Resistance test device of experiment flat plate

Abstract

The invention relates to a resistance test device of an experiment flat plate. The test device comprises an experiment support, a dynamometer and an experiment flat plate which are up-down successively installed. The dynamometer is flexibly connected with the experiment support and the experiment flat plate. The width of the dynamometer is not less than the width of the experiment flat plate. The experiment flat plate is vertically hoisted, and the lower end part is immersed under the water surface. The guidance edge of the experiment flat plate is wedge-shaped. The dynamometer consist of an upper rigid beam, a lower rigid beam, a stress sheet and two elastic steel sheets installed on two ends of the upper and lower rigid beams. The elastic steel sheets are fastened on two ends of the upper and lower rigid beams through bolts. Stress sheets are arranged on the elastic steel sheets and are connected in a full bridge manner. According to the invention, adhesion resistance caused by the thickness of the test device and wave making resistance caused by the existence of the test device on the water surface are reduced; appendage resistance is avoided; and the elastic steel sheets can be replaced according to actual demands, so the proper range is ensured.

Description

technical field [0001] The invention relates to a flat plate resistance testing device for experiments, in particular to a testing device capable of accurately measuring the frictional resistance of flat plates with different roughnesses and different coatings in water. Background technique [0002] In the field of hull rapidity design, accurate testing of the frictional resistance of flat plates in water is the basis for calculating hull surface frictional resistance. In the experimental measurement, place the plate in still water to move at a certain speed, or place the plate in a water tank with a uniform, stable and definite flow rate, and measure the total resistance of the plate at this time. In the experiment, it is necessary to ensure that the direction of the water flow velocity is parallel to the plate. However, the frictional resistance is only a part of the actual measured total resistance, and other resistance components are also included, such as the viscous p...

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Problems solved by technology

[0003] Due to the small value of the frictional resistance in the experiment, it is very difficult to accurately measure the frictional resistance of the flat plate. The main influencing factors are as follows: First, other resistance components are inevitable in the experiment, even if the values ​​of other resistance components A very small force will also cause a large error; second, the dynamometer required for the experiment must have a small range and high precision, and there are few dynamometers that can meet the aforementioned requirements in the prior art; third, the vibration of the test frame in the experiment , tilt and buoyancy will affect the accuracy of the measurement results

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