On problem of the determination of operational mode of towed line array with distorted shape

The distortion of the array shape is one of the main factors which result the performance degeneration from the ideal situation of towed line array (TLA). Based on the ordinary array shape distortion, the directivity function of TLA is presented in this paper. An algorithm for precisely determning the coordinates of each element by means of the inverse elliptic function is derived. A fast approximation of recursive formula for solving distorted array shape is given. According to the comparison between ideal directivity and the directivity of distorted array, the criterion for making decision of operational mode of TLA sonar is presented. So that the performance prediction problem in TLA is solved. The results of system simulation in computer show a good agreement with the theoretical analysis.

Management innovation and construction integration technology in Brazil’s superlarge deep-water offshore oil and gas unit project (FPSO P67/P70)

Designer:Design Institute of Offshore Oil Engineering Co.,Ltd.,China Construction Integrator:Offshore Oil Engineering Co.,Ltd.,China 1 Background and characteristics of Brazil FPSO P67/P70 project Floating Production Storage and Offloading(FPSO)is a comprehensive large-scale offshore oil and gas production unit that integrates oil and gas processing,oil storage and unloading,daily life,and power supply.