Showing 3 results for Model Test
Behnam Sadeghzadeh Parapari, Mohamad Saed Seif, Hamid Mahdigholi ,
Volume 7, Issue 14 (3-2012)
Abstract
In recent years, unmanned vehicles have intensively been developed to reduce human dangers for marine applications. Predicting the hydrodynamic coefficients of an autonomous underwater vehicle is important during the vehicle’s design phase. In other words to design an AUV, one must clarify its maneuverability and controllability based on a mathematical model. The mathematical model contains various hydrodynamic forces and moments expressed collectively in terms of hydrodynamic coefficients. Therefore, the correct values of the coefficients must be known to precisely design the controller of AUVs.
Despite of remarkable progress in numerical analysis in recent years, But the experimental methods test modes is still more reliable. No marine vehicle will be manufactured unless its model been tested clearly first.
SUT-2 is an AUV, being developed by Marine Engineering Research Center Sharif University of Technology in Iran. Model test done into marine engineering laboratory towing tank.
In this paper hydrodynamic coefficients calculated with model test of autonomous underwater vehicle and hydrodynamic forces analyzed. This coefficients are used for dynamic modeling and autonomous controller design
Mohammad Saeid Seif, Mohammad Reza Tabeshpour,
Volume 11, Issue 21 (9-2015)
Abstract
Tension leg platform is a compliant structure with vertical moorings and added buoyancy force. In this paper, effective parameters on experimental modeling of TLPs have been investigat. experimental modeling with correct scale factor has been done in Sharif University of Technology marine engineering laboratory test basin. deep water simulation capability were discussed and finally the model, launched in the basin. Pretension modeling is another conceptual component that could be easily analyzed.Ultimately Sea keeping results of ISSC TLP model duo to the regular laboratory waves with different heading angles and two amplitudes were extracted. The main purpose is ISSC TLP frequency response and surge beating analysis by model testing.
Majid Askary Sayar, Abolfath Askarian Khob, Karim Akbari Vakil Abadi, Hassan Ghassemi,
Volume 16, Issue 31 (4-2020)
Abstract
This paper investigates the heave and pitch motion responses of an inverted bow hull. The experimental data were obtained from seakeeping tests with two scaled models of reference fishing vessel NA8-14 BSRA. The bow shape of the models is redesigned by inverted shape in two angles of 45 and 60 degrees. Several tests were conducted on the models at different speeds of 0.6, 0.9, and 1.2.m/s. Generated waves in the towing tank are of the regular type with the wavelength changing from 0.6L to 1.6L by an increment of 0.2L m. The amplitude of the waves was equal to either 35 mm. The heave and pitch response amplitude operator (RAO) versus no dimensional frequencies are presented. The investigations demonstrated that by decreasing inversion angle of bow to 45 degrees motions of the model improved. The results also showed that the interactions between the motions responses leads to the frequent appearance of “Kinks” in a coupled form with the responses of other motions
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