Device and method for measuring resistance and postures of ship module

Abstract

The invention relates to a device and method for measuring resistance and postures of a ship module. The device consists of an S-shaped resistance dynamometer, a trolling supporting rod, a guyed displacement measuring mechanism, a guide frame assembly and a band brake mechanism. When the device trolls a pool for measuring the resistance of the ship module, the device can also obtain a trim angle and the heaving postures of the head and the tail of the ship module, and resistance measuring under a stable speed condition of the ship module is realized by the interworking of the resistance dynamometer and the band brake mechanism; a wire is driven by the head and the tail of the ship module through utilizing the guyed displacement measuring mechanism, so that a corresponding voltage is outputted by a potentiometer, and a vertical displacement variation value of a bow and a vertical displacement variation value of a stern of the ship module are obtained through a straight-line relation; and a trim angle of the ship module, a heaving value of the ship module, the vertical displacement variation value of the bow and the vertical displacement variation value of the stern of the ship module are calculated; during trolling, the situation that the ship module moves freely in a vertical direction can be guaranteed by the guide frame mechanism, and the situations that a rolling cylinder is low in vertical sliding friction and free in vertical movement are guaranteed by utilizing a rolling shaft.

Description

technical field [0001] The invention relates to the technical field of ship model testing, in particular to a ship model resistance and attitude measuring device suitable for measuring parameters of a ship model resistance test in a rapid towing tank of a ship. Background technique [0002] The resistance test of the ship model by towing the tank is a routine method for the rapid test research of ships. Heave and pitch attitude are used to qualitatively and quantitatively analyze the influence of flight state changes on drag. The existing equipment for measuring the resistance test parameters of the ship model in the towing pool mainly includes the following types: one is to use a special equipment four-degree-of-freedom airworthiness instrument (capable of measuring the motion and resistance of surge, heave, pitch, and roll) , the main test objects are speedboats and multihull models with higher test speed and more obvious changes in navigation state. In addition to being ...

AI Technical Summary

Problems solved by technology

The existing equipment for measuring the resistance test parameters of the ship model in the towing pool mainly includes the following types: one is to use a special equipment four-degree-of-freedom airworthiness instrument (capable of measuring the motion and resistance of surge, heave, pitch, and roll) , the main test objects are speedboats and multihull models with higher test speed and more obvious changes in navigation state. In addition to being expensive, when using this device to measure conventional high-speed ship models, the degree of constraint freedom is slightly larger (for In terms of rapid research), the resistance test data measured under this constraint will produce a slight error. Another measurement device is to use imported special resistance meters to measure the resistance of the ship model, and the common rod displacement is arranged at the bow and tail of the ship model. Sensors or non-contact optical detection devices can obtain the heave and pitch angle information of the ship model by measuring the displacement of the bow and stern of the ship model. The "arc" trimming movement of the ship model's head and tail, instead of the vertical "straight up and down" movement, may easily cause the heave rod and the bushing of the rod displacement sensor to get stuck, hindering the free movement of the ship model, resulting in inaccurate measurement Fore and stern displacement, there is also a non-contact optical detection and measurement mechanism with high measurement accuracy, but this device is expensive and inconvenient to install

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