2011
DOI: 10.1088/1674-1056/20/7/074301
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The diffracted sound field from the transition region of an axisymmetric body in water

Abstract: Understanding the physical features of the diffracted sound field on the surface of an axisymmetric body is important for predicting the self-noise of a sonar mounted on an underwater platform. The diffracted sound field from the transition region of an axisymmetric body was calculated by the geometrical theory of diffraction. The diffraction ray between the source point and the receiving point on the surface of an axisymmetric body was calculated by using the dynamic programming method. Based on the diffracte… Show more

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Cited by 5 publications
(4 citation statements)
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“…The flow noise is one of the main interference backgrounds that limits the performance of sonar mounted on an underwater platform; it reduces the signal-to-noise ratio of sonar and shortens the sonar detection range. In addition, it will radiate as a target sound source to a distant place [4,5]. Due to the actual oceanic environment being very complex, such as existing surface sea waves, ocean currents, and other disturbance factors, disturbance factors will cause an angle of attack between the axis of the axisymmetric body and its motion direction, and they could also lead to the motion speed of the axisymmetric body to be time-varying [6,7].…”
Section: Introductionmentioning
confidence: 99%
“…The flow noise is one of the main interference backgrounds that limits the performance of sonar mounted on an underwater platform; it reduces the signal-to-noise ratio of sonar and shortens the sonar detection range. In addition, it will radiate as a target sound source to a distant place [4,5]. Due to the actual oceanic environment being very complex, such as existing surface sea waves, ocean currents, and other disturbance factors, disturbance factors will cause an angle of attack between the axis of the axisymmetric body and its motion direction, and they could also lead to the motion speed of the axisymmetric body to be time-varying [6,7].…”
Section: Introductionmentioning
confidence: 99%
“…As is well known, dynamic programming is a very useful tool in solving optimal control problems. [11] However, due to the difficulties related to solving the time-varying Hamilton-Jacobi-Bellman (HJB) equations, the closed-loop optimal feedback control can hardly be obtained. Approximate optimal solutions of the optimal problem have consequently attracted much attention.…”
Section: Introductionmentioning
confidence: 99%
“…A parameter study was done to indicate the features of surface-duct propagation. This paper is also devoted to a parameter study of the surface duct but the aim is to present explicit expressions for describing the effects of the geometry parameters of sonar [11,12] on its performance. As the requirement for the detection range of the sonar system increases, the working frequency decreases.…”
Section: Introductionmentioning
confidence: 99%