Rigidity-adjustable type ship model sea load vertical bending moment measuring device

Abstract

The invention discloses a rigidity-adjustable type ship model sea load vertical bending moment measuring device comprising a round steel pipe. A left solid steel lever and a right solid steel lever are connected to the round tube in the radial direction of the round steel pipe in a rigid mode, wherein the two solid steel levers are symmetrical. The solid steel levers are provided with an upper steel sliding block and a lower sliding block in a penetrating mode, wherein the upper steel sliding block and the lower sliding block are symmetrical and can slide vertically along the solid steel levers. The left end of the round steel pipe and the right end of the round steel pipe are each in rigid connection with a flange plate. Two one-way strain gauges adhere to the upper surface and the lower surface of the round steel pipe in the length direction and are connected in a half-bridge bridge circuit mode. The rigidity-adjustable type ship model sea load vertical bending moment measuring device is suitable for ship model sea load tests with the inertia moment of the cross section changing within a certain range, accurate simulation of the inertia moment of the cross section of a ship model can be achieved, the inertia moments of all sections of a multi-section ship model can be different, the accuracy of a vertical wave bending moment test is improved, and the reliability of model test data is improved.

Description

technical field [0001] The invention relates to the technical field of ship model wave load testing, in particular to an adjustable stiffness type ship model wave load vertical bending moment measuring device. Background technique [0002] In ship wave load model tests, vertical bending moment is the most common measurement parameter. In previous model tests, a beam of uniform section arranged along the neutral axis of the midship cross section was often used for testing. This beam connects the various sections of the model, and at each section, the vertical bending moment is measured by pasting the upper and lower surfaces of the unidirectional strain gauges along the longitudinal direction of the beam. Such beams are usually processed with section steel, which can only simulate the stiffness of the midship cross-section, and the stiffness of other cross-sections has not been simulated. Although the load characteristics of the amidship section are the most important, othe...

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Problems solved by technology

Although the latter has greatly improved the simulation of the rigidity of the cross section compared with the former, it puts forward higher requirements for the selection of steel and the processing technology of steel, and some steel is difficult to find in the market

Another important problem is that the above two continuous beam measuring beams are only suitable for one ship model. After replacing a ship model, this kind of measuring beam can no longer be used due to the difference in cross-section rigidity, and needs to be redesigned and processed. A matching measuring beam will inevitably cause a serious waste of manpower, material resources and time

Another problem is that the size of the selected steel on the market is difficult to be exactly the same as the cross-sectional moment of inertia of the model. Accurate processing will undoubtedly require more manpower, material resources and time expenditures. If the cross-sectional stiffness of the beam and the ship model There is a deviation in the moment of inertia of the section, which is bound to have an important impact on the accuracy of the measurement results of the model test

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