At first , some advances in the research of dynamic response of cylindrical shells and conical shells are reviewed , and those approaches for studying such kind of problems are summarized here as well . the main objects studied in this paper are the transient response of cylindrical shells under longitudinal line - loading and that of conical shells under cosinoidal impulsive loading 首先回顾总结了圆柱壳和圆锥壳动力响应的研究进展情况，并简单归纳了该类问题研究的方法，确定了本文的研究对象主要是纵向线载荷作用下的圆柱壳瞬态响应和余弦冲击载荷作用下的圆锥壳瞬态响应。
We propose in this paper an evaluation method for the transient performance of das , through the period signal , by utilizing the much smaller difference than sampling period between the multi - periods of signal and the multi - sampling periods , getting shorter equivalent sampling period ( i . e . higher equivalent sampling rate ) , which is derived from input signal period and sampling period , and then , the problem that how to get the transient performance of das has been solved . the transfer function of das is then evaluated and identified , and practical test results are also presented 本文介绍一种方法，通过对其加载特定的周期性输入信号，使用采样周期的整数倍和信号周期整数倍间的微小偏差，获得比实际采样周期小得多的等效采样周期，从而解决了数据采集系统瞬态响应特性的获取问题；并进而获得了数据采集系统传递函数的辨识和评价结果，实现了数据采集系统瞬态特性的总体评价。
In this dissertation , in allusion to the limit that the domestic analysis and studies of the body structure only concentrate on the static bend , torsion and some extreme conditions in nowadays and the studies on transient analysis of the whole vehicle that contains the suspension model , tire model and the road model are few , the applications of the fem on the analysis of the car body structure are studied . and in this dissertation the method of building connecting means models , the dynamic response of the body , the fatigue analysis of the body and the reforming measures of the body are deeply discusses 本论文针对目前国内车身结构分析的研究只限于对车身或车架结构在静态扭转、弯曲载荷以及几种极限工况载荷作用等几种情况的研究,对含有悬架、轮胎以及路面模型的整车瞬态响应分析的研究较少的实际情况,对有限元方法在汽车结构分析中的应用作了些研究工作,尤其是在车身连接件处理、车身动态响应、车身疲劳强度分析、车身结构改进方案等方面进行了较深入的探索。
Simulation results show that the surge line moved up - left relative to the original one and surge margin became larger when wet compression is used , which means wet compression can extend steady - operation regions of compressors and the si a - 02 gas turbine . at last , based on the moore - greitzer model surge and rotating stall of a compression system with wet compression is modeled with consideration of inlet evaporative cooling and compressor pressure rise when wet compression is used 哈尔滨工程大学博士学位论文最后，本文在压缩系统moors grei上zer模型的基础上，考虑进口蒸发冷却的作用和压气机湿压缩过程的作用，推导出了湿压缩系统喘振和旋转失速的统一模型，该模型可以模拟系统发生喘振和旋转失速时的瞬态响应以及喷水湿压缩对系统瞬态响应的影响。
Introducing the theory and application of boundary element method on the sound radiation , giving the process of solving vibration noise radiation problem using boundary element analysis software ; presenting the coupling theory and the combination analysis of finite element method and boundary element method , and doing relevant analysis based on close drum shell ; programming the noise data simulation program using the numerical calculation software , simulating the acoustic and pressure data of a key point in the transient response acoustic field of the close drum shell , realizing the audibility of the noise , using the virtual reality tools to simulate the vibration noise of the drum shell ; combining the finite element method and boundary element method to analyze the vibration noise radiation of some gear box , and completing the whole simulation process of the vibration noise of the gear box 综合介绍了边界元法在声辐射问题上的理论及应用；并给出了运用边界元法分析软件求解振动声辐射问题的过程。阐述了有限元法和边界元法的耦合理论及组合分析方法，并以封闭鼓形薄壳为分析对象进行了相应的分析。利用数字计算软件编制了噪声数据模拟程序，并模拟了通过组合方法分析封闭鼓形薄壳瞬态响应声场而获得一关键点的声压数据，实现声音的可听化，随后通过虚拟现实工具实现了该情形下椭球壳振动噪声的虚拟仿真。
A static and a transient analysis of an embedded crack in a long elastic strip are carried out . the results are approximate to the ones that existed . and the effects of the factors including the crack configuration , the crack depth , the strip length and the strip thickness on the transient response are discussed 对含内埋椭圆裂纹的板条进行了静态和瞬态分析，得到的结果与已有的解吻合良好，对影响瞬态响应的因素如裂纹形状、裂纹深度、板条长度、板条厚度做了分析比较。
