Water surface aircraft seakeeping test constant force unloading device and method

Abstract

The invention belongs to the field of water surface aircraft seakeeping tests, and provides a water surface aircraft seakeeping test constant force unloading device and method. The constant force unloading device comprises a trailer measuring bridge, a navigation rod, a model, a navigation piece, an angle sensor, a resistance sensor, a limiting guide rail, a heaving rod, a remote control electrichoist, a displacement sensor, an overload sensor, a fixed frame, a fixed pulley, a movable pulley, a tension sensor, a linear sliding rail, a sliding block, a spring, a Kevlar rope and a rocker. A relatively constant simulated aerodynamic lift force can be provided for a full-aircraft unpowered model and a single-hull model seakeeping test of a water surface aircraft; a test technical method withhigher reliability and more accurate model test data are provided for real seakeeping prediction of the water surface aircraft, quick and efficient test verification is performed on feasibility of a water surface aircraft seakeeping design scheme, and technical guarantee is provided for seakeeping design and research of the water surface aircraft.

Description

technical field [0001] The invention belongs to the field of water surface aircraft seakeeping test, in particular to a constant force unloading device and method for water surface aircraft seakeeping test. Background technique [0002] In the prior art, the following three methods are commonly used for aerodynamic compensation in the seakeeping test research process of the single-hull model and the whole aircraft unpowered model: weight deduction method, suspended weight method and elastic buffer method. [0003] The weight deduction method refers to the method of adjusting the load to the actual load minus the aerodynamic lift compensation as the test model load to realize aerodynamic compensation and constant force unloading during the preparation of the model test. When this method encounters wave impact, the motion state of the model is more likely to change due to the decrease in load. After the impact, the vertical acceleration of the model increases due to the decrea...

AI Technical Summary

Problems solved by technology

The existence of the former form can effectively buffer the change of model unloading caused by the sudden change of the acceleration of the hanging weight during the heaving motion of the model, but it cannot solve the problem in essence. When the model responds violently, the effect is the same as that of the hanging weight method

In order to achieve the effect of constant force unloading in the latter form, the elastic coefficient of the elastic rope is required to be relatively small, and the large deformation of the elastic rope can still ensure that the tension change of the elastic rope is small, which meets the test requirements of constant force unloading, but the elastic rope The initial drawstring length needs to be very long, which cannot be achieved during the test

Therefore, this method is feasible in theory, but it is not feasible in the actual operation process, and it cannot realize constant force unloading that meets the requirements of seakeeping test research.

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