A negative wave generating device and a double-wave impact test equipment

Abstract

The present invention provides a negative wave generating device and a double-wave impact test equipment. The negative wave generating device includes a force-receiving platform, a negative wave generating assembly, and a support platform. The negative wave generating assembly is connected between the force-receiving platform and the support platform. A load member is adapted to be placed on a side of the force-receiving platform away from the negative wave generating assembly. The support platform supports the force-receiving platform. The force-receiving platform is configured to move relative to the support platform along an impact direction under an external force impact. The negative wave generating assembly is configured to generate a negative half-sine pulse wave under the pulling of the force-receiving platform. By placing the load member on the side of the force-receiving platform away from the negative wave generating assembly, that is, the negative wave generating assembly and the load member are arranged on both sides of the force-receiving platform, the space for placing the load member on the force-receiving platform is increased, and the load of the negative wave generating device is improved to meet the requirements of current anti-shock design and research of large warships.

Description

Technical Field

[0001] The present invention relates to the technical field of impact test of positive and negative double pulse waves, and particularly relates to a negative wave generating device and a double wave impact test equipment. Background Art

[0002] In underwater non-contact explosion shock, in addition to the shock incident wave, there are also subsequent cavitation pulsation, water hammer, etc. In view of the particularity of underwater non-contact explosion shock, in order to accurately simulate the underwater explosion shock environment, various countries have successively adopted the double wave impact test method to replace the traditional single pulse impact test method, and have accordingly formulated corresponding test standards, such as BV043 / 85, etc.

[0003] As shown in the appendix Figure 1 The double wave impact test method requires that the impact input form be positive and negative double pulse waves and an impact spectrum; Figure 1 In, d0, v0, and a0 are respectively the spectral displacement, spectral velocity, and spectral acceleration of the impact spectrum; f1 and f2 are respectively the starting and ending frequencies of the spectral velocity in the impact spectrum, where f1 = v0 / (2πd0), f2 = a0 / (2πv0); a2 and a4 are respectively the peak accelerations of the positive wave and the negative wave; V1 and V2 are respectively the velocity change amounts of the positive wave and the negative wave, and it is required that V1 = V2; Figure 1 (b), t2, t3, t4, and t5 respectively correspond to the peak points and pulse widths of the positive triangular wave and the negative triangular wave; Figure 1 (c), t1 and t2 are respectively the pulse widths of the positive half-sine wave and the negative half-sine wave.

[0004] Currently, in the prior art, a hydraulic damper is mostly used as a negative wave generator to conduct in-depth research on the double wave impact test method and develop a test prototype. The hydraulic damper is mostly arranged on the same side of the object to be tested, resulting in limited placement space for the object to be tested in the above test prototype, leading to a small load of the test prototype, and it can no longer meet the requirements of current anti-shock design and research of large ships. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that in the prior art, a hydraulic damper is mostly used as a negative wave generator to conduct in-depth research on the double wave impact test method and develop a test prototype. The hydraulic damper is mostly arranged on the same side of the object to be tested, resulting in limited placement space for the object to be tested in the above test prototype, leading to a small load of the test prototype, and it can no longer meet the requirements of current anti-shock design and research of large ships.

[0006] For this reason, the present invention provides a negative wave generating device, including:

[0007] A force receiving platform;

[0008] Negative wave generating assembly and support platform, the negative wave generating assembly is connected between the force receiving platform and the support platform, the support platform supports the force receiving platform, the side of the force receiving platform away from the negative wave generating assembly is adapted to place a load, the force receiving platform is configured to move relative to the support platform along the impact direction under an external impact, and the negative wave generating assembly is configured to generate a negative half-sine pulse wave when pulled by the force receiving platform.

[0009] Optionally, the negative wave generating assembly includes:

[0010] A plurality of negative wave generators, the mounting ends of the negative wave generators are connected to the support platform;

[0011] A plurality of impact buffers, the impact buffers are connected between the acting ends of the negative wave generators and the force receiving platform, the impact buffers are configured to be elastically deformed when extruded by the force receiving platform, and after the impact buffers are elastically deformed, the force receiving platform pulls the negative wave generators to generate a negative half-sine pulse wave.

