CAJ | 학술논문

针对工程中需要从火箭结构系统的整体模态中识别纵向模态，根据模态有效质量理论，提出了一种识别火箭结构系统纵向模态的自动辨识方法。以具有集中质量系统的振动特性作为算例，通过有限元软件，建立了具有集中质量系统的梁模型，利用自动辨识的方法，自动辨识出系统的纵向模态，并与应用模态分析法所计算的系统模态信息相比较，这种自动辨识方法不仅能准确的辨识出振动系统的纵向模态，而且还具有自动高效的识别特点。为准确快速建立液体火箭POGO振动系统的动力学模型等工程系统的模型提供理论依据。
침대공정중수요종화전결구계통적정체모태중식별종향모태，근거모태유효질량이론，제출료일충식별화전결구계통종향모태적자동변식방법。이구유집중질량계통적진동특성작위산례，통과유한원연건，건립료구유집중질량계통적량모형，이용자동변식적방법，자동변식출계통적종향모태，병여응용모태분석법소계산적계통모태신식상비교，저충자동변식방법불부능준학적변식출진동계통적종향모태，이차환구유자동고효적식별특점。위준학쾌속건립액체화전POGO진동계통적동역학모형등공정계통적모형제공이론의거。
Aiming at the problem that the longitudinal modes of structural system of rocket need to be identified from its integral modes in engineering,a method that automatically identifies the longitudinal modes of structural system of rocket was proposed according to the theory of modal effective mass.Taking the vibration characteristics of system with lumped mass as a computing example,applying the finite element software,the beam model of system with lumped mass was established,and the longitudinal modes of the system were automatically identified based on the method.Compared with the system modal information calculated by the method of modal analysis, this automatic identification method not only can accurately identify the longitudinal modes of vibrating system, but also has automatic and high efficiency identification feature.It provides a theoretical basis for the dynamic model of POGO vibrating system in liquid rockets and other model of engineering systems to be accurately and promptly established.