【摘要】 为改进螺栓连接结构的定频试验方法，对国际上标准的Brake-Reu?螺栓连接梁结构的非线性振动特性进行试验研究，精确测量结构在每个频率下激励与响应之间的非线性关系，重构恒力条件下的非线性幅频及相频特性曲线，分析不同激励水平及不同拧紧力矩条件下结构非线性振动响应的变化规律。该方法无需反馈控制，简便快捷，可以克服扫频过程中力跌落引起的测量误差，精确测量非线性结构激励与响应之间的幅值和相位关系，可为结构的非线性建模仿真提供精确的参考数据，有助于深入认识结构的非线性振动特性。更多还原

【Abstract】 Introduces an improved fixed frequency test method of bolted joint structures. The nonlinear vibration characteristics of the benchmark of Brake-Reu? beams are tested and studied, the nonlinear relationship between excitation and response at each frequency is accurately measured, the curves of the nonlinear amplitude and phase characteristic under constant forces are reconstructed, and the evolution of nonlinear vibration responses under the different excitation levels and different tightening torques is analyzed. The improved method, simple and fast with no need of feedback control, can overcome the measurement error caused by the force drop-out in the swept frequency test and measure nonlinear vibration accurately, which provides effective reference data for the modeling and simulation of fastnonlinear structures and is of help to understand the nonlinear vibration characteristics of the structure.更多还原