Air cannon impact test device with low knee frequency

Abstract

This invention relates to an air cannon impact testing device with a low inflection point frequency, comprising a projectile, an air cannon launcher, a support frame, and a double-layer resonant assembly; wherein, the support frame has a mounting cavity and an open end communicating with the mounting cavity, the air cannon launcher is mounted in the mounting cavity, and the firing port of the air cannon launcher faces the open end; the double-layer resonant assembly includes a first resonant steel plate, a second resonant steel plate, and pads, the first resonant steel plate spans the open end and is detachably connected to the open end, the upper and lower ends of the pads are detachably connected to the second resonant steel plate and the first resonant steel plate, respectively, and there are multiple pads distributed along the stress area of ​​the second resonant steel plate, and the side of the second resonant steel plate opposite to the pads has a mounting surface for mounting the test specimen.

Description

Technical Field

[0001] This invention relates to the field of impact testing technology, and more specifically, to an air gun impact testing device with a low inflection point frequency. Background Technology

[0002] The gas gun test system accelerates the projectile by using compressed gas instead of the high-pressure gas generated during the explosion of gunpowder, explosives, and various explosives. The impact process is simulated by the projectile striking a resonant steel plate. The projectile, accelerated by the high-pressure gas, reaches a very high velocity, generating tremendous impact force upon impact with the resonant steel plate. Therefore, to obtain the performance parameters of the test piece in higher-level impact mechanics environments, high-level impact response spectrum simulation tests are generally conducted using a gas gun test system.

[0003] When simulating high-magnitude, low-inflection-frequency impact response spectrum tests, the inflection frequency is generally above 700Hz due to factors such as the thickness of the resonant steel plate. To lower the inflection frequency, the thickness of the resonant steel plate must be reduced. However, in experiments, the thickness of the resonant steel plate cannot be infinitely small. Therefore, for some high-magnitude, low-inflection-frequency impact response spectrum tests, ordinary impact testing systems are difficult to meet the requirements of such impact response spectrum tests. Summary of the Invention

[0004] The purpose of this invention is to provide an air gun impact testing device with a low inflection point frequency to solve the problems existing in related technologies.

[0005] An air gun impact test device with a low inflection point frequency includes: a projectile, an air gun launcher, a support frame, and a double-layer resonant assembly. The support frame is provided with a mounting cavity and an open end communicating with the mounting cavity. The air gun launcher is installed in the mounting cavity, and the firing port of the air gun launcher faces the open end. The double-layer resonant assembly includes a first resonant steel plate, a second resonant steel plate, and a pad. The first resonant steel plate spans the opening end and is detachably connected to the opening end. The upper and lower ends of the pad are detachably connected to the second resonant steel plate and the first resonant steel plate, respectively. There are multiple pads, which are distributed along the stress area of ​​the second resonant steel plate. The side of the second resonant steel plate away from the pads has an mounting surface for mounting the test sample.

[0006] Optionally, the second resonant steel plate is fixedly connected to the pad by a detachable fastener, and both the first resonant steel plate and the second resonant steel plate are flat metal structural components.

[0007] Optionally, the first resonant steel plate has flange edges at both ends, and the flange edges are fixedly installed on the left and right sides of the opening end of the support frame by bolts and fasteners.

[0008] Optionally, the pad is available in various height sizes.

[0009] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: The inflection point frequency of the impact response spectrum is essentially determined by the inherent resonant frequency of the resonant components, which varies with the system's equivalent bending stiffness. This device employs a double-layer resonant component. The first and second resonant steel plates, along with the pads, are all detachable, allowing for adjustments to the thickness of the resonant steel plates, the number of pads, and the distribution of stress areas. This flexibly alters the equivalent bending stiffness of the double-layer resonant system, thereby continuously adjusting the resonant natural frequency. Addressing the challenge of conventional impact systems balancing high impact magnitude with low inflection point frequencies, this device effectively lowers the system's natural frequency using a double-layer structure while maintaining a sufficiently thick first resonant steel plate to withstand high-magnitude projectile impacts, thus achieving a balance between high impact magnitude and low inflection point frequencies.

[0010] Compared to single-layer resonant steel plates, the assembled double-layer resonant steel plates can effectively reduce the resonant frequency. This device has simple and readily available components, requiring no additional tooling; it can be implemented using existing parts, ensuring good economy and durability. Through simple assembly and debugging, impact response spectrum tests at various inflection frequencies within the low-frequency range can be completed, eliminating the need for multiple sets of dedicated resonant tooling, significantly reducing overall testing costs, shortening the time required for switching operating conditions, and adapting to the low-frequency impact environment verification needs of various product models. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a front view of an air gun impact test apparatus with a low inflection point frequency, as illustrated in an exemplary embodiment of this disclosure.

[0012] Explanation of reference numerals in the attached figures 1. Projectile; 2. Pad block; 3. First resonant steel plate; 4. Second resonant steel plate; 5. Air cannon launcher; 6. Support frame. Detailed Implementation

[0013] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0014] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" are used for ease of description based on the drawing orientations of the corresponding figures, while "inner" and "outer" are defined based on the contours of the corresponding components themselves. Terms such as "first" and "second" used in this disclosure are used to distinguish one element from another and do not have sequential or importance implications. Furthermore, when the following description refers to the figures, unless otherwise indicated, the same numbers in different figures represent the same or similar elements.

