Double-wave impact machine and control method thereof

Abstract

The invention provides a double-wave impact machine and a control method thereof, and relates to the technical field of mechanics. According to the double-wave impact machine provided by the invention, a control module is used for sending a first impact signal to a first impact module and sending a second impact signal to a second impact module; the first impact module is used for outputting impact gas to the to-be-detected object after receiving the first impact signal so as to perform negative wave impact; the second impact module is used for outputting positive wave impact to the to-be-detected object after receiving the second impact signal; the data acquisition module is in communication connection with the control module and is used for acquiring impact data of the to-be-detected object and sending the impact data to the control module; the control module is also used for determining an impact spectral line according to the impact data. According to the double-wave impact machine provided by the invention, the energy storage speed of each impact is accelerated. In addition, the waveform of the negative wave impact can be simply controlled by controlling the air pressure of the impact gas, so that the acceleration and the pulse width of each negative wave impact can be accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanics, and particularly to a double-wave impact machine and a control method thereof. Background Art

[0002] Ships in the sea are subject to non-contact explosive attacks by weapons such as torpedoes and underwater bombs. Under the propagation of this explosive energy in the water medium, a series of complex impact loads such as shock waves and bubble pulsations will be generated on the ships. Nowadays, most of the main impact machines mainly simulate instantaneous positive-wave shock waves. However, in fact, the equipment on underwater ships will have the characteristics of double-wave impact with positive waves and negative waves when subjected to non-contact explosions. Therefore, navies of various countries have proposed double-wave impact standards to replace the traditional single-wave impact simulation.

[0003] At present, the control systems and methods capable of realizing the double-wave function in the existing technologies all have defects. For example, using the hydraulic form to generate a negative-wave curve, due to the characteristics of the hydraulic medium, it is very difficult to adjust the negative-wave parameters. The control and energy storage of the hydraulic pressure are relatively long, resulting in an extended operation time for each impact. At the same time, it is very difficult to meet the technical requirement indicators in the existing military standards. Summary of the Invention

[0004] An embodiment of the present invention provides a double-wave impact machine. The double-wave impact machine generates a negative-wave impact through impact gas. The impact gas can quickly reach the required air pressure for impact, accelerating the energy storage speed for each impact and avoiding the problem of long energy storage time caused by using hydraulic impact. In addition, by controlling the air pressure of the impact gas, the waveform of the negative-wave impact can be relatively simply controlled, so that the acceleration and pulse width of each negative-wave impact can be accurately controlled, realizing more accurate impact simulation, and thus obtaining more definite and accurate impact data.

[0005] In a first aspect, an embodiment of the present invention provides a double-wave impact machine, including a first impact module, a second impact module, a control module, and a data acquisition module;

[0006] The control module is configured to send a first impact signal to the first impact module and a second impact signal to the second impact module;

[0007] The first impact module is configured to output impact gas to a to-be-tested object after receiving the first impact signal to perform a negative-wave impact;

[0008] The second impact module is configured to output a positive-wave impact to the to-be-tested object after receiving the second impact signal;

[0009] The data acquisition module is communicatively connected to the control module, and is configured to collect impact data of the to-be-tested object and send the impact data to the control module; the control module is further configured to determine an impact spectrum line according to the impact data.

[0010] Optionally, the dual-wave impact machine further includes an air pump, a first pneumatic valve, and a first air pressure sensor. The air pump is connected to the first impact module through the first pneumatic valve;

[0011] The control module is communicatively connected to the first pneumatic valve and is configured to send a first inflation signal to the first pneumatic valve to control the air pump to pump impact gas into the first impact module after being connected to the first impact module;

[0012] The first air pressure sensor is communicatively connected to the control module and is configured to detect the air pressure of the first impact module and send a first stop signal to the control module when the air pressure of the first impact module is greater than or equal to a first preset air pressure;

[0013] The control module is further configured to send a first closing signal to the first pneumatic valve after receiving the first stop signal to control the first pneumatic valve to close.

[0014] Optionally, the second impact module includes an energy storage chamber, an impact chamber, and a gas blocking module. The gas blocking module is disposed on the communication path between the energy storage chamber and the impact chamber; the impact chamber includes an impact hammer;

[0015] The energy storage chamber is configured to store impact gas;

[0016] The gas blocking module is configured to open after receiving a second impact signal, communicate the energy storage chamber and the impact chamber, so that the impact gas pushes the impact hammer to perform a positive wave impact on the object to be measured.

[0017] Optionally, the dual-wave impact machine further includes an air pump, a second pneumatic valve, and a second air pressure sensor. The air pump is connected to the energy storage chamber through the second pneumatic valve;

[0018] The control module is communicatively connected to the second pneumatic valve and is configured to send a second inflation signal to the second pneumatic valve to control the air pump to pump impact gas into the energy storage chamber after being connected to the energy storage chamber;

[0019] The second air pressure sensor is communicatively connected to the control module and is configured to detect the air pressure of the energy storage chamber and send a second stop signal to the control module when the air pressure of the energy storage chamber is greater than or equal to a second preset air pressure;

[0020] The control module is further configured to send a second closing signal to the second pneumatic valve after receiving the second stop signal to control the second pneumatic valve to close.