[0012] Optionally, the negative wave generator includes:

[0013] A housing body, fixedly connected to the support platform, the housing body has a sealed cavity, and the impact buffer is arranged between the housing body and the force receiving platform;

[0014] A piston, arranged in the sealed cavity, the radial periphery of the piston is slidably connected to the inner side wall of the sealed cavity to divide the sealed cavity into a first sealed cavity and a second sealed cavity, and the piston is provided with a vent hole;

[0015] A piston shaft, one end of which is connected to the piston, and the other end of the piston shaft passes through the housing body and is connected to the force receiving platform;

[0016] Wherein, when the force receiving platform moves along the impact direction under the external impact, the buffer drives the piston shaft and the piston to move along the impact direction, so as to drive the medium in the first sealed cavity to flow through the vent hole towards the second sealed cavity.

[0017] Optionally, the negative wave generator further includes an adjusting rod, the adjusting rod is arranged in the vent hole, and there is a flow gap between the adjusting rod and the side wall of the vent hole, and the flow gap is adapted to communicate the first sealed cavity and the second sealed cavity.

[0018] Optionally, a plurality of mounting cavities are arranged on one side of the force receiving platform;

[0019] The negative wave generator further includes a cylinder head, connected to the end of the piston shaft away from the piston, the cylinder head is arranged in the mounting cavity, and the cylinder head can slide in the mounting cavity;

[0020] The impact buffer is disposed in the installation cavity and sleeved on the piston shaft, and the impact buffer is connected between the inner wall of the installation cavity and the cylinder ram.

[0021] Optionally, the impact buffer includes a plurality of buffer pads;

[0022] The force-receiving platform further includes a plurality of stoppers disposed on the side wall of the installation cavity, and the stoppers are used to abut against a plurality of the buffer pads so that the plurality of buffer pads are sleeved on the piston shaft in a ring shape.

[0023] Optionally, the negative wave generator further includes a plurality of adjusting members;

[0024] Before the force-receiving platform is impacted by an external force, one end of the adjusting member abuts against the force-receiving platform, and the other end of the adjusting member is connected to the support platform to adjust the distance between the support platform and the force-receiving platform;

[0025] After the force-receiving platform is impacted by an external force, one end of the adjusting member is connected to the support platform, and the other end of the adjusting member is separated from the force-receiving platform.

[0026] Optionally, the negative wave generator further includes a plurality of reset buffers disposed between the force-receiving platform and the support platform;

[0027] The impact direction has a component in the gravity direction of the force-receiving platform. After the impact of the external force on the force-receiving platform ends, the force-receiving platform moves under its own gravity, and the buffer is used to buffer the force-receiving platform.

[0028] A double-wave impact test device, comprising:

[0029] A propulsion device;

[0030] A negative wave generating device, which is the negative wave generating device according to any one of claims 1-8;

[0031] An impact device, connected to the propulsion device and spaced apart from the negative wave generating device, and the impact device is configured to move towards the negative wave generating device under the drive of the propulsion device;

[0032] A positive wave generating device, connected to the impact device, and the positive wave generating device is configured to move synchronously with the impact device;

[0033] Wherein, the negative wave generating device is configured to generate a negative half-sine pulse wave when impacted by the positive wave generating device, and the positive wave generating device is configured to impact the negative wave generating device to generate a positive half-sine pulse wave.

[0034] Optionally, the propulsion device includes:

[0035] Gas storage tank;

[0036] A driving cylinder, which is communicated with the gas storage tank, the driving cylinder is connected with the impact device, and the driving cylinder is configured to be driven by the gas in the gas storage tank, so as to push the impact device to move;

[0037] A quick release valve, which is connected between the gas storage tank and the driving cylinder;

[0038] A plurality of exhaust buffer tanks, which are communicated with the driving cylinder. After the impact device impacts the negative wave generating device, the gas in the driving cylinder is released into the exhaust buffer tanks.

[0039] The technical solution provided by the present invention has the following advantages:

[0040] 1. The present invention provides a negative wave generating device, which includes a force receiving platform, a negative wave generating assembly and a support platform. The negative wave generating assembly is connected between the force receiving platform and the support platform. One side of the force receiving platform away from the negative wave generating assembly is suitable for placing a load member. The support platform supports the force receiving platform. The force receiving platform is configured to move relative to the support platform along the impact direction under the action of an external force, and the negative wave generating assembly is configured to generate a negative half-sine pulse wave under the pulling of the force receiving platform.

