CN211442712U - Underwater perforated flow excitation noise liquid filling type active control device - Google Patents
Underwater perforated flow excitation noise liquid filling type active control device Download PDFInfo
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- CN211442712U CN211442712U CN201921138722.8U CN201921138722U CN211442712U CN 211442712 U CN211442712 U CN 211442712U CN 201921138722 U CN201921138722 U CN 201921138722U CN 211442712 U CN211442712 U CN 211442712U
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Abstract
The utility model provides an underwater tapping flow excitation noise liquid filling type active control device, which comprises a liquid cavity, a vibration/pulsation force monitoring sensor, a control box and a hydraulic pump/valve; the liquid cavity is embedded and installed on the front edge of the underwater opening, the vibration/pulsation force monitoring sensor is installed on the opening, the control box is connected with the vibration/pulsation force monitoring sensor and the hydraulic pump/valve, the liquid cavity is connected with the hydraulic pump/valve, and the control box controls the hydraulic pump/valve to fill and discharge liquid into the liquid cavity according to the monitoring result of the vibration/pulsation force monitoring sensor. The device can work underwater, has simple structure, easy realization, high reliability, convenient installation and strong environmental adaptability, and can realize the active control of the underwater tapping flow line spectrum noise.
Description
Technical Field
The utility model belongs to the technical field of vibration noise control, concretely relates to flow induced noise active control device under water.
Background
Underwater vehicle aperture models are exposed to the surrounding flow field and generate noise when fluid shear flows past them. The shear flow through the bore not only produces self-sustained oscillations of pressure causing periodic variations in pressure near the opening to produce line spectrum noise, but also results in high dynamic loads and increased line spectrum intensity when the shear flow motion and certain modes of the cavity are coupled. Although the noise of the underwater opening hole can be controlled by adopting the opening and closing device, part of the opening hole is not allowed to be closed due to the safety consideration. The numerical calculation surface is provided with the air guide sleeve on the front edge of the opening, so that the line spectrum of the flow-induced noise generated by the opening can be effectively inhibited, but the high-frequency noise is possibly increased at high navigational speed due to the newly added air guide sleeve device.
The fluid self-sustaining oscillation of the cavity at the opening is the source of the sound generated by the flow of the opening. After the fluid medium flows through the opening, at a certain Reynolds number, shedding vortexes can alternately appear in the wake flow of the opening, and the shedding vortexes can normally prevail over self-sustaining oscillation of pressure, so that noise, namely fluid-dynamic oscillation noise, is generated. Meanwhile, as the self-sustaining oscillation frequency is close to the natural frequency of the structure/cavity, the structure/cavity is excited to vibrate at the natural frequency, and strong line spectrum noise, namely fluid-cavity resonance oscillation and fluid-elastic oscillation noise, can be generated. However, in either case, the excitation source is an unstable shear flow along the opening. Therefore, in order to control the open-hole flow-induced line spectral noise, it is critical to achieve control of the open-hole shear flow.
Numerical calculation results show that the flow guide cover is additionally arranged on the front edge of the opening, so that the impact of the fluid pulse falling from the front edge to the rear edge can be damaged, the flow state of the opening part is obviously changed, and the noise line spectrum of the flow excited opening is restrained. However, the existence of the air guide sleeve disturbs the flow field near the opening, and high-frequency noise is possibly caused to be overhigh at a certain navigational speed. Therefore, active control measures are urgently needed, low-frequency line spectrum and high-frequency noise are considered, and the flow excitation hole noise is controlled. In recent years, in the field of aerospace, a perforated flow-induced oscillation noise active control device is researched for an air medium, but reports applied to underwater perforated flow-induced line spectrum noise active control are not found at present.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an trompil class of flow induced noise liquid filling formula active control device under water, the device can work under water, simple structure, easily realization, reliability height, simple to operate, environmental suitability are strong, can realize the active control to trompil class of flow induced line spectrum noise under water.
