共查询到19条相似文献,搜索用时 187 毫秒
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为了有效和快速地实现直线型超声电机的设计,提出了一种基于响应面法的直线超声电机优化设计方法并应用于蝶形直线型超声电机.响应面法是一种试验设计与数理统计相结合的优化方法.首先,利用有限元法建立定子的参数化模型并选定设计变量;其次,利用试验设计方法在变量空间里选取样本点,对各个样本点所对应的结构利用APDL建立有限元模型并进行模态分析和谐响应分析,得到对应各样本点的响应值,利用这些样本点和响应值建立定子响应面近似模型;最后,利用单纯形法找到最佳的设计方案.优化结果显示,蝶形直线超声电机的多方面设计要求都得以实现. 相似文献
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运用有限元方法对利用平面内弯曲模态超声电机定子进行了模态分析,获得了三种不同类型的面内振动模态,并讨论了电机结构参数对其模态频率的影响,在此基础上得到了一些有益的结论,为利用平面内旋转模态设计超声电机定子提供了理论依据。 相似文献
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为检验一种面内行波旋转超声电机定子结构动力学设计的优化设计方法,探讨了一类利用圆环面内弯振模态超声电机定子的模态试验方法.首先,分析了该面内行波旋转超声电机的工作原理;然后,基于有限元分析软件建立了电机的有限元模型,分析了其工作模态的特点;最后,结合PSV-300-B型激光扫描多普勒测振仪的测量原理,提出了通过测量圆环轴向振型识别该类型超声电机工作模态的测试方法.试验结果表明,该方法能够有效地检测出该面内行波旋转超声电机的工作模态,为利用圆环面内弯振模态的一类超声电机的模态试验和进一步优化设计提供了参考. 相似文献
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为识别一类纵振复合振动模式超声电机定子的工作模态,为优化定子动力学设计提供依据,提出通过局部振型相关分析识别电机定子的模态识别方法.首先,分析了纵振复合模态超声电机定子的工作模态,结合激光多普勒测振系统原理分析了面内振动模态识别的难点;其次,在电机定子动力学分析的基础上,提出了通过振子底端局部振型识别工作模态的方法;最... 相似文献
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利用ANSYS有限元软件建立斜齿式超声电机定子的有限元模型,并分析斜齿结构参数对定子振动模态的影响,得到了各结构参数对定子模态频率的影响曲线。研究结果表明,斜齿的结构参数对纵向振动模态频率的影响较小。 相似文献
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Air-bearings are installed between the stator and the mover of ultra-precision linear stages to suppress vibration and mechanical
contact. Spring-damping elements are used to emulate the complex interaction of the finite element model (FEM) developed in
this paper and the system dynamic behaviors are analyzed. Through the experimental modal test, the validity and reliability
of the model are proven. However, the dynamic characteristics including mode frequency, mode shape, and response amplitude
are obviously changed with the position of air-bearings. The combined optimization method is used to optimize the air-bearings
position. The best and worst positions are obtained using the dynamic characteristic analysis. The method can be generalized
to the connection position of different components in manufacture elements and to implement the system dynamic characteristics
optimization when the connection position can be changed. 相似文献
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Air-bearings are installed between the stator and the mover of ultra-precision linear stages to suppress vibration and mechanical contact. Spring-damping elements are used to emulate the complex interaction of the finite element model (FEM) developed in this paper and the system dynamic behaviors are analyzed. Through the experimental modal test, the validity and reliability of the model are proven. However, the dynamic characteristics including mode frequency, mode shape, and response amplitude are obviously changed with the position of air-bearings. The combined optimization method is used to optimize the air-bearings position. The best and worst positions are obtained using the dynamic characteristic analysis. The method can be generalized to the connection position of different components in manufacture elements and to implement the system dynamic characteristics optimization when the connection position can be changed. 相似文献
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在超声电机定子振动模态有限元分析的基础上,对结构模态截断,仅保留特定的模态,实现了模型降阶。用APDL实现了从有限元分析结果中自动提取特定的模态参数和相应等效电路模型的电学参数。仿真计算了定子的机械和电学响应,与实验数据对比表明,减缩的低阶运动模型保持了原系统的主要特性。 相似文献
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对地观测微小卫星主承力结构的优化设计与试验 总被引:1,自引:0,他引:1
为降低对地观测小卫星单机安装点加速度响应均方根值,提出了一种使加速度响应均方根值最小化的微小卫星主承力结构拓扑优化方法。首先对整星方案进行了有限元分析,分析显示整星Z向某些单机安装点的随机振动加速度响应均方根值过大。对系统进行了灵敏度分析,确定了卫星主承力结构底板是影响随机振动加速度响应均方根值大小的关键因素。以卫星单机安装点的加速度响应均方根值为目标函数,以体积作为优化的约束条件,应用连续体结构拓扑优化思想对卫星有限元模型进行拓扑优化设计,得到了一种单机安装点加速度响应均方根值满足指标要求的卫星主承力结构。最后,通过有限元分析与振动试验,证明了本文所设计的小卫星主承力结构力学性能参数均满足设计要求,其中整星的星敏感器、蓄电池、电源控制器等关键器件安装点的加速度响应均方根值相比优化前分别降低了23.3%、10.6%、11.3%,得到的结果验证了本文优化方法的有效性。 相似文献
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利用遗传算法和BP神经网络建立复杂结构系统动态优化的计算模型,该模型可代替系统原来的有限元模型,用于振动系统的快速重分析。首先对塔式起重机结构系统进行模态分析及谐响应动力学分析,找出对结构动态特性影响最大的模态频率,再利用灵敏度分析,确定对动态特性较敏感的设计变量作为神经网络的输入变量,并利用正交试验法确定神经网络训练样本,用有限元模型计算出样本点数据,建立反映结构振动特性的人工神经网络模型,最后利用遗传算法对所建立的神经网络模型寻优,得到使结构动态性能最优的设计参数。 相似文献
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A. A. Nuraini A. K. A. Mohd Ihsan M. J. M. Nor N. Jamaluddin 《Journal of Mechanical Science and Technology》2012,26(8):2405-2411
This paper presents the results of vibro-acoustic modeling and simulation using the finite element and the boundary element methods for the free piston engine structure. A model of the engine was constructed through the use of finite element software to perform a normal mode analysis of the engine structure. The objective was to determine the mode shapes and the natural frequency that contribute to engine structure vibration. Theoretical development of the engine balance motion and frequency response was also conducted. From the simulation and finite element analysis, the force response pattern of the engine vibration was determined and then compared with its natural frequency. The vibration data were used as the input data for noise analysis using the boundary element method. The integration of the finite element and the boundary element determined the noise-frequency data of the engine structure toward the occurrence of engine noise. The information can be used by designers to analyze engine specifications and structure, especially at the preliminary design stage. 相似文献
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