[0021] Optionally, the gas blocking module includes a thimble and a thimble chamber;

[0022] The thimble is located at the communication point between the energy storage chamber and the impact chamber;

[0023] The thimble chamber is configured to store gas. When the air pressure in the thimble chamber is greater than a third preset air pressure, the thimble is pushed up and the energy storage chamber and the impact chamber are separated;

[0024] The thimble cavity is also used to open when receiving the second impact signal, discharge the gas in the thimble cavity, and make the air pressure in the thimble cavity less than or equal to the third preset air pressure.

[0025] Optionally, the dual-wave impact machine further includes an air pump, a third pneumatic valve, and a third air pressure sensor. The air pump is communicated with the thimble cavity through the third pneumatic valve;

[0026] The control module is communicatively connected to the third pneumatic valve and is used to send a third inflation signal to the third pneumatic valve to control the air pump to pump impact gas into the thimble cavity after being communicated with the thimble cavity;

[0027] The third air pressure sensor is communicatively connected to the control module and is used to detect the air pressure in the thimble cavity, and send a third stop signal to the control module when the air pressure in the thimble cavity is greater than the third preset air pressure;

[0028] The control module is further used to send a third closing signal to the third pneumatic valve after receiving the third stop signal to control the third pneumatic valve to close.

[0029] Optionally, the dual-wave impact machine further includes an air pump, a fourth pneumatic valve, and a braking module. The braking module includes a braking cavity and a brake rod. The air pump is communicated with the braking cavity through the fourth pneumatic valve;

[0030] The data acquisition module is further used to send a braking signal to the control module after acquiring the positive-wave impact data;

[0031] The control module is further used to send a braking signal to the fourth pneumatic valve after receiving the braking signal to control the gas to enter the braking cavity to push the brake rod to stop the movement of the impact hammer.

[0032] Optionally, the data acquisition module includes an accelerometer;

[0033] The accelerometer is used to measure the acceleration data of the object to be measured, and the impact data includes the acceleration data.

[0034] In a second aspect, an embodiment of the present invention provides a control method for a dual-wave impact machine, which is applicable to the dual-wave impact machine provided in any embodiment of the present invention. The control method includes:

[0035] Sending a second impact signal to the second impact module to enable the second impact module to output a positive-wave impact to the object to be measured according to the second impact signal;

[0036] Sending a first impact signal to the first impact module to enable the first impact module to output impact gas to the object to be measured according to the first impact signal for negative-wave impact;

[0037] Controlling the data acquisition module to acquire the impact data of the object to be measured and determining the impact spectrum line according to the impact data.

[0038] Optionally, the dual-wave impact machine further includes an air pump, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a first air pressure sensor, a second air pressure sensor, a third air pressure sensor, a fourth air pressure sensor, and a braking module. The braking module includes a braking chamber and a braking rod;

[0039] The second impact module includes an energy storage chamber, an impact chamber, and a gas blocking module. The gas blocking module is disposed on the communication path between the energy storage chamber and the impact chamber; the impact chamber includes an impact hammer; the gas blocking module includes a thimble and a thimble chamber, and the thimble is located at the communication part of the energy storage chamber and the impact chamber;

[0040] The air pump is connected to the first impact module through the first pneumatic valve, connected to the energy storage chamber through the second pneumatic valve, connected to the thimble chamber through the third pneumatic valve, and connected to the braking chamber through the fourth pneumatic valve;

[0041] Before sending a second impact signal to the second impact module, it further includes:

[0042] Sending a third inflation signal to the third pneumatic valve to control the air pump to be connected to the thimble chamber and then pump impact gas into the thimble chamber; and receiving the air pressure of the thimble chamber fed back by the third air pressure sensor, and when the air pressure of the thimble chamber is greater than the third preset air pressure, sending a third closing signal to the third pneumatic valve to control the third pneumatic valve to close;

[0043] Sending a first inflation signal to the first pneumatic valve to control the air pump to be connected to the first impact module and then pump impact gas into the first impact module; and receiving the air pressure of the first impact module fed back by the first air pressure sensor, and when the air pressure of the first impact module is greater than the first preset air pressure, sending a first closing signal to the first pneumatic valve to control the first pneumatic valve to close;

[0044] Sending a second inflation signal to the second pneumatic valve to control the air pump to be connected to the energy storage chamber and then pump impact gas into the energy storage chamber; and receiving the air pressure of the energy storage chamber fed back by the second air pressure sensor, and when the air pressure of the energy storage chamber is greater than the second preset air pressure, sending a second closing signal to the second pneumatic valve to control the second pneumatic valve to close;

[0045] After controlling the data acquisition module to collect the impact data of the object to be measured, it further includes:

[0046] Sending a braking signal to the fourth pneumatic valve to control the gas to enter the braking chamber to push the braking rod to stop the movement of the impact hammer.

[0047] The double-wave impact machine provided by the embodiments of the present invention generates a negative-wave impact through impact gas. The impact gas can quickly reach the required air pressure for impact, accelerating the energy storage speed of each impact and avoiding the problem of long energy storage time caused by using hydraulic impact. In addition, by controlling the air pressure of the impact gas, the waveform of the negative-wave impact can be relatively simply controlled, so that the acceleration and pulse width of each negative-wave impact can be accurately controlled, realizing more accurate impact simulation, and thus obtaining clearer and more accurate impact data.