[0041] For the negative wave generating device with this structure, a force receiving platform, a negative wave generating assembly and a support platform are provided. The support platform can support the force receiving platform. The negative wave generating assembly is connected between the force receiving platform and the support platform. The force receiving platform is configured to move relative to the support platform along the impact direction under the action of an external force, and the negative wave generating assembly is configured to generate a negative half-sine pulse wave under the pulling of the force receiving platform. By placing the load member on one side of the force receiving platform away from the negative wave generating assembly, that is, the negative wave generating assembly and the load member are arranged on both sides of the force receiving platform, the space for placing the load member on the force receiving platform is increased, and the load of the negative wave generating device is improved.

[0042] 2. The present invention provides a negative wave generating device. The negative wave generating assembly includes a plurality of negative wave generators and a plurality of impact buffer members. The installation end of the negative wave generator is connected with the support platform. The impact buffer member is connected between the acting end of the negative wave generator and the force receiving platform. The impact buffer member is configured to generate elastic deformation under the extrusion of the force receiving platform, and after the impact buffer member generates elastic deformation, the force receiving platform pulls the negative wave generator to generate a negative half-sine pulse wave.

[0043] The negative wave generating device of this structure is constructed by setting a number of negative wave generators and a number of impact buffers. The installation end of the negative wave generator is connected to the support platform, and the impact buffer is connected between the acting end of the negative wave generator and the force receiving platform. In the present invention, the negative wave generating assembly is constructed by using the negative wave generator and the impact buffer. The negative pulse wave is generated by the combined action of the impact buffer and the negative wave generator. By adjusting the air pressure and balanced flow rate of the impact buffer and the negative wave generator, an approximate half-sine negative wave with different index requirements can be achieved.

[0044] 3. The present invention provides a negative wave generating device. The negative wave generator further includes an adjusting rod disposed in the air vent hole. A flow gap is provided between the adjusting rod and the side wall of the air vent hole, and the flow gap is adapted to communicate the first sealing cavity and the second sealing cavity.

[0045] The negative wave generating device of this structure is provided with an adjusting rod in the air vent hole. By replacing adjusting rods with different diameters, the gap width between the adjusting rod and the side wall of the air vent hole can be adjusted, so as to achieve the purpose of controlling the medium flow rate in the air vent hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 It is a waveform synthesis schematic diagram of the shock spectrum and its equivalent time-domain positive and negative double waves in the prior art;

[0048] Figure 2 It is a schematic diagram of the overall structure of the negative wave generating device and the double-wave impact test equipment provided in the embodiment of the present invention;

[0049] Figure 3 It is a top view of the force receiving platform and the negative wave generating assembly in the negative wave generating device provided in Embodiment 1 of the present invention;

[0050] Figure 4 It is a schematic diagram of the structure of the force receiving platform in the negative wave generating device provided in Embodiment 1 of the present invention;

[0051] Figure 5 It is a schematic diagram of the structure of the force receiving platform and the negative wave generating assembly in the negative wave generating device provided in Embodiment 1 of the present invention;

[0052] Figure 6 For Figure 5Schematic diagram of the position structure of the negative wave generator at the middle circle A and the installation cavity in the force-bearing platform;

[0053] Figure 7 Schematic diagram of the structure of the impact buffer in the negative wave generating device provided in Embodiment 1 of the present invention;

[0054] Figure 8 Schematic diagram of the structure of the negative wave generator in the negative wave generating device provided in Embodiment 1 of the present invention;

[0055] Figure 9 Schematic diagram of the overall installation structure of the negative wave generating device and the double-wave impact test equipment provided in the embodiments of the present invention;

[0056] Explanation of reference numerals:

[0057] 1 - Force-bearing platform; 11 - Installation cavity; 12 - Stopper;

[0058] 2 - Support platform;

[0059] 3 - Negative wave generator; 31 - Housing body; 311 - Protection pad; 312 - Air inlet; 313 - Upper cover; 314 - Cylinder body; 315 - Lower cover; 32 - Piston; 33 - Piston shaft; 34 - Cylinder head; 35 - Adjusting rod; 36 - Adjusting member; 37 - Reset buffer; 38 - Guide post;

[0060] 4 - Impact buffer; 41 - Buffer pad;

[0061] 5 - Impact device;

[0062] 6 - Positive wave generating device;

[0063] 7 - Gas storage tank;

[0064] 8 - Driving cylinder;

[0065] 9 - Exhaust buffer tank; Detailed implementation manners

[0066] Next, the technical solutions of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0067] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0068] Embodiment 1

[0069] This embodiment provides a negative wave generating device, as Figures 2 to 8 shown, which includes a force-receiving platform 1, a negative wave generating assembly, and a support platform 2. Among them, the negative wave generating assembly is connected between the force-receiving platform 1 and the support platform 2. The side of the force-receiving platform 1 away from the negative wave generating assembly is used to place a load member, and a through hole is provided in the middle of the support platform 2.

