A ship noise simulation device used to determine the vibration isolation effect of hydrophones.

Abstract

This invention relates to a vehicle noise simulation device for determining the vibration isolation effect of a hydrophone. The device comprises: a bottom cavity, a support, a housing, a test chamber, a plug, a water outlet valve, a flow velocity sensor, a rear end cover, a telescopic rod, a moving guide rail, a control console, a connecting ring, a motor, a propeller, a water inlet valve, a slider, a front end cover, and a hydrophone under test. A front end cover and a rear end cover are respectively installed at both ends of the housing. A support is fixed to the lower wall of the housing, and a connecting ring is fixed to the support. The test chamber and the bottom cavity are respectively inserted into the inner wall of the connecting ring, forming a sealed chamber. A motor is installed inside the bottom cavity, with its rotating shaft passing through the bottom cavity. A propeller is mounted on the rotating shaft extending outside the bottom cavity. Several holes are opened in the test chamber opposite the motor, and plugs are installed in these holes. A moving guide rail is fixed to the housing above the sealed chamber, and a slider slides within the moving guide rail. One end of the telescopic rod is fixed to the slider, and the other end is equipped with a flow velocity sensor. The hydrophone under test is mounted on one of the plugs.

Description

Technical Field

[0001] This invention belongs to the field of transducer measurement technology, and specifically relates to a vehicle noise simulation device for judging the vibration isolation effect of hydrophones. Background Technology

[0002] Hydrophones, acting as the "eyes and ears" of underwater vehicles, significantly influence the "reaction distance" of underwater vehicles due to their performance in receiving underwater acoustic signals. To achieve a greater effective range, the "signal-to-noise ratio" (SNR) of the hydrophone needs to be maximized. In SNR, "signal" refers to the target signal the hydrophone wants to receive, while "noise" refers to the noise signal hidden within the target signal. The lower the noise level of the hydrophone, the greater its effective range. Generally, the noise signals that significantly affect hydrophones are divided into the vehicle's own noise and current noise during navigation. The former is mainly caused by hull vibration and cavitation noise from the propeller, while the latter is the current noise generated by water flowing over the hydrophone's surface during navigation. Within the commonly used operating frequency band, vibration noise and current noise constitute the majority.

[0003] In order to evaluate the vibration isolation effect of the internal vibration isolation structure of the hydrophone and to determine the impact of water flow noise on the hydrophone's receiving performance, it is necessary to simulate the shell vibration noise and flow noise received by the hydrophone under actual navigation conditions. However, there is currently no relevant equipment to conduct such tests, and the judgment of the internal vibration isolation effect of the hydrophone relies entirely on experience. Therefore, it will affect the accuracy of the hydrophone vibration isolation design process and may greatly increase the cost of modifying the hydrophone scheme later. Summary of the Invention

[0004] In view of this, in order to address the lack of such testing methods, this invention proposes a vessel noise simulation device for judging the vibration isolation effect of hydrophones. It can simulate the shell vibration and flow noise received by the hydrophone during underwater navigation, thereby evaluating the vibration isolation effect of the internal vibration isolation structure of the hydrophone, improving the accuracy of the hydrophone vibration isolation design and reducing the cost of subsequent hydrophone scheme modifications.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This invention discloses a vehicle noise simulation device for determining the vibration isolation effect of a hydrophone. It comprises: a bottom cavity, a support, a housing, a test chamber, a plug, a water outlet valve, a flow velocity sensor, a rear end cover, a telescopic rod, a moving guide rail, a control console, a connecting ring, a motor, a propeller, a water inlet valve, a slider, a front end cover, and a hydrophone under test. A front end cover and a rear end cover are respectively installed at both ends of the housing. A water inlet valve and a water outlet valve are respectively installed on the front end cover and the rear end cover. Water enters the housing through the water inlet valve and exits the housing through the water outlet valve. A support is fixed to the lower wall of the housing, and a connecting ring is fixed to the support. The test chamber and the bottom cavity are respectively inserted into the inner wall of the connecting ring, forming a sealed enclosure. The chamber contains a motor inside its bottom cavity, with the motor's rotating shaft passing through the bottom cavity. A propeller is mounted on the rotating shaft extending out of the bottom cavity. Several holes are drilled in the test chamber opposite the motor, and plugs are installed in these holes. A movable guide rail is fixed on the box above the sealed chamber, and a slider slides within the movable guide rail. One end of a telescopic rod is fixed to the slider, and the other end is equipped with a flow velocity sensor. The flow velocity sensor is close to the plug in the test chamber. When the aircraft noise simulation device used to determine the vibration isolation effect of the hydrophone is working, the hydrophone under test is installed on one of the plugs. The flow velocity sensor and the hydrophone under test are connected to a control console placed outside the box via wiring. The motor is also connected to the control console via wiring.

[0007] The present invention provides a vehicle noise simulation device for judging the vibration isolation effect of a hydrophone, wherein: the movable guide rail is a channel steel, the upper end of the channel steel is welded to the inner side of the upper wall of the box, a slider is installed inside the channel steel, one end of the telescopic rod is fixed to the lower end of the slider through the telescopic rod opening slot, a side slot is opened on one side of the channel steel, and a positioning screw passes through the side slot and the slider to fix the slider inside the channel steel.

