Abstract：Based on the overview of the error correlation theory and the draft survey method, the error propagation law of the draft survey were analyzed. By reading a large number of documents to sort out the systematic errors in the weight measurement process, in many errors, the systematic error caused by the vertical component of the anchor chain and the cable has not been effectively corrected. Based on the JTS144-1-2010 "Port Engineering Load Specification"(hereinafter referred to as specifications) and the existing research results, the lateral and longitudinal component forces of ship wind pressure and water flow force are analyzed and obtained. The horizontal external force of the hull (i.e., the reaction force of the horizontal tension component of the anchor chain) were combined with the mechanical principle and the anchoring state of the ship to establish a calculation model of the vertical component of the anchor tension, which can be used to solve the correction of systematic error caused by the vertical component of anchor chain. The example showed that when the wind speed is 13m/s and the flow rate reaches 4kn (1kn=1.852km/h), only this error has reached 28% of the allowable error of the water gauge.
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2021, Vol. 42 
