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。
The precious method to simulate earthquake accelerations is not perfect because the points on the interface still move according to the simulated acceleration when the points " motion ends , which is obviously a paradox . if the points " velocity is not zeroized , soil ' s damage value based on shear stress ' s peaks or extrema is overestimated in multi - point input analysis . the new method ' s rationality is analyzed 以往人工合成的地震波在地震结束时即地震加速度恒为零时速度不为零,这与合成地震动是“模拟输入点从静止到运动再到静止的运动过程”这一要求不一致,同时导致时域内多点输入分析时差动力过大以至算出的损伤值过大,于是本文提出了简易的地震动速度归零化方法并分析了其合理性。
输入: import点: drop黄金输入点: import gold point; import specie point; importing gold point禁止输入点: inhibitory input point; inhibitory input-point现金输入点: import species point硬币输入点: importing specie point从文件输入点: points from a file入点: in进口黄金点, 黄金输入点: import gold point其他输入点是否可以接24: vdc异步入口点, 异步输入点: asynchronous entry point把入点: mark in插入点: i ertion point; insertion point代入点: substitute point挂入点: mount point接入点: a access point; aaccess point; pop进入点: entry point; point of entry; point, entry; point; initial馈入点: point radix; point, load切入点: beginning-point; entrypoint; feeding-in point; point of penetration breakthrough point; point of penetration; breakthrough point侵入点: p of e引入点: calling station; entrance point; lead in point再入点: reentry point针入点: penetration重入点: point restart; point, reentry; reentry point; rescue point; restart point注入点: decanting point