Error Processing Techniques of Integral Velocity Based on Frequency Spectrum Forecasting

2014 ◽  
Vol 511-512 ◽  
pp. 370-374
Author(s):  
Ai Guo Chen ◽  
Cheng Yong Wang ◽  
Jia Wei Ye
Keyword(s):  
Frequency Spectrum ◽  
Measurement Technique ◽  
Time Measurement ◽  
Error Processing ◽  
Offshore Platforms ◽  
Ship Wave ◽  
Velocity Error ◽  
Processing Techniques

The integral velocity error at the head end and the tail end of wave movement of ships or offshore platforms are too great. By improving the forecasting technique based on frequency spectrum, the integral velocity errors are maximally corrected and the wave movement of ships or offshore platforms is successful forecasted longer time ahead of time. Measurement technique of ship wave movement based on accelerometers array will be practically used.

scholarly journals ON THE RESULTS OF STUDYING THE INFLUENCY OF VIBRATION-FLUCTUATIONS PROCESSES ON THE RESOURCE OF WELDED JOINTS OF MARINE STATIONARY PLATFORMS FOR OIL, GAS AND OTHER USEFUL MINERALS ON THE SHELF

Akustika ◽  
2019 ◽  
Vol 34 ◽  
pp. 148-151
Author(s):  
Ivan Starokon
Keyword(s):  
Fluid Flow ◽  
Frequency Spectrum ◽  
Welded Joints ◽  
Natural Frequencies ◽  
Practical Importance ◽  
Offshore Platforms ◽  
Hydrodynamic Load ◽  
Great Practical Importance ◽  
Oil Gas

The study of the occurrence of resonant oscillations when the frequency spectrum from the hydrodynamic load coincides with the natural frequencies of the elements of the offshore platforms, as a result of which the acting stresses multiply, has a great practical importance. In the process of research it was found that the most loaded elements of the platform under such an impact are the supports. In this research, the degree of influence on the supports of the force arising due to the formation and breakdown of vortices during the flow around the supports with a fluid flow is estimated. A conclusion about the influence of vibrational-fluctuations processes on the resource of offshore stationary platforms is based on this research.

scholarly journals Time-stretched real-time measurement technique for ultrafast absorption variations with TS/s sampling-rate

2017 ◽  
Vol 25 (13) ◽  
pp. 14125
Author(s):  
Stefan Weber ◽  
Erik H. Waller ◽  
Christoph Kaiser ◽  
Georg von Freymann
Keyword(s):  
Real Time ◽  
Measurement Technique ◽  
Sampling Rate ◽  
Time Measurement ◽  
Real Time Measurement

scholarly journals INVESTIGATIONS OF VIBRO-OSCILLATORY PROVESSES OF THE SUPPORTS OF OFFSHORE STATIONARY PLATFORMS UNDER CONDITIONS OF ALTERNATING VORTEX FORMATION CAUSED BY THE INFLUENCE OF SEA CURRENTS

Akustika ◽  
2019 ◽  
Vol 32 ◽  
pp. 262-266
Author(s):  
Ivan Starokon ◽  
Y.M. Ovsannikov ◽  
A.O. Golovachev
Keyword(s):  
Frequency Spectrum ◽  
Characteristic Frequency ◽  
Natural Frequencies ◽  
Vortex Formation ◽  
Natural Oscillation ◽  
Hydrodynamic Forces ◽  
Offshore Platforms ◽  
Wide Range ◽  
Sea Currents ◽  
Oscillation Frequencies

Offshore platforms are exposed to hydrodynamic forces of a non-stationary nature and a wide range of frequencies. At present, hydrodynamic forces arising under conditions of alternating vortex formation have been poorly studied. These vortices are caused by the sea currents flowing around the supports of the platform, and due to their periodic occurrence and disruption, they lead to oscillations of the supports of the offshore platforms. Of particular danger are the cases of resonance of the characteristic frequency spectrum of hydrodynamic forces from the "occurrence-stalling" of vortices and natural frequencies of elements of the platform supports, which can cause fatigue damages in the platform supports. The article developed a method for determining the natural oscillation frequencies of marine supports and described the conditions under which the occurrence of alternating vortex formation is possible.

A direct time measurement technique for determining the longitudinal coordinate in thin-walled drift tubes

2014 ◽  
Vol 57 (5) ◽  
pp. 558-563 ◽  
Author(s):  
S. E. Vasilyev ◽  
A. M. Makankin ◽  
V. V. Myalkovskiy ◽  
V. D. Peshekhonov
Keyword(s):  
Measurement Technique ◽  
Time Measurement ◽  
Longitudinal Coordinate ◽  
Thin Walled
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