Realize the technical scheme of the utility model as follows:
an underwater tapping flow excitation noise liquid filling type active control device comprises a liquid cavity, a vibration/pulsation force monitoring sensor, a control box and a hydraulic pump/valve; the liquid cavity is embedded and installed on the front edge of the underwater opening, the vibration/pulsation force monitoring sensor is installed on the opening, the control box is connected with the vibration/pulsation force monitoring sensor and the hydraulic pump/valve, the liquid cavity is connected with the hydraulic pump/valve, and the control box controls the hydraulic pump/valve to fill and discharge liquid into the liquid cavity according to the monitoring result of the vibration/pulsation force monitoring sensor.
Further, the epidermis of sap cavity is for having the rubber skin of certain extensibility and crushing resistance, and the rubber skin maximum elongation is more than 500%, and the maximum pressure of bearing is more than 4.5 MPa.
Furthermore, the vibration/pulsation force monitoring sensor of the present invention is a dry-end vibration sensor or a wet-end pulsation pressure sensor, and is installed on the inner surface of the underwater opening when being the dry-end vibration sensor, and is installed on the installation hole reserved on the outer surface of the underwater opening when being the wet-end pulsation pressure sensor; the control box is used for monitoring pulsating pressure or a vibration line spectrum generated by the flow excitation hole in real time and feeding back the pulsating pressure or the vibration line spectrum to the control box, and the control box adjusts a control strategy in real time according to the input of the vibration/pulsating force monitoring sensor.
Furthermore, the control box of the utility model is the center of the whole control system, and the real-time judgment is carried out according to the data collected by the vibration/pulsation force monitoring sensor, if a low-frequency line spectrum is generated, the hydraulic pump/valve is started to fill liquid, and when the pulsation line spectrum disappears, the liquid filling is stopped; if the high-frequency noise rises, liquid in the liquid cavity is extracted, and the low-frequency and the medium-high-frequency flow-induced noise are both at a low level.
Further, hydraulic pump/valve is low noise intelligence pump/valve, and its state of opening and flow are controlled by the control box, and hydraulic pump/valve adopts double-deck vibration isolation device vibration isolation, can not produce strong mechanical noise when opening.
Advantageous effects
The utility model discloses trompil flow induced noise initiative controlling means under water, its structural style is simple, and the motion piece is few, and the reliability is high, and can compromise low frequency line spectrum and high-frequency pulsation's control, and the device is out of work, can not introduce extra noise, also can guarantee the operational capability in deep water high-pressure environment.
Drawings
FIG. 1 is a schematic diagram of the mechanism of flow induced hole noise generation;
FIG. 2 is a schematic diagram of the mechanism of the turbulent fluid excitation of the present invention;
fig. 3 is a schematic view of the present invention, wherein fig. 3(a) is a state when the liquid chamber is not filled with liquid, and fig. 3(b) is a state when the liquid chamber is not filled with liquid;
fig. 4 is a comparison of the pulsating pressure before and after opening the liquid filled chamber (corresponding to the dome).
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.
The mechanism of open hole flow line spectral noise is as follows: after flowing through the opening, the fluid medium generates vortex shedding at the front edge of the opening, the vortex shedding from the front edge impacts the rear edge of the opening along with the movement of the fluid, so that a pressure feedback effect is generated, the vortex shedding of the front edge can be influenced by the pressure feedback, the vortex shedding of the front edge can be intensified under a certain Reynolds number, and the vortex shedding further impacts the rear edge of the opening, so that periodic noise is generated, as shown in FIG. 1. Meanwhile, as the self-sustaining oscillation frequency is close to the natural frequency of the structure/cavity, the excitation structure/cavity vibrates under the natural frequency, and strong line spectrum noise is generated, so that strong noise is radiated. Therefore, as long as the periodic oscillation formed at the opening can be disturbed, the open-hole streamline spectral noise can be reduced from the source.
The embodiment of the utility model provides an underwater trompil flow induced noise liquid filling formula active control device, it mainly is applicable to the low frequency line spectrum noise that reduces the flow induced trompil and arouses simultaneously high frequency noise's rising when high speed, as shown in fig. 3(a) - (b), including sap cavity 1, vibration/pulsation force monitoring sensor 2, control box 3 and hydraulic pump/valve 4; the hydraulic control system is characterized in that the liquid cavity 1 is embedded and installed on the front edge of an underwater opening, the vibration/pulsation force monitoring sensor 2 is installed on the opening, the control box 3 is connected with the vibration/pulsation force monitoring sensor 2 and the hydraulic pump/valve 4, the liquid cavity 1 is connected with the hydraulic pump/valve 4, and the control box 3 controls the hydraulic pump/valve 4 to fill and discharge liquid into the liquid cavity according to the monitoring result of the vibration/pulsation force monitoring sensor 2.