[0048] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0050] Figure 1 is a structural block diagram of a double-wave impact machine provided by the embodiments of the present invention;

[0051] Figure 2 is a curve graph showing the change of acceleration with time after the object to be measured is impacted;

[0052] Figure 3 is a curve graph showing the relationship between the speed and frequency after the object to be measured is impacted;

[0053] Figure 4 is another curve graph showing the change of acceleration with time after the object to be measured is impacted;

[0054] Figure 5 is yet another curve graph showing the change of acceleration with time after the object to be measured is impacted;

[0055] Figure 6 is another curve graph showing the relationship between the speed and frequency after the object to be measured is impacted;

[0056] Figure 7 is a structural block diagram of another double-wave impact machine provided by the embodiments of the present invention;

[0057] Figure 8 is a structural block diagram of yet another double-wave impact machine provided by the embodiments of the present invention;

[0058] Figure 9 is a structural block diagram of yet another double-wave impact machine provided by the embodiments of the present invention;

[0059] Figure 10 It is a structural block diagram of another double-wave impact machine provided by an embodiment of the present invention;

[0060] Figure 11 It is a structural block diagram of another double-wave impact machine provided by an embodiment of the present invention;

[0061] Figure 12 It is a structural block diagram of another double-wave impact machine provided by an embodiment of the present invention;

[0062] Figure 13 It is a flowchart of a control method provided by an embodiment of the present invention;

[0063] Figure 14 It is a flowchart of another control method provided by an embodiment of the present invention;

[0064] Figure 15 It is a flowchart of another control method provided by an embodiment of the present invention. Detailed implementation manners

[0065] In order to enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all 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.

[0066] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0067] An embodiment of the present invention provides a double-wave impact machine, Figure 1 It is a structural block diagram of a double-wave impact machine provided by an embodiment of the present invention. Refer to Figure 1, the dual-wave impact machine includes a first impact module 100, a second impact module 200, a control module 300, and a data acquisition module 400; the control module 300 is configured to send a first impact signal to the first impact module 100 and a second impact signal to the second impact module 200; the first impact module 100 is configured to output impact gas to the object under test 500 after receiving the first impact signal to perform a negative-wave impact; the second impact module 200 is configured to output a positive-wave impact to the object under test 500 after receiving the second impact signal; the data acquisition module 400 is communicatively connected to the control module 300, configured to collect the impact data received by the object under test and send the impact data to the control module 300; the control module 300 is further configured to determine the impact spectrum line according to the impact data.

[0068] Figure 2 is a curve graph showing the change of acceleration with time after the object under test is impacted, Figure 3 is a curve graph showing the relationship between velocity and frequency after the object under test is impacted, Figure 4 is another curve graph showing the change of acceleration with time after the object under test is impacted, Figure 5 is yet another curve graph showing the change of acceleration with time after the object under test is impacted, Figure 6 is another curve graph showing the relationship between velocity and frequency after the object under test is impacted, for reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , when the dual-wave impact machine starts to perform an impact, the control module 300 first controls the second impact module 200 to start. The second impact module 200 can output a positive-wave impact to the object under test 500. Subsequently, the control module 300 controls the first impact module 100 to start. The first impact module 100 outputs a negative-wave impact to the object under test 500 by jetting impact gas. By adjusting the air pressure of the impact gas, the acceleration of the object under test 500 after being impacted by the negative wave and the pulse width of the negative-wave impact can be controlled. The greater the air pressure of the impact gas, the greater the acceleration of the object under test 500 after being impacted by the negative wave, and the wider the pulse width of the negative-wave impact. When the object under test 500 is impacted by the positive wave and the negative wave, the acceleration and velocity change. The data acquisition module 400 can collect the acceleration and velocity data of the object under test 500.

[0069] The control module 300 analyzes the acceleration and velocity data and can obtain Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 the curve graphs shown. Figure 2 , Figure 4 and Figure 5The abscissa therein is time, and the ordinate is the acceleration of the object 500 to be measured. The positive wave part is the acceleration change caused by the positive wave impact, and the negative wave part is the acceleration change caused by the negative wave impact. It can be seen that the object 500 to be measured first receives a positive wave impact and generates an acceleration greater than 0, and then receives a negative wave impact in the other direction, and the acceleration of the object 500 to be measured decreases accordingly and becomes negative. After the positive wave impact and the negative wave impact end, the acceleration of the object 500 to be measured gradually approaches 0. The control module 300 can convert Figure 2 the time-domain curve therein into Figure 3 and Figure 6 the frequency-domain curves therein. Figure 3 and Figure 6 In Figure 3 , the abscissa is the frequency of the object 500 to be measured, and the ordinate is the velocity of the object 500 to be measured. In Figure 6 , the four curves represent the impacts in different situations. In , the passband difference represents the range where the frequency-domain curve of the object 500 to be measured appears.

[0070] The double-wave impact machine provided by the embodiment of the present invention generates a negative wave impact by impacting gas. The impacting gas can quickly reach the required air pressure for impact, accelerating the energy storage speed of each impact and avoiding the problem of long energy storage time caused by using hydraulic impact. In addition, by controlling the air pressure of the impacting gas, the waveform of the negative wave impact can be relatively simply controlled, so that the acceleration and pulse width of each negative wave impact can be accurately controlled, realizing more accurate impact simulation, and thus obtaining clearer and more accurate impact data.