[0008] The present invention provides a vehicle noise simulation device for judging the vibration isolation effect of a hydrophone, wherein: an O-ring is installed between the inner wall of the test chamber and the connecting ring, and an O-ring is installed between the bottom chamber and the inner wall of the connecting ring.

[0009] The present invention provides a vehicle noise simulation device for judging the vibration isolation effect of a hydrophone, wherein the wiring passes through a wall socket mounted on the housing and is connected to the control console.

[0010] Compared with the prior art, the aircraft noise simulation device of the present invention for judging the vibration isolation effect of hydrophones can detect the flow noise and propeller self-noise when navigating through a simulated aircraft. It solves the problem that the prior art cannot effectively evaluate the internal vibration isolation structure and vibration isolation material of the transducer, improves the accuracy of hydrophone vibration isolation design and reduces the cost of modifying hydrophone schemes in the later stage. Attached Figure Description

[0011] Figure 1This is a front cross-sectional schematic diagram of the aircraft noise simulation device for judging the vibration isolation effect of hydrophones according to the present invention. For the sake of simplicity, the connection lines between the motor and the control console are not shown in the figure.

[0012] Figure 2 From Figure 1 A lateral view showing the enlarged section at point AA.

[0013] exist Figure 1 and Figure 2 In the diagram, 1 is the bottom cavity; 2 is the bracket; 3 is the housing; 4 is the test chamber; 5 is the plug; 6 is the outlet valve; 7 is the flow sensor; 8 is the rear end cover; 9 is the telescopic rod; 10 is the moving guide rail; 11 is the control console; 12 is the connecting ring; 13 is the motor; 14 is the propeller; 15 is the inlet valve; 16 is the fixing pin; 17 is the slider; 18 is the front end cover; 19 is the through-wall socket; 20 is the sealing ring; 21 is the hydrophone under test; 22 is the side groove; 23 is the telescopic rod opening groove; and 24 is the rotating shaft. Detailed Implementation

[0014] like Figure 1 and Figure 2 As shown, the aircraft noise simulation device for judging the vibration isolation effect of hydrophones of the present invention includes: a bottom cavity 1, a bracket 2, a housing 3, a test chamber 4, a plug 5, a water outlet valve 6, a flow rate sensor 7, a rear end cover 8, a telescopic rod 9, a moving guide rail 10, a control console 11, a connecting ring 12, a motor 13, a propeller 14, a water inlet valve 15, a slider 17, a front end cover 18, and a hydrophone 21 to be tested. The front end cover 18 and the rear end cover 8 are respectively installed at both ends of the housing 3. The water inlet valve 15 and the water outlet valve 6 are respectively installed on the front end cover 18 and the rear end cover 8. Water enters the housing 3 through the water inlet valve 15 and exits the housing 3 through the water outlet valve 6.

[0015] A bracket 2 is fixed to the lower wall of the housing 3, and a connecting ring 12 is fixed to the bracket 2. The test chamber 4 and the bottom cavity 1 are respectively inserted into the inner wall of the connecting ring 12. An O-ring 20 is installed between the inner wall of the test chamber 4 and the inner wall of the connecting ring 12, and an O-ring 20 is installed between the inner wall of the bottom cavity 1 and the inner wall of the connecting ring 12. The test chamber 4 and the bottom cavity 1 form a sealed chamber. A motor 13 is installed in the bottom cavity 1, and the rotating shaft 24 of the motor 13 passes through the bottom cavity 1. A propeller 14 is mounted on the rotating shaft 24 that extends out of the bottom cavity 1. Several holes are opened in the test chamber 4 opposite to the motor 13, and plugs 5 are installed in the holes. A moving guide rail is fixed on the housing 3 above the sealed chamber. 10. The slider 17 slides within the moving guide rail 10. One end of the telescopic rod 9 is fixed to the slider 17, and the other end is equipped with a flow velocity sensor 7. The flow velocity sensor 7 is close to the plug 5 of the test chamber 4. When the aircraft noise simulation device used to judge the vibration isolation effect of the hydrophone is working, the hydrophone to be tested 21 is installed on one of the plugs 5. The flow velocity sensor 7 and the hydrophone to be tested 21 are connected to the control console 11 placed outside the housing 3 through a line. The motor 13 is connected to the control console 11 through a line (for simplicity, the line connecting the motor 13 and the control console 11 is not shown in the figure). The line passes through the wall socket 19 installed on the housing 3 and is connected to the control console 11.

[0016] like Figure 2 As shown, the movable guide rail 10 is a channel steel. The upper end of the channel steel is welded to the inner side of the upper wall of the box 3. A slider 17 is installed inside the channel steel. One end of the telescopic rod 9 is fixed to the lower end of the slider 17 through the telescopic rod opening slot 23. A side slot 22 is opened on one side of the channel steel. The fixing pin 16 passes through the side slot 22 and the slider 17 to fix the slider 17 inside the channel steel.