The present embodiment is based on the mechanism of flow-induced noise generation by the open-cell structure, and the liquid chamber 1 is installed at the open-cell leading edge as shown in fig. 2. The generation of flow-induced noise strong line spectrum is mainly characterized by that the vortex of open-pore front edge can be impacted on the rear edge and can be used for making gain feedback action on front edge vortex, when the flow-induced noise strong line spectrum is produced, the nearby flow field must exhibit periodic same-phase oscillation characteristic, at the moment, the dry-end vibration sensor/wet-end pulsating pressure sensor can detect periodic vibration/pulsation phenomenon, said phenomenon can be fed back to control box by means of sensor, said control box can judge that the low-frequency flow-induced line spectrum must be eliminated, and can open hydraulic pump/valve to make liquid cavity be filled with liquid, until the sensor data can display that the low-frequency line spectrum is reduced or. If the device causes flow field high-frequency pulsation to be abnormal along with the increase of the navigational speed and the high-frequency data of the sensor is higher, liquid in the liquid cavity is extracted, and the high-frequency pulsation is reduced. The control principle of the whole device is to reduce high-frequency noise as much as possible on the premise of controlling a low-frequency line spectrum. As shown in FIG. 4, the pulsating pressure before and after the liquid filled chamber (corresponding to the diversion cover) is added to the opening.
The embodiment of the utility model provides a liquid such as hydraulic oil/water is inside to the liquid chamber, and the crust is for having the rubber skin of certain extensibility and crushing resistance, and the rubber skin maximum energy elongation exceeds 500%, and the maximum bearing pressure exceeds 4.5 MPa.
The embodiment of the utility model provides a vibration/pulsation force monitoring sensor is dry end vibration sensor or wet end pulsation pressure sensor, when being dry end vibration sensor, installs at the internal surface of trompil under water, when being wet end pulsation pressure sensor, installs on the mounting hole that the trompil surface was reserved under water; the control box is used for monitoring pulsating pressure or a vibration line spectrum generated by the flow excitation hole in real time and feeding back the pulsating pressure or the vibration line spectrum to the control box, and the control box adjusts a control strategy in real time according to the input of the vibration/pulsating force monitoring sensor.
The embodiment of the utility model provides a control box is whole control system's maincenter, according to the data that vibration/pulsating force monitoring sensor gathered, judges in real time, if there is low frequency line spectrum to produce then starts hydraulic pump/valve, carries out the topping-up, if the high frequency noise risees then the liquid of extract liquid intracavity, guarantees that the flow induced noise all is in lower level at low frequency and medium and high frequency.
The embodiment of the utility model provides a hydraulic pump/valve is low noise intelligence pump/valve, and its state of opening and flow are controlled by the control box control, and hydraulic pump/valve adopts double-deck vibration isolation device vibration isolation, can not produce strong mechanical noise when opening.
The utility model discloses trompil flow induced noise liquid filling formula active control device's work process under water does: when the underwater vehicle sails underwater, the vibration/pulsating force monitoring sensor 2 can monitor the structure vibration/flow field pulsating pressure information in real time, when a low-frequency line spectrum appears in monitoring data, the sensor 2 feeds back the phenomenon to the control box 3, the control box 3 judges that the low-frequency line spectrum needs to be eliminated, and the hydraulic pump/valve 4 is opened to enable the liquid cavity 1 to be filled with liquid. After the liquid chamber 1 is filled with liquid, the periodic same-phase pulsating force of the flow field is interfered, so that the pulsating line spectrum of the flow field disappears, at the moment, when the data of the sensor 2 can display the data in real time that the pulsating line spectrum disappears, the hydraulic pump/valve 4 is closed, and the liquid chamber 1 stops filling liquid. If the device causes flow field high-frequency pulsation to be abnormal along with the increase of the navigational speed and the high-frequency data of the sensor 2 is higher, the control box 3 controls to open the hydraulic pump/valve 4, pump out the liquid in the liquid cavity 1 and reduce the high-frequency pulsation. The control principle of the whole device is to reduce high-frequency noise as much as possible on the premise of controlling a low-frequency line spectrum, so that the lowest overall noise is realized.
The utility model discloses trompil flow induced noise liquid filling formula active control device equipment step is as follows under water:
a) installing a vibration sensor 2 in the structure, and installing a pulsating pressure sensor 2 on an opening reserved on the inner surface of the cavity without changing the inner surface form of the cavity;
b) the vibration/pulsation force monitoring sensor 2 is connected to a control box 3 in the cabin through a data line;
c) the control box is connected with the hydraulic pump/valve through a control line and can control the opening and closing of the hydraulic pump/valve 4;
d) the liquid cavity 1 is embedded and installed on the front edge of the opening, so that the linear smoothness of the surface of the opening is ensured when the device does not work;
e) the hydraulic pump/valve 4 is connected with the external liquid cavity 1 through a thin pipe, and a stop valve is installed to ensure that external seawater cannot be poured into the cabin when the device is damaged.
In summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An underwater tapping flow excitation noise liquid filling type active control device is characterized by comprising a liquid cavity (1), a vibration/pulsating force monitoring sensor (2), a control box (3) and a hydraulic pump/valve (4); the liquid cavity (1) is embedded and installed on the front edge of an underwater opening, the vibration/pulsation force monitoring sensor (2) is installed on the opening, the control box (3) is connected with the vibration/pulsation force monitoring sensor (2) and the hydraulic pump/valve (4), the liquid cavity (1) is connected with the hydraulic pump/valve (4), and the control box (3) controls the hydraulic pump/valve (4) to fill and discharge liquid into the liquid cavity according to the monitoring result of the vibration/pulsation force monitoring sensor (2).
2. An underwater tapping flow-induced noise liquid-filled active control device according to claim 1, wherein the surface of the liquid cavity (1) is rubber, the maximum elongation of the rubber exceeds 500%, and the maximum bearing pressure exceeds 4.5 MPa.
3. The underwater tapping flow-induced noise liquid-filled active control device according to claim 1, wherein the vibration/pulsation force monitoring sensor (2) is a dry-end vibration sensor or a wet-end pulsation pressure sensor, and is installed on the inner surface of the underwater tapping when being the dry-end vibration sensor, and is installed on a mounting hole reserved on the outer surface of the underwater tapping when being the wet-end pulsation pressure sensor; the device is used for monitoring pulsating pressure or vibration line spectrum generated by the flow excitation hole in real time and feeding back the pulsating pressure or vibration line spectrum to the control box.
4. The underwater tapping flow-excited noise liquid-filled active control device according to claim 1, wherein the control box judges in real time according to data collected by the vibration/pulsation force monitoring sensor (2), starts the hydraulic pump/valve (4) to fill liquid if a low-frequency line spectrum is generated, stops filling liquid when the pulsation line spectrum disappears, and extracts liquid in the liquid cavity if high-frequency noise rises.
5. An underwater tapping flow-excited noise-filled active control device as claimed in claim 1, wherein the hydraulic pump/valve (4) is a low-noise intelligent pump/valve, the opening state and flow rate of which are controlled by the control box (3), and the hydraulic pump/valve (4) is vibration-isolated by a double-layer vibration isolation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921138722.8U CN211442712U (en) | 2019-07-19 | 2019-07-19 | Underwater perforated flow excitation noise liquid filling type active control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921138722.8U CN211442712U (en) | 2019-07-19 | 2019-07-19 | Underwater perforated flow excitation noise liquid filling type active control device |
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| CN211442712U true CN211442712U (en) | 2020-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110450930A (en) * | 2019-07-19 | 2019-11-15 | 中国船舶重工集团公司第七一九研究所 | A kind of sharp liquid-filled active control device of noise of underwater aperture stream |
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2019
- 2019-07-19 CN CN201921138722.8U patent/CN211442712U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110450930A (en) * | 2019-07-19 | 2019-11-15 | 中国船舶重工集团公司第七一九研究所 | A kind of sharp liquid-filled active control device of noise of underwater aperture stream |
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