2021 Vol. 16, No. 6
This paper briefly introduces particle image velocimetry (PIV) technology and summarizes the R&D of algorithms for velocity field calculation in the PIV image treatment. More attentions are paid to various applications of PIV in ship experimental test, and elaborate on them from three aspects, including the flow fields around surface ships and underwater vehicles, as well as ship air flow fields. Finally, the direction for the R&D of PIV technology in ship fields is put forward. In terms of the speed measurement hardware system, PIV algorithms and ship flow field research, several problems requiring further study are highlighted, suggestions on the measurement of ship flow field are given. This study has certain reference and guiding significance for future research on flow field performance optimization.
Launched from a sonobuoy tube and capable of autonomous flight, the autonomous sonobuoy frees the traditional sonobuoy from dependence on costly aerial delivery platforms. It can be installed on various small and medium-sized surface ships and unmanned vehicles to support the operational needs of long-distance and rapid situation awareness regarding underwater battlefields. By introducing the development of in-tube launch and sonobuoy technology, this paper proposes the design method of the autonomous sonobuoy and summarizes the key technologies of autonomous sonobuoy cluster operations, including cluster control, intelligent decision-making, network detection and so on. Furthermore, the combat patterns of autonomous sonobuoy clusters in wide-area cooperative detection, multi-source information support and evaluation assistance of combat effectiveness are analyzed. The results can provide references for the demand analysis, design and application of autonomous sonobuoy clusters.