The Design Of Floating Monitoring Platform And The Research Of Hydrodynamic Characteristics

Shallow water test is underwater production facilities and underwater operation technology to the deep development of the indispensable steps. For underwater production facilities and underwater operation condition monitoring is an important part of shallow water test. Underwater monitoring system after years of development, has taken many forms,function fulfillment. According to different main monitoring equipment carrier can be divided into fixed underwater monitoring equipment, floating underwater monitoring equipment,mobile underwater monitoring equipment, etc., according to the use requirements of the shallow water test field, this paper proposes a new floating underwater video monitoring equipment, and achieved with floating monitoring platform based on floating monitoring platform design, and the structural dynamic characteristics of floating monitoring platform,the hydrodynamics characteristic has carried on the related research.Floating platform equipped with underwater camera monitoring and other monitoring devices via underwater head of subsea production facilities and operations to monitor the situation, use a winch system to change the location of underwater head in the water to reach the different areas of equipment and operating conditions monitored. Floating to absorb the sea buoy monitoring platform design of mature experience, and combine the characteristics of the Spar platform to complete the design of a new type of floating monitoring platform,respectively the structure framework, winch system, selection of mooring line system design.After fulfilling the structure design of the related research of hydrostatic properties, on the center of gravity and buoyancy coordinate estimation, and the floating body section area moment calculation, and the floating monitoring platform under different Angle of high stability, restoring moment, curve of stability coefficient and static stability, dynamic stability curves, stability criterion.Selection of linear wave theory,the formula Morrison monitoring platform floating pontoon and wave loads suffered under the support column for the relevant calculations.Combined with ANSYS floating monitoring platform key parts,such as floating monitoring platform support and winch system, the analysis of its structural dynamics, including modal analysis and harmonic response analysis and transient dynamic analysis, analysis of the floating monitoring platform, the natural frequency of vibration under the action of waves and the harmonic response of the vibration deformation under the wave impact instantaneous deformation, its reliability is verified.Floating through the establishment of monitoring platform in wave motion mathematical model of approximate calculation out of the floating monitoring platform of inherent cycle of roll, pitch and heave inherent cycle, and use the AQWA module of ANSYS hydrodynamic performance of floating monitoring platform are analyzed in frequency domain and time domain simulation. In the frequency domain analysis suffered its first order wave forces,added mass force and damping force, and RAO response. By the time domain analysis of its real movement in response 200s.Through the model test tank test and monitoring platform floating in the water proof floating state meet the design requirements, to meet the needs of underwater video monitoring,the measured floating monitoring platform roll, pitch and free movement and attenuation curve when heave of anchor, by curve calculated its motion attenuation period, and finally through the rolling and pitching of the free movement of decay curves calculated, determined the elimination of the curve, and the curve is obtained by eliminating the roll and pitch damping.