Water jet sound acquisition system based on synchronous cycle control and mine clearing method

Abstract

The invention discloses a water jet sound acquisition system based on synchronous cycle control and a mine clearing method. The water jet sound acquisition system comprises a control computer and a data acquisition card, wherein the control computer is provided with a LabVIEW program; an AO interface of the data acquisition card is connected with an optocoupler relay, and a LabVIEW program of the control computer controls the electromagnetic valve to be opened and closed periodically through the data acquisition card and the optocoupler relay; an AI interface of the data acquisition card is connected with a microphone, and the microphone transmits acquired sound to a LabVIEW program of the computer through the data acquisition card; opening and closing of the electromagnetic valve and sound collection of the microphone are carried out synchronously and written into a TDMS file, and if the electromagnetic valve is closed, a sound signal collected by the microphone is 0. Water flow is jetted in a circulating intermittent mode, so that water is saved; on-off control of the electromagnetic valve and sound signal acquisition are strictly and synchronously carried out, the time error between control and acquisition is smaller than 1 millisecond and is far better than the millisecond-level synchronization error of a traditional scheme, and it is ensured that acquired data accurately correspond to actual physical events.

Description

Technical Field

[0001] This invention relates to the field of high-pressure water jet detection and mine clearance technology, and in particular to a water jet sound acquisition system based on synchronous circulation control and its mine clearance method. Background Technology

[0002] High-pressure water jets are widely used in cutting processes, target detection, and other fields, generating specific acoustic signals during their operation. To obtain meaningful acoustic data and reduce irrelevant information, experiments often control a solenoid valve to intermittently eject the high-pressure water jet (pulsating the water flow), synchronously acquiring the acoustic signal at the moment of jet action. This pulsed water jet control reduces the significant noise generated by continuous jetting and avoids water waste caused by prolonged continuous spraying. However, achieving precise synchronization between the solenoid valve opening and closing and sound acquisition faces numerous challenges. If control and acquisition are not synchronized or lack precision, the acquired signal may not correspond to the moment of water jet action, affecting the accuracy of subsequent signal analysis. In existing technologies, some solutions use trigger circuits or software control to synchronize the solenoid valve and data acquisition, but the synchronization accuracy remains limited, with a time error typically on the order of milliseconds between the control signal and the acquisition trigger.

[0003] For example, existing literature reports the use of LabVIEW software combined with a data acquisition card and solid-state relays to drive solenoid valves, achieving a control system for synchronous acquisition of sound signals, with a control time delay of approximately 10 milliseconds. This delay is still insufficient for experiments requiring higher precision. Furthermore, continuing to acquire and record signals while the solenoid valve is closed generates a large amount of invalid data, wasting storage resources and potentially masking valid signals, thus reducing experimental efficiency. Summary of the Invention

[0004] To address the technical problems existing in the background art, this invention proposes a water jet sound acquisition system and mine clearance method based on synchronous cyclic control.

[0005] The present invention proposes a water jet sound acquisition system based on synchronous cyclic control, which includes a control computer with LabVIEW program installed and a data acquisition card connected to the control computer;

[0006] The AO interface of the data acquisition card is connected to an optocoupler relay. The LabVIEW program of the control computer controls the periodic opening and closing of the solenoid valve through the data acquisition card and the optocoupler relay.

[0007] The AI ​​interface of the data acquisition card is connected to a microphone, which transmits the acquired sound to the LabVIEW program on the computer through the data acquisition card.

[0008] The opening and closing of the solenoid valve is synchronized with the sound acquisition of the microphone and written into the TDMS file. If the solenoid valve is closed, the sound signal acquired by the microphone is 0.

[0009] As a further optimization of the present invention, the solenoid valve is connected to a high-pressure water source via a pipeline, and the solenoid valve is connected to a water jet nozzle.

[0010] As a further optimization of the present invention, the microphone is provided in multiple sets, and the multiple sets of microphones are circumferentially distributed on the outside of the water jet nozzle.

[0011] As a further optimization of the present invention, the water jet nozzle and the plurality of microphones are all mounted on a frame, and the angle of each microphone relative to the frame is adjustable.

[0012] As a further optimization of the present invention, it also includes a signal conditioner for amplifying and filtering the information acquired by the microphone, wherein the microphone is connected to the data acquisition card through the signal conditioner.