[0071] Figure 7 is the structural block diagram of another double-wave impact machine provided by the embodiment of the present invention. Referring to Figure 7 , the double-wave impact machine further includes an air pump 600, a first pneumatic valve 101, and a first air pressure sensor 102. The air pump 600 is connected to the first impact module 100 through the first pneumatic valve 101; the control module 300 is communicatively connected to the first pneumatic valve 101 and is used to send a first inflation signal to the first pneumatic valve 101 to control the air pump 600 to pump the impacting gas into the first impact module 100 after being connected to the first impact module 100; the first air pressure sensor 102 is communicatively connected to the control module 300 and is used to detect the air pressure of the first impact module 100 and send a first stop signal to the control module 300 when the air pressure of the first impact module 100 is greater than or equal to the first preset air pressure; the control module 300 is further used to send a first closing signal to the first pneumatic valve 101 after receiving the first stop signal to control the first pneumatic valve 101 to close.

[0072] Referring to Figure 7 ​​, when the first impact module 100 needs to be inflated, the control module 300 controls the first pneumatic valve 101 to open, so that the air pump 600 is connected to the first impact module 100. The first impact module 100 includes a negative wave cavity, and the air pump 600 pumps impact gas into the negative wave cavity. The first preset air pressure is an air pressure value used to determine whether the air pressure of the impact gas in the first impact module 100 is large enough. When the first air pressure sensor 102 detects that the air pressure of the first impact module 100 is greater than or equal to the first preset air pressure, the control module 300 controls the first pneumatic valve 101 to close, disconnects the air pump 600 from the first impact module 100, and the air pump 600 stops inflating the first impact module 100, so as to ensure that the air pressure in the first impact module 100 is maintained within a predetermined range.

[0073] Figure 8 is a structural block diagram of another double-wave impact machine provided by an embodiment of the present invention. Refer to Figure 8 , the second impact module 200 includes an energy storage cavity 201, an impact cavity 202, and a gas blocking module 203. The gas blocking module 203 is disposed on the communication path between the energy storage cavity 201 and the impact cavity 202; the impact cavity 202 includes an impact hammer 204; the energy storage cavity 201 is used to store impact gas; the gas blocking module 203 is used to open after receiving a second impact signal, connect the energy storage cavity 201 and the impact cavity 202, so that the impact gas pushes the impact hammer 204 to perform a positive wave impact on the object under test 500.

[0074] Refer to Figure 8 , when performing a positive wave impact, the control module 300 controls the gas blocking module 203 to open, connects the energy storage cavity 201 and the impact cavity 202, the impact gas in the energy storage cavity 201 enters the impact cavity 202, pushes the impact hammer 204, the speed of the impact hammer 204 increases, so that the impact hammer 204 performs a positive wave impact on the object under test 500 to simulate the positive wave impact when the object under test 500 is attacked by an explosion. Before the impact, the energy storage cavity 201 stores impact gas, which can shorten the preparation time for the double-wave impact machine to output a positive wave impact. Optionally, the double-wave impact machine further includes an impact transmitter. The impact hammer 204 directly performs a positive wave impact on the impact transmitter, and the impact transmitter can transmit the positive wave impact to the object under test 500, so as to avoid the object under test 500 being directly contacted by the impact hammer 204 and being damaged by collision.

[0075] Optionally, the double-wave impact machine further includes a position detection module. The position detection module is used to detect the position of the impact hammer. Before inflating the energy storage cavity, the position detection module detects the position of the impact hammer. If the impact hammer is in the initial position, the control module controls the air pump to start inflating the energy storage cavity. If the impact hammer is not in the initial position, the impact hammer is first moved to the initial position, and then the inflation starts. The initial position is the position where the impact hammer should be when it is ready to perform an impact.

[0076] Figure 9 is a structural block diagram of another double-wave impact machine provided by an embodiment of the present invention. Refer to Figure 9 , the double-wave impact machine further includes an air pump 600, a second pneumatic valve 205, and a second air pressure sensor 206. The air pump 600 is communicated with the energy storage chamber 201 through the second pneumatic valve 205; the control module 300 is communicatively connected with the second pneumatic valve 205, and is configured to send a second inflation signal to the second pneumatic valve 205 to control the air pump 600 to be communicated with the energy storage chamber 201 and then pump impact gas into the energy storage chamber 201; the second air pressure sensor 206 is communicatively connected with the control module 300, and is configured to detect the air pressure in the energy storage chamber 201, and when the air pressure in the energy storage chamber 201 is greater than or equal to a second preset air pressure, send a second stop signal to the control module 300; the control module 300 is further configured to send a second closing signal to the second pneumatic valve 205 after receiving the second stop signal to control the second pneumatic valve 205 to close.

[0077] Refer to Figure 9 , when the second impact module 200 needs to be inflated, the control module 300 controls the second pneumatic valve 205 to open, so that the air pump 600 is communicated with the second impact module 200, and the air pump 600 pumps impact gas into the second impact module 200. The second preset air pressure is an air pressure value used to determine whether the impact gas pressure in the second impact module 200 is large enough. When the second air pressure sensor 206 detects that the air pressure in the second impact module 200 is greater than or equal to the second preset air pressure, the control module 300 controls the second pneumatic valve 205 to close, so that the air pump 600 is disconnected from the second impact module 200, and the air pump 600 stops inflating the second impact module 200, thereby ensuring that the air pressure in the second impact module 200 is maintained within a predetermined range.