[0070] As Figure 2 、 Figure 3 and Figure 6 shown, the negative wave generating assembly includes a negative wave generator 3 and an impact buffer 4. As Figure 8 and Figure 6 shown, the negative wave generator 3 includes a housing body 31, a piston 32, a piston shaft 33, and a cylinder head 34. Among them, the housing body 31 includes an upper cover 313, a cylinder body 314, and a lower cover 315. The upper cover 313 and the lower cover 315 are arranged on both sides of the cylinder body 314. The piston 32 is arranged inside the cylinder body 314 and is slidably connected to the side wall of the cylinder body 314. One end of the piston shaft 33 is fixedly connected to the piston 32, and the other end of the piston shaft 33 passes through the upper cover 313 and is fixedly connected to the cylinder head 34. An air inlet 312 is provided on one side of the upper cover 313, and a medium can be injected into the cylinder body 314 through the air inlet 312.

[0071] As Figures 4 to 6As shown in the figure, a plurality of mounting cavities 11 are provided on one side of the force-receiving platform 1. The cylinder ram 34 is disposed in the mounting cavity 11 and is movable inside the mounting cavity 11. The impact buffer 4 is sleeved on the piston shaft 33, and the impact buffer 4 is disposed between the cylinder ram 34 and the bottom wall of the mounting cavity 11. When the force-receiving platform 1 is impacted by an external force and moves relative to the support platform 2 in the impact direction (where the impact direction is the direction away from the support platform 2), the force-receiving platform 1 moving in the impact direction will squeeze the impact buffer 4 through the mounting cavity 11. The impact buffer 4 undergoes elastic deformation. After the impact buffer 4 undergoes elastic deformation, it will squeeze the cylinder ram 34. Thus, the force-receiving platform 1 will pull the cylinder ram 34 to move in the impact direction, and then pull the piston 32 to move in the impact direction inside the cylinder body 314 through the piston shaft 33. The impact buffer 4 is made of polyurethane material and has the advantages of high strength and flexible manufacturing. The stiffness of the impact buffer 4 can be adjusted by adjusting the thickness and hardness parameters of the impact buffer 4.

[0072] Among them, as Figure 6 shown, there is a gap between the top end of the cylinder ram 34 and the top of the mounting cavity 11 on the force-receiving platform 1. When the force-receiving platform 1 is impacted by an external force and moves relative to the support platform 2 in the impact direction, it drives the mounting cavity 11 on the force-receiving platform 1 to pull the cylinder ram 34 on the negative wave generator 3. By providing a gap between the top end of the cylinder ram 34 and the top of the mounting cavity 11 on the force-receiving platform 1, it can be ensured that after the force-receiving platform 1 is impacted by an external force, the force-receiving platform 1 has a free movement time to separate the positive wave and the negative wave, thus ensuring the smooth connection of the positive and negative waves. And during the generation of the negative half-sine pulse wave, the force-receiving platform 1 is only subjected to the pulling force of the negative wave generator 3. Compared with the traditional double-wave impact testing machine, the negative wave generator 3 and the force-receiving platform 1 are connected together. That is, when impacted by an external force, the negative wave generator 3 has already started working. That is, when an external force gives the force-receiving platform 1 an upward force, the negative wave generator 3 simultaneously gives the force-receiving platform 1 a downward force. The two forces act simultaneously, giving the force-receiving platform 1 a bending moment, which is very easy to crack the force-receiving platform 1, especially prominent under large loads. The present invention is applicable to double-wave impact tests under large loads.