[0017] The control console 11 contains three modules: a hydrophone signal acquisition module, a flow velocity signal acquisition module, and a motor control module. When the hydrophone under test 21 receives the shell vibration signal and the flow noise signal, the hydrophone under test 21 converts the vibration signal into an electrical signal and transmits it to the signal acquisition module of the control console 11 through the lines. The control console 11 can display the waveform of the transmitted electrical signal in real time and determine the magnitude of the vibration signal received by the hydrophone under test by its peak value. Similarly, when the motor 13 needs to rotate, the motor control module transmits the signal to the motor 13 in the test chamber 4 according to the input information, driving the propeller 14 to rotate.

[0018] See attached document Figure 1One end of the telescopic rod 9 is equipped with a slider 17, and a flow rate sensor 7 is installed at the head of the telescopic rod, so as to satisfy the left and right movement of the flow rate sensor 7; the moving guide rail 10 is a slide rail steel fixed inside the housing 3, and the slider 17 at the bottom of the telescopic rod 9 is placed in the slide rail of the moving guide rail 10. The telescopic rod 9 can extend and retract up and down to satisfy the up and down movement of the flow rate sensor 7. The above structure can place the flow rate sensor in a suitable position in the housing 3 and transmit the water flow rate information to the control console 11 through the line.

[0019] The working process of the aircraft noise simulation device for determining the vibration isolation effect of a hydrophone according to the present invention is as follows:

[0020] Fill the housing 3 with water, keep the inlet valve 15 open and the outlet valve 6 closed, control the speed of the propeller 14 through the motor 13, monitor and record the vibration signal of the housing received by the hydrophone 21 under different propeller speeds.

[0021] Fill the chamber 3 with water, keep the inlet valve 15 open, and control the water flow rate by adjusting the outlet valve 6. Monitor and record the flow noise received by the hydrophone 21 under different flow rates. This allows for the evaluation of the vibration isolation effect inside the hydrophone and the measurement of flow noise under different flow rates.

[0022] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0023] This invention may have other various embodiments. Without departing from the spirit and essence of this invention, those skilled in the art can make various corresponding changes and modifications according to this invention, but these changes and modifications should all fall within the protection scope of the claims of this invention.

Claims

1. A ship noise simulation device for judging the vibration isolation effect of hydrophones, comprising: Bottom cavity (1), bracket (2), housing (3), test chamber (4), plug (5), outlet valve (6), flow sensor (7), rear end cover (8), telescopic rod (9), moving guide rail (10), control console (11), connecting ring (12), motor (13), propeller (14), inlet valve (15), slider (17), front end cover (18), and hydrophone under test (21). The housing (3) is equipped with a front end cover (18) and a rear end cover (21) at both ends. 8) A water inlet valve (15) and a water outlet valve (6) are respectively installed on the front end cover (18) and the rear end cover (8). Water enters the box (3) through the water inlet valve (15) and exits the box (3) through the water outlet valve (6). The characteristic is that a bracket (2) is fixed on the lower wall of the box (3), and a connecting ring (12) is fixed on the bracket (2). The test chamber (4) and the bottom cavity (1) are respectively inserted into the inner wall of the connecting ring (12). The test chamber (4) and the bottom cavity (1) form a sealed chamber. A motor (13) is installed in the bottom cavity (1). The rotating shaft (24) of the motor (13) passes through the bottom cavity (1). The propeller (14) is mounted on the rotating shaft (24) that extends out of the bottom cavity (1). Several holes are opened in the test chamber (4) opposite to the motor (13). Plugs (5) are installed in the holes. A moving guide rail (10) is fixed on the box (3) above the sealed chamber. The slider (17) slides in the moving guide rail (10). One end of the telescopic rod (9) is fixed. On the slider (17), a flow velocity sensor (7) is installed at the other end. The flow velocity sensor (7) is close to the plug (5) of the test chamber (4). When the aircraft noise simulation device used to judge the vibration isolation effect of the hydrophone is working, the hydrophone to be tested (21) is installed on one of the plugs (5). The flow velocity sensor (7) and the hydrophone to be tested (21) are connected to the control console (11) placed outside the box (3) through the line. The motor (13) is connected to the control console (11) through the line.

2. The aircraft noise simulation device for judging the vibration isolation effect of hydrophones as described in claim 1, characterized in that: The movable guide rail (10) is a channel steel. The upper end of the channel steel is welded to the inner side of the upper wall of the box (3). A slider (17) is installed inside the channel steel. One end of the telescopic rod (9) is fixed to the lower end of the slider (17) through the telescopic rod opening slot (23). A side slot (22) is opened on one side of the channel steel. The fixing pin (16) passes through the side slot (22) and the slider (17) to fix the slider (17) inside the channel steel.

3. The aircraft noise simulation device for judging the vibration isolation effect of hydrophones as described in claim 2, characterized in that: An O-ring (20) is installed between the inner wall of the test chamber (4) and the connecting ring (12), and an O-ring (20) is installed between the inner wall of the bottom chamber (1) and the connecting ring (12).

4. The aircraft noise simulation device for judging the vibration isolation effect of hydrophones as described in claim 3, characterized in that: The line passes through a wall socket (19) mounted on the enclosure (3) and is connected to the control panel (11).

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