[0013] A mine clearance method, employing the aforementioned water jet sound acquisition system, includes the following steps:

[0014] S1. Set the control parameters for the periodic opening and closing of the solenoid valve in the LabVIEW control program;

[0015] S2. Start the LabVIEW control program. Output control signals through the AO channel of the data acquisition card at a set cycle to open the solenoid valve. After the set valve opening duration is reached, close the solenoid valve by inverting the logic. Repeat this cycle to achieve the periodic opening and closing of the solenoid valve. Each time the solenoid valve opens, acquire the sound signal output by the microphone through the AI ​​channel of the data acquisition card and write the signal data into a TDMS format file. Multiply the acquired sound signal by zero during the period when the solenoid valve is closed to avoid the generation of invalid data. In this way, water jet discharge and sound signal acquisition are performed synchronously.

[0016] As a further optimization of the present invention, the control parameters in step S1 include valve opening time, valve closing time, and cycle period.

[0017] As a further optimization of the present invention, the LabVIEW control program adopts a while loop structure, and uses a Boolean shift register combined with a logic inversion module to generate periodic switching states, which are completed in two conditional structures respectively:

[0018] Sound signal acquisition and TDMS writing;

[0019] AO control signal output.

[0020] As a further optimization of the present invention, when the sound signal is acquired and written to TDMS, the sound signal is written when the state of the shift register is true, and the sound signal is multiplied by zero when the state of the shift register is false.

[0021] As a further optimization of the present invention, when the AO control signal is output, a 10V output is used to open the solenoid valve when the shift register is in a true state, and a 0V output is used to close the solenoid valve when the shift register is in a false state.

[0022] The proposed water jet sound acquisition system and mine clearance method based on synchronous cyclic control save water: by using a cyclic intermittent water jet, the solenoid valve is opened only during the required time period in the experiment, and the jet stops when the valve is closed, which fundamentally reduces unnecessary water consumption and achieves a significant water-saving effect.

[0023] High synchronization accuracy: The opening and closing control of the solenoid valve and the acquisition of sound signals are strictly synchronized. The time error between control and acquisition is less than 1 millisecond, which is far better than the synchronization error of several milliseconds in traditional solutions, ensuring that the acquired data corresponds accurately to the actual physical events.

[0024] Data refinement: During the intervals when the solenoid valve is closed, invalid signals are either not recorded or replaced with zero values, avoiding the collection and storage of a large amount of irrelevant background noise data. This reduces the size of the data file, improves the signal-to-noise ratio, and facilitates subsequent data processing and analysis.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] Figure 1 This is a diagram of the water jet sound acquisition system of the present invention;

[0027] Figure 2 This is a flowchart of the state loop of the present invention;

[0028] Figure 3 This is a schematic diagram of the LabVIEW logic control of the present invention;

[0029] Figure 4 This is a comparison diagram of the solenoid valve opening / closing signal and the sound acquisition signal in Embodiment 1 of the present invention;

[0030] Figure 5 This is a schematic diagram of the installation structure of the microphone and water jet nozzle of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of Example 2;

[0032] In the diagram: 1. High-pressure water source; 2. Solenoid valve; 3. Water jet nozzle; 4. Microphone; 5. Signal conditioner; 6. Data acquisition card; 7. Control computer; 8. Optocoupler relay; 10. Frame; 11. Turntable. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] like Figure 1 - Figure 5 The water jet sound acquisition system based on synchronous cycle control shown includes a frame 10, on which a water jet nozzle 3 is mounted and a microphone 4 is mounted on the outer periphery of the water jet nozzle 3. The microphone 4 is a CHZ-211 series microphone. The water jet nozzle 3 is connected to a high-pressure water source 1 through a solenoid valve 2. The solenoid valve 2 is a ZC52 series high-pressure solenoid valve. The high-pressure water source 1 is formed by a pump drawing water into a pipeline. The solenoid valve 2 controls the opening and closing of the water jet nozzle 3.

[0035] like Figure 5 The system also includes a movable frame, on which the microphone 4 and the water jet nozzle 3 are mounted. The movable frame is mounted on the mounting frame 10 via a telescopic component, which is an electric cylinder or a pneumatic cylinder in the prior art, thereby facilitating the adjustment of the positions of the microphone 4 and the water jet nozzle 3 according to the actual situation.

[0036] It also includes a control computer 7 with LabVIEW software installed and a data acquisition card 6 connected to the control computer 7 via a data cable. The data acquisition card 6 is an NI-USB-6003.