[0073] As Figure 8 shown, a sealed cavity is formed between the upper cover 313, the cylinder body 314 and the lower cover 315. The piston 32 divides the sealed cavity into a first sealed cavity and a second sealed cavity. Among them, for the convenience of description, in this embodiment, Figure 8Above the middle piston 32 is defined as the first sealing cavity, and below the piston 32 is defined as the second sealing cavity. The piston 32 is provided with a vent hole. When the piston shaft 33 pulls the piston 32 to move in the cylinder body 314 in the impact direction, the medium inside the first sealing cavity flows into the second sealing cavity through the vent hole. An adjusting rod 35 is arranged inside the vent hole, and there is a flow gap between the adjusting rod 35 and the side wall of the vent hole. By replacing the adjusting rod 35 with different diameters, the purpose of controlling the flow rate of the medium in the vent hole is achieved, thereby controlling the pressure balance time inside the first sealing cavity and the second sealing cavity, and adjusting the falling time of the latter half of the negative half-sine pulse wave. A protective pad 311 is installed at the lower part of the upper cover 313 to prevent the piston shaft 33 from directly colliding with the upper cover 313 after moving upward when the pressure is set too low, ensuring the safety of the negative wave generator 3.

[0074] In some other embodiments, the piston shaft 33 can also pass through the upper cover 313 and the lower cover 315. The piston shaft 33 of the lower cover 315 mainly plays a balancing role. When the pressures on both sides are balanced, the piston shaft 33 has no force and can move freely, enabling the piston 32 to be only affected by gravity and not move upward to collide with the force-receiving platform 1.

[0075] As Figure 6 and Figure 7 shown, the impact buffer 4 includes a plurality of buffer pads 41, and the force-receiving platform 1 further includes several stoppers 12. The stoppers 12 are arranged on the side wall of the installation cavity 11. In order to facilitate the replacement of the impact buffer 4, the impact buffer 4 is set to be composed of a plurality of buffer pads 41 spliced together. During use, the plurality of buffer pads 41 are installed together in the installation cavity 11 below the force-receiving platform 1, and then limited by the stoppers 12 to ensure that the plurality of buffer pads 41 can fit well together. The negative pulse wave is generated by the combined action of the impact buffer 4 and the negative wave generator 3. By adjusting the air pressure and balance flow rate of the impact buffer 4 and the negative wave generator 3, an approximate half-sine negative wave with different index requirements can be achieved.

[0076] As Figure 3 shown, the negative wave generator 3 further includes an adjusting member 36. Before the force-receiving platform 1 is impacted by an external force, one end of the adjusting member 36 abuts against the force-receiving platform 1, and the other end of the adjusting member 36 is connected to the support platform 2 to adjust the distance between the support platform 2 and the force-receiving platform 1; after the force-receiving platform 1 is impacted by an external force, one end of the adjusting member 36 is connected to the support platform 2, and the other end of the adjusting member 36 is separated from the force-receiving platform 1. A laser displacement sensor can also be arranged at the bottom of the force-receiving platform 1 for non-contact measurement of the distance between the force-receiving platform 1 and the support platform 2. Among them, the number of adjusting members 36 is multiple and they are evenly arranged below the force-receiving platform 1. If the load member is eccentrically installed, the adjusting members 36 can also bear the eccentric force, and the multiple evenly arranged adjusting members 36 can be well leveled and can also facilitate the adjustment of the distance between the force-receiving platform 1 and the support platform 2. Among them, the adjusting members 36 are mostly selected as hydraulic jacks.

[0077] As Figure 3 shown, the negative wave generator 3 further includes a reset buffer 37 and a guide post 38. The reset buffer 37 is connected to the bottom of the force-receiving platform 1, which is used to balance the gravity of the force-receiving platform 1 and the load member on the one hand, and to play a buffering role during the downward movement of the force-receiving platform 1 on the other hand; the guide post 38 is connected between the force-receiving platform 1 and the support platform 2 and is used to guide the moving force-receiving platform 1.

[0078] As Figure 4 shown, a plurality of rib structures are provided at the bottom of the force-receiving platform 1, which can improve the stiffness and strength of the force-receiving platform 1 to meet the experimental requirements of large loads.

