共查询到20条相似文献,搜索用时 140 毫秒
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针对某型齿轮箱,提出一种基于声学贡献度分析的减振降噪设计方法.建立了齿轮箱有限元模型,计算其结构模态.将齿轮箱有限元网格作为结构网格和声学边界网格,在LMS Virtual.Lab下用边界元法求解真实工况激励下的辐射声场.利用声学贡献度分析,找到贡献度最大的面板,修改其设计参数.修改结构后,声场中某点噪声峰值降低8.2... 相似文献
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针对发动机辐射噪声问题展开研究,应用有限元法对某发动机进行模态计算,然后基于模态声传递向量(Model acoustic transfer vector,MATV)技术与边界元法,计算得到发动机的辐射噪声响应,并计算得到其噪声传递函数。基于此,对发动机机体辐射噪声进行传递路径分析。本文将有限元方法中的噪声响应计算应用到了发动机的噪声预估中,对发动机的振动噪声控制具有一定的学术价值以及工程意义。 相似文献
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以升船机同步系统用弧齿锥齿轮箱为研究对象,综合考虑锥齿轮副刚度激励、误差激励和啮合冲击激励等内部动态激励,建立了包含弧齿锥齿轮副、传动轴、轴承和箱体等的齿轮系统动力有限元模型,采用ANSYS对齿轮系统进行动态响应分析,得到齿轮箱的振动位移、振动速度及振动加速度;以箱体表面节点振动位移为边界激励条件,在SYSNOISE中建立箱体声学边界元模型,采用直接边界元法进行辐射噪声预估,得出箱体表面的声压云图及场点的辐射噪声。结果表明:齿轮箱动态响应及辐射噪声的峰值频率均出现在啮合频率及其倍频处。 相似文献
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基于SYSNOISE的轴流式风机管道噪声辐射仿真分析 总被引:2,自引:0,他引:2
结合有限元法和边界元法,对某火电厂轴流式风机的本体及进/出气管道进行了声一振仿真,分析其声辐射场的特点。首先,用Pro/E软件建立风机进/出气和本体管道的三维实体模型,并用ANSYS进行网格划分后再导入SYSNOISE中建立其声场分析的边界元模型。其次,在400~700Hz范围内进行结构有限元谐响应分析,得到管道表面振动速度作为边界元分析的边界条件。最后,采用间接边界元法计算场点声辐射强度,仿真结果分析表明:在650Hz附近的声压最大;各场点的转折频率接近;不同场点的声压随频率的变化趋势基本相同。 相似文献
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论述了边界元法用于含有相变的三维瞬态温度场分析中的理论;详细推导了边界元法用于计算中的公式:对高斯积分计算、时间步长选取及其对计算精度的影响进行了深入的研究;还讨论了多种材料的耦合分析以及相变潜热释放等问题。根据自编的三维瞬态温度场边界元法分析程序所做的数值验证,以及和有限元法计算对比的结果表明:在三维瞬态温度场计算中,边界元法不仅是有效的,而且可以比有限元法得到更好的效果。 相似文献
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Liang Xinhua Zhu Ping Lin Zhongqin Zhang Yan 《Frontiers of Mechanical Engineering in China》2007,2(1):99-103
A lightweight automotive prototype using alternative materials and gauge thickness is studied by a numerical method. The noise,
vibration, and harshness (NVH) performance is the main target of this study. In the range of 1–150 Hz, the frequency response
function (FRF) of the body structure is calculated by a finite element method (FEM) to get the dynamic behavior of the auto-body
structure. The pressure response of the interior acoustic domain is solved by a boundary element method (BEM). To find the
most contributing panel to the inner sound pressure, the panel acoustic contribution analysis (PACA) is performed. Finally,
the most contributing panel is located and the resulting structural optimization is found to be more efficient.
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Translated from Journal of Shanghai Jiaotong University, 2006, 40(1): 177–180 [译自: 上海交通大学学报] 相似文献
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为有效解决车身制造问题,提出了利用实例推理技术构建面向车身制造问题的决策支持系统,在集成车身制造各知识模型的基础上,引入公理设计原理,建立故障诊断和分析的推理机制,较好地解决了系统知识库构建效率和方案生成过程中的准确性问题,并以生产实例说明了系统的工作原理。 相似文献
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针对局部灵敏度分析方法不能考虑参数的概率分布、不能适用参数大范围变化及分析各参数之间交互作用等局限,将Sobol’全局灵敏度分析法引入到汽车噪声传递函数的灵敏度分析中。Sobol’法将函数f(x)分解成2n项递增项之和,通过采样计算模型响应的总方差及各偏方差,以求得灵敏度,从而有效避免了局部灵敏度分析方法的缺陷。以某型轿车为例,在建立声固耦合有限元模型的基础上,计算出从悬置点到驾驶员右耳处的车身噪声传递函数,并运用Sobol’法分析出相关板件厚度的一阶全局灵敏度及总体全局灵敏度值,从而甄别出对驾驶员耳旁声压单独影响较大或交互作用显著的板件,为车身噪声传递函数的优化工作提供指导。应用实例验证了该方法的有效性。 相似文献
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Acoustic-structure sensitivity is used to predict the change of acoustic pressure when a structure design variable is changed.