[0078] Figure 10 is a structural block diagram of another double-wave impact machine provided by an embodiment of the present invention. Refer to Figure 10 , the gas blocking module 203 includes a thimble 207 and a thimble chamber 208; the thimble 207 is located at the communication part between the energy storage chamber 201 and the impact chamber 202; the thimble chamber 208 is used for storing gas. When the air pressure in the thimble chamber 208 is greater than a third preset air pressure, the thimble 207 is lifted, and the energy storage chamber 201 and the impact chamber 202 are separated; the thimble chamber 208 is further used for opening when receiving a second impact signal, discharging the gas in the thimble chamber 208, so that the air pressure in the thimble chamber 208 is less than or equal to the third preset air pressure.

[0079] Refer to Figure 10, the third preset air pressure is the air pressure value used to determine whether the ejector pin 207 is lifted. When the double-wave impact machine is about to perform a positive-wave impact, the air pump 600 pumps gas into the ejector pin cavity 208, so that the air pressure in the ejector pin cavity 208 is greater than the third preset air pressure, and the ejector pin 207 is lifted. The lifted ejector pin 207 blocks the connection between the energy storage cavity 201 and the impact cavity 202. At this time, the impact gas in the energy storage cavity 201 will not enter the impact cavity 202. When the double-wave impact machine determines to perform a positive-wave impact, the control module 300 controls the ejector pin cavity 208 to exhaust air. When the air pressure in the ejector pin cavity 208 is less than or equal to the third preset air pressure, the ejector pin 207 drops, the energy storage cavity 201 and the impact cavity 202 are connected, and the impact gas accumulated in the energy storage cavity 201 enters the impact cavity 202, pushing the impact hammer 204 to perform a positive-wave impact. By controlling the ejector pin 207, the air pressure in the energy storage cavity 201 can be controlled, thereby controlling the intensity of the positive-wave impact.

[0080] Figure 11 is a structural block diagram of another double-wave impact machine provided by an embodiment of the present invention. Refer to Figure 11 , the double-wave impact machine further includes an air pump 600, a third pneumatic valve 209, and a third air pressure sensor 210. The air pump 600 is connected to the ejector pin cavity 208 through the third pneumatic valve 209; the control module 300 is communicatively connected to the third pneumatic valve 209 and is used to send a third inflation signal to the third pneumatic valve 209 to control the air pump 600 to pump impact gas into the ejector pin cavity 208 after being connected to the ejector pin cavity 208; the third air pressure sensor 210 is communicatively connected to the control module 300 and is used to detect the air pressure in the ejector pin cavity 208 and send a third stop signal to the control module 300 when the air pressure in the ejector pin cavity 208 is greater than the third preset air pressure; the control module 300 is further used to send a third closing signal to the third pneumatic valve 209 after receiving the third stop signal to control the third pneumatic valve 209 to close.

[0081] Refer to Figure 11 , when the double-wave impact machine is about to perform a positive-wave impact, the control module 300 controls the third pneumatic valve 209 to open, so that the air pump 600 is connected to the ejector pin cavity 208, and the air pump 600 pumps impact gas into the ejector pin cavity 208. When the third air pressure sensor 210 detects that the air pressure in the ejector pin cavity 208 is greater than the third preset air pressure, the control module 300 controls the third pneumatic valve 209 to close, so that the air pump 600 is disconnected from the ejector pin cavity 208, and the air pump 600 stops inflating the ejector pin cavity 208, thereby ensuring that the air pressure in the ejector pin cavity 208 is maintained within a predetermined range.

[0082] Figure 12 is a structural block diagram of another double-wave impact machine provided by an embodiment of the present invention. Refer to Figure 12, the double-wave impact machine further includes an air pump 600, a fourth pneumatic valve, and a braking module. The braking module includes a braking chamber and a braking rod. The air pump 600 is communicated with the braking chamber through the fourth pneumatic valve; the data acquisition module 400 is further configured to send a braking signal to the control module 300 after collecting the positive-wave impact data; the control module 300 is further configured to send a braking signal to the fourth pneumatic valve after receiving the braking signal to control the gas to enter the braking chamber to push the braking rod so as to stop the movement of the impact hammer 204.

[0083] Reference Figure 12 , after the impact hammer 204 outputs a positive-wave impact on the object to be measured 500, the control module 300 controls the fourth pneumatic valve to open, so that the gas enters the braking chamber to push the braking rod. The braking rod can brake the impact hammer 204 to avoid the impact hammer 204 from performing a secondary rebound impact on the object to be measured 500 and the data acquisition module 400 from collecting redundant data. The braking rod can brake the impact hammer 204 after the data acquisition module 400 collects the positive-wave impact data, or can be set to brake the impact hammer 204 after a fixed time after the start of the positive-wave impact.

[0084] Optionally, the data acquisition module includes an accelerometer; the accelerometer is used to measure the acceleration data of the object to be measured, and the impact data includes the acceleration data. The accelerometer is fixed on the surface of the object to be measured. The accelerometer can measure the acceleration of the object to be measured after being impacted, and the control module can determine the time-domain curve of the acceleration and the frequency-domain curve of the velocity according to the acceleration data.