[0079] In the negative wave generating device of this embodiment, during operation, when the force-receiving platform 1 is impacted by an external force and moves relative to the support platform 2 along the impact direction, the mounting cavity 11 on the force-receiving platform 1 drives the impact buffer 4 to move in the impact direction and impact the cylinder ram 34. The impact buffer 4 is compressed and elastically deformed, generating the first half of the waveform of the negative half-sine pulse wave. As the impact buffer 4 is compressed, when the tensile force increases to the set pressure of the housing body 31, the force-receiving platform 1 drives the piston 32 and the impact buffer 4 to move in the impact direction. During the movement, the medium in the first sealing cavity in the housing body 31 flows into the lower second sealing cavity through the air-permeable holes opened on the piston 32. During the process of the medium flowing, the tensile force difference between the first sealing cavity and the second sealing cavity gradually decreases, resulting in a tensile force that decreases from large to small. At the same time, the compressed impact buffer 4 recovers, obtaining an approximate waveform of the second half of the negative wave. During the entire impact process, the negative wave generator 3 provides a downward resistance, reducing the speed of the force-receiving platform 1 to 0, and completing the negative wave impact process.

[0080] Embodiment 2

[0081] This embodiment provides a double-wave impact test device. As Figure 2 and Figure 9 shown, it includes a propulsion device, a negative wave generating device, an impact device 5, and a positive wave generating device 6. The negative wave generating device is the negative wave generating device in Embodiment 1. The impact device 5 is connected to the propulsion device and is spaced from the negative wave generating device. The impact device 5 is connected to the propulsion device, and the propulsion device drives the impact device 5 to move in the direction of the negative wave generating device. Among them, the impact device 5 includes an impact hammer. The impact hammer is driven by the propulsion device to pass through the through hole in the middle of the support platform 2 and impact below the force-receiving platform 1 in the negative wave generating device. The negative wave generating device is impacted to generate a negative half-sine pulse wave. The positive wave generating device 6 is connected to the impact hammer, and the positive wave generating device 6 impacts the force-receiving platform 1 to generate a positive half-sine pulse wave. Among them, the positive wave generating device 6 is made of polyurethane material, vulcanized on an aluminum backing plate, and installed on the impact hammer by screws.

[0082] As Figure 2As shown in the figure, the propulsion device includes an air storage tank 7, a driving cylinder 8, a quick release valve, and an exhaust buffer tank 9. The driving cylinder 8 is connected to the air storage tank 7 and is connected to the impact device 5. The driving cylinder 8 is configured to be driven by the gas in the air storage tank 7 to push the impact device 5 to move. The quick release valve is connected between the air storage tank 7 and the driving cylinder 8, and the exhaust buffer tank 9 is connected to the driving cylinder 8. After the impact device 5 impacts the negative wave generating device, the gas in the driving cylinder 8 is released into the exhaust buffer tank 9.

[0083] For the double-wave impact test equipment of this embodiment, during operation, it includes the following steps:

[0084] (1) The air storage tank 7 is inflated to the set pressure;

[0085] (2) The quick release valve is opened, and the gas quickly enters the driving cylinder 8. The bottom surface pressure pushes the impact hammer to accelerate in the impact direction;

[0086] (3) After the impact hammer moves to the set stroke, it passes through the through hole on the support table 2 and impacts the bottom surface of the force receiving table 1, generating a positive half-sine pulse wave;

[0087] (4) The side wall of the installation cavity 11 on the force receiving table 1 squeezes the negative wave generating assembly, and under the action of the negative wave generating assembly, a negative half-sine pulse wave is generated;

[0088] (5) The impact hammer rebounds, and at the same time, the gas in the driving cylinder 8 is released into the exhaust air storage tank 7. The piston 32 stays at the pressure-gravity equilibrium point until it stops after balancing;

[0089] (6) Open the exhaust valve of the driving cylinder 8, slowly release the gas in the driving cylinder 8, and the impact hammer slowly descends until it stops after descending to the limit position, completing one impact test.

