 As shown;

[0041] It can be seen that this embodiment can not only realize electromagnetic loading in a wide frequency domain, but also 3 ~10 4 In the Hz range, the maximum acceleration that can be achieved by an array of nine loading guns is 7095.41g, far exceeding the maximum acceleration that can be exerted by one loading gun (1893.13g) and the 4206.36g of three loading guns.

[0042] The resonance plate is loaded by an array consisting of one, three, and nine electromagnetic loading guns 1, and the resulting acceleration response time domain spectrum is as follows: Figure 4 The generated acceleration response frequency domain spectrum is shown as Figure 5 shown.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large load and wide frequency domain impact test device, characterized in that: It comprises an electromagnetic loading gun (1), a resonance plate (2) and an amplifier (3); Wherein, at least one electromagnetic loading gun (1) is provided, and when the number of the electromagnetic loading guns (1) is not less than three, the electromagnetic loading guns (1) are arranged in an array; A compressive stress wave is generated by the electromagnetic loading gun (1), the electromagnetic loading gun (1) is connected to an amplifier (3), the amplifier (3) is mounted on a resonance plate (2), a sample to be tested (4) is arranged on the other side of the resonance plate (2), the compressive stress wave generated by the electromagnetic loading gun (1) is transmitted to the resonance plate (2) through the amplifier (3), and a stress wave loading impact experiment is performed on the sample to be tested (4) on the other side of the resonance plate (2).

2. A large load and wide frequency domain impact test device according to claim 1, characterized in that: The electromagnetic loading gun (1) is composed of a loading gun housing, a primary coil, a secondary coil and an insulating layer, wherein the primary coil, the secondary coil and the insulating layer are arranged in the loading gun housing, and an amplifier (3) is arranged outside the insulating layer of the electromagnetic loading gun (1).

3. A large load and wide frequency domain impact test device according to claim 2, characterized in that: The primary coil, the secondary coil and the amplifier (3) are all coaxially arranged with the loading gun housing.

4. A large load and wide frequency domain impact test device according to claim 2, characterized in that: It also includes a power supply and a capacitor charger, wherein the power supply is used to charge the capacitor charger, and the capacitor charger is used to discharge the primary coil of the electromagnetic loading gun (1), so that an electromagnetic repulsive force is generated between the primary coil and the secondary coil, and the electromagnetic repulsive force is amplified by the amplifier (3) and manifests as a compression stress wave, and the amplified compression stress wave is transmitted to the resonance plate, thereby realizing stress wave loading.

5. The experimental method of a large-load wide-band impact test device according to any one of claims 1 to 4, characterized in that: The following steps are involved: The electromagnetic loading gun (1) and the amplifier (3) are respectively mounted on the resonance plate (2), and then the sample (4) to be tested is placed on the other side of the resonance plate (2), and then the capacitor charger is charged by a power supply. After the capacitor charger is fully charged, the capacitor charger discharges the primary coil of the electromagnetic loading gun (1), thereby generating induced eddy currents inside the secondary coil of the electromagnetic loading gun (1), and an electromagnetic repulsive force is generated between the primary coil of the electromagnetic loading gun (1) and the secondary coil of the electromagnetic loading gun (1). The electromagnetic repulsive force is amplified by the amplifier (3) and manifested as a compression stress wave. The amplified compression stress wave is transmitted to the resonance plate (2), and a stress wave loading experiment of the sample (4) to be tested is realized through the resonance plate (2).

6. The experimental method of a large-load wide-frequency impact test device according to claim 5 is characterized in that: The electromagnetic loading gun (1) uses an independent charging and discharging circuit to control the discharge time, and the charging and discharging circuit signals of the electromagnetic loading gun (1) are connected to the same control circuit. The control circuit controls the charging and discharging circuit of the electromagnetic loading gun (1) through an equipped delay signal generator, thereby completing the control of the discharge time of the electromagnetic loading gun (1) and completing the synchronous loading operation of the electromagnetic loading gun.

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