[0085] Based on the same inventive concept, an embodiment of the present invention provides a control method for a double-wave impact machine, which is applicable to the double-wave impact machine provided in any embodiment of the present invention. Figure 13 is a flowchart of a control method provided by an embodiment of the present invention. Reference Figure 13 , the control method includes:

[0086] S101. Send a second impact signal to the second impact module, so that the second impact module outputs a positive-wave impact on the object to be measured according to the second impact signal.

[0087] Specifically, when the object to be measured is subjected to an explosion impact, it first receives a positive-wave impact and then a negative-wave impact. Therefore, the control module first sends a second impact signal to the second impact module, so that the second impact module outputs a positive-wave impact on the object to be measured according to the second impact signal, and then sends a first impact signal to the first impact module, so that the first impact module outputs impact gas to the object to be measured according to the first impact signal to perform a negative-wave impact.

[0088] S102. Send a first impact signal to the first impact module, so that the first impact module outputs impact gas to the object to be measured according to the first impact signal to perform a negative-wave impact.

[0089] Specifically, the first impact module outputs a negative wave impact to the object to be measured by injecting impact gas. By adjusting the air pressure of the impact gas, the acceleration of the object to be measured after being subjected to the negative wave impact and the pulse width of the negative wave impact can be controlled. The greater the air pressure of the impact gas, the greater the acceleration of the object to be measured after being subjected to the negative wave impact, and the wider the pulse width of the negative wave impact.

[0090] S103. Control the data acquisition module to collect the impact data of the object to be measured, and determine the impact spectrum line according to the impact data.

[0091] Specifically, the control module can determine the change of the acceleration of the object to be measured with time according to the impact data, so as to obtain the change of the velocity of the object to be measured and the velocity frequency domain curve of the object to be measured.

[0092] In the control method provided by the embodiment of the present invention, a negative wave impact is generated by impact gas. The impact gas can quickly reach the required air pressure within the second impact pulse width, accelerating the energy storage speed of each impact and avoiding the problem of long energy storage time caused by using hydraulic impact.

[0093] Optionally, the double-wave impact machine further includes an air pump, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a first air pressure sensor, a second air pressure sensor, a third air pressure sensor, a fourth air pressure sensor and a braking module. The braking module includes a braking cavity and a braking rod; the second impact module includes an energy storage cavity, an impact cavity and a gas blocking module. The gas blocking module is arranged on the communication path between the energy storage cavity and the impact cavity; the impact cavity includes an impact hammer; the gas blocking module includes a thimble and a thimble cavity, and the thimble is located at the communication place of the energy storage cavity and the impact cavity; the air pump is communicated with the first impact module through the first pneumatic valve, communicated with the energy storage cavity through the second pneumatic valve, communicated with the thimble cavity through the third pneumatic valve, and communicated with the braking cavity through the fourth pneumatic valve.

[0094] Figure 14 is a flowchart of another control method provided by the embodiment of the present invention. The control method provided by the embodiment of the present invention further describes how to control the air pump to inflate the thimble cavity, the first impact module and the second impact module on the basis of the previous embodiment. Refer to Figure 14 , the control method includes:

[0095] S201. Send a third inflation signal to the third pneumatic valve to control the air pump to pump the impact gas into the thimble cavity after being communicated with the thimble cavity; and receive the air pressure of the thimble cavity fed back by the third air pressure sensor, and when the air pressure of the thimble cavity is greater than the third preset air pressure, send a third closing signal to the third pneumatic valve to control the third pneumatic valve to close.

[0096] Specifically, when the double-wave impact machine is ready for impact, the connection between the energy storage chamber and the impact chamber should be cut off first, so that the energy storage chamber can accumulate enough impact gas to push the impact hammer. When the air pressure in the thimble chamber is greater than the third preset air pressure, the thimble is pushed up, so that the thimble can block the connection between the energy storage chamber and the impact chamber.

[0097] S202. Send a first inflation signal to the first pneumatic valve to control the air pump to communicate with the first impact module, and then pump the impact gas into the first impact module; and receive the air pressure of the first impact module fed back by the first pressure sensor, and when the air pressure of the first impact module is greater than the first preset air pressure, send a first closing signal to the first pneumatic valve to control the first pneumatic valve to close.

[0098] Specifically, the impact gas in the first impact module is used to perform a negative-wave impact on the object to be measured. Therefore, the air pressure in the first impact module needs to be large enough to achieve the negative-wave impact.

[0099] S203. Send a second inflation signal to the second pneumatic valve to control the air pump to communicate with the energy storage chamber, and then pump the impact gas into the energy storage chamber; and receive the air pressure of the energy storage chamber fed back by the second pressure sensor, and when the air pressure of the energy storage chamber is greater than the second preset air pressure, send a second closing signal to the second pneumatic valve to control the second pneumatic valve to close.

[0100] Specifically, after cutting off the connection between the energy storage chamber and the impact chamber, the impact gas in the energy storage chamber will not leak into the impact chamber. At this time, the impact gas can be pumped into the energy storage chamber to make the air pressure in the energy storage chamber greater than the first preset air pressure. It can be understood that there is no fixed sequence between the step of sending the first inflation signal to the first pneumatic valve and the step of sending the second inflation signal to the second pneumatic valve. S202 and S203 can be carried out simultaneously or sequentially.

