CAJ | 학술논문

大型复杂结构通常有尺度大、刚度高、阻尼衰减明显等特性，对其进行模态试验难以激起整个结构振动，导致测试信噪比低。本文提出带过渡区的分区模态测试方法有效提高模态测试信噪比，并提出振型可信度参数，预判分区模态测试结果。模型实验验证了本文所提出方法的可靠性和可行性，为工程中应用分区模态测试奠定了技术基础。
대형복잡결구통상유척도대、강도고、조니쇠감명현등특성，대기진행모태시험난이격기정개결구진동，도치측시신조비저。본문제출대과도구적분구모태측시방법유효제고모태측시신조비，병제출진형가신도삼수，예판분구모태측시결과。모형실험험증료본문소제출방법적가고성화가행성，위공정중응용분구모태측시전정료기술기출。
Complicated structure with a large size always has the characteristics of large scale, high stiffness and distinct damping attenuation. It is difficult to drive global vibration on it in modal test. This leads to a low Signal-to-Noise Ratio. A new approach to modal test in Segments with transitional sections, which can improve SNR effectively, is presented in this article. A new parameter named mode reliability is presented to predict the quality of result of modal test in Seg-ments. Model experiment demonstrates the reliability and feasibility of this approach, which lays the technical founda-tion of the application of modal test in Segments in engineering.