فهرست نشریات علمی دسترسی آزاد ایران

The techniques of modeling are a very powerful way to simulate offshore platforms. For situations where the numerical modelling of structure process is very complex, these methods are preferred, and the model cannot be expressed in precise mathematical formulas. Dynamic characteristics of the structure shall be taken into account in order to determine simulation specifications. In this article, two methods of distorted Froudian models and an equivalent single degree of freedom system were used to model the platform. In the distorted Froudian method, by allocating different scale coefficients for geometric features and other specifications, the problem of modeling members that suffer from problems such as unreality due to applying some scale coefficients (such as the thickness of tubular members) is solved. In the second method, due to the more significant effect of the first mode on the vibration of the system (more than 90% mass participation), the structure becomes an equivalent single degree of freedom model and the construction of the platform in the laboratory becomes very simple. The obtained results showed the excellent accuracy of both methods and the excellent efficiency of the equivalent system with an equivalent single degree of freedom in the specific conditions in this research.