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在舵结构的地面模态试验中,非线性因素对测试结果有很大影响。影响舵面的非线性因素也主要表现为间隙非线性。舵面结构由于在测试时往往处于上电上压状态,要求在测试过程中能在短时间内,得到舵面结构的收敛频率。目前最常用的舵面旋转频率测试方法为渐进加力法。然而,这种方法受激振力值及舵面强度的限制,很难在短时间内得到舵面的收敛频率。文章在渐进加力的基础上,采用加预载的方法来克服舵面的间隙,减小了测试过程中的最大力值,避免了舵面强度不够的影响,并且缩短了测试时间,提高了测试效率。
In the ground modal test of rudder structure, the nonlinear factors have a great influence on the test results. Non-linear factors that affect the rudder surface also mainly show the gap nonlinearity. The structure of the control surface is often in the power-on state during the test, which requires that the convergence frequency of the control surface structure can be obtained in a short time during the test. The most commonly used rudder rotational frequency test method is the progressive addition method. However, this method is limited by the exciting force value and the strength of the rudder surface, and it is difficult to obtain the convergence frequency of the rudder surface in a short time. On the basis of gradual application of force, the article adopts preloading method to overcome the clearance of the rudder surface, reduces the maximum force value in the test process, avoids the influence of insufficient strength of the rudder surface, shortens the test time and improves Test efficiency.