Abstract
Getting information from marine current requires that accurate and calibrated current meter is used. Current meter calibration is carried out in accordance with specific standard in calibration laboratories. To evaluate the performance and health of a current meter, one should compares velocity and heading it with a velocity and heading reference. In this paper, the innovative method for evaluate velocity and heading resulted from impeller marine current meter is presented. In this method, current meter is to be attached to buoy that is installed on it tow GNSS receivers; and by towing it in a lake, simultaneous velocity and heading of the current meter are recorded. Also data position of buoy by GNSS is recorded. Accurately calculated velocity and heading of buoy by using GNSS data to be used as a criterion to evaluate the current meter velocity and heading. Finally, the calibration equation that is known as the final result of the calibration process was determined for velocity and heading of current meter with reasonable accuracy. Also, current meter is tested in this paper evaluated commercial method in calibration laboratory. The results were compared with the results of the proposed method. The results indicated the success of the GNSS-based method for the Performance analysis of a marine current meter.
Highlights
Current metering and getting information from marine current velocity and direction are important and essential parameters in many industrial and research projects in the field of sea, and they needs to be used accurate and calibrated current meter
Current meter calibration usually is conducted in accordance with international standards in calibration laboratory that have their own advantages and disadvantages but in this paper, a new approach presented for marine current meter
Through connecting current meter to buoy equipped with GNSS receivers and Drag it into the lack, velocity and heading resulted from current meter were compared with velocity and heading of the buoy and calibration equation were presented for current meter
Summary
Current metering and getting information from marine current velocity and direction are important and essential parameters in many industrial and research projects in the field of sea, and they needs to be used accurate and calibrated current meter. Calibration of a current meter means experimental determination of the relationship between liquid velocity and the velocity directly indicated by the current meter. The final result of calibration of the current meter is expressed in the form of one or more equations of the straight lines as a best fit for the calibration curve. The innovative method for evaluate velocity and heading resulted from impeller marine current meter is presented. In this way the calibration equation for the velocity and heading of the current meter is determined
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