An iterative approach for modal analysis of solid rocket motor incorporating frequency dependent modulus  

作　　者：Muhammad Adnan SUN Bing ZHANG Jian-wei Sarosh Ali 

机构地区：[1]School of Astronautics,Beijing University of Aeronautics and Astronautics

出　　处：《航空动力学报》2013年第2期452-458,共7页Journal of Aerospace Power

摘　　要：The modulus of viscoelastic materials varies with excitation frequency.However,during modal analysis of frequency dependent materials,a material evaluation frequency is necessary because stiffness cannot be modified during eigenfrequency procedure.As a result,only those vibration modes are accurate,of which eigenfrequency is close to the material evaluation frequency.In order to obtain vibration modes of solid rocket motor(SRM) using material modulus based on frequency which is the same as the eigenfrequency,an iterative approach was proposed.Results of the iterative technique show that frequency modes obtained from the method are in complete agreement with the eigenfrequency and material evaluation frequency.The modulus of viscoelastic materials varies with excitation frequency.However,during modal analysis of frequency dependent materials,a material evaluation frequency is necessary because stiffness cannot be modified during eigenfrequency procedure.As a result,only those vibration modes are accurate,of which eigenfrequency is close to the material evaluation frequency.In order to obtain vibration modes of solid rocket motor（SRM） using material modulus based on frequency which is the same as the eigenfrequency,an iterative approach was proposed.Results of the iterative technique show that frequency modes obtained from the method are in complete agreement with the eigenfrequency and material evaluation frequency.

关 键 词：solid rocket motor viscoelastic materials modal analysis EIGENFREQUENCY frequency dependent modulus 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]