[0037] The AO (analog output) interface of the data acquisition card 6 is connected to an optocoupler relay 8, which is a BMZ-K1 series relay. The LabVIEW program of the control computer 7 controls the periodic opening and closing of the solenoid valve 2 through the data acquisition card 6 and the optocoupler relay 8. The optocoupler relay 8 is used to amplify the AO control signal and drive the solenoid valve 2 to open and close.

[0038] The AI ​​(analog input) interface of the data acquisition card 6 is connected to a microphone 4 for collecting the sound of water jets impacting the ground. The microphone 4 transmits the collected sound to the LabVIEW program on the control computer via the data acquisition card. Additionally, a signal conditioner 5 is included for amplifying and filtering the information collected by the microphone 4. The microphone 4 is connected to the data acquisition card 6 via the signal conditioner 5.

[0039] The opening and closing of solenoid valve 2 is synchronized with the sound acquisition of microphone 4 and written into the TDMS file. If solenoid valve 2 is closed, the sound signal acquired by microphone 4 is 0.

[0040] The microphone 4 is provided in multiple sets, and the multiple sets of microphones 4 are distributed circumferentially on the outside of the water jet nozzle 3. Preferably, the water jet nozzle 3 and the multiple microphones 4 are all mounted on the frame 10, and the angle of each microphone 4 relative to the frame 10 can be adjusted.

[0041] A mine clearance method, employing the aforementioned water jet sound acquisition system, includes the following steps:

[0042] S1. In the LabVIEW control program, set the control parameters for the periodic opening and closing of solenoid valve 2. The control parameters include the period, which can be 1s, 0.5s, 1.5s, etc. In this embodiment, the period is 1s. The control parameters also include the valve opening time and valve closing time. The sum of the valve opening time and valve closing time is the period. In this embodiment, the valve opening time is 0.5s and the valve closing time is 0.5s. It should be noted that the specific period, valve opening time, and valve closing time can be set by the user according to actual needs.

[0043] The LabVIEW control program can display information such as the status of solenoid valve 2, current cycle, and sound signal waveform.

[0044] S2. Start the LabVIEW control program and output control signals through the AO channel of the data acquisition card 6 at a set cycle to open the solenoid valve 2. After the set opening duration is reached, the solenoid valve 2 is closed by logic inversion. This cycle repeats to realize the periodic opening and closing of the solenoid valve 2. Each time the solenoid valve 2 is opened, the sound signal output by the microphone 4 is acquired through the AI ​​channel of the data acquisition card 6 and the signal data is written into a TDMS format file. During the period when the solenoid valve 2 is closed, the acquired sound signal is multiplied by zero to avoid the generation of invalid data. In this way, water jet discharge and sound signal acquisition are performed synchronously.

[0045] The LabVIEW control program uses a while loop structure, employing a Boolean shift register combined with a logic inversion module to generate periodic switching states, which are implemented in two conditional structures:

[0046] Sound signal acquisition and TDMS writing;

[0047] AO control signal output.

[0048] As a further optimization of the present invention, when the sound signal is acquired and written to TDMS, the sound signal is written when the shift register state is true, and the sound signal is multiplied by zero when the shift register state is false.

[0049] When the AO control signal is output, it outputs 10V to open solenoid valve 2 when the shift register is in a true state, and outputs 0V to close solenoid valve 2 when the shift register is in a false state.

[0050] Synchronization accuracy and effectiveness of this invention: This invention, through a hardware and software collaborative logic architecture, integrates the control signal output of solenoid valve 2 and the sound signal acquisition command into the same cycle, achieving synchronous control within milliseconds. For example... Figure 4 The experimental results show that the time error between the rising edge of the solenoid valve 2 drive signal and the sound signal acquisition is less than 1 millisecond, which is significantly better than the existing trigger-based acquisition method, effectively ensuring a high degree of matching between the sound data and the water flow behavior. Simultaneously, pausing the jet flow and disabling the acquisition and writing operations during valve closure allows the system to save water while effectively eliminating redundant data, improving the signal-to-noise ratio and analysis efficiency.

[0051] Scope of Application: The synchronous cyclic control water jet sound acquisition system and method provided by this invention are suitable for acoustic testing and research scenarios such as high-pressure water jet impact, liquid impact, and cavitation effects. They are also applicable to industrial applications such as high-pressure water cutting monitoring, target response testing, and jet fluid noise acquisition. With its simple structure, high control precision, and expandable functionality, it can also be extended to other systems with high requirements for synchronization of periodic actions and data acquisition, such as jet devices, vibration equipment, and periodic impact signal detection platforms, demonstrating broad application prospects.

