1. China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
3. China Ship Scientific Research Center, Wuxi, Jiangsu 214082, China
4. Shandong Hydrologic Instrument Development Center, Weifang, Shandong 261031, China
Abstract：Towing tank usually measures its speed using a tachometer wheel, of which there is a systematic bias due to static calibration without considering dynamic characteristics. A dynamic calibration method of towing speed is introduced based on laser tracker. We firstly calibrate and correct the laser tracker on a long-rail speed facility, and then use it on the towing tank. Results show tachometer wheel with only static calibration has a lower indication, and the slower speed has the lower indication. It is better to use different encoder coefficients at different speeds. The uncertainty estimation method are also discussed, including the influence of towing speed stability and dynamic performance of the tachometer wheel.
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2019, Vol. 40 