The sensitivity is significant for reducing noise of structure. Using FEM (finite element method) and BEM (boundary element
method) acoustic-structure sensitivity was formulated and presented. The dynamic response and response velocity sensitivity
with respect to structure design variable were carried out by using structural FEM, the acoustic response and acoustic pressure
sensitivity with respect to structure velocity were carried out by using acoustic BEM. Then, acoustic-structure sensitivity
was computed by linking velocity sensitivity in FEM and acoustic sensitivity in BEM. This method was applied to an empty box
as an example. Acoustic pressure sensitivity with respect to structure thickness achieved in frequency ranges 1–100 Hz, and
its change rule along with stimulating frequency and design variable were analyzed. Results show that acoustic-structure sensitivity
method linked with FEM and BEM is effective and correct.
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Translated from Journal of Vibration Engineering, 2005, 18(3): 366–370 [译自: 振动工程学报] 相似文献
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Madhusoodanan Mannoor Jeeseong Hwang Sangmo Kang 《Journal of Mechanical Science and Technology》2018,32(12):5671-5683
We have numerically studied the geometrical effects on the performance of an H-type cylindrical resonant photoacoustic cell, composed of one resonator and two symmetrical buffer cylinders, by performing simulations on the generation of acoustic waves in the cell. Here, the acoustic response (pressure), resonance frequency and quality factor are calculated for the cell performance, while the lengths and diameters of both resonator and buffer cylinders are considered for the geometrical parameters or dimensions. Our calculation solves linearized forms of the continuity equation, Navier-Stokes equation, energy equation, and equation of state using a finite element method under an assumption that the heat addition due to the laser passage and thus the variations in the velocity, pressure and temperature fields inside the cell are small enough. First, we performed a statistical analysis using a design of experiment method to evaluate the relative impacts of the cell dimensions on the acoustic response. Subsequently, we performed a parametric study to quantify the cell performance with the dimensional variations. Our results, along with the response surface methodology, provide guidance for a systematic design optimization of the cell for the best acoustic response. The approach in this study may be applied to the design of various types of resonant photoacoustic spectroscopy devices. 相似文献
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Mohamed Slim Abbes Slim Bouaziz Fakher Chaari Mohamed Maatar Mohamed Haddar 《International Journal of Mechanical Sciences》2008,50(3):569-577
Gearbox power transmissions are widely used in the automotive industry. They have a complex vibro-acoustic behaviour that is influenced by the various acoustic–structural interaction mechanisms. This paper concentrates on modelling these systems using a three-dimensional finite-element (FE) approach for the structure combined with a Rayleigh integral (RI) method for the acoustic radiation process. A modal analysis method is used to evaluate the elasto-acoustic modal characteristics for the coupled system. Effect of the fluid inside the gearbox on the vibration response is discussed. The combined use of this FE/RI model enables evaluation of the acoustic response. A case study of a simplified gearbox internally excited with gear mesh stiffness fluctuation is presented. Vibratory analysis allows concluding that the vibro-acoustic coupling between elastic housing, air-cavity and free acoustic field have not to be neglected. 相似文献
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Coupled finite element analysis of MIG welding assembly on auto-body high-strength steel panel and door hinge 总被引:2,自引:2,他引:0
Wen-feng Zhu Chun Xu Lu Zeng 《The International Journal of Advanced Manufacturing Technology》2010,51(5-8):551-559
Automotive doors are assembled to auto-body side-frame through hinges by metal inertial gas arc-welding process. Because of thermal effect, the after-welding geometrical deformation of hinges seriously affects assembly accuracy of door position, causing functional problems such as poor sealing, abnormal sound during closing and opening, as well as large residual stress. In order to solve the complexity involved in auto-body arc-welding assembly process due to dynamic coupling between temperature field and structural field, a multi-field coupling finite element method employing the subroutine of commercial code ANSYS-APDL is proposed, and numerical analysis model is established in quantitative detail. Focusing on the arc-welding assembly process for the auto-body plate (which uses high-strength hot-dip galvanized steel), the promising lightweight material, and door hinge (which uses conventional low-carbon steel), moving heating source and birth–death element method are both adopted in this thermal–structural coupling analysis in order to obtain the complicated transient temperature distribution and mechanical stress behavior during the sequential formulation of arc-welding seam. Experiment is carried out to confirm the validity of this newly developed method, including temperature measurement by thermocouple and residual stress test by X-ray diffraction. The agreement between the experimental and numerical results is satisfactory, indicating the reasonability and feasibility of this method in lightweight auto-body assembly research. It can be concluded that the moving heating source multi-field coupling arc-welding model can strongly support the process parameters optimization for obtaining minimum weld deformation and residual stress. 相似文献