[0090] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A negative wave generating device, characterized in that, Comprising: A force-receiving platform; A negative wave generating assembly and a support platform, the negative wave generating assembly being connected between the force-receiving platform and the support platform. The side of the force-receiving platform away from the negative wave generating assembly is adapted to place a load member. The support platform supports the force-receiving platform. The force-receiving platform is configured to move relative to the support platform along the impact direction under an external impact, and the negative wave generating assembly is configured to generate a negative half-sine pulse wave when pulled by the force-receiving platform; The negative wave generating assembly includes: A plurality of negative wave generators, the mounting ends of the negative wave generators being connected to the support platform; A plurality of impact buffers, the impact buffers being connected between the acting ends of the negative wave generators and the force-receiving platform. The impact buffers are configured to undergo elastic deformation when squeezed by the force-receiving platform, and after the impact buffers undergo elastic deformation, the force-receiving platform pulls the negative wave generators to generate a negative half-sine pulse wave; A plurality of mounting cavities are provided on one side of the force-receiving platform; The negative wave generator further includes a cylinder head, which is connected to the end of the piston shaft away from the piston. The cylinder head is disposed in the mounting cavity, and the cylinder head can slide in the mounting cavity; The impact buffer is disposed in the mounting cavity and sleeved on the piston shaft, and the impact buffer is connected between the inner wall of the mounting cavity and the cylinder head; Wherein, there is a spacing between the top of the cylinder head and the top of the mounting cavity on the force-receiving platform.

2. The negative wave generating device according to claim 1, characterized in that, The negative wave generator includes: A housing body, fixedly connected to the support platform. The housing body has a sealed cavity, and the impact buffer is disposed between the housing body and the force-receiving platform; A piston, disposed in the sealed cavity. The radial periphery of the piston is slidably connected to the inner side wall of the sealed cavity to divide the sealed cavity into a first sealed cavity and a second sealed cavity. The piston is provided with a vent hole; A piston shaft, one end of which is connected to the piston, and the other end of the piston shaft passes through the housing body and is connected to the force-receiving platform; Wherein, when the force-receiving platform moves along the impact direction under the external impact, the buffer drives the piston shaft and the piston to move along the impact direction, so as to drive the medium in the first sealed cavity to flow through the vent hole towards the second sealed cavity.

3. The negative wave generating device according to claim 2, characterized in that, The negative wave generator further includes an adjusting rod, the adjusting rod is disposed in the vent hole, and there is a flow gap between the adjusting rod and the side wall of the vent hole. The flow gap is adapted to communicate the first sealed cavity and the second sealed cavity.

4. The negative wave generating device according to claim 1, characterized in that, The impact buffer includes a plurality of buffer pads; The force-receiving platform further includes a plurality of stoppers, the stoppers are disposed on the side wall of the mounting cavity, and the stoppers are used to abut against the plurality of buffer pads, so that the plurality of buffer pads are sleeved on the piston shaft in a ring shape.

5. The negative wave generating device according to claim 4, characterized in that, The negative wave generator further includes a plurality of adjusting members; Before the force-receiving platform is impacted by an external force, one end of the adjusting member abuts against the force-receiving platform, and the other end of the adjusting member is connected to the support platform to adjust the spacing between the support platform and the force-receiving platform; After the force-receiving platform is impacted by an external force, one end of the adjusting member is separated from the force-receiving platform, and the other end of the adjusting member is connected to the support platform.

6. The negative wave generating device according to claim 4, characterized in that, The negative wave generator further includes a plurality of reset buffers disposed between the force-receiving platform and the support platform; The impact direction has a component in the gravity direction of the force-receiving platform. After the external force impact on the force-receiving platform ends, the force-receiving platform moves under its own gravity, and the buffer is used to buffer the force-receiving platform.

7. A double wave impact test device, characterized in that, Comprising: A propulsion device; A negative wave generating device, which is the negative wave generating device according to any one of claims 1-6; An impact device, connected to the propulsion device and spaced from the negative wave generating device, and the impact device is configured to move in the direction of the negative wave generating device under the drive of the propulsion device; A positive wave generating device, connected to the impact device, and the positive wave generating device is configured to move synchronously with the impact device; Wherein, the negative wave generating device is configured to generate a negative half-sine pulse wave under the impact of the positive wave generating device, and the positive wave generating device is configured to impact the negative wave generating device to generate a positive half-sine pulse wave.

8. The double wave impact test device according to claim 7, characterized in that, The propulsion device includes: An air storage tank; A driving cylinder, communicated with the air storage tank, the driving cylinder is connected to the impact device, and the driving cylinder is configured to be driven by the gas in the air storage tank to push the impact device to move; A quick release valve, connected between the air storage tank and the driving cylinder; A plurality of exhaust buffer tanks, communicated with the driving cylinder. After the impact device impacts the negative wave generating device, the gas in the driving cylinder is released into the exhaust buffer tanks.

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