This dissertation is devoted to the study of vibration and radiation of combined structures with cylindrical shells . the main contributions are as follows : 1 . three problems emerged from traditional study of mobilities are pointed out 指出了传统导纳研究中经常忽视的三点问题：局限于点的研究；忽视激励的分布形式；忽视“结构的传递点导纳远小于结构的输入点导纳”这一结论提出的前提条件。