[0052] Example 2

[0053] like Figure 6 As shown, the difference between this embodiment and the above embodiment is that, in order to further increase the sound detection accuracy, a turntable 11 is provided on the frame 10, and a microphone 4 is installed on the turntable 11. N microphones 4 (N is an integer greater than or equal to 2) are installed and distributed on the turntable 11. When the solenoid valve 2 is closed, the turntable 11 rotates 360° / 2N. Then, when the solenoid valve 2 is closed in the next cycle, the turntable 11 reverses 360° / 2N. This cycle can achieve sound acquisition at 2N positions, thereby increasing the acquisition accuracy.

[0054] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0055] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water jet sound acquisition system based on synchronous cycle control, characterized in that, The control computer (7) installed with LabVIEW program and the data acquisition card (6) connected with the control computer (7) are included; The AO interface of the data acquisition card (6) is connected with the optocoupler relay (8), and the LabVIEW program of the control computer (7) controls the electromagnetic valve (2) to open and close periodically through the data acquisition card (6) and the optocoupler relay (8); The AI interface of the data acquisition card (6) is connected with the microphone (4) for sound collection, and the microphone (4) transmits the collected sound to the LabVIEW program of the computer through the data acquisition card; The opening and closing of the electromagnetic valve (2) is synchronized with the sound collection of the microphone (4) and written into the TDMS file, and if the electromagnetic valve (2) is closed, the sound signal collected by the microphone (4) is 0.

2. The synchronized cycle control based water jet sound acquisition system and mine clearing method according to claim 1, characterized in that, The electromagnetic valve (2) is connected with the high-pressure water source (1) through the pipeline, and the electromagnetic valve (2) is connected with the water jet nozzle (3).

3. The water jet sound acquisition system based on synchronous cycle control according to claim 2, characterized in that, The microphone (4) is provided in multiple groups, and the multiple groups of microphones (4) are distributed circumferentially outside the water jet nozzle (3).

4. The synchronized cycle control based water jet sound acquisition system of claim 1, wherein, The water jet nozzle (3) and the multiple microphones (4) are all installed on the rack (10), and the angle of each microphone (4) relative to the rack (10) can be adjusted.

5. The synchronized cycle control based water jet sound acquisition system of claim 1, wherein, The signal conditioner (5) for amplifying and filtering the information collected by the microphone (4) is further included, and the microphone (4) is connected with the data acquisition card (6) through the signal conditioner (5).

6. A method of mine clearance, characterised in that, The water jet sound collection system shown in any one of claims 1-5 is adopted, including the following steps: S1, setting the control parameters of the periodic opening and closing of the electromagnetic valve (2) in the LabVIEW control program; S2, starting the LabVIEW control program, outputting the control signal through the AO channel of the data acquisition card (6) to open the electromagnetic valve (2) according to the set period, and closing the electromagnetic valve (2) through logical inversion control after reaching the set valve opening duration, so as to realize the periodic opening and closing of the electromagnetic valve (2); when the electromagnetic valve (2) is opened each time, the sound signal output by the microphone (4) is collected through the AI channel of the data acquisition card (6) and the signal data is written into the TDMS format file, and the collected sound signal is multiplied by zero during the closing of the electromagnetic valve (2), so that the water jet spraying and sound signal collection are synchronized.

7. A method of mine clearance according to claim 6, characterised in that, The control parameters in step S1 include valve opening time, valve closing time and cycle period.

8. A method of mine clearance according to claim 6, characterised in that, The LabVIEW control program adopts a while loop structure, uses a Boolean type shift register combined with a logical inversion module to generate a periodic on-off state, and completes the following two conditions in the structure: Sound signal collection and TDMS writing; AO control signal output.

9. A method of mine clearance according to claim 8, characterised in that, When the sound signal collection and TDMS writing are performed, the signal is written when the shift register state is true, and the sound signal is multiplied by zero when the shift register state is false.

10. A method of mine clearance according to claim 8, characterised in that, When the AO control signal output is performed, 10V is output to open the electromagnetic valve (2) when the shift register state is true, and 0V is output to close the electromagnetic valve (2) when the shift register state is false.

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