[0101] S204. Send a second impact signal to the second impact module, so that the second impact module outputs a positive-wave impact to the object to be measured according to the second impact signal.

[0102] S205. Send a first impact signal to the first impact module, so that the first impact module outputs impact gas to the object to be measured according to the first impact signal to perform a negative-wave impact.

[0103] S206. Control the data acquisition module to collect the impact data of the object to be measured, and determine the impact spectrum line according to the impact data.

[0104] The control method provided by the embodiment of the present invention enables the first impact module and the second impact module to store enough impact gas to achieve positive-wave impact and negative-wave impact. At the same time, the thimble enables the second impact module to store the impact gas in the energy storage chamber, so that the impact hammer can obtain a large enough acceleration during the positive-wave impact.

[0105] Figure 15 It is a flowchart of another control method provided by an embodiment of the present invention. Based on the previous embodiment, the control method provided by the embodiment of the present invention further explains how to brake the impact hammer. Refer to Figure 15 , the control method includes:

[0106] S301. Send a third inflation signal to the third pneumatic valve to control the air pump to communicate with the thimble cavity, and then pump the impact gas into the thimble cavity; and receive the air pressure of the thimble cavity feedback by the third pressure sensor, and when the air pressure of the thimble cavity is greater than the third preset air pressure, send a third closing signal to the third pneumatic valve to control the third pneumatic valve to close.

[0107] S302. Send a first inflation signal to the first pneumatic valve to control the air pump to communicate with the first impact module, and then pump the impact gas into the first impact module; and receive the air pressure of the first impact module feedback by the first pressure sensor, and when the air pressure of the first impact module is greater than the first preset air pressure, send a first closing signal to the first pneumatic valve to control the first pneumatic valve to close.

[0108] S303. Send a second inflation signal to the second pneumatic valve to control the air pump to communicate with the energy storage cavity, and then pump the impact gas into the energy storage cavity; and receive the air pressure of the energy storage cavity feedback by the second pressure sensor, and when the air pressure of the energy storage cavity is greater than the second preset air pressure, send a second closing signal to the second pneumatic valve to control the second pneumatic valve to close.

[0109] S304. Send a second impact signal to the second impact module to make the second impact module output a positive wave impact to the object to be measured according to the second impact signal.

[0110] S305. Send a first impact signal to the first impact module to make the first impact module output impact gas to the object to be measured for negative wave impact according to the first impact signal.

[0111] S306. Control the data acquisition module to collect the impact data of the object to be measured and determine the impact spectrum line according to the impact data.

[0112] S307. Send a braking signal to the fourth pneumatic valve to control the gas to enter the braking cavity to push the braking rod to stop the movement of the impact hammer.

[0113] Specifically, after the data acquisition module collects the impact data of the object to be measured, it indicates that the impact hammer has performed a positive wave impact on the object to be measured. The control module sends a braking signal to the fourth pneumatic valve, the air pump pumps the gas into the braking cavity, the gas pushes the braking rod, and the braking rod can squeeze the impact hammer, thereby braking the impact hammer and avoiding the impact hammer from rebounding and performing a secondary impact on the object to be measured.

[0114] The control method provided by the embodiment of the present invention can brake the impact hammer after the impact hammer completes the positive wave impact, avoiding the secondary impact on the object to be measured after the impact hammer rebounds, avoiding the loss of the impact hammer, and also avoiding the collection of redundant data by the data acquisition module.

[0115] The above specific implementation manners do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A double-wave impact machine, characterized in that, It includes a first impact module, a second impact module, a control module, and a data acquisition module; The control module is configured to send a first impact signal to the first impact module and a second impact signal to the second impact module; The first impact module is configured to output impact gas to the object under test after receiving the first impact signal for negative wave impact; The second impact module is configured to output a positive wave impact to the object under test after receiving the second impact signal; The data acquisition module is communicatively connected to the control module, and is configured to collect the impact data received by the object under test and send the impact data to the control module; the control module is further configured to determine the impact spectrum line according to the impact data.

2. The double-wave impact machine according to claim 1, characterized in that, The dual-wave impact machine further includes an air pump, a first pneumatic valve, and a first air pressure sensor. The air pump is connected to the first impact module through the first pneumatic valve; The control module is communicatively connected to the first pneumatic valve and is configured to send a first inflation signal to the first pneumatic valve to control the impact gas to be pumped into the first impact module after the air pump is connected to the first impact module; The first air pressure sensor is communicatively connected to the control module and is configured to detect the air pressure of the first impact module, and send a first stop signal to the control module when the air pressure of the first impact module is greater than or equal to a first preset air pressure; The control module is further configured to send a first closing signal to the first pneumatic valve after receiving the first stop signal to control the first pneumatic valve to close.

3. The double-wave impact machine according to claim 1, characterized in that, The second impact module includes an energy storage chamber, an impact chamber, and a gas blocking module. The gas blocking module is disposed on the communication path between the energy storage chamber and the impact chamber; the impact chamber includes an impact hammer; The energy storage chamber is configured to store the impact gas; The gas blocking module is configured to open after receiving the second impact signal, connect the energy storage chamber and the impact chamber, so that the impact gas pushes the impact hammer to perform a positive wave impact on the object under test.