[0015] Please see Figure 1 This disclosure provides an air gun impact test device with a low inflection point frequency, including: a projectile 1, an air gun launcher 5, a support frame 6, and a double-layer resonant assembly. The support frame 6 is provided with a mounting cavity and an open end connected to the mounting cavity. The air cannon launcher 5 is installed in the mounting cavity, and the firing port of the air cannon launcher 5 faces the open end. The double-layer resonant assembly includes a first resonant steel plate 3, a second resonant steel plate 4, and a pad 2. The first resonant steel plate 3 spans the opening end and is detachably connected to the opening end. The upper and lower ends of the pad 2 are detachably connected to the second resonant steel plate 4 and the first resonant steel plate 3, respectively. There are multiple pads 2, which are distributed along the stress area of ​​the second resonant steel plate 4. The second resonant steel plate 4 has an mounting surface for mounting the test sample on the side away from the pad 2.

[0016] In one embodiment, the second resonant steel plate 4 is fixedly connected to the pad block 2 by a detachable fastener, and both the first resonant steel plate 3 and the second resonant steel plate 4 are flat metal structural components.

[0017] In one embodiment, the first resonant steel plate 3 has flange edges at both ends, and the flange edges are fixedly installed on the left and right sides of the opening end of the support frame 6 by bolt fasteners.

[0018] In one embodiment, the pad 2 is available in various height sizes.

[0019] Innovation of this invention: Innovation Point 1: This device enables the testing of impact response spectra with low inflection point frequencies and high magnitudes, greatly expanding the capability of simulated impact testing.

[0020] Its beneficial effects are as follows: due to the limited thickness of the resonant steel plate, it is impossible to achieve impact response spectrum tests with lower inflection frequency. However, this invention can reduce the inflection frequency to below 500Hz, with good low-frequency effect and can be reused, greatly expanding the ability to achieve impact tests.

[0021] Innovation Point 2: By adjusting the resonant steel plate and pad, impact response spectrum tests with different low inflection point frequencies and high magnitude requirements can be achieved.

[0022] Its beneficial effects are as follows: the value of the inflection point frequency of the air gun impact response spectrum is related to the resonant frequency of the resonant steel plate. According to different test conditions, this device can adjust the thickness of the resonant steel plate and the position, quantity and specifications of the pads, thereby adjusting the resonant frequency of the resonant steel plate. Through simple debugging, various impact response spectrum tests with different inflection point frequencies in a low frequency range can be achieved, which greatly reduces the test cost and saves the test time.

[0023] Innovation Point 3: This device can also be extended to other engineering implementation systems for shock response spectrum testing.

[0024] Its beneficial effects are as follows: Commonly used shock response spectrum testing devices require relatively high inflection point frequencies, and in actual use, a lot of time is spent on debugging. However, the double-layer resonant plate configuration in this invention can also be used in other shock response spectrum testing devices to achieve shock response spectrum testing with low inflection point frequencies and medium magnitude, with good results.

[0025] Innovation Point 4: This experimental device has a simple and durable structure, and its components are readily available and inexpensive.

[0026] Its beneficial effects are as follows: In addition to meeting the test requirements of high-level and low-inflection-point frequency impact response spectrum, this test device has a simple structure, readily available materials, good performance, and good economy and durability.

[0027] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0028] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0029] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An air gun impact testing device with a low inflection point frequency, characterized in that, include: The projectile (1), the air gun launcher (5), the support frame (6), and the double-layer resonant assembly; The support frame (6) is provided with a mounting cavity and an open end connected to the mounting cavity. The air gun launcher (5) is installed in the mounting cavity, and the firing port of the air gun launcher (5) faces the open end. The double-layer resonant assembly includes a first resonant steel plate (3), a second resonant steel plate (4), and a pad (2). The first resonant steel plate (3) spans the opening end and is detachably connected to the opening end. The upper and lower ends of the pad (2) are detachably connected to the second resonant steel plate (4) and the first resonant steel plate (3), respectively. There are multiple pads (2), and the multiple pads (2) are distributed along the stress area of ​​the second resonant steel plate (4). The second resonant steel plate (4) has an installation plane for mounting the test sample on the side away from the pad (2).

2. The air gun impact test device with low inflection point frequency according to claim 1, characterized in that, The second resonant steel plate (4) is fixedly connected to the pad (2) by a detachable fastener, and both the first resonant steel plate (3) and the second resonant steel plate (4) are flat metal structural parts.

3. The air gun impact test device with low inflection point frequency according to claim 2, characterized in that, The first resonant steel plate (3) has flange edges at both ends, and the flange edges are fixedly installed on the left and right sides of the opening end of the support frame (6) by bolt fasteners.

4. The air gun impact test device with low inflection point frequency according to claim 3, characterized in that, The pad (2) is available in various height sizes.

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