CN108844620B - gravity type propeller noise measuring device - Google Patents
gravity type propeller noise measuring device Download PDFInfo
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- CN108844620B CN108844620B CN201810663147.7A CN201810663147A CN108844620B CN 108844620 B CN108844620 B CN 108844620B CN 201810663147 A CN201810663147 A CN 201810663147A CN 108844620 B CN108844620 B CN 108844620B
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- water tank
- propeller
- noise measurement
- measurement device
- gravity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The invention provides gravity type propeller noise measurement devices, which comprise a high-level water tank, an experimental water tank and a reservoir which are sequentially connected through a water pipe, wherein a long shaft dynamometer, a propeller and a hydrophone are installed in the experimental water tank, the hydrophone is connected with a computer, the reservoir is divided into two parts, a part is an open part, another part is a closed part, a partition plate is arranged between the two parts, an air bag is arranged in the closed part, the open part is connected with the experimental water tank, a valve is arranged on a communicated water pipe, the closed part is connected with the high-level water tank, and a second valve is arranged on the communicated water pipe.
Description
Technical Field
The invention relates to propeller noise detection devices.
Background
The method for measuring the propeller noise by the circulating water tank commonly used at present has to face the influence of background noise on an experiment, because the circulating water tank usually utilizes a motor to realize water recycling, and the motor for circulating water and the motor for rotating the propeller often work at the same time, so that the influence of environmental noise on the experiment is increased.
Disclosure of Invention
The invention aims to provide gravity propeller noise measuring devices capable of reducing the influence of background noise on measurement.
The water storage tank is divided into two parts, wherein part is an open part, part is a closed part, a partition plate is arranged between the two parts, an air bag is arranged in the closed part, the open part is connected with the experimental water tank, a valve is arranged on a communicating water pipe, the closed part is connected with the high-level water tank, and a second valve is arranged on the communicating water pipe.
The present invention may further comprise:
1. the propeller is arranged on the long-axis dynamometer, and the hydrophone is arranged on the same plane of the propeller disk surface and is right opposite to the center of the propeller disk surface.
2. The volume ratio of the open part to the closed part of the reservoir was 3: 2.
3. A filter screen is arranged in front of the partition plate between the opening part and the closing part of the reservoir.
4. The high-level water tank is an open type rainwater collector.
The invention provides propeller noise measurement devices for reducing background noise, which reduce the influence of the background noise on a target experiment during noise measurement through an independent propeller noise measurement experiment.
The main characteristics of the invention include:
1. rainwater is collected and stored through the rainwater collector, gravitational potential energy of rainwater is converted into kinetic energy, the second valve is opened, an experiment is carried out, the valve controls flow rate of water flow, when the experiment is carried out, the long-axis power meter is started to enable the propeller to rotate, and noise of the propeller is collected through the hydrophone and transmitted to the computer.
2. The grading utilization of the reservoir is realized by that water enters the reservoir (an open part) through a water pipe when an experiment is carried out, the second valve is closed when the experiment is completed, the partition plate is opened to enable the water in the open part to enter the closed part, the partition plate is closed when the water surface is static, and then the air bag is inflated to enable the water in the reservoir (the closed part) to enter the rainwater collector again.
The invention separates the noise measurement experiment from the circulating water by utilizing the graded utilization of the reservoir, and performs the experiment by utilizing the collected rainwater, thereby reducing the operation of the motor during the circulating water, achieving the purpose of reducing the influence of background noise on the experiment, ensuring that the experiment result is more authentic and more reliable.
Drawings
Fig. 1 is a schematic structural diagram of a gravity propeller noise measurement device according to the present invention.
Fig. 2 is a schematic structural diagram of an experimental water tank.
Fig. 3 is a schematic structural diagram of a water reservoir.
Detailed Description
The invention is described in more detail below by way of example.
Referring to fig. 1 to 3, the gravity propeller noise measurement device of the present invention includes a rainwater collector 1, a water pipe 2, an th valve 3, an experimental water tank 4, a long axis dynamometer 5, a propeller 6, a hydrophone 7, a second valve 8, a reservoir open portion 9, a filter screen 10, a partition 11, a reservoir closed portion 12, and an air bag 13, wherein the rainwater collector 1 is ultra-large reservoirs disposed at high positions and connected to the experimental water tank 4 through water pipes, the water pipe is provided with th valve 3 and a second valve 8 for controlling the size of water flow and the progress of an experiment, respectively, the experimental water tank 4 is provided with the long axis dynamometer 5, the propeller 6 is mounted on the long axis dynamometer 5, the hydrophone 7 is used for collecting noise generated when the propeller 6 rotates and is connected to a computer, is disposed on the same plane as plane of the propeller plate, and is centered with respect to the propeller plate, the reservoir is divided into two portions, is partially open, is partially closed, the space ratio is 3:2, the intermediate portion is separated by the partition 11, the filter screen 10 is disposed in front of the partition 11, and the closed portion is disposed in order to block other portions of.
The basic principle of the invention is as follows:
1. the rainwater collector achieves the purpose of reducing energy consumption by collecting rainwater, the second valve controls the proceeding and stopping of a noise test in the experimental water tank, when the test is performed, the second valve is opened to enable rainwater to enter the experimental water tank, after water flow is stable, the long-axis power instrument is started to enable a propeller on the long-axis power instrument to rotate, noise of the propeller under different working conditions is measured by controlling the rotating speed and the flow rate, the noise collection is realized through a hydrophone, the hydrophone collects the noise and converts the noise into an electric signal to be transmitted to a computer for conducting analysis processing of steps, and water flow passes through the experimental water tank and finally enters a reservoir (an open part).
2. After the experiment is finished, the second valve is closed, the partition plate is opened at the same time, water in the reservoir (the open part) enters the reservoir (the closed part), a filter screen is arranged between the second valve and the closed part to prevent other things from entering the reservoir (the closed part) so as to influence the service life of the device, and after the water surface is stable, the partition plate is closed, the air bag is inflated, and the water in the reservoir (the closed part) enters the rainwater collector.
3. The invention effectively reduces the influence of background noise on the noise measurement experiment of the propeller by separating the experiment part of the noise measurement experiment from the circulating water part through the graded utilization of the reservoir, and meanwhile, the invention provides new noise measurement methods which can more accurately measure the noise when the propeller moves.
Claims (9)
- The gravity type propeller noise measurement device is characterized in that the water storage tank is divided into two parts, namely a part which is an open part and a part which is a closed part, a partition plate is arranged between the two parts, an air bag is arranged in the closed part, the open part is connected with the experimental water tank, a second valve is arranged on a communicating water pipe, the closed part is connected with the high-level water tank, the high-level water tank is connected with the experimental water tank through a water pipe, and a valve is arranged on the communicating water pipe.
- 2. The gravity propeller noise measurement device of claim 1, wherein the propeller is mounted on a long-axis dynamometer, and the hydrophone is mounted on the same plane of the propeller and is aligned with the center of the plane of the propeller.
- 3. A gravity propeller noise measurement device according to claim 1 or 2, wherein: the volume ratio of the open part to the closed part of the reservoir was 3: 2.
- 4. A gravity propeller noise measurement device according to claim 1 or 2, wherein: a filter screen is arranged in front of the partition plate between the opening part and the closing part of the reservoir.
- 5. A gravity propeller noise measurement device according to claim 3, wherein: a filter screen is arranged in front of the partition plate between the opening part and the closing part of the reservoir.
- 6. A gravity propeller noise measurement device according to claim 1 or 2, wherein: the high-level water tank is an open type rainwater collector.
- 7. A gravity propeller noise measurement device according to claim 3, wherein: the high-level water tank is an open type rainwater collector.
- 8. The gravity propeller noise measurement device of claim 4, wherein: the high-level water tank is an open type rainwater collector.
- 9. The gravity propeller noise measurement device of claim 5, wherein: the high-level water tank is an open type rainwater collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810663147.7A CN108844620B (en) | 2018-06-25 | 2018-06-25 | gravity type propeller noise measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810663147.7A CN108844620B (en) | 2018-06-25 | 2018-06-25 | gravity type propeller noise measuring device |
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| Publication Number | Publication Date |
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| CN108844620A CN108844620A (en) | 2018-11-20 |
| CN108844620B true CN108844620B (en) | 2020-01-31 |
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| CN201810663147.7A Active CN108844620B (en) | 2018-06-25 | 2018-06-25 | gravity type propeller noise measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110763323A (en) * | 2019-10-25 | 2020-02-07 | 哈尔滨工程大学 | Low-frequency noise measuring device based on sound wave total reflection |
| CN114397006B (en) * | 2022-02-15 | 2023-03-21 | 西南交通大学 | Propeller flow noise measurement system under oscillation and steering motion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2399456Y (en) * | 1999-08-18 | 2000-10-04 | 袁同舟 | Built-in air sac enclosed cistern |
| US7607351B2 (en) * | 2007-06-26 | 2009-10-27 | General Electric Company | Acoustic impact detection and monitoring system |
| CN103590445A (en) * | 2012-08-18 | 2014-02-19 | 成都措普科技有限公司 | Pressure-proof outdoor water storage device |
| CN205421398U (en) * | 2016-03-23 | 2016-08-03 | 嘉诚环保工程有限公司 | Rainwater collection and treatment system |
| CN205999979U (en) * | 2016-08-29 | 2017-03-08 | 新世纪建设集团有限公司 | A kind of job site Novel variable-frequency energy-saving water supply system |
| CN107941404B (en) * | 2017-11-01 | 2019-10-25 | 武汉理工大学 | A kind of pump dynamograph of the propeller proximal end test of small and exquisite exquisiteness |
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