| 1. | Vibroacoustic analysis of a finite stiffened - cylindrical shell closed by circular plates
两端用圆板封口的环肋柱壳振动声辐射性能分析 |
| 2. | Thus a completely numerical compute analysis method is established in fluid about vibrational radiation efficiency at full frequency
从而建立一套圆柱壳体在流场中振动声辐射效率在全频段的数值计算分析方法。 |
| 3. | The main contents in this thesis are as following : 1 . the feedback control model of structure - acoustic system is established and brought into ‘ standard control framework ’ . 2
本文取得的主要新成果有: 1 .建立了结构振动声辐射反馈控制模型,并将其纳入控制理论中的“标准控制框架” 。 |
| 4. | Acoustics and vibration - laboratory measurement of vibro - acoustic transfer properties of resilient elements - part 3 : indirect method for determination of the dynamic stiffness of resilient supports for translatory motion
声学和振动.弹性元件的振动声传输特性的试验室测量.第3部分:平动用弹性支架动态劲度测定的间接方法 |
| 5. | The painting " retreat " not only gives one a unique perspective on a gorgeous , mysterious , serene and special mountain forest , but also allows the observer to almost hear the sound of branches and leaves happily vibrating in the fresh mountain breeze . .
的枝叶风动声闭关一画不但予人有艳玄清奇的山林的观感享受，更让欣赏者听到清风中枝叶欣然的振动声 |
| 6. | Using the speed response values of saw blades and workpiece calculated by the large - scale finite element analysis software ansys , the cutting noise of the disk saw machine is calculated and analyzed quantificationally in accordance with structural sound radiation theory
并用大型有限元结构分析软件ansys计算得到了单元速度值，根据结构振动声辐射理论，对圆盘锯机的锯切噪声进行了定量计算分析。 |
| 7. | Using finite element and boundary element method , a modal analysis model of complex structural acoustic radiation in light fluid is proposed for computing modal acoustic radiation frequency , farfield sound pressure , modal radiated acoustic power and acoustic radiation efficiency
摘要采用有限元和边界元方法建立了轻流体介质中复杂结构振动声辐射的模态分析模型，可计算结构的声辐射模态频率、模态场点声压、模态辐射声功率和声辐射效率等声场特性参数。 |
| 8. | 3 . under the conditions of sound velocity perturbation and the unmodel dynamic , active structure acoustic control system with robust h _ controller is simulated in this thesis . the performance of the robust h _ controller is compared with standard controller , the results show that the robust h _ controller possess famous robust performance
3 .对基于鲁棒h _控制理论的结构振动声辐射主动控制系统,在考虑流体声速摄动和未建模动态的影响下进行了仿真研究,同标称控制器的性能对比表明,鲁棒h _控制器具有令人满意的的稳定鲁棒和性能鲁棒性。 |
| 9. | A rectangular box simulating the axial box of the lathe tool is manufactured ; experimental measurements of the surface vibration on the rectangular box and the acoustic field around the rectangular box corresponding to firstly a series of a homogeneous excitation and secondly two iii independent white noise excitations are taken in a semi - anechoic chamber . taking the vibratory properties as input , the properties of the sound field are calculated by the evsbpm and the sdsbpm respectively . the effectiveness and reliability of the evsbpm and the sdsbpm for the calculation of acoustic radiation problem is further verified from the comparison of the calculated results and measured ones
第五章设计加工了一模拟机床主轴箱的长方箱体，在半消声室环境下，分别对其在单点处一系列简谐激励作用下和两点处的独立白噪声激励作用下的振动及其辐射声场进行了实验研究和分析计算，通过计算结果和实测值之间的比较，进一步验证了改进体积源边界合肥工业大学搏士学位论文点方法和统计分布源边界点方法计算振动声辐射问题的有效性和可靠性。 |
| 10. | 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。 |
