Underwater rotating body target low-target-strength appearance design method
An underwater rotation, target strength technology, applied in design optimization/simulation, constraint-based CAD, etc., can solve problems such as poor low frequency performance and weakening of rigid echoes
Pending Publication Date: 2021-03-02
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology
[0003] The purpose of the present invention is to improve the acoustic stealth performance in water, overcome the defects of poor low-frequency performance of the existing acoustic covering layer, improve the stealth effect of high-frequency target in water, and weaken its rigid echo through the designed surface line type
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[0032] Such as image 3 As shown, the low target strength shape design method of the 533 torpedo head includes the following steps:
[0033] S1: The initial shape of the head of the 533 torpedo is as follows Figure 4 As shown in (a), the initial 533 torpedo head shape is obtained by fitting as follows Figure 4 The specific function of the bus line type shown in (b) is z=-0.7(r / 0.27) 6 +0.35;
[0034] S2: The selected deviation function is an N-order Bernstein polynomial:
[0035]
[0036] Adding the initial bus line shape function and the deviation function is the designed bus line shape function:
[0037]
[0038] So as to obtain the target shape of the underwater rotating body after design;
[0039] S3: The volume of the original underwater target rotating body is V 0 =0.1202m 3 , the selected constraint condition is 85% V of the volume of the underwater target rotating body 0 ≤V≤115%V 0 , the gradient of the initial bus linear function The initial value o...
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An underwater rotating body target low-target-strength appearance design method comprises the steps: adopting an iterative algorithm, taking a target function result as a standard, performing iterative calculation on target functions in different deviation variable ranges within the range meeting constraint conditions, when the target function result is the lowest, determining a lower corresponding deviation variable, substituting the deviation variable into a deviation function, and adding the initial underwater target bus line type function and the deviation function to obtain a designed busline type function, wherein the deviation function is represented by a Bernstein polynomial or a sine series polynomial, and the deviation variable is an item coefficient of the polynomial. Accordingto the method provided by the invention, the designed underwater target has lower receiving and transmitting combined sound target strength than the original line type under the given detection frequency range and detection angle, the sound echo energy of the target is greatly weakened, and the sound stealth performance of the underwater target is improved. After the underwater target is designed, echo energy of the underwater target can be more uniformly dispersed into a spatial azimuth angle, so the strength of a transceiving combined target is greatly reduced.
Description
technical field [0001] The invention belongs to the technical field of underwater target acoustic stealth. The invention relates to an acoustic stealth iterative algorithm for an underwater target, in particular to a low target intensity shape design method for an underwater rotating body target. Background technique [0002] With the development of underwater acoustic countermeasure technology, how to design the shape of underwater targets more scientifically, so as to effectively reduce the intensity of their acoustic targets and improve their acoustic concealment is one of the research topics of underwater acoustic physics. The shape design of traditional warships or small underwater vehicles mostly adopts the method of empirical design, and then performs performance comparison to obtain a better shape. However, the traditional shape design does not consider the change of echo intensity brought about by the development of active sonar detection. With the rapid developme...
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Login to View More IPC IPC(8): G06F30/27G06F111/04
CPCG06F30/27G06F2111/04
Inventor 彭子龙韩林江李兵温华兵
Owner JIANGSU UNIV OF SCI & TECH