4. The double-wave impact machine according to claim 3, characterized in that, The dual-wave impact machine further includes an air pump, a second pneumatic valve, and a second air pressure sensor. The air pump is connected to the energy storage chamber through the second pneumatic valve; The control module is communicatively connected to the second pneumatic valve and is configured to send a second inflation signal to the second pneumatic valve to control the impact gas to be pumped into the energy storage chamber after the air pump is connected to the energy storage chamber; The second air pressure sensor is communicatively connected to the control module and is configured to detect the air pressure of the energy storage chamber, and send a second stop signal to the control module when the air pressure of the energy storage chamber is greater than or equal to a second preset air pressure; The control module is further configured to send a second closing signal to the second pneumatic valve after receiving the second stop signal to control the second pneumatic valve to close.

5. The double-wave impact machine according to claim 3, characterized in that, The gas blocking module includes a thimble and a thimble chamber; The thimble is located at the communication between the energy storage chamber and the impact chamber; The thimble chamber is configured to store gas. When the air pressure in the thimble chamber is greater than a third preset air pressure, the thimble is lifted, and the energy storage chamber and the impact chamber are separated; The ejector cavity is also used to open when receiving the second impact signal, discharge the gas in the ejector cavity, and make the air pressure in the ejector cavity less than or equal to the third preset air pressure.

6. The double-wave impact machine according to claim 5, wherein, The double-wave impact machine further includes an air pump, a third pneumatic valve, and a third air pressure sensor. The air pump is communicated with the ejector cavity through the third pneumatic valve; The control module is communicatively connected to the third pneumatic valve and is used to send a third inflation signal to the third pneumatic valve to control the air pump to pump impact gas into the ejector cavity after being communicated with the ejector cavity; The third air pressure sensor is communicatively connected to the control module and is used to detect the air pressure in the ejector cavity and send a third stop signal to the control module when the air pressure in the ejector cavity is greater than the third preset air pressure; The control module is further used to send a third closing signal to the third pneumatic valve after receiving the third stop signal to control the third pneumatic valve to close.

7. The double-wave impact machine according to claim 3, wherein, The double-wave impact machine further includes an air pump, a fourth pneumatic valve, and a braking module. The braking module includes a braking cavity and a brake rod. The air pump is communicated with the braking cavity through the fourth pneumatic valve; The data acquisition module is further used to send a braking signal to the control module after acquiring the positive-wave impact data; The control module is further used to send the braking signal to the fourth pneumatic valve after receiving the braking signal to control the gas to enter the braking cavity to push the brake rod to stop the movement of the impact hammer.

8. The double-wave impact machine according to claim 1, characterized in that, The data acquisition module includes an accelerometer; The accelerometer is used to measure the acceleration data of the object to be measured, and the impact data includes the acceleration data.

9. A control method for a double-wave impact machine, characterized in that, Applicable to the double-wave impact machine according to any one of claims 1-8, the control method includes: Sending a second impact signal to the second impact module to make the second impact module output a positive-wave impact to the object to be measured according to the second impact signal; Sending a first impact signal to the first impact module to make the first impact module output impact gas to the object to be measured according to the first impact signal for negative-wave impact; Controlling the data acquisition module to acquire the impact data of the object to be measured and determining the impact spectrum line according to the impact data.

10. The control method according to claim 9, characterized in that, The double-wave impact machine further includes an air pump, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a first air pressure sensor, a second air pressure sensor, a third air pressure sensor, a fourth air pressure sensor, and a braking module. The braking module includes a braking cavity and a brake rod; The second impact module includes an energy storage cavity, an impact cavity, and a gas blocking module. The gas blocking module is arranged on the communication path between the energy storage cavity and the impact cavity; the impact cavity includes an impact hammer; the gas blocking module includes an ejector and an ejector cavity, and the ejector is located at the communication place between the energy storage cavity and the impact cavity; The air pump is communicated with the first impact module through the first pneumatic valve, communicated with the energy storage cavity through the second pneumatic valve, communicated with the ejector cavity through the third pneumatic valve, and communicated with the braking cavity through the fourth pneumatic valve; Before sending the second impact signal to the second impact module, it further includes: Send a third inflation signal to the third pneumatic valve to control the air pump to communicate with the thimble cavity, and then pump impact gas into the thimble cavity; and receive the air pressure of the thimble cavity fed back by the third pressure sensor, and when the air pressure of the thimble cavity is greater than the third preset air pressure, send a third closing signal to the third pneumatic valve to control the third pneumatic valve to close; Send a first inflation signal to the first pneumatic valve to control the air pump to communicate with the first impact module, and then pump the impact gas into the first impact module; and receive the air pressure of the first impact module fed back by the first pressure sensor, and when the air pressure of the first impact module is greater than the first preset air pressure, send a first closing signal to the first pneumatic valve to control the first pneumatic valve to close; Send a second inflation signal to the second pneumatic valve to control the air pump to communicate with the energy storage cavity, and then pump the impact gas into the energy storage cavity; and receive the air pressure of the energy storage cavity fed back by the second pressure sensor, and when the air pressure of the energy storage cavity is greater than the second preset air pressure, send a second closing signal to the second pneumatic valve to control the second pneumatic valve to close; After controlling the data acquisition module to collect the impact data of the object to be measured, it further includes: Send a braking signal to the fourth pneumatic valve to control the gas to enter the braking cavity to push the braking rod to stop the movement of the impact hammer.

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