CN113806864A - Marine metal propeller flow-induced vibration identification method based on noise cloud chart - Google Patents
Marine metal propeller flow-induced vibration identification method based on noise cloud chart Download PDFInfo
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/10—Geometric CAD
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Abstract
The invention relates to a marine metal propeller flow-induced vibration identification method based on a noise cloud picture, which is used for constructing a noise cloud picture at a natural frequency by utilizing propeller noise data under a series of specific working conditions acquired by a water tank test and identifying whether flow-induced resonance of a metal propeller exists or not.
Description
Technical Field
The invention belongs to the technical field of marine metal propeller design, and particularly relates to a marine metal propeller flow-induced vibration identification method based on a noise cloud picture.
Background
Propeller noise is one of the major sources of noise in ships, including propeller flow induced noise and flow induced vibration noise. Among them, there is a flow-induced vibration noise in a special working state: when the fluid exciting force frequency is consistent with the inherent frequency of the propeller, resonance is caused, so that the propeller generates strong vibration and narrow-band spectrum noise, the ship comfort is seriously affected, and once the propeller has the situation under the design working condition, the situation is difficult to eliminate, and the propeller needs to be redesigned. Therefore, it is necessary to identify the presence of "resonance" between the propeller and the fluid excitation during the design phase, avoiding the undesirable situation of strong vibration in real-vessel applications.
At present, no matter theoretical calculation or model test is adopted, flow noise or flow-induced vibration noise cannot be separated from propeller noise; therefore, in the design practice of the propellers, the propellers are assumed to be rigid bodies, flow-induced vibration noise does not exist, and only flow-induced noise is evaluated; and no effective means is available for quantitatively/qualitatively evaluating the flow-induced vibration noise of the propeller; in particular, it is possible to predict the presence of strong "resonance" phenomena.
Disclosure of Invention
The invention aims to provide a marine metal propeller flow-induced vibration identification method based on a noise cloud chart, aiming at the technical requirements, and the method is used for judging whether strong vibration at the inherent frequency of the propeller caused by fluid exists in each navigation working condition of a real ship or not, fills the blank of the method for identifying the phenomenon at the design stage of the domestic propeller, can support the design of the marine metal propeller, and reduces the risk of strong vibration at the inherent frequency when the real ship is applied.
In order to achieve the purpose, the invention adopts the following technical scheme: a marine metal propeller flow-induced vibration identification method based on a noise cloud chart is characterized by comprising the following steps:
s1) measuring the natural frequency in the propeller model water:
manufacturing a metal propeller model, wherein the metal propeller model is similar to a real propeller in geometry and is made of the same material, and the natural frequency of the model propeller is obtained by adopting a standard hammer excitation method in static water;
s2), drawing a test condition limit curve graph, and determining the test condition:
the abscissa of the test working condition limit curve graph is rotating speed, the ordinate is water speed, according to the curve envelope graph determined by the hydrodynamic force of the propeller, cavitation and various limit conditions of the test instrument, in the envelope area, according to the equal rotating speed and the equal water speed interval, the test working condition points are dispersed into a matrix type;
s3) obtaining full band noise of paddle model based on water tank test:
measuring the noise and the background noise of the propeller model under all working conditions in the range in a circulating water tank, wherein the water speed interval and the rotating speed interval can be determined by comprehensively considering the test workload and the required test result resolution;
s4) a propeller noise cloud map is drawn:
extracting inherent frequency f of each test working condition based on series test working condition propeller full-frequency-band noise continuous spectrum datanTotal noise level in the range of + -50 Hz with frequency separation of 1Hz, fnThe noise cloud picture is an nth order natural frequency range and corresponds to the matrix type test working condition points of the working condition limiting curve graph one by one, and the noise cloud picture is drawn by representing the total noise amplitude value through colors;
s5) determining whether high-amplitude narrow-band noise exists:
according to the corresponding relation between the rotating speed and the navigational speed of the model propeller and the real propeller determined by the real ship rapidity forecast of the propeller, according to the similarity criterion of the rapid self-navigation test of the ship:
wherein n ismIs the rotational speed of the paddle die, nsIs the rotating speed of the propeller VmFor model testing water velocity, VsThe curve representing the working state of the real ship during straight navigation at constant speed is drawn on a color noise cloud picture, namely the real ship Vs-nsJudging whether the actual working line is overlapped with a region with higher noise according to the corresponding relation curve, and if so, considering that stronger flow-induced vibration occurs in the overlapped region corresponding to the working condition, and generating high-amplitude narrow-band spectrum noise; if not, the above is not considered to occur.
According to the scheme, the limiting curve in the step S2 comprises the following steps: the device comprises a water speed limiting line, a rotating speed limiting line, a dynamometer thrust, a torque, a power limiting line, a propeller zero thrust limiting line and a propeller cavitation-free limiting line. The water speed limiting line is a water tank water speed limiting value, the rotating speed limiting line is a water tank rotating speed limiting value, the power instrument thrust, torque and power limiting lines are maximum positive thrust, torque and power allowed by the power instrument, the propeller zero thrust limiting line is calculated according to a speed advancing coefficient corresponding to a thrust zero point of a first quadrant open water performance curve of the propeller, and the propeller non-cavitation limiting line is calculated according to propeller cavitation bucket (cavitation limit line) data.
The invention has the beneficial effects that: the marine metal propeller flow-induced vibration identification method based on the noise cloud picture is characterized in that a noise cloud picture at the inherent frequency is constructed by utilizing propeller noise data collected by a water tank test under a series of specific working conditions, whether flow-induced noise of a metal propeller exists or not is identified, the limitation that the flow-induced noise is individually evaluated by the traditional water tank test is effectively overcome, whether a strong resonance phenomenon exists or not is judged in advance under the condition that the flow-induced noise and the flow-induced vibration noise of the propeller are not separated, the blank that the phenomenon method is identified at the domestic propeller design stage is filled, the design of the marine metal propeller can be supported, and the risk that the strong vibration at the inherent frequency exists when the marine metal propeller is applied to a real ship is reduced.
Drawings
FIG. 1 is a diagram of the natural frequency in water for a propeller according to one embodiment of the present invention.
FIG. 2 is a graph of a model test condition limit according to an embodiment of the present invention.
FIG. 3 is a schematic view of a model noise continuum of a propeller, in accordance with an embodiment of the present invention.
Fig. 4 is a cloud of noise at a natural frequency for one embodiment of the invention.
FIG. 5 is a block flow diagram of one embodiment of the present invention.
Detailed Description
The embodiments of the present invention will now be described with reference to the accompanying drawings, and the present invention is not limited to the following examples.
As shown in fig. 5, a marine metal propeller flow-induced vibration noise identification method based on a noise cloud chart is characterized by comprising the following steps:
(1) drawing a limit curve chart of the test working condition and determining the test working condition
The test condition limiting curve diagram is a curve envelope diagram with the abscissa as the rotating speed and the ordinate as the water speed and internally determined according to various limiting conditions of propeller hydrodynamic force, cavitation, test instruments and the like. The method specifically comprises the following curves:
a. a water speed limit line;
b. a rotational speed limit line;
c. the thrust, torque and power limiting lines of the dynamometer;
d. and a propeller zero thrust limit line.
e. The propeller has no cavitation limit line.
It should be noted that the determination of the subsequent test conditions (i.e., the test rotation speed and the water speed) is an important basis for constructing the noise cloud chart, and is different from the conventional propeller water tank test that the test conditions of the designated speed are determined by adopting an equal-thrust method or an equal-torque method according to the result of the rapidity test, but the test condition points are discretized into matrix type test condition points according to the interval of the equal rotation speed and the equal water speed in the envelope region according to the test condition limit curve diagram.
(2) Constructing noise cloud pictures
Extracting inherent frequency f of each test working condition based on series test working condition propeller full-frequency-band noise data (generally in a range of 0.8-80 kHz)n±50Hz(fnThe frequency interval is 1Hz) in the range of the nth order natural frequency, and the noise total level is in one-to-one correspondence with the matrix type test working condition points of the working condition limit curve graph, and the amplitude of the noise total level is represented by colors, so that the drawing of the noise cloud picture is completed.
(3) Identifying propeller flow-induced vibration
And drawing a real ship working state curve based on the noise cloud picture, and identifying whether the real ship working state curve is overlapped with a high-noise area. If so, the propeller is considered to generate strong flow-induced vibration under the working condition corresponding to the overlapping region, and meanwhile, high-amplitude narrow-band spectrum noise is generated; if not, the above is not considered to occur.
Example one
In still water, model paddle natural frequencies were obtained using standard hammer-shock methods (see fig. 1).
The metal propeller model should satisfy the geometric similarity and the same material with the real propeller. When the trailing edge and the blade tip thickness of the propeller model are less than 0.3mm, the thickness is adjusted to 0.3mm so as to avoid the influence of the 'singing sound' of the propeller on the validity of the test result in the test process.
The test condition limit graph (see fig. 2) has the following limit lines:
a. water speed limiting line: water speed limit of the water tank;
b. speed limit line: a water tank rotation speed limit value;
c. dynamometer thrust, torque, power limit line: maximum positive thrust, torque and power allowed by the dynamometer;
d. propeller zero thrust limit line: and calculating the corresponding advancing speed coefficient according to the thrust zero point of the open water performance curve of the first quadrant of the propeller.
e. The propeller has no cavitation limit line: and calculating according to the propeller cavitation bucket data.
And (3) measuring the model noise and the background noise of the propeller under all working conditions within the limit line range determined in the step 2 in a circulating water tank, wherein the water speed interval is 0.1m/s, and the rotating speed interval of the propeller mould is 0.15 rps. The water speed interval and the rotating speed interval can be determined by comprehensively considering the test workload and the required test result resolution.
Extracting inherent frequency f of each test working condition based on series test working condition propeller full-frequency-band noise continuous spectrum datan±50Hz(fnNth order natural frequency) range, and testing with the working condition limit curve matrixThe working condition points are in one-to-one correspondence, and the noise total level amplitude is represented by colors, so that the drawing of a noise cloud picture (see figure 4) is completed.
And determining the corresponding relation between the rotating speed and the navigational speed of the model propeller and the real propeller according to the real propeller ship rapidity forecast. (according to the similarity criterion of the ship rapid self-propulsion test:
wherein n ismIs the rotational speed of the paddle die, nsIs the rotating speed of the propeller VmFor model testing water velocity, VsThe speed of a real ship is measured, and lambda is a reduced scale ratio) is plotted on a color noise cloud chart to represent the working state curve of the real ship when the real ship is in constant speed straight navigation, namely the real ship Vs-nsAnd (5) judging whether the actual working line is overlapped with the area with higher noise or not according to the relation curve. If so, the propeller is considered to have strong flow-induced vibration under the working condition corresponding to the overlapping region, and high-amplitude narrow-band spectrum noise is generated; if not, the above is not considered to occur.
Claims (3)
1. A marine metal propeller flow-induced vibration identification method based on a noise cloud chart is characterized by comprising the following steps:
s1) measuring the natural frequency in the propeller model water:
manufacturing a metal propeller model, wherein the metal propeller model is similar to a real propeller in geometry and is made of the same material, and the natural frequency of the model propeller is obtained by adopting a standard hammer excitation method in static water;
s2), drawing a test condition limit curve graph, and determining the test condition:
the abscissa of the test working condition limit curve graph is rotating speed, the ordinate is water speed, according to the curve envelope graph determined by the hydrodynamic force of the propeller, cavitation and various limit conditions of the test instrument, in the envelope area, according to the equal rotating speed and the equal water speed interval, the test working condition points are dispersed into a matrix type;
s3) obtaining full band noise of paddle model based on water tank test:
measuring the noise and the background noise of the propeller model under all working conditions in the range in a circulating water tank, wherein the water speed interval and the rotating speed interval can be determined by comprehensively considering the test workload and the required test result resolution;
s4) a propeller noise cloud map is drawn:
extracting inherent frequency f of each test working condition based on series test working condition propeller full-frequency-band noise continuous spectrum datanTotal noise level in the range of + -50 Hz with frequency separation of 1Hz, fnThe noise cloud picture is an nth order natural frequency range and corresponds to the matrix type test working condition points of the working condition limiting curve graph one by one, and the noise cloud picture is drawn by representing the total noise amplitude value through colors;
s5) determining whether high-amplitude narrow-band noise exists:
according to the corresponding relation between the rotating speed and the navigational speed of the model propeller and the real propeller determined by the real ship rapidity forecast of the propeller, according to the similarity criterion of the rapid self-navigation test of the ship:
wherein n ismIs the rotational speed of the paddle die, nsIs the rotating speed of the propeller VmFor model testing water velocity, VsThe curve representing the working state of the real ship during straight navigation at constant speed is drawn on a color noise cloud picture, namely the real ship Vs-nsAnd (4) judging whether the actual working line is overlapped with the region with higher noise or not according to the corresponding relation curve, if so, considering that stronger flow-induced vibration occurs in the overlapped region corresponding to the working condition, and generating high-amplitude narrow-band spectrum noise, and if not, considering that the situation cannot occur.
2. The marine metal propeller flow-induced vibration identification method based on the noise cloud picture as claimed in claim 1, wherein the limiting curve in step S2 includes: the device comprises a water speed limiting line, a rotating speed limiting line, a dynamometer thrust, a torque, a power limiting line, a propeller zero thrust limiting line and a propeller cavitation-free limiting line.
3. The marine metal propeller flow-induced vibration identification method based on the noise cloud picture as claimed in claim 2, wherein the water speed limit line is a water tank water speed limit value, the rotation speed limit line is a water tank rotation speed limit value, the power meter thrust, torque and power limit lines are maximum positive thrust, torque and power allowed by the power meter, the propeller zero thrust limit line is calculated according to a speed coefficient corresponding to a thrust zero point of a propeller first quadrant open water performance curve, and the propeller void-free limit line is calculated according to propeller void bucket data.
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| CN114397006A (en) * | 2022-02-15 | 2022-04-26 | 西南交通大学 | Propeller flow noise measurement system under oscillation